Blower Fan Efficiency

M f fan efficiency values between 0 1 dp total pressure pa q air volume delivered by the fan m 3 s p power used by the fan w nms the power used by the fan can be expressed as.

Dyson fan manual. The fan efficiency is the ratio between power transferred to airflow and the power used by the fan. Apart from these two the tornado 24 wide version air circulator fan is ideal for professional use and the xpower p 230at mini mighty air mover utility blower fan is the best budget buy. The lasko u12104 high velocity pro pivoting utility fan is the best overall while the max storm 12 hp dryer blower floor fan is the most versatile option.

Propeller fans usually run at low speeds and moderate temperatures. Fans have a specific ratio of up to 111 blowers from 111 to 120 and compressors have more than 120. For example if you have an industrial fan that can achieve 80 static efficiency and youre trying to move 20000 cfm through 10 inches wg of resistance a 40 horsepower motor would get the job done.

This means a blower that is moving 1000 cfm cannot use more than 580 watts of power to do so. Fans and blowers bureau of energy efficiency pressures upto 500 mmwc. They experience a large change in airflow with small changes in static pressure.

Per the american society of mechanical engineers asme the specific ratio the ratio of the discharge pressure over the suction pressure is used for defining fans blowers and compressors. The fan efficiency is in general independent of the air density and can be expressed as. Fan blower efficacy is called out in various codes and standards such as california energy commissions requirement that all blowers perform at or below a 058 fan efficacy.

Why fan static efficiency matters. You can use the maximum static efficiency to determine the horsepower you need in your application.