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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Aug 31, 2026
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Topics: 18 / Replies: 2975
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RE: Estimating true heat loss from twelve months of consumption data

@ian33a — I have a sort of residual interest in this problem as I used to have an oil tank (and boiler) and I remember how vague my usage measurements...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

I agree, and that is in effect what @jamespa and I have been doing! That's for the link and it seems I have been teaching grandmothers to suck eg...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Estimating true heat loss from twelve months of consumption data

@ian33a — a measured heat loss always trumps a calculated (whatiffery spreadsheet) heat loss, providing certain requirements are met. Firstly, the I...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

Yes, see below. They are just standard regression lines, just as in any spreadsheet, but in R you have more control and more options, but as I have sa...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Estimating true heat loss from twelve months of consumption data

Using past oil usage to estimate heat loss is tricky. Firstly it is very unusual to have accurate interval usage. You fills your tank and runs your ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

@jamespa — this version may be marginally better:  

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

@jamespa — the 0900 2100 IAT/OAT data is now in R and as a starter for ten I have distinguished between setback and setback and hour, 0900 and 2100, b...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

@peterwurmsdobler — thank you for your positive comments. You are certainly taking a diligent and sensible approach to assessing your own needs. The...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

@jamespa — as a taster, which may in fact already have given us the answer, here is the plot for the whole dataset (no setback/no setback sub sets) fo...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

The mean (over the entire range of values) difference is only 20.57 - 19.28 = 1.29°C. At lower OATs this does indeed increase, as the drop in IAT duri...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

I do lean to the idea that the main way setbacks save energy is by lowering the daily mean IAT. With careful timing, my setbacks start at 2100 which i...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

And finally, the mean daily IAT against mean daily OAT plots. I have broken my 'Y axis must start at zero' rule because on this occasion is may make s...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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