Answered: An AC with a heat transfer rate 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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Question

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.

Sorry for the missing info

Expert Solution

Step 1

Given:

The heat transfer rate of AC is Q = 55000 Btu/hr.
The pressure of air is P = 14.7 psia.
The temperature of air is T_1a = 95 ^oF.
The flow rate of air is v_s = 1500 ft³/min.
The constant pressure of the refrigerant is P_ref = 50 psia.
The temperature of refrigerant when it is compressed liquid is T₁ = 30 ^oF.
The exit temperature of refrigerant is T₂ = 50 ^oF.
The specific heat of air is c_p= 0.24 Btu/lbm-R.

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