Question: 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

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 for a refrigeration rate of 1 ton and
(c) The COP.

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