[Stoves] Ph.D. Thesis on TLUD Stoves.

[Paul Anderson]

Ron,

I am in Uganda now and have not had a chance to see the thesis. Thank 
you for the comments.

About #3, the Oorja stove is rather heavy for turning over, has a 
smallish fuel chamber meaning not much char and only short TLUD burns, 
and has a loose cast iron cup in the bottom that would fall out if the 
unit is tipped over to remove the char.   It is designed to NOT be 
tipped over for saving char.

It is intentionally designed to have continuous burning with the fire in 
the bottom consuming char.   And when doing that, the Oorja is NOT 
operating in the TLUD mode which is specifically characterized by the 
migratory pyrolytic front (MPF), but the Oorja is not with MPF after the 
rather small initial load of fuel has been pyrolyzed.

Therefore, the Oorja (and most others with forced air FA) essentially is 
NOT a TLUD because it is operated without the MPF except for the initial 
batch of fuel.

I will be addressing this topic more at the Stove Camp at Aprovecho on 
22 - 26 July.

Paul

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

On 6/27/2013 2:43 PM, rongretlarson at comcast.net wrote:
> Julien and list
>
> 1.  Thanks very much for providing this cite.   I have read most and 
> find it to be a well done thesis.   I wish we had more like it.
>
> 2.  The concepts of char and TLUDs are in here thoroughly.  But 
> nothing on the idea of a stove designed to make char.  All char is 
> presumed and desired to be consumed.
>
> 3.   My conclusion (would like to hear more) is that a good case is 
> made (not intentionally) for NOT consuming the produced char in a 
> TLUD  (this one fan-powered and widely sold in India as the "Oorja"  
> (started by BP)).  Very little gain in overall efficiency as the char 
> is consumed.
>
> 4.  A major advance was his study of the importance of ash in this 
> "char" period as a poor radiator - thereby responsible for (undesired) 
> high char temperatures.
>
> 5.   Most everything shown as a function of superficial velocity (Vs) 
> - with 16-17 cm/sec shown as key dividing point in stove behavior..  
> Above which velocity one swtches from char production to char 
> consumption.   I have not seen this before.
>
>     For his highly automated fan system, measuring Vs was apparently 
> not so difficult.  Anyone able to give a way to get an easy estimate 
> of Vs, when there is only natural draft?
>
> 6.  Quite a bit on the importance of low emissions of CO.
>
> 7.   Good information on both the experimental and computational side 
> of top-lit (packed bed) stoves.  Not much here for rocket stoves.
>
> Have I got #3 right?
>
> Ron
>
>
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