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Experimenting the
positioning of cooking pots in solar cookers.
During visit to solarcooking.org site there is a topic
requiring attention, i.e. whether to stack the cooking pots side by side or to
stack them?
While experimenting with modified funnel cooker
"Parvaticooker" we found that stacking works better. Details of our experiment
are given below.
Our next goal was to
cook 2-3 different dishes. For this purpose we used a large stand and placed
three identical pots as above side by side, with 750 ml of water in each. We
measured temperature in all three pots after 90 minutes and readings were 70 0C,
77 0C and 77 0C there was no improvement with different
positioning pattern.
|
|
Cooking pots side by side |
Cooking pots stacked on each other |
Then it was decided
to work with pots stacked on each other. With available aluminum pots we were
able to stack only two pots. We decided to work with stainless steel pots that
come with pressure cookers. In aluminum pots we placed 750 ml of water while in
SS pots we placed 1 liter water in large pot and 750 ml water in smaller pot. (
SS pots had diameter of 6.25 " , height of big pot is 2.75" small pot
is 1.75")
Temperatures recorded after 80 minutes is given in table
|
Aluminum |
SS |
Pot at top |
85
0C |
85 0C |
Pot at Bottom |
96 0C |
85 0C |
This test clearely showed that stacking of cooking pots works
better than keeping them side by side in concentrator type cookers
We repeated same experiment with three SS pots stacked on each
other.
Temperatures recorded after 90 minutes is given in a table
below.
Top pot |
500 ml of water |
83 0C |
Middle pot |
500 ml of water |
83 0C |
Bottom pot |
750 ml of water |
83 0C |
|
|
Three SS pots Stacked |
Two aluminum solar cooker pots |
From this result it is evident that solar
cooker with does even heating of pots in stacked position.
Some friends advised us to use aluminum cooker pots which are
used in box type cookers. We again repeated the above experiment by using these
containers (Dimensions 6" diameter and 3" height). Temperatures
recorded after 90 minutes are as given below.
Top container |
750 ml of water |
78 0C |
Bottom container |
750 ml of water |
95 0C |
|
|
Pressure cooker containers |
Aluminum Solar cooker containers |
While trying to find out the reason for this variation we
found that even though aluminum is better conductor these containers have lids
and contact between them is not perfect. SS cooker containers are made to fit
tightly on each other. Getting similar aluminum containers has been difficult so
far, since people tend to by only SS containers.
Parvati Solar cooker. We are selling 26" diameter Parvati solar cooker with fabricated rotating metal stand and hard anodized reflector. Price Rs 4399/- FREE SHIPPING within India.
Full size plans available. (Full size Plans of 24 sided 26 inch diameter cooker only printed copies available.Us$ 8 as printing and postage charges)
Mrs. Parvati Green Tech Enterprises, Sahakar Nagar, Parvati, Pune India Pin 411 009.
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