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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 16, 2025
Profile Activity
Topics: 17 / Replies: 2860
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Reply
RE: ÀSHP heat loss - how close to perfect can we get?

@majordennisbloodnok @cathoderay As I say above the major issue with any short term measurement is the heat capacity of the house which will, i...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ÀSHP heat loss - how close to perfect can we get?

An equilibrium state is pretty much spot on, because it means that the fabric of the house will neither absorb nor emit energy, which means you are me...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ÀSHP heat loss - how close to perfect can we get?

Without a doubt a measurement broadly of the type you are suggesting could be made, and indeed there are companies that will do it, albeit over a long...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ÀSHP heat loss - how close to perfect can we get?

You need to start with the detailed performance data not the sticker output. The '14kW' Midea unit isnt 14kW at the flow temperature and OAT under co...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ÀSHP heat loss - how close to perfect can we get?

In fairness I think (well I hope) I have said that they can be rubbish (by which I mean can lead to design choices which have material and unnecessary...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ÀSHP heat loss - how close to perfect can we get?

The majority of the installers I have encountered in my 2 year journey seem to take the view that the fabric spreadsheet method is definitive so far a...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ÀSHP heat loss - how close to perfect can we get?

I don't think we differ. I would also do the same on the basis that (good) experiment trumps theory. I was being a bit 'conservative' in my statemen...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: The good, the bad and the not that great – my heat pump installation

That may (or may not) not be significant. Many lockshields have only a tiny adjustment range ie they need to be almost 'off' to have any affect at al...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Minimum ASPH outputs?

That's an interesting development, are mitsubishi the first to do this?

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ÀSHP heat loss - how close to perfect can we get?

In fairness it's unlikely that any model will ever take all the variables into account, particularly since the variables may occur in multiple combina...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: The good, the bad and the not that great – my heat pump installation

Good luck! As you have doubtless read here the reported success rate with complaints to MCS is extremely low indeed. They are funded by the industry...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Minimum ASPH outputs?

You will need to go hunting for the performance tables (like the Vaillant one) for the models under consideration, as min output is rarely published o...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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