If
you have ever checked the appliance label on the side of your air
conditioner's external unit, you may have noticed the EER and COP
ratings. So what are they and how do you use these ratings?
An
air conditioner's cooling efficiency is measured by the Energy
Efficiency Ratio EER. The EER is the ratio of the cooling capacity
output per hour [measured in British thermal units BTU] compared to the input
power in watts.
When
the input power is not stated on the appliance's label, you can work
this out by dividing the cooling output capacity figure by the EER and the heating output capacity figure by the COP.
To
work out the maximum cost of the appliance, simply multiply this resulting
figure by your electricity cost per kWh in cents [example 25 cents].
Cooling
example:
- Input power rating 1.84 kW / Output rating 6.0 kW / EER 3.26
- Cost per hour is 1.84 kW X .25 cents = 46 cents
- Input power rating 6.0 / EER 3.26 = 1.84 kW
Heating
example:
- Input power rating 2.05 kW / Output rating 7.0 kW / COP 3.41
- Cost per hour 2.05 kW X .25 cents = 51 cents
- Input power rating 7.0 / COP 3.41 = 2.05 kW
The
cost per hour in the above example is going to be the maximum cost
per hour, as this is not taking account any thermostat operation.
A
known rule of thumb calculation used in the world of AC, is to use
70% of this input power rating when the system is reaching the
required temperature / thermostat level. Once this level is achieved
then the figure is reduced to 40% of the input power rating.
If you are looking for an AC Calculator or want to see example costings then visit this link AIR CONDITIONER COST CALCULATOR.
This blog post brought to you by Aussie Home Energy, a major player in the HOME ELECTRICITY SAVING SERVICES industry in Australia.
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