Relationship between fan speed and current, air volume, and pressure

Thread Content

Variations in fan speed are related to changes in current, air volume, and pressure, but not to efficiency. As the fan speed increases, the air volume increases by a factor of one ； As the fan speed increases, the wind pressure increases by a factor of two squared ； As the fan speed increases, the current increases by a factor of three ； As the fan speed increases, the efficiency value remains unchanged. For example: if the original speed is 1000 RPM, with an air volume of 60,000 m3/h, an air pressure of 2500 Pa, a current of 120 amps, and an efficiency of 75%, then if the speed increases from 1000 RPM to 1200 RPM – that is, by a factor of 1.2 – the air volume will become 60,000 m3/h * 1.2 = 72,000 m3/h. The air pressure will be 2500 Pa * 1.2 * 1.2 = 3600 Pa. The current will be 120 A * 1.2 * 1.2 * 1.2 = 207 A. The efficiency of the fan remains unchanged.