In today's rapidly developing society, the transmission of information is becoming more and more efficient, and outdoor high brightness screen advertising machines have been widely used in our daily lives. Outdoor advertising machines are generally used outdoors, facing sun and rain every day. The temperature in the south is generally high, and there is also a lot of rain. Therefore, high requirements are placed on the waterproof and heat dissipation performance of outdoor advertising machines in order to withstand wind and rain. Below, the editor will introduce a comparison of three cooling methods for outdoor advertising machines.
1. Air cooling and heat dissipation
The principle of air-cooled heat dissipation is that the hot air inside the outdoor LCD advertising machine alternates with the external air to achieve cooling. At present, there is only one type of speed control board available for sale in the market, which does not have a fan start stop function, has rough workmanship, and poor stability. Therefore, advertising machine manufacturers have developed a new type of fan speed control board, which can make outdoor advertising machines more reasonable in heat dissipation, more energy-efficient and environmentally friendly.
The temperature probe of the speed control board detects the temperature inside the circulating air duct. If the temperature is lower than room temperature, the fan will not operate. When the internal temperature of the outdoor LCD advertising machine is higher than room temperature, the fan will start to operate at low speed. The internal temperature will continue to rise to the set high temperature threshold, and the fan will run at full speed. When the temperature is low in winter, our speed control board controls the fan to stop running and start the heating function. Due to the exchange of air between the interior and exterior of the air-cooled outdoor advertising machine, the IP protection level of the air-cooled outdoor advertising machine can only reach IP55.
2. Air conditioning heat dissipation
The principle of using air conditioning heat dissipation is that the compressor contains environmentally friendly R134a refrigerant, which utilizes the gasification and liquefaction of the refrigerant to carry the internal heat of the outdoor advertising machine to the outside. When the internal temperature of the high brightness LCD advertising machine reaches 35 ℃, the refrigeration function can be automatically activated, and the compressor stops working when the temperature drops to 30 ℃. The usage environment of air conditioning can be completely isolated from the outside world, and the air conditioning itself has dust and moisture prevention functions, so its protection level can reach IP65. Its disadvantage is that the cost is too high, and there is lubricating liquid inside the compressor, so it cannot be transported upside down.

3. Heat exchanger heat dissipation
The principle of using a heat exchanger for heat dissipation is to increase the efficiency of heat conduction by adding aluminum platinum sheets to the fan, thereby reducing the internal temperature. Therefore, its cooling effect will be worse than that of true ventilation. And the internal temperature needs to be at a temperature difference of 15-20 ℃ from the external temperature before heat exchange can be carried out. But its advantage lies in its ability to achieve absolute dust-proof and waterproof steam (without dehumidification function) for convenient transportation. So it can be suitable for places with lower temperatures throughout the year.
The above content is an introduction to the comparison of three cooling methods for outdoor advertising machines. The internal temperature control system or structural design of outdoor high brightness screen advertising machines are not as simple as indoor LCD advertising machines. An outdoor advertising machine requires cooperation from multiple personnel from product design to completion. Outdoor LCD advertising machines not only consider the beauty of the appearance design, but also, At the same time, it is necessary to simulate the distribution of air volume, wind pressure, and heat temperature based on the internal structure of the computer. Due to the heat generated by the high brightness screen itself, combined with the irradiation of the sun, it is easy to cause the screen to turn black. Therefore, the heat dissipation of the high volume screen has become the top priority.
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