Forums

Forums
Members
cathodeRay
Activity
 
Notifications
Clear all
cathodeRay
cathodeRay
@cathoderay
Moderator
Illustrious Member
Joined: Feb 28, 2022
Last seen: Nov 13, 2025
Profile Activity
Topics: 17 / Replies: 2344
AllTopicsReplies
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 ...

12 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...

12 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...

12 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...

12 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...

12 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...

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

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

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

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

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

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

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Page 64 / 197
Share:

Join Us!

Podcast Picks

Latest Posts

Members Online

Click to access the login or register cheese
x Powerful Protection for WordPress, from Shield Security
This Site Is Protected By
ShieldPRO →