[Stoves] Side holes in TLUD reactor (was Re: Bangladesh TLUD

Paul Anderson psanders at ilstu.edu
Sat Dec 9 08:08:57 MST 2017


Subject line changed because this topic merit further, on goind 
discussion (and is about holes, not about Bangladesh).

Your comments below are totally correct and raise important questions.   
I focus here on the second one, about the side holes.

You point out the multitude of side holes in the Prime stoves (designed 
by Prof. Nurhuda and sold by Prime, led by Jorund Buen). And that the 
Vest has three.  Paal Wendelbo's Peko Pe has several. Anderson's 
Champion TLUD (and derivatives in Uganda by Awamu) has none.  Paul 
Wever's large tall TLUDs (Chip Energy, Stove-pipe stoves) have a few.   
And Kirk Harris also deals with the "pilot light" topic to sustain the 
flame.   And we can add more to this list, even to note those that do 
not have any side holes.

My few trials years ago with some holes was inconclusive, but I now 
think to seriosly consider them again.

Many, 9, 3, zero is certainly a wide range.

So, let's try to collectively become better informed about this. So far, 
the "theory" (shown to work) is that a small entry of secondary air just 
above the slowly decending level of the top of the charcoal inside a 
TLUD stove, produces as small flame (usually light blue because ti is 
burning CO and maybe H.)

Okay, how many holes?  positions?   diameters?    And what factors 
(including diameter and height of the fuel chamber, fuel, ND vs FA) are 
to be considered.

In the end, the practical, funcitonal results are what matter.   So 
experiments are important to do and to be reported.

Comments, please.   [This topic could be an example of why and how the 
Stoves Listserv is really valuable.]


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 12/9/2017 7:47 AM, Crispin Pemberton-Pigott wrote:
> Dear Paul and Julien
> I am responding to Paul’s comments on Julien’s earlier message.
>     On Dec 7, 2017, at 6:51 AM, Paul Anderson <psanders at ilstu.edu
>     <mailto:psanders at ilstu.edu>> wrote:
>     > 1.  The thermal mass is estracting heat, meaning cooler gases
>     inside the chamber, with risk of insufficient temperature for
>     ignition at the top, especially when nearing the end of pyrolysis.
>     Before anyone worries about heat going into the stove body, please
>     perform the trivial calculation about /how much/ heat we are
>     talking about. Just because heat goes into a stove body does not
>     mean a) it is significant, b) that it happens at a time that
>     affects performance of the cooking experience, c) that it is not
>     returned later in the session (which is cooking
>     behaviour-dependent.) Yes, there is heat invested in the stove and
>     usually it is a loss, but the other features of the stove may not
>     only recover that heat through other energy paths, it may make the
>     stove far more accessible by being cheap and easy to make from
>     local materials.
>     2.  The concrete (or ceramic) inner cylinder does not have any of
>     the side holes (24 in the metal version). Such holes allow for
>     some "pilot light" effect after the char level is below a hole.
>     Dr Nurhuda’s very successful TLUD stove had such pilots sprinkled
>     around the fuel chamber. The Vesto uses three holes only, and the
>     purpose is to maintain pilot lights to ensure the flame never goes
>     out. They are placed in a way that guarantees a small portion of
>     char is burned and there is never a need to relight because of a
>     gust of wind.
>     Regards
>     Crispin

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