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Views: 30 Author: Site Editor Publish Time: 2021-04-06 Origin: Site
The way of heat dissipation refers to the main way that the custom aluminum heat sink radiates heat. In thermodynamics, heat dissipation is heat transfer, and there are three main ways of heat transfer: heat conduction, heat convection and heat radiation. The material itself or when the material comes into contact with the material, the transfer of energy is called heat conduction, which is the most common way of heat transfer. For example, the direct contact between the CPU custom heat sink base and the CPU to take away heat is heat conduction. Thermal convection refers to the heat transfer method in which the flowing fluid (gas or liquid) moves the heat away. In the heat dissipation system of the computer case, the "forced heat convection" heat dissipation method in which the cooling fan drives the gas flow is more common. Thermal radiation refers to the transfer of heat by radiation, and the most common thing in daily life is solar radiation. These three heat dissipation methods are not isolated. In daily heat transfer, these three heat dissipation methods all happen at the same time and work together.
In fact, any type of aluminum heat sink basically uses the above three heat transfer methods at the same time, but the focus is different. For example, ordinary CPU aluminum extrusion heat sink CPU heat sink is in direct contact with the CPU surface, and the heat on the CPU surface is transferred to the CPU heat sink through heat conduction; the cooling fan generates airflow to take away the heat from the surface of the CPU heat sink through thermal convection; while the air inside the chassis The flow is also through thermal convection to take away the heat of the air around the CPU heat sink to the outside of the chassis; at the same time, all parts with high temperature will radiate heat from the 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.
According to the way heat is taken away from the radiator, the radiator can be divided into active heat dissipation and passive heat dissipation. The former is commonly used as air-cooled radiators, while the latter is commonly referred to as heat sinks. Further subdivide the heat dissipation methods, which can be divided into air cooling, heat pipe, liquid cooling, semiconductor refrigeration, compressor refrigeration and so on.
Air-cooled heat dissipation is the most common, and very simple, is to use a fan to take away the heat absorbed by the custom heat sink. It has the advantages of relatively low price and simple installation, but it is relatively dependent on the environment. For example, the heat dissipation performance will be greatly affected when the temperature rises and overclocking.
A heat pipe is a heat transfer element with extremely high thermal conductivity. It transfers heat through the evaporation and condensation of liquid in a fully enclosed vacuum tube. It uses fluid principles such as hair absorption to achieve a cooling effect similar to a refrigerator compressor. It has a series of advantages such as extremely high thermal conductivity, good isothermality, the heat transfer area on both sides of the cold and heat can be changed arbitrarily, heat can be transferred over a long distance, temperature can be controlled, etc., and the heat exchanger composed of heat pipes has heat transfer efficiency High, compact structure, low fluid resistance and other advantages. Due to its special heat transfer characteristics, the tube wall temperature can be controlled to avoid dew point corrosion.
Liquid cooling uses liquid to forcefully circulate under the drive of a pump to take away the custom heat sink
Compared with air cooling, it has the advantages of quietness, stable cooling, and less dependence on the environment. However, the price of heat pipes and liquid cooling is relatively high, and installation is relatively troublesome.
When purchasing a custom heat sink, you can choose it according to your actual needs and economic conditions. The principle is that it is enough.
