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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 9, 2025
Profile Activity
Topics: 17 / Replies: 2810
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RE: Best temperature wave form for best economy and efficiency .

In general lower FT = higher efficiency. These are only 1C apart however and with different outdoor temps, but perhaps more importantly both have ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ASHP and how it should run and potential kw consumption?

Consumption is not that much different to mine when it was very cold. You wont be getting a COP of 4 when its -3~-5 outside, more like 3 or possibly ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is it crucial to get flow temperatures with heat pumps right?

The bodies of TRVs usually have an arrow on them. If it can operate bidirectionally it will be a bidirectional arrow!

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant Arotherm ASHP gets noisier when it gets colder outside

Thanks for the suggestion. This appears to have a solid shiny surface and be designed to reduce transmission. I think what I need to do in my s...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant Arotherm ASHP gets noisier when it gets colder outside

My 7kW Arotherm does the same. Its especially noticeable during recovery from defrost, when the compressor is going at 100%, and at this point its ha...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

Sadly I think you are right, until someone develops a cost effective no-frost coating which can be applied and prevents (or reduces) condensation buil...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is it crucial to get flow temperatures with heat pumps right?

... in theory! If they are all (close to ) perfectly sized then adjusting setting them up for consistent deltaT across the radiator is another way t...

8 months 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 too have been thinking about this, not least because the only disappointment with my heat pump is that its noisy when recovering from defrost. I t...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is it crucial to get flow temperatures with heat pumps right?

I mean the room. I'm assuming that there is spread in radiator sizing in reality!

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is it crucial to get flow temperatures with heat pumps right?

Perhaps I didn't make myself clear. Let's make up a scenario and see if we can do better. Suppose you want all rooms at 20C. Your rads are success...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is it crucial to get flow temperatures with heat pumps right?

Apologies if you already know this but dont try to get the temperatures right by adjusting the rads, aim to get them approximately the same. That sho...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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