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Last seen: Sep 23, 2026
I agree. The 'industry' appears to concentrate on making a fast buck whilst protecting its rear end, not rolling out 1.4M heat pumps per year (that's...
Ah, now I see, yes I meant former not the latter!
Sorry but I'm not sure what you are referring to I completely agree, the thermodynamic argument is clear in the case of heat pumps (its different...
I think we do agree on this and I also think its consistent with what I was saying. Looked at another way it is also necessary that there is a highe...
More efficient still, don't switch it back on and put on a jumper.
True Thermodynamically maybe not true. Short cycling will result in a reduced requirement for higher flow temp than long cycling so thermodynam...
According to the basic physics, no they won't. Obviously there might be 'engineering' effects, but the basic physics says that running continuousl...
@derek-m Thanks for the analogy but I'm not sure how it changes the fundamentals. If the HP is forced to cycle because it can't maintain a steady sta...
@iancalderbank This is an interesting facet of heat pumps not much discussed. It's going to vary by person and property and probably also time of yea...
Its not so much frequency that causes the loss in efficiency, its the fact that, to deliver the same energy from the emitters, the heat pump must oper...
Agreed. Without doing all the sums my guess is that the critical temperatures are 4-8 (perhaps 12)C where the energy demand is high and is a temperat...
@filipe Im not sure that there was much 'good' cycling, just some where the difference was negligible. The key messages for me were 1. Cycling mea...
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Degrees of Separation
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