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cathodeRay
cathodeRay
@cathoderay
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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

I fear I am not explaining things very well. Let me try again. Let's start with a very simple imaginary scenario. Over a 24 hour period, the outside...

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

I had a similar experience, but the range was wider, some clearly far too high, others definitely too low. I don't think the 12.4kW figure is that far...

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

I already have an external power meter, the heat pump supply has its own meter. I know exactly what the heat pump input is, recorded on a weekly basis...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP in Hampshire

Wow, that is a lot. I have nine which at full whack can theoretically deliver 12.4kW. If the primary pump in your 12kW (which is very likely the sa...

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

As I expect you all have recognised, I tend to be sceptical of data that I can't verify at every stage, especially when the data is in effect the manu...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP in Hampshire

@batalto - your progress reported here is also very interesting, especially removal of the LLH header and relying on only the pump in the Midea main u...

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

@batalto - ah, that makes sense, I'd forgotten you have a considerable solar input. Downloading the raw data from the app - do you know if that is pos...

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

@batalto - I think the problem may be the charting. The numbers for 2022-11-18 ie yesterday/Friday (those in second screen grab) don't appear too unre...

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

@batalto - it's probably just me, but I am not sure I can make any sense of that chart apart from one thing - like me, you have your DHW desired temp ...

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

I suppose that is plausible but it seems on the low side. Assuming building heat loss vs temp is linear, 12.4kW @ -2 / 0kW @ 20 degrees ambient, then ...

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

@derek-m - thanks for the figures. I knew the adjustment wasn't linear, useful to have a bit more precision. Given some of the lockshields only have m...

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

Interim update: the rads are approaching being balanced, its taking a while because it is so mild and the heat pump is not running for longish periods...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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