LED display screens are electronic products, and it is a normal phenomenon to generate heat during use.
Small-area LED displays, such as signs, door screens, small promotional window screens, etc., have limited area, limited power, and limited heat generation. Generally, we do not need to consider heat dissipation issues. However, for large-area indoor LED displays and outdoor large screens, due to the huge accumulation of heat, we often have to consider heat dissipation issues.
So what situations should we consider? We will sort it out from the following aspects.
1. Power and area
Power is a primary consideration. The general industry standard practice is that indoor LED display display power does not need to consider heat dissipation when the playback power is below 5KW, and the corresponding conversion area is generally within 10 square meters. Outdoor LED displays are much more stringent. First of all, the power and heat generation of outdoor LED displays are much larger than those of indoor LED displays of the same area. They are generally below 5KW and do not need to consider heat dissipation issues. The corresponding conversion area is generally 5 square meters. The outdoor LED display within 1 meter does not need to consider heat dissipation issues.
2. Direct sunlight
Indoor LED displays generally do not involve direct sunlight. Outdoor LED large screens are mostly used to play advertisements, government videos, public service announcements, etc. The temperature will rise to very high levels when exposed to direct sunlight for a long time. Especially in summer, the surface temperature of large outdoor LED screens can easily rise to over 100°C. If the internal structure of the screen is not heat dissipated and the air does not circulate, the temperature will rise even higher. Therefore, as long as there is direct sunlight, we usually build a heat dissipation structure.
3. The size of the space inside (rear) the screen
Generally speaking, the front (front) of the LED display is the playback surface, with open space for heat dissipation, while the situation inside (back) varies widely. If the inside (behind) of the LED display screen is a conventional small and limited space, we decide whether to build a heat dissipation structure based on the first two factors. But there are also some with large rear space and good ventilation conditions that we don’t need to build a heat dissipation structure.
So based on the above three factors, when the evaluation results require adding a heat dissipation device, what should we do? The following three points are the methods we often use.
1. Add a fan
Fans are most commonly used in waterproof boxes for large outdoor LED screens. The thickness of the box is generally about 10 centimeters, which means that the space inside (behind) the screen is very small. We generally use fans to build a circulation ventilation system. A common practice is to install them on the back door of the waterproof box. Two fans are added to the half part, one fan blows inward and the other blows outward. The hot air inside the box is mainly in the upper part. This creates a cool air from the outside in and the hot air from the inside blows out. Circulation ventilation system.
We also use similar ideas in simple box outdoor large screen projects. We leave a ventilation grille at the bottom of the entire large screen, and use four 500W high-power fans to blow hot air out at the top of the large screen, thus forming an external cool breeze that flows in from the bottom, hot air automatically flows upward, and the hot air at the top flows out. Blowing such a circulating heat dissipation channel.
2. Increase air conditioning.
In outdoor large-screen projects, we often use air conditioners to cool down LED displays. In large outdoor LED display projects exceeding 20 square meters, we will calculate the number of air conditioners based on the area. The internal unit of the air conditioner outputs cold air to cool the screen, and the external unit of the air conditioner is installed on the side or rear of the screen.
Generally, when we use air conditioners, we also use fans at the same time. We add fans at the bottom and top (or up and down the sides) to build circulation ventilation channels.
3. Expand the space behind the screen
Expand the space behind the screen. This method is suitable for indoor LED displays. When welding the steel structure of the LED display, you can communicate with the customer to enlarge the space behind the screen, such as leaving 60 cm or more than 80 cm in width. Maintenance lane. In this case, the space behind the screen is large enough, and with the addition of a fan, the heat generated by the screen can be easily dissipated.
