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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Jul 16, 2025
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Topics: 17 / Replies: 2064
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RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

Another chart showing the Midea heat pump can't quite cope in cold weather. Blue upper chart is outside air temp (OAT), lower green chart is indoor ai...

8 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Baffled by heat pump size/ choice!

Yes that can be done, but why do it? If you want a pint jug of water at 40 degrees C, there's no need to boil a kettle, and then dilute the 100 degree...

8 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Baffled by heat pump size/ choice!

Welcome to the forum! This is getting too hot - you might end up cooking one of the nippers (if they are nippers). The showers might be OK - unti...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: The good, the bad and the not that great – my heat pump installation

@transparent - here's the page with more details and images on what my heat pump has.

8 months ago
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Air Source Heat Pumps (ASHPs)
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RE: The good, the bad and the not that great – my heat pump installation

@transparent - I summarised the results here. What we actually found were wiring diagrams showing the PWM control cable (in addition to the power cabl...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: The good, the bad and the not that great – my heat pump installation

@burtis - what seems to be happening in both our heat pumps is the flow rate is somehow capped at the lower end of their respective ranges, with the r...

8 months ago
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Air Source Heat Pumps (ASHPs)
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RE: The good, the bad and the not that great – my heat pump installation

If you know when it will go into DHW heating mode (because it is on a timer?) then it won't take much to get useful readings, say flow rate, LWT/RWT (...

8 months ago
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Air Source Heat Pumps (ASHPs)
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RE: The good, the bad and the not that great – my heat pump installation

There is also enough info there to calculate calculate power output, which is LWT/RWT delta t x flow rate/3.6 x circulating fluid specific heat (the d...

8 months ago
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Air Source Heat Pumps (ASHPs)
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RE: The good, the bad and the not that great – my heat pump installation

If you get this in time, can you do some more screen grabs as the water continues to heat. It would be particularly useful to see what the heat pump c...

8 months ago
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Air Source Heat Pumps (ASHPs)
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RE: The good, the bad and the not that great – my heat pump installation

I think that is a very good idea. Point out gently that doing these tasks will make life easier for everyone/what if the heat pump does destroy itself...

8 months ago
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Air Source Heat Pumps (ASHPs)
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RE: The good, the bad and the not that great – my heat pump installation

@burtis - another, more worrying point occurred to me. I think at some point you may have said you asked your installers not to add antifreeze, becaus...

8 months ago
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Air Source Heat Pumps (ASHPs)
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RE: The good, the bad and the not that great – my heat pump installation

That's interesting. I don't think I've ever seen a flow rate that low. My problem is the flow rate tends to be fixed at around 1.4m^3/h, and that cons...

8 months ago
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Air Source Heat Pumps (ASHPs)
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