Study of zeotropic mixtures of ORC (organic Rankine cycle) under engine various operating conditions

Kai Yang, Hongguang Zhang, Zhen Wang, Jian Zhang, Fubin Yang, Enhua Wang and Baofeng Yao

Energy, 2013, vol. 58, issue C, 494-510

Abstract: Aiming at the recovery of exhaust energy for a diesel engine, a set of ORC (organic Rankine cycle) system is designed. The characteristics of the exhaust gas under various operating conditions are studied through experiment. Based on experimental results and theoretical calculation, effects of eight kinds of zeotropic mixtures on the performance of ORC system for exhaust energy recovery are discussed for vehicle engine under various operating conditions. Variation of net power output, thermal efficiency, exergy efficiency of ORC system and mass flow rate of zeotropic mixture under various operating conditions of engine is investigated. Two concepts – WHRE (waste heat recovery efficiency) and POIR (power output increasing rate) – are defined and studied. The results show that when the evaporating pressure is 2.0 MPa, the net power output of ORC system can reach up to 24.65 kW. Using this ORC system, the maximum WHRE is 8.5% and engine power output can be increased by 10.63%.

Keywords: Vehicle diesel engine; Waste heat recovery; Organic Rankine cycle; Various operating conditions; Zeotropic mixtures (search for similar items in EconPapers)
Date: 2013
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (34)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:58:y:2013:i:c:p:494-510

DOI: 10.1016/j.energy.2013.04.074

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