Nova energie introduced the Solar dryers are device that use solar energy to dry substance like food. Generally, there are 2 types of solar dryers.
Direct solar dryer has a black absorbing surface which collects the light and converts it to heat and the substance get dried, that is placed directly on the surface. These driers have enclosure, glass cover and vents in order to increase the efficiency.
Indirect solar dryers, the black surface heat the incoming air rather than direct heating of substance to be dried. The heated air passed over the substance to be dried and exist upward from chimneys.