Whether we choose a cooling fan to solve the heat dissipation problem, we mainly evaluate from two parameters, one is the air volume of the cooling fan and the other is the air pressure. The air volume of the axial-flow cooling fan of the same size is larger than that of the turbine type, and the pressure is just the opposite.

 

Air volume refers to the total volume of air sent or sucked in by the air-cooled radiator fan per minute. If it is calculated in cubic feet, the unit is CFM; if it is calculated in cubic meters, it is CMM. The air volume unit often used in radiator products is CFM.

 

Wind pressure is blocked by the building, so that the surrounding air is blocked, the dynamic pressure drops, and the static pressure rises. Partial eddy currents are generated on the side and back, the static pressure drops, and the dynamic pressure rises. Compared with the undisturbed air flow in the distance, this increase and decrease of static pressure is collectively called wind pressure. Simply put, wind pressure is the pressure of the wind on a plane perpendicular to the direction of the air flow.

 

In view of the characteristics of these two parameters, if we use exhaust air or heat dissipation problems that require strong wind to solve, we generally choose turbine type with high wind pressure. For the heat dissipation problem of direct blowing, we generally adopt the axial flow type with large air volume.

 

Can a cooling fan with high power, large air volume and low current be ok? We often say that the power is large and the current is large, the air volume is large, and the power is small when the current is small. In fact, it can be achieved in a certain area.