Thermo-Economic Performance Analysis of a Novel Organic Flash Rankine Cycle Using R600/R245fa Mixtures

Guangbiao Fu, Songyuan Zhang, Zhong Ge (), Jian Li (), Jian Xu, Jianbin Xie, Zhiyong Xie, Dong Yao, Tao Zhao, Zhijie Wang, Shuaikun Yue, Siyu Zhao, Fanhan Liu and Qiuping Jiang
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Guangbiao Fu: School of Architecture and Urban Planning, Yunnan University, Kunming 650504, China
Songyuan Zhang: Faculty of Metallurgical and Mining, Kunming Metallurgy College, Kunming 650033, China
Zhong Ge: School of Architecture and Urban Planning, Yunnan University, Kunming 650504, China
Jian Li: School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Jian Xu: School of Architecture and Urban Planning, Yunnan University, Kunming 650504, China
Jianbin Xie: School of Architecture and Urban Planning, Yunnan University, Kunming 650504, China
Zhiyong Xie: School of Architecture and Urban Planning, Yunnan University, Kunming 650504, China
Dong Yao: School of Architecture and Urban Planning, Yunnan University, Kunming 650504, China
Tao Zhao: School of Architecture and Urban Planning, Yunnan University, Kunming 650504, China
Zhijie Wang: School of Architecture and Urban Planning, Yunnan University, Kunming 650504, China
Shuaikun Yue: School of Architecture and Urban Planning, Yunnan University, Kunming 650504, China
Siyu Zhao: School of Architecture and Urban Planning, Yunnan University, Kunming 650504, China
Fanhan Liu: College of Civil Engineering and Architecture, Jiaxing University, Jiaxing 314001, China
Qiuping Jiang: School of Architecture and Urban Planning, Yunnan University, Kunming 650504, China

Energies, 2022, vol. 15, issue 21, 1-19

Abstract: The organic flash cycle (OFC) is a novel power cycle with small exergy loss in the endothermic process. However, the low-pressure throttle valve in the cycle has a large throttling loss. Aiming to reduce the cycle exergy loss and improve the system performance, this study constructs a new configuration named the organic flash Rankine cycle (OFRC). Using the R600/R245fa mixture as the circulating working fluid and 200 °C geothermal water as the heat source, the effects of the change in working fluid composition on the thermal properties of the OFRC were studied based on the first and second laws of thermodynamics. Then, the economic performance of the proposed OFRC was investigated and then compared with that of the conventional OFC. The results show that the OFRC system has a significant improvement in thermal performance and economy compared with the OFC system. When the mole composition of the R600/R245fa mixture is 0.5/0.5, the net output work, thermal efficiency, and exergy efficiency of the OFRC system can reach a maximum at 146.39 kW, 21.51%, and 80.94%, respectively, which are 98.2 kW, 14.43%, and 54.3% higher than those of the OFC system. The dual heaters in the OFRC system can effectively reduce loss in the endothermic process. When the R600 mole composition is 0.5 in the OFRC system, the exergy loss of the heater is only 7.42%, and the power generation cost (0.3267 $·kW −1 ·h −1 only) is lower than that in the OFC system.

Keywords: organic flash cycle; thermal performance; exergy analysis; economics; mixed working fluid (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: 2022
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