A heat pump operates on the ideal vapor-compression refrigeration cycle with refrigerant134a as the working fluid between pressure limits of 30 psia and 200 psia. Determine (a) the heat absorption in the evaporator, (b) the heat rejection in the condenser (c) the work input, and (d) the COP. (e) Also, determine the COP if the cycle operates as a refrigerator instead of a heat pump

A heat pump operates on the ideal vapor-compression refrigeration cycle with refrigerant134a as the working fluid between pressure limits of 30 psia and 200 psia. Determine (a) the heat absorption in the evaporator, (b) the heat rejection in the condenser (c) the work input, and (d) the COP. (e) Also, determine the COP if the cycle operates as a refrigerator instead of a heat pump

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 2RQ: The operating condition for the single compressor in a household refrigerator is the lowest box...

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PROBLEM 2.0: In a conventional refrigeration cycle which uses Freon-12 as the refrigerant, the temperature of the evaporating fluid is -20°C. It leaves the evaporator as saturated vapor at -20°C and enters the compressor. The pressure in the condenser is 1.40 MPa. The liquid leaves the condenser and enters the expansion valve at 40°C. It is proposed to modify this cycle by adding a heat exchanger that would superheat the suction vapor to 25°C. 2.1 Compare the coefficient of performance of these two cycles. 2.2 What is the temperature of the refrigerant entering the expansion valve with the heat exchanger? 2.3 For a load of 70 kW, determine the volume flow rate for both cycles.