Hi Scott,
You are correct. The COP that I calculated was the refrigerant or
theoretical COP. It did not include the mechanical and electrical
efficiency. Each heat pump system will have ratings (SEER) that will
allow you to calculate the actual energy efficiency and may list the actual
Hi Chuck,
I was under the impression, and could be wrong, that each heat pump
manufacturer will provide specified COP values for each model of heat-pump they
manufacture. The COP values vary over temperature, and decrease as
temperatures get lower. As the temperature gets lower, eventually
Hi Scott,
Your comments are very relevant. The COP calculated was the theoretical
number based on the R410A refrigerant temperatures from actual
measurements. It was not based on the EER taking into account the
electrical and mechanical losses of energy. At the coldest time, the
compressed
Hi Collette,Thanks for sharing this info... Do you have the model of the heat
pump you're running at your house? I find it very interesting that it can hold
a COP so steady around 5 with such a wide outdoor temperature swing. Is it
underground?
My heat pump is ~5 years old, and not by any
I 2nd Bob’s comments. Our new generation Carrier kept us toasty with
consistent heat
Anna
Sent from my iPad
> On Feb 6, 2023, at 1:45 PM, Bob Wolf wrote:
>
> And the new generation Carrier we had installed in ’18 did a great job as
> well.
>
> Bob
>
>> On Feb 6, 2023, at 1:37 PM,
And the new generation Carrier we had installed in ’18 did a great job as well.
Bob
> On Feb 6, 2023, at 1:37 PM, Terry Green wrote:
>
> Hi Rich,
> We installed a new heat pump last May. The manufacturer is Daikin. We had no
> problems with it keeping up with our heating demands during the
Hi Rich,
We installed a new heat pump last May. The manufacturer is Daikin. We had no
problems with it keeping up with our heating demands during the very cold spell
this weekend. We were very warm. So much better than the 15 year old Carrier we
replaced.
Terry Green
Sent from my iPad
> On
It probably helps that I’m in a townhouse, so only exposed front and back. Although I have discovered that my front door needs better insulation!Leslie TurekSent from my iPhone. Please pardon typos. On Feb 5, 2023, at 12:53 PM, Elaine Jarvis wrote:I have Fujitsu Heat pumps that were OK but did
I have Fujitsu Heat pumps that were OK but did take quite a bit longer to
get to the temperature. But fortunately it is rarely that cold!! Elaine
On Sun, Feb 5, 2023 at 12:36 PM Sara Mattes wrote:
> Our pumps worked fine, but we also have a back-up forced hot air furnace
> which ensures
Our pumps worked fine, but we also have a back-up forced hot air furnace which
ensures adequate heating.
The combination kept us toasty.
--
Sara Mattes
> On Feb 5, 2023, at 12:32 PM, Andy Wang wrote:
>
> I was also interested in how other peoples’ units did. Ours did not keep up
>
I was also interested in how other peoples’ units did. Ours did not keep
up particularly well. I have a Mitsubishi unit with Hyper Heat. Would
probably do better in a home that is better insulated, ours is not
particularly well insulated. The efficiency curve drops off at very low
temperatures.
Do you mean heat pumps? My aux heater kept temps a little bit lower than my
thermostat setting, but not bad. It had recently been replaced and the new
one seems to be doing better than the old one.
Leslie Turek
On Sun, Feb 5, 2023 at 11:42 AM Rich Rosenbaum wrote:
> I was wondering how people
I was wondering how people with air-to-air heat exchangers managed during
our very cold night.
Rich
--
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