A Study on Paddy Drying with an Automated Fluidized Bed Dryer

Autchara Junphong, Ninlawan Chaitanoo, Apidet Sangsamoot, Natthamon Thamon, Thongchai Tanasombat, Penwarat Panphattharachai, Atchara Chaiya

Abstract


This study presents the development and performance evaluation of an automated fluidized bed dryer for paddy, equipped with a microcontroller-based system (Arduino) for precise control of temperature and humidity. The dryer, with dimensions of 47 cm× 72 cm × 190 cm, was fitted with sensors at the inlet, middle, and outlet of the grain column. Drying experiments were conducted at temperatures of 40, 50, and 60°C for 60, 90, and 120 minutes, using 1,500 grams of paddy with an initial moisture content ranging from 14% to 15%w.b. The optimal air velocity for fluidization was found to be 9.67 m/s, ensuring stable grain suspension and improved heat and mass transfer. The condition of 60°C for 120 minutes yielded the highest moisture reduction of 70.62% (final moisture content 4.22% w.b.) with moderate energy use (SEC = 27.37 MJ/kg). This condition demonstrated a well-balanced trade-off between drying efficiency and energy consumption, making it suitable for real-world applications in medium-scale farms or small-scale agro-industrial facilities where both product quality and energy performance are critical, while also contributing to global efforts in sustainable energy use.

Keywords


Fluidize Bed; Moisture; Paddy Drying; Arduino; SDG7

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DOI: https://doi.org/10.64289/iej.25.03A11.7634243