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A refrigerator using Helium Gas operates on a reversed Brayton Cycle with a pressure ratio of...

A refrigerator using Helium Gas operates on a reversed Brayton Cycle with a pressure ratio of 5. Prior to compression the gas occupies 100cm3 at a pressure of 150kPa and a temperature of -23degC. The volume at the end of the expansion is 80cm3. What is the refrigerators CoP and its power input if it operates at 60 cycles per second ?

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