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The Role of Axial Fan and Centrifugal Fan in Mechanical Ventilation

1. Due to the large difference between temperature and grain temperature, the first ventilation time should be in the daytime to reduce the difference between grain temperature and temperature and reduce the occurrence of condensation. In the future, ventilation should be carried out at night as far as possible, because this ventilation is mainly based on cooling, and the atmospheric humidity is relatively high and the temperature is low at night, which not only reduces water loss, but also makes full use of the low temperature at night and improves the cooling effect.

2. At the initial stage of ventilation with centrifugal fan, condensation on doors, windows and walls may occur, or even slight condensation on surface grain surface. Just stop the fan, open the window, open the axial flow fan, turn the grain surface when necessary, and remove the hot and humid air from the bin. However, if the axial flow fan is used for slow-speed ventilation, condensation will not occur, but the grain temperature in the middle and upper layers will rise slowly, and the grain temperature will drop steadily as the ventilation continues.

3. When the axial flow fan is used for slow ventilation, due to the small air volume of the axial flow fan and the poor conductor of heat, the slow ventilation of individual parts is easy to occur at the initial stage of ventilation. As the ventilation continues, the whole warehouse grain temperature will gradually balance.

4. The grain for slow ventilation must be cleaned by vibrating screen, and the grain entering the warehouse must be cleaned in time to the impurity area caused by automatic grading, otherwise it is easy to cause local uneven ventilation.

5. Advantages of slow-speed ventilation with axial flow fan: good cooling effect; Low unit energy consumption is especially important in advocating energy conservation today. Ventilation timing is easy to master and condensation is not easy to occur. No separate fan is required, which is convenient and flexible. Disadvantages: Due to the small air volume, the ventilation time is long; the precipitation effect is not obvious, and the high moisture grain should not be ventilated by axial flow fan.

6. The advantages of centrifugal fan: obvious cooling and precipitation effects, short ventilation time; Disadvantages: high unit energy consumption; Dew is easy to occur if the ventilation timing is not well controlled.

7. Conclusion: Axial flow fan is used for safe, efficient and energy-saving slow speed ventilation in ventilation for cooling purpose. Centrifugal fan is used for ventilation for precipitation purpose.

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