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A gas refrigeration system uses helium as the working fluid operates with a pressure ratio of 3.5. The temperature of the helium is -10oC at the compressor inlet and 50oC at the turbine inlet. Assuming an adiabatic efficiency of 80% for both the compressor and the turbine, determine (a) the minimum temperature of the cycle, (b) mass flow rate (m) for a refrigeration rate of 1 ton and (c) the COP. (d) What would the COP be if the adiabatic efficiency increased to 85%?
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