The relationship between fan speed and air volume

Food Waste Disposer
2020-08-22
The difference between wall mounted hrv and air conditioner
2020-08-25

The relationship between fan speed and air volume

The relationship and calculation of fan air volume and pressure speed n: speed N: power P: pressure Q: flow

Q1/Q2=n1/n2 P1/P2=(n1/n2)²
N1/N2=(n1/n2) cubic fan air volume and total pressure calculation method

Power (W) = air volume (L/S) * wind pressure (Kpa) / efficiency (75%) / force rate (75%)

Total pressure = static pressure + dynamic pressure. Fan motor power (W) = fan power (W) * 130% = air volume (L/S) * wind pressure (Kpa) / efficiency (75%) / force rate (75%) * 130%

Fans are divided into: static pressure, dynamic pressure, full pressure

The so-called static pressure refers to the pressure exerted by the gas on the surface of an object parallel to the airflow. In layman’s terms: static pressure-refers to the pressure that overcomes the resistance of the pipeline.

The definition of dynamic pressure refers to the conversion of the kinetic energy required in gas flow into pressure. In layman’s terms: Dynamic pressure-is the pressure that drives the gas to move forward.

Total pressure = static pressure + dynamic pressure

The total pressure is the difference between the total outlet pressure and the total inlet pressure.

Static pressure is the total pressure of the fan minus the dynamic pressure 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 square P = P dynamic + P static, two models of the same model and equal speed After the fans are connected in parallel, the maximum air volume is about 90% of the air volume of the two fans, and the air pressure is equal to the pressure of a single fan.

Want to know more, follow vtronic