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Time：2022-03-01Views：0
step one:
The design of the cooling fan firstly measures the relationship between its air volume and air pressure. It is very difficult to measure the characteristics of the airflow. There are currently two methods for measuring static pressure and air volume, one is wind tunnel test, and the other is double box method. The air volume and static pressure characteristic specifications are measured by the double box method, and the air density is adjusted by using the double box method variable exhaust system to extract air. Instantly opening the nozzle will cause instantaneous changes in static pressure and air volume, and then read each static pressure. pressure reading on the gauge.
Under the conditions of standard atmosphere and fixed operating voltage and frequency, static pressure is expressed as a function of air volume and volume. The static efficiency of the cooling fan is equal to the volume of the air volume multiplied by the static pressure divided by the input electrical energy. The cooling fan includes the motor, the fan blade and the outer frame, so its efficiency includes the motor efficiency of the motor and the air flow efficiency of the fan blade and the outer frame.
Step 2:
The overall system impedance/system characteristic curve of the cooling fan When the air flows, the airflow will encounter the obstruction of the internal parts of the system in its flow path, and its impedance will limit the free circulation of the air. The change in pressure is the measured static pressure, expressed in inches of water. In order to confirm the cooling wattage of each slot row, the system designer or manufacturer must not only have the effective fan characteristic curve of the cooling fan to determine its maximum air volume, but also must know the air resistance curve of the system. Parts inside the system can cause loss of wind pressure. This loss varies with the air volume, the so-called system impedance.
In addition, the intersection of the system operating point system characteristics of the cooling fan and the fan characteristic curve is called the system operating point, which is the optimal operating point of the cooling fan. At the operating point, the change slope of the cooling fan is the smallest, and the change rate of the system characteristic curve is the lowest. Note that the static efficiency of the cooling fan (air volume × air pressure ÷ power consumption) at this time is optimized.
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