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An AC with a heat transfer rate of 55000 BTU/HR from air @14.7 psia and 95 degrees F, with rate of 1500 ft3/min. Refrigerant 134a is used and evaporates at a constant pressure of 50 psia from compressed liquid conditions, 30F, to exit temperature of 50 F. For air, Cp=0.24 Btu/lbm-R and Rair=53.3 ft-lbf/lbm-R; Determine the mass-flow-rate of liquid refrigerant required and the exit temperature of the air.

An AC with a heat transfer rate of 55000 BTU/HR from air @14.7 psia and 95 degrees F, with rate of 1500 ft3/min. Refrigerant 134a is used and evaporates at a constant pressure of 50 psia from compressed liquid conditions, 30F, to exit temperature of 50 F. For air, Cp=0.24 Btu/lbm-R and Rair=53.3 ft-lbf/lbm-R; Determine the mass-flow-rate of liquid refrigerant required and the exit temperature of the air.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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An AC with a heat transfer rate of 55000 BTU/HR from air @14.7 psia and 95 degrees F, with rate of 1500 ft3/min. Refrigerant 134a is used and evaporates at a constant pressure of 50 psia from compressed liquid conditions, 30F, to exit temperature of 50 F.

For air, Cp=0.24 Btu/lbm-R and Rair=53.3 ft-lbf/lbm-R;

Determine the mass-flow-rate of liquid refrigerant required and the exit temperature of the air.

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