Dear Paul A
Here is a result from one of the unreported TLUD coal burners tested recently which I can share a little of without identifying it. This is a medium power stove capable of heating a small home. The heating eff was not spectacular under 80% though at high power it was better. That is not unusual. The burn was 3 hours. It was net negative on PM 2.5 emissions the last 2 hours, almost exactly, cleaning the ambient air (52 µg/m3) down to <15 µg so not quite perfect. In fact that was all PM1.0. Total PM2.5 was slightly less than 4 mg per Net MJ of heat in the home for a saving of 99.4% measured against the baseline. I expect there will be 4 products in this range, all TLUDs. The CO was reasonable at 3.3 g/net MJ (space heating). The fuel was Baganuur coal with about 20% moisture. Volatiles are about 50%. It is very friable I have pulled fronds out of it. It is layered and does not break nicely into pieces, more like sections of a book. The only stove I have seen burn it cleaner is a downdraft stove, fairly large, maybe 10-12 kW which ran red hot. So, there are some real numbers the wood burners can shoot for. Regards Crispin
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