A vapor-compression heat pump system uses R-22 as the working fluid. It enters the compressor as saturated vapor at 2℃ and is compressed to 14 bar and then it exits the condenser as saturated liquid. The compressor isentropic efficiency is 70%. Determine: a) The work input to the compressor. b) The heat transfer in the evaporator. c) The coefficient of performance.

A vapor-compression heat pump system uses R-22 as the working fluid. It enters the compressor as saturated vapor at 2℃ and is compressed to 14 bar and then it exits the condenser as saturated liquid. The compressor isentropic efficiency is 70%. Determine: a) The work input to the compressor. b) The heat transfer in the evaporator. c) The coefficient of performance.

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

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

Problem 13RQ: Condensers in these refrigerators are all_______cooled.

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Question

a) The work input to the compressor.

b) The heat transfer in the evaporator.

c) The coefficient of performance.

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Step 1: Calculation of the work input, heat transfer in evaporator and COP

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Step 2: a) Calculation of the work input to the compressor

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Step 3: b) Calculation of the heat transfer in evaporator

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Step 4: c) Calculation of the coefficienct of performance

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