An air-conditioner is removing heat from a room at 20

Question

An air-conditioner is removing heat from a room at 20<°C at a rate of 9000 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

Quizplus · Accepted Answer

Solved by EES Software. Solutions can be verified by copying-and-pasting the following lines on a blank EES screen. 
TL=20 "C"
TH=35 "C"
QL=7200/3600 "kJ/s"
COP=3
QL=Win*COP
"Some Wrong Solutions with Common Mistakes:"
QL=W1_Win*(TL+273)/(TH-TL) "Using Carnot COP"
QL=W2_Win "Setting work equal to heat input"
QL=W3_Win/COP "Dividing by COP instead of multiplying" 
QL=W4_Win*TL/(TH-TL) "Using Carnot COP using C"

An Air-Conditioner Is Removing Heat from a Room at 20<°C