How do you measure fan power?
Take the number of amps and use the number 120 to multiply. The number 120 is used because it is the average amount of volts (electric pressure) that most appliances have. It is a simple equation. For example, if the amps are 0.6, multiply it by 120 – 0.6 x 120 = 72 fan watts.
What is the efficiency of a fan?
Fan efficiency is defined as the air power divided by the fan input power. Both Static and Total Efficiency can be calculated from fan performance data as follows: Where: CFM = Fan flow rate, ft3/min Ps = Static pressure, in. wg Pt = Total pressure, in.
How to calculate the horsepower of a fan?
The following is a generic equation to determine the required horsepower to drive the fan or blower element . This equation does not compensate for temperature, density or airflow charateristics of any particular fan or blower. Equation: P = (Q x p)/(229 x ) or. P = (Q x PF)/(33,000 x )
How to calculate the mechanical power of a motor?
The mechanical power output of the motor is simply the product of the motor speed and the torque load with a correction factor for units (if required). Therefore, the mechanical power output of the motor in this application is: output power = 0.2 oz-in x 8010 rpm x.00074 = 1.18 Watts
How is the efficiency of a fan determined?
Apart from the electrical and mechanical components, the efficiency of a fan is to a large extent dependent upon the shape and orientation of the blades. All fans of a given power rating will rotate at a speed commensurate with the air resistance, i.e. the lower the air resistance, the faster the rotation and the greater the flow.
What should be included in a fan calculator?
The fan calculator addresses only the blade angles. Mechanical/electrical efficiency must be dealt with by the designer when selecting suitable materials and drive systems. The head losses generated by the blade tip angles (inlet and outlet) define a fan’s ‘air’ efficiencies.