Temperature Variation of a Double-pass Solar Drying System with Porous Media

A solar drying system which consists of six solar collectors arranged in two banks of three collectors each in series and a drying chamber is investigated. The collector is a double-pass type with the second channel filled with porous media while the drying chamber consists of three levels of trays with the upper side covered with a transparent glass. The objective of this paper is to present the temperature variation of the system including the drying chamber temperature, glass temperature, absorber temperature and also the temperature of the first and second pass of the collector. Data of solar radiation is also shown to see the effect on the temperature variation of the drying system.