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  • 601.
    Yan, J.
    et al.
    North China Electric Power University, Beijing, 102206, China.
    Lai, F.
    North China Electric Power University, Beijing, 102206, China.
    Liu, Y.
    North China Electric Power University, Beijing, 102206, China.
    Yu, D. C.
    University of Wisconsin – Milwaukee, United States.
    Yi, W.
    Energy Research Institute of National Development and Reform Commission, China.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. KTH-Royal Institute of Technology, Sweden.
    Multi-stage transport and logistic optimization for the mobilized and distributed battery2019Ingår i: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 196, s. 261-276Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    High share of variable renewable energy is challenging to the traditional power system technically and economically. This calls for a significant increase to the system flexibility, which might result in the costs associated with energy storage and costly upgrades to the traditional transmission and distribution system. This paper presents a multi-stage battery transportation and logistics optimization method to increase the renewable energy consumptions, economics, and mobilities of the battery utilization. A new approach is proposed in which the batteries are charged in the renewable power plants and transported back and forth by railways between the renewable power plants and cities. Based on the forecasts of battery supplies/demands, multiple optimization stages (full train transport and carpooling) are designed by the branch-and-bound algorithm and genetic algorithm respectively. The proposed battery transportation and logistics concept and model are performed using the Beijing-Tianjin-Hebei region in China as an example. The results show that the levelized cost of energy of the battery transportation and logistics model is $0.045/kWh averagely. Also, by the use of mobilized batteries, the proposed battery transportation and logistics model increases the system flexibilities and renewable energy deliveries to the end users without the reinforcement of transmission and distribution system and any constraint from a highly penetrated power system.

  • 602.
    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.

  • 603.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. KTH Royal Inst Technol, Sch Chem Engn & Technol, Appl Energy, Sweden.
    Carbon Capture and Storage (CCS)2015Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 148, s. A1-A6Artikel i tidskrift (Övrigt vetenskapligt)
  • 604.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Negative-emissions hydrogen energy2018Ingår i: Nature Climate Change, ISSN 1758-678X, Vol. 8, nr 7, s. 560-561Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The race against time to mitigate climate change has increasingly focused on the development and deployment of bioenergy with carbon capture and storage. New research shows that negative-emissions hydrogen production is potentially a cost-effective alternative.

  • 605.
    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)
  • 606.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Chou, S. K.
    Natl Univ Singapore, Singapore..
    Chen, Bin
    Beijing Normal Univ, China..
    Sun, Fengchun
    Beijing Inst Technol, China..
    Jia, Hongjie
    Tianjin Univ, China..
    Yang, Jin
    China Univ Geosci, China..
    Clean, affordable and reliable energy systems for low carbon city transition2017Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 194, s. 305-309Artikel i tidskrift (Refereegranskat)
  • 607.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Royal Inst Technol, Sch Chem Sci & Engn,.
    Chou, Siaw-Kiang
    Natl Univ Singapore, Dept Mech Engn, Singapore 117576, Singapore.;Natl Univ Singapore, Energy Studies Inst, Singapore 119620, Singapore..
    Desideri, Umberto
    Univ Pisa, Dept Engn Energy Syst Terr & Construct, I-56122 Pisa, Italy..
    Lee, Duu-Jong
    Natl Taiwan Univ Sci & Technol, Dept Chem Engn, Taipei 10604, Taiwan.;Natl Taiwan Univ, Dept Chem Engn, Taipei 10614, Taiwan..
    Transition of clean energy systems and technologies towards a sustainable future (Part II)2016Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 162, s. 1109-1113Artikel i tidskrift (Övrigt vetenskapligt)
  • 608.
    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)
  • 609.
    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)
  • 610.
    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)
  • 611.
    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)
  • 612.
    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)
  • 613.
    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)
  • 614.
    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)
  • 615.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. KTH Royal Institute of Technology.
    Wang, C.
    Tianjin University, China.
    Yu, J.
    State Grid Tianjin Electric Power Co., China.
    Jia, H.
    Tianjin University, China.
    Wu, J.
    Cardiff University, United Kingdom.
    Xu, T.
    Tianjin University, China.
    Zhang, Yang
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Renewable Energy Integration with Mini/Microgrid2018Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 145, s. 1-2Artikel i tidskrift (Refereegranskat)
  • 616.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Applied Energy, Royal Institute of Technology (KTH).
    Wennersten, R.
    Shandong University, China.
    Chen, B.
    Beijing Normal University, China.
    Yang, J.
    China University of Geosciences, China.
    Lv, Y.
    Qilu University of Technology, China.
    Sun, Q.
    Applied Energy, Royal Institute of Technology.
    Editorial2016Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 104, s. 1-2Artikel i tidskrift (Refereegranskat)
  • 617.
    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)
  • 618.
    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)
  • 619.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. KTH.
    Yang, X.
    Xi'an Jiaotong University, Xi'an, China.
    Thermal energy storage2019Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, s. A1-A6Artikel i tidskrift (Refereegranskat)
  • 620.
    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)
  • 621.
    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)
  • 622.
    Yan, Jinyue
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. KTH Royal Inst Technol, Dept Chem Engn, Stockholm, Sweden..
    Zhang, Z.
    Chongqing University, Chongqing, China.
    Carbon Capture, Utilization and Storage (CCUS)2019Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 235, s. 1289-1299Artikel i tidskrift (Refereegranskat)
  • 623.
    Yang, Hongxing
    et al.
    Hong Kong Polytech Univ, Hong Kong, Hong Kong, Peoples R China..
    Leung, Dennis Y. C.
    Univ Hong Kong, Hong Kong, Hong Kong, Peoples R China..
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Royal Inst Technol, Stockholm, Sweden..
    First International Congress on Applied Energy, Hong Kong, January 5-7, 20092010Ingår i: International Journal of Green Energy, ISSN 1543-5075, E-ISSN 1543-5083, Vol. 7, nr 3, s. 223-223, artikel-id PII 922586049Artikel i tidskrift (Övrigt vetenskapligt)
  • 624.
    Yang, J.
    et al.
    Royal Institute of Technology, Stockholm, Sweden.
    Olsson, A.
    Royal Institute of Technology, Stockholm, Sweden.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Chen, B.
    Beijing Normal University, Beijing, China .
    A hybrid life-cycle assessment of CO2 Emissions of a PV water pumping system in China2014Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, s. 2871-2875Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    To achieve both water conservation and climate change mitigation benefits, photovoltaic water pumping (PVWP) system, which employs solar energy to fuel the water pumping system, has been a widely adopted solar energy technology in the last two decades. Although the PVWP system is driven by direct renewable flux, and has no onsite CO2 emissions, there must be energy consumed during the production of PV modules and the operation of water pumping system. Thus, we estimated the CO2 emissions of a PVWP system in Inner Mongolia, China in a life cycle perspective. A hybrid Life Cycle Analysis (LCA), which combines process-sum and economic input-out analysis was employed to reduce uncertainty. Results show that PVWP is a good choice for carbon emission reduction with carbon sequestration benefit much higher than the lifetime carbon emissions. The largest emitters are PV module and engineering, which should be the focus of carbon management of PVWP system.

  • 625.
    Yang, J.
    et al.
    University of Shanghai for Science and Technology, Shanghai, China.
    Yu, X.
    East China University of Science and Technology, Shanghai, China .
    An, L.
    East China University of Science and Technology, Shanghai, China .
    Tu, S. -T
    East China University of Science and Technology, Shanghai, China .
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    CO2 capture with the absorbent of a mixed ionic liquid and amine solution considering the effects of SO2 and O22017Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 194, s. 9-18Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Room-temperature ionic liquids (ILs) have recently been proposed as a potential candidate for CO2 capture. In this study, experiments were conducted in an absorption-desorption loop system to investigate the effects of SO2 and O2 on CO2 capture using an aqueous amine solution mixed with IL. The gas mixture containing CO2, O2, SO2 and N2 in the composition range of flue gas from a coal-fired power plant after flue gas desulfurization was selected as the feed gas. It was found that the addition of hydrophilic IL of 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) to a monoethanolamine (MEA) aqueous solution reduced the losses of MEA and water by lowering the saturated vapour pressure of the mixed absorbent. For hydrophobic IL of 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([hmim][Tf2N]), the MEA loss for 30 wt% MEA + 70 wt% [hmim][Tf2N] increased dramatically with the system running because carbonate, which was formed by MEA reacting with CO2, was insoluble in [hmim][Tf2N] at the absorber operation temperature of 323 K. The effects of O2 and SO2 were relatively insignificant for the MEA and water losses. The aqueous amine solution mixed with [bmim][BF4] showed good performances with a CO2 removal efficiency of above 90% and the SO2 concentration at the absorber outlet below 20 ppb. No obvious IL loss was detected. For the absorbent of 30 wt% MEA + 50 wt% [bmim][BF4] + 20 wt% H2O, the thermal energy consumption for absorbent regeneration is 33.8% lower than that of the aqueous MEA solution.

  • 626.
    Yang, J.
    et al.
    East China University of Science and Technology, Shanghai, China.
    Yu, X.
    East China University of Science and Technology, Shanghai, China.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Tu, S. -T
    East China University of Science and Technology, Shanghai, China.
    Xu, M.
    East China University of Science and Technology, Shanghai, China.
    CO2 capture using absorbents of mixed ionic and amine solutions2014Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 61, s. 2849-2853Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Studies have been conducted to find new absorbents for post-combustion CO2 capture. To overcome the ILs' limits and meanwhile take their advantages, the mixed amine + IL + H2O solutions as CO2 capture absorbent were investigated in a CO2 absorption/desorption loop setup. It was found that with an increase in IL concentration, the viscosity of the mixed solution rose while the energy required for absorbent regeneration decreased. In addition, no IL loss was detected and the amine loss per ton of captured CO2 was considerably lower than that of aqueous amine solution. The viscosity of the best candidate of 30 wt% MEA + 40 wt% [bmim][BF4] + 30 wt% H2O is close to the value of aqueous amine solution, indicating that the ionic liquid disadvantage of high viscosity can be overcome for absorbent delivery of CO2 capture.

  • 627.
    Yang, Perry Pei-Ju
    et al.
    Georgia Inst Technol, Eco Urban Lab, Coll Architecture, Atlanta, GA 30332 USA.;Tongji Univ, Coll Architecture & Urban Planning, Sino US Eco Urban Lab, Shanghai, Peoples R China..
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. KTH Royal Inst Technol, Sch Chem Sci & Engn, SE-10044 Stockholm, Sweden.;Malardalen Univ, Sch Business Soc & Engn, SE-72123 Vasteras, Sweden..
    Modeling Urban Design with Energy Performance2016Ingår i: CUE 2015 - APPLIED ENERGY SYMPOSIUM AND SUMMIT 2015: LOW CARBON CITIES AND URBAN ENERGY SYSTEMS, 2016, s. 3-8Konferensbidrag (Refereegranskat)
    Abstract [en]

    Traditional urban design methods focus on the form-making process and lack performance dimensions such as energy efficiency. There are inherent differences between Urban Design as a model of decision-making for choosing form alternatives and Energy System Modeling as a model of evaluating and assessing system functions. To design a high energy performance city, the gap between the two models must be bridged. We propose a research design that combines the Urban Design Computational Model (UDCM) and the Optimization Model of Energy Process (OMEP) to demonstrate how an urban design computation can be integrated with an energy performance process and system. An evidence-based case study of community-level near zero energy districts will be needed for future work.

  • 628.
    Yang, X.
    et al.
    Institute of the Building Environment & Sustainability Technology, School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, China.
    Bai, Q.
    Institute of the Building Environment & Sustainability Technology, School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, China.
    Zhang, Q.
    Beijing Municipal Key Lab of Heating, Gas Supply, Ventilating and Air Conditioning Engineering, Beijing University of Civil Engineering and Architecture, Xicheng District, Beijing, China.
    Hu, W.
    Beijing Municipal Key Lab of Heating, Gas Supply, Ventilating and Air Conditioning Engineering, Beijing University of Civil Engineering and Architecture, Xicheng District, Beijing, China.
    Jin, L.
    Institute of the Building Environment & Sustainability Technology, School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, China.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Royal Institute of Technology (KTH), Stockholm, Sweden.
    Thermal and economic analysis of charging and discharging characteristics of composite phase change materials for cold storage2018Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 225, s. 585-599Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study conducted both experimental and numerical investigations on the solidification behavior in a metal foam composite phase change material (PCM) for cold storage. Volume-average-method was adopted with the help of Forchheimer-Darcy equation to model the fluid flow through porous media. Experimental measurements were performed to validate the analytical model and the numerical method, with good agreement achieved. Local thermal equilibrium and non-equilibrium states were justified numerically and experimentally. Effect of pore morphological parameters (porosity and pore density) upon the solidification features of composite PCM were investigated. For the appliance of composite PCM to cold storage, techno-economic characteristics was also assessed. Results demonstrated that the full solidification time for metal foams with a porosity of 0.93 and 0.97 can be saved 87.5% and 76.7% respectively compared with pure water. It indicated that porosity of metal foam played a dominant role in heat transfer enhancement; while pore density seemed to have little influence on phase change behavior according to the results. Local natural convection in the unsolidified phase caused a remarkable promotion of the interface evolution, and the full solidification time with natural convection considered can be saved by 14.3% compared with pure conduction for the case with the same porosity of 0.97. The economic analyses indicated that using composite PCM was profitable with a short payback period less than 2 years.

  • 629.
    Yang, Xiaohu
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Institute of the Building Environment & Sustainability Technology, School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, China.
    Bai, Q.
    Institute of the Building Environment & Sustainability Technology, School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, China.
    Guo, Z.
    Institute of the Building Environment & Sustainability Technology, School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, China.
    Niu, Z.
    Institute of the Building Environment & Sustainability Technology, School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, China.
    Yang, C.
    School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, Singapore.
    Jin, L.
    Institute of the Building Environment & Sustainability Technology, School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, China.
    Lu, T. J.
    State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing, China.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Department of Chemical Engineering and Technology/Energy Processes, Royal Institute of Technology (KTH), Stockholm, Sweden.
    Comparison of direct numerical simulation with volume-averaged method on composite phase change materials for thermal energy storage2018Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 229, s. 700-714Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Melting heat transfer in open-cell metal foams embedded in phase-change materials (PCMS) predicted by the volume-averaged method (VAM) was systematically compared with that calculated using direct numerical simulation (DNS), with particular attention placed upon the contribution of natural convection in the melt region to overall phase change heat transfer. The two-temperature model based on the assumption of local thermal non-equilibrium was employed to account for the large difference of thermal conductivity between metallic ligaments and PCM (paraffin). The Forchheimer extended Darcy model was employed to describe the additional flow resistance induced by metal foam. For the DNS, a geometric model of metal foam based on tetrakaidehedron cells was reconstructed. The DNS results demonstrated significant temperature difference between ligament surface and PCM, thus confirming the feasibility of local thermal non-equilibrium employed in VAM simulations. Relative to the DNS results, the VAM combined with the two-temperature model could satisfactorily predict transient solid-liquid interface evolution and local temperature distribution, although pore-scale features of phase change were lost. The presence of natural convection affected significantly the melting front shape, temperature distribution and full melting. The contribution of natural convection to overall phase change heat transfer should be qualitatively and quantitatively given sufficient consideration from both macroscopic (VAM) and microscopic (DNS) point of views. Besides, practical significance and economic prospective using metal foam in TES unit for WHR system to provide residential heating or hot water is discussed and analyzed.

  • 630.
    Yang, Xiaohu
    et al.
    Xi'an Jiaotong University, Xi'an, China.
    Lu, Zhao
    Xi'an Jiaotong University, Xi'an, China .
    Bai, Qingsong
    Xi'an Jiaotong University, Xi'an, China.
    Zhang, Qunli
    Bei Jing University of Civil Engineering and Architecture, Beijing, China .
    Jin, Liwen
    Xi'an Jiaotong University, Xi'an, China.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. The Royal Institute of Technology (KTH), Stockholm, Sweden .
    Thermal performance of a shell-and-tube latent heat thermal energy storage unit: Role of annular fins2017Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 202, s. 558-570Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study conducts numerical investigations on melting process in a shell-and-tube latent heat thermal energy storage (LHTES) unit with annular fins. Commercial grade paraffin is employed as the phase change material (PCM) and water serves as the heat transfer fluid (HTF). Finite-volume-method (FVM) based numerical simulations are performed to investigate the effects of fin number, height and thickness on the phase change process. Particular attention is made to justify the contribution of local natural convection to the overall phase change process. Results demonstrate that the full melting time could be maximally reduced by 65% by inserting annular fins into PCM. For maximizing thermal performance, an optimal group fin parameter (fin number N = 31, thickness t/l = 0.0248 and interval l/L = 0.0313) is recommended for the present study.

  • 631.
    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.

  • 632.
    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.

  • 633.
    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)
  • 634.
    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.

  • 635.
    Yin, C.
    et al.
    Aalborg University, Aalborg East, Denmark.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Oxy-fuel combustion of pulverized fuels: Combustion fundamentals and modeling2016Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 162, s. 742-762Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Oxy-fuel combustion of pulverized fuels (PF), as a promising technology for CO2 capture from power plants, has gained a lot of concerns and also advanced considerable research, development and demonstration in the past years worldwide. The use of CO2 or the mixture of CO2 and H2O vapor as the diluent in oxy-fuel combustion, instead of N2 in conventional air-fuel combustion, induces significant changes to the combustion fundamentals, because of the great differences in the physical properties and chemical effects of the different diluents. Therefore, some fundamental issues and technological challenges need to be properly addressed to develop oxy-fuel combustion into an enabled technology. Computational Fluid Dynamics (CFD) modeling, which has been proven to be a very useful and cost-effective tool in research and development of conventional air-fuel combustion, is expected to play a similarly vital role in future development of oxy-fuel combustion technology. The paper presents a state-of-the-art review and an in-depth discussion of PF oxy-fuel combustion fundamentals and their modeling, which underpin the development of this promising technology. The focus is placed on the key issues in combustion physics (e.g., turbulent gas-solid flow, heat and mass transfer) and combustion chemistry (e.g., pyrolysis, gas phase combustion and char reactions), mainly on how they are affected in oxy-fuel conditions and how they are modeled and implemented into CFD simulations. The system performance of PF oxy-fuel combustion is also reviewed. Finally, the current status of PF oxy-fuel combustion fundamentals and modeling is concluded and the research needs in these regards are suggested. 

  • 636.
    Yu, A.
    et al.
    University of Waterloo, Canada.
    Chen, Z.
    University of Waterloo, Canada.
    Maric, R.
    University of Connecticut, United States.
    Zhang, L.
    National Research Council Canada, Canada.
    Zhang, J.
    National Research Council Canada, Canada.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Electrochemical supercapacitors for energy storage and delivery: Advanced materials, technologies and applications2015Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 153, s. 1-2Artikel i tidskrift (Refereegranskat)
  • 637.
    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%

  • 638.
    Zaccaria, Valentina
    et al.
    U.S. Department of Energy, US.
    Branum, Zachary
    Arizona State University, USA.
    Tucker, David
    U.S. Department of Energy, US.
    Fuel Cell Temperature Control with a Pre-Combustor in SOFC Gas Turbine Hybrids during Load Changes2017Ingår i: Journal of electrochemical energy conversion and storage, ISSN 2381-6872, Vol. 14, s. 031006-031014Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The use of high temperature fuel cells, such as Solid Oxide Fuel Cells (SOFCs), for power generation is considered a very efficient and clean solution to conservation of energy resources. When the SOFC is coupled with a gas turbine, the global system efficiency can go beyond 70% on natural gas LHV. However, durability of the ceramic material and system operability can be significantly penalized by thermal stresses due to temperature fluctuations and non-even temperature distributions. Thermal management of the cell during load following is therefore essential.The purpose of this work was to develop and test a pre-combustor model for real-time applications in hardware-based simulations, and to implement a control strategy to keep constant cathode inlet temperature during different operative conditions. The real-time model of the pre-combustor was incorporated into the existing SOFC model and tested in a hybrid system facility, where a physical gas turbine and hardware components were coupled with a cyber-physical fuel cell for flexible, accurate, and cost-reduced simulations.The control of the fuel flow to the pre-combustor was proven to be effective in maintaining a constant cathode inlet temperature during a step change in fuel cell load. With a 20 A load variation, the maximum temperature deviation from the nominal value was below 0.3% (3K). Temperature gradients along the cell were maintained below 10 K/cm. An efficiency analysis was performed in order to evaluate the impact of the pre-combustor on the overall system efficiency.

  • 639.
    Zaccaria, Valentina
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Cuneo, Alessandra
    University of Genoa, Italy.
    Sorce, Alessandro
    University of Genoa, Italy.
    Influence of multiple degrading components on fuel cell gas turbine hybrid systems lifetime2018Ingår i: Proceedings of GPPS Forum 18 Global Power and Propulsion Society Zurich, 10th-12th January 2018, 2018Konferensbidrag (Refereegranskat)
    Abstract [en]

    Energy system reliability and operational cost depend highly on the performance degradation experienced by system components. In complex systems, degradation of each single component affects matching and interactions of different system parts. Gas turbine fuel cell hybrid systems combine two different technologies to produce power with an extremely high conversion efficiency. Severe performance decay over time currently limits high temperature fuel cells lifetime; although at a different rate, gas turbine engines also experience gradual deterioration phenomena such as erosion, corrosion, and creep. This work aims at evaluating, for the first time, the complex performance interaction between degrading components in a hybrid system. The effect of deterioration in gas turbine pressure ratio and efficiency on fuel cell performance was analyzed, and at the same time, the impact of the degrading fuel cell thermal output on turbine blade aging was modeled to estimate a remaining useful lifetime.

  • 640.
    Zaccaria, Valentina
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Dik, Andreas
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Bitén, Nikolas
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Aslanidou, Ioanna
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Kyprianidis, Konstantinos
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Conceptual Design of a 3-Shaft Turbofan Engine with Reduced Fuel Consumption for 20252017Ingår i: Energy Procedia / [ed] Elsevier, 2017Konferensbidrag (Refereegranskat)
    Abstract [en]

    In the past decade, aircraft fuel burn has been continually decreased, mainly by improving thermal and propulsion efficiencies with consequent decrement in specific fuel consumption. In view of future emission specifications, the requirements for SFC in the forthcoming years are expected to become more stringent. In this paper, a preliminary design of a turbofan engine for entry in service in 2025 was performed. The design of a baseline 2010 EIS engine was improved according to 2025 specifications. A thermodynamic analysis was carried out to select optimal jet velocity ratio, pressure ratio, and temperatures with the goal of minimizing specific fuel consumption. A gas path layout was generated and an aerodynamic analysis was performed to optimize the engine stage by stage design. The optimization resulted in a 3-shaft turbofan jet engine with a 21% increase in fan diameter, a 2.2% increment in engine length, and a fuel burn improvement of 11% compared to the baseline engine, mainly due to an increment in propulsive efficiency. A sensitivity analysis was also conducted to highlight what the focus of technology development should be.

  • 641.
    Zaccaria, Valentina
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik.
    Ferrari, Mario
    University of Genoa.
    Kyprianidis, Konstantinos
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Adaptive Control of Micro Gas Turbine for Engine Degradation Compensation2019Ingår i: Journal of engineering for gas turbines and power, ISSN 0742-4795, E-ISSN 1528-8919, Vol. 3Artikel i tidskrift (Refereegranskat)
  • 642.
    Zaccaria, Valentina
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Rahman, Moksadur
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Kyprianidis, Konstantinos
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    A review of information fusion methodsfor gas turbine diagnostics2019Konferensbidrag (Refereegranskat)
    Abstract [en]

    ABSTRACT The correct and early detection of incipient faults or severe degradation phenomena in gas turbine systems is essential for safe and cost-effective operations. A multitude of monitoring and diagnostic systems have been developed and tested in the last decades. The current computational capability of modern digital systems has been exploited for both accurate physics-based methods and artificial intelligence or machine learning methods. However, progress is rather limited and none of the methods explored so far seems to be superior to others. One solution to enhance diagnostic systems exploiting the advantages of various techniques is to fuse the information coming from different tools, for example through statistical methods. Information fusion techniques such as Bayesian networks, fuzzy logic, or probabilistic neural networks can be used to implement a decision support system. This paper presents a comprehensive review of information and decision fusion methods applied to gas turbine diagnostics and the use of probabilistic reasoning to enhance diagnostic accuracy. The different solutions presented in the literature are compared and major challenges for practical implementation on an industrial gas turbine are discussed. Detecting and isolating faults in a system is a complex problem under many uncertainties including integrity of available information. The capability of different information fusion techniques to deal with uncertainty are also compared and discussed. Based on the lessons learned, new perspectives for diagnostics and decision support system are proposed.

  • 643.
    Zaccaria, Valentina
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Stenfelt, Mikael
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Sjunnesson, Anna
    Siemens Industrial Turbomachinery AB, Sweden.
    Andreas, Hansson
    Siemens Industrial Turbomachinery AB, Sweden.
    Kyprianidis, Konstantinos
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    A MODEL-BASED SOLUTION FOR GAS TURBINE DIAGNOSTICS: SIMULATIONS AND EXPERIMENTAL VERIFICATION2019Ingår i: Proceedings of the ASME Turbo ExpoVolume 6, 2019, 2019, artikel-id GT2019-90858Konferensbidrag (Refereegranskat)
    Abstract [en]

    Prompt detection of incipient faults and accurate monitoring of engine deterioration are key aspects for ensuring safe operations and planning a timely maintenance. Modern computing capabilities allow for more and more complex tools for engine monitoring and diagnostics. Nevertheless, an underlying physics-based approach is often preferable, because not only the “what” but also the “why” can be identified, providing an effective decision support tool to the service engineer. In this work, a physics-based adaptive model is used to evaluate performance deltas and correct the data to reference conditions (gas turbine load and ambient conditions), while a data-driven correlation algorithm identifies the most likely matches within a fault signatures database. Possible faults are ordered from the highest correlation in the decision support system and the most likely fault can be selected based on the number of occurrences and the associated correlation. Gradual engine degradation can also be monitored by displaying performance deltas trends during time. The diagnostics tool was tested on a validated performance model of a single-shaft industrial gas turbine and subsequently on experimental data. This paper presents the diagnostics system structure, the model adaptation scheme, and the results obtained from simulated and real fault data. Accurate fault isolation and severity identification were achieved in all cases, demonstrating the tool capability for decision support system.

  • 644.
    Zaccaria, Valentina
    et al.
    University of Genova, Italy.
    Traverso, Alberto
    University of Genova, Italy.
    Tucker, David
    U.S. Department of Energy, US.
    Advanced gas turbine hybrid power systems to improve SOFC economic viability2017Ingår i: Journal of the Global Power and Propulsion Society, ISSN 2515-3080, Vol. 1, s. 28-40Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Coupling a solid oxide fuel cell (SOFC) with a gas turbineprovides a substantial increment in system efficiency comparedto the separate technologies, which can potentiallyintroduce economic benefits and favor an early market penetrationof fuel cells. Currently, the economic viability of suchsystems is limited by fuel cell short lifetime due to a progressiveperformance degradation that leads to cell failure.Mitigating these phenomena would have a significant impacton system economic feasibility. In this study, the lifetime of astandalone, atmospheric SOFC system was compared to apressurized SOFC gas turbine hybrid and an economic analysiswas performed. In both cases, the power production wasrequired to be constant over time, with significantly differentresults for the two systems in terms of fuel cell operating life,system efficiency, and economic return. In the hybrid system,an extended fuel cell lifetime is achieved while maintaininghigh system efficiency and improving economic performance.In this work, the optimal power density was determined forthe standalone fuel cell in order to have the best economicperformance. Nevertheless, the hybrid system showed bettereconomic performance, and it was less affected by the stackcost.

  • 645.
    Zaccaria, Valentina
    et al.
    U.S. Department of Energy, United States.
    Tucker, David
    U.S. Department of Energy, United States.
    Traverso, Alberto
    University of Genoa, Italy.
    Transfer function development for SOFC/GT hybrid systems control using cold air bypass2016Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 165, s. 695-706Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Fuel cell gas turbine hybrids present significant challenges in terms of system control because of the couplingof different time-scale phenomena. Hence, the importance of studying the integrated systemdynamics is critical. With the aim of safe operability and efficiency optimization, the cold air bypass valvewas considered an important actuator since it affects several key parameters and can be very effective incontrolling compressor surge. Two different tests were conducted using a cyber-physical approach. TheHybrid Performance (HyPer) facility couples gas turbine equipment with a cyber physical solid oxide fuelcell in which the hardware is driven by a numerical fuel cell model operating in real time. The tests wereperformed moving the cold air valve from the nominal position of 40% with a step of 15% up and down,while the system was in open loop, i.e. no control on turbine speed or inlet temperature. The effect of thevalve change on the system was analyzed and transfer functions were developed for several importantvariables such as cathode mass flow, total pressure drop and surge margin. Transfer functions can showthe response time of different system variables, and are used to characterize the dynamic response of theintegrated system. Opening the valve resulted in an immediate positive impact on pressure drop andsurge margin. A valve change also significantly affected fuel cell temperature, demonstrating that the coldair bypass can be used for thermal management of the cell.

  • 646.
    Zachos, Pavlos K.
    et al.
    Cranfield University, United Kingdom.
    Aslanidou, Ioanna
    Cranfield University, United Kingdom.
    Pachidis, Vassilios
    Cranfield University, United Kingdom.
    Singh, Riti
    Cranfield University, United Kingdom.
    A sub-idle compressor characteristic generation method with enhanced physical background2011Ingår i: Journal of engineering for gas turbines and power, ISSN 0742-4795, E-ISSN 1528-8919, Vol. 133, nr 8Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Sub-idle is a very challenging operating region as the performance of a gas turbineengine changes significantly compared with design conditions. In addition, the regulationsfor new and existing engines are becoming stricter and the prediction of enginerelight capability is essential. In order to predict the performance of an engine, detailedcomponent maps are required. The data obtained from rig tests are insufficient at lowspeeds, creating the need for generation of maps within the sub-idle regime. The first steptoward this direction is the use of an extrapolation process. This is a purely mathematicalprocess and the results are not usually of sufficient accuracy. In addition, this methoddoes not provide any insight on the physical phenomena governing the operation of thecompressor at low speeds. The accuracy of the resulting compressor map can be increasedwith a better low speed region definition; this can be achieved via the thoroughstudy of a locked rotor compressor, enabling the derivation of the zero rotational speedline and allowing an interpolation process for the generation of the low speed part of thecharacteristic. In this work, an enhanced sub-idle compressor map generation techniqueis proposed. The suggested methodology enables the generation of characteristics at faroff-design conditions with enhanced physical background. Alternative parameters formap representation are also introduced. Provided that the all the blade rows of thecompressor are of known geometry, a numerical analysis is used for the calculation of thecharacteristic of the half stage and a stage stacking method is employed to create theentire compressor characteristic. This way, the sub-idle region of the map can be calculatedthrough interpolation, which provides a more accurate and predictive technique.Application of the method for compressor map generation showed that the proposedinterpolation approach is robust and capable of enhancing any performance simulationtool used for the prediction of transient altitude relight or ground-starting maneuvers.

  • 647.
    Zainali, Sebastian
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik. 1995.
    Osbeck, Sofia
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik.
    FEASIBILITY OF USING LITHIUM-ION BATTERIES FOR LOAD SHIFTING: A thesis study that analyze the performance and economic feasibilities for an air compressor with a battery system2019Självständigt arbete på grundnivå (yrkesexamen), 180 hpStudentuppsats (Examensarbete)
    Abstract [en]

    The electricity price changes depending on the time of the day in most countries. In Sweden there is a spot price that changes every hour while China uses Time of Use (ToU) tariff. To avoid the most expensive hours this degree project investigates the feasibility of using lithium- ion batteries to shift the load of an industrial air compressor. The Depth of Discharge and the State of Charge (SoC) for the battery are analyzed to find the optimal use of the battery. Through simulations in MATLAB the degradation-curve and State of Charge were analyzed, which was further used for economics analysis. The feasibility of the system is evaluated by using payback time and Net Present Value (NPV). Results show that a battery has a slightly longer lifetime when it is working in a SoC of 50-70%, but a larger SoC is more profitable from the perspective of NPV. For the SoC of 0-100%, the NPV is about ~9683 US$. Compared to Sweden, using batteries to shift load is more profitable in China, which is mainly due to the high electricity prices. For the same air compressor, the payback time is 5 and 15 years for the investment of batteries in China and Sweden respectively.

  • 648.
    Zeng, Lei
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    A Policy Analytical Approach of Assessing Energy Efficiency Standards and Labeling for Appliances2015Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    China is the world’s largest producer and consumer of household appliances, lighting and commercial equipment. China first adopted Minimum Energy Performance Standards (MEPS) in 1989. By 2013, China has developed and implemented 52 Energy Efficiency Standards (EES) and 28 mandatory energy labels for a wide range of domestic, commercial, and selected industrial equipment. However, despite of the large number of standards issued, big challenges remain with how to ensure the standards keep up with the dynamic evolvement of technologies and appliance market after they enter effect.

    The current policy analysis methods adopted by the policy makers primarily focuses on standards making process and very limited attentions were paid on impact assessment and ex-post evaluation of standards and labeling systems, hence the effectiveness of active Energy Efficiency Standards has not been assessed timely and comprehensively. One major barrier of this is the lacking of assessment methods and market data.

    This thesis intends to tackle the above issues by developing a new policy analysis approach that can be used to assess the impact of energy efficiency standards and labeling with market data. This approach adopts a comprehensive analysis method that comprises three components: (1) Analysis of market data; (2) Quantification of energy savings potential; and (3) Benchmarking China’s EE standards to those of peer economies around the world. This integrated approach leads to three independent but complementary studies that provide evidence-based findings and policy recommendations for the improvement of China’s appliance standards.

  • 649.
    Zeng, Lei
    et al.
    CLASP China, Chaoyang, Beijing, China.
    Li, J.
    CLASP China, Chaoyang, Beijing, China.
    Yu, Y.
    CLASP China, Chaoyang, Beijing, China.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Developing a products prioritization tool for energy efficiency standards improvements in China2014Ingår i: Energy Procedia, 2014, s. 2275-2279Konferensbidrag (Refereegranskat)
    Abstract [en]

    China is the world's largest producer and consumer of household appliances, lighting and other residential and commercial equipment. Since 1989, China has developed and implemented over 40 energy efficiency (EE) standards and over 20 mandatory energy labels for a wide range of domestic, commercial and selected industrial equipment. However, there are tremendous opportunities to capture additional savings through more stringent energy efficiency policies for major energy-consuming appliances. To assess the stringency of EE standards, this paper developed an integrated products prioritization tool for energy efficiency standards improvements that comprises three component analyses: (1) analysis of market data, (2) quantification of energy savings potential, and (3) benchmarking China's EE standards to those of peer economies around the world. This integrated approach led to three independent but complementary studies, and an comprehensive analysis that resulted in a coherent set of policy recommendations on what products to prioritize for China's energy efficiency standards revisions, in order to maximize their energy savings.

  • 650.
    Zeng, Lei
    et al.
    Mälardalens högskola, Institutionen för samhällsteknik.
    Wang, Chuan
    Yan, Jinyue
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Develop Landfill Gas-to-Energy Project under CDM in ChinaManuskript (Övrigt vetenskapligt)
1011121314 601 - 650 av 689
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