A refrigerator uses R-134a as the working fluid and uses a subcooling-superheating heat exchanger located after the evaporator to subcool the refregerant entering the expansion valve. The refregerant leaving the evaporator is superheated in the process. Assume the refregerant leaves the evaporator as saturated vapor and the condenser as saturated liquid and no pressure drops occur in the heat exchangers. The evaporator temperature is - 10°C, condenser pressure is 1000 kPa, and the flow rate is 20 kg/min. Assumming that the refrigerant is superheated 10°C, determine a) the compressor power; b) the tons of refrigeration; c) the COP.
A refrigerator uses R-134a as the working fluid and uses a subcooling-superheating heat exchanger located after the evaporator to subcool the refregerant entering the expansion valve. The refregerant leaving the evaporator is superheated in the process. Assume the refregerant leaves the evaporator as saturated vapor and the condenser as saturated liquid and no pressure drops occur in the heat exchangers. The evaporator temperature is - 10°C, condenser pressure is 1000 kPa, and the flow rate is 20 kg/min. Assumming that the refrigerant is superheated 10°C, determine a) the compressor power; b) the tons of refrigeration; c) the COP.
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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Transcribed Image Text:A refrigerator uses R-134a as the working fluid and uses a subcooling-superheating heat exchanger located
after the evaporator to subcool the refregerant entering the expansion valve. The refregerant leaving the evaporator
is superheated in the process. Assume the refregerant leaves the evaporator as saturated vapor and the condenser
as saturated liquid and no pressure drops occur in the heat exchangers. The evaporator temperature is
10°C, condenser pressure is 1000 kPa, and the flow rate is 20 kg/min. Assumming that the refrigerant is
superheated 10°C, determine a) the compressor power; b) the tons of refrigeration; c) the COP.
X+M+
Fr
Condenser
3
4
Heat Exchanger
Evaporator
+
F
Compressor
T
6
4
5/1000kPa
세
-10°℃
2
-0°℃
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