There are many products on the market, claiming to effectively improve the radiation heat dissipation efficiency of the radiator. This product is a coating that is directly sprayed onto the surface of the heat sink to enhance radiation dissipation.
LED heat dissipation is generally natural heat dissipation, including natural convection and radiation. The main factors affecting natural convection are the surface area and wind speed of the heat sink.
The main factors affecting radiative heat dissipation are the surface area of ​​the heat sink and the surface emissivity of the fin. In the case of the same surface area, if the emissivity (also called blackness) differs greatly, the junction temperatures of the LEDs will vary greatly.
Some people have a misconception that the darker the surface, the higher the emissivity, but this is not the case. Because there are many white objects whose radiance is also very high, the common one is snow. You are not mistaken, and its radiance is as high as 0.95. In the black object, the radiance of the black light (that is, the black layer left after the candle is smoked) is as high as 0.95. Therefore, the emissivity cannot see the surface and cannot see the color.
Commonly used heat sink materials are generally aluminum alloy, copper alloy, ceramic, graphite sheet, plastic and so on.
The common radiator surface emissivity is as follows:
The radiance values ​​in this table are empirical values ​​based on simulation calculations and measurements. Non-measured value, only for calculation reference.
A manufacturer on the Internet provided a coating that is said to achieve the following results:
From the data point of view, the use of its coating is reduced by about 10 ° C than anodizing. This effect is good. But I don't know under what circumstances I tested it. Whether the anodizing is the best one.
Japanese manufacturers like the white appearance very much, so big factories like Panasonic and Toshiba make the light bulbs like a work of art, pure white, and look beautiful. This white color is usually painted or porcelain treated.
The effect of painting/porcelain and anodizing is not much different, but the anodizing process is relatively simple, the cost is low, and the defect rate is low. Therefore, the heat sink of the IT industry has been anodized to enhance the surface treatment of radiation.
The disadvantage of anodizing is that it has an unsightly appearance and cannot be textured like paint/porcelain, pure white, and high-grade. This estimate is a difference between the design of the LED lamp heat sink and the heat sink design of the traditional electronics industry.
Side View Camera,Rear View Camera,Camera Parking,Camera Reverse
Shenzhen Sunveytech Co.,LTD , https://www.sunveytech.com