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cathodeRay
cathodeRay
@cathoderay
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Illustrious Member
Joined: Feb 28, 2022
Last seen: Sep 13, 2025
Profile Activity
Topics: 17 / Replies: 2131
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Reply
RE: Grant Aerona Setback

Have a look at my recent postings showing observed energy use with a setback and an assessment of energy saved. There is a small amount of whatiffery ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: New installation not quite right, advice sought

@mike-h - the key thing is that standard weather compensation for most heat pumps only takes account of the outside air temperature, and sets the LWT ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Does your heat pump calculate and provide you with a COP figure?

Depends what you mean by cheap, but the short answer for most people is no. Energy in isn't that complicated, but energy out is, as is the monitoring ...

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

Same here when it gets below to around 5 degrees and below, which is why I am surprised I didn't have any defrost cycles last night. Surely that ...

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

The coldest night of this heating season so far, briefly got down to 2 degrees outside and 16.4 inside, but by 0712 hours the IAT was back to 18 degre...

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

I finally found something in the minimalmodbus manual on how to read individual bits from a 16 bit register: Reading individual bits from a 16-bit...

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

@derek-m - thanks. There are lots of versions of this table around, and they are all slightly different. Here's a scan of the same part of the table f...

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

@derek-m - I am very wary of writing to any register until I am absolutely sure what I am writing to, hence the attempts to reliably read the data bef...

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

@derek-m - I agree, see above, the efficiency loss caused by raising the LWT matters, but I still think empirical data is the best way to determine ho...

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

I have in fact covered this elsewhere, things do get rather scattered all over the place, and @derek-m also covers it above. It is one of the factors ...

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

Another possibly (or possibly not) interesting insight. I have now changed (in the data file) the Set LWT during the non WC period to what it actually...

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

I have now determined that the 1800 run of the auto-adapt script yesterday somehow turned off the WCC, and put the heat pump into fixed flow temp mode...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Page 96 / 179
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