# How do you calculate the power output of a fan?

## How do you calculate the power output of a fan?

Divide the fan’s power consumption, measured in kilowatts, by 0.746 to convert it to horsepower. If, for instance, a fan consumes 4 kW: 4 / 0.746 = 5.36 horsepower. Multiply the result by the fan’s efficiency. If the fan operates, for instance, at 80 percent efficiency: 5.36 x 0.80 = 4.29 horsepower.

How is SFP calculated?

SFP = P network/ qV max The SFP value is power divided by air flow: (SFP) = kW/m3/s What is the SFPv- value? This is the specific power requirement for one fan, or one machine used by the Swedish Ventilation Association (Föreningen V), calculated in the same way as in the SFP value. Note!

How do you calculate CFM from fan power?

The full load energy rate for fans in the ASHRAE Standard 90.1 is calculated in the following manner: For Systems 1 and 2 and the supply fans for 9 and 10, the value is calculated using the Pfan = CFM × 0.3 equation where CFM is the baseline design airflow for the given fan.

### What determines the power of a fan?

To determine power usage of a specific fan simply divide the amount of air moved by the fan (i.e. cfm @0.10″) by the energy efficiency rating (i.e. cfm/[email protected]″) of the fan.

What is the power of small fan?

Fans range in size from 36 inches to 56 inches using 55 to 100 watts, a typical 48 inch ceiling fan will use 75 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 much power does a fan consume?

65 to 80 Watt Ceiling FansMost of the ceiling fans in India consume around 70-80 watts. As energy efficient ceiling costs more, people prefer cheap fans even though they consume more of energy….Power Consumption of a Ceiling Fan.

Speed Atomberg Ceiling Fans Ordinary Ceiling Fan
Speed 3 14 Watts 45 Watts
Speed 4 19 Watts 55 Watts
Speed 5 28 Watts 75 Watts

Is slow fan consumes less electricity?

No, the fan consumes the same amount of current operated at different speeds. As when you control the speed of your fan you are actually controlling the voltage drop. This voltage drop actually generates heat inside the regulator, which does not affect the current flow or the current consumption at all.

Does a fan take a lot of electricity?

Do Fans Use a Lot of Electricity? Running a fan takes a lot less electricity than running an air conditioner; ceiling fans average at about 15-90 watts of energy used, and tower fans use about 100 watts.