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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: 2859
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RE: ÀSHP heat loss - how close to perfect can we get?

Agreed According to your profile you have an ashp, presumably operating weather compensation. This being the case I would expect a much better corr...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Business case for a battery?

Yes sorry £1 per day is what I meant. 1K per kWh is a figure I have seen quoted more than once for a 'professional' install. £160 per kWh changes t...

11 months ago
Forum
Energy Storage
Topic
Business case for a battery?
11 months ago
Forum
Energy Storage
Replies: 42
Views: 4132
Reply
RE: ÀSHP heat loss - how close to perfect can we get?

Emissivity certainly comes into it but is not strictly the whole story - because radiators aren't predominantly radiators, they are predominantly conv...

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

Yes with reservations. If the house cools materially during the 'off' period then the average IAT will be lower than the 'target' IAT and so the amou...

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

No. The amount of heat lost/gained by conduction/convection will be dependent on the surface roughness and the nature of the medium in which it is im...

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

@judith , @larry , @cathoderay Collecting the above together with my comments and those from @cathoderay A room by room fabric spreadshe...

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

Im not entirely sure what this comment is intended to convey. My analysis is as follows - there are various ways of getting at essentially t...

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

It is this averaged over 24hrs. The reason I think that the daily averaging is useful is that it distinguishes days when its cold all day from iso...

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

try/p> If you have a smart meter you have, or at worse your energy supplier has, half hourly gas meter readings. That's pretty close to energy i...

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

Which is pretty good I would say The only check I would want to do is plot daily energy against degree days. There is a risk that plotting instanta...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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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