An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at 800kPa and the evaporator at -12°C. Determine the amount of power (kW) required to service a 5838.1kW cooling load.

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
Chapter28: Special Refrigeration Applications
Section: Chapter Questions
Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?
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An ideal vapor-compression
refrigeration cycle that uses
refrigerant-134a as its
working fluid maintains a
condenser at 800kPa and
the evaporator at -12°C.
Determine the amount of
power (kW) required to
service a 5838.1kW cooling
load.
Он
2
3 /0.8 МPа
-12°C
4s 4
@-12c = 243.34 kJ/kg
S1 = Sg@ -12°c =0.93925 kJ/kg - K
T¡ =-12°C] h =hg
sat. vapor
P = 0.8 MPa
h2 = 273.71kJ/kg
S2 = 51
P3 = 0.8 MPa
sat. liquid
hz = h5 @1MP2 =95.48 kJ/kg
h4 = h3 = 95.48 kJ/kg (throttling)
Transcribed Image Text:An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at 800kPa and the evaporator at -12°C. Determine the amount of power (kW) required to service a 5838.1kW cooling load. Он 2 3 /0.8 МPа -12°C 4s 4 @-12c = 243.34 kJ/kg S1 = Sg@ -12°c =0.93925 kJ/kg - K T¡ =-12°C] h =hg sat. vapor P = 0.8 MPa h2 = 273.71kJ/kg S2 = 51 P3 = 0.8 MPa sat. liquid hz = h5 @1MP2 =95.48 kJ/kg h4 = h3 = 95.48 kJ/kg (throttling)
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