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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Sep 16, 2025
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Topics: 17 / Replies: 2146
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RE: The good, the bad and the not that great – my heat pump installation

On the face of it, perhaps, but we do want the pump to take all the heat the heat pump is delivering. But 'set to max' is a bit opaque to say the leas...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

A similar pattern happened again last night and into this morning, low overnight OAT, followed by rapid rise in OAT fooling the heat pump into thinkin...

10 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

That's actually not too bad, or, to put it another way, your heat pump can output enough heat to heat your DHW tank at an acceptable rate. The Freedom...

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

And total duration, as I can't see the time anywhere, to get from 20 to 45 degrees DHW tank temp? Agree the flow rate effectively remains constant. ...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

This has been the focus of much interest. It is located somewhere in the outside box, but I have yet to discover exactly where. Nonetheless, it is not...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

@jamespa - a very interesting analysis. I think the key thing is the duration of the cold spell, if long enough (more than a day?), in effect the hous...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

@jamespa - I'll extract the November data, including the independent OAT sensor, probably later today, and send you a copy. November has been quite a ...

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

@burtis - we can see the flow rate stays much the same throughout, and the LWT/RWT rise (from 39/32 to 59/52, about what I would expect for a DHW rehe...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

No you're not confused! There are actually two problems visible here: (1) heat pump can't quite cope during periods of low OATs (IAT falls and stays...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

Yes, though it is very tedious and boring doing it. I have a python script that does it manually over modbus (by manually, I mean I have to set the ne...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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