Solar cooker is a device that is used to cook food. It is of two types i.e. box type and concave reflector type It contains an insulated box painted black from inside. Inside it copper tube are placed in the form of coils. Tubes are also painted black from outside. The box is covered with a glass. Why is the copper tube of a solar water heater painted black from the outside? *
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Box-type solar cooker
Spherical-reflector type solar cooker
Plane mirror is used as a reflector
Concave or parabolic reflector is used.
It does not concentrate solar energy at a point
It concentrates the solar energy at a point called focus
Comparatively low temperature is produced in it
Very high temperature is produced
It is used to cook the food materials which require slow heating
It can cook food materials which require strong heating
Baking and frying is not possible in it. Baking and frying can be done in it.
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The copper pipe of solar water heater is painted black in colour from outside so that maximum amount of heat rays of the sun is absorbed and the coherence of solar water heater is increased.
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