[Stoves] Chimney on TLUD stoves

[Paul Anderson]

Huck,

In the video, see 1:30 to 1:40    and   also 2:20.    The chimney goes 
out the back side of the shield that creates the sunken pot.   Note that 
the POT has a black metal ring around it.   The ring seals the gap 
between the pot and the shield.   It does NOT need to be a perfect seal, 
but should be "reasonable".   The hot gases up the chimney create the 
draft (partial vacuum) for the natural draft of the gasifier AND it will 
pull inward some air through any small gaps between the pot (with ring) 
and the shield.

"Pots with rings that close the gap" is one way.   The other way is 
"shields with rings into which pots are placed."

For even better heat transfer efficiency, consider having double walled 
or triple walled "shields" such as are well illustrated by the 
institutional stove structures of InStove.  See    instove.org

Paul

Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
Email:  psanders at ilstu.edu
Skype: paultlud      Phone: +1-309-452-7072
Website:  www.drtlud.com

On 12/9/2014 3:10 PM, Huck Rorick wrote:
>
> Thanks Paul,
>
> I couldn’t see very well how the chimney was connected to the TLUD in 
> the video link.  Any pictures to clarify?
>
> Wouldn’t smoke come out around the skirt?
>
> Huck
>
> *From:*Paul Anderson [mailto:psanders at ilstu.edu]
> *Sent:* Monday, December 8, 2014 9:14 PM
> *To:* Huck Rorick; 'Aprovecho Research Center'; 'Discussion of biomass 
> cooking stoves'
> *Subject:* Chimney on TLUD stoves
>
> Huck,
>
> There are views in many places showing TLUD heat sources in 
> cookstove-bodies with chimneys.
>
> One is https://www.youtube.com/watch?v=SaeanoWZE7E (It is a Quick Pick 
> item at the www.drtlud.com <http://www.drtlud.com> VIT08001  )   That 
> is a 2008 item.
>
> Another is of the Servals Champion stove with a mud/clay stove with 
> two pots.
>
> And the TLUD natural draft stove that won the first-ever Cat Pee low 
> emissions award, in 2005, and started the model name of "Champion" was 
> with a chimney.
>
> Remember to keep the concepts and devices for heat making (such as 
> TLUD) sufficiently separate from the concepts and devices of heat 
> capture (as in sunken pot and chimney and plancha, which are stove 
> structure items.).    Heat making and heat capture can be closely 
> related in many stove designs, but try to see them as aspects that can 
> be refined separately from each other.
>
> Paul
>
>
> Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
> Email:psanders at ilstu.edu  <mailto:psanders at ilstu.edu>    
> Skype: paultlud      Phone: +1-309-452-7072
> Website:www.drtlud.com  <http://www.drtlud.com>
>
> On 12/8/2014 5:35 PM, Huck Rorick wrote:
>
>     Paul, Dean & List,
>
>     Thanks.
>
>     I was especially interested in the sunken pot rocket stove because
>     it incorporates a chimney.  It looks a lot like some of the ways
>     we are trying to incorporate a chimney with the Champion or other
>     TLUDs for our project in Cameroon.  From my viewpoint a chimney is
>     essential to a wood burning stove, even when it is “super clean”.
>     In California hoods are required for natural gas stoves.
>
>     Are the details of these stoves something that Aprovecho wants to
>     keep private?
>
>     I’m frustrated with the fairly common description as “super
>     clean”.  It seems like every manufacturer says that about their
>     stoves.  It would be nice to have some more exact measurement (and
>     I guess there is a lot of debate about what the measures should be).
>
>     Anything about costs?
>
>     Huck
>

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