Re: [Stoves] Chimneys, rice husks

[Alex English]

Crispin, With the pellet burner that you saw in my house (5 meter chimney) there is significant draft variation based on out side temperature and wind. Up to a factor of four in gusty conditions. You would think it a perfect application for a barometric damper. However the windier days tend to increase my house heating load and the increased draft pulls proportionately harder on both the primary and secondary air resulting in higher output without noticeable changes in combustion quality or system efficiency. This differs from the oil burner which doesn't increase fuel to match the increase in air during similar conditions. I would have to put this in a lab to see what the precise limits of this are. Alex On 14/06/2013 6:41 PM, Crispin Pemberton-Pigott wrote: Dear Lanny   Correct. We are using a flap-type which is installed in the side of the chimney by putting a Tee between the first and second pipes (they are clay pipe chimneys).   At the moment we have no idea what the ideal draft is for the stoves – 2 and 3-pot Jolentho Stoves. We will make measurements and test the performance at different sustained draft levels. There is a significant difference in the field when a 3 or 5 meter chimney is added to the same stove. Mostly there seems to be too much air drawn into the ones with tall chimneys.   Regards Crispin     ++++   Like a barometric damper?       _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address stoves@lists.bioenergylists.org 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://stoves.bioenergylists.org/

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