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cathodeRay
cathodeRay
@cathoderay
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Illustrious Member
Joined: Feb 28, 2022
Last seen: Sep 11, 2025
Profile Activity
Topics: 17 / Replies: 2129
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RE: Observation about radiators and weather compensation

Coming back to the calculations, this may well be the case. If we assume the heat loss is linear, ranging from 12.3kW at -2 ambient, and dropping to z...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Observation about radiators and weather compensation

Yes! But I'll come back to that if I may. Answers to the questions in your next and post: Continuously, as long as the room stat is calling for he...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Observation about radiators and weather compensation

@derek-m - I will have another close look. The only other connection to the rad circuit is the connection to pressurise it (it is a closed system) and...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Observation about radiators and weather compensation

@derek-m - thanks, that would be very welcome, and I am sure others will welcome it too. All the rads have TRVs and they are all definitely open (th...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Observation about radiators and weather compensation

@ronin92 - I do have a multi-meter with a thermometer scale using a thermocouple to take the readings. Putting that inside the insulation foam pipe wr...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Observation about radiators and weather compensation

@ronin92 - these temps are not easy to measure accurately. The clip on thermometers are typically +/- 5 degrees so not discriminating enough. I use a ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Observation about radiators and weather compensation

@derek-m - Thank you for the detailed explanation of the principles behind how a PHE works. That is indeed my understanding of the principles, though ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Observation about radiators and weather compensation

@derek-m - yes, we did, but didn't get to the bottom of it, largely because there weren't cold enough ambients to test the system. @kev-m - I agree ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Observation about radiators and weather compensation

@kev-m - that's interesting, and makes sense, and fits with what I observed about the power reading in the Midea controller, around 5kW when it was on...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Observation about radiators and weather compensation

@editor - useful images. Using my rather more basic IR thermometer I continue to have a roughly 5 degree difference between the top and bottom of most...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Observation about radiators and weather compensation

My flow temp is 34 deg now and my kitchen rad is definitely cooler on the bottom (with my uncalibrated but able to register differences quite well, ha...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Boiler Upgrade Scheme (BUS) monthly statistics August 2022

@editor - these stats are always fascinating. Or perhaps I should get out more often. A couple of quotes: "Since applications for grants opened for ...

3 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
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