The hottest period of summer is coming, how to do a good job of heat dissipation for outdoor LED dis

The hottest period of summer is coming, how to do a good job of heat dissipation for outdoor LED displays?

by:XY Screens     2021-09-17
In the past few days, high temperatures have prevailed throughout the country, and the outside is as hot as a boiler, and it is impossible to go out. Similarly, the LED display screen is also heat-resistant, and the LED display screen itself is also a heating element, and the probability of failure of electronic components in a high temperature environment will increase, resulting in a decrease in the reliability of the LED display screen. In order to control the temperature of the internal electronic components of the outdoor LED display, so that the LED display can not exceed the specified maximum allowable temperature, it is necessary to carry out the heat dissipation design of the LED display. Today, I will take you to discuss the heat dissipation design of outdoor LED displays. First, let's talk about the transfer methods of heat: convection, radiation and heat conduction. Convection refers to the process of heat transfer caused by relative displacement between various parts of the fluid. Convection only occurs in the fluid, and it must be accompanied by the phenomenon of heat conduction. The heat exchange process that occurs when fluid flows over the surface of an object is called convective 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 external forces (fans, etc.), it is called forced convection. The process by which a radiating object transfers its ability in the form of electromagnetic waves is called thermal radiation. Radiant energy transfers energy in a vacuum, and there is a conversion of energy form, that is, thermal energy is converted into radiant energy and radiant energy is converted into thermal energy. Heat conduction The heat conduction of the gas is the result of gas molecules colliding with each other when they move irregularly. The heat conduction in metal conductors is mainly accomplished by the movement of free electrons. Heat conduction in non-conductive solids is achieved by the vibration of the lattice structure. The heat conduction mechanism in the liquid mainly relies on the action of elastic waves. Let's talk about the heat dissipation design method of LED screens. When choosing heat dissipation methods for outdoor LED displays, several factors should be considered: heat flow density, volume power density, total power consumption, surface area, volume, and working environment conditions of the LED display ( Temperature, humidity, air pressure, dust, etc.) etc. According to the heat transfer mechanism, there are natural cooling, forced air cooling, direct liquid cooling; evaporative cooling; thermoelectric cooling; heat pipe heat transfer and other heat dissipation methods. The heat exchange area between the heating electronic parts and the cold air, and the temperature difference between the heating electronic parts and the 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 bends and bends. Ventilation ducts should avoid sudden expansion or sudden contraction. The expanded angle should not exceed 20°, and the contracted cone angle should not exceed 60°. The ventilation ducts should be sealed as far as possible, and all overlaps should follow the direction of flow. When designing the LED display cabinet, there are several points to note: 1. The design should make natural convection help forced convection. The air should circulate from the bottom to the top of the box, and special air intake or exhaust holes should be used. The cooling air should be allowed to flow through the heat-generating electronic components, and the air current should be prevented from short-circuiting. Filters should be installed at the air inlet and outlet to prevent debris from entering the box. 2. The fan is installed in the system. Due to structural limitations, the air inlet and outlet are often blocked by various obstacles, and its performance curve will change. According to actual experience, the air inlet and outlet of the fan should be 40mm away from the obstruction. If there is space limitation, it should be at least 20mm. 3. When designing, make sure that the air inlet and the air outlet are kept away from each other. Avoid repeated use of cooling air. 4. The exhaust hole should be located 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. 5. Make sure that the radiator cogging direction is parallel to the wind direction, and the radiator cogging cannot block the wind path. The above is the heat dissipation design and precautions of outdoor LED displays. In the hot summer, the high temperature of outdoor LED large screens will cause various problems and fire hazards. Therefore, you must design heat dissipation in advance when installing LED displays. Function, so as not to bring unnecessary trouble.
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