The Principal applications of solar air dryer or heater are, for drying agriculture and industrial products and for space heating. Drying is simply the process of moisture removal from a product. Solar heated air could be used more effectively for drying of the various products under controlled conditions. In industry solar drying system is rarely used. In this book solar air dryer, in which regenerative desiccant material is used, to extract heat from product during off sun shine hours. For additional benefits dryer is made up of forced convection type. This type of active solar air dryer...