Axial flow fan and centrifugal fan in mechanical ventilation in an action, and you in the choice of when the first thing to understand their roles in what different ventilation, prevent you chose the wrong! Hoarding food barn ventilation, have a look of axial flow fan and centrifugal fan is how to give food ventilation.
One, due to the temperature and the grain temperature difference, the first time to be elected in the daytime ventilation, to reduce the grain temperature gap, reduce the occurrence of condensation. After the ventilation as far as possible in the evening, because the air is cooled at, night air humidity is relatively high, low temperature, so that reduce the water loss, but also make full use of the night temperature, improving the cooling effect.
Two, in the early days of centrifugal fan may appear to have doors and windows, wall condensation surface, even grain surface slight dew, as long as the ventilator stop, open the window, open axial flow fan, when necessary, turning the grain surface, the positions within the hot air can be excluded outside the barn. The axial flow fan is retarded ventilation wouldn't dewing phenomenon, will appear in the upper grain temperature rise slowly, with the ventilation of grain temperature will continue steady decline.
Slow ventilation three, axial flow fan, the axial flow fan air volume small, and food is a poor conductor of heat, ventilation early prone to individual parts of ventilation slowly, with ventilation to continue full grain storage temperature will gradually balance.
Four, slow food must pass through the ventilation vibration screen cleaning, and into the chamber of the food must be timely cleaning of the automatic grading impurity region caused, otherwise easily lead to uneven local ventilation. The ventilation characteristics of axial flow fan: good cooling effect; low specific energy consumption, particularly important in advocating energy conservation today; ventilation time and easy to master, not easy to appear the dew; no single equipped with fan, convenient and flexible. Disadvantages: because the volume is small, the ventilation time is long; the precipitation effect was not obvious, high moisture grain used for axial fan for ventilation.
The ventilation characteristics of centrifugal fan: temperature, precipitation has obvious effect, ventilation time is short; disadvantages: high unit energy consumption; ventilation timing not easy dewing. Summary: in the ventilation cooling purposes in the application of axial flow fan, safe, efficient, energy saving and slow speed ventilation; application of centrifugal fan in precipitation for the purpose of ventilation.