How is the cooling fan designed?

What are the design steps for cooling fans? 1. The design of the cooling fan first measures the relationship between air volume and air pressure. It is very difficult to measure the characteristics of airflow. Currently, there are two methods for measuring static pressure and air volume, one for wind tunnel tests and the other for double box mode. The air volume and static pressure characteristics are measured in a double box mode. The double-box variable exhaust system draws air to adjust the air density. Opening the nozzle immediately will cause the static pressure and air volume to change instantaneously, and then read each static pressure. Pressure reading on the gauge. Static pressure is a function of air volume as a function of standard atmosphere and fixed operating voltage and frequency. The static efficiency of the cooling fan is equal to the volume of air multiplied by the static pressure divided by the input electrical energy. The cooling fan is contained in the motor blades and frame, so its efficiency includes the motor efficiency of the motor and the air flow efficiency of the blades and frame. 2. All system impedance/system characteristic curves of the cooling fan. When the air flows, the airflow will meet the internal components of the system in its flow path, and its impedance will restrict the free flow of air. The change in pressure is the measured static pressure, expressed in inches of water. In order to determine the cooling power of each fuel tank row, the system designer or manufacturer must not only have the effective cooling fan characteristic curve of the cooling fan to determine its maximum air volume, but also must know the wind resistance curve of the system. Parts in the system may cause the wind pressure to drop. This loss varies with air volume, the so-called system impedance. In addition, the intersection of the system operating point of the cooling fan and the characteristic curve of the cooling fan is called the system operating point, which is the best operating point of the cooling fan. At the operating point, the slope of the cooling fan is the smallest, and the rate of change of the system characteristic curve is the smallest. Note that at this time, the static efficiency of the cooling fan (air volume × wind pressure, power consumption) is optimized. In addition, we must take care to keep the air flow as undisturbed as possible during the design process. The air inlet and outlet are kept unobstructed, and the airflow of the cooling fan passes through the system vertically to ensure unobstructed airflow. Stable and improve heat dissipation efficiency.