Design and Application of a Novel Dehumidifying System for a Fluidized Bed Dryer for the Drying of Canola Seeds

Narjes Malekjani, Seid Mahdi Jafari, Habibollah Mirzaee, Mohammad Hashem Rahmati


A novel fluidized bed dryer equipped with a dehumidifying system was designed and constructed. The dehumidifying system was based on refrigeration cycle and composed of an evaporator, a compressor, a condenser an expansion valve and a damper. The drying experiments were carried out in three temperature (35, 45 and 55°C) and three relative humidity (30, 50 and 70%) levels. The results showed that the relative humidity of drying air has a significant effect on drying rate. The drying rates decreased as relative humidity increased at a constant temperature, and increased as temperature increased at a constant relative humidity so dehumidifying can accelerate drying and decrease drying times.


fluidized bed dryer; dehumidifier; relative humidity; temperature

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Published by INSIGHT - Indonesian Society for Knowledge and Human Development