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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Nov 4, 2026
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Topics: 19 / Replies: 3090
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Reply
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 ...

6 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:  

6 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...

6 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...

6 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...

6 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...

6 months ago
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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...

6 months ago
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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...

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

Meanwhile, I have done the residual plots for the analysis. These are somewhat technical, but in general terms, these plots indicate whether it is rea...

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

First plot done. Initially I missed the discrete minus sign before the 100 that changes the sign of the percentage differences, but it is inluded in t...

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

It does, see above, getting it (and making sure it made sense) was not so simple! It's just an earlier version of the same standard daily energy ...

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

I now have regression equations that make sense:     For OAT = 6°C: > 79.8-(8.29*6)+(0.237*36)[1] 38.592> 91.3-(9.55*6)+(0.2...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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