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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Oct 12, 2026
Profile Activity
Topics: 18 / Replies: 3071
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RE: Adventures in heat loss calculations

@jamespa and @rob-of-york — thank you both very much I think I have now got it well enough to retain it! The light bulb paragraph for me (I am better ...

1 month ago
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Air Source Heat Pumps (ASHPs)
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RE: Adventures in heat loss calculations

This was how I understood things, and is why you need to add PO to the primary source contribution (which I will call PP, Power Primary, as opposed to...

1 month ago
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Air Source Heat Pumps (ASHPs)
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RE: Adventures in heat loss calculations

That is a very good point which I hadn't taken into account. I don't mind being warm, but it is wasted energy. Another point is that in winter, the DH...

1 month ago
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Air Source Heat Pumps (ASHPs)
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RE: Adventures in heat loss calculations

I agree, and I think it is good stuff to be posting, as it provides others who have sufficient data to do their own analyses. It's possible it is...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Adventures in heat loss calculations

I'm still not sure! Consider this chart with an added line which represent to total heat loss:     My reasoning: the added upper dot...

1 month ago
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Air Source Heat Pumps (ASHPs)
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RE: Adventures in heat loss calculations

Thanks. No, I forgot to do that. But don't we add it when using IAT - OAT rather than degree days? The plotted line shows what the heat pump supplies,...

1 month ago
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Air Source Heat Pumps (ASHPs)
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RE: Adventures in heat loss calculations

This thread being the more generic one is I think the best place for this post. I have now plotted my data from 1st Jan 2026 to the end of the heati...

1 month ago
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Air Source Heat Pumps (ASHPs)
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RE: Adventures in heat loss calculations

An excellent description of the problem with small data sets, and thanks for posting all this. ...suggests something is wrong, and it can't be ex...

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

@rob-of-york — I have total energy delivered plus separate space and DHW heating values so can do the analysis either way. However, since we call the ...

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

OK, this one is fairly easy, because most of what is needed is in a 24 hour data file (logs past 24 hour values every hour on the hour):   ...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
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