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Interpretation of the heat transfer method of low-noise DC fans

Time：2022-03-03Views：0

Low noise DC fan air pressure and air volume are two relative concepts. Generally speaking, under the consideration of cost saving by manufacturers, DC cooling fans must sacrifice some air pressure to design the fan with a large air volume. If the fan can drive a lot of air flow, but the wind pressure is small, the wind cannot blow to the bottom of the radiator (this is why some fans rotate at high speed and the air volume is large, but the heat dissipation effect is not good), on the contrary, High wind pressure often means that the air volume is small, and there is not enough cold air to exchange heat with the heat sink, which will also cause poor heat dissipation. Chengda low noise DC fan welcomes you to buy!

Any type of radiator is basically inseparable from the following three heat transfer methods, but the focus is different.

1. Heat conduction, heat convection and heat radiation. The transfer of energy in matter itself or when matter comes into contact with matter is called heat conduction, which is the most common form of heat transfer. For example, the direct contact between the CPU heat sink base and the CPU to take away heat is thermal conduction.

2. Thermal convection: It refers to the heat transfer method in which the flowing fluid (gas or liquid) takes the heat away. In the cooling system of the computer case, the "forced thermal convection" cooling method in which the cooling fan drives the gas flow is more common.

3. Thermal radiation: refers to the transfer of heat by means of ray radiation, the most common of which is solar radiation in daily life. These three heat dissipation methods are not isolated. In daily heat transfer, these three heat dissipation methods all occur at the same time and work together.

For example, in an ordinary CPU air-cooled cooling fan, the CPU heat sink is in direct contact with the surface of the CPU, and the heat on the CPU surface is transferred to the CPU heat sink through thermal conduction; the DC cooling fan generates airflow to take away the heat on the surface of the CPU heat sink through thermal convection; while the chassis The flow of the inner air also takes away the heat of the air around the CPU heat sink through thermal convection until the outside of the chassis; at the same time, all parts with high temperature will radiate heat to parts with low surrounding temperature.

The heat dissipation efficiency of the radiator is related to the thermal conductivity of the radiator material, the heat capacity of the radiator material and the heat dissipation medium, and the effective heat dissipation area of the radiator.

What are the inherent flaws of DC cooling fans?

The most widespread form is the use of axial fans (which is the most common type of fan) to blow down air, which is so popular because of the combined effect and low cost. If the direction of the axial flow fan is reversed, it becomes an upward draft, which is used in some special models of radiators. The difference between the two types of air supply lies in the different air flow forms. When blowing, the turbulent flow is generated, and the wind pressure is large but it is easy to suffer resistance loss; when the air is exhausted, the laminar flow is generated, and the wind pressure is small but the air flow is stable. Theoretically, the heat dissipation efficiency of turbulent flow is much greater than that of laminar flow, so it has become the mainstream design form. Axial fans, although widely used, also have inherent drawbacks. Axial fans are blocked by the position of the motor, and the airflow cannot flow smoothly through the middle of the blowing area, which is called "dead zone".

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Interpretation of the heat transfer method of low-noise DC fans