Parametric and working fluid analysis of a dual-loop organic Rankine cycle (DORC) used in engine waste heat recovery
作者： Gequn Shu , Lina Liu , Hua Tian , Haiqiao Wei , Guopeng Yu
DOI: 10.1016/J.APENERGY.2013.08.027
关键词: Waste heat recovery unit 、 Exergy efficiency 、 Coolant 、 Working fluid 、 Waste heat 、 Exergy 、 Thermodynamics 、 Thermal efficiency 、 Organic Rankine cycle 、 Engineering 、 Process engineering
摘要: A novel dual-loop organic Rankine cycle (DORC) is proposed in this study, which consists a high-temperature (HT) loop and low-temperature (LT) to recover the waste heat of exhaust, engine coolant residual HT loop. Net output power, utilization rate coolant, DORC thermal efficiency exergy are chosen as objective functions. R124, R134a, R245fa, R600, R600a R1234yf candidate working fluids LT Based on data pre-set model parameters, energy analysis conducted. Results show that maximum net obtained with at Tevp,HT = 570 K Tevp,LT 343 corresponding values 36.77 kW, 96.8% 55.05%. The top two ηth R600 R245fa 365 20.07% 20.06%. Furthermore, based R1234yf-based system operating K, irreversibility occurs turbine evaporator E3,LT worst, optimization objectives for improvement performance. In addition, Pnet, ηe, all fluids, performs better high load. found be fluid R124 possesses worst performance under loads.
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