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JamesPa
JamesPa
@jamespa
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Joined: Apr 3, 2023
Last seen: Oct 27, 2026
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Topics: 28 / Replies: 5534
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RE: Where heat loss surveys seem to go against practical reality

Absolutely, due to a combination of genuine unknowns (eg air change rate, effect of thermal bridging and even uncertainty in U values of certain mater...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Where heat loss surveys seem to go against practical reality

Our posts crossed and I have added some more explanation/clarification In answer to your comment - no you dont know where in the range it lies, and ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Where heat loss surveys seem to go against practical reality

Its not perfect but the world isnt perfect . If one were to set up a controlled experiment with comprehensive logging that would be better than any o...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Where heat loss surveys seem to go against practical reality

Yes from first principles. The temperature profile in any given location is well known and fairly consistent (averaged over a season) from year to y...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Where heat loss surveys seem to go against practical reality

To clarify - the generally accepted divisor for SE England is ~2900 which is scientifically derived from a degree day calculation based on the SE UK t...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Next steps on my ASHP journey: Radiators and Pipework

Surely the drops to the radiators are in parallel not in series, so the index circuit for pressure drop calculations will be determined by the longest...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Where heat loss surveys seem to go against practical reality

I have one Mitsubishi Ilife2-slim fancoil to solve a problem that otherwise would have required either a large K3 or a superlarge K2. Its really quit...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Surface mount or bury primaries for heat pump installation?

@tomasmcguinness Has it changed colour between photos or is that just the evening light?

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Where heat loss surveys seem to go against practical reality

@ian33a Given the nature of your house I think you did well to get estimates that close. I have to agree with this sentiment: and also The...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: vaillant aurotherm - Using Heating

Mine does the same, but recordw is only about 6kWh/month. I assume its a combination of quiescent power consumption, some of the things it does reg...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Missing flow temperature in Heat Geek proposal

I can imagine 'get outs' but doubt they will use them. Heat Geek do appear to be 'industry leading' in offering this guarantee, and everything we hea...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Missing flow temperature in Heat Geek proposal

Quite probably, does the guarantee come with any definitions of terms   Quite possibly yes, albeit perhaps surprisingly. Here is a plot f...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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