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JamesPa
@jamespa
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Joined: Apr 3, 2023
Last seen: Sep 20, 2025
Profile Activity
Topics: 17 / Replies: 2880
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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)
Reply
RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

It's a fair question There are two approaches to answering it I can think of. 1. Measure the flow-flow temperature drop across the llh. For each...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Secondary pump speed - how much slower should it be?

Going back one step, what's the llh there for? Buffers of a sufficient size correctly plumbed can be made to work (as in not materially compromise p...

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

Well said! I (and I suspect many others) have met a fair few installers who don't seem to accept this!

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan ASHP - How to optimise my set up?

Given that my advice is be patient. If you haven't already, get your system set up so that it should work well as the designers intended it to. That ...

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

Interesting, is this to get the house temp right or just the flow temp. Intuitively would have thought that the latter should be quite straightforwar...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan ASHP - How to optimise my set up?

Its not at all likely that cranking up the flow temperature to reduce the output of the heat pump is an efficient way to operate (unless of course you...

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

Interesting. It is of course in principle equally valid (although presumably achieved in practice by turning the 'wick' up or down to change LW...

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

Posted by: @derek-m ↑ The heat pump merely tries to supply sufficient energy to meet the demand. Yes. My view is simple, to think ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Real world advice on ASHP installation - 2 18kW ASHP's recommended

As others have said 2 18kW units sounds like a massive overkill, even allowing for the overstated outputs. Someone suggested 2 16kW Mideas (which hav...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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