Entropy, Entransy and Exergy Analysis of a Dual-Loop Organic Rankine Cycle (DORC) Using Mixture Working Fluids for Engine Waste Heat Recovery

Shuang Wang, Wei Zhang, Yong-Qiang Feng, Xin Wang, Qian Wang, Yu-Zhuang Liu, Yu Wang and Lin Yao
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Shuang Wang: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Wei Zhang: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Yong-Qiang Feng: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Xin Wang: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Qian Wang: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Yu-Zhuang Liu: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Yu Wang: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Lin Yao: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China

Energies, 2020, vol. 13, issue 6, 1-25

Abstract: The exergy, entropy, and entransy analysis for a dual-loop organic Rankine cycle (DORC) using a mixture of working fluids have been investigated in this study. A high-temperature (HT) loop was used to recover waste heat from internal combustion engine in 350 °C, and a low-temperature loop (LT) was used to absorb residual heat of engine exhaust gas and HT loop working fluids. Hexane/toluene, cyclopentane/toluene, and R123/toluene were selected as working fluid mixtures for HT loop, while R245fa/pentane was chosen for LT loop. Results indicated that the variation of entropy generation rate, entransy loss, entransy efficiency, and exergy loss are insensitive to the working fluids. The entransy loss rate and system net power output present the same variation trends, whereas a reverse trend for entropy generation rate and entransy efficiency, while the exergy analysis proved to be only utilized under fixed stream conditions. The results also showed that hexane/toluene is the preferred mixture fluid for DORC.

Keywords: dual-loop ORC; mixture working fluids; entropy generation; entransy loss; exergy loss (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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