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Entropy 2017, 19(6), 256; doi:10.3390/e19060256

The Exergy Loss Distribution and the Heat Transfer Capability in Subcritical Organic Rankine Cycle

Key Laboratory of New Materials and Facilities for Rural Renewable Energy, Ministry of Agriculture, Collaborative Innovation Center of Biomass Energy, College of Mechanical & Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China
Authors to whom correspondence should be addressed.
Academic Editors: Pouria Ahmadi and Behnaz Rezaie
Received: 28 March 2017 / Revised: 18 May 2017 / Accepted: 31 May 2017 / Published: 3 June 2017
(This article belongs to the Special Issue Work Availability and Exergy Analysis)
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Taking net power output as the optimization objective, the exergy loss distribution of the subcritical Organic Rankine Cycle (ORC) system by using R245fa as the working fluid was calculated under the optimal conditions. The influences of heat source temperature, the evaporator pinch point temperature difference, the expander isentropic efficiency and the cooling water temperature rise on the exergy loss distribution of subcritical ORC system are comprehensively discussed. It is found that there exists a critical value of expander isentropic efficiency and cooling water temperature rise, respectively, under certain conditions. The magnitude of critical value will affect the relative distribution of exergy loss in the expander, the evaporator and the condenser. The research results will help to better understand the characteristics of the exergy loss distribution in an ORC system. View Full-Text
Keywords: subcritical organic rankine cycle; exergy loss; expander isentropic efficiency subcritical organic rankine cycle; exergy loss; expander isentropic efficiency

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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He, C.; Jiao, Y.; Tian, C.; Wang, Z.; Zhang, Z. The Exergy Loss Distribution and the Heat Transfer Capability in Subcritical Organic Rankine Cycle. Entropy 2017, 19, 256.

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