How to select fan or drum fan correctly

All design engineers of motors and electronic products that need to use fans for heat dissipation must determine the air volume required for heat dissipation of a specific system, and the air volume required depends on knowing the power consumption of the system and whether it can take enough heat away, so as to prevent overheating of the system. The fact shows that the service life of the system will be reduced due to the lack of cooling system, so the design engineer should also understand that the sales volume and price of the system may be reduced because the service life of the system does not meet the user's expectation.
To select the correct ventilation components, the following objectives must be considered:
Best air flow efficiency
Minimum fit size
Minimum noise
Minimum power consumption
Maximum reliability and service life
Reasonable total cost
The following steps can help you achieve these goals.
The first is to know the total cooling demand. To understand the total cooling demand, there are three points as follows
1. Heat that must be converted (i.e. temperature difference DT)
2. Wattage (W) to offset the converted heat
3. Air volume required to remove heat (CFM)
Total cooling requirements are important for the efficient operation of the system. Efficient system operation must provide ideal operation conditions, so that all components in the system can play the maximum function and the longest service life.
Secondly, through the understanding of the total cooling demand, the air volume required by the equipment can be obtained by the following methods.
1. Calculate the heat generated in the equipment.
2. Determine the allowable temperature rise range inside the equipment.
3. Calculate the required air volume from the equation.
If the internal heat dissipation of the system equipment and the allowable total temperature rise are known, the air volume required for cooling equipment can be obtained. The specific calculation method is shown in the following equation.