Consider a refrigerator that uses refrigerant-134a as its working fluid and operates on the ideal vapor-compression refrigeration cycle except that the compression process is non-ideal. The condenser is maintained at 900 kPa, and the evaporator at -26°C. Assume that Stream 1 is a saturated vapor and that Stream 3 is a saturated liquid.

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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1. Consider a refrigerator that uses refrigerant-134a as its working fluid and operates on the ideal
vapor-compression refrigeration cycle except that the compression process is non-ideal. The
condenser is maintained at 900 kPa, and the evaporator at -26°C. Assume that Stream 1 is a
saturated vapor and that Stream 3 is a saturated liquid.
3
Warm
environment
QH
HAMA
Condenser
Expansion
valve
Evaporator
Jum
Cold refrigerated
space
2
Win
Compressor
a) If the mass flow of the refrigerant is 1.2 kg/s, what is the rate of heat removal from the cold
space? Give your answer to the nearest kW.
b) What is the COP of this refrigerator if the compressor has an isentropic efficiency of 87%?
Transcribed Image Text:1. Consider a refrigerator that uses refrigerant-134a as its working fluid and operates on the ideal vapor-compression refrigeration cycle except that the compression process is non-ideal. The condenser is maintained at 900 kPa, and the evaporator at -26°C. Assume that Stream 1 is a saturated vapor and that Stream 3 is a saturated liquid. 3 Warm environment QH HAMA Condenser Expansion valve Evaporator Jum Cold refrigerated space 2 Win Compressor a) If the mass flow of the refrigerant is 1.2 kg/s, what is the rate of heat removal from the cold space? Give your answer to the nearest kW. b) What is the COP of this refrigerator if the compressor has an isentropic efficiency of 87%?
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