The energy saving of the longan dryer with desiccant trays are also compared its performance with the conventional dryer. As shown in figure 20, the developed dryer has higher efficiency or more energy saving than that of original one. Moreover, it is also found that the energy saving increases with the number of tray. It should be noted that, this result calculates from the assumption of replaceable time for new desiccant tray every 3 hrs and the used tray is regenerated by external heat source.