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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Oct 12, 2026
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Topics: 18 / Replies: 3071
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RE: Where heat loss surveys seem to go against practical reality

I suspect most if not all of the tank level measuring systems available will have been developed to tell the owner when they need to fill up their tan...

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

It's an enticing idea, but the problem is knowing the oil usage over the reference period to sufficient accuracy. All I had was a sight gauge on the s...

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

@ian33a — I'm not so sure about the numbers in the last spreadsheet excerpt you posted. If your average daily oil use is 6.58L, and if an average heat...

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

@jamespa — I can't argue with any of that. I also take the important point that what you need to know in practical terms for heat pump sizing is not w...

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

But that is using a range (6.6 to 10 kW) to rule out the 14-16 kW jokers! I've said I agree the method can be and often is useful as a sense/sanity ch...

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

But there is a whiff of whatiffery: (a) what if 'the number of degree days is fairly consistent from year to year'. But what if it is not? This can ...

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

That is indeed the take away message in my view. It would be very useful if we could find a way to use oil consumption to derive heat loss, but I thin...

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

When you say 'scientifically derived', does this mean from first principles (as you imply, using degree days, and if so what is the actual derivation,...

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

It is always a good idea to quote sources, some might say it is essential. This time Wattson did get the answer, and it turns out that it is our very ...

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

Can you post your mathematics and all the data you used? Even things like how you ran the oil heating eg always on or timed? Was the indoor air temper...

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

@ian33a — a tricky one. Any or all of your hunches may be correct. Can you get the raw data Installers B and C used for their fabric heat losses, and ...

1 month ago
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Air Source Heat Pumps (ASHPs)
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RE: Problems with sizing a replacement for a Viessmann Vitocal 200-S

A very good point. In effect, the DHW pipework is an emitter, and very likely not a trivial one, given the figures @jon has previously posted. Maybe w...

1 month ago
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Air Source Heat Pumps (ASHPs)
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