Paul it looks like Alex is onto something.
Clearly infra red has a substantial added effect even at the expense as Alex
suggested, of "dumming down" (my interpretation) those blue flames to the
seemingly less (conductively) efficient but far more Ir efficient red yellow
flame or at least red glowing dome.
The added benefit of using the dome, may be that by using such a dome one is
able to stabilise the optimum distance between pot and heat source. Otherwise,
one has to deal first with convective heat, with the pot at a relative greater
distance, then, as the flames recede to glowing embers, one has to either add
more fuel to maintain the convective heat mode, or sink the pot into the embers
to maintian the same heat input to the pot. But then again you are gassifying
your fuel. My supposition would more likely only apply with a natural
convection stove eh?
Richard Stanley
www.legacyfound.org
On Mar 13, 2012, at 9:38 PM, Paul Olivier wrote:
Alex,
I took three sets of temperature readings with and without the dome.
With Without
Reading 1 - 500 C 563 C
Reading 2 - 473 C 578 C
Reading 3 - 470 C 571 C
All measurements were taken at the same height above the burner.
With the dome, the probe remained its normal color.
Without the dome, the probe got red hot.
The burner that I am using is a Belonio burner.
In a first step I added a burner housing to the Belonio burner.
In a second step I added the dome.
I can't imagine that the burner housing alone accounts
for the much better boiling time that I get in comparison to Belonio.
I am totally at loss in explaining these temperature readings.
Paul
On Wed, Mar 14, 2012 at 9:41 AM, Alex English <[email protected]> wrote:
Paul,
If your thermocouple is small enough you might try mounting it suspended inside
a short piece of tubing. Copper or thin steel would equalize quickly. You
could even crimp the open ends a bit. The idea is to allow some through flow of
hot gases while reducing the radiant losses and gains to and from the
surrounding sphere of influence. It would give a second set of numbers for
people to comment on.
Alex
Yesterday I bought a thermocouple that can measure up to 1,000 C.
This morning I will use it to measure temperature with and without the dome.
Both measurements will be taken at the same height above the burner (the height
of the pot).
Any suggestions?
Paul
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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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