Nghiên cứu thực nghiệm sấy tiêu bằng máy sấy năng lượng mặt trời

Abstract

Aprototype of peppercorn solar assisted dryer with capacity of 5kg per batch was designed and fabricated. Experimental results showed that drying time decreases with an increase of drying-air velocity. In addition, it increases with the layer thickness of drying material. The drying time was from 7-9 hours when the pepper was dried from the moisture content of 64 ± 1% (wet basis) to 13 ± 1% (wet basis) at the drying temperature of 600C, the drying-air velocity is from 1.0 to 1.5 m/s and the layer thickness of drying material is in range of 13 to 40 mm. Pepper products are black, wrinkled skin, characteristic strong smell and ensure food hygiene and safety. The product was not contaminated with Escherichia coli.