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In this study, the thermal performance of an internal heat exchanger-organic  flash cycle system driven by geothermal water was investigated.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 theR600a/R601a  mixtures (0.7/0.3mole 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. WhentheR600a 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.

Thermal performance analysis of organic flash cycle using R600A/R601A mixtures with internal heat exchanger