EML3007 Spring 2014

An air-conditioner with refrigerant R-134a as the working fluid is used to keep the room at 23C by rejecting waste heat to the outdoor at 37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 100 L/min and leaves at 1200 kPa and 70C. Determine
a) The actual COP,
b) The maximum COP,
c) The minimum volume flow rate of the refrigerant at
the compressor inlet for the same compressor inlet and exit conditions.