Xsion briefly talks about outdoor LED displayHow to dissipate heat from the screen ? Extreme heat is unavoidable for each of us. Similarly, LED displays are more likely to heat up. High temperatures will cause the failure probability of electronic components to rapidly increase, resulting in a decrease in the reliability of LED displays. In order to control the temperature of the electronic components inside the LED display so that it does not exceed the specified maximum allowable temperature under the working environment conditions of the LED display, the heat dissipation design of the LED display is required. The heat dissipation design of LED display screen, how to achieve low cost and high quality, is the content of this article.
There are three basic ways of heat transfer: conduction, convection, and radiation.
Heat conduction: Gas heat conduction is the result of gas molecules colliding with each other when they move irregularly. Heat conduction in metallic conductors is mainly accomplished by the movement of free electrons. Heat conduction in non-conductive solids occurs through vibrations of the lattice structure. The heat conduction mechanism in liquids mainly relies on the action of elastic waves.
Convection: refers to the heat transfer process caused by relative displacement between various parts of the fluid. Convection only occurs in fluids and is necessarily accompanied by heat conduction. The heat exchange process that occurs when a fluid flows across the surface of an object is called convection heat transfer. The convection caused by the different densities of the hot and cold parts of the fluid is called natural convection. If the movement of the fluid is caused by an external force (fan, etc.), it is called forced convection.
Radiation: The process by which an object transmits its energy in the form of electromagnetic waves is called thermal radiation. Radiant energy transfers energy in a vacuum, and there is conversion of energy forms, that is, thermal energy is converted into radiant energy and radiant energy is converted into thermal energy.
When choosing a heat dissipation method, the following factors should be considered: heat flux density, volume power density, total power consumption, surface area, volume, working environment conditions (temperature, humidity, air pressure, dust, etc.) of the LED display, etc. According to the heat transfer mechanism, there are natural cooling, forced air cooling, direct liquid cooling; evaporative cooling; thermoelectric refrigeration; heat pipe heat transfer and other heat dissipation methods.
Heat dissipation design method for outdoor LED display
The heat exchange area between heating electronic components and cold air, and the temperature difference between heating electronic components and cold air, directly affect the heat dissipation effect. This involves the design of the air volume entering the LED display box and the design of the air duct. When designing ventilation ducts, try to use straight ducts to transport air and avoid sharp turns and curved ducts. Ventilation ducts should avoid sudden expansion or contraction. The opening angle of expansion should not exceed 20°, and the cone angle of contraction should not exceed 60°. Ventilation ducts should be sealed as much as possible and all overlaps should follow the direction of flow.
When designing outdoor LED display cabinets, there are a few points to note:
The exhaust hole should be set near the upper side of the box. The air inlet should be set on the lower side of the box, but not too low to prevent dirt and water from entering the box installed on the ground.
The design should be such that natural convection contributes to forced convection. Air should circulate from the bottom of the box to the top, and dedicated air inlets or exhaust holes should be used. Cooling air should be allowed to flow through the heat-generating electronic components while short-circuiting of the air flow should be prevented. Filters need to be installed at the air inlet and outlet to prevent debris from entering the box.
When designing, ensure that the air inlet and exhaust port are far away. Avoid reusing cooling air.
Make sure that the direction of the radiator tooth grooves is parallel to the wind direction, and the radiator tooth grooves cannot block the air path.
When the fan is installed in the system, due to structural limitations, the air inlet and outlet are often blocked by various obstructions, and its performance curve will change. According to actual experience, it is best to have a distance of 40mm between the fan's air inlet and outlet and the obstruction. If there is space restriction, it should be at least 20mm.
The above is how to deal with the heat dissipation of the outdoor LED display provided by Shenzhen Xinshian Information Technology Co., Ltd. If you want to know more about the outdoor LED display, please visit our official website.