Quote:
Originally Posted by MGB=MPG
COP[ coefficient of performance], SEER,[seasonal energy efficiency rating] or EER[energy efficiency rating] ratings?
a Trane whole house heat pump Xl 16i . the energy star tag on it says the SEER is 17.0 , HSPF[heating seasonal performance factor] 8.5, other information i got [required to file for the gov. rebate]
indicates SEER 16.5, EER 12.5 ,COP 3.7 , HSPF 9
i would have to study a whole lot for any of that to have meaning to me .
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All 4 units are just slightly different ways to measure the operating efficiency of the heat pump unit ... how many joules are moved per joule consumed.
That unit is listing numbers that indicate it is ~2.6x and ~4.0x better at moving joules of heat from Point A to Point B than a 100% Efficient Space Heater that just converts joules of electricity to heat... the lowest ~2.6x ( from the HSPF of 9 ) number is what it references for heating season expectations.
COP:
Is a direct real time Watt Output / Watt Input term
A COP greater than 1.0 is better than any resistance based space heat ... for those conditions.
COP is often used in engineering and scientific testing contexts.
EER:
Is a real time measure in BTU Output / Watt Input.
Because it mixes unit type of BTU and Watt ... it is basically just an adjusted COP ... COP * 3.14 = EER
EER is often used for labeling Air Conditioning Devices for Consumers.
Any EER greater than 3.14 is better than any resistance based space heater... for those conditions.
SEER:
Is also in BTU Output / Watt Input ... but is adjusted to be more of an average , to account for changes to performance under the different conditions during the tested seasonal conditions ... an effort to give a more accurate expectation of average operation under the tested seasonal conditions ... not yearly conditions.
SEER is often used for labeling Air Conditioning Devices for Consumers.
HSPF:
Is another performance ratio ... this one tries to give a single cumulative estimate for the whole operating season ... instead of just an average like the SEER or a snap shot like the EER and COP.
HSPF is often used for heating applications.
It's in BTU / Wh as units.
It can be converted to a entire season average COP.
HSPF * 0.293 = Entire Season Average COP
Any HSPF greater than 3.42 is better than any resistance based space heater , for those conditions.