As is well known, wind pressure is one of the important performance indicators for large fans. The wind pressure of the fan blades mainly depends on the shape, area, height, and speed of the fan blades. Compared to large fans, the level of stroke varies with changes in pressure.

Wind pressure is caused by building blocks, which obstruct the surrounding air, leading to a decrease in dynamic pressure and an increase in static pressure. The increase and decrease in static pressure caused by local vortex pressure drop on the side and back, compared to the distance of airflow disturbance, is called wind pressure. Fan pressure is the pressure that a large fan can apply between the air outlet and inlet, typically measured in millimeters (cm) of water, or millimeters (cm) of water (similar to measuring atmospheric pressure in millimeters of mercury, but generally in water column units due to the small pressure difference) MMH2O mma.

In order to carry out normal ventilation and overcome the resistance of the fan's ventilation stroke, the fan needs to generate pressure to overcome the supply resistance of air. The measured pressure change value is called static water pressure, which is the difference between static pressure and atmospheric pressure. It is the pressure exerted by gas on the surface of an object, and the water pressure is measured by holes perpendicular to its surface. The conversion of kinetic energy required for gas flow into pressure form is called dynamic pressure. Wind pressure is an important measure of the strength of large fans. If wind is compared to the swinging force of a weapon, then pressure is the sharpness of the weapon.

The wind pressure mainly depends on the shape, area, height, and speed of the fan, with the first three having a more complex impact. The relationship between speed is simple and direct - the faster the speed, the greater the pressure on a large fan. The wind pressure of a large fan directly affects the supply distance of the fan. The outlet of the fan to the bottom of the radiator seems to be only a few centimeters, but due to the complexity and density of the heat dissipation fins, the effective airflow covering the radiator is not as simple as imagined. Although the design process of the radiator will try to avoid excessive wind resistance, in order to ensure sufficient heat dissipation area, the requirement of wind pressure is inevitable.

The air volume and pressure shown in industrial fan products are ideal values under ideal conditions, that is, there is no pressure difference between the inlet and outlet of large fans between air capacity (air capacity), and the fan heads into a closed air chamber until the air capacity is the zero state (hydrostatic pressure) between the air chamber and external pressure. They are not two isolated performance indicators, but the relationship between the two is limited. In fluid mechanics, the relationship between flow velocity and pressure - the airflow decreases with pressure difference (especially the radiator drag), and the degree of these two constraints depends on the shape of the fan blades and the design of the overall structure.

What is the importance of wind pressure on large industrial ceiling fans?

When choosing industrial large fans, it is natural to pay special attention. If the design of thin film fins and air duct radiators generally does not require too much air pressure, it can ensure smooth airflow and achieve the expected effect; If a typical parallel fin+top blowing radiator is used, then a fan with sufficient wind pressure is selected based on the density and height of the fins, shape, and length of the fins between the air ducts. If fins with dense columnar fins, such as α Or Swiftech, designed with top blown wings, large fans require higher wind pressure.