Hybrid Car – More Fun with Less Gas

Problem #1: How Much Does Heat Cost?

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Posted by Steve Spence on October 9, 2003, 11:28 pm
Calculating and Comparing the Cost of Heat

We've all heard the adage "You have to spend money to make money."  The real
trick lies in how you spend your money.  Would you rather spend $00.00 for
electrical energy or $00.00 for a cord of wood?  Well, it depends on what
you get for $00.00.  If we limit our discussion to buying heat and assume a
cord of wood costs $00.00, how much heat will a cord of wood produce and
how much heat can we buy from the electric company for $00.00?


Steve Spence

Posted by H. E. Taylor on October 10, 2003, 6:35 am

    This is a good page Steve, and a good idea.
    It would be interesting to see how natural gas stacks up as well.


"To dream in the City of Sorrows is to dream of a better future."
-old Minbari proverb

PV FAQ: http://www.autobahn.mb.ca/~het/energy/pv_faq.html
H.E. Taylor  http://www.autobahn.mb.ca/~het/

Posted by William P.N. Smith on October 10, 2003, 12:01 pm

Indeed, good page, thanks!  He's given us the tools we need to figure
out how NG stacks up, but I'm too lazy/busy to figure it out myself.
8*)  Another vote for adding NG to the page!

William Smith    w<underscore>smith@compusmiths.com
ComputerSmiths Consulting, Inc.    www.compusmiths.com

Posted by Steve Spence on October 11, 2003, 3:06 pm
 100 cubic feet (1 CCF or Therm) of natural gas has about 103100 Btu
One gallon of kerosene has about 134000 Btu
One gallon of propane has about 91600 Btu

how much do you pay for a therm (CCF) of natural gas?

Steve Spence
"William P.N. Smith smith@compusmiths.com>" <w<underscore> wrote in message

Posted by daestrom on October 10, 2003, 10:06 pm

assume a

Yes, I like it too.  Especially the discussion of moisture content.  Many
people don't realize how much this affects the heating value of wood (also
applies to coal).

Re: Natural gas, look for the cost/therm on your utility bill (if you have
gas service).  For my area of NY, it has run between $.50 and $.77 a
therm.  Now all you need to know is that one 'therm' is 100 000 BTU's :-)

100 000 BTU's/therm  * 1kWhr/3413 BTU's = 29.3 kWhr/therm

So....  In a modern, condensing furnace (say 95% efficient), we have....

$.65 /therm / 29.3kWhr/therm  / 0.95 =  $.0234/kWhr of heat delivered (not
counting the electricity to actually operate the furnace).


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