Abstract
To efficiently utilize mid-ow temperature geothermal sources, an organic Rankine cycle-vapor compression refrigeration (ORC/VCR) system was employed and a thermodynamic model was developed. Six working fluids of R290, R600, R600a, R601, R601a and R1270 were analyzed and evaluated in order to identify suitable working fluids which may yield high system efficiencies.,and system design and influencing factors were researched with the overall COP and working fluid mass flow rate of per kW cooling capacity as key performance indicators.The results show that R601 is the best working fluid for the ORC/VCR system as the geothermal water temperature is between 60 to 90 °C, When the geothermal water temperature reaches 90 °C and the other input parameters are in typical values, the overall COP of the R601 case reaches 0.48.
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