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A gas refrigeration cycle with a pressure ratio of 4 uses helium as the working fluid....

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Mechanical Engineering

A gas refrigeration cycle with a pressure ratio of 4 uses heliumas the working fluid. The temperature of the helium is -6°C at thecompressor inlet and 50°C at the turbine inlet. Assume isentropicefficiencies of 88 percent for both the turbine and thecompressor.

(Given: The properties of helium are cp=5.1926 kJ/kg·K and k = 1.667.)

FIND:

a. The minimum temperature of the cycle.

b. The coefficient of performance.

c. the mass flow rate of the helium.

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