[Stoves] modification to Champion TLUD

[Paul Anderson]

Dear Huck and all,

I am delighted to see your progress and determination.

I hope that others will comment also.  There is certainly room for 
alternative thoughts to what I am replying.  This all refers to TLUD-ND, 
that is, the Natural Draft units.   And we are not focusing on the issue 
of costs of materials and labor to accomplish Huck's design considerations.

1.  The Troika design is essentially a Champion TLUD (as represented by 
the units from Servals in Chennai) but with legs that serve as 
handles.   The air flows are basically the same in both designs.

2.  With fuel chamber diameters under 8 inches (20 cm), a single entry 
point for the primary air has seemed quite adequate for the primary air 
to spread around the entire grate area.    And a single position is MUCH 
easier to control than if there are multiple points of entry.

3.  Secondary air is both easy and tricky.   Easy because it seems to be 
somewhat "self-regulating" with the only control factor being the gap 
(or a set of holes) at the top of the fuel chamber. We need good mixing 
of SA with the combustible gases, with efforts to have very clean 
combustion.

However, SA is tricky because (as Crispin has recently measured at 
Servals) an EXCESS of secondary air can reduce efficiency by diluting 
the flame and therefore lowering the temperature of the gases that reach 
the pot.   But too much reduction is an invitation to have poor combustion.

Therefore, I would recommend efforts to control the secondary air in 
relation to the gap or holes under the concentrator disk, and not spend 
money on limiting the entry of the air into the bottom of the annulus 
between the two cylinders.

For this topic, I hope that the work of Kirk Harris and Jock Jill and 
Julian Winter and others will be considered for incorporation into you 
designs.

4.  Of course, so many things change when even a little forced air (FA) 
is applied.   And that is why I have favored SINGLE entry points for the 
primary air and the secondary air.   Force air will be increasingly more 
available, and its impacts are highly advantageous in TLUD stoves.

##### The importance of sharing this discussion and the resultant 
experiments and final outcomes is SOOOOO important.   The past decade of 
constant advancement and increasing recognition of TLUD 
microgasification has been based on sharing.   In general, the smaller 
the entity, the more open is the sharing.   Because some substantially 
bigger participants with grants have been active, we can hope for their 
contributions also, eventually.   But for now, we rely on the individual 
efforts of increasing numbers of TLUD practitioners.

And I thank you all!!!!!!

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 10/8/2014 10:48 PM, Huck Rorick wrote:
>
> Hi Paul,
>
> For our housing project in Cameroon we have been using Serval's 
> version of your champion TLUD as a model.  We would be undertaking to 
> make several different stove models locally including something 
> similar to the Champion.  I was looking at one possible modification 
> and wanted to get your feedback.
>
> Huck Rorick
>
> Executive Director
> Groundwork Institute
> 2640 Silvercrest Street
> Pinole, CA 94564
> Phone: 510-222-4111
> email: huckrorick at groundwork.org <mailto:huckrorick at groundwork.org>
> Website: _www.groundwork.org <http://www.groundwork.org>_
>

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