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Posted by Paul B on September 10, 2005, 1:01 pm
 
Interested to see what your what your #'s actually were Ron. I know my bank
of solar thermal now gives me about $00 worht of heat...Paul


Posted by Ecnerwal on September 10, 2005, 4:22 pm
 
Sounds like you got your stuff figured out Ron, but here are some
generally useful figures for this sort of thing...generally correct,
though I have seen slightly (not hugely) different numbers for some of
them from other sources.

Mostly in english (now US,as the olde country went metric and we did
not) units, but that's what I mostly work in, as to most suppliers near
me).

1 BTU heats 1 pound of water 1 degree F

About 8 pounds of water per gallon

1 gallon of LPG = 91500 BTU
(multiply by efficiency of appliance)

1 gallon of #2 fuel oil or diesel - 138000 BTU
(multiply by efficiency of appliance)

1 cord of "average" wood - about 12,000,000 BTU
(multiply by efficiency of appliance)

1 KWH electric = 3413 BTU

1 LB of air = 13.9 cubic feet

Specific heat of air = 0.24 (1 BTU will heat one pound of air up about
4.16 degrees F).

--
Cats, coffee, chocolate...vices to live by

Posted by Ron Rosenfeld on September 10, 2005, 6:53 pm
 On Sat, 10 Sep 2005 16:22:41 GMT, Ecnerwal


Thank you for that information.  It will be useful when I develop more
specific measurements.
-- ron  (off the grid in Downeast Maine)

Posted by Ron Rosenfeld on September 10, 2005, 6:52 pm
 wrote:


It'll be a bit as the R-Value of the water heater; and the efficiencies are
not numbers I can easily lay may hands on.

However, with propane now at $.99/gal, it looks like my hot water cost is
probably around $50/year.


-- ron  (off the grid in Downeast Maine)

Posted by Paul B on September 10, 2005, 10:53 pm
 ARE you running a tank or a tankless water heater?????


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