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The role of axial flow fans and centrifugal fans in mechanical ventilation
2024-11-26
1. Due to the significant difference between air temperature and grain temperature, the first ventilation time should be chosen during the day to reduce the temperature difference and lessen the occurrence of condensation. Subsequent ventilation should preferably be done at night, as this ventilation primarily aims to lower the temperature. The atmospheric humidity is relatively high and the temperature is lower at night, which reduces moisture loss and fully utilizes the low temperature at night to enhance the cooling effect.
2. During the initial ventilation with a centrifugal fan, condensation may occur on doors, windows, and walls, and even slight condensation on the surface of the grain. As long as the fan is stopped, windows are opened, and an axial flow fan is turned on, and if necessary, the grain surface is turned over to expel the humid air from the warehouse, it can be resolved. However, using an axial flow fan for slow ventilation will not cause condensation; only a slow rise in the temperature of the upper grain layer will occur, and as ventilation continues, the grain temperature will gradually decrease.
3. When using an axial flow fan for slow ventilation, due to the small airflow of the axial flow fan and the fact that grain is a poor conductor of heat, individual areas may experience slow ventilation at the beginning. However, as ventilation continues, the temperature of the entire warehouse will gradually balance.
4. The grain undergoing slow ventilation must be cleaned through a vibrating screen, and the grain entering the warehouse must be promptly cleared of impurities caused by automatic grading; otherwise, it may lead to uneven ventilation in certain areas.
5. Energy consumption calculation: Warehouse 14 used an axial flow fan for a total of 50 days, averaging 15 hours per day, totaling 750 hours. The average moisture content decreased by 0.4%, and the average grain temperature decreased by 23.1 degrees, with a unit energy consumption of: 0.027 kW.h/t.℃. Warehouse 28 was ventilated for a total of 6 days, totaling 126 hours, with an average moisture decrease of 1.0% and an average temperature decrease of 20.3 degrees, with a unit energy consumption of: 0.038 kW.h/t.℃.
6. Advantages of using an axial flow fan for slow ventilation: good cooling effect; low unit energy consumption, which is particularly important in today's energy-saving advocacy; easy to grasp the timing of ventilation, with less chance of condensation; no need for separate fan equipment, making it convenient and flexible. Disadvantages: due to the small airflow, the ventilation time is long; the dewatering effect is not obvious, and high moisture grain is not suitable for ventilation with an axial flow fan.
7. Advantages of centrifugal fans: significant cooling and dewatering effects, short ventilation time; disadvantages: high unit energy consumption; poor timing control can easily lead to condensation.
8. Conclusion: For ventilation aimed at cooling, using an axial flow fan for safe, efficient, and energy-saving slow ventilation is recommended; for ventilation aimed at dewatering, a centrifugal fan should be used.
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