A box cooker has a transparent glass or plastic top, and it may have additional reflectors to concentrate sunlight into the box. The top can usually be removed to allow dark pots containing food to be placed inside. One or more reflectors of shiny metal or foil-lined material may be positioned to bounce extra light into the interior of the oven chamber. Cooking containers and the inside bottom of the cooker should be dark-colored or black. Inside walls should be reflective to reduce radiative heat loss and bounce the light towards the pots and the dark bottom, which is in contact with the pots. The box should have insulated sides. Thermal insulation for the solar box cooker must be able to withstand temperatures up to 150 °C (300 °F) without melting or out-gassing. Crumpled newspaper, wool, rags, dry grass, sheets of cardboard, etc. can be used to insulate the walls of the cooker. Metal pots and/or bottom trays can be darkened either with flat-black spray paint (one that is non-toxic when warmed), black tempera paint, or soot from a fire. The solar box cooker typically reaches a temperature of 150 °C (300 °F). This is not as hot as a standard oven, but still hot enough to cook food over a somewhat longer period of time.

A Solar Oven made of cardboard, newspapers, and reflective tape

Panel solar cookers are inexpensive solar cookers that use reflective panels to direct sunlight to a cooking pot that is enclosed in a clear plastic bag.


Scheffel dish

Material

Reflectivity

Mirror fixing

Thickness

Temperature  and Wind Presser

 

16 Sq.m. aperture area.

 

Solar grade glass mirrors with protective layers
Of  coating on back surface.

 

90% min. With life 15 to 20yr.

 

With positive locking or sticking by good Quality adhesives. Due to protection of mirror coating to be taken while fixing the mirrors and high winds of region.

 

0.4mm anodized aluminum sheets.

 
400degreetemp.
Wind speed up to 150km/hrs.
Tracking accuracy : +/- 0.5 degree .
(to be ensured using inclinometer).