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Use Fan Laws to Size Fan

Visit https://airprofan.com/ - Call 715-365-3267 - Email fans@airprofan.com If you want to avoid speed traps, follow the three fan laws and make sure to set your sights on the horizon and not just what’s on the road in front of you. AirPro Sales Manager and Senior Application Engineer Chet White shares formulas for the three fan laws and how to use them in calculating fan size based on speed changes in this 3-minute video. Full Transcript: There are three fan laws that we use when considering what’s going to change in the operation of your fan when you speed up or slow down the operation speed. The first law is that your volume is going to change proportional to your speed change. So V-two over V-one equals speed-two over speed-one. The second law is that your pressure is actually going to change proportionally with the square of the speed change. The third law is that our horsepower is going to change with the cube of our speed change. So, let’s make this practical. Say you bought a fan and you knew that the operating point you were going to be at was 100HP. And at 100HP you were going to be operating at 1800 RPM, your volume that you needed was going to be 10,000 CFM, and your pressure that you needed was going to be 20 inches of water. Again, the horsepower you designed it for was 100HP. But you were thinking ahead to “future you.” So you said “eventually, I’m going to want to do more,” and so you put a 150HP motor on your fan. Good job thinking ahead. We’re going to show you what happens if you say I’m going to take my speed up to 2000RPM using fan laws. So what happens when we speed the fan up? The volume we’re going to gain a factor of 2000 to 1800. That is 11,111CFM. Pressure, we’re going to gain a factor of 2000 divided by 1800 squared and then multiply that by 20, and we get 24.7 inches of water. And that third thing, and that’s why you sized your motor larger. Our horsepower is going to change with the cube of 2000 divided by 1800. So that number multiplied by 100 gives us 137.2HP. And now you see what happens when you use fan laws to predict what you’re going to get when you speed up or slow down your fan. VISIT OUR WEBSITE: https://airprofan.com/ SUBSCRIBE TO OUR CHANNEL FOR OTHER VIDEO TIPS & HELPFUL INFO:    / @airprofan   SUBSCRIBE TO OUR EMAIL LIST: https://airprofan.com/contact/ LET’S CONNECT! Email: fans@airprofan.com LinkedIn:   / airpro-fan-and-blower   #IndustrialFans #CentrifugalFans #Manufacturing