4.54 WP An air-conditioning system is shown in Fig. P4.54 in which air flows over tubes carrying Refrigerant 134a. Air enters with a volumetric flow rate of 50 m³/min at 32°C, 1 bar, and exits at 22°C, 0.95 bar. Refrigerant enters the tubes at 5 bar with a quality of 20% and exits at 5 bar, 20°C. Ignoring heat transfer at the outer surface of the air conditioner, and neglecting kinetic and potential energy ef- fects, determine at steady state a. the mass flow rate of the refrigerant, in kg/min. b. the rate of heat transfer, in kJ/min, between the air and refrigerant.

4.54 WP An air-conditioning system is shown in Fig. P4.54 in which air flows over tubes carrying Refrigerant 134a. Air enters with a volumetric flow rate of 50 m³/min at 32°C, 1 bar, and exits at 22°C, 0.95 bar. Refrigerant enters the tubes at 5 bar with a quality of 20% and exits at 5 bar, 20°C. Ignoring heat transfer at the outer surface of the air conditioner, and neglecting kinetic and potential energy ef- fects, determine at steady state a. the mass flow rate of the refrigerant, in kg/min. b. the rate of heat transfer, in kJ/min, between the air and refrigerant.

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

4.54 WP An air-conditioning system is shown in Fig. P4.54 in
which air flows over tubes carrying Refrigerant 134a. Air enters with
a volumetric flow rate of 50 m³/min at 32°C, 1 bar, and exits at 22°C,
0.95 bar. Refrigerant enters the tubes at 5 bar with a quality of 20%
and exits at 5 bar, 20°C. Ignoring heat transfer at the outer surface of
the air conditioner, and neglecting kinetic and potential energy ef-
fects, determine at steady state
a. the mass flow rate of the refrigerant, in kg/min.
b. the rate of heat transfer, in kJ/min, between the air and refrigerant.
3
+
R-134a
P3 = 5 bar
x3 = 0.20
Refrigerant 134a
Air
P₁ = 1 bar
T₁= 32°C = 305 K
(AV)₁ = 50 m³/min
Air
2+P₂=0.95 bar
T₂ = 22°C = 295 K
R-134a
P4 = 5 bar
T4 = 20°C

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