Type: E 4. A reversed Brayton refrigeration cycle uses air as its working fluid in a closed loop. The air enters the compressor at 100 kPa and -10°C, and enters the turbine at 1000 kPa and 30°C. The mass flow rate of the air through the cycle is 1.5 kg/s. Determine the rate at which heat is removed from the cold space and the coefficient of performance of the cycle if (a) the turbine and compressor are isentropic and (b) the turbine and compressor both have isentropic efficiencies of 0.80. Assume that the specific heats of the air are constant.

Type: E 4. A reversed Brayton refrigeration cycle uses air as its working fluid in a closed loop. The air enters the compressor at 100 kPa and -10°C, and enters the turbine at 1000 kPa and 30°C. The mass flow rate of the air through the cycle is 1.5 kg/s. Determine the rate at which heat is removed from the cold space and the coefficient of performance of the cycle if (a) the turbine and compressor are isentropic and (b) the turbine and compressor both have isentropic efficiencies of 0.80. Assume that the specific heats of the air are constant.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter28: Special Refrigeration Applications

Section: Chapter Questions

Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?

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Question

Type: E
4. A reversed Brayton refrigeration cycle uses air as its working fluid in a closed loop. The air enters the
compressor at 100 kPa and -10°C, and enters the turbine at 1000 kPa and 30°C. The mass flow rate of
the air through the cycle is 1.5 kg/s. Determine the rate at which heat is removed from the cold space
and the coefficient of performance of the cycle if (a) the turbine and compressor are isentropic and (b)
the turbine and compressor both have isentropic efficiencies of 0.80. Assume that the specific heats of
the air are constant.

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