by Teong H. Tan Link...
DATS cooker employs 24 small reflective panels to concentrate extra sunlight to compensate for the heat loss from not using a plastic bag. DATS cooker design is similar to a deep-focus parabolic cooker, but instead of using a true parabolic curve, multiple flat panels concentrate sunlight onto the cooking pot. Two reflective surface-angles, 45º and 60º, are used so that a bend can be introduced in between for structural rigidity to hold the cooker’s shape. This structural rigidity allows for DATS cooker to be constructed out of cardboard material.
A DATS cooker, tested in Shanghai, reached a maximum temperature of 140ºC (284ºF) inside an empty black cooking pot, on a clear sunny day with 21ºC (70ºF) ambient air temperature and a slight breeze. Eggs became hard-boiled in 30 minutes and two cups of rice cooked in 95 minutes. The cooker should be re-positioned every 45 minutes or less for better efficiency. Detail...
