mdh.sePublications
Change search
Link to record
Permanent link

Direct link
BETA
Publications (10 of 167) Show all publications
Li, H., Song, J., Sun, Q., Wallin, F. & Zhang, Q. (2019). A dynamic price model based on levelized cost for district heating. Energy, Ecology and Environment, 4(1), 15-25
Open this publication in new window or tab >>A dynamic price model based on levelized cost for district heating
Show others...
2019 (English)In: Energy, Ecology and Environment, ISSN 2363-7692, Vol. 4, no 1, p. 15-25Article in journal (Refereed) Published
Abstract [en]

District Heating (DH) is facing a tough competition in the market. In order to improve its competence, an effective way is to reform price models for DH. This work proposed a new dynamic price model based on the levelized cost of heat (LCOH) and the predicted hourly heat demand. A DH system in Sweden was used as a case study. Three methods were adopted to allocate the fuel cost to the variable costs of heat production, including (1) in proportion to the amount of heat and electricity generation; (2) in proportion to the exergy of generated heat and electricity; and (3) deducting the market price of electricity from the total cost. Results indicated that the LCOH-based pricie model can clearly reflect the production cost of heat. Through the comparison with other market-implemented price models, it was found that even though the market-implemented price models can, to certain extent, reflect the variations in heat demand, they cannot reflect the changes in production cost when different methods of heat production are involved. In addition, price model reforming can lead to a significant change in the expense of consumers and consequently, affect the selection of heating solution.

Place, publisher, year, edition, pages
Joint Center on Global Change and Earth System Science of the University of Maryland and Beijing Normal University, 2019
Keywords
District heating, Dynamic heat price, Heat demand, Levelized cost of heat, Price model
National Category
Energy Engineering Energy Systems
Identifiers
urn:nbn:se:mdh:diva-42917 (URN)10.1007/s40974-019-00109-6 (DOI)2-s2.0-85062437670 (Scopus ID)
Available from: 2019-03-19 Created: 2019-03-19 Last updated: 2019-03-19Bibliographically approved
Xi, X., Li, H., Wallin, F., Avelin, A., Yang, X. & Yu, Z. (2019). Air pollution related externality of district heating - A case study of Changping, Beijing. In: Energy Procedia: . Paper presented at 10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China (pp. 4323-4330). Elsevier Ltd
Open this publication in new window or tab >>Air pollution related externality of district heating - A case study of Changping, Beijing
Show others...
2019 (English)In: Energy Procedia, Elsevier Ltd , 2019, p. 4323-4330Conference paper, Published paper (Refereed)
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.

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Coal-To-Gas, District heating, Externality, Health effect, PM2.5
National Category
Medical Engineering
Identifiers
urn:nbn:se:mdh:diva-43140 (URN)10.1016/j.egypro.2019.01.789 (DOI)2-s2.0-85063905381 (Scopus ID)
Conference
10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China
Note

Export Date: 18 April 2019; Conference Paper; Correspondence Address: Li, H.; School of Business, Society and Engineering, Malardalen UniversitySweden; email: hailong.li@mdh.se

Available from: 2019-04-18 Created: 2019-04-18 Last updated: 2019-04-18
Liu, S., Wu, S., Hu, Y. & Li, H. (2019). Comparative analysis of air and CO2 as working fluids for compressed and liquefied gas energy storage technologies. Energy Conversion and Management, feb, 608-620
Open this publication in new window or tab >>Comparative analysis of air and CO2 as working fluids for compressed and liquefied gas energy storage technologies
2019 (English)In: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. feb, p. 608-620Article in journal (Refereed) Published
Abstract [en]

With the large-scale use of intermittent renewable energy worldwide, such as wind energy and solar energy, energy storage systems are urgently needed and have been rapidly developed. Technologies of compressed gas energy storage (CGES) and liquefied gas energy storage (LGES) are playing an important role, and air has been commonly used as working fluid. CO2 is another potential working fluid and attracting more and more attention due to the rise of CO2 capture and utilization. However, it is still unclear which is the better working fluid. This paper comparatively analyzed the performance of CGES and LGES systems using air and CO2 as working fluids. Both diabatic and adiabatic CGES are considered. Simulation results show that except diabatic CGES systems, using CO2 could achieve a similar or even higher round-trip efficiency than using air. In addition, the use of CO2 instead of air as a working fluid has additional advantages, such as a lower storage temperature can be achieved at the same storage pressure for the adiabatic CGES system; and a higher condensing temperature can be achieved at the same condensing pressure for the LGES system, which can benefit the system design and operation.

National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-41805 (URN)10.1016/j.enconman.2018.12.031 (DOI)000458221800048 ()2-s2.0-85059173064 (Scopus ID)
Available from: 2018-12-20 Created: 2018-12-20 Last updated: 2019-02-28Bibliographically approved
Song, C., Liu, Q., Deng, S., Li, H. & Kitamura, Y. (2019). Cryogenic-based CO2 capture technologies: State-of-the-art developments and current challenges. Renewable & sustainable energy reviews, 101, 265-278
Open this publication in new window or tab >>Cryogenic-based CO2 capture technologies: State-of-the-art developments and current challenges
Show others...
2019 (English)In: Renewable & sustainable energy reviews, ISSN 1364-0321, E-ISSN 1879-0690, Vol. 101, p. 265-278Article in journal (Refereed) Published
Abstract [en]

CO2 capture, utilization and storage has been recognized as a primary option to mitigate the issue of climate change caused by the utilization of fossil fuels. Several CO2 capture strategies have been developed, such as absorption, adsorption, membrane, chemical looping, hydrating and biofixation. Among different technologies, particular attention has been given to cryogenic CO2 capture by phase change. The aim of this study is to improve interest in cryogenic technologies for CO2 capture by providing an overview of the actual status of CCS. To reach this goal, the major strategies and technologies for CO2 capture from fossil fuel combustion have been reviewed. Simultaneously, the characteristics of cryogenic technologies for CO2 capture are summarized. The existing challenges that need to be overcome in cryogenic technology include cold energy sources, capture costs and impurities, etc. Finally, opportunities for the future development of cryogenic-based technologies are discussed. The results of this investigation indicated that cryogenic CO2 capture processes can be easily retrofitted to the existing industrial emission facilities and avoid the challenges associated with chemical solvents or physical sorbents. 

National Category
Energy Systems
Identifiers
urn:nbn:se:mdh:diva-41504 (URN)10.1016/j.rser.2018.11.018 (DOI)000454429100019 ()2-s2.0-85057097526 (Scopus ID)
Available from: 2018-12-06 Created: 2018-12-06 Last updated: 2019-01-10Bibliographically approved
Li, Y., Jin, Y., Borrion, A. & Li, H. (2019). Current status of food waste generation and management in China. Bioresource Technology, 273, 654-665
Open this publication in new window or tab >>Current status of food waste generation and management in China
2019 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 273, p. 654-665Article in journal (Refereed) Published
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-41789 (URN)10.1016/j.biortech.2018.10.083 (DOI)000453742100079 ()2-s2.0-85056380462 (Scopus ID)
Available from: 2018-12-20 Created: 2018-12-20 Last updated: 2019-01-03Bibliographically approved
Liu, S., Li, Z., Dai, B., Zhong, Z., Li, H., Song, M. & Sun, Z. (2019). Energetic, economic and environmental analysis of air source transcritical CO2 heat pump system for residential heating in China. Applied Thermal Engineering, 148, 1425-1439
Open this publication in new window or tab >>Energetic, economic and environmental analysis of air source transcritical CO2 heat pump system for residential heating in China
Show others...
2019 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 148, p. 1425-1439Article in journal (Refereed) Published
Abstract [en]

Using air source heat pump system for residential heating is a practical way to replace coal-fired boiler in China to alleviate the haze problem, and CO2 is a promising candidate to replace hydrochlorofluorocarbon (HCFC) or hydrofluorocarbon (HFCs) charged into the system. A mathematical model is developed to comprehensively evaluate the energetic, economical and environmental performances of CO2 heat pump system compared with other three traditional heating methods. The results indicate that the primary energy ratio of CO2 heat pump is the highest and it is a rational way to utilize renewable energy with the renewable energy contribution ratio of 0.60–0.69. The initial capital cost of CO2 heat pump is much higher due to the dominant compressor cost. The emission of CO2 heat pump is lower than that of coal-fired boiler at seasonal performance factor above 2.44. The initial and operation cost can be gradually reduced with the mass production and energy efficiency improvement of CO2 heat pump. It is believe that air source CO2 heat pump system can be employed for home heating in China, especial for the hot summer and cold winter region.

National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-41794 (URN)10.1016/j.applthermaleng.2018.08.061 (DOI)000460845100135 ()2-s2.0-85058452676 (Scopus ID)
Available from: 2018-12-20 Created: 2018-12-20 Last updated: 2019-03-28Bibliographically approved
Wang, Y., Zhu, K., Cui, Z., Li, H. & Wei, J. (2019). Evaluation of water cooling heat sink performance and dynamic flow effect. In: Energy Procedia: . Paper presented at 10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China (pp. 2417-2422). Elsevier Ltd, 158
Open this publication in new window or tab >>Evaluation of water cooling heat sink performance and dynamic flow effect
Show others...
2019 (English)In: Energy Procedia, Elsevier Ltd , 2019, Vol. 158, p. 2417-2422Conference paper, Published paper (Refereed)
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. 

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Data centre, Energy saving, Water-cooled heat sink
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:mdh:diva-43136 (URN)10.1016/j.egypro.2019.01.294 (DOI)2-s2.0-85063890339 (Scopus ID)
Conference
10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China
Note

Export Date: 18 April 2019; Conference Paper; Correspondence Address: Zhu, K.; Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of CommerceChina; email: zhukai210@tju.edu.cn

Available from: 2019-04-18 Created: 2019-04-18 Last updated: 2019-04-18
Zhu, K., Li, X., Li, H., Yang, Z. & Wang, Y. (2019). Experimental investigation on the effect of heat sink temperature on operational characteristics of a new-type loop heat pipe. In: Energy Procedia: . Paper presented at 10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China (pp. 2423-2429). Elsevier Ltd, 158
Open this publication in new window or tab >>Experimental investigation on the effect of heat sink temperature on operational characteristics of a new-type loop heat pipe
Show others...
2019 (English)In: Energy Procedia, Elsevier Ltd , 2019, Vol. 158, p. 2423-2429Conference paper, Published paper (Refereed)
Abstract [en]

With the development of the miniaturization and the high integration of electronic chip, the thermal management of the high power electronic becomes a major challenge. In this paper the influence of heat sink temperature on operational characteristics was comprehensively conducted and the 35% of charging ratio was selected through the experiment study. To evaluate the LHP system, temperatures, start-up time, thermal resistance, and evaporator heat transfer coefficient were selected as performance indicators. The result showed that, there existed an optimal heat sink temperature (18 o C) to obtain the lowest evaporator bottom temperature (77 o C), the shortest start-up time (1000s), the smallest thermal resistance (0.29k/W), and the highest evaporator heat transfer coefficient (3.110 4 W/(m 2 ·k)). The temperature range to keep a high performance of LHP system was 14-20 o C. The conclusion obtained through the experiment can provide the reference of design the cooling system when the LHP system applied into the electric cooling.

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Heat sink temperature, Loop heat pipe, Operational characteristics, Pressure head of evaporation
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:mdh:diva-43141 (URN)10.1016/j.egypro.2019.01.298 (DOI)2-s2.0-85063900961 (Scopus ID)
Conference
10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China
Note

Export Date: 18 April 2019; Conference Paper; Correspondence Address: Li, H.; Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of CommerceChina; email: lihailong@gmail.com

Available from: 2019-04-18 Created: 2019-04-18 Last updated: 2019-04-18
Lu, F., Liu, S., Dai, B., Zhong, Z., Li, H. & Sun, Z. (2019). Experimental study on thermal performance of transcritical CO 2 air source heat pump for space heating. In: Energy Procedia: . Paper presented at 10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China (pp. 5913-5919). Elsevier Ltd, 158
Open this publication in new window or tab >>Experimental study on thermal performance of transcritical CO 2 air source heat pump for space heating
Show others...
2019 (English)In: Energy Procedia, Elsevier Ltd , 2019, Vol. 158, p. 5913-5919Conference paper, Published paper (Refereed)
Abstract [en]

Employing transcritical CO 2 heat pump system for space heating is an effective way to solve the issue of air pollution during the heating season in China. Thus, an experimental setup is developed to study the thermal performance of the transcritical CO 2 air source heat pump system used for space heating. The test results show that a maximum coefficient of performance (COP) of 2.88 is obtained at the optimum discharge pressure and the ambient temperature of 10 o C. The optimal high pressure is nearly a constant with the value of about 8.5 MPa for the ambient temperature in the range of -15~10 o C. The system COP increases with the ambient temperature increasing, and the outlet temperature of the gas cooler is a dominant influencing factor on the thermal performance of the heat pump system. Little difference can be found between the gas cooler outlet temperatures with the variation in ambient temperatures.

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Air source, Carbon dioxide, Heat pump, Space heating, Transcritical cycle
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:mdh:diva-43143 (URN)10.1016/j.egypro.2019.01.532 (DOI)2-s2.0-85063906642 (Scopus ID)
Conference
10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China
Note

Export Date: 18 April 2019; Conference Paper; Correspondence Address: Dai, B.; Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of CommerceChina; email: dbm@tjcu.edu.cn

Available from: 2019-04-18 Created: 2019-04-18 Last updated: 2019-04-18
Hennessy, J., Li, H., Wallin, F. & Thorin, E. (2019). Flexibility in thermal grids: A review of short-term storage in district heating distribution networks. In: Energy Procedia: . Paper presented at 10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China (pp. 2430-2434). Elsevier Ltd, 158
Open this publication in new window or tab >>Flexibility in thermal grids: A review of short-term storage in district heating distribution networks
2019 (English)In: Energy Procedia, Elsevier Ltd , 2019, Vol. 158, p. 2430-2434Conference paper, Published paper (Refereed)
Abstract [en]

Future energy systems need to be more flexible. The use of cross-sector coupling in combination with thermal storage in thermal grids has been shown to provide such flexibility. The presented study reviews how short-term storage in district heating distribution networks is used or modelled for flexibility, what are the most important parameters, and where the knowledge gaps remain. The results show that the potential for flexibility from district heating has not been fully exploited. Sensible thermal storage tanks are 50-100 times cheaper than electrical storage and storage in the distribution network requires little additional investment in infrastructure. In some countries, the majority of district heating systems have sensible thermal storage tanks, with as much as 64 % of their capacity available for flexibility services. Initial results suggest that only smaller networks are prevented from using the distribution network for storage, but the impacts of this type of use on the physical components and the capacity limitations remain unclear and show a need for standardised methods for analysis. There is a growing interest, both in Europe and China, in the use of short-term storage in district heating to provide flexibility, particularly in the form of ancillary services to the electricity grid, but implementations of these techniques are rare. The presented study identifies a number of remaining knowledge gaps that should be addressed in order to harness available flexibility in district heating.

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Curtailment, District heating and cooling, Flexibility, Renewable energy, Thermal grids, Thermal inertia, Thermal storage
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:mdh:diva-43135 (URN)10.1016/j.egypro.2019.01.302 (DOI)2-s2.0-85063896688 (Scopus ID)
Conference
10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China
Note

Export Date: 18 April 2019; Conference Paper; Correspondence Address: Hennessy, J.; RISE Research Institutes of Sweden, Box 857, Sweden; email: jay.hennessy@ri.se

Available from: 2019-04-18 Created: 2019-04-18 Last updated: 2019-04-18
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-6279-4446

Search in DiVA

Show all publications