An air conditioner with R-134a as the working fluid is used to keep a room at 23°C by transferring excess heat to the outside air, which is at 37°C. Through the windows and walls, the room's thermal energy increases by 250 kJ/min while the heat generated in electrical devices accounts for 900 W. The working fluid flows into the compressor at 400 kPa as saturated steam at a rate of 100 liters/min and flows out at 1200 kPa and 70°C. a) Calculate the air conditioning power factor, COPR. b) Calculate the maximum possible power factor an air conditioner could have under these conditions. c) Calculate the volume flow of the refrigerant at the inlet to a compressor, which would have the maximum the possible power factor (which you calculated in b) and the same conditions at the compressor inlet and outlet like the original compressor.
An air conditioner with R-134a as the working fluid is used to keep a room at 23°C by transferring excess heat to the outside air, which is at 37°C. Through the windows and walls, the room's thermal energy increases by 250 kJ/min while the heat generated in electrical devices accounts for 900 W. The working fluid flows into the compressor at 400 kPa as saturated steam at a rate of 100 liters/min and flows out at 1200 kPa and 70°C.
a) Calculate the air conditioning power factor, COPR.
b) Calculate the maximum possible power factor an air conditioner could have under these conditions.
c) Calculate the volume flow of the refrigerant at the inlet to a compressor, which would have the maximum
the possible power factor (which you calculated in b) and the same conditions at the compressor inlet and outlet
like the original compressor.
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