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SOLAR THERMAL TECHNOLOGY
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BOX TYPE SOLAR COOKERS
It has four main parts i.e., outer box, main
cover with mirror/reflector and double walled glass lid
for the inner box. Each cooker is provided with a set
of four/three cooking vessels.
WORKING PRINCIPLE:
The Solar cooker is to be kept in the sun
in open space free from any shadow. Adjust the cooker
in such a way that the reflecting mirror faces the sun
and adjust the angle of the mirror to let the reflected
rays fall on transparent glass lid. Tighten the position
of the mirror with fixing hinges.
Place the cooking vessels inside the cooker
and close the lid property. It is necessary to adjust
the direction of the cooker after every 25-30 minutes
such that the mirror always faces the sun and reflected
rays fall on double glass lid. The time taken to cook
three/four dishes at a time will depend on the type of
food to be cooked and season and also varies between one
hour to over two hours on a clear sunny day. It is also
acts a hot pack since it keeps cooked food hot for (4)
to (5) hours.
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Advantages: |
- Saves conventional fuel
viz., wood, kerosene, LPG & Electricity etc., per
annum to the extent of
- 750 Kgs of fire wood;
- 120 Lts of kerosene;
- 80 Kgs of LPG
- 350 units of electrical energy.
- Requies no personal attention while cooking.
- Solar cooking is a hygienic cooking, safe
cooking. It preserves the nutritional value of the food.
- Pollution free.
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DISH SOLAR COOKER (SK-14)
This
is a concentrating type parabolic dish solar cooker with aperture
diameter of 1.4 meter and focal length 0.28 meter. The reflecting
material is anodized aluminum sheets having reflectivity of over
75% and reflection stand. Instantaneous power available at the
bottom of the cooking vessesl is about 0.6 K.W.
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Working Principle:
The cooking vessel is to be kept in the stand
arranged at the focal point of the cooker. The temperature
attained at the bottom of the vessel could be around 350
0 to 400 0 C. This temparature is sufficient for roasting,
frying and boiling. This cooker can cook food for 10-15
people. This cooker can be used from 8 a.m. to 4.00 p.m.
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Salient Features: |
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- Economical and echo friendly.
- Pressure cookers upto 12 lts., capacity
can be used.
- Useful for sterilization.
- Saves about 10 LPG cylinders per annum
and pay back period 1 ½ to 2 years.
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| COMMUNITY SOLAR COOKER FOR INDOOR
COOKING (SCHEFFLER)
Unique feature of this cooker is that it is possible cook
using solar energy within the kitchen itself.
A 7 or 9.5 sq.mt reflector placed about 10 ft. away from
opening of north wall concentrates solar rays on the secondary
reflector placed in the kitchen which in turn deflects
the same on the cooking vessel. The cooker is ideal for
community cooking. Food for about 50 people can be cooked
with one dish. Instantaneous power available at the bottom
of the cooking vessel is about 2 Kw. |
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Salient Features |
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- Temperature attained at the bootm of the
vessel is about 400 0 c
- Facilitates indoor cooking.
- Automatic tracking of the sun after initial
setting of the system in the morning.
- Conventional fuel saving.
- Around 35-40 LPG cylinders per year on
full use in community kitchens.
- Pay back period 4-5 years.
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