Explain about the Shade Drying?
Shade drying is carried out for products which can lose their colour and/or turn brown if put in direct sunlight. Products that have naturally vivid colours such as herbs, green and red sweet peppers, chilies, green beans and okra provide a more attractive end-product while they are dried in the shade. The principles for the shade drying are similar as of sun drying. The material to be dried needs full air circulation. Hence, shade drying is performed under a roof or thatch that has open sides; it CANNOT be done either inside conventional buildings along with side walls or in compounds sheltered from wind. Under dry circumstances when there is a good circulation of air, shade drying takes little more time than is generally needed for drying in full sunlight though, beside this there has been much research to develop simple systems that could be employed in developing countries and areas where acquiring other energy sources is limited. The very simple way of performing solar drying is to lay the material on the ground in the sun. Though this leaves the product open to the spoilage reactions described earlier. Simple structures, like the solar dryers, can be cheaply built which will improves the drying conditions.