Ako efektívne odvádzať teplo z vonkajších LED obrazoviek

Kvôli hustej hustote pixelov, LED displeje generujú veľké množstvo tepla. Prolonged outdoor use will inevitably lead to a gradual increase in internal temperature, especially for larger outdoor LED displays. Heat dissipation has become a critical issue that must be taken seriously. The heat dissipation of LED displays indirectly affects their service life, and even directly affects their normal use and safety. How to dissipate heat has also become a problem that display screens must consider.

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

Thermal conductivity: Gas thermal conductivity is the result of collisions between gas molecules during irregular motion. The thermal conductivity in metal conductors is mainly achieved through the movement of free electrons. Thermal conductivity in non-conductive solids is achieved through the vibration of the lattice structure. The thermal conductivity mechanism in liquids mainly relies on the action of elastic waves.

Convection: refers to the process of heat transfer caused by relative displacement between different parts of a fluid. Convection only occurs in fluids and is inevitably accompanied by thermal conductivity. The heat exchange process that occurs when a 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 motion of the fluid is caused by external forces (such as fans), it is called forced convection.

Radiation: The process by which an object transmits its ability in the form of electromagnetic waves is called thermal radiation. Radiation energy transfers energy in a vacuum and undergoes energy conversion, to jest, thermal energy is converted into radiation energy and radiation energy is converted into thermal energy.

When choosing a heat dissipation method, the following factors should be considered: heat flux density, volumetric power density, total power consumption, surface area, volume, working environment conditions (teplota, vlhkosť, air pressure, dust, atď.) of the LED display screen.

According to the heat transfer mechanism, there are natural cooling, forced air cooling, and direct liquid cooling; Evaporative cooling; Thermoelectric cooling; Heat pipe heat transfer and other heat dissipation methods.

Heat dissipation design method for outdoor LED display screens

The heat exchange area between the heating electronic components and the cold air, as well as the temperature difference between the heating electronic components 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 pipes to transport air and avoid using pipes with sharp bends or bends. Ventilation ducts should avoid sudden expansion or contraction. The expansion angle should not exceed 20o, and the contraction cone angle should not exceed 60o. Ventilation ducts should be sealed as much as possible, and all overlaps should follow the direction of flow.

When designing outdoor LED display screens, there are several points to note:

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 maintenance plan for outdoor LED display screens includes measures to dissipate heat and avoiding improper operation during use. It is generally recommended to install a fan or air conditioner to enhance the cooling function.