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Time：2022-03-10Views：0
DC fan manufacturers tell you what is called air volume and what is called wind pressure. And how does the air volume and air pressure affect the fan's heat dissipation performance? Usually we only know that the air volume is large and the air blowing out is hot, so the heat dissipation will be better. Is this statement correct? Why? What? These are the questions we need to discuss today. Let's first understand what is called air volume and air pressure:
The air volume and air pressure of the fan are the main factors that determine the cooling efficiency. After the external specifications of the fan are determined, the key requirements for the characteristics of the fan are the air volume and air pressure, not the fan speed. Usually people will misunderstand this point and start using A The fan speed of the manufacturer is 2400RPM, as long as the fan of manufacturer B is also 2400RPM, this is completely wrong. Let me give you an example:
For example, manufacturer A's 4028 fan speed is 8000RPM, air volume is 30CFM, wind pressure is 15mmHO2, rated current is 0.16A, and noise is 30dB; then manufacturer B's 4028 fan speed is 7500RPM, air volume is 32CFM, wind pressure is 15.6mmHO2, and rated current is 0.14A, the noise is 30dB; from the numerical point of view, the parameters of manufacturer B will be better than those of manufacturer A, and the 7500RPM fan of manufacturer B can be used as a substitute for the 8000RPM fan of manufacturer A (other qualities are consistent with the premise), so we The choice of the fan is not based on the specification speed, but on the air volume & air pressure.
Air volume: Air volume is the volume of air per minute and the air sent out or inhaled [unit M3/min (ft3/min), how many cubic meters (cubic feet) per minute]. (CFM or CMM)
Wind pressure: Wind pressure is the pressure that the fan needs to generate when it overcomes the resistance to supply air, which is divided into static pressure and dynamic pressure. Static pressure refers to the pressure measured parallel to the direction of airflow, and dynamic pressure is the process of converting kinetic energy required for gas flow into pressure [unit: mm/H2O (inch/H2O), how many mm (inch) of wind pressure water column].
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