期刊
THERMAL SCIENCE
卷 25, 期 1, 页码 767-779出版社
VINCA INST NUCLEAR SCI
DOI: 10.2298/TSCI200507296H
关键词
organic flash cycle; internal heat exchanger; zeotropic mixtures; thermal efficiency
资金
- Yunnan Provincial Department of Education Science Research Fund Project [2019J0025, 2018JS551]
- Talent Project of Yunnan University [C176220200]
- Scientific Research Foundation of Kunming Metallurgy College [Xxrcxm201802]
- National Natural Science Foundation Programs of China [51736005, 51878591]
The thermal performance of an internal heat exchanger-organic flash cycle system driven by geothermal water was investigated in this study. Results showed that using R600a/R601a mixtures (0.7/0.3) led to the largest net power output, and the internal heat exchanger can improve the thermal efficiency of the organic flash cycle.
In this study, the thermal performance of an internal heat exchanger-organic flash cycle system driven by geothermal water was investigated. The R600a/R601a mixtures were selected as the working fluid. The effects of the mole fraction of mixtures on the heat absorption capacity of the heater, the temperature rise of cold working fluid in the internal heat exchanger, net power output, thermal efficiency, and electricity generation costs were analyzed. The net power outputs, electricity generation costs, and thermal efficiency of the internal heat exchanger-organic flash cycle and simple organic flash cycle systems were compared. Results showed that the system using the R600a/R601a mixtures (0.7/0.3 mole fraction) has the largest net power output, which increased the net power output by 3.68% and 42.23% over the R601a and R600a systems, respectively. When the R600a mole fraction was 0.4, the electricity generation costs reduction of the internal heat exchanger-organic flash cycle system was the largest (1.77% compared with the simple organic flash cycle system). The internal heat exchanger can increase the thermal efficiency of organic flash cycle, but the net power output does not necessarily increase.
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