Answered: Refrigerant 22 enters the compressor of…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Refrigerant 22 enters the compressor of an air-conditioning unit operating at steady state at 40oF, 80 lbf/in.2 and is compressed to 140oF, 200 lbf/ in.2. The refrigerant exiting the compressor enters a condenser where energy transfer to air as a separate stream occurs and the refrigerant exits as a liquid at 200 lbf/in.2, 90oF. Air enters the condenser at 808F, 14.7 lbf/in.2 with a volumetric flow rate of 750 ft3/min and exits at 110oF. Neglecting stray heat transfer and kinetic and potential energy effects, and assuming ideal gas behavior for the air, determine
a) The mass flow rate of refrigerant, in lb/min, and
b) The compressor power, in horsepower.

Condenser
5
wwww
4
+
Air at T4 = 80°F, p4 = 14.7 lbf/in.2
(AV)4 = 750 ft/min
T3 = 110°F
%3D
3
+
2-
T2= 140°F
P2 = 200 lbf/in.2
T3= 90°F
P3 = 200 lbf/in.2
%3D
Compressor
R22 at
T = 40°F
P1 = 80 lbf/in.2

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