15
Table 6 Controlled Cooking Test statistical results t- test for the cookstoves α = 0.05 at
Ghana Standards Authority Chorkor-KOSMOS and FTT.
1. CCT results: Chorkor- KOSMOS
units Test 1
Test 2 Mean
St Dev Total weight of food cooked
g 19944
20354 20149
289.9 Weight of char remaining
g 1105
577 841
373.4 Equivalent dry wood
consumed g
55745.5 26642.7 41194.
1 20578.8
Specific fuel consumption gkg
2595.1 2013.0
2304.1 411.6
Total cooking time min
434 302
368 93.3
2. CCT results: FTT units
Test 1 Test 2
Mean St. Dev
Total weight of food cooked g
17913 16894
17403. 5
720.5 Weight of char remaining
g 400
500 450
70.7 Equivalent dry wood
consumed g
29345 17174
23259. 5
8606.2 Specific fuel consumption
gkg 1438.2
1016.6 1227.4
298.1 Total cooking time
min 385
402 393.5
12.0 Comparison of Stove 1 and
Stove 2 difference
T-test Sig
95? Specific fuel consumption
gkg 0.4672974 2.9959
27 YES
Total cooking time min
-0.0692935 -0.3832 NO
Chorkor- KOSMOS
FTT
Processing rate gmi
n 54.752717
44.22 745
Yield 19.223
29
4.1.1 Total Weight of Food Cooked
Total weight of food cooked for the various stoves were determined to be 57756.5 and 54257.5 g for Chorkor-Ada and Morrison stoves respectively and 19484 and 19108.5 g for
Chorkor-Otuam and AWEP respectively. The analysis showed no significant difference between the means at a particular location.
Total weights of food cooked were determined to be 20149 and 21249.5 g for Chorkor- KOSMOS and KOSMOS Oven stoves respectively. There was no significant difference
between the means.
Total weights of food cooked were determined to be 20149, 21249.5 and 18714 g for Chorkor-KOSMOS, KOSMOS Oven and TULLOW Oven respectively. There was no
significant difference between the means.
16
The total weight of food cooked using the FTT was determined to be 17403.5 g. There was no significant difference between the means Chorkor-KOSMOS and FTT.
4.1.2 Equivalent Dry Wood Consumed
Equivalent dry wood consumed for the various stoves were determined to be 45455.9, 26310.1, 34805.8 and 28389 g for Chorkor, Morrison, AWEP and Chorkor-Otuam stoves
respectively. The analysis showed that there was a significant difference between the means.
Equivalent dry wood consumed were determined to be 41194.1, 26214 and 74145.3 g for Chorkor-KOSMOS, KOSMOS Oven and TULLOW Oven respectively. The analysis showed
that there was a significant difference between the means.
Equivalent dry wood consumed for the FTT stove was determined to be 23259.5 g and compared to Chorkor-Ada. The analysis showed a significant difference between the means.
Figure 7 Shows that the TULLOW Oven used more dry wood than any of the stoves. The weight of raw fish used on the Chorkor-Ada and Morrison were more than the other test
locations.
4.1.3 Specific Fuel Consumption
The specific fuel consumption were determined to be 494 and 313.2 gkg for Chorkor-Ada and Morrison stoves respectively. The analysis shows that there was a significant difference
between the means 95 confidence level and determined to be 36.6 - YES i.e. fuel
saving of 36.6 but does not meet the EnDev requirement of 40. The specific fuel consumption were determined to be 1822.5 and 1461.8 gkg for Chorkor-
Otuam and AWEP respectively. The analysis showed that there was no significant difference between the means and was determined to be 19.8 - NO; Sig. 95 confidence level i.e.
fuel saving of 19.8 which does not meet the EnDev requirement of 40.
57.7565 54.2575
19.1085 19.484
20.149 21.2495
18.714 17.4035
45.4559 26.3101
34.8058 28.389
41.1941 26.214
74.1453 23.2595
10 20
30 40
50 60
70 80
Chorkor-Ada Morrison
Chorkor-Otuam AWEP
Chorkor-KOSMOS KOSMOS Oven
TULLOW Oven FTT
Weight [kg] S
to v
e
STOVES TEST PERFORMANCE
EQUIVALENT OF DRY WOOD USED WEIGHT OF FOOD COOKED
17
The specific fuel consumption was determined to be 2304.1 and 2820 gkg for Chorkor- KOSMOS and KOSMOS Oven respectively. The analysis shows that there was no significant
difference between the means and was determined to be -22.4 95 confidence level i.e. fuel loss of 22.4 and therefore does not meet the EnDev requirement of 40. When
compared the Chorkor-KOSMOS to TULLOW Oven 3667.9 gkg, the analysis showed that there was a significant difference between the means -59.2 95 confidence level
i.e.
fuel loss of 59.2. By comparing the KOSMOS and TULLOW Oven, it was realised that there was a significant difference between the means -30 95 confidence
level i.e. fuel loss of 30.
Figure 8 Summary of stoves test performance specific fuel consumption.
The specific fuel consumption for the various stoves were determined to be 2820 and 1227.4 gkg for Chorkor-KOSMOS and FTT respectively. The analysis shown that there was a
significant difference between the means and was determined to be 46.7 95 confidence level i.e.
fuel saving of 46.7 and therefore met the EnDev requirement of 40. Note that these particular two stoves used different fuels firewood and charcoal respectively
and test was also performed under different environmental conditions.
The specific fuel consumption of the various stoves is presented in Figure 8. Among the stovesovens, the TULLOW Oven consumed most the fuel followed by the KOSMOS
Oven and Chorkor-KOSMOS. This may be due to the oven design technology where the fire was not directly under the fish, sizing of the oven and firepot direction to the wind
flow.
4.1.4 Total Cooked Time Total cooked times for the stoves were determined to be 312, 285, 765 and 709 min for
Chorkor-Ada, Morrison, Chorkor-Otuam and AWEP respectively. The analysis shown that there was no significant difference between the means and the difference was determined to
be 5.7 for Chorkor-Ada and Morrison; and 7.2 for Chorkor-Otuam and AWEP 95 confidence level i.e. time
saving of 5.7 and 7.2 respectively. The trays were not of
500 1000
1500 2000
2500 3000
3500 4000
Chorkor-Ada Morrison
Chorkor-Otuam AWEP
Chorkor-KOSMOS KOSMOS Oven
TULLOW Oven FTT
Specific Fuel Consumption [gkg] S
to v
e
STOVES TEST PERFORMANCE
18
the same dimensions therefore only one firepot was used for the Morrison and Chorkor- Otuam.
At Ankobra, the total cooked times determined were 368, 465 and 611 min for Chorkor- KOSMOS, KOSMOS Oven and TULLOW Oven respectively. The analysis showed no
significant difference between the means and was determined to be 26.4 and 31.4 for Chorkor-KOSMOS and KOSMOS Oven; KOSMOS Oven and TULLOW Oven respectively
95 confidence level i.e. time
saving of 26.4 and 31.4. There was a time saving of 66 when using the Chorkor-KOSMOS relative to TULLOW Oven.
Total cooked times were determined to be 368 and 393.5 min for Chorkor-KOSMOS and FTT respectively. Analysis showed that there was no significant difference between the
means and the difference was determined to be 6.9 95 confidence level i.e. time saving of 6.9.
Figure 9 Summary of stoves test performance total cooking time.
From Figure 9, it was observed that Chorkor-Otuam, AWEP, KOSMOS Oven and TULLOW Oven spent more than 400 min to cook the quantity of fish.
4.1.5 Processing Rate It was determined that the processing rates were 185.1 and 190.4 gmin for the Chorkor-Ada
and Morrison stoves respectively. This gave an increased in production by 2.8 when using the Morrison stove. In this test, only one side of the Morrison tray one fire pot was used.
Processing rates of 25 and 27.5 gmin were determined for Chorkor-Otuam and AWEP respectively which gave an increased in production by 9.0 when using the AWEP stove. In
this test, only one side of the tray one fire pot of the Chorkor-Otuam was used.
It was determined that the processing rates of 54.8, 45.7 and 30.6 gmin for Chorkor- KOSMOS, KOSMOS Oven and TULLOW Oven respectively. Comparisons were made
between Chorkor-KOSMOS and KOSMOS Oven; Chorkor-KOSMOS and TULLOW Oven; and KOSMOS Oven and TULLOW Oven. These gave an increased in production by 16.6,
100 200
300 400
500 600
700 800
900 Chorkor-Ada
Morrison Chorkor-Otuam
AWEP Chorkor-KOSMOS
KOSMOS Oven TULLOW Oven
FTT
Total Cooking Time [min] S
to v
e
STOVES TEST PERFORMANCE
19
44.2 and 33 in favour of Chorkor-KOSMOS, Chorkor-KOSMOS and KOSMOS Oven respectively.
Processing rates were determined to be 54.8 and 44.2 gmin for Chorkor-KOSMOS and FTT stoves respectively. This gave an increased in production by 19.2 when using the Chorkor-
KOSMOS stove.
Figure 10 Summary of stoves test performance processing rate.
In Figure 10, it was determined that Morrison and Chorkor-Ada processed more fish with a lesser time than rest of the stoves.
The bulk moisture contents of the smoked fish on the stoves at the various locations were determined to be as follows: Ada-Foah Chorkor = 47.7 and Morrison = 39.4; Otuam
Chorkor = 60.4 and AWEP = 58.3; Ankobra Chorkor-KOSMOS = 59.5, KOSMOS Oven = 55 and TULLOW Oven = 59.2 and GSA FTT = 63.4.
4.1.6 Emissions
