Conversion factor is given by 1 Btu= 1055 J
so EER=10×10553600=2.93
By comparing the definitions of the COP and the EER, the appropriate name for this dimensionless quantity is the coefficient of performance of the air conditioner
The energy efficiency ratio is defined as:
EER= Cooling capacity Electric power (P)
Solve for P:
P= Cooling capacity EER
find the electric power of the first air conditioner using:
P= Cooling capacity (EER)1
=10000Btu/h5Btu/hW
=(2000W)(1kW1000W)
=2kW
The operating cost of the first air conditioner is then:
Operating costs =(2kW)(1500h)(0.17$/kWh) $
=510 $
For second air conditioner:
P= Cooling capacity (EER)2
=10000Btu/h10Btu/hW
=(1000W)(1kW1000W)
=1kW
The operating cost of the first air conditioner is then:
Operating costs =(1kW)(1500h)(0.17$/kWh)
=255 $