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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Aug 15, 2025
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Topics: 17 / Replies: 2075
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RE: Do setbacks save energy without compromising comfort?

I agree with the first part, and have been at pains to point them out, so they can be critically examined, but not the second part. I do not do 'here ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

@jamespa - I have other things to do today, as the sun is out, and so will return to it later. I also need to clear up whatever is goofing my spreadsh...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

OK, I suppose the expected energy in is also a modelled value, but the point is that it is a very simple process, using two variables, OAT and observe...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

The setback did start on the 4th November, at 2100 hours. As noted earlier, the first and the last days are not typical, they only include 3 rather th...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

There are some rather odd things going on! The long post I have just posted (I think) still remains as a draft, despite having clicked ADD REPLY, so I...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

When a specific ratio mysteriously reappears something is usually not right! Now i think I might know what it is, and it is the old gremlin of having ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

@derek-m - it's in the post (and is repeated in a reply to @jamespa I am about to post). In short, it is the equation given by the spreadsheet for the...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

I agree, but at the moment the results are quite far apart. That is what we have to reconcile. One method is over-correcting, or the other is under-co...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

I haven't forgotten there is at least one other way to approach this problem: compare the observed energy use during a setback with the expected energ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

@jamespa - perhaps more importantly, recall that we are using a corrected energy in, the 1.18 correction factor that (on average) brings the calculate...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

(a) this is in fact something of an unknown. The external kWh meter reads all energy going in to the heat pump, and as both circulating pumps are supp...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

@jamespa is using my data, meaning I can explain how the setbacks are done, and the other factors involved: (1) my system is always on weather compe...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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