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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 21, 2025
Profile Activity
Topics: 17 / Replies: 2698
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Reply
RE: Performance of Heat Pumps in Mild Weather

@heatgeek @robs I was going to say exactly what @robs has said. The interesting metric is the ratio between min output at high OAT/low FT and max ou...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Help me keep the faith with my air source heat pump installation

2 port buffer/volumiser is fine, will help with defrost/system volume and no downsides. 2 ports good, 4 ports bad! The general rule for rads is to ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

The full sentence was "larger radiators = lower flow temperature and larger system volume. The latter certainly would be expected to reduce cycling...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

Thank you for pointing that out, I should have commented on this also (but as you say there is a lot here). I did note this comment, am not disputing...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

Further to the above I discovered a bit more/had an additional thought about Daikin compressors. Firstly Daikin do make their own compressors so its ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

I must say Im also coming to the conclusion that there is a problem of this nature. OP has optimised the initially high flow temperature and its now ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

Very much agree. I think OP is over-concerned about this because, as you say, cycling is 'designed in'. Also very much agree We may be spli...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

'and thus its capacity' assumes that output is a linear function of modulation frequency. But I dont think thats the key point so lets not argue over ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

Aren't you potentially confusing two things here. OP could of course increase rad size/ volume and reduce ft but that won't change the minimum output...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

It can't once it has got to minimum frequency. If it isn't already at mine frequency then I agree. That would overheat the house. If house ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

@heatgeek here is the Farnborough Daikin on 7th April. A steady 7+kW when heating hot water and then a steady 1.6kW when it returns to space heating....

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

Im really gutted for you, there are loads of Ecodan 11.2kW machines out there and its a very popular and well renowned make, so it should work well. ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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