A new idea for developing high-power energy-saving LED lighting devices
Cooling method advantages Disadvantages Air cooling cost Low noise, poor reliability, limited heat dissipation, high liquid cooling reliability, no rotating parts, large heat dissipation, limited heat pipe, light weight, large heat transfer, general need to install fan, tube is not mature thermoelectric Small cooling capacity, no noise, low power consumption, and low heat and power conversion efficiency. Electromechanical engineering With the application of high-power LEDs, the existing heat dissipation technology cannot meet the requirements for use. The first is a thermal bottleneck that is limited by high power. When the LED power density is increased, especially for small-area packaging of 100-watt LED products, the power density may be as high as tens of thousands of W/m. At this time, ordinary forced air convection, liquid cooling, heat pipe, and thermoelectric methods are difficult to meet the demand. Second is limited by the high temperature environment. For example, in some tropical areas or the ceiling of a building (the area that cannot be covered by the central air conditioner), the outside temperature can be as high as 45 ° C or higher. The cooling methods such as air cooling, heat pipe cooling, water cooling, and liquid metal cooling are limited by environmental conditions and temperature. Unable to meet the cooling requirements. Therefore, it is necessary to seek a new cooling route.
The vapor compression refrigeration system utilizes the phase change heat absorption of the refrigerant working medium to achieve the purpose of refrigeration, has the advantages of strong heat dissipation capability and wide temperature adjustment range, and is an advantageous solution suitable for heat dissipation of high power LEDs. At the same time, the heat of the condensing load can be effectively utilized. In combination with the thermoelectric conversion device, the heat of the high-power LED is solved, and the heat discharged from the LED chip and the condenser is recovered, so that it is converted into electric energy, which is a high-power and energy-saving type. A new idea for LED lighting. Introduction to the new energy-saving vapor compression refrigeration system The workflow of the energy-saving vapor compression refrigeration system. The system mainly includes two parts: a vapor compression refrigeration system and a thermoelectric converter. Inside the refrigeration system, the refrigerant is sucked into the compressor, adiabatically compressed and becomes superheated steam, then enters the condenser, is cooled by constant pressure and further condensed into a saturated liquid, which in turn is cooled by adiabatic throttling and cooling through a throttle valve. It becomes a low-drying wet steam, and the wet steam is introduced into the evaporator of the cold chamber, and the heat is vaporized into dry saturated steam to complete a cycle. The evaporator is placed close to the inner substrate to absorb the heat emitted by the LED substrate to provide cooling for the LED chip.
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