One for Peter Verhaart to comment on perhaps: we probably all know by now the genesis of the inverted down draught stoves which Ronal and Tom Reed expounded early on this list and concurrently Paal was developing with his early Peko Pe and we understand how burning the pyrolysis offgas can offer very low particulates compared with burning whole wood in a conventional updraught stove but is the same true of a down draught stove if the primary air is similarly controlled?
The advantage of stratified down draught ( i.e. where the air moves down through the charge of wood as that also descends through the grate) would seem to be that the fire can be continually stoked. The disadvantage is all the extra pipe work and either needing a hot plate or sunken pots to maintain the chimney depression required to suck the primary air down. Down draught devices are normally intended to gasify all the fuel, often with extra air supplied in the "throat" but what if one was not particularly concerned if a high char ash were left? For the sake of staying on topic can we avoid the "b" word and just discuss the concept? AJH _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://www.bioenergylists.org/
