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cathodeRay
cathodeRay
@cathoderay
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Illustrious Member
Joined: Feb 28, 2022
Last seen: Sep 15, 2025
Profile Activity
Topics: 17 / Replies: 2134
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Reply
RE: ÀSHP heat loss - how close to perfect can we get?

In fairness, this is what I have been saying for some considerable time. It is why whatiffery fails. Using crass numbers eg stone wall U values doesn'...

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

I have noticed that as well as solar gain, my house also gets wind chill on wet windy days, especially if the wind is in the wrong quarter. Yet, so fa...

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

@larry - I have now read the SPAB U value report in full, and it makes interesting reading, despite in places getting tangled up in putting up a basec...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: System pressure dropping on my Ecodan ASHP system

@spacebiscuit - this is an interesting question, why does an ASHP circuit need to be pressurised in the first place? I can't be, as it is with a tradi...

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

Very good to have your experience and expertise here, I am sure you have much to offer which I am sure others will welcome. Thanks too for the U Va...

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

Thanks, that's useful to know. I'll see what I can dig up. I guess that may mean you are an installer (which is fine - all are welcome here!)? Bu...

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

Any talk of 'mandatory' starts the hairs on the back of my neck rising. In close proximity to any mention of MCS, a discredited bunch of goons and sto...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

@toodles - we are, but back to basic principles: if two independent data sources agree, or are close, then that does generally suggest that both are a...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

I don't think, for my system, it is too bad, because I have some basic independent monitoring tools, and they broadly agree with the Midea data collec...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

That is certainly possible for the pipework, though the radiators are matched, plus a bit, to the 12kW heat loss, ie they are unlikely to be a bottlen...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

Unless it happens either (a) when you are asleep or (b) when you are out! Also bear in mind we only have to account for very roughly a doubling of the...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

I think that is very likely, but I didn't notice either because it happened overnight, or during the day when I was out or active. The other thing is ...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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