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The principle of ventilation and cooling of large industrial fans

Update:05-06-2020
Summary:

Energy-saving industrial fans with a diameter of more t […]

Energy-saving industrial fans with a diameter of more than 7 meters, each wind effectively covers an area of 2,000 square meters, and consumes 1.5 kilowatt hours of electricity per hour. The energy-saving effect is outstanding. It is suitable for large spaces such as logistics warehouses, workshops and garages. It is called an industrial fan. .

Large industrial ceiling fans operate under ideal conditions. You can think of the wind blown by a super large industrial fan as a columnar airflow. The outer surface of the columnar airflow will cause friction with the air. The resistance = K1 (resistance constant) * perimeter ventilation Quantity = k2 (speed constant) * cross-sectional area. Compare a fan with a diameter of 730mm and a super large industrial fan with a diameter of 7300mm:

1. Fan with a diameter of 730mm: circumference = 0.73 × 3.14 = 2.29m cross-sectional area = 0.36 × 0.36 × 3.14 = 0.407 square meters

2. Fan with a diameter of 7200mm: perimeter = 7.2 × 3.14 = 22.9m cross-sectional area = 3.6 × 3.6 × 3.14 = 40.7 square meters

It can be seen that the resistance of the large fan passing through the same area of ??airflow is 0.1 times that of the small fan

Principle: The friction force of the large airflow fluid movement is relatively small, so that the large fan can drive a large amount of air but the energy required by the small fan is relatively less! Once the inertia of the air is overcome, the large amount of air flow has its own kinetic energy Only a small follow-up power is needed to maintain the continuous flow of air. The airflow friction of the small fan is relatively large, and most of the energy is lost in the friction process.

 

More info:  Taizhou Beierde Electromechanical Technology Co., Ltd.

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