Re: Actual heat from the fuel re: African Stove Tests

[Harmon Seaver <hseaver@cybershamanix.com>]

   I guess I'd have to weigh in here with Ken -- I don't think the book
Crispin is looking at is a reliable reference. For instance, it says:
> 
> "Relative Values of Woods as Fuels
> Best:    Hickory, beech, hornbeam, locust, heart pine.
> Good:    Oak, ash, birch, maple.
> Moderate:    Spruce, fir, chestnut, hemlock, sap pine.
> Poor:    White pine, alder, linden, cottonwood."
> 
     Having burned many cords of oak, ash, birch, and maple, I can
testify that birch simply doesn't belong in the same category, and I'm
not sure ash really does either. Ash, in fact, varies greatly between
white, green, and black -- major diffences not only as fuel but also as
lumber, strengths, etc. 
    Further, in Crispin's last post, he says:
> 
> Wet oak is 7552 lbs/cord.  Air dried it is 5120 for a difference of 2432 lbs
> of water.  It does not have a figure for wet pine.  I think the 250 gallons,
> Imperial or not, is correct.

     Which wet oak? There are a great many species of oak, and having
cut and hauled a bit of oak (red, white, and northern black), I know
none of those will go 7552 lbs/cord. White oak, the heaviest (and which,
btw, often has more btu's than hickory) runs about 5570 lbs/cord, green
weight, and about 4200 dry. Not sure what swamp oak or live oak weighs
green, although I can understand them weighing more due to a damper
environment. Likewise tropical hardwoods can weigh more. Live oak might
weigh quite a bit more than white oak, but most people down where live
oak grows don't burn much firewood. 
   If you do a web search on green wood weight, you'll find a good bit
of variety -- I suspect that even a specific species varies in weight
depending upon it's environment and time of year cut. Or even possibly
locale cultivars.




-- 
Harmon Seaver
CyberShamanix
http://www.cybershamanix.com

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