Second rapid boiling test - Jim Ross

["New Dawn Engineering /ATEX" <crispin@newdawn.sz>]

Dear Stovers

Jim Ross has given the rapid boil a go.  He cut the wood into large squarer
chunks though he did take them from the same plank I used.

He used newspaper which was a bit damp today and he was given 6 gms to work
with.  This is half a sheet from a small newspaper.

Details:

Date of Test  8 January 2002, 5:15PM
Mean air temperature 19 deg C and raining slightly
Mass of water    1000gm
Mass of aluminum pot    514gm (the test was done with a closed pot)
Mass of water + pot    1514gm
Mass of paper used to ignite kindling    6gm
Mass of pine fuel put into the basket grate    320gm
Mass of all fuel in the basket grate    326gm
Mass of fuel added during the test    None
Mass of fuel and ash remaining after removing the pot (est)    30gm
Mass of water + pot at 4 minutes 15 seconds    1402gm
Initial Water temperature 22 deg C
Final water temperature    98 deg C

With the two of us present we were able to lift the assembled stove up to
light the fire and start the clock as so as the damp newspaper was lighted.
The fact that is was raining seemed to affect the initial combustion quite a
bit and the secondary burning did not kick in until quite a bit later than
it did yesterday.  I feel that this was due to the lower surface area of the
pine pieces (being thicker in section) and the paper bing so humid.  The
lower ambient temperature was a factor in this, as was the very high
relative humidity.

Sincerely,
Crispin

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

Time    Temp
Sec      Deg C
0            22
5            24
10          25
15          26
20          27
25          28
30          29
35          29
40          30
45          32
50          33
55          35
60          35
65          36
70          39
75          39
80          40
85          41
90          41
95          42
100        43
105        47 (secondary combustion kicked in)
110        49 (this normally happens at 50-80 seconds)
115        52
120        55
125        61
130        66
135        70
140        71
145        78
150        81
155        86
160        88
165        90
170        95
175        97
180        97
185        98    Full Boil @ 3:05
190        98
195        98
200        98
205        98    Fuel subtantially consumed
210        98
215        98
220        98
225        98
230        98
235        98
240        98
245        98
250        98
255     End

Water heated:    1000gm from 22 to 98 deg C
Water boiled:    113 cc @ 98 Deg C
Boiling rate avg 1.6 cc per second (1.65 KJ/sec)
Total energy applied over 4:15    4.44MJ
Water absorbed    1000x (98-22) + 113*1025 = 192,825 J
Efficiency    4.3%

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

Experimenter: Jim Ross
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 514 gm, tested with the lid.
Fuel:    Pine, air dried in summer.
Clearance between the pot and the fire passages:    25mm
Fuel consumed during the test:    296 gm (est).


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