Write (a) Construction (b) Working (c) Advantage (d) Limitations of a solar cooker
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Construction:
This solar box consists of a box made of non-conducting materials like plastics, fiber glass or wood. The walls of the box are made thick so as to minimise loss of heat due to radiation and is painted all black from inside. The box is covered with a thick glass sheet, G. A plane mirror reflector, R is attached in the inside cover of the box.
Working:
The food to be cooked is kept in the container which is painted black from outside. The container is kept in the box and it is then covered with glass sheet. In order to cook the food, the solar cooker is kept in the sunlight. Reflector R is adjusted in such a way that a strong beam of light falls on the cooker top after reflecting from the mirror. Sun rays are absorbed by the black surface of the box, after passing through the glass surface. The glass sheet does not allow the heat rays to escape, once they enter the box. In this way more and more heat gets trapped in the box and a temperature of 100°C—140°C is attained within two to three hours which is sufficient to cook the food like rice, dal and some vegetables kept in the black containers.
Thus, these cookers can be used to cook food items that require slow heating and cannot be used for frying etc.
Advantage:
High-performance parabolic solar cookers can attain temperatures above 290 °C (550 °F). ... Vacuum tube type cookers can heat up even in the clouds and freezing cold.
Limitations:
Cooking with solar cookers obviously requires sunlight, which makes it difficult to use during winter months and on rainy days. Cooking also takes a significantly longer time compared to conventional methods. Users must schedule their cooking time and maximize the use of sunlight.
This solar box consists of a box made of non-conducting materials like plastics, fiber glass or wood. The walls of the box are made thick so as to minimise loss of heat due to radiation and is painted all black from inside. The box is covered with a thick glass sheet, G. A plane mirror reflector, R is attached in the inside cover of the box.
Working:
The food to be cooked is kept in the container which is painted black from outside. The container is kept in the box and it is then covered with glass sheet. In order to cook the food, the solar cooker is kept in the sunlight. Reflector R is adjusted in such a way that a strong beam of light falls on the cooker top after reflecting from the mirror. Sun rays are absorbed by the black surface of the box, after passing through the glass surface. The glass sheet does not allow the heat rays to escape, once they enter the box. In this way more and more heat gets trapped in the box and a temperature of 100°C—140°C is attained within two to three hours which is sufficient to cook the food like rice, dal and some vegetables kept in the black containers.
Thus, these cookers can be used to cook food items that require slow heating and cannot be used for frying etc.
Advantage:
High-performance parabolic solar cookers can attain temperatures above 290 °C (550 °F). ... Vacuum tube type cookers can heat up even in the clouds and freezing cold.
Limitations:
Cooking with solar cookers obviously requires sunlight, which makes it difficult to use during winter months and on rainy days. Cooking also takes a significantly longer time compared to conventional methods. Users must schedule their cooking time and maximize the use of sunlight.
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