LED cooling and LED heat dissipation

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(Free-Press-Release.com) November 13, 2011 --

LED lighting heat is affecting the strength of a major factor. LED lamps energy efficient than traditional incandescent lamps is 80%, but the LED drive circuit components and a large amount of heat. If the heat emitted is not appropriate, LED lighting luminosity and life will be dramatically reduced. In order to achieve the desired lighting intensity, active cooling techniques must be used to solve the LED lighting components release heat. Some active cooling solutions such as LED lighting fan life is not high. High-brightness LED lamps in order to provide a useful active cooling solutions, heat must be low-power technology; and can be applied to a small lamp; its life with the light source similar to or higher than the light source.

Generally speaking, in accordance with the radiator to remove heat from the way, the radiator can be divided into active cooling and passive cooling. The so-called passive cooling, is through the heat sink to heat LED light source of natural heat into the atmosphere, the cooling effect and heat sink size is proportional to, but because it is the natural distribution of heat, the effect is of course greatly reduced, often used in those spaces does not require the equipment, or used to heat small components heat, as some universal also take the Northbridge motherboard passive cooling, the vast majority take an active cooling type, active cooling is forced through the fan and other cooling equipment issued to the heat sink of the heat away, which is characterized by high thermal efficiency, and small equipment.

Active cooling, heat the way from the subdivision, can be divided into air-cooling, liquid cooling, heat pipe cooling, semiconductor refrigeration, chemical refrigeration and so on.

1, air-cooled heat

Air cooling is the most common cooling method, comparatively speaking, is a cheaper way. Air-cooling fan from the essence is to use the heat absorbed by the radiator away. With relatively low prices, convenient installation. However, relatively high dependence on the environment, such as its temperature increases and cooling when overclocking performance will be greatly affected.

2, liquid cooling

Liquid cooling liquid in the pump is driven by forced circulation of the heat sink away, compared with air-cooled, with a quiet, cool and stable, a small dependence on the environment and so on. Relatively high price of liquid cooling, and the installation is relatively trouble some. At the same time try to follow the instructions to guide the installation method to install to get the best cooling effect. For cost and ease of use considerations, liquid cooling is usually used as the thermal conductivity of liquid water, so liquid cooling radiator is also often referred to as water-cooled radiator.

3, heat pipe

Heat pipe is a form of heat transfer components, which make full use of the principle of heat transfer medium and cooling properties of the rapid heat transfer through the liquid within the closed vacuum evaporation and condensation to transfer heat, with a high thermal conductivity, good isothermal sex, hot and cold sides of the heat transfer area can be arbitrarily changed, be long-distance heat transfer, temperature control and a series of advantages, and the composition of the heat pipe heat exchanger with high efficiency, compact structure, small resistance loss of fluid, etc. . Its thermal capacity has far exceeded the capacity of the thermal conductivity of any known metal.

4, semiconductor refrigeration

Semiconductor refrigeration is the use of a specially designed semiconductor chip in the power generated when the refrigerant temperature to cooling, as long as the high temperature side of the heat can be effectively dissipated, the low temperature side to be cooled constantly. In the semiconductor particles are produced each temperature, a cooling film by the dozens of such particles in series, thereby cooling the surface of a piece of the two temperature. Using this temperature phenomenon, with the air / water cooled high-temperature side, to get good heat dissipation. Semiconductor refrigeration with refrigeration temperature is low, high reliability, cold temperatures can reach minus 10 ℃, but the cost is too high, the temperature is too low and may lead to cause a short circuit, and now film semiconductor refrigeration technology is not mature enough and practical.

5, the chemical cooling

The so-called chemical refrigeration, is to use some of the ultra-low-temperature chemical substances, the use of their time in the melt to absorb large amounts of heat to reduce temperature. Use this area to dry ice and liquid nitrogen is more common. Such as the use of dry ice can reduce the temperature to minus 20 ℃ below, there are some more "abnormal" players use liquid nitrogen to the CPU temperature dropped to minus 100 ℃ the following (in theory), of course, due to their cost and duration is too short, this methods common in the laboratory or extreme overclocking enthusiasts.

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