An air-conditioner is removing heat from a room at 20°C at a rate of 7200 kJ/h and rejecting the waste heat to the outdoors at 35°C. If the coefficient of performance of the air-conditioner is 3, the power consumed by the air-conditioner is:
1)0.10 kW
2)
0.67 kW
3)
1.5 kW
4)
2.0 kW
5)
6.0 kW
1)0.10 kW
2)
0.67 kW
3)
1.5 kW
4)
2.0 kW
5)
6.0 kW
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Coefficient Of Performance (C.O.P) = heat removed/work = 3 = heat rate/work {power}
heat rate removal {power} = 7200 KJ/h = 7200/3600 = 2 KJ/s = 2000 watts = 2 KW
2/power input = 3
Power input = 2/3 KW = 0.67 KW ANS 2)
heat rate removal {power} = 7200 KJ/h = 7200/3600 = 2 KJ/s = 2000 watts = 2 KW
2/power input = 3
Power input = 2/3 KW = 0.67 KW ANS 2)