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cathodeRay
cathodeRay
@cathoderay
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Illustrious Member
Joined: Feb 28, 2022
Last seen: Sep 23, 2025
Profile Activity
Topics: 17 / Replies: 2165
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Reply
RE: Performance in the current cold snap…

Yes, that is the right document. I absolutely get this, but my hands are tied by the design constraints: small area for rads, fitted the largest we co...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Midea ASHP Install & Potential Changes

I appreciate that, and no harm in doing it, but it helps to have something to focus on, as you have now done. Freedom, who also supplied my Midea he...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Midea ASHP Install & Potential Changes

@dons - the is quite a lot of info there, but not so much in the way of clear specific questions. It might help if you summarised your key questions, ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance in the current cold snap…

@iancalderbank - The manual the tables comes from is available online, and can be found using google (midea m thermal mono engineering data pdf). A li...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance in the current cold snap…

Looks interesting, thanks for posting, will watch it when I have a chance. The installation meets (exceeds) the airflow requirements in the insta...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance in the current cold snap…

@derek-m - I do wonder if it is time to drop the cold well seriously compromises my heat pump hypothesis, on the grounds that it seems increasingly li...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance in the current cold snap…

This is one of the points I made earlier, cooling the local air is as far as I can see normal behaviour for a heat pump, and to that extent many if no...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance in the current cold snap…

@iancalderbank - your second chart, zooming in on a single defrost cycle, is interesting, in that, apart from the RWT, and a slightly different but no...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance in the current cold snap…

@derek-m - thanks. I'll see what I can come up with in the way of smoke bombs (what could possibly go wrong? Last autumn an awkward neighbour read me ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance in the current cold snap…

@derek-m - might you be mixing up 'normal' cycles and defrost cycles? I agree there is a loss over the PHE, meaning the LWT at the heat pump needs t...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance in the current cold snap…

They are mostly defrosts, identified by the LWT dipping below the RWT. In normal running in milder weather, is does cycle, probably because the Mid...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Midea ASHP controller

If you are willing to do a bit of work, there are other ways of getting Midea data. One is to use a python module called midea_ac_lan in something lik...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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