[Stoves] the 150 gasifier in operation in Vietnam

Sat Mar 3 17:16:58 CST 2012

Richard,

You said: *While you note, Paul that the domed screen prevents fine
particulates I wonder if it is not doing something much more than that by
way of heat transfer as well?*

It makes a big difference with regard to heat transfer.
Without the wire mesh dome, it would take more than 8 minutes to bring a
liter of water to a boil.
With the wire mesh dome, it takes less than 4 minutes.
So I suppose that wire mesh dome doubles the amount of heat that makes it
to a pot.

I would encourage all of you who design natural draft TLUDs to consider
putting a wire strainer over the burner.
On a reactor diameter of 150 mm, the radius of my wire mesh dome is 116 mm.
Also I would recommend that the dome fit snugly over the burner.
Do not allow outside air to flow freely underneath the dome.
Air will enter through the wire mesh of the dome.

If you have a housing around the reactor,
 let the housing provide the main feed of air to the dome.
If the wire mesh has small openings,
 the dome will restrain the flow of air coming from the housing.

Note also that the dome shields the flame from wind.
Wind does not disturb the flame in any way.

All flames should be on the inside the dome.
If flames appear on the outside of the dome, the dome no longer emits
radiant energy as it should.

Thanks.
Paul

On Sun, Mar 4, 2012 at 2:15 AM, Richard Stanley <rstanley at legacyfound.org>wrote:

> Interesting notes about a very nice stove; Whn we get to blue flames and
> that kind of power output with the spark of a lighter, we are home !
>
> outdoor propane radient heaters use same gas screen. Think it is
> converting convective energy to radiant energy frankly as the heat travels
> nicely downward  several feet to the seated customer with great effect in
> 50 degree nights  (radient travels in all directions, while  convective
> emmanates "heat" mostly in the upward direction).
> Without said screen wrapped cylindrically around the burner (up under this
> ~7 ft tall umbrella  shaped device, the exposed blue jet flames generate
> almost no heat whatsoever in the downward direction, going instead,  mainly
> up.
>
> Of course, the direction of travel is not the issue with Paul's incredible
> stove but the fact that the screen appears as near infrared has me
> wondering.
>
> There was a brilliant guy in Washington state several years back who
> invented the Pyromid stove, a wide collapsible inverted albeit very shallow
> pyramid shaped braii which worked with only a small handful of charcoal at
> its center base. The shiny metal sides of the inverted pryamid base were
> definately not designed for thermal insolation at all; It was however very
> reflective  and seemed to accomplish a very efficient radiation of the
> radient energy of the burning charcoal up onto the braii grill. The Pyromid
> stove  has been taken over by Ecoque company now.
> While you note, Paul that the domed screen prevents fine particulates I
> wonder if it is not doing something much more than that by way of heat
> transfer as well?
> Richard Stanley
>
>
> On Mar 3, 2012, at 10:14 AM, Andrew C. Parker wrote:
>
> Paul O.,
>
>
> Your wire mesh dome is brilliant, good old fashioned trial and error work.
>
> Did you try the radiant mesh on your propane burner?
>
> A few years ago I ran across a design for a very low pressure gas radiant
> heater, <http://cerem-infraconic.com/default-eng.php>, and wondered if
> something like it could be adapted for a gasifier or rocket stove.
>
> These are the US patent numbers:
>
> 5060629
> 6461150 B1
> 6612834 B2
>
> Some additional patents for low pressure radiant heaters, referenced by or
> making reference to the above:
>
> 4452225
> 7631640
>
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-- 
Paul A. Olivier PhD
27C Pham Hong Thai Street
Dalat
Vietnam

Louisiana telephone: 1-337-447-4124 (rings Vietnam)
Mobile: 090-694-1573 (in Vietnam)
Skype address: Xpolivier
http://www.esrla.com/
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