Conversion between air volume, wind pressure and power

 Nonetheless, we can comprehend the interrelations among these parameters based on fundamental principles and simplified formulas. These relationships are essential for estimating the installed power of a Fan when air volume and pressure are known or for predicting operational air volume once the fan has been commissioned, given known wind pressure and power. Air volume refers to the volume of air passing through the fan per unit time during operation. If wind speed can be accurately measured using an anemometer on-site, the air volume can be calculated using the formula:

Q = V * S,

where Q represents air volume (m³/h), V is wind speed (m/s), and S is the cross-sectional area of the duct (m²). Fan power denotes the energy transferred to the gas by the fan per unit time, also known as the effective power of the fan, denoted as N. The calculation of fan power (N) typically involves air volume (Q), wind pressure (P), and the efficiency of fan and mechanical power transfer (η), using the simplified formula:

N = K * Q * P / (3600 * η1 * η2 * 1000),

where N is the actual power (kW), Q is air volume (m³/h), P is air pressure (Pa),

η1 is fan efficiency, η2 is mechanical transmission efficiency, and K is the motor capacity factor. It is important to note that for wind pressure (P), the pressure value near the inlet of the fan should be used as the basis for calculations to ensure more accurate results.