In mild climates air conditioners with EER of at least 9.0 should be selected. In hotter climates air conditioners with EER above 10 should be selected.
Note that EER is sometimes erroneous based on cooling power and electrical power consumption as
EER power = P c / P w (1b)
P c = output cooling power (Btu/h)
P w = input electrical power consumption (W)
SEER - Seasonal Energy Efficiency Ratio - can be calculated
SEER = Q c / E (2)
Q c = seasonal cooling energy (Btu)
E = seasonal electrical energy consumption (Wh)
SEER should be at least 10 - there are units where SEER reach at least 17 .
A cooling unit operates at 1 ton cooling (1 ton/kW) - or 12000 Btu/h .
The Energy Efficiendy Ratio EER power can be calculated as
EER power = (12000 Btu/h) / (1000 W)
Coefficient of Performance - COP - can be calculated as
COP = P c / P w (3)
COP = Coefficient of Performance
P c = output cooling power (Btu/h, W)
P w = input electrical power consumption (Btu/h, W)
Since 1 kW = 3412 Btu/h - COP for 1 ton cooling can be calculated as
COP = (12000 Btu/h) / ((1 kW) (3412 Btu/h / kW)
A small cooling unit operating at 1 ton per kW (1000 watts) is equivalent to a COP of 3.52 or an EER power of 12 .
The relationship between EER power and COP can be expressed as
EER power = 12 / 3.52 COP
= 3.41 COP
Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort.
Basic air changing state processes - heating, cooling, mixing, humidifying and dehumidifying by adding steam or water - psychometric diagrams and the Mollier charts.
Calculating chiller and cooling tower refrigeration loads - in tons.
Performance and efficiency terminology related to heat pumps and air condition systems.
Convert between cooling load units like kW/ton, COP and EER.
The measure of usefulness.
Efficiency is the ratio useful energy output to energy input.
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