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iancalderbank
@iancalderbank
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Prominent Member
Joined: Oct 17, 2022
Last seen: Jan 14, 2025
Profile Activity
Topics: 0 / Replies: 643
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Reply
RE: Performance in the current cold snap…

@cathoderay yes certainly the system overall isn't generating energy during the defrost, its spending it on the defrost actions, so its valid to treat...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance in the current cold snap…

@cathoderay its not "compressor gate" that is how they all calculate it. The energy generated was 8kwh, thats what the heat pump will report. But the ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance in the current cold snap…

are you sure that it is the HP is underpowered? or is it that your system design doesn't allow the maximum power of the heat pump to be utilised? does...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance in the current cold snap…

@cathoderay so I looked at table on page 44 of this , if thats the right unit and document? At -5C you can get 12.5kw @40C COP2.7, 12.0kw at 45C COP2....

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance in the current cold snap…

@cathoderay do you have the whole table? or a link to it. max is probably the one that matters given you are trying to run it flat out right now. disa...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance in the current cold snap…

@cathoderay unless you've got an install that doesn't comply with the MI's in terms of airflow clearances (check the installer guide) , in your positi...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance in the current cold snap…

thinking about the installers (and related roles) that I follow , who discuss this subject area on Linkedin, they are largely the good ones I think. I...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pump size advice – is 16kW overkill for this property?

@bontwoody can't see anything wrong with your reasoning. As per @kev-m, there is potentially a case that the smaller unit isn't quite enough - but in...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance in the current cold snap…

@derek-m maybe thats not the right technical term. I'm just telling you what it does. If you stand by the heat pump its a LOT colder when its running....

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance in the current cold snap…

I always see a dip in the OAT as measured by the heat pumps own sensor whilst its running. I don't think there's a microclimate. There's simply a mass...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance in the current cold snap…

@bontwoody I think the answer is that we are "total amateurs" who really really gave a damn. read every document. watched loads of training and educat...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance in the current cold snap…

@hughf here's my (worse than) design conditions day, yesterday, 18th jan, -7C at 0600. HP usage was 69kwh electricity generating 166kwh of heat. ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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