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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Aug 29, 2025
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Topics: 17 / Replies: 2081
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RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

I'm pretty sure the two wires visible are multi-core. The secondary pump for example has only one wire (cable) going to it, but it must have more than...

9 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 - some more info such as it is (photos taken a while back): (1) I appear to have a Grundfos primary pump (this is the inside of the outdoor...

9 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 - here's a not very pretty plot of OAT and flow rate for the last 48 hours. The right hand end is not typical, as the OAT exceptionally high....

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

I think this is very pertinent. I believe the Midea reported flow rate (of around 1.4cu m/h) is about right because there is an anlague flow meter in ...

9 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, I agree, and also agree that the the combination of low rad temps and warmer but not yet up to desired temp rooms reduces heat transfer. For exam...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: In the Bleak Midwinter...

Defrost cycles are ones in which the LWT falls below the RWT, ie the circulating fluid loses heat as it passes through the heat pump. Thus all the cyc...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: In the Bleak Midwinter...

Wind chill in action. The OAT has warmed up a lot over the last 24 hours but my heat pump is still failing to get my house back up to temperature. The...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Massive Electricity Cost for Running My Air Source Heat Pump

@econonsense - tomorrow is fine. Is there not some sort indoor controller panel? That is where you would normally get and set the settings? Very few o...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Massive Electricity Cost for Running My Air Source Heat Pump

@econonsense - if that is the timing, then it has long enough to heat the water - but to what temperature? You need to find out what the set (target) ...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Don’t ‘TRV’ (Trust a Radiator Valve!)

I really should proof read comments before posting...

9 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Massive Electricity Cost for Running My Air Source Heat Pump

You need to check what it is actually set to. I am not familiar with your brand of heat pump, but it should nonetheless give you some form of monitori...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Massive Electricity Cost for Running My Air Source Heat Pump

Indeed. They do have a chatbot box on their website, maybe that works 24/7.

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Page 45 / 175
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