Dear Andrew
I will keep it short so you can access it. >I was only addressing the definition Agreed. >What you are are seeing is vagaries of the way measuring equipment makes assumptions about how the sensor reacts to the exhaust species and produces an output. That is what we assumed right from the start and it turned out not to be the case. I hoped it was an instrument issue. It is a formula issue. So I researched how that formula is supposed to work and does work, but not for rocket engines. If not for rocket engines, why would it work for rocket stoves? :) So the real-real answer is that EA represents available O2 as if it were air. No problem that is the definition. But to get the right answer it has to be a % of the O2 actually required at the time. What is required at the time changes with the chemistry at the time. That chemistry can be directly measured using gas analysers. Interestingly, for the same level of O2 in the stack, the EA is different under different chemical conditions. Complex pyrolysing conditions provoke all sorts of strange chemistry so the chemically balanced approach is required, actually. For a given device, the best combustion tends to take place under a certain EA level, but this varies (a lot) between devices. The BLDD6 coal stove works best with 30% EA which is a very low value and really surprised me. I would have guessed that was not possible. Regards Crispin
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