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  • 201.
    Wang, Ge
    et al.
    China University of Petroleum, Beijing, China.
    Zhang, Qi
    China University of Petroleum, Beijing, China.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    McLellan, BC
    Kyoto University, Japan.
    Chen, Siyuan
    China University of Petroleum, Beijing, China.
    Li, Yan
    China University of Petroleum, Beijing, China.
    Tian, Yulu
    China University of Petroleum, Beijing, China.
    Study on the promotion impact of demand response on distributed PV penetration by using non-cooperative game theoretical analysis2017Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 185, nr 2, s. 1869-1878Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Promoting the penetration of distributed photovoltaic systems (PV) at the end-user side is an important and urgent task. This study aims to evaluate the promotion impact of the response capability of smart home consumers on the distributed PV penetration using non-cooperativegame theoretical analysis. In the analysis, the Nash equilibrium can be found for consumers with different levels of demand response capability in an electricity market with real-time pricing (RTP) mechanism under different PV installed capacities and battery capacities. As a case study, 5 levels of consumers' response capability, 32 combinations of PV installed capacities and battery capacities were analyzed and inter-compared using the developed model. The results show that: (i) the consumers with higher response capability are able to accept larger PV capacity because the marginal revenue of new installed PV for smart consumers decreases much more slowly compared to that of a common consumer; (ii) the consumers with higher response capability need less batteries to promote PV economic acceptability; (iii) the consumers with higher responsecapability can meet the electricity demand in real-time with least expenditure, so they get more ultimate benefit from the games.

  • 202.
    Wang, Ge
    et al.
    China University of Petroleum-Beijing, China.
    Zhang, Qi
    China University of Petroleum-Beijing, China.
    Mclellan, Benjamin C.
    Kyoto University, Japan.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Multi-region optimal deployment of renewable energy considering different interregional transmission scenarios2016Ingår i: Energy Journal, ISSN 0195-6574, E-ISSN 1944-9089, Vol. 108, s. 108-118Artikel i tidskrift (Refereegranskat)
  • 203.
    Wang, Ge
    et al.
    China Univ Petr, Peoples R China.
    Zhang, Qi
    China Univ Petr, Peoples R China.
    Tian, Ruijie
    China Univ Petr, Peoples R China.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Combined Impacts of RTP and FIT on Optimal Management for a Residential Micro-Grid2015Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 75, s. 1666-1672Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Residential micro-grid can reduce the household's electricity expense as well as shift the electricity demand from peak time to valley time. Optimal management of a typical residential smart micro-grid is conducted using a proposed model in the present study. In the optimal management, the real-time pricing mechanism, feed-in-tariff for Photovoltaics (PV) power as residential electricity generators, and residential appliances are considered. Four scenarios are studied and the result shows that the real-time pricing mechanism shifts effectively the electricity consumption from time peak time to valley time, and different feed-in-tariff of Photovoltaic (PV) can shift the energy consumption of micro-grid between periods with strong solar irradiation and weak solar irradiation.

  • 204.
    Wang, L.
    et al.
    SINTEF Energy Research, Sem Saelends vei 11, Trondheim, Norway.
    Skreiberg, Ø.
    SINTEF Energy Research, Sem Saelends vei 11, Trondheim, Norway.
    Becidan, M.
    SINTEF Energy Research, Sem Saelends vei 11, Trondheim, Norway.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Sintering of rye straw ash and effect of additives2014Ingår i: Energy Procedia, 2014, s. 2008-2011Konferensbidrag (Refereegranskat)
    Abstract [en]

    The effects of kaolin and calcite additives on the rye straw ash sintering behaviors were investigated. The rye straw ash has a high sintering tendency, with observation of severe fusion during combustion. The formation and melting of potassium silicates play key roles in sintering of the rye straw ash at elevated temperatures. Fusion characteristics temperatures of the rye straw ash were significantly increased upon kaolin and calcite addition. Kaolin addition led to formation of high temperature melting potassium aluminum silicates, which were revealed by XRD analyses. Due to formation of high temperature melting species due to kaolin addition, the severe sintering of the rye straw ash was significantly reduced. Addition of calcite provided CaO to react with silica in the rye straw ash, causing generation of high temperature melting calcium rich silicates. In addition, the dilution effect from calcite is a main reason for improved rye straw sintering behaviors.

  • 205.
    Wang, L.
    et al.
    SINTEF Energy Research, Trondheim, Norway.
    Skreiberg, Ø.
    SINTEF Energy Research, Trondheim, Norway.
    Khalil, R.
    SINTEF Energy Research, Trondheim, Norway.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Effect of fuel mixing on melting behavior of spruce wood ash2019Ingår i: Energy Procedia, Elsevier Ltd , 2019, Vol. 158, s. 1342-1347Konferensbidrag (Refereegranskat)
    Abstract [en]

    The aim of this work was to investigate effects of fuel mixing on melting behavior of spruce wood ash. Spruce bark was studied as additive fuel regarding its ability to lower the melting and flowing temperature of spruce wood ash. Standard ash fusion characterization tests were carried out on ashes from mixtures of spruce wood and bark after heating at 550 °C. The ash residues after the ash fusion tests were analyzed by using scanning electron microscopy-energy dispersive X-ray spectrometry (SEM-EDX). High melting temperature and low sintering tendency of spruce wood ash was observed. It is mainly attributed to formation of calcium rich silicates with high melting temperatures. Upon mixing with 10 wt% bark, the melting temperature of the spruce wood ash considerably decreased, which flowed completely after the ash fusion test. Compared to spruce wood ash, SEM images showed that the ash from the mixture of spruce wood and bark passed a molten stage with formation of slag. SEM-EDX revealed that the concentration of silicon in the spruce wood ash increased as a result of mixing with spruce bark. It favors formation of low temperature melting potassium silicates.

  • 206.
    Wang, Liang
    et al.
    SINTEF Energy Research, Norway.
    Skreiberg, Øyvind
    SINTEF Energy Research, Norway.
    Becidan, Michael
    SINTEF Energy Research, Norway.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Investigation of rye straw ash sintering characteristics and the effect of additives2016Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 162, s. 1195-1204Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The understanding of ash sintering during combustion of agricultural residues is far from complete, because of the high heterogeneity of the content and composition of ash forming matters and the complex transformation of them. In order to make agricultural residues competitive fuels on the energy market, further research efforts are needed to investigate agricultural residues' ash sintering behavior and propose relevant anti-sintering measures. The aim of this work was to investigate the ash characteristics of rye straw and effects of additives. Three additives were studied regarding their abilities to prevent and abate rye straw ash sintering. Standard ash fusion characterization and laboratory-scale sintering tests were performed on ashes from mixtures of rye straw and additives produced at 550°C.Ash residues from sintering tests at higher temperatures were analyzed using a combination of X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive X-ray spectrometry (SEM-EDX). High sintering and melting tendency of the rye straw ash at elevated temperatures was observed. Severe sintering of the rye straw ash was attributed to the formation and fusion of low temperature K-silicates and K-phosphates with high K/Ca ratios. Among the three additives, calcite served the best one to mitigate sintering of the rye straw ash. Ca from the calcite promoted formation of high temperature silicates and calcium rich K-phosphates. In addition, calcite may hinder aggregating of ash melts and further formation of large ash slag. Therefore, the chemical reactions and physical restraining effects arose by calcite addition contributed to reduction of ash melts and sintering degree. Upon addition of kaolin, compositions of rye straw ash shifted from low temperature melting K-silicates to high temperature melting K-Al-silicates. The changes of ash chemistry were favorable for reducing sintering of the rye straw ash. As the Ca-sludge was added, reduction of sintering of the ryestraw ash was less pronounced. Only K4CaSi3O9 and a small amount of KCaPO4 were identified in the rye straw ash as Ca-sludge was added.

  • 207.
    Wang, W.
    et al.
    Sun Yat-Sen University, China.
    Guo, Shaopeng
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Zhao, J.
    Tianjin University, China.
    Li, X.
    Tianjin University, China.
    Ding, J.
    Sun Yat-Sen University, China.
    Experimental study on the direct/indirect contact energy storage container in mobilized thermal energy system (M-TES)2014Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 119, nr 15, s. 181-189Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A mobilized thermal energy storage (TES) system has been proposed to recover and use industrial waste or excess heat for distributed users. In this paper, lab-scale test facilities have been built to understand the mechanisms of heat charging and discharging processes. The facilities consist of a direct/indirect-contact thermal energy storage container, heat transfer oil (HTO)/water tanks, an electrical boiler, HTO/water pumps and a plate heat exchanger. The organic phase change material (PCM), erythritol, which is sugar alcohol, was chosen as the working material due to its large heat density (330. kJ/kg) and suitable melting point (118. °C) for industrial low-temperature heat recovery, as well as non toxic and corrosive. Although differential scanning calorimetry tests have shown that a large temperature range exists during the phase change of erythritol, it did not affect the heat discharging during the tests of system performance. Heat charging/discharging results show that for the direct-contact storage container, heat discharging process is much faster than charging process. At the initial stage of heat charging, heat transfer oil is blocked to enter the container, resulting in a slow charging rate. Meanwhile, the PCM attached on the container wall on the bottom always melts last. It has been found that increasing the flow rate of HTO can effectively enhance the charging/discharging processes. For the indirect-contact storage container, heat charging and discharging take almost the same time; and the flow rate of HTO does not show an obvious effect on the charging and discharging processes due to the weak thermal conductivity of the solid phase change material. Comparatively, using the direct-contact storage container may achieve shorter charging/discharging processes than using the indirect-contact storage container.

  • 208.
    Wang, W.
    et al.
    Sun Yat-sen University, Guangzhou, China.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Guo, S.
    Inner Mongolia University of Science and Technology, Baotou, China .
    He, S.
    Guangzhou University, Guangzhou, China.
    Ding, J.
    Sun Yat-sen University, Guangzhou, China.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Sun Yat-sen University, Guangzhou, China.
    Yang, J.
    South China University of Technology, Guangzhou, China.
    Numerical simulation study on discharging process of the direct-contact phase change energy storage system2015Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 150, s. 61-68Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The mobilized thermal energy storage system (M-TES) has been demonstrated as a promising technology to supply heat using waste heat in industries to distributed users, where heat discharging determines whether M-TES system can satisfy the required heating rate. The objective of this work is to investigate the solidification mechanism of phase change materials (PCM) for heat discharging in a direct-contact thermal energy storage (TES) container for M-TES. A 2-dimensional (2D) numerical simulation model of the TES tank is developed in ANSYS FLUENT, and validated with the experimental measurement. Effects of flow rate and inlet temperature of heat transfer oil (HTO) were studied. Results show that (a) the discharging process includes the formation of solidified PCM followed by the sinking of solidified PCM; (b) the discharging time of M-TES can be reduced by increasing the flow rate of heat transfer oil. When the flow rate is increased from 0.46m3/h to 0.92m3/h, the solidified PCM is increased from 25vol.% to 90vol.% within 30min; (c) the discharging time can be reduced by decreasing the inlet temperature of HTO. While the inlet temperature is reduced from 50°C to 30°C, the solidified PCM is increased from 60vol.% to 90vol.% within 30min. This work provides engineering insights for the rational design of discharging process for M-TES system. 

  • 209.
    Wang, Y.
    et al.
    Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Tianjin, China.
    Nian, V.
    Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Tianjin, China.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Yuan, J.
    China Institute of FTZ Supply Chain, Shanghai Maritime University, Shanghai, China.
    Life cycle analysis of integrated gasification combined cycle power generation in the context of Southeast Asia2018Ingår i: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 11, nr 6, artikel-id en11061587Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Coal remains a major source of electricity production even under the current state of developments in climate policies due to national energy priorities. Coal remains the most attractive option, especially to the developing economies in Southeast Asia, due to its abundance and affordability in the region, despite the heavily polluting nature of this energy source. Gasification of coal running on an integration gasification combined cycle (IGCC) power generation with carbon capture and storage (CCS) represents an option to reduce the environmental impacts of power generation from coal, but the decarbonization potential and suitability of IGCC in the context of Southeast Asia remain unclear. Using Singapore as an example, this paper presents a study on the life cycle analysis (LCA) of IGCC power generation with and without CCS based on a generic process-driven analysis method. We further evaluate the suitability of IGCC with and without CCS as an option to address the energy and climate objectives for the developing economies in Southeast Asia. Findings suggest that the current IGCC technology is a much less attractive option in the context of Southeast Asia when compared to other available power generation technologies, such as solar photovoltaic systems, coal with CCS, and potentially nuclear power technologies.

  • 210.
    Wang, Y.
    et al.
    Tianjin University of Commerce, Tianjin, China.
    Wang, B.
    Tianjin University of Commerce, Tianjin, China.
    Zhu, K.
    Tianjin University of Commerce, Tianjin, China.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Tianjin University of Commerce, Tianjin, China.
    He, W.
    Tianjin University of Commerce, Tianjin, China.
    Liu, S.
    Tianjin University of Commerce, Tianjin, China.
    Energy saving potential of using heat pipes for CPU cooling2018Ingår i: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 143, s. 630-638Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Air cooling is the most common cooling solution for central processing units (CPUs). However, the heat dissipation capacity of conventional air-cooled heatsinks is limited because of non-uniform temperature distribution in the base of heatsinks. Embedded heat pipes into the heatsink is an effective method to improve the heat dissipation of the CPU and make the temperature distribution of the heatsink base more uniform. This work studied the cooling performance of the heat pipe embedded heatsinks, including the surface temperature, the average temperature of base, the thermal resistance and the power consumption. The impact of the different arrangements of heat pipes on the temperature distribution was also investigated. Results show that to obtain the same CPU temperature, a lower air velocity was needed for the heatsink with embedded heat pipe at the same heat flux. The minimum thermal resistance of the studied heat pipe embedded heatsinks was 0.15 °C/W, which is lower than that of the reference conventional heatsink, 0.22 °C/W. In addition, the heatsink with H-shape arrangement of embedded heat pipes had the best overall performance, which cooling capacity was increased by 22.5% and the weight of the heatsink was reduced by 30.1% compared with the heatsink without heat pipes. The energy saving potential was also evaluated based on the measured real operating status of CPUs. The dynamic simulation results show that the total fan power consumption can be effectively reduced when using a heat pipe embedded heatsink to replace the conventional heatsink, which can be up to 66.2%. 

  • 211.
    Wang, Y.
    et al.
    Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, China.
    Zhu, K.
    Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, China.
    Cui, Z.
    Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, China.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, China.
    Wei, J.
    Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, China.
    Evaluation of water cooling heat sink performance and dynamic flow effect2019Ingår i: Energy Procedia, Elsevier Ltd , 2019, Vol. 158, s. 2417-2422Konferensbidrag (Refereegranskat)
    Abstract [en]

    With the advent of high-performance of data centre, the energy consumption of servers has proliferated. Consequently, the generated tremendous amount of heat requires huge energy consumption. Improving energy efficiency is going to play a key role in reducing the energy consumption of data centre. Adopting the heat sink with higher heat transfer and flow performance or precisely control the cooling capacity are two effective way for energy saving in heat dissipation. In this paper, three water cooled heat sink with different pin fin are evaluated by experiments. The heat sink with square pin fin has better heat and flow effect. Meanwhile, the precisely control of the pump power according to the working load is used for energy saving. The energy saving effect is evaluated by benefit factor. However, the most effective way of energy saving is adopting the heat sink with higher comprehensive effect. 

  • 212.
    Wei, P.
    et al.
    Institute of the Building Environment and Sustainability Technology, School of Human Settlements and Civil Engineering, Xi'An Jiaotong University, Xi'an, 710049, China.
    Cheng, H.
    Institute of the Building Environment and Sustainability Technology, School of Human Settlements and Civil Engineering, Xi'An Jiaotong University, Xi'an, 710049, China.
    Liu, W.
    Institute of the Building Environment and Sustainability Technology, School of Human Settlements and Civil Engineering, Xi'An Jiaotong University, Xi'an, 710049, China.
    Congfu, M.
    Institute of the Building Environment and Sustainability Technology, School of Human Settlements and Civil Engineering, Xi'An Jiaotong University, Xi'an, 710049, China.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Yang, X.
    Institute of the Building Environment and Sustainability Technology, School of Human Settlements and Civil Engineering, Xi'An Jiaotong University, Xi'an, 710049, China.
    Jin, L.
    Institute of the Building Environment and Sustainability Technology, School of Human Settlements and Civil Engineering, Xi'An Jiaotong University, Xi'an, 710049, China.
    Numerical study on thermal energy storage tube filled by metal foam with gradient porosities2019Ingår i: IOP Conference Series: Earth and Environmental Science, Institute of Physics Publishing , 2019, Vol. 268, nr 1, artikel-id 012163Konferensbidrag (Refereegranskat)
    Abstract [en]

    Thermal energy storage has attracted more and more attentions due mainly to its ability of peak load shifting. Shell-and-tube configuration is a typical heat exchanger for thermal energy storage. To enhance phase change heat transfer, open-cell metal foam has been involved in various kinds of shell-and-tube heat exchangers. To further improve the overall thermal performance of a shell-and-tube heat exchanger, metal foams with gradient porosities were inserted into the shell side. Positive and negative gradients in porosity were studied for comparison. Numerical model was developed based on the finite volume method and three sets of numerical simulations were performed. Transient melting front and melting fraction were illustrated for comparison. Results demonstrated that the positive gradient in porosity outperformed the other two kinds of configurations, resulting in a 17.5% reduction in full melting time. 

  • 213.
    Weidong, Wang
    et al.
    Sun Yat-sen University, Guangzhou, China.
    Shiquan, He
    Guangzhou University, Guangzhou, China.
    Jing, Ding
    Sun Yat-sen University, Guangzhou, China.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Jianping, Yang
    South China University of Technology, Guangzhou, China.
    Numerical Evaluation on a Direct-contact Thermal Energy Storage System2017Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 105, s. 4389-4394Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study evaluates numerically various configurations of direct-contact PCM thermal energy storage devices, regarding inlet location, inlet flow directions, pre-heating and inlet tubes with straight fins. The direct-contact conjugate heat transfer between the heat transfer fluid (HTF) and PCM during melting process, is solved numerically by enthalpy-porosity formulation in the computational fluid dynamic approach. The results indicate that pre-heating could form channels in a short time, which improve heat transfer rate for charging stages. To further enhance heat transfer performance, inlet tubes embedded with straight fins. Compared to pre-heating method, the electric power can be saved. Each design are evaluated with respect to their heat transfer performance vis-à-vis heat storage ratio.

  • 214.
    Wennersten, Ronald
    et al.
    Shandong University, China.
    Sun, Qie
    Shandong University, China.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    The Future Potential for Carbon Capture and Storage in Climate Change Mitigation: An overview from perspectives of technology, economy and risk2015Ingår i: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 103, s. 724-736Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    According to the recent IPCC reports, the effects from anthropogenic climate change effects are becoming more serious and actions more urgent. The global mean concentration of CO2, the most important Greenhouse Gas (GHG), in the atmosphere is now close to 400 ppm. The most comprehensive research efforts concerning safe levels propose that we should strive to keep the atmospheric concentration of CO2below 350 ppm. This is also a more transparent global goal than using effects in the components of the climate system. Most scenarios show that the combustion of fossil fuels will increase in the future, while the development of renewables is still too marginal to stop this growth. The possibility that countries will leave fossil resources underground does not seem realistic. The only options in the short run to halt emissions of CO2 are the large-scale application of Carbon Capture and Storage (CCS) in combination with increased energy efficiency. In the long run, we have to radically transform our societal metabolism towards greater resource efficiency, where renewables can play a more important role. The main barriers for implementation of CCS on a large scale are not technical, but economic and social. As long as the costs for emitting CO2 are much lower than implementing CCS technology, there will not be a market-driven development of CCS. A major challenge for CCS will be to achieve wide public acceptance, since this will also affect the future political attitude to it. This will require an open communication about safety aspects early in the planning phase, where it can be shown that safety issues can be handled, even in the event of major leaks of CO2. To assume a low probability of accidents is not a feasible way forward in the communication process. The future concerning CO2 emissions will be determined very much by actions of the biggest emitters. The developed countries have already emitted a large amount of CO2 and must now take a step forward to show that they are willing to invest in CCS technology. At this stage, it is reasonable to expect developed countries to take a leading role in developing the CCS technology on a large-scale. It is highly probable that developing countries like China will follow this path in the near future, since they have a clear ambition to take a lead in climate change mitigation in the long run and to avoid blame for a deteriorating environment.

  • 215.
    Wilhelmsen, O.
    et al.
    Sintef Energy Research, Trondheim, Norway.
    Skaugen, G.
    Sintef Energy Research, Trondheim, Norway.
    Jørstad, O.
    tatoil ASA, Trondheim, Norway.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Evaluation of SPUNG# and other equations of state for use in carbon capture and storage modelling2012Ingår i: Energy Procedia, 2012, s. 236-245Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this work, Equations of State (EoS) relevant for carbon capture and storage modelling have been evaluated for pure CO2 and CO 2-mixtures with particular focus on the extended corresponding state approach, SPUNG/SRK. Our work continues the search of an EoS which is accurate, consistent and computationally fast for CO2-mixtures. These EoS have been evaluated: Soave-Redlich-Kwong (SRK), SRK with Peneloux shift, Peng-Robinson, Lee-Kesler, SPUNG/SRK and the multi-parameter approach GERG-2004. The EoS were compared to the accurate reference EoS by Span and Wagner for pure CO2. Only SPUNG/SRK and GERG-2004 predicted the density accurately near the critical point (< 1.5 % Absolute Average Deviation (AAD)). For binary mixtures, Lee-Kesler and SPUNG/SRK had similar accuracy in density predictions. SRK had a sufficient accuracy for the gas phase below the critical point (<2.5%), and Peng Robinson had a decent accuracy for liquid mixtures (<3%). GERG-2004 was the most accurate EoS for all the single phase density predictions. It was also the best EoS for all the VLE predictions except for mixtures containing CO2 and O2, where it had deviations in the bubble point predictions (∼20 % AAD). Even though multi-parameter EoS such as GERG-2004 are state-of-the-art for high accuracy predictions, this work shows that extended corresponding state EoS may be an excellent compromise between computational speed and accuracy. The SPUNG approach combines high accuracy with a versatile and transparent methodology. New experimental data may easily be taken into account to improve the predictive abilities in the two phase region. The approach may be improved and extended to enable applications for more difficult systems, such as polar mixtures with CO2 and H 2O.

  • 216.
    Wu, S.
    et al.
    National Engineering Laboratory for Electric Vehicles, School of Mechanical Engineering, Beijing Institute of Technology, Beijing, China.
    Xiong, R.
    National Engineering Laboratory for Electric Vehicles, School of Mechanical Engineering, Beijing Institute of Technology, Beijing, China.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Nian, V.
    Energy Studies Institute, National University of Singapore, Singapore.
    Ma, S.
    National Engineering Laboratory for Electric Vehicles, School of Mechanical Engineering, Beijing Institute of Technology, Beijing, China.
    The state of the art on preheating lithium-ion batteries in cold weather2020Ingår i: Journal of Energy Storage, E-ISSN 2352-152X, Vol. 27, artikel-id 101059Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Preheating batteries in electric vehicles under cold weather conditions is one of the key measures to improve the performance and lifetime of lithium-ion batteries. In general, preheating can be divided into external heating and internal heating, depending on the location of the heat source. External heating methods are usually characterized by low system complexity, long heating time and high energy loss; while internal heating methods can achieve a shorter heating time, a higher heating efficiency and lower impacts on thermal-induced aging but at a higher risk in safety. Through reviewing recent progress in the development of preheating methods for lithium-ion batteries, this paper provides insights on developing new preheating techniques and guidance on the selection of preheating methods. 

  • 217.
    Wu, T.
    et al.
    China University of Petroleum, Beijing, China.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Tianjin University of Commerce, Tianjin, China.
    Wallin, Fredrik
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Yu, Z.
    University of Stavanger, Stavanger, Norway.
    Optimizing the Energy Structure for Space Heating - An Approach Based on External Cost2017Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 142, s. 3194-3199Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Coal is the dominating fuel for heating, resulting in serious air pollution in China especially in winter. To mitigate the problem, Chinese government has issued policies to motivate consumers to use natural gas to replace coal. Considering the high price of natural gas, in order to further promote the utilization of natural gas, this paper has proposed a new method that considers the external cost of fuel when optimizing the energy structure for space heating. The external cost is commonly used to reflect the impacts of pollutant emissions to measure social benefit. The proposed method has been applied to a case study for the regions of Beijing and Tianjin. Results show that optimizing the fuel consumption in Beijing and Tianjin as a whole can reduce the external cost by 36 million dollars. 

  • 218.
    Xi, X.
    et al.
    Academy of Chinese Energy Strategy, China University of Petroleum(Beijing), Beijing 102249, China.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Wallin, Fredrik
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Avelin, Anders
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Yang, X.
    Academy of Chinese Energy Strategy, China University of Petroleum(Beijing), Beijing 102249, China.
    Yu, Z.
    Department of Energy and Petroleum Engineering, University of Stavanger, Stavanger 4036, Norway.
    Air pollution related externality of district heating - A case study of Changping, Beijing2019Ingår i: Energy Procedia, Elsevier Ltd , 2019, s. 4323-4330Konferensbidrag (Refereegranskat)
    Abstract [en]

    Air pollution, caused by the use of fossil fuel, has been an environmental plague in China. It has a strong negative impact on human health. Since the costs of damage to health are not born by the pollution producers, these costs translate to social externality. Policies have an important role in optimizing resource allocation, such as penalizing the pollutant producers and incentivizing clean energy development. Among others, replacing coal with natural gas for heating represents an important example of air quality improvement measures. This paper presents a study that evaluates the health impacts from air pollution and the external cost of the "Coal-To-Gas" policy in district heating using Changping District (Beijing, China) as an example. Four scenarios were considered based on the historical and standard PM2.5 concentration. Results show that PM2.5 is responsible for causing an increase of 40% premature deaths in 2015 and that the monetary value of damage to health is higher than 1.2 billion CNY. In 2016 and 2017, the reported air quality was better than that in 2015. As a result, 13.3% and 26% premature deaths caused by air pollution were avoided in 2016 and 2017 compared to 2015 respectively. If the PM2.5 concentration level were to be reduced to national standard, the number of premature deaths attributed to PM2.5 could further decrease to 47.7% compared to 2015. Overall, the Coal-To-Gas policy in district heating reduces 0.017%~0.45% of premature death caused by air pollution each year. Air pollution reduction policies, which are expected to improve air quality together in the future, and the specific policy of Coal-To-Gas in district heating, could make great contribution to reducing the premature death caused by environmental problem and need more attention from the government and the public.

  • 219.
    Xie, J.
    et al.
    Beijing University of Posts and Telecommunications, Beijing, China.
    Guo, J.
    Beijing University of Posts and Telecommunications, Beijing, China.
    Ma, Z.
    Beijing University of Posts and Telecommunications, Beijing, China.
    Xue, J. -H
    University College London, London, United Kingdom.
    Sun, Q.
    Shandong University, Jinan, China.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Tianjin University of Commerce, Tianjin, China.
    SEA: A Combined Model for Heat Demand Prediction2018Ingår i: Proceedings of 2018 6th IEEE International Conference on Network Infrastructure and Digital Content, IC-NIDC 2018, Institute of Electrical and Electronics Engineers Inc. , 2018, s. 71-75Konferensbidrag (Refereegranskat)
    Abstract [en]

    Heat demand prediction is a prominent research topic in the area of intelligent energy networks. It has been well recognized that periodicity is one of the important characteristics of heat demand. Seasonal-trend decomposition based on LOESS (STL) algorithm can analyze the periodicity of a heat demand series, and decompose the series into seasonal and trend components. Then, predicting the seasonal and trend components respectively, and combining their predictions together as the heat demand prediction is a possible way to predict heat demand. In this paper, STL-ENN-ARIMA (SEA), a combined model, was proposed based on the combination of the Elman neural network (ENN) and the autoregressive integrated moving average (ARIMA) model, which are commonly applied to heat demand prediction. ENN and ARIMA are used to predict seasonal and trend components, respectively. Experimental results demonstrate that the proposed SEA model has a promising performance.

  • 220. Xueqin, Yang
    et al.
    Li, Hailong
    Mälardalens högskola, Akademin för innovation, design och teknik. Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Wallin, Fredrik
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Zhixin, Yu
    Zhen, Wang
    Impacts of emission reduction and external cost on natural gas distribution2017Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 207, s. 553-561Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Natural gas, as a cleaner fossil fuel energy resource, is playing an increasingly important role in the futureenergy mix to achieve emission reduction target globally. In this study, a new method based on the exter-nal cost is developed to identify an optimal solution for natural gas distribution. China is selected for acase study. Both the economic cost and the external cost of pollutant emissions have been considered.The provincial distribution of natural gas and other energy resources is optimized with the aim to min-imize both economic and external costs. Results show that the supply of natural gas should be prioritizedfor Beijing, Tianjin and Shanghai, owing to higher external costs and the optimized distribution canreduce the overall external cost by 4% in China. The optimization of natural gas distribution will alsoinfluence CO2emissions, therefore, the determination of the reduction target for each province shouldconsider the external cost. Sensitivity study also shows that the minimum energy demand, the maximumnatural gas supply and the minimum natural gas demand are the key parameters that impact the opti-mized distribution for each province.

  • 221.
    Yan, A.
    et al.
    Tianjin University, Tianjin, China .
    Zhao, J.
    Tianjin University, Tianjin, China .
    An, Q.
    Tianjin University, Tianjin, China .
    Zhao, Y.
    Tianjin University, Tianjin, China .
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Huang, Y. J.
    Fudan University, Shanghai, China .
    Hydraulic performance of a new district heating systems with distributed variable speed pumps2013Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 112, s. 876-885Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The application of distributed variable speed pumps (DVSP) in the district heating (DH) network has been considered as a technology improvement that has a potential of saving energy, compared to the conventional central circulating pump (CCCP) DH system. A hydraulic model was developed to simulate the hydraulic performance of such a DVSP DH system, based on Kirchhoff's laws. It was applied to a real DH network in Kuerle, China. In order to improve the model accuracy, a new parameter called resistance ratio was proposed by comparing the measured data and the simulated result. The validation result shows that the model has the ability to predict the hydraulic behavior of the DVSP system. The results show that when the rotational speeds of all substation pumps are synchronously decreased by the same percentage, the pump heads and the flow rates are also reduced synchronously and almost in the same degree in all loops. In addition, two operation cases of DH were investigated, including (I) the flow rate varies in all of the loops simultaneously, and (II) the flow rate varies only in one of the loops. For both cases, the DVSP system has a better performance of saving energy at least 30% than the CCCP system. Compared to the CCCP system, the installed pump capacities can be smaller in the DVSP system. Hence, applying DSVP, especially at a low flow rate, can save quite much electricity. Based on the example network in Kuerle, the DVSP system consumes electricity 71% and 31% less than the CCCP system for Cases I and II respectively.

  • 222.
    Yan, J.
    et al.
    KTH Royal Institute of Technology.
    Yang, Ying
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Campana, Pietro Elia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. KTH Royal Institute of Technology.
    He, J.
    Tsinghua University, Beijing, China.
    City-level analysis of subsidy-free solar photovoltaic electricity price, profits and grid parity in China2019Ingår i: Nature Energy, ISSN 2058-7546, Vol. 4, nr 8, s. 709-717Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In recent years, China has become not just a large producer but a major market for solar photovoltaics (PV), increasing interest in solar electricity prices in China. The cost of solar PV electricity generation is affected by many local factors, making it a challenge to understand whether China has reached the threshold at which a grid-connected solar PV system supplies electricity to the end user at the same price as grid-supplied power or the price of desulfurized coal electricity, or even lower. Here, we analyse the net costs and net profits associated with building and operating a distributed solar PV project over its lifetime, taking into consideration total project investments, electricity outputs and trading prices in 344 prefecture-level Chinese cities. We reveal that all of these cities can achieve—without subsidies—solar PV electricity prices lower than grid-supplied prices, and around 22% of the cities’ solar generation electricity prices can compete with desulfurized coal benchmark electricity prices.

  • 223.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. School of Chemical Engineering and Technology, Royal Institute of Technology.
    Chen, B.
    Beijing Normal University, China.
    Wennersten, R.
    Shandong University, China.
    Campana, Pietro Elia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Yang, J.
    China University of Geosciences, China.
    Cleaner energy for transition of cleaner city2017Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 196, s. 97-99Artikel i tidskrift (Refereegranskat)
  • 224.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Chou, S. K.
    National University of Singapore, Singapore.
    Dahlquist, Erik
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Innovative research for sustainable energy systems2015Ingår i: International Journal of Green Energy, ISSN 1543-5075, E-ISSN 1543-5083, Vol. 12, nr 3, s. 191-191Artikel i tidskrift (Övrigt vetenskapligt)
  • 225.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Royal Institute of Technology, Stockholm, Sweden.
    Desideri, U.
    Universita’ di Perugia, Università degli Studi di Pisa, Pisa, Italy.
    Chou, S. K.
    National University of Singapore, Singapore.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Energy solutions for a sustainable world2016Ingår i: International Journal of Green Energy, ISSN 1543-5075, E-ISSN 1543-5083, Vol. 13, nr 8, s. 757-758Artikel i tidskrift (Refereegranskat)
  • 226.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Kaldellis, P. J. K.
    University of West Attica, Greece.
    Campana, Pietro Elia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    REM2018: Renewable Energy Integration with Mini/Microgrid2019Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 159Artikel i tidskrift (Övrigt vetenskapligt)
  • 227.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Shamim, T.
    Masdar Institute of Science and Technology, Abu Dhabi, United Arab Emirates.
    Chou, S. K.
    National University of Singapore, Singapore.
    Desideri, U.
    Università di Pisa, Largo Lucio Lazzarino, Pisa, Italy .
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Clean, efficient and affordable energy for a sustainable future2017Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 185, s. 953-962Artikel i tidskrift (Refereegranskat)
  • 228.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Royal Inst Technol, Stockholm, Sweden.
    Shamim, T.
    Masdar Inst Sci & Technol, Abu Dhabi, U Arab Emirates.
    Choud, S. K.
    Natl Univ Singapore, Singapore.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Clean, Efficient and Affordable Energy for a Sustainable Future - The Proceedings of the 7th International Conference on Applied Energy (ICAE2015)2015Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 75, s. 1-2Artikel i tidskrift (Övrigt vetenskapligt)
  • 229.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Royal Inst Technol, Stockholm, Sweden.
    Sun, F.
    Beijing Inst Technol, Peoples R China..
    Chou, S. K.
    Natl Univ Singapore, Singapore..
    Desideri, U.
    Univ Pisa, Pisa, Italy..
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Campana, Pietro Elia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Xiong, R.
    Beijing Inst Technol, Peoples R China.
    Transformative Innovations for a Sustainable Future2017Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 204, s. 867-872Artikel i tidskrift (Övrigt vetenskapligt)
  • 230.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Royal Inst Technol, Sweden.
    Sun, F.
    Beijing Inst Technol, Beijing, Peoples R China.
    Chou, S. K.
    Natl Univ Singapore, Singapore.
    Desideri, U.
    Univ Pisa, Italy..
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Campana, Pietro Elia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Xiong, R.
    Beijing Inst Technol, Natl Engn Lab Elect Vehicles, Beijing 100081, Peoples R China..
    Transformative innovations for a sustainable future2018Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 231, s. 1383-1388Artikel i tidskrift (Refereegranskat)
  • 231.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Royal Inst Technol, Sch Chem Sci & Engn, S-10044 Stockholm, Sweden..
    Sun, F.
    Beijing Inst Technol, Natl Engn Lab Elect Vehicles, Peoples R China..
    Chou, S. K.
    Natl Univ Singapore.
    Desideri, U.
    Univ Pisa, Italy..
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Campana, Pietro Elia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Xiong, R.
    Beijing Inst Technol, Peoples R China..
    Transformative innovations for a sustainable future - Part III2018Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 227, s. 1-6Artikel i tidskrift (Övrigt vetenskapligt)
  • 232.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Royal Inst Technol, Sch Chem Sci & Engn, S-10044 Stockholm, Sweden.;Malardalen Univ, Sch Business Soc & Energy, S-72123 Vasteras, Sweden..
    Sun, F.
    Beijing Inst Technol, Natl Engn Lab Elect Vehicles, Beijing 100081, Peoples R China..
    Choug, S. K.
    Natl Univ Singapore, Dept Mech Engn, 9 Engn Dr 1,Blk EA 04-12, Singapore 117576, Singapore..
    Desideri, U.
    Univ Pisa, Dept Energy Syst Terr & Construct Engn, I-56122 Pisa, Italy..
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Campana, Pietro Elia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Xiong, R.
    Beijing Inst Technol, Natl Engn Lab Elect Vehicles, Beijing 100081, Peoples R China..
    Transformative Innovations for a Sustainable Future - Part II2017Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 207, s. 1-6Artikel i tidskrift (Övrigt vetenskapligt)
  • 233.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Royal Institute of Technology, Sweden.
    Wu, J.
    Cardiff University, United Kingdom.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Proceedings of the 9th International Conference on Applied Energy2017Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 142, s. 1-2Artikel i tidskrift (Refereegranskat)
  • 234.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. KTH-Royal Institute of Technology, Sweden.
    Wu, J.
    Tongji University, China.
    Yang, Ying
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Wang, H.
    Tongji University, China.
    Wang, X.
    Tongji University, China.
    Editorial cleaner energy for cleaner city2018Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 152, s. 1-2Artikel i tidskrift (Refereegranskat)
  • 235.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. School of Chemical Science and Engineering, Royal Institute of Technology, 100 44 Stockholm, Sweden.
    Yang, H.
    Department of Building Services Engineering, The Hong Kong Polytechnic University.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Chen, X.
    Department of Building Services Engineering, The Hong Kong Polytechnic University.
    Innovative solutions for energy transitions: Proceedings of the 10th International Conference on Applied Energy (ICAE2018)2019Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 158, s. 1-2Artikel i tidskrift (Övrigt vetenskapligt)
  • 236.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. KTH Royal Institute of Technology, Sweden.
    Zhai, Y.
    Asian Development Bank, Philippines .
    Wijayatunga, P.
    Asian Development Bank, Philippines .
    Mohamed, A. M.
    Minister of State for Environment and Energy, Maldives.
    Campana, Pietro Elia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Renewable Energy Integration with Mini/Microgrid2016Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 103, s. 1-2Artikel i tidskrift (Refereegranskat)
  • 237.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Royal Institute of Technology, Sweden.
    Zhai, Y.
    Asian Development Bank, Philippines.
    Wijayatunga, P.
    Asian Development Bank, Philippines.
    Mohamed, A. M.
    Minister of State for Environment and Energy, Maldives.
    Campana, Pietro Elia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Renewable energy integration with mini/micro-grids2017Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 201, s. 241-244Artikel i tidskrift (Refereegranskat)
  • 238.
    Yang, X.
    et al.
    Xi'an Jiaotong University, Xi'an, China.
    Niu, Z.
    Xi'an Jiaotong University, Xi'an, China.
    Bai, Q.
    Xi'an Jiaotong University, Xi'an, China.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Cui, X.
    Xi'an Jiaotong University, Xi'an, China.
    He, Y. -L
    Xi'an Jiaotong University, Xi'an, China.
    Experimental study on the solidification process of fluid saturated in fin-foam composites for cold storage2019Ingår i: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 161, artikel-id 114163Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Cold storage can effectively turn electricity to cold energy during off peak hours and reduce electricity peak load by supplying cold energy for air conditioning. Solid-liquid phase change rate is seriously encumbered by the relatively-low thermal conductivity of phase change materials (PCMs). A novel fin-foam structure was established to enhance solidification heat transfer and the solidification characteristics were experimentally explored. An experimental system visualizing solid-liquid interface and temperature monitoring was built. The parameters of fin-foam structure, including fin sizes, fin pitch and number were investigated experimentally. Particular attention was paid to justifying the local thermal equilibrium state via measuring temperature on metallic ligament surface and the saturating fluid in pore space. Results showed that inserting fins into metal foam can make a promotional improvement on solidification rate of water by 28.35%. The solid-liquid interface became locally curved after inserting fins. Thermal adhesive and insulation adhesive did not affect the accuracy at pore-scale temperature measurement. Solidification process can be further enhanced through increasing fin width and number rather than fin pitch. © 2019 Elsevier Ltd

  • 239.
    Yang, Xingyang
    et al.
    Tianjin University, China.
    Zhao, Li
    Tianjin University, China.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Yu, Zhixin
    University of Stavanger, Norway.
    Theoretical analysis of a combined power and ejector refrigeration cycle using zeotropic mixture2015Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 160, s. 912-919Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A theoretical study on a combined power and ejector refrigeration cycle using zeotropic mixture isobutane/pentane is carried out. The performances of different mixture compositions are compared. An exergy analysis is conducted for the cycle. The result reveals that most exergy destruction happens in the ejector, where more than 40% exergy is lost. The heat exchange in generator causes the second largest exergy loss, larger than 28%. As the mass fraction of isobutane changes ranges from 100% to 0%, the relative exergy destruction of each component is also changing. And mixture isobutane/pentane (50/50) has the maximum exergy efficiency of 7.83%. The parametric analysis of generator temperature, condenser temperature and evaporator temperature for all the mixtures shows that, all these three thermodynamic parameters have a strong effect on the cycle performance.

  • 240.
    Yang, Xueqin
    et al.
    China University of Petroleum, Beijing, China.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Wallin, Fredrik
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Wang, Zhen
    China University of Petroleum, Beijing, China.
    Impacts of Emission Reduction Target and External Costs on Provincial Natural Gas Distribution in China2017Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 105, s. 3326-3331Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Natural gas is playing a more and more important role in emission reduction, and it is regarded as inevitable choice for the future energy consumption. In this study, a mathematical model was developed to identify an optimal solution for natural gas distribution in China. In line with previous research studies, the economic cost is the most important criterion that was considered. Additionally, the external cost of emissions was included as a second criterion. In order to satisfy the energy conservation and emission reduction target, the paper contributes with an optimization approach of the provincial distribution of natural gas with the aim to minimize the comprehensive costs. The problem was solved using Lingo software. An important contribution of the paper is that external costs was considered in the optimization of natural gas distribution from a provincial level perspective.

  • 241.
    Yang, Ying
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    He, J.
    Wang, S.
    Kang, X.
    Zhang, Y.
    Campana, Pietro Elia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Yan, J
    Industrial And Commercial Distributed Solar PV Grid Parity Map: Based On The Analysis Of 345 Prefecture‐ Level Cities In China2018Konferensbidrag (Refereegranskat)
  • 242.
    Yang, Ying
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Zhang, Y.
    KTH Royal Institute of Technology, Stockholm, Sweden.
    Campana, Pietro Elia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. KTH Royal Institute of Technology, Stockholm, Sweden.
    Peak-shaving and profit-sharing model by Aggregators in residential buildings with PV- a case study in Eskilstuna, Sweden2017Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 142, s. 3182-3193Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Nowadays, photovoltaic (PV) system combined with energy storage systems is playing increasing significant role in residential buildings in Sweden. At the same time it brings reliability problems because of the intermittency of electricity production and exceptionally distributed reservoir which is followed by the peak-valley electricity prices and power grid fluctuations. There is an increasing need for new business model and economic paradigm for a third party aggregator to bridge the gap between Power Grid and end-users. Providing the valuable electricity services at scale and breaking regulatory arbitrage, aggregators help to deliver desired levels of residents’ engagements, value-added services and feasible level of unbundling of electricity market. This paper analyzes how the aggregators grab the indisputable business opportunity to interact between residents and Power Grid from the perspective of physical electricity flows and benefits share of peak-shaving. We employ a real case in Eskilstuna in Sweden to design new business model and validate using data. And the result indicates the compatibility of the aggregator service and its business model. It further sheds light on the pricing model of generated electricity by PV system, and benefits share ratio design.

  • 243.
    Yuting, Tan
    et al.
    Royal Institute of Technology, Sweden.
    Nookuea, Worrada
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Thorin, Eva
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Royal Institute of Technology, Stockholm, Sweden.
    Property Impacts on Plate-fin Multi-stream Heat Exchanger (Cold Box) Design in CO2 Cryogenic Process: Part II. Evaluation of Viscosity and Thermal Conductivity Models2017Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 105, s. 4595-4600Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Viscosity and thermal conductivity are key transport properties in the design of plate-fin multi-stream heat exchanger in CO2 cryogenic processes. It is necessary to evaluate the reliabilities of viscosity and thermal conductivity models. In addition, the differences in design of multi-stream heat exchanger by using different property models need to be studied as well. In this paper, viscosity models and thermal conductivity models of CO2 mixtures with non-condensable gas impurities were evaluated separately by comparison with existing experimental data. Recommendations were given on model selections and their impact on the design of plate-finmulti-stream heat exchanger were analyzed.

    The results show that for viscosity, the uncertainty range of Wilke’s model is the smallest with a maximum absolute deviation of 6.1%. This model is therefore recommended to be used. For thermal conductivity, GERG model, with a maximum absolute deviation of 8.7% is preferred. The choice of thermal conductivity model has a noticeabl eimpact on the plate-fin multi-stream heat exchanger design, and the maximum deviation by using different thermal conductivity models is 7.5%

  • 244.
    Zhang, C.
    et al.
    KTH, Stockholm, Sweden.
    Campana, Pietro Elia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. KTH, Stockholm, Sweden.
    Liu, C.
    Swedish Road and Transport Research Institute, Stockholm, Sweden.
    Wang, K.
    Beijing Institute of Technology, Beijing, 100081, China.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. KTH, Stockholm, Sweden.
    Crowdfunding preferences for a sustainable milk product with integrated photovoltaic water pumping system in China2019Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 255, artikel-id 113694Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper studies the role of potential investors in financing renewable energy systems—specifically, relating to crowdfunding as a financing mechanism, with the enhancement of internet and social-media tools. The research question in this study is whether crowdfunding with a novel socio-technical product reward program attracts potential customers to a more sustainable milk product with a specific integrated photovoltaic water pumping (PVWP) system. The particular case study we empirically investigated is product reward crowdfunding in dairy milk production in China. The milk production chain was supplied by PVWP system integration, which generated solar energy both for feed production for dairy cows and for the operation of dairy farms. 48 semi-structured in-depth interviews were conducted between the research team and customers in order to perform qualitative analyses of the determinants of customers’ milk purchase behaviors. In addition, 357 online surveys were collected for quantitative analysis. Binary and ordered probit regressions were employed to use survey date to systematically estimate purchase intention and willingness-to-pay for sustainable milk. Customer behaviors, environmental consciousness, and individual socio-demographic factors were investigated as potential explanatory variables. Over 82% of the survey participants showed intentions to purchase the sustainable milk with the PVWP system. In the survey and interview samples, results showed that milk quality, nutrition improvement, emissions reduction, and environmental benefits attributed to the integrated PVWP system were the major factors considered by interviewees who showed intentions to purchase the crowdfunded dairy milk. Regression model results suggested that potential customers with higher income levels, and those of parenting age, and those with young children or planning to have children, had a higher willingness-to-pay than other customers for the crowdfunded sustainable dairy milk. The familiarity with and popularity of online shopping and pre-sale purchases in China made customers more open to and proactive towards pre-pay and crowdfunding mechanisms. This article evaluated key factors which may influence potential customers for crowdfunding, and used a discrete choice model to estimate customers’ willingness-to-pay for reward-based projects. These results could help producers of sustainable milk products to identify potential target groups in China and estimate market demand. This exploratory study could provide a framework with both quantitative and qualitative assessment of crowdfunding for renewable energy systems in a national or international context. 

  • 245.
    Zhang, C.
    et al.
    School of Chemical Science and Engineering, Royal Institute of Technology, 100 44, Stockholm Sweden.
    Campana, Pietro Elia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. School of Business, Society and Engineering, Mälardalen University, 721 23 Västerås, Sweden; School of Chemical Science and Engineering, Royal Institute of Technology, 100 44, Stockholm Sweden.
    Liu, C.
    Division of Traffic Analysis and Logistics, Swedish Road and Transport Research Institute, 100 44 Stockholm, Sweden.
    Wang, K.
    Center for Energy and Environmental Policy Research & School of Management and Economics, Beijing Institute of Technology, 100081 Beijing, China.
    Zhang, Y.
    School of Chemical Science and Engineering, Royal Institute of Technology, 100 44, Stockholm Sweden.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. School of Business, Society and Engineering, Mälardalen University, 721 23 Västerås, Sweden; School of Chemical Science and Engineering, Royal Institute of Technology, 100 44, Stockholm Sweden.
    Purchase Intention for Crowd-funded Milk Products with Integrated Photovoltaic Water Pumping Systems in China2019Ingår i: Energy Procedia, Elsevier Ltd , 2019, Vol. 159, s. 503-508Konferensbidrag (Refereegranskat)
    Abstract [en]

    In comparison with current financing mechanisms for renewable energy systems, crowd-funding financing mechanism offers a new potential source of financing with recent use of social media. Crowd-funding financing mechanism can also increases the social supports for renewable energy systems as users and investors turn to be more actively engaged in energy systems. As a new potential source of financing, crowd-funding mechanism has different forms, including donation, lending, equity and product reward approaches. In this paper, discrete choice model was used to explore whether crowd-funding financing with a novel sociotechnical product reward practice, has the attractions for potential customers to pay for a more sustainable milk product with distributed photovoltaic (PV) system. We empirically investigated the reward-base crowd funding with the specific integrated photovoltaic water pumping (PVWP) system in dairy milk production in China. 48 in-depth interviews were adopted for qualitative analysis of determinants of customer milk purchase decision. The ordered probit regression was employed with 357 online surveys to systematically estimate the purchase intention for the online-crowd-funding sustainable milk. Customer behaviours, environmental consciousness, and the individual socio-demographic factors were tested as potential explanatory variables. In the survey and depth interview samples, we found interviewees as potential customers showed strong purchase intentions to the crowd funding dairy milk for noticing milk quality and nutritious improvement, emission reduction and environmental benefits by the integrated PVWP system. In our findings of the regression results, the females, customers with young children or planning to have children were found with higher willing to purchase than other customers for crowd funding the sustainable dairy milk. The familiarity and popularity with online shopping and pre-sale purchase in China made customers more open and active towards pre-pay and crowd-funding mechanism.

  • 246.
    Zhang, C.
    et al.
    Royal Institute of Technology, Stockholm, Sweden.
    Campana, Pietro Elia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Yang, J.
    Royal Institute of Technology, Stockholm, Sweden.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Analysis of Distributed Photovoltaic Financing: A Case Study Approach of Crowd-funding with Photovoltaic Water Pumping System in Microgrids2016Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 103, s. 387-393Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Distributed photovoltaic (PV) system is playing an increasingly significant role in the fast growing global PV market, as a renewable power supply source. In rural and remote areas, the integrated PV technology with remote micro-grid offers a potential solution for agriculture and small businesses to access to clean, reliable and efficient energy source. As the cost of solar PV modules continues to show a downward tendency, the distributed PV systems with remote micro-grid are capable to meet growing energy demand with affordable price. Meanwhile, a series of policies and actions have been enacted in China since 2013, to motivate the distributed-generation PV development as equal as large-scale PV development. However, compared to coal-fired power plants or large-scale PV systems, a barrier exists in securing financing of distributed PV systems, which has high up-front costs and the risk of commercializing renewable energy initiatives. Under current market incentives and barriers, this paper studies the existing financing methods in distributed PV systems with remote distributed micro-grids. In comparison with other financing sources, a case study approach is employed with distributed PV water pumping system in China to introduce crowd-funding as a new source of financing in distributed PV systems. Through the SWOT analysis, this paper identifies a capacity for new financial approach of crowd-funding with PVWP deployment. The scenario is modelled for different stakeholders and organization forms that target social network interactions in crowd-funding, and the results provide insights for incentives and policy.

  • 247.
    Zhang, C.
    et al.
    Energy Processes Division, Royal Institute of Technology, Stockholm, Sweden.
    Campana, Pietro Elia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Energy Processes Division, Royal Institute of Technology, Stockholm, Sweden.
    Yang, J.
    School of Humanities and Economic Management, China University of Geosciences, Beijing, China.
    Yu, C.
    Department of Earth System Science, Tsinghua University, Beijing, China.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Energy Processes Division, Royal Institute of Technology, Stockholm, Sweden.
    Economic assessment of photovoltaic water pumping integration with dairy milk production2018Ingår i: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 177, s. 750-764Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    As dairy consumption grows, domestic dairy farms face challenges in reducing the cost of feeds and the production of high-quality milk for market demands. This paper aims to introduce and integrate solar energy into the milk production chain to investigate its economic performance. By collecting data on milk production processes from 11 dairy farms in China, we quantified electricity usage and costs of milk production to identify the best and worst cases. Crop yields response to the water demand and the electricity requirements of the dairy farms were considered. The study simulated scenarios of self-sufficiency at 20%, 80%, and 100%, in the identified farms by integrating a photovoltaic water pumping (PVWP) system to provide both power and water for alfalfa and other feeds’ irrigation and subsequent milk production. We evaluated annual discounted cost, revenue and net profit under each scenario and case. The results showed that a dairy farm with an integrated PVWP system and self-sufficient feeds would lead to value add-ins, such as electricity saving with solar energy generation, economic cost saving of crops, and CO2 emission reduction. The analysis on return on investment (ROI) and internal rate of return (IRR) revealed that not all the self-sufficient feeds can bring positive marginal profit. Among the investigated scenarios and cases, the dairy farm marked out by the highest ROI with 3.12 and IRR with 20.4%, was the farm where the integrated PVWP system was used to reach 20% self-sufficiency (self-production of only alfalfa). The other scenarios and cases with higher levels of self-sufficiency showed lower ROIs and IRRs. This indicates that high self-production levels of feeds decrease the total profit due to high investment cost. Sensitivity analyses of crop price and operational cost were conducted for ROI with single and double factor approaches. Scale and production of feeds proportions should be carefully considered in improving the economic performance of dairy milk production.

  • 248.
    Zhang, C.
    et al.
    Royal Institute of Technology, Sweden.
    Campana, Pietro Elia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Yang, J.
    Royal Institute of Technology, Sweden.
    Zhang, J.
    China Petroleum Daily, Jia NO.3, AnHuali 2, ChaoYang District, Beijing, China Petroleum Daily, China.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Royal Institute of Technology, Sweden.
    Can Solar Energy be an Alternative Choice of Milk Production in Dairy Farms?: -A Case study of Integrated PVWP System with Alfalfa and Milk Production in Dairy Farms in China2017Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 105, s. 3953-3959Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    As China's dairy consumption grows, both the domestic milk production and the importation of dairy products are increasing to meet market demands. The objective of this study was to quantify electricity usage and cost of milk production with data analysis of dairy farms and evaluate the potential alternative energy supply-solar energy generated by PV water pumping system (PVWP). We collected data in milk production processes from 11 dairy farms in China. By selecting the optimal dairy farm, we simulate the scenario of solar power generation with PVWP system to provide power both for milk and alfalfa production. With estimations of electricity saving, economic cost saving and CO2 saving on every kg milk produced under PVWP system, we conclude that scenario PVWP with alfalfa and milk production can results in value add-ins, new sources of revenue, energy supply and emission reductions. 

  • 249. Zhang, Chi
    et al.
    Campana, Pietro Elia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Liu, C.
    Zhang, Yang
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. KTH, Sweden.
    Wang, K.
    Choice Preferences And Willingness‐To‐Pay For Crowd‐Funding With Integrated Photovoltaic Water Pumping System In Dairy Milk Production In China2018Konferensbidrag (Refereegranskat)
  • 250.
    Zhang, Chi
    et al.
    School of Chemical Science and Engineering, Royal Institute of Technology.
    Campana, Pietro Elia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Yang, Jan
    School of Chemical Science and Engineering, Royal Institute of Technology.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Economic performance of photovoltaic water pumping systems with business model innovation in China2017Ingår i: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 33, nr 1, s. 498-510Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Expansion by photovoltaic (PV) technologies in the renewable energy market requires exploring added value integrated with business model innovation. In recent years, a pilot trial of PV water pumping (PVWP) technologies for the conservation of grassland and farmland has been conducted in China. In this paper, we studied the added value of the PVWP technologies with an emphasis on the integration of the value proposition with the operation system and customer segmentation. Using the widely used existing PV business models (PV-roof) as a reference, we evaluated discounted cash flow (DCF) and net present value (NPV) under the scenarios of traditional PV roof, PVWP pilot, PVWP scale-up, and PVWP social network, where further added value via social network was included in the business model. The results show that the integrated PVWP system with social network products significantly improves the performance in areas such as the discounted payback period, internal rate of return (IRR), and return on investment (ROI). We conclude that scenario PVWP social network with business model innovation, can result in value add-ins, new sources of revenue, and market incentives. The paper also suggests that current policy incentives for PV industry are not efficient due to a limited source of revenue, and complex procedures of feed-in tariff verification.

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