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cathodeRay
cathodeRay
@cathoderay
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Illustrious Member
Joined: Feb 28, 2022
Last seen: Sep 9, 2025
Profile Activity
Topics: 17 / Replies: 2123
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RE: Do setbacks save energy without compromising comfort?

@derek-m - my heat pump appears to keep the flow rate steady, unless the heat pump is completely off. Flowrate (m^hr) added in gold, trace for last 24...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona Setback

I agree, and in the main thread with the data I have been careful to point out this is a very limited data set, less than a week, with nothing excepti...

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

Actually, we do know the LWT and RWT when the heat pump is off, see my charts, and so can estimate the radiator temp, say an average of the LWT and RW...

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

@derek-m and @jamespa - it might help if I clarify how I do the calculations. The minute data has amps, volts, LWT, RWT and flow rate. I have assume...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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)
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