[Stoves] Shields E450c as a way to test char-making stoves (attn: GACC testers)

[Crispin Pemberton-Pigott]

Dear Paul and Frank

 

What exactly is the problem that you see that requires a (very) different
type of solution? The proposal is, ultimately, mass-based. Mass-based
calculations of fuel energy are plagued with problems because while you can
get an answer for one type of wood (with a certain error bar) as soon as you
move to another fuel like palm leaves or shells or rice hull then
comparisons are not fair.

So perhaps the reason why stoves that make charcoal need special treatment
should be clarified. All biomass stoves make some char and there are fair
methods of dealing with it.

I suspect the root question being asked is 'What is the heat transfer
efficiency?"

If you want to know that, then there are ways to find out.

If you want to know how much fuel a stove consumes, either in mass of
energy, there are also ways, and it gives an answer  different answer from
the heat transfer efficiency question.

Calculating the mass of dry fuel equivalent that is the equivalent of the
energy used to cook is not helpful. We already would know the energy
involved. Dividing by the energy in that type of fuel just renders the final
number incomparable with stoves that use another fuel. Leave it is Joules.

Is the intention to find the heat transfer efficiency?

Thanks
Crispin

 

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