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cathodeRay
cathodeRay
@cathoderay
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Illustrious Member
Joined: Feb 28, 2022
Last seen: Sep 11, 2025
Profile Activity
Topics: 17 / Replies: 2129
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Reply
RE: ÀSHP heat loss - how close to perfect can we get?

@jamespa - thanks. I was reading something on that website as you posted on how degree days are calculated. It seems the preferred method integrates t...

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

@jamespa - we cross posted. I think there is a fundamental flaw in my suggested approach as described above, most people don't have access to the data...

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

And of course I can do this, measure energy out, but only because I have the data I do. Since most people don't have access to this data for their hea...

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

That is exactly what I have been doing, since early last year (late March)! On my standard chart, which is based on minute by minute data, you can see...

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

@majordennisbloodnok - as you well know, the general view here is the only dumb question is the unasked one. I too have thought about what measure...

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

Juxtaposing those two could lead to interesting results... Seriously though, I think the following, which are not a million miles at all from your s...

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

In fairness, I didn't say he said whatiffery fails, it is me who said whatiffery fails. I am deliberately plugging this point because as frequent read...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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)
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