Re: Re: heater BTU's

Posted by Jerry/MT on January 11, 2004 at 18:36:12 from (206.231.182.238):

In Reply to: Re: heater BTU's posted by Bob on January 11, 2004 at 17:07:17:

If you know the density of the wood (lbs/cu ft), then you multiply that by the number of pounds of wood required to supply 75000 BTU/hr and that will give you the # of cu ft for your fire box. For example, suppose your wood has a heating value of 1000 BTU/lb, the wood density is 25 lb/cu ft and your stove efficiecy is 60 %. Then,

(75000/1000) X 1/0.60 X 1/25 = 5 cu ft. Snce you will need mor room for air to circulate and to allow for irregular shaped wood, you'll have to make it much bigger. Maybe 2-2.5 times or more. Go to a dealer and see what dimmensions they use on their stoves.
You'll also have to get some real numbers for the heat content and the density. They are available. Do a web search. Hope this helps.

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