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Fuel Savings from Solar DHW - Page 2

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Posted by Ron Rosenfeld on September 8, 2005, 8:01 pm
 


Thank you for those links.  Unfortunately, neither of them seem to allow me
to calculate the information I'd like.

What I'd like to figure out is, given a certain amount of hot water usage,
how much propane will I save with a solar DHW system over the course of a
year.

If I know that, I can "plug in" various propane costs and figure the money
savings.


-- ron  (off the grid in Downeast Maine)

Posted by Paul on September 8, 2005, 9:56 pm
 


www.google.com
"solar water heating"+calculator gave:
http://www.infinitepower.org/calc_waterheating.htm  



Posted by Ron Rosenfeld on September 8, 2005, 10:37 pm
 

Thank you very much for locating that site.  It looks like exactly what I
want.  Now I will go collect the data, and find a conversion for therms to
gallons of propane. Both of those tasks should be simple.

Best wishes,


-- ron  (off the grid in Downeast Maine)

Posted by Paul on September 8, 2005, 11:26 pm
 

You are welcome. You will notice a bug in the gas payback.
You will have to shift a few decimal places to get the right answer.



Posted by Ron Rosenfeld on September 9, 2005, 12:12 pm
 

Tried it, and got results that seem to pass the "logic" test.  That means
the numbers are close to an off-the-cuff guesstimate from a local
contractor.

Thanks again.
-- ron  (off the grid in Downeast Maine)

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