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Review of computational heat and mass transfer modeling in polymer-electrolyte-membrane (PEM) fuel cells
Siegel, C. - In: Energy 33 (2008) 9, pp. 1331-1352
-dimensional, large-scale setups, is presented with an emphasis on heat and mass transfer. Modeling strategies and commonly used … partial differential equations. Finally, an overview of commonly used simulation software for fuel cell modeling is given. A … simple case study is presented throughout this review to support and to illustrate several discussed aspects. The paper …
Persistent link: https://www.econbiz.de/10010808232
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Heat transfer design in adsorption refrigeration systems for efficient use of low-grade thermal energy
Wang, R.Z.; Xia, Z.Z.; Wang, L.W.; Lu, Z.S.; Li, S.L.; … - In: Energy 36 (2011) 9, pp. 5425-5439
Adsorption refrigeration and heat pump systems have been considered as important means for the efficient use of low-grade thermal energy of 60–150°C. Sorption systems are merely thermodynamic systems based on heat exchangers, and therefore a good design to optimize heat and mass transfer with...
Persistent link: https://www.econbiz.de/10011053538
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Efficiency optimization potential in supercritical Organic Rankine Cycles
Schuster, A.; Karellas, S.; Aumann, R. - In: Energy 35 (2010) 2, pp. 1033-1039
Nowadays, the use of Organic Rankine Cycle (ORC) in decentralised applications is linked with the fact that this process allows the use of low temperature heat sources and offers an advantageous efficiency in small-scale concepts. Many state-of-the-art and innovative applications can...
Persistent link: https://www.econbiz.de/10010807380
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The environmental impact of organic Rankine cycle for waste heat recovery through life-cycle assessment
Liu, Chao; He, Chao; Gao, Hong; Xie, Hui; Li, Yourong; … - In: Energy 56 (2013) C, pp. 144-154
The LCA (life-cycle assessment) was applied to evaluate EI (the environmental impact) of ORCPW (organic Rankine cycle power-plant for waste-heat-recovery) in this paper. The model of LCA on the ORCPW was established. The life-cycle of ORCPW was divided into construction, operation and...
Persistent link: https://www.econbiz.de/10010807644
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Analysis and optimization of cascade Rankine cycle for liquefied natural gas cold energy recovery
Choi, In-Hwan; Lee, Sangick; Seo, Yutaek; Chang, Daejun - In: Energy 61 (2013) C, pp. 179-195
This study proposes a new concept called the cascade Rankine cycle, which recovers LNG (liquefied natural gas) cold energy for power generation, optimizes the cycle by investigating the effects of key parameters on its performance, and compares its thermal efficiency, exergy efficiency and...
Persistent link: https://www.econbiz.de/10010807712
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A study of organic working fluids on system efficiency of an ORC using low-grade energy sources
Hung, T.C.; Wang, S.K.; Kuo, C.H.; Pei, B.S.; Tsai, K.F. - In: Energy 35 (2010) 3, pp. 1403-1411
Rankine cycles using organic fluids (as categorized into three groups: wet, dry, and isentropic fluids) as working fluids in converting low-grade energy are investigated in this study. The main purpose is to identify suitable working fluids which may yield high system efficiencies in an organic...
Persistent link: https://www.econbiz.de/10010807874
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Utilization of carbon dioxide from coal-based power plants as a heat transfer fluid for electricity generation in enhanced geothermal systems (EGS)
Ram Mohan, Arun; Turaga, Uday; Shembekar, Vishakha; … - In: Energy 57 (2013) C, pp. 505-512
The feasibility of using carbon dioxide (CO2) as a heat transfer fluid by organic Rankine cycle (ORC) in enhanced geothermal systems (EGS) in arid regions is explored in this paper. As CO2 is available for sequestration at high pressures from an Integrated Gasification Combined Cycle (IGCC)...
Persistent link: https://www.econbiz.de/10010808033
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Fundamental experiment of pumpless Rankine-type cycle for low-temperature heat recovery
Yamada, Noboru; Minami, Takahiro; Mohamad, Anuar; Nor, Md - In: Energy 36 (2011) 2, pp. 1010-1017
This paper proposes a new pumpless Rankine-type cycle for power generation from low-temperature heat sources. The new cycle mainly consists of an expander, two heat exchangers, and switching valves for the expander and heat exchangers. Instead of using a working fluid pump, the switching valves...
Persistent link: https://www.econbiz.de/10010808152
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Study of working fluid selection of organic Rankine cycle (ORC) for engine waste heat recovery
Wang, E.H.; Zhang, H.G.; Fan, B.Y.; Ouyang, M.G.; Zhao, Y. - In: Energy 36 (2011) 5, pp. 3406-3418
Organic Rankine Cycle (ORC) could be used to recover low-grade waste heat. When a vehicle is running, the engine exhaust gas states have a wide range of variance. Defining the operational conditions of the ORC that achieve the maximum utilization of waste heat is important. In this paper the...
Persistent link: https://www.econbiz.de/10010808792
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Modeling and constrained multivariable predictive control for ORC (Organic Rankine Cycle) based waste heat energy conversion systems
Zhang, Jianhua; Zhou, Yeli; Wang, Rui; Xu, Jinliang; … - In: Energy 66 (2014) C, pp. 128-138
In this paper, the structure and control tasks are briefly summarized for ORC (Organic Rankine Cycle) based WHECSs (waste heat energy conversion systems). A control-oriented physical model is established for WHECSs. The energy conversion efficiency of ORC systems is investigated. A constrained...
Persistent link: https://www.econbiz.de/10010809125