How much efficiency does a short-cycling heat pump lose? – GreenBuildingAdvisor

One proposal: model it. I know that energy plus and a few other engines (don’t know about ekotrope) have built in algorithms for cycling efficiency degradation, but it would be important to also make sure you have the specific performance map input for that unit.

What is the cycling efficiency degradation based on? I haven’t tracked down the literature –I don’t know.

I think there are elements of this that aren’t tracked in this analysis too, e.g. lineset length.

Curious for others’ insight and input on this question…

It’s coming up as a code question in my work. E.g.– is it actually more efficient to oversize than to ‘right-size’? That’s going against the catechism of ‘thou shalt not oversize’ because it’ll kill your efficiency. Fwiw I think they’re both right.