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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 17, 2025
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Topics: 17 / Replies: 2695
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RE: Performance of Heat Pumps in Mild Weather

After I wrote my initial comment I guessed that might be the case! Turning down the flow might reduce the peak power output but I cant see how it...

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?

... which presumably will reduce the cycling frequency but not materially change the on/off ratio (which is determined by the ratio of demand to minim...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

Sorry I cant help further. Knowing when the various components (compressor, fan, EEV, water pump) change state might illuminate the matter, but other...

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

Cycling will occur if the heat demand (measured in kW) from the house is less than the minimum output of the heat pump (also measured in kW), which is...

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

I cant immediately see you are misreading - although I cant be sure, I can only try to deduce, which lines correspond to which scales. Im presuming y...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Anyone able to provide some feedback before I make my finale decision? Samsung vs Baxi vs Vaillant

All good IMHO. Others may have a different view of course.

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Anyone able to provide some feedback before I make my finale decision? Samsung vs Baxi vs Vaillant

You are right to be cautious about the AI analysis, definitely contains some BS. Once you have a preliminary decision feel free to post it and the ra...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

Weird. This implies that the switch from heating mode to cooling mode is after this 5 minute period, in which case whats the 3 minute previous previo...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

Where does the heat during the 5 min period go, to the evaporator to de-ice or to the heating system (which makes no sense). Is the water pump runnin...

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

It might actually account for more defrosts because the compressor is working harder. On the positive side it should cycle less at mild temperatures!...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

Interesting. What does the water pump do during this. I understand the compressor stopping, its will need to do that to switch from heating to coo...

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

I have not yet seen a set of performance curves for a heat pump with more than a factor of 3 between max output (at say OAT - 2C) and min output (at s...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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