wants me to calculate heat pump heating efficiencies based on the AFUE of
the heat pump, but I see them measured in HSPF (Heating System Performance
Factor) at the state website which discusses rebates
Other USENET discussions (here and elsewhere) discuss a third measure, the
COP (Coefficiency of Perfomance).
Are there conversion factors from one to the other? Given one, how can I
calculate the others?
If there is none, is there an alternate web site I can use to estimate the
result if I replace a gas furnace with a heat pump?
Thank you kindly.
K7AAY John Bartley Portland OR USA views are mine, all mine.
"The Temporal Office says you have to do this. No, no explanation.
Here's your stuffed tuna and an airhorn." - James Nicoll
Found the aforementionsed site, plus others, but they are either opaque
(don't reveal how they calculate... which, after the flap over the bad
'hockey stick' model that was used to justify Kyoto
<http://www.jerrypournelle.com/view/view349.html#hockeystick makes me
mistrust them, as they are probably assuming we run our house hotter
than we do, our house is less well sealed than it is, or it's larger
than it is) or ask for data in arcane formats (i.e., AFUE for heat
Also, a search for the conversion factors themselves was not
I did my homework first.
Suggest take a *good* look at some typical heat pump performance charts that
show outdoor temperatures v/s btu output, and charted along with compressor
draw before attempting to give advice.
Yes. However, he said he was likely to hit basalt within 50', which
makes even the design here impractical:
Direct exchange system....
Im guessing you near the west hills else maybe down towards Oregon
City........... some hard rock in both those areas for sure....
The Troutdale aquifer is all sand, and is a perfect area for geo....oh
well.......( pun not intended )
I use all heat pumps, an easy choice since nat gas isnt readily for me and i
dont feel like bothering with propane........
My brother is up north of here, nearer to Seattle, and he uses a heat pump
with gas backup...his having gone through this process just a few years
ago...and so so if I was to advise, I would suggest you should consider
doing the same--that way you can always change over your primary heat source
depending upon what the fossil fuel v/s electricity prices do in the
future......and since you are looking 15 years out and all.....that's just
too long a time span, IMO--and so it becomes more like gazing at a chrystal
ball than it is making accurate economical decisions...anybody's guess.....
30 F usually aint bad at all...sized properly, heat pumps generally work
fine in that temp.
But, this doesnt really belong on alt hvac, so best would be to take it
offline as I dont follow the other groups you are crossposting posting
to.....feel free to email me for more info if you like--my email address is
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