3 ms·
> most efficient top of the line gas furnace has a COP of 0.98 That's a steady-state, best-case figure that is almost never achieved in practice. Very long run
by sokoloff 3y ago
> most efficient top of the line gas furnace has a COP of 0.98
That's a steady-state, best-case figure that is almost never achieved in practice. Very long run times and very low temperature operation is required to achieve those figures, and most homes are not setup to create those conditions. I'd not be surprised to learn that most 95+% efficient furnaces run at 90% realized.
- voisin 3y agoThis is super interesting. Do you have a source for this? I don’t doubt it, but I had never thought of it and it doesn’t surprise me that it is a misleading figure to begin with.
- sokoloff 3y agoThe difference (loss) between SSE and AFUE is intended to cover this effect, provided the equipment is sized correctly (almost never done and almost always at least 50% oversized, leading to short-cycling and greater spread between SSE and actual fuel use [meaning AFUE is overstated]). That might give some terms to Google and find additional data. Peak COP’s equivalent is closest to SSE; SCOP is closest to AFUE.