Heat Pumps and Electric Heating - WarmAir.net Fuel Cost Compare (Heat Pump Efficiancy?)
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obillwan
10-06-06, 12:05 PM
On the WarmAir.net Fuel Cost Compare, I need help figuring out what to enter into the Heat Pump Efficiency text box. I am interested in the Carrier 25HPA5 (Performance Series). Do I enter the Seer value or the HSPF value, or somethig else? Thank you in advance.
mchild
10-06-06, 12:52 PM
obillwan,
Actually it is neither of those numbers. COP stands for Co-efficient of Performance and is not normally provided in the manufacturers marketing material.
Heat pumps have an ever changing efficiency as the air temp changes. At the extremes they are not very efficient. A good overall number to use would be 3.0 to 3.2 for the calculation at Warmair.com.
Good luck,
Mark
Actually it is neither of those numbers. COP stands for Co-efficient of Performance and is not normally provided in the manufacturers marketing material.
Heat pumps have an ever changing efficiency as the air temp changes. At the extremes they are not very efficient. A good overall number to use would be 3.0 to 3.2 for the calculation at Warmair.com.
Good luck,
Mark
Ed Imeduc
10-06-06, 12:55 PM
For the heat pump you put in the HSPF
That stands for Heating Seasonal Performance Factor.
ED;)
That stands for Heating Seasonal Performance Factor.
ED;)
obillwan
10-06-06, 03:15 PM
Now I am confused ... mchild says to use 3.0 or 3.2 and Ed Imeduc says to use the HSPF (which for Carrier 25HPA5 is 8.5). I know that Ed is a moderator, so I tend to belive him, but any other input from anyone?
TigerDunes
10-07-06, 08:57 AM
obillwan
First of all, you will need to know the HSPF value of the size heat pump system you are considering. Your dealer should be able to provide this info. Keep in mind this efficiency value goes down as the size of the system you are looking at goes up. Once the HSPF value is known, then divide this number by 3.4. This will give you a close approximation of the COP. Then you will be able to plug this number into Warm Air's fuel comparison calculator. A good COP value would be 2.5 and higher for today's high eff heat pump systems.
Good Luck
First of all, you will need to know the HSPF value of the size heat pump system you are considering. Your dealer should be able to provide this info. Keep in mind this efficiency value goes down as the size of the system you are looking at goes up. Once the HSPF value is known, then divide this number by 3.4. This will give you a close approximation of the COP. Then you will be able to plug this number into Warm Air's fuel comparison calculator. A good COP value would be 2.5 and higher for today's high eff heat pump systems.
Good Luck