Stoves Archive for January 2002

With the stop watch running, I balanced three paint cans on the upper part
of the stove to increase the draft.  By the time I finished this process the
fire was smoking hard.

I would have preferred to have the chimney in place, the pot covered and the
watch started when the flame hit the paper but I am working alone here.  I
was recording the time the pot was on the heat and the 'head start' the fire
got was minimal.

The fire shield around the pot was not present during this test which would
have increased the heat transfer to the pot sides, however the pot was
encased by the chimney protecting it from any wind.

I let it burn. The combustion 'went secondary' after about 45 seconds
leaving me with substantially clean smoke and I could look down the paint
cans and see the top of the water in the open pot, in theory.

Unfortunately there was so much combustion product coming at me and what
with the pot being underlit with a roaring red-fellow flame, and the water
being in the dark, so I couldn't see the water surface.  I ran to the
pick-up truck for a powerful flashlight to shine down and this allowed me to
take a peek occasionally.

Before 1 minute 30 I heard the sound of boiling and I shone the light down
through the fumes.  I could hear strong hissing and clearly see that the top
of the water was severely agitated but I was not sure if it was perhaps
caused by the roaring fire and gasses passing around the pot.

I let it run until the 2 minute mark and removed the three paint cans.  It
was boiling vigorously.  I left the pot boiling without the extra draft for
another 30 seconds.

At 2 minutes 40 seconds I removed the pot from the stove and placed it on
the scale and let it stabilize.  I found that the water had come to a full
boil and that additionally 80 gm of water had boiled off in that time of
2:40.

+++++++++++++++

Description of the Stove
Name:    Basintuthu Single Pot Stove (pronounced bah-sin-DOO-too)
Class:    Bottom lighting with preheated primary and secondary air
Air Control:    None during this test.  All air passed throught the 5 x 40mm
air control holes unhindered.
Grate:    140mm diameter, 255mm long, cylindrical, open grated lower end,
made from 1.2mm stainless steel.
Pot:    230mm aluminum pot weighing 510 gm, tested without the lid.
Fuel:    Pine, air dried in summer.
Clearance between the pot and the fire passages:    25mm
Fuel consumed during the test:    Over 200 gm, not sure exactly.

+++++++++++++++
END


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