Fan power refers to the amount of energy required for a fan to operate and move air, while efficiency refers to how well the fan converts that energy into air movement.
Calculating fan power and efficiency can help determine the operating costs and performance of a fan, and can also aid in selecting the right fan for a specific application.
The data needed to calculate fan power and efficiency includes the air flow rate, air pressure, fan speed, and motor power. This data can typically be found on the fan's performance curve or can be measured using specialized equipment.
Fan power can be calculated using the following formula: P = (Q x ΔP) / η, where P is fan power (in watts), Q is air flow rate (in cubic feet per minute), ΔP is air pressure (in inches of water), and η is fan efficiency (expressed as a decimal). Efficiency can be calculated by dividing the fan's actual power consumption by its theoretical power consumption.
The type and design of the fan, as well as the operating conditions, can affect fan power and efficiency. For example, dirty fan blades or ductwork, incorrect fan speed, and changes in air density can all impact the fan's performance and efficiency.