An air-conditioner with refrigerant -134a as the working fluid is used to keep a room at 26 Celsius by rejecting the waste heat to the outdoor air at 34 Celsius. The room gains heat through the walls and the windows at a rate of 250 kJ/min while the heat generated by the appliances amounts to 900 W. The refrigerant enters the compressor at 500 kPa as a saturated vapour at a rate of 100 L/min and leaves at 1200 kPa and 50 Celsius. Find the actual COP of the air conditioner.