An air-conditioner with refrigerant-134a as the working fluid is used to keep a

Question

An air-conditioner with refrigerant-134a as the working fluid is used to keep a room at 22 degree C by rejecting the waste heat to the outdoor air at 37 degree C. The room gains heat through the walls at a rate of 300 kJ/min while the heat generated by the computer, TV and lights amounts to 900 W. The refrigerant enters the compressor at 200 kPa as a saturated vapor at a rate of 90 L/min and leaves at 1 MPa and 50 degree C. Determine a) the actual COP b) the maximum COP of the air-conditioner. a) b)

Explanation / Answer

The actual Cop and maximum cop of air conditioner is

a) COP = |Q|/W Ans 34

b) The coefficient of performance or COP (sometimes CP or CoP) of a heat pump, refrigerator or air conditioning system is a ratio of .... For a heat pump operating at maximum theoretical efficiency (i.e. Carnot efficiency), .... consumed (e.g. an air conditioner consuming 1 kWh would remove 2 kWh of heat from a building's air).

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