An air conditioner with refrigerant-134a as the working fluid is used to keep a room at 23°C by rejecting the waste heat to the outdoor air at 34°C. The room gains heat through the walls and the windows at a rate of 250 kJ/min while the heat generated by the computer, TV, and lights amounts to 900 W. The refrigerant enters the compressor at 400 kPa as a saturated vapor at a rate of 80 L/min and leaves at 1200 kPa and 70°C. Determine (a) the actual COP, (b) the maximum COP, and (c) the minimum volume flow rate of the refrigerant at the compressor inlet for the same compressor inlet and exit conditions.
An air conditioner with refrigerant-134a as the working fluid is used to keep a room at 23°C by rejecting the waste heat to the outdoor air at 34°C. The room gains heat through the walls and the windows at a rate of 250 kJ/min while the heat generated by the computer, TV, and lights amounts to 900 W. The refrigerant enters the compressor at 400 kPa as a saturated vapor at a rate of 80 L/min and leaves at 1200 kPa and 70°C. Determine (a) the actual COP, (b) the maximum COP, and (c) the minimum volume flow rate of the refrigerant at the compressor inlet for the same compressor inlet and exit conditions.
Physics for Scientists and Engineers with Modern Physics
10th Edition
ISBN:9781337553292
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter19: The First Law Of Thermodynamics
Section: Chapter Questions
Problem 45CP: (a) The inside of a hollow cylinder is maintained at a temperature Ta, and the outside is at a lower...
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Question
An air conditioner with refrigerant-134a as the
working fluid is used to keep a room at 23°C by rejecting
the waste heat to the outdoor air at 34°C. The room
gains heat through the walls and the windows at a rate of
250 kJ/min while the heat generated by the computer, TV,
and lights amounts to 900 W. The refrigerant enters the compressor
at 400 kPa as a saturated vapor at a rate of 80 L/min
and leaves at 1200 kPa and 70°C. Determine (a) the actual
COP, (b) the maximum COP, and (c) the minimum volume
flow rate of the refrigerant at the compressor inlet for the
same compressor inlet and exit conditions.
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