Ceiling Fan Blade Pitch Efficiency

In this case the average ceiling fan efficiency is 5 500 cfm 70 w or about 79 cfm per w.

Ceiling fan blade pitch efficiency.

It used to be the case that a five or six blade ceiling fan would translate into more efficiency as opposed to a three blade or four blade but that s no longer the case. The blade size shape design number and material all play a large part in the final cfm rating and quality. Blade pitch blade shape and size rpm height from ceiling and motor size. Each fixture has its own standard referring to the size shape and pitch for maximum efficiency and air movement.

A cfm of 75 is the minimum number to make a fan efficient. You could have a fan that moves a lot of air with a high cfm but does so at a high wattage. The four areas that determine airflow are blade shape blade pitch distance from ceiling and motor quality. Ceiling fan blade pitch usually holds in the range between 11 and 16.

Dividing the airflow generation by the power consumption gives the ceiling fan s efficiency. It is commonly stated that the steeper the blade pitch the more air a fan will move or a good fan will have a blade pitch of 14 degrees or more. These common misnomers are often used to entice people to purchase a ceiling fan regardless of how well it actually performs. Five factors work together to determine the airflow and efficiency of a ceiling fan.

See what gives a fan power airflow efficiency and why. Airflow efficiency is the cfm divided by the watts amount of energy used to run the fan at its highest speed. Since the cfm is the measure for a fan s airflow efficiency the number of blades is more related to embellishing the style for your space. So the fan may not be considered efficient.

This angle or pitch is measured in degrees. In addition to the amount of blades the efficiency of a ceiling fan also depends on the blade pitch the balance of the blades and the motor. Fewer blades mean less drag. Blade pitch is extremely important because it determines how much air the fan can circulate and the ideal blade pitch for a ceiling fan is 14 degrees or above.

They represent the year s very best for energy savings and environmental protection. Overall you re probably not going to see any significant differences in operational performance between ceiling fans with three or five blades. On average a ceiling fan has an airflow generation of about 5 500 cfm and consumes 70 w. Products that make the energy star most efficient list for 2020 deliver cutting edge energy efficiency along with the latest in technological innovation.

By paying attention to the ways in which these factors affect one another you can buy a ceiling fan that fits your needs and has long lasting durability without noise or wobble.