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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: 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...

2 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)...

2 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 ...

2 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:

2 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...

2 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...

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

And here is the version 3 (polynomial regression) code [edit 13 Jan 2024 10:00: now with sort added to remove split in regression line plot, and use f...

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

@jamespa - thanks for the kind words. I think I must be much more comfortable with 'making do with what we have' than those with backgrounds in the ...

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

I said when I first posted it and I have repeated it again, and will now repeat it for a third time, it is not meant to be an answer, let alone a defi...

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

@scrchngwsl - thanks very much for putting so much effort into this, and detailing your reasoning, and posting your code. I will post mine once I have...

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

Here's the data table from the actual chart: Don't forget I never claimed this chart was the answer to everything. In the paragraph immediately un...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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