Parametric Optimization and Thermo-Economic Analyses of Geothermal ORCs Using HFOs as the Working Fluids
A thermo-economic model was used to analyze the thermodynamic and economic char-acteristics of a geothermal ORC system.The evaporation and condensation temperatures of typical hydrofluoroolefins(HFOs)working fluids including R1224yd(Z),R1233zd(E)and R1336mzz(Z)were optimized to obtain the maximum net power.The thermo-economic characteristics were analyzed and compared with the traditional working fluids R601,R601a and R245fa.The results show that the evaporation and condensation parameters of R1224yd(Z)and R245fa are close under the optimal conditions.When the geothermal water inlet temperature is lower than 130℃,the net output power of R1336mzz(Z)is the maximum among the selected fluids,which is 1.47％～1.89％more than that of R1233zd(E);but the heat exchanger area increases by more than 17％.When the geothermal water inlet temperature is higher than 130℃,the net output power of R245fa is the maximum,and the power generation cost is reduced by 15.5％～16.8％compared with R1336mzz(Z).
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