Drying is the oldest preservation technique of agricultural products and it is an energy intensive process. It is an essential process used all over the world for the preservation of farm produce. It helps in reducing the water activity of the produce to a level below which deterioration does not occur for a definite duration [7]. High prices and shortages of fossil fuels have increased the emphasis on using alternative renewable energy resources [8]. The two oil crises of the early and late 1970s prompted research and development work to have solar dryers to save on energy [9]. Drying of agricultural products using renewable energy such as solar energy is environmental friendly and has less environmental impact. Sun drying is still widely used in many tropical and subtropical countries as it is the cheapest method, but the quality of the dried products is far below the desired standards. The principle of solar crop drying dates back to the advent of