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Energies 2014, 7(4), 2123-2145; doi:10.3390/en7042123
Article

Effects of Degree of Superheat on the Running Performance of an Organic Rankine Cycle (ORC) Waste Heat Recovery System for Diesel Engines under Various Operating Conditions

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Received: 26 January 2014; in revised form: 18 March 2014 / Accepted: 18 March 2014 / Published: 1 April 2014
(This article belongs to the Special Issue Waste Heat Recovery—Strategy and Practice)
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Abstract: This study analyzed the variation law of engine exhaust energy under various operating conditions to improve the thermal efficiency and fuel economy of diesel engines. An organic Rankine cycle (ORC) waste heat recovery system with internal heat exchanger (IHE) was designed to recover waste heat from the diesel engine exhaust. The zeotropic mixture R416A was used as the working fluid for the ORC. Three evaluation indexes were presented as follows: waste heat recovery efficiency (WHRE), engine thermal efficiency increasing ratio (ETEIR), and output energy density of working fluid (OEDWF). In terms of various operating conditions of the diesel engine, this study investigated the variation tendencies of the running performances of the ORC waste heat recovery system and the effects of the degree of superheat on the running performance of the ORC waste heat recovery system through theoretical calculations. The research findings showed that the net power output, WHRE, and ETEIR of the ORC waste heat recovery system reach their maxima when the degree of superheat is 40 K, engine speed is 2200 r/min, and engine torque is 1200 N·m. OEDWF gradually increases with the increase in the degree of superheat, which indicates that the required mass flow rate of R416A decreases for a certain net power output, thereby significantly decreasing the risk of environmental pollution.
Keywords: diesel engine; organic Rankine cycle (ORC); waste heat recovery; degree of superheat; various operating conditions diesel engine; organic Rankine cycle (ORC); waste heat recovery; degree of superheat; various operating conditions
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.

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MDPI and ACS Style

Yang, K.; Zhang, H.; Song, S.; Yang, F.; Liu, H.; Zhao, G.; Zhang, J.; Yao, B. Effects of Degree of Superheat on the Running Performance of an Organic Rankine Cycle (ORC) Waste Heat Recovery System for Diesel Engines under Various Operating Conditions. Energies 2014, 7, 2123-2145.

AMA Style

Yang K, Zhang H, Song S, Yang F, Liu H, Zhao G, Zhang J, Yao B. Effects of Degree of Superheat on the Running Performance of an Organic Rankine Cycle (ORC) Waste Heat Recovery System for Diesel Engines under Various Operating Conditions. Energies. 2014; 7(4):2123-2145.

Chicago/Turabian Style

Yang, Kai; Zhang, Hongguang; Song, Songsong; Yang, Fubin; Liu, Hao; Zhao, Guangyao; Zhang, Jian; Yao, Baofeng. 2014. "Effects of Degree of Superheat on the Running Performance of an Organic Rankine Cycle (ORC) Waste Heat Recovery System for Diesel Engines under Various Operating Conditions." Energies 7, no. 4: 2123-2145.


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