Açıklama:
The temperature controlled indirect solar dryeris designed in Quetta by using simple available stuffs in the market to dry theagricultural products for its longer shelf life. The dryer consists of dryingcabinet, solar cell, electrical fan and collector. Inside the cabinet there arefour trays at equally distance from each other, each tray receive uniformlyheated air from the collector to dry the agricultural product. During thedrying process temperature and relative humidity inside the cabinet is measuredwith help of digital hygrometer. Tomatoes, mint leaves, eggplant and onion weredried in newly low cost designed dryer. The drying time, color and quality ofthese products are compared with open sun drying. The result shows that theproduct dried in the newly dryer is good in quality and dry faster than opensun drying method. The drying occurs in falling rate period. Uniformity of thedryer in each tray was also checked by placing vegitable slices of same sizeand weight in each tray, the drying time for each tray was same. By increasingthe size of vegitable slices increase the drying time, result also shows thatincreasing in drying air temperature also increase the drying time.