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Time：2021-12-03Views：0
The relevant specifications produced by the DC cooling fan manufacturers have different units for the air volume. Most of them use CFM: Cubic Feet Per Minute, cubic feet per minute (ft3/min), but also L/ min: Liter Per Minute, liters/minute (L/min, when you want to choose the same air volume DC cooling fan but because of different units, you need to have a parameter conversion comparison table,
In practical applications, the nominal maximum air volume value is not the air volume obtained by the actual heat sink. The large air volume does not mean that the ventilation capacity is strong. When the air flows, the airflow will encounter the obstruction of the radiating fins in its flow path, and its impedance will restrict the free circulation of air. That is, when the air volume increases, the wind pressure will decrease. Therefore, there must be an optimal operating point, that is, the intersection of the performance curve of the cooling fan and the wind resistance curve. At the operating point, the slope of the fan characteristic curve is the smallest, and the change rate of the system characteristic curve is the smallest.
When we are not completely sure how much air volume and wind pressure can achieve the heat dissipation effect, the easiest way is to directly test the installation and test whether the heat dissipation performance can achieve the desired effect.
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