LED lighting is recognized as the next lighting technology due to its power saving, environmental protection and long life, which will replace the existing lighting technology. LED is a cold light source, afraid of heat, 80% of the electrical energy is converted into heat, there must be heat dissipation measures, although LED lighting technology has developed rapidly, there are reports of 200 watts per watt of light, but LED cooling is LED lighting Very headache, but it has not been solved effectively.
The biggest problem that hinders the popularization of LED lighting applications is the high price of LED lamps. Although the upstream LED chip manufacturers have divided most of the profits and have a large price reduction space, it is necessary to effectively allocate the entire social resources to the entire industrial chain of LED lighting, effectively reducing Cost, easy for ordinary people to buy and install, LED lighting module standardization is the only way, just like existing lighting (incandescent, fluorescent / energy saving lamps). The obstacle to the standardization of LED lighting modules is the existence of heat dissipation problems.
Humans have been studying heat transfer for hundreds of years. Heat transfer technology and technology are very mature, but in the electronics industry, the heat dissipation of electronic devices (especially chips) has received much attention, that is, in less than a decade. history. The knowledge of human mature heat transfer has not been transplanted into the electronics industry, but has started another stove, creating a lot of new terms: "active heat dissipation", "passive heat dissipation", "heat sink" does not sound what consciousness, English "sink" in It is also a very rare term in heat transfer and technology.
LED heat dissipation involves only a very small part of heat transfer—thermal conduction heat transfer and convection heat transfer (mainly air natural convection heat transfer), which is a very simple problem, in which heat transfer heat transfer can be calculated using existing heat transfer. Software, get a very accurate solution, but for convective heat transfer, it must be studied through a lot of experiments. The calculation with computer software has only academic significance, and it has no meaning in engineering technology because the error is too large.
Since the industry does not have a very clear study of the entire heat transfer process of LED heat dissipation, the convective (natural) heat transfer from the LED junction to the air and heat sink surface is analyzed, and the heat transfer temperature difference (ie, thermal resistance) in each process is occupied. Proportions, as well as factors that affect each heat transfer process, must be well known to structural engineers. Therefore, the current structure of LED lighting lamps is varied and various types of heat-dissipating technologies are used. It is proposed to use a reflow type heat pipe, like a chicken to lift a slaughter knife, and a Taiwan company invented a liquid immersion heat-dissipating technology. The invention of basic convection heat transfer knowledge has also won the Gold Award for International Invention Exhibition.
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