The study deals with the energy and exergy analyses of the drying process of corn dryer. Corn with average initial moisture content of 24% dry base (d.b) were dried until they reached a final moisture content of 15% (d.b) at temperatures of 103 °C in 60 min. The drying experiments were conducted at two different drying air velocity 2.8 m s-1 and 3.5 m s-1. The effective diffusion coefficient (Deff) was determined by means of an analytical solution of Fick’s second law. Deff values increased with air velocity increases, respectively 5.6581 × 10-8 and 1.002 × 10-7 m2 s-1. It was found that effective moisture diffusivity value increased with an increased in air velocity. Energy and exergy analyzes were carried out and results showed that both energy utilization and energy utilization ratio increased with increasing air velocity. For 3.5 m s-1 velocity of the drying air, EUR varied between 39-98% in the drying chamber. The specific energy consumption (SEC) for the 2.8 m s-1 is in the range of 0.60-0.15 kWh kg-1, for the 3.5 m s-1 of 1.0 to 0.14 kWh kg-1. The analysis shows maximum exergy efficiency was observed in air velocity 3.5 m s-1 in 55 min (60.0%) while the minimum exergy efficiency was obtained in air velocity 2.8 m s-1 in 60 min (41.0%).

中文翻译：

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玉米干燥过程的火用和能量分析：实验室规模干燥机的实验研究

该研究涉及玉米干燥机干燥过程的能量和火用分析。将平均初始水分含量为24％干基（db）的玉米干燥，直到60分钟内在103°C的温度下最终水分含量为15％（db）。干燥实验以两种不同的干燥空气速度2.8 m s-1和3.5 m s-1进行。有效扩散系数（Deff）是通过菲克第二定律的解析解确定的。随着空气速度的增加，Deff值分别增加5.6581×10-8和1.002×10-7 m2 s-1。发现有效的水分扩散率值随着空气速度的增加而增加。进行了能量和火用分析，结果表明，能量利用率和能量利用率均随风速的增加而增加。对于3。5 m s-1干燥空气的速度，EUR在干燥室中的变化范围为39-98％。2.8 m s-1的比能耗（SEC）在0.60-0.15 kWh kg-1的范围内，而3.5 m s-1的比能耗在1.0到0.14 kWh kg-1的范围内。分析显示，在55分钟的风速3.5 m s-1中观察到最大的火用效率（60.0％），而在60分钟的风速2.8 m s-1中观察到最小的火用效率。