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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Jul 24, 2025
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Topics: 17 / Replies: 2065
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RE: Do setbacks save energy without compromising comfort?

I am still unclear how practically to do this. The OAT has been falling overnight, and is currently 4 degrees, ie approaching the defrost cycle range....

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

Yes, it is in one of the modbus registers, and I just collect it as I would collect any other register value. I'm guessing it is set by an algorithm t...

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

I thought the intention with the Met office data was to verify the accuracy or otherwise of the Midea OAT, and if it passed muster then it could be ac...

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

I had considered something along these lines, but came to the conclusion that it needs a free flow of air to reflect the local air temp. It has 5V goi...

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

Yes, the real problem is the cycling, even at OATs that should have a steady LWT. Below 5 degrees OAT it will defrost cycle, above a certain OAT it ha...

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

I don't think the AA script will do anything, recall it changes the ends of the WCC, which by definition won't be in use if WCC is off because Fixed L...

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

@derek-m - I'm going to turn off the setback as from tonight, and will try a period of fixed LWT starting tomorrow morning, and will monitor what happ...

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

It's the same with Midea, most of the values are integers. I have just taken a pragmatic view that that will have to be good enough, and it is certain...

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

Thanks. I think the Met Office weather stations are mostly fairly similar, despite the fact one is on the coast, and the other inland. The data is in ...

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

The last 48 hours data, comparing a cold night with a less cold night, showing the impact of marginal capacity and defrost cycles when OAT goes below ...

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

My calculated energy out uses a lower specific heat capacity than pure water because my system has glycol in it, meaning I have assumed the performanc...

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

I will try briefly tomorrow. I have infinitely better monitoring now than I did when I last set a fixed LWT, and should be able to see what is happeni...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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