[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 at 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/
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20130614/3b358144/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: a5XeXwssGEKnpM:
Type: image/jpeg
Size: 6990 bytes
Desc: not available
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20130614/3b358144/attachment.jpe>