Question

: Direct Solar Drying (Natural convection type)[1]

Answer 1

ny countries, agricultural products are dried under the open sun. However, this way of drying degrades the quality of the dried products due to interference from external impurities and uneven drying rates. Numerous types of solar dryers have been designed and developed in various parts of the world, yielding varying degrees of technical performance. Basically, there are three types of solar dryers; direct solar dryers, indirect solar dryers and mixed-mode dryers. This review paper is focused on the natural convection direct type solar dryers. These are the most cost effective type of solar dryers and are easy to fabricate and use. Direct type natural convection solar dryers do not use any auxiliary equipment and protects the products from external contamination. In this review paper, we reviewed different types of direct natural convection solar dryers and different design modifications applied to them in order to increase their effectiveness