What determines the performance of the fan?
The unit RPM of the speed means how many revolutions per minute. The general fan speed varies from hundreds to 12000, and some violent fans even reach the terrible tens of thousands of turns But only can say that the speed has a certain impact on performance, but it is not fast performance must be much better.
Because each fan is designed differently and has different performance at different speeds, it may be that one fan has a general performance at low speed, but the speed is not as fast as possible. So it is not absolutely who is strong or weak, just like a runner, some are good at long-distance running and some are good at sprinting.
Air volume
For fans, one of the most important parameters is actually air volume. The air volume is the volume of air delivered in a certain time. The most common unit is CFM (how many cubic feet per minute)
wind pressure
In a computer fan, usually static pressure, in mmh2o (mm water column)
The significance of high wind pressure is to blow through dust net, cooling tower, water cooling exhaust, etc. Generally speaking, it is the cohesion, impact and penetration of wind.
noise
Noise is a problem that many people care about, in dB (a), that is, decibels. Often the sound will be very light when the speed is low, but once the speed is up, the noise will be higher to varying degrees. Of course, there are many factors affecting noise. Besides wind noise, fans with poor dynamic balance will cause resonance noise, or bearing difference will also have shaft noise, and noise can also be divided into high and low frequency, and quality control of different batches and brands also affects. So it is still subject to what you actually hear.
dynamic balance
The fan with bad dynamic balance will cause resonance and noise. Why is dynamic balance important? Because the fan is doing circular centrifugal movement, as long as any deviation of the fan's cut-off surface, more or less will affect the balance of fan rotation, it will shake up. As soon as this shake, the noise will be loud.
appearance
What's the use of performance? What ordinary consumers want is still good-looking
life
Different bearing structures make the fan life different. The most common is ball bearings
In general, these are the factors that have a greater impact. Of course, the design of grinding tools, frames, blades and other small details also has a small role. The excellent heat dissipation effect is determined by many factors. They interact and help each other to maximize the potential of fans.