Blowing up the wood

["Crispin" <crispin@newdawn.sz>]

Dear Stovers

It was pointed out that:

>Seeing who can boil one litre the fastest tests what stove can blow
>up all the wood at once, which seems to have less than optimal
>correlation to the real world of fuel efficient cooking.

Very true!  Now that we have established what the stove is,  I can admit
that the efficiency, by my calculation, was about 3% wood-to-water.  Hardly
an attractive proposition.

The stove reached its peak output of 25 KW in 80 seconds from the initial
striking of the match and by that time I am pretty sure it was already
boiling the water at the bottom of the pot without having heated up the top
portion much.  The penny pushing test would have been over in under one and
a half minutes even though not all the water was at the boiling point.

I ran the test another time using 130 gm of pine, 15gm of little twigs and 5
gm of paper.  It didn't last one and a half minutes so the water only got
very hot.

"Blow up all the wood" is an apt phrase.  Once secondary combustion has
established itself, it runs pretty consistently at 25KW power output
(100gm/minute).  Dang! Not bad for a 4 litre fire.  I have used 15 MJ/Kg for
the heat content of the wood as it is quite humid here at this time of year.

Regards
Crispin


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