Dear Robert An excellent question below, and some good reasons for forced draft TLUDS.
Certainly TLUDS can work usefully without electric power. However, the flame from a natural draft TLUD is tall and skinny and so you have incomplete combustion, quenched when a pot an inch or two away from the stove top (since hot gases naturally rise). Result: you need more fuel and get soot bottomed pots. The battery allows you to have a horizontal disk of completely burned fuel. similar to the disc of heat created by a premixed gas stove. So, at present, the 1.5 V battery makes a much cleaner and more efficient stove. Good question, and I hope a good answer. Tom Reed Thomas B Reed 280 Hardwick Rd Barre, MA 01005 508 353 7841 On May 12, 2013, at 7:05 AM, Robert Fairchild <[email protected]> wrote: > > Why might we want forced air for a TLUD? > > > > For primary air: > > Higher power output (than natural draft) > > Adequate power with tight packing fuels ( pellets, rice hulls, …) > > > > For secondary air: > > Higher power output (with forced primary air) > > Improve cleanliness of combustion through better turbulence/mixing/air > quantity > > Reduce flame height to ensure more complete combustion, less soot/black carbon > > > > Anything I've missed? > > > > Thanks, > > Bob > > > > I am still thinking about venturis and enhanced natural draft secondary air > flow.
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