Green fan,

healthy life!

Call at +86-20-39134122

Leave a message admin@qixiangdoors.com

Blog
Home

Blog

Why do Qixiang HVLS FAN only have 5 blades instead of more?

Why do Qixiang HVLS FAN only have 5 blades instead of more?

  • 2020-09-08

Longer blades will create a wider column of air that is pushed downwards by an HVLS fan. Airflow research conducted by Ramadan Bassiouny and Nader S. Korah published in a 2011 issue of Energy and Buildings showed that the maximum amount of airflow comes from the midpoint of a fan. Airflow is lowest in the center of the fan and at the very edge of blade tips. This is why you don’t feel as much airflow when standing directly under a ceiling fan as you would if you were standing slightly to the side of its hub.


More blades might improve the velocity of air moving through the fan, but they don’t do anything to widen the column of air pushed out by the fan. Having more blades also increases the fan’s energy consumption.


1. The number of blades on a ceiling fan is important to its performance. While additional blades create more airflow fan weight and drag also increase, which requires the fan motor to work harder. Studies show that the airflow behavior improves by less than 10% when the number of blades exceeds four flat blades.



2. An odd number of blades has better aerodynamic balance, thus not easy to generate sympathetic viberation and then to minimize bearing friction and prolong service life to maintenance free. Using an even number of blades, the system is easy to get viberated and then blades or spindle become deformed and fractured.


According to the two theory above, after over three years of repeated experiments and contrasts, the final design of our Qixiang HVLS industrial fan blade numbers comes to 5 pieces. The odd number(5) blade design is more effective, safe and stable.


We are the first and the only one in China to apply the odd-number five blades for the optimal performance. More and more suppliers in China also adopt 5 blades are for the best performance of the high volume low speed (HVLS) fans. This have proved that we have been leading the development of the industry all the times!


© Copyright: Guangzhou Qixiang Industry Co., Ltd All Rights Reserved. 粤ICP备17038921号

top

Leave a message

Leave a message

    OEM,free installation instructions video,response service in one hour,design solutions for free,24-hours hotline consultation,Shipment within 7 days

  • Refresh the image