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cathodeRay
cathodeRay
@cathoderay
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Illustrious Member
Joined: Feb 28, 2022
Last seen: Sep 18, 2025
Profile Activity
Topics: 17 / Replies: 2149
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

But it is just unrealistic to expect most people in the real world to do this. And there is a related question, should they be expected to do it?

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

This is a variation on efficacy vs effectiveness. That's what Midea say in their 'ideal' manual. In the real world, stuff happens, Freedom offer train...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

See my earlier quote (1:15pm) from the Freedom Midea Installation Manual (from 2022). The word used is 'must' (have hydraulic separation). I rather su...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

@editor - interesting. If I may also borrow a quote and refer it to @derek-m: I think this may be one of the problems encountered when modelling ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

There are low loss headers, damned buffers, and then there are plate heat exchangers. The usual Freedom wording for Freedom based Midea (and Samsung?)...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Forum updates, announcements & issues

@editor - sorry to be the bearer of bad news, but I am still not getting email notifications for many of the posts made to threads I am subscribed to....

2 years ago
Forum
Introductions, Forum Rules & Updates
Reply
RE: Performance in the current cold snap…

Putting aside the toothless qualities of MCS, it is complicated by other factors. If it had been a privately funded installation, my contract would be...

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

@jamespa I think I am right in saying is of this view, and I do get this point: the heat pump responds to the feedback contained in the RWT. Indeed i ...

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

I know GH has been around for a long time, and generally knows his stuff, though sometimes he does make typo type errors. That said, I am personally g...

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

That sounds in the right range, for a very rough COP at that ambient, perhaps a bit high, see 1200 to 1500 in the second chart I posted above. When th...

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

Unfortunately, neither provides any way to control their speed externally, beyond the push button control on the secondary pump. The primary one has i...

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

@iancalderbank - an update on the PHE inlet and outlet temps after setting the secondary pump to CC3. Took ten readings from each pipe then averaged t...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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