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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Oct 20, 2026
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Topics: 18 / Replies: 3075
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RE: Do setbacks save energy without compromising comfort?

The dates and times were in the post with the charts. The 1.18 factor was a guaverage, a portmanteau word. As I have pointed out before, I have lim...

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

Agreed, I went through the Midea manuals and could not find anything. But I am not sure it matters that much. We have the compressor kWh in which you ...

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

@derek-m - you have made three requests for data all within three hours, one at 8 pm, another just one hour later at 9:01 pm and then this rather petu...

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

Yes, to keep you on your toes 😉 Seriously, though, usually there is a reason, this time it is because the daily meter readings were taken at 0700.

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

I've had another look at the data and found the only series where I read the external meter of a daily basis. It is a short run, for the period 0700 o...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Defrost Cycles - How Common Are They?

@toodles - interestingly, that plot looks like a plotly/python plot, which is what I use. I don't normally include the top right icons, but I do inclu...

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

Method note (only of interest if you are interested in the code): I have sorted out the split regression line in the polynomial plot, using sort (sic)...

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

I absolutely agree - that is why the opening remarks in my very first original post in this thread, answering the question in the thread title, were ...

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

I think that if you look closely at the data you will find that that is the case. Defrosts indicated by the LWT dropping below the RWT:

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

I think the higher variation is probably due to the defrost cycles, the heat pump is literally blowing hot and cold, and the local OAT varies as a res...

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

It's certainly true that basic WC as used by most heat pumps is really only good enough for steady state operation with relatively slow over time chan...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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