Frank,
see below
Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: [email protected]
Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
On 9/20/2013 12:45 PM, Frank Shields wrote:
*Thanks Ron,*
**
*I was surprised to see snakes as being one of the problems listed on
page ten. Wonder what kind?*
*I think snakes were added to give some issue that would have low threat
(10 being low and 1 is high).*
**
**
*Surprised to see twisted tape adding efficiency as I would think that
would just remove heat that was on its way to the pot.
*
They twisted tape (TT) is quite small and will be up to full temperature
quite quickly. After that, they to not remove any more heat. But the
added turbulence continues. And seems to have substantial impact.
The test of the TT could easily be done in the Rocket stoves that have
been tested so many times. Does 1 or more TT have impact there?
TT is one of several major designs for turbulence. Looks like an
important topic for more study (and does not require fancy expensive
equipment.
**
**
*Now that all this info is available this would be a good place to
test different fuels, stoves etc. All of the 'six box' variables now
controlled and we can swap out one at a time to see what happens.
Re-arrange to report the following in order: *
**
*Review of the six variables:*
*1)**Fuel(s)*
*2)**Fuel manipulation between box1 and box 3*
*3)**Stove(s)*
3-A) Stoves with fixed positions of the pot
supports in relation to the combustion zone.
3-B) Stoves that have ease of changing the
distance between the combustion device and the pot supports, allowing
for "Manipulation between combustion device and the stove
structure). Paul
**
*4)**Cooking utensil*
*5)**Manipulation between box 4 and box 6*
*6)**Task(s)*
*Calculations from Fuels > Tasks give the efficiencies. *
**
*Regards*
**
*Frank*
**
**
**
*Frank Shields*
*Control Laboratories; Inc.*
*42 Hangar Way*
*Watsonville, CA 95076*
*(831) 724-5422 tel*
*(831) 724-3188 fax*
*[email protected]*
*www.controllabs.com*
**
**
**
**
**
**
**
*From:*Stoves [mailto:[email protected]] *On
Behalf Of *Ronal W. Larson
*Sent:* Thursday, September 19, 2013 10:43 AM
*To:* Discussion of biomass
*Subject:* [Stoves] A doctoral thesis on stoves
List:
1, I recommend this recent new (free) technical stove paper:
http://www.energsustainsoc.com/content/pdf/2192-0567-3-16.pdf
2. This is a shortened but still lengthy version of an Indian
doctoral thesis. It concentrates on one village and one type of
stove, providing extensive testing and good reporting on especially
the amount of fuel consumed (mostly for water boiling) and the time
taken to acquire it.
3. The main new feature is on using a simple low cost means of
getting swirl and thereby better gas mixing. The addition is called a
TT - twisted tape. Seems like it is adding 5% to stove efficiencies
(which started in the 20-25% range), otherwise no changes to these
tradition stoves. The paper provides a good review of almost
everything else about simple stoves, including comments on WBTs. The
TTs should be applicable to Rockets, TLUDs, etc.
4. I have lost how I came to read it. But think it came from
this site: https://www.engineeringforchange.org/news/categories/energy/
Ron
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