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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 17, 2025
Profile Activity
Topics: 17 / Replies: 2865
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RE: Secondary pump speed - how much slower should it be?

Temp sensor (or two) in buffer monitor where the thermocline is, heat pump adjusts the flow from the heat pump accordingly, thus keeping the separatio...

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

You can try arguing with the installer. In my experience this will work with some, but many will take no notice. Basically its a sellers market so m...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Rethinking High-Temperature Heat Pumps

Exactly that. There is clearly an argument, in some, perhaps many retrofit situations with radiators, for running at say 55C ((which I guess is on th...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Rethinking High-Temperature Heat Pumps

Er is that true, or is it only the case that any heat pumps when run at high temperature results in lower efficiency (which is of course the case)? T...

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

To some extent you are doing that by contributing to this forum. I have also wondered the same (but am enjoying being retired too much to want to com...

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

reposted because it got out of sequence somehow As stated upthread about 2-3% per deg C, but if you want an accurate number check your system...

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

As stated upthread about 2-3% per deg C, but if you want an accurate number check your systems data tables. Throttling is a different phenomenon whi...

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

Agree. Doubly so with retrofits, where system design in the context of the specific house is the key to an implementation which is effective, cost ef...

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

Spot on IMHO and my studying, like yours, of manuals, posts and the various other info available.

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

Thats from Freedom, what does the OEM actually say Here is the system diagram from page 4 of the Midea manual. No buffer tank, LLH or PHE in sight.

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

In fairness to the manufacturers I think that most of the critical tests are done to BS/EU standards, and they generally quote the numbers. The stand...

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

And as i point out above, its easy to work out roughly how much its costing. Measure the flow to flow temperature drop across the llh and reckon on 2...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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