A refrigerator using helium gas operates on a reversed
Chapter 21, Problem 21.11(choose chapter or problem)
A refrigerator using helium gas operates on a reversed Brayton cycle with a pressure ratio of 5.0. Prior to compression, the gas occupies 100 cm3 at a pressure of 150 kPa and a temperature of -23C. Its volume at the end of the expansion is 80 cm3 . What are the refrigerators coefficient of performance and its power input if it operates at 60 cycles per second?
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