Simulasi Computational Fluid Dynamic (CFD) Rumah Pengering Kopi Menggunakan Plastik UltraViolet (UV) Solar Dryer

Yoseph P. Ndeo, Verdy A. Koehuan, Wenseslaus Bunganaen

Abstrak

Drying of agricultural products, especially coffee beans, is the removal of water from an agricultural product until a moisture content is reached in balance with environmental air or until a moisture content level where fungi, insects and destructive enzymes can no longer be active. Utilization of solar energy using ultra violet (UV) plastic is also an alternative to overcome the constraints of drying with direct sunlight which is common in society, such as low capacity and requires a long time. By using computational fluid dynamics (CFD) simulations in this study to determine the temperature distribution and flow velocity in the coffee dryer house. From the results of CFD simulations and experiments with flow rates of 0.1 m / s, 0.5 m / s and 1.36 m / s, both without load and with drying load, there are differences in temperature where at speeds of 0.1 m / s and 0 , 5 m / s the mean temperature of the CFD simulation results with the turbulent flow model is lower than the experimental results, while at a speed of 1.36 m / s it is relatively close to the experimental results. From the results of the analysis of the air temperature distribution in the drying house shows that at a constant flow rate for different simulation times, the temperature distribution tends to be uniform. Meanwhile, at 11:00 and 13:00 with low speed shows an increase in temperature at the inlet (north of the dryer house), but at 15:00 there is an increase in temperature at the exit of the dryer house (south of the dryer house).