[Stoves] Small clean burning TLUD

[Paul Anderson]

Crispin,

That is the small stove that you showed me (and ignited) in Ghana. 
Congratulations.   Of course I am always delighted to read favorable 
reports of TLUD stoves.

But I have some questions and issues:

1.  This is an extremely slow burning stove.   Consistent, yes. But it 
lacks fire power.   And it should therefore be compared with other small 
stoves.

2.  I am concerned about the comment
> ignoring the first 16 minutes during which the fire was getting 
> established. 
That delay alone could mean rejection of the stove by users or in 
testing situations.

3.  More details are requested:
Size of pot (especially the diameter of the bottom),
Amount of water in the pot,
Lid on pot?
Temperature of the water at key times to show the rise in temperature 
and the maintaining of boiling (or within 6 deg C of local boiling 
temperature).   Small stoves are not designed to boil 5 liters, so 5 L 
is unfair to such stoves with low power.

4.   57% cooking efficiency (capture of the heat) is wonderful. But 
/_*IF *_/it is only able to keep a baby's bottle of milk warm for over 
80 minutes, the usefulness needs clear statements when describing the 
stove.   On this Stoves Listserv we are accustomed to "standard size 
stoves for a typical meal" and the use of 5 liters of water in the pot, 
so we run the risk of equating stoves that are really in very different 
categories by size.   So please provide the requested details so that we 
can all appropriately appreciate the stated results.

5.  On the same note, but at the other extreme, the institutional stove 
by InStove (60 liter capacity pot, I believe) was proclaimed several 
times at the Ghana GACC Forum about its attainment of Tier 4 status.   
That is great!!!  But all should know that using larger pots and more 
water do greatly impact the results of stove testing.   As Dean Still 
said in his Saturday night keynote presentation at ETHOS 2015, he 
accomplished some Tier 4 ratings by shifting to a pot with 9 liters 
instead of 5 L.   He did acknowledge that he had gamed the system but 
was within the rules, so it was not cheating.  After ETHOS while at 
Aprovecho's Open House, Sam Bentson (co-author with Dean) and I and 
others discussed several ways of how to game (distort) the testing 
system.  But the promised summary of such methods was not prepared (or 
at least not released).  Maybe it will eventually be presented.

This is all part of the wonderful world of stoves.   I am observing, not 
condemning nor congratulating.   Personally, I find all of this to be 
both exciting and frustrating.

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 11/30/2015 9:11 AM, Crispin Pemberton-Pigott wrote:
>
> Dear Friends
>
> I reported recently a small stove that was very clean-burning and I 
> was able to run a simple test on it a few days ago.
>
> Attached is the performance in terms of mass loss, nominal firepower 
> and average cooking power.
>
> The cooking power was calculated from the average thermal efficiency, 
> ignoring the first 16 minutes during which the fire was getting 
> established. The cooking efficiency was 56.9% averaged over 83 minutes.
>
> Pretty impressive.
>
> Crispin
>
>
>
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