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The steady thermodynamics of a flash-binary geothermal power system based on correction models validated by static tests

Luo Chao (Key Laboratory of Efficient Utilization of Low and Medium Grade Energy (Tianjin University), Ministry of Education, Tianjin, China + Guangzhou Institute of Energy Conversion，Chinese Academy of Sciences，Guangzhou，Guangdong, China + Key Laboratory of Renewa)
Zhao Jun (Key Laboratory of Efficient Utilization of Low and Medium Grade Energy (Tianjin University), Ministry of Education, Tianjin, China)
Yin Hongmei (Key Laboratory of Efficient Utilization of Low and Medium Grade Energy (Tianjin University), Ministry of Education, Tianjin, China)
An Qingsong (Key Laboratory of Efficient Utilization of Low and Medium Grade Energy (Tianjin University), Ministry of Education, Tianjin, China)
Gong Yulie (Guangzhou Institute of Energy Conversion，Chinese Academy of Sciences，Guangzhou，Guangdong, China + Key Laboratory of Renewable Energy，Chinese Academy of Sciences，Guangzhou，Guangdong, China + Guangdong Provincial Key Laboratory of New and Renewable Energy R)

The operation parameters and performance of a flash-binary power system are analyzed based on four scenarios of the experiment, optimum design, error correction Model 1 and error correction Model 2. The operation parameters of a flash-binary power system are tested to explain steady in the experiment with heat source temperature ranges from 100-150°C. The results show that the simulation data of error correction Model 2 have a good agreement with the experiment and most parameter values of relative error, δ, are less than 5%. The expander with low isotropic efficiency results in the largest exergy losses in the flash-binary power system. The flash-binary power system has better performance to adapt to the mid-high temperature geothermal resource in China. Some valuable data obtained from the research can be applied in the future power plant construction in China’s southern Tibet, western Yunnan and Sichuan.

Keywords: mid-high geothermal resource, flash-binary system, exergy losses, steady and thermodynamics