Hello Sir,''We can imagine what pre-heated ( upto around 300 C ) air can do to an already burning charcoal mass''. Question: What does preheated air do to an already burning charcoal mass?Clem
--- On Wed, 12/1/10, Johan Wessels <[email protected]> wrote: From: Johan Wessels <[email protected]> Subject: Re: [Stoves] A low cost modified traditional woodstove To: [email protected], "Discussion of biomass cooking stoves" <[email protected]> Date: Wednesday, December 1, 2010, 2:56 PM Dear Rajan Have you got a drawing available for this stove? Regards Johan Wessels South Africa ----- Original Message ----- From: <[email protected]> To: "stoves" <[email protected]> Sent: Wednesday, December 01, 2010 4:00 PM Subject: [Stoves] A low cost modified traditional woodstove > Dear All, > > I spent some time recently with Servals team in developing a low cost > improved traditional woodstove - and the result was good. > > Basically a traditional looking stove ( a 4 litre metallic container > converted ) - clay lining ( can be changed over to refractory or stainless > steel ), flame concentrator at the top ( similar to TLUD stove ), air pipe ( > metallic, around 12" long ) at the bottom. > > The flame concentrator has two functions ( as we all know ) : > > 1. Better mixing of combustion air with the woodgas - for a more complete > burn. > 2. Brings the flame to the centre of the cooking pot bottom. > > The air pipe ( horizontally placed ) brings a small quantity of air below the > burning wood mass at the centre. This air burns a little quantity of > charcoal, keeping this area intensely hot - this also keeps a stable flame > throughout. Since the pipe is metallic, this air gets preheated ( inside the > pipe ) before it reacts with charcoal. We can imagine what pre-heated ( upto > around 300 C ) air can do to an already burning charcoal mass. > > We also tried a grate at the stove bottom ( instead of the air pipe ). But > the result was not good. Air pipe has the advantage of pre-heating the air > and also allowing only a controlled quantity of air in. Some perforations > near the hot tip of the pipe adds to the performance. > > It takes about 10 minutes for the air pipe to start functioning - ie. when > the stove bottom ( inside ) gets heated up sufficiently to create a suction > through the pipe. > > The cross-sectional area of the air pipe can be around 10 % of the > cross-sectional area of the fuel-window ( through which the fuel is fed in ). > For an average domestic stove, 1 1/2" dia pipe should be ideal. > > The flame concentrator and the air pipe can be an add-on to any traditional > woodstove - including a three stone fire. Especially the air pipe is a > valuable add-on with negligible cost involved. > > The small stove we tested had a fire-power of around 3 KW ( average around 2 > KW ). The flame looked almost as good as a TLUD stove ( ND ) flame. The > fire-power can be easily upgraded for larger versions of the stove. Flame > control is like in any trditional stove ( withdrawing the burning wood ). > > With Best Regards, > > > Rajan > > > > > > ======= > Email scanned by PC Tools - No viruses or spyware found. > (Email Guard: 7.0.0.21, Virus/Spyware Database: 6.16420) > http://www.pctools.com/ > ======= > -------------------------------------------------------------------------------- > _______________________________________________ > The Stoves list has moved to [email protected] - please > update your email contacts to reflect the change. > > Please visit BioEnergy Discussion Lists > http://info.bioenergylists.org/ > Thank you, Stoves > Administrator > http://stoves.bioenergylists.org > http://info.bioenergylists.org > > UNSUBSCRIBE HERE; > http://listserv.repp.org/mailman/listinfo/stoves_listserv.repp.org > > > > > ======= > Email scanned by PC Tools - No viruses or spyware found. > (Email Guard: 7.0.0.21, Virus/Spyware Database: 6.16420) > http://www.pctools.com/ > ======= > ======= Email scanned by PC Tools - No viruses or spyware found. (Email Guard: 7.0.0.21, Virus/Spyware Database: 6.16420) http://www.pctools.com/ ======= _______________________________________________ The Stoves list has moved to [email protected] - please update your email contacts to reflect the change. Please visit BioEnergy Discussion Lists http://info.bioenergylists.org/ Thank you, Stoves Administrator http://stoves.bioenergylists.org http://info.bioenergylists.org UNSUBSCRIBE HERE; http://listserv.repp.org/mailman/listinfo/stoves_listserv.repp.org
_______________________________________________ The Stoves list has moved to [email protected] - please update your email contacts to reflect the change. Please visit BioEnergy Discussion Lists http://info.bioenergylists.org/ Thank you, Stoves Administrator http://stoves.bioenergylists.org http://info.bioenergylists.org UNSUBSCRIBE HERE; http://listserv.repp.org/mailman/listinfo/stoves_listserv.repp.org
