Re: Basintuthu Stove Flame temperature test 1

["Kevin Chisholm" <kchishol@fox.nstn.ca>]

Dear Crispin

Thanks very much for your comprehensive "Stove Test Reports". We all learn
from them, in terms of a methodology in conducting tests, and we get an
appreciation of what you think is important, and how you proceed to
implement change, and track results.

Thanks.

Kevin Chisholm
----- Original Message -----
From: "Crispin" <crispin@newdawn.sz>
To: "Stoves" <stoves@crest.org>
Sent: Saturday, January 19, 2002 3:21 PM
Subject: Basintuthu Stove Flame temperature test 1


> 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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