solar cooker
Write a note on solar cooker.
ANS:
* Solar cooker is a device that uses solar energy in the form of heat for cooking food.
* As shown in figure, solar cooker consists of a container box whose body is made up of nonconducting plastic or fibrous material and insulated from outside to prevent heat loss.
* A plane mirror is fixed on the top of the box inb such a way that it reflects sunrays into the box.
* Solar cooker contains small containers painted black externally to absorb heat.
* The box is covered with a glass-sheet to retain the heat inside due to greenhouse effect. This heat develops about 100-140°C temperature inside the box within 2-3 hours when placed in sunrays.
* This type of cooker can be used to prepare food items like rice, dal, pulses, vegetables,etc.
* ADVANTAGES
1. There is no combustion of fuel.
2. Maintenance is negligible.
3. It is pollution-free.
4. The natural taste of the food is maintained as it conserves all nutrients.
5. During the preparation of food no personal attention is needed.
* LIMITATIONS
1. Food cannot be cooked on a cloudy day or in absence of direct sunlight
2. It takes very long time for cooking.
|