A gas refrigeration cycle with a pressure ratio of 3 uses helium as the working fluid. The

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A gas refrigeration cycle with a pressure ratio of 3 uses helium as the working fluid. The temperature of the helium is -15oC at the compressor inlet at 50oC at the turbine inlet. Assuming adiabatic efficiencies of 85% for both the turbine and the compressor, determine (a) The minimum temperature in the cycle,
(b) The mass flow rate of the helium for a refrigeration rate of 10 kW.
(c) The coefficient of performance (COPR) and
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