Dear Prof. Nurhuda and all,
Thank you for your informative response. You are one of the leaders
in TLUD work worldwide.
With my Webmaster James Schoner (JSS), we will soon have your data and
info posted to the newly revised www.drtlud.com website.
Your work reveals several important things:
1. Use of segments of stick-wood (could be called "wood segment
fuel") for TLUDs.
2. Length of time of burning: for each batch of fuel, over 1 hour to
over 2 hours in the larger units.
The above 2 are "answers" to frequently asked questions. Next is a
continuing "issue".
3. Life-span of the UB-03 stove is 6 to 12 months, but we want it to
last longer. So I discuss this below and request that Prof Nurhuda
reply to confirm or correct my statements:
A. The first part to fail is at the bottom grate or bottom of the
inner (fuel holding) cylinder. That is mainly because of the high
heat of burning charcoal. We agree that the char should be dumped out
(not burned inside of a TLuD).
B. Does the UB-03 model allow for repairs of that piece, or is the
entire stove basically lost? Replacement parts extend stove life if
available and affordable and easily installed.
C. Use of different metals for the parts with the shortest lifespan.
Is there any Indonesian experience with that?
In future messages we can discuss additional aspects of TLUDs.
Paul
--
Paul S. Anderson, PhD
Known to some as: Dr TLUD Doc Professor
Phone (USA): 309-452-7072 SKYPE: paultlud Email: [email protected]
www.gtz.de/de/dokumente/giz2011-en-micro-gasification.pdf (excellent ref.)
My website specific for TLUD information: www.drtlud.com = www.DrTLUD.com
Quoting [email protected]:
Dear Proff. Anderson,
Thank you very much for your nice response.
As you might know, the main challenge in implementation the stove is the
stove material. In this time, the stove is made from 'reject plate
material', commonly used for kerosene stove, but the thickness of plate is
a bit larger. Otherwise, it is almost impossible to sell the stove below
US$ 10,-/each. Most of our targeted users in Indonesia can not pay for
stove price higher than US$ 10,-
Consequently, users must take care when operate the stove, they have to
avoid over-heating, i.e. when wood changes to charcoal. They have also to
avoid contact between water and the stove. When the stove is used
according the manual procedures, it can last up to one year or even more,
otherwise, it depends on how the users handle the stoves, sometime the
stove can last more than 6 months, sometime less.
About the fuel. We currently use stick wood/twigs with length 17 cm for
our household stove type, and 30 cm restaurant (jumbo) type stove. Small
pieces are placed on the top only to facilitate the initial combustion.
When fuel is compactly arranged in the burning tube, we will see no smoke.
With about 1 kg fuels, house hold type can deliver flame up to 1.5 hours.
The jumbo type, on the other hand, with 3 kg fuels, can burn up to 2.5
hours (for flame) and additional 1.5 hour for charcoal. The power of jumbo
type is clearly higher than the house hold type. To boil 15 L water needs
40 minutes.
We currently have sold the UB-03 type, more than 6000 units. Totally with
UB-02, probably it counts more than 8500. User are usually satisfied with
our stoves, after they know the correct procedures in using the stove.
Beginner users usually make mistakes in using the stove and we provide the
free-consultation for it.
The most complaint usually deals with the life time of the stoves.
Subsidiaries are therefore very important in order we can improve the
stove quality. Are there international funding?
Best regards
M. Nurhuda
To all Stovers,
BRAVO to Professor Muhammad Nurhuda and his co-workers in Indonesia!!!
This is serious TLUD R&D, with practical results!!!!
The use of stick-wood segments (30 cm in this case) is highly
important. Christa Roth and I and others have seen such fuels also
used successfully in Africa (especially CREEC in Uganda). Nurhuda's
YouTube items illustrate very well the vertical placement of
serious-sized stick-wood with smaller pieces entering last,to fill
most of the vertical voids, plus small pieces on the top for ignition
(and I suspect also for appropriate additional limiting of the
vertical air flow). This deserves further serious study.
If stick-wood segments are a preferred fuel source and are available,
they will give a major boost to spreading TLUD cookstoves worldwide.
I and hopefully others will assist Nurhuda bring his excellent work to
the attention of the English speaking stovers.
M.N, please tell us how many of your TLUD stoves you have now
produced, and at what price. At ETHOS 2010 I reported about your
stoves and noted "2500 units of model UB-02 have been produced and
sold at $10." So that was probably 2009 data that you sent me.
We are delighted to have such a significant update about your work in
Indonesia!!
Paul
--
Paul S. Anderson, PhD
Known to some as: Dr TLUD Doc Professor
Phone (USA): 309-452-7072 SKYPE: paultlud Email: [email protected]
www.gtz.de/de/dokumente/giz2011-en-micro-gasification.pdf (excellent ref.)
My website specific for TLUD information: www.drtlud.com =
www.DrTLUD.com
Quoting [email protected]:
All,
Muhammad Nurhuda has provided links to an interesting series of TLUD
cooking
stoves made by Kompor Biomass in Indonesia. The videos show how large
pieces can be burned in TLUD designs.
Tom Miles
-------------------------------------------------------------------
Let me first introduce myself. My name is Muhammad Nurhuda, I am
researcher and teaching staff at Physics Department, Brawijaya
University,
Malang, Indonesia.
We have developed various biomass stoves. The fuels also vary from
chopped
woods/twigs, pellet, palm kernel shell, hazelnut kernel shell,
corncob,
etc..
You might see the videos of our stoves in the following youtube's
addresses:
http://www.youtube.com/watch?v=sty_pdFYr44
http://www.youtube.com/watch?v=B4r5U18s_OY
http://www.youtube.com/watch?v=g7TZn6YGOcI
http://www.youtube.com/watch?v=KOba6FobfrQ
http://www.youtube.com/watch?v=b70z9-0nK6E
All stoves presented above are of TLDU types, but the combustion is
improved by using pre-heating and counter-flow burning mechanism. The
one
intended for palm kernel shell utilizes diffused-combustion mechanism,
in
addition to pre-heating and counter flow mechanism.
The latest one
http://www.youtube.com/watch?v=b70z9-0nK6E
is devoted for institutional cook stove or small restaurants.
Very recently, we have also developed a new rocket stove. The combustion
in this new rocket stove is improved by introducing counter-flow burning
mechanism. Please check the video in the following address:
http://www.youtube.com/watch?v=kID0YL6TyqA
I have been invited by Prof Anderson to join this discussion group, a
year
ago. Due to my bad English, I am not very confident to write an article
in
discussion group. However, I always check if there is a new one.
With best regards
M. Nurhuda
Malang, Indonesia
[email protected]
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