An air conditioning unit with refirigerant-134a as the working fluid is used to keep a room at 26 degrees celcius by rejecting the waste heat to the outdoor air at 34 degrees celcius. The room air 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 500 kPa as a saturated vapor at a rate of 100 L/min and leaves at 1200 kPa and 50 degrees celcius. 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.