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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 21, 2025
Profile Activity
Topics: 17 / Replies: 2881
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RE: Do setbacks save energy without compromising comfort?

There are arguments both ways on this and each has its following. Glycol has a higher viscosity and a lower heat capacity than water so may slightly ...

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

AFAIK they all do have frost protection built in, just like fossil fuel boilers. It should override any set back (again just like fossil fuel boilers...

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

Unfortunately most heat pumps are either a) direct descendants of air conditioners originally designed to cool or b) not designed for a mild but damp ...

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

Imho any installer/specifier who doesn't do this is an incompetent fraud. It's a pretty basic requirement to match the actual declared capacity of th...

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

In answer to the last question, emphatically no in my view. More generally there will always be an offset between the modelled net heat loss and the...

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

Thanks, that seems like a good analysis. My car does something similar to your heat pump. If I drive then park, when I return to the car the reporte...

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

Thanks. Nothing is simple about heating! My observation about the discrepancy of the onset of cycling between the model and the measurements was ac...

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

Thanks for the update but I confess Im now a bit lost. 'The raw data' is presumably actual data from a real heat pump, was it @cathoderay 's or someo...

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

The wc is a curve because of the emitter power vs ft curve, (which I have been told is linear for ufh, but have not verified). So far as I can tell ...

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

@derek-m I'm not certain what these are telling us. Am I comparing calculated vs actual iat, in which case there seems to be a small divergence which...

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

Agreed Agreed (sadly but inevitably) Just bear in mind that we need as much data for the 'control' (ie without setback) as we do for the se...

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

Thanks for the extra data. 1C reduction in IAT should in theory reduce energy consumption by 1/(IAT-OAT). If IAT is 20 and OAT is 10 that's 10%. A...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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