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Thermodynamic Analysis of a Rankine Cycle Powered Refrigeration System using Low-Temperature Geothermal Energy
Received date: 2014-03-05
Revised date: 2014-04-23
Online published: 2014-04-30
To efficiently utilize low-temperature geothermal energy, 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. The overall COP and working fluid mass flow rate of per kW cooling capacity are chosen as key performance indicators. The calculated results show that R601 is the best working fluid for the ORC-VCR system as the geothermal water temperature is between 60oC and 90oC, the condensation temperature ranges from 30oC to 55oC and the evaporation temperature varies from 30oC to 55oC. When the geothermal water temperature reaches 90oC and the other input parameters are in typical values, the overall COP of the R601 case reaches 0.49.
HU Bing , MA Wei-bin . Thermodynamic Analysis of a Rankine Cycle Powered Refrigeration System using Low-Temperature Geothermal Energy[J]. Advances in New and Renewable Energy, 2014 , 2(2) : 122 -128 . DOI: 10.3969/j.issn.2095-560X.2014.02.007
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