Analisis Pengeringan Sawut Ubi Jalar (Ipomoea Batatas L.) Menggunakan Pengering Efek Rumah Kaca (ERK)

Sweet potatoes processing in to starch need a drying process. Green-house effect solar dryer – rotating rack type is one of the altenative for drying of sweet potatoes due to its higienis and its availability to be used anytime. The objective of the study was to analysis chopped sweet potatoes drying by using rotating rack greenhouse effect solar dryer. The capacity of the drying chamber is 48 kg of chopped sweet potatoes. Three experiments of drying have been conducted: the first drying is without products, the second is drying of products without rotating of rack and and the third is drying of products byimplement the rotating of rack of 45o every 60 minutes. The results of chopped sweet potatoes drying show that drying temperature on the dryer chamber ranged between 31.6oC to 61oC. Drying of product by implement the rotating of rack of 45o every 60 minutes yields the best temperature uniformity. To reduce moisture content from 72.76 %wb to 9.5 %wb it's needed 13.5 hours, or drying rate of 22.4 %bk/h. The energy consumption of the experiment 3 was 35.15 MJ/kg of moisture evaporated and the drying efficiency was 7.47