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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Nov 15, 2025
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Topics: 17 / Replies: 2348
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Reply
RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

I'm sure that is absolutely right!

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

I think it's called market forces, the efficiency of markets, or whatever those who work in the field that makes astrology look reputable call it thes...

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

Which is the point I was trying to make using lay language. The throttle effect (at 11 down to 8 kW) is around 27%, the efficiency losses are (much?) ...

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

It was a rhetorical question (? at the end), not an assumption! Yes, I get that, but how large is that loss percentage-wise? The throttling effec...

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

I'm still sure about this, I think we might be mixing up throughput with efficiency. Consider the PHE as a form of obstruction: it restricts throughpu...

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

I'm pretty sure this was Freedom. In effect, as I understand it, they supply an installation kit, and the installer installs what is in the kit. I've ...

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

Interesting, I've just done what you suggest, but I don't think it gets near a QED threshold, and as we all know, and you say ('plenty of other reason...

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

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)
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