12025 DC fan Router radiator fan Silent and large air volume of heat dissipation industrial DC blossom

Weeng volume and wind pressure:

There are two types of air volume and wind pressure testing. One is to test the wind cave instrument, and the other is to test it with dual boxes.But for ordinary users, there is no such device.It can only be based on the data provided by the manufacturer as a reference, and in the end, it depends on the cooling effect.

Evality: The air volume refers to the accumulation of the flux area of the fan ventilation area.The ventilation area is the projection area of the export area to reduce the vortex.The plane speed is the gas movement speed of the air flow through the entire plane, and the unit is M3/S.When the plane speed is certain, the larger the outer diameter of the fan leaf wheel, the larger the ventilation area, and the larger the air volume.The flat speed is determined by the rotor speed and wind pressure.When the ventilation area is certain, the larger the plane speed, the greater the air volume.The greater the air volume, the greater the air absorption of the air. When the air flow is transferred, it can take more heat to take away the heat.

Wind pressure: In order to perform normal ventilation, it is necessary to overcome the resistance within the fan ventilation stroke. The fan must generate a pressure that overcomes the air supply resistance. The measured pressure change value is called static pressure, that is, the difference between the maximum static pressure and the atmospheric pressure.It is the pressure of gas acting parallel to the surface of an object, and the static pressure is measured by holes perpendicular to its surface.The conversion of kinetic energy required for gas flow into pressure is called dynamic pressure.

To achieve the purpose of air supply, static pressure and dynamic pressure are required.The total pressure is the algebraic sum of static pressure and dynamic pressure. The total pressure refers to the amount of total pressure increase given by the fan, that is, the difference between the total pressure between the outlet and the inlet of the fan.In actual applications, the nominal maximum air volume value is not the air supply volume obtained by the actual fan heater. The large air volume does not mean that the ventilation capacity is strong.When air flows, the air flow will encounter obstacles from the fan heater or components in its flow path, and its impedance will limit the free flow of the air.That is, when the air volume increases, the wind pressure will decrease.Therefore, there must be an operating point, that is, the intersection of the fan performance curve and the wind resistance curve.At the operating point, the slope of the fan characteristic curve is the smallest, and the rate of change of the system characteristic curve is the lowest.Note that the static efficiency of the fan (air volume × wind pressure ÷ power consumption) is the best.Of course, sometimes in order to reduce the system impedance, even using a smaller fan can obtain the same air volume.