10-kW cooling load (i.e., ?̇ L) is to be served by operating an ideal vapor-compression refrigeration cycle with its evaporator at 400 kPa and its condenser at 800 kPa. If the compressor’s isentropic efficiency is set at 68%, determine (a) the mass flow rate of the refrigerant, in kg/min (b) the rate of heat rejection to the environment, in kW (c) the COP of the refrigerator

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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A 10-kW cooling load (i.e., ?̇ L) is to be served by operating an ideal vapor-compression refrigeration cycle with its evaporator at 400 kPa and its condenser at 800 kPa. If the compressor’s isentropic efficiency is set at 68%, determine (a) the mass flow rate of the refrigerant, in kg/min

(b) the rate of heat rejection to the environment, in kW

(c) the COP of the refrigerator

Disregard any heat loss in the expansion valve and compressor as well as the change in potential and kinetic energy of the refrigerant in any part of the cycle.

Use g = 9.81 m/s2 or 32.2 ft/s2 , T(K)=T(°C)+273 and T(R)=T(°F)+460, where applicable.

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