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

As we all know, wind pressure is one of the important performance indicators of large fans. The fan wind pressure mainly depends on the shape, area, height and speed of the fan blades. With large fans, stroke levels change with pressure.

Wind pressure is due to building blocks, so that the surrounding air is blocked, dynamic pressure drops, static pressure rises. The local eddy pressure drop generated on the side and back compared to the distance of the airflow disturbance, this increase and decrease in static pressure is called wind pressure. Fan pressure is the pressure that a large fan can make between the air outlet and the inlet, the unit is generally mm (cm) water column, that is, millimeters (cm) of water column (similar to measuring atmospheric pressure in millimeters of mercury, but because of the smaller pressure difference, generally in the water column unit) MMH2O mma.

In order to carry out normal ventilation and overcome the resistance of the fan's ventilation stroke, the fan must produce pressure to overcome the air supply resistance, and the measured pressure change value is called hydrostatic pressure, that is, the difference pressure between the static pressure and atmospheric pressure. It is the pressure of the gas acting on the surface of an object, and the water pressure is measured by the hole perpendicular to its surface. Converting the kinetic energy required for gas flow into the form of pressure is called dynamic pressure. Wind pressure is an important measure of the "strength" of a large fan, and if the wind is compared to the swing force of a weapon, the pressure is the sharpness of the weapon.

The wind pressure mainly depends on the shape, area, height and speed of the fan, the first three effects are more complex, the speed relationship is simple and direct - the faster the speed, the greater the pressure of the large fan. The air pressure of the large fan directly affects the air supply distance of the fan. The fan outlet to the bottom of the radiator seems to be only a few centimeters, but due to the complexity and density of the heat sink, making the air flow effectively cover 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 air pressure shown in industrial fan products are values under ideal conditions, that is, there is no pressure difference between the inlet and outlet of the large fan between the air capacity (air capacity), and the fan to the closed air chamber hair until the air capacity is the zero state of the difference between the air chamber and the external pressure (hydrostatic pressure). They are not two isolated performance indicators, but the relationship between the two is limited, the relationship between flow rate and pressure in fluid mechanics - the amount of air decreases with the pressure difference (especially the radiator wind resistance), the extent of the two constraints depends on the shape of the fan blade and the design of the overall structure.

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

When choosing industrial large fans, naturally pay special attention. If the design of the film fin + air duct radiator generally does not require too much air pressure, it can ensure smooth airflow and achieve the desired effect; If a typical parallel fin + top blown radiator is then selected according to the density and height of the fins, shape and length of the wind trough between the fins, there is sufficient wind pressure for the fan. If a fin with a dense columnar fin, such as the alpha or Swiftech, is designed with a top blow wing, a large fan requires greater wind pressure.