Energies 2012, 5(9), 3233-3247; doi:10.3390/en5093233
Article

Performance Analysis and Working Fluid Selection of a Supercritical Organic Rankine Cycle for Low Grade Waste Heat Recovery

Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education, College of Power Engineering, Chongqing University, Chongqing 400030, China
* Author to whom correspondence should be addressed.
Received: 10 July 2012; in revised form: 15 August 2012 / Accepted: 23 August 2012 / Published: 30 August 2012
(This article belongs to the Special Issue Waste to Energy Technologies)
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Abstract: The performance analysis of a supercritical organic Rankine cycle system driven by exhaust heat using 18 organic working fluids is presented. Several parameters, such as the net power output, exergy efficiency, expander size parameter (SP), and heat exchanger requirement of evaporator and the condenser, were used to evaluate the performance of this recovery cycle and screen the working fluids. The results reveal that in most cases, raising the expander inlet temperature is helpful to improve the net power output and the exergy efficiency. However, the effect of the expander inlet pressure on those parameters is related to the expander inlet temperature and working fluid used. Either lower expander inlet temperature and pressure, or higher expander inlet temperature and pressure, generally makes the net power output more. Lower expander inlet temperature results in larger total heat transfer requirement and expander size. According to the screening criteria of both the higher output and the lower investment, the following working fluids for the supercritical ORC system are recommended: R152a and R143a.
Keywords: supercritical organic Rankine cycle; net power output; exergy efficiency; expander size parameter

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MDPI and ACS Style

Gao, H.; Liu, C.; He, C.; Xu, X.; Wu, S.; Li, Y. Performance Analysis and Working Fluid Selection of a Supercritical Organic Rankine Cycle for Low Grade Waste Heat Recovery. Energies 2012, 5, 3233-3247.

AMA Style

Gao H, Liu C, He C, Xu X, Wu S, Li Y. Performance Analysis and Working Fluid Selection of a Supercritical Organic Rankine Cycle for Low Grade Waste Heat Recovery. Energies. 2012; 5(9):3233-3247.

Chicago/Turabian Style

Gao, Hong; Liu, Chao; He, Chao; Xu, Xiaoxiao; Wu, Shuangying; Li, Yourong. 2012. "Performance Analysis and Working Fluid Selection of a Supercritical Organic Rankine Cycle for Low Grade Waste Heat Recovery." Energies 5, no. 9: 3233-3247.

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