Understanding the difference between centrifugal fans and axial fans is essential for proper usage and optimal resource utilization. When it comes to grain storage and ventilation, temperature control plays a crucial role in preventing condensation and maintaining quality.
One key consideration is that during the initial phase of ventilation, the temperature difference between the ambient air and the grain can be significant. Therefore, it's advisable to start ventilation during the day. This helps reduce the temperature gap and minimizes the risk of condensation. On the other hand, nighttime ventilation is more effective for cooling purposes, as the air is cooler and more humid, which helps reduce moisture loss and enhances the cooling effect.
In the early stages of using a centrifugal fan, condensation may occur on doors, windows, and walls, and even on the surface of the grain. In such cases, it's recommended to stop the fan, open the windows, and use an axial fan if necessary. Turning the grain surface can also help remove hot and humid air from the warehouse. Unlike centrifugal fans, axial fans used for slow ventilation typically do not cause condensation. Instead, only the upper and middle layers of the grain may experience a gradual temperature increase before eventually cooling down steadily.
When using an axial flow fan for slow ventilation, the airflow is relatively low, and since grains are poor conductors of heat, the initial stages may show uneven temperature distribution. However, as ventilation continues, the temperature will gradually balance out.
It's important to clean the grain thoroughly using a vibrating screen before storing it. Any impurities that accumulate due to natural sorting must be removed promptly, as they can lead to uneven ventilation and affect the overall efficiency.
Energy consumption data shows that in Warehouse No. 14, the axial fan was used for 50 days with an average of 15 hours per day, totaling 750 hours. The moisture content decreased by 0.4% on average, and the grain temperature dropped by 23.1°C. The unit energy consumption was 0.027 kWh/t.°C. In Warehouse No. 28, the fan ran for 6 days, totaling 126 hours, reducing moisture by 1.0% and lowering the temperature by 20.3°C, with a unit energy consumption of 0.038 kWh/t.°C.
Axial fans offer several advantages for slow ventilation, including better cooling performance, lower energy consumption per unit, and easier control of ventilation timing without causing condensation. They also eliminate the need for separate fans, making them convenient and flexible. However, their smaller air volume means longer ventilation times, and they are not ideal for high-moisture grains.
Centrifugal fans, on the other hand, are more effective for both cooling and drying, with faster results. However, they consume more energy and require more precise timing to avoid issues like condensation.
In conclusion, when the goal is to cool grain safely and efficiently, axial fans are the preferred choice for slow, energy-saving ventilation. Centrifugal fans, on the other hand, are more suitable for situations where rapid drying is needed.
Source: Zhejiang Juli Fan Co., Ltd.
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