The heat dissipation method of LED cooling technology
Thermal issue is an important factor affecting the lighting intensity of LED lamps. The heat sink can solve the heat dissipation problem of low-illuminance LED lamps, but a heat sink cannot solve the heat dissipation problem of high-power lamps.
In order to achieve the ideal lighting intensity, active cooling technology must be used to solve the heat released by the LED lamp components, and then some active cooling solutions such as fans have a lifetime that is not as long as that of LED lamps.
In order to provide a practical active cooling solution for high-brightness LED lamps, the heat dissipation technology must have low energy consumption and be applicable to small lamps with a lifespan similar to or higher than the lamp source.
The method of heat dissipation
01. Air cooling
Air-cooled heat dissipation is the most common way to dissipate heat, and it is also a cheaper way. Air cooling is essentially the use of a fan to take away the heat absorbed by the radiator. It has the advantages of relatively low price and convenient installation. However, it is highly dependent on the environment, for example, the heat dissipation performance will be greatly affected when the temperature rises and overclocking.
02. Liquid cooling
Liquid cooling heat dissipation is the forced circulation of the liquid driven by the pump to take away the heat of the radiator. Compared with air cooling, it has the advantages of quietness, stable cooling, and less dependence on the environment. The price of liquid cooling is relatively high, and installation is relatively troublesome. At the same time, try to install in accordance with the instructions in the manual to get the best heat dissipation effect. For cost and ease of use considerations, liquid-cooled heat dissipation usually uses water as the heat-conducting liquid, so liquid-cooled radiators are often referred to as water-cooled radiators. WeChat public account: Shenzhen LED Network
03. Heat pipe cooling
The heat pipe is a kind of heat transfer element. It makes full use of the principle of heat conduction and the fast heat transfer properties of the refrigerant. It transfers heat through the evaporation and condensation of the liquid in the fully enclosed vacuum tube. It has extremely high thermal conductivity and good isothermal properties. 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, and a series of advantages, and the heat exchanger composed of heat pipes has high heat transfer efficiency, compact structure, small fluid resistance, etc. advantage. Its thermal conductivity has far exceeded the thermal conductivity of any known metal.
04. Semiconductor refrigeration
Semiconductor refrigeration is to use a special type of semiconductor refrigeration chip to produce a temperature difference when it is energized to cool. As long as the heat at the high temperature end can be effectively dissipated, the low temperature end will be continuously cooled. A temperature difference is generated on each semiconductor particle, and a refrigeration sheet is formed by connecting dozens of such particles in series, thereby forming a temperature difference on the two surfaces of the refrigeration sheet. Using this temperature difference phenomenon, combined with air cooling/water cooling to cool the high temperature end, excellent heat dissipation effect can be obtained.
Semiconductor refrigeration has the advantages of low cooling temperature and high reliability. The cold surface temperature can reach below minus 10℃, but the cost is too high, and it may cause short circuits due to low temperature, and the current semiconductor refrigeration technology is not mature and insufficient practical.
05. Chemical refrigeration
The so-called chemical refrigeration is to use some ultra-low temperature chemical substances, and use them to absorb a lot of heat when they melt to reduce the temperature. In this regard, the use of dry ice and liquid nitrogen is more common. For example, using dry ice can reduce the temperature to below minus 20°C, and some more exaggerated players use liquid nitrogen to lower the CPU temperature below minus 100°C (in theory). Of course, due to the high price and the short duration, this method is often used. Seen in the laboratory or extreme overclocking enthusiasts.
