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Outdoor LED display how to make good heat?
Nov 13, 2017

    High temperature will lead to the rapid increase of the probability of failure of electronic components, leading to decline in the reliability of led display. In order to control the temperature of LED display internal electronic components, so that the LED display where the working environment, does not exceed the maximum allowable temperature, the need for led display thermal design. LED display thermal design, how can low-cost, high-quality, is the content of this article.


    


    There are three basic ways to transfer heat: heat, convection and radiation.


    Thermal Conductivity: Gas thermal conduction is the result of collisions with one another when gas molecules move irregularly. The thermal conductivity of metal conductors mainly by the freedom of electronic motion to complete. Thermal conductivity in a non-conductive solid is achieved by vibration of the lattice structure. The mechanism of thermal conductivity in liquids mainly depends on the action of elastic waves.

    Convection: refers to the relative displacement between the various parts of the fluid caused by the heat transfer process. Convection occurs only in the fluid, and must be accompanied by a thermal phenomenon. The heat exchange process that occurs when a fluid flows through the surface of an object is called convection heat transfer. Convection caused by the difference in density between the hot and cold parts of the fluid is called natural convection. If the fluid movement caused by external forces (fans, etc.), then called forced convection.

    Radiation: The process of transferring an object's ability as an electromagnetic wave is called thermal radiation. Radiation energy transfers energy in a vacuum, and there is a form of energy conversion, ie thermal energy is converted into radiant energy and radiant energy is converted into thermal energy.

    Select the cooling mode, should consider the following factors: led display heat flux density, volume power density, total power consumption, surface area, size, working conditions (temperature, humidity, pressure, dust, etc.).

    According to heat transfer mechanism, natural cooling, forced air cooling, direct liquid cooling; evaporative cooling; thermoelectric cooling; heat pipe heat dissipation and other cooling methods.


    LED screen thermal design

   Heating electronic components and cold heat exchange area, heating electronic components and the temperature difference between cold wind, a direct impact on cooling effect. This involves the size of the air into the led display cabinet design, duct design.

    Ventilation duct design, try to use straight duct air, avoid sharp turning and bending of the pipe. Ventilation ducts should avoid sudden expansion or sudden contraction.

    Do not extend the opening angle of more than 20 °, shrinking cone angle of not more than 60 °. Ventilation pipe should be sealed as far as possible, all overlap should be along the flow direction.


    There are attentions in designing led display:

    Vent holes should be located near the upper side of the tank. The air inlet should be set on the lower side of the box, but not too low to avoid dirt and water entering the box installed on the ground.

    Design should allow natural convection helps to force convection. The air should circulate from the lower part of the cabinet to the upper part, and a special air inlet or exhaust hole should be used. The cooling air should flow from the hot electronic components, and at the same time to prevent short-circuit airflow. Intake, exit at the need to set the filter to prevent debris into the cabinet.

    Design to ensure that the inlet and exhaust away. Avoid reuse of cooling air.

    To ensure that the direction of the radiator gullets parallel to the wind direction, the radiator gullets can not block the wind path.

    Fans installed in the system, due to structural constraints, the inlet and outlet are often subject to a variety of barriers, the performance curve will change. According to actual experience, the fan inlet and outlet with the best barrier 40mm distance, if there is space constraints, it should be at least 20mm.