Dear Tom
The scale I am using has 2gm divisions and I was very fortunate to get it
for about 1/6 the cost of a new one from a company that is closing down. It
can take 12.5 Kg on its plate without complaining and I can press zero to
get the fuel use reading out directly. It counts minusly (is there such a
word?) as it burns. I can't put a 15Kg item on it and press zero - it
balks. It is a counting scale actually. It can give me 5 significant
digits accuracy if I say I am putting on a 'sample' but it can't count down
like that.
I have no idea how the 100gm of water can boil off so suddenly but there can
be other factors having to do with the initial 'boil' compared with a
sustained boil. I will do a test of perhaps 40 minutes next week when I am
back in the workshop.
I did not use 18 KJ/Kg as my heat value on the tests I sent up. I used 15
KJ. This will affect the claimed edfficiency, bringing it down 5/6ths. I
have no real method of testing the true heat content of the fuel and it
would cost a fortune to have CSIR test it in Pretoria.
I am open to suggestions on how to get the heat content of the various fuels
estimated. I was using a chart I have from woods of various types in an old
Engineering handbook. The mix is 80% pine and 20% newspaper. There is
rather a high resin content in the locally grown pine, in my view.
Have a bash!
Crispin
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