Basintuthu Stove Flame temperature test 1

["Crispin" <crispin@newdawn.sz>]

Dear Stovers

Date of Test  19 January 2002, 2PM
Mean air temperature 23 deg C, humid and overcast, rain the night before
Mass of water    1000gm
Mass of tin can    212gm (the test was done with an open can)
Mass of paper used to ignite kindling    4gm
Mass of pine fuel put into the basket grate    126gm
Mass of all fuel in the basket grate    130gm
Mass of fuel added during the test    None
Mass of water + can at 2 minutes 40 seconds    1212gm
Initial Water temperature 23 deg C
Final water temperature     92 deg C

Method
This was a test of the gas temperature 50mm from the side of, and 15mm below
the bottom of the can.  This is not the highest temperature point but much
of the gas that passes around the pot is at this temperature.  The fire was
lighted with a butane lighter.

The wood felt slightly moist, not tinder dry, having sat on a concrete floor
near a large barn doorway through a rainy night.  The newspaper was better
to the touch.  It all burned well.  The weather seems to have a great deal
of influence on the tests, especially the relative humidity.

Several people participated in the test as it required a stopwatch holder, a
temperature reader, a record taker (Blythe Walker) and a fire lighter (me).

A 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 a 3-paint can chimney protecting it from any wind while providing
additional draft.

The combustion 'went secondary' after about 32 seconds.

+++++++++++++++
Time in          Temp
Seconds      Degrees C
0                    28
5                    29
10                  33
15                  48
20                  69
25                  121
30                  200
35                  322    Secondary combustion started
40                  427
45                  431
50                  440
55                  472
60                  505
65                  514
70                  552
75                  559    Gas Temperature peak
80                  555
85                  552
90                  525    Fuel pretty much exhausted
95                  488
100                437
105                406
110                396
115                383
120                363    Embers and small amount of charcoal
125                336
130                315
135                296
140                275
145                255
150                245
155                232
160                223    Small amount of ash remaining, no charcoal

+++++++++++++++
Comments
We were operating the stove at its maximum potential heat output and these
are not considered to be representative of meal-cooking conditions.

The water in the can did not boil.  This was a surprise because in previous
tests this was achieved easily.  We suspected the moisture content of the
wood, the high relative humidity and possibly air starvation as the causes
of this.

The test was very brief (160 seconds) and we feel the gasses did reach
realistic and sustainable temperatures.

+++++++++++++++
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, 1.2mm thick stainless steel cylinder,
open grated lower end
Pot:    Tin can 127mm dia 195mm high.
Fuel:    Pine, air dried in summer.
Clearance between the pot and the fire passages: 25mm underneath, 78mm on
each side (cylindrical can in a cylindrical stove)
Fuel consumed during the test:   130 gm

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




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