Answer :
The Energy to be transferred out is given as 2,676,096 J
How to solve
Volume of room = 7m * 7m * 3m = 147m³
Mass of air = 147m³ * 1.2kg/m³ = 176.4kg
Energy = mass * specific heat * temperature change = 176.4kg * 720J/(kg*K) * (316K - 295K) = 2,676,096 J
Work done by the air conditioner:
Work = Energy / Coefficient of Performance = 2,676,096J / 3.49 = 767,207 J
Time for the air conditioner:
Power = Work / Time
Time = Work / Power = 767,207J / 1,074W = 715 seconds or 11.9 minutes
Time using Carnot cycle air conditioner:
Carnot efficiency = 1 - (295K/316K) = 0.0664
Work = 2,676,096J / 0.0664 = 40,305,542 J
Time = 40,305,542J / 1,074W = 37,528 seconds or 625.5 minutes
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