In addition to current, voltage and power, the most important parameters of the cross-flow fan are speed, air volume, wind pressure and noise.
1. Speed (unit: RPM-speed per minute; RPS-speed per second)
For the same fan, the higher the speed, the greater the air volume, the greater the power, the higher the wind pressure, and the corresponding noise will also increase.
2. Air volume (unit: m3 / min and CFM; 1CFM = 0.0283 m3 / min)
The cross-flow fan relies on its air volume to complete the ventilation process, so in many cases we need to consider the size of the fan air volume. In general, the air volume of the fan is proportional to the speed during operation. The greater the speed of the fan, the greater the air volume of the fan.
3. Wind pressure (unit: mmAq or Pa; 1 mmAq = 9.8Pa)
The wind blow of the fan involves several concepts of static pressure, dynamic pressure and full pressure. The definition of so-called static pressure is: the pressure of the gas acting on the surface of the object parallel to the airflow. In general speaking, static pressure refers to the pressure of the resistance of the pipeline. The definition of dynamic pressure is to convert the kinetic energy required in the gas flow into a form of pressure. In layman's terms: dynamic pressure is the pressure that moves the gas forward; full pressure = static pressure + dynamic pressure, and full pressure is the difference between the total outlet pressure and the total inlet pressure.
Static pressure is the full pressure deceleration of the fan to remove the dynamic pressure (resistance along the way) at the outlet of the fan. The dynamic pressure is the resistance generated by the air when it flows. P dynamic = 0.5 × density × wind speed squared; P = P dynamic + P static
The change in wind pressure is proportional to the square of the speed ratio.
4. Noise (Unit: dBA)
Generally speaking, when the fan structure is determined, the higher the speed, the greater the fan noise
