Solar drying is the oldest way for the preservation of crops and it is practiced everywhere [1]. In natural drying or open sun drying, the crops are put on compact earthen floor, mat, concrete, floor, and road in the full sunny days. It is exposed to various contaminations—dirt, pest infestation, and loss by birds and beast. In addition, there is the possibility of aflatoxin contamination of crops like maize. Fig. 1 illustrates the drying of paddy on concrete floor. Open sun drying is also used to dry the marine products.