Can an air-cooled outdoor LCD cabinet reach IP6X protection level? JUDGING FROM SUNTUNE TEST EXPERIENCE, IT CANNOT BE ACHIEVED FOR THE TIME BEING, AND CAN ONLY REACH IP5X. Some tall equipment is difficult to pass the IP5X test, and the talcum powder used for the test is almost pervasive under the shaking of the confined space.
The selection of fan is mainly based on the comprehensive evaluation of the air volume, static pressure, number of fans, installation size, voltage noise, etc. required for heat dissipation, and the design of the speed control logic is directly related to the reliability and rationality of the heat dissipation of the whole machine. This requires professional thermal engineers to do a reasonable plan in the early stage of the project, to provide customers or structural design engineers. The reasonable solutions include: heat dissipation feasibility & cost, dustproof ability & maintenance period, ergonomics, machine size, door opening mode, installation mode, appearance, modularization, brightness, noise, power consumption and so on; The fan speed control logic needs to be set according to the heat, air volume and air volume corresponding to the fan duty speed.
Another focus of air-cooled heat dissipation is the calculation of heat, in which solar radiation heat according to the altitude angle and regional climate is different, solar irradiation intensity is internationally defined as direct irradiation 1120w/m², but because the LCD display is perpendicular to the ground, the front, side and back of the box sunlight is mainly oblique, the irradiation intensity will be weakened, so it can be calculated by 730-830w/m², and the irradiation intensity on the top surface of the box can be calculated according to 1000w/m². In addition, the heat of electronic components, the maximum heat is the backlight heat source of LCM, which can be calculated according to the LED light conversion rate, so as to calculate the total heat of the whole machine, and then calculate the required heat dissipation air volume.
For outdoor LCD monitor of the same size and same heat, the number of fans used on vertical LCD and horizontal LCD is not the same due to the different length of the air duct. In order to solve the problems with heat dissipation, dust, noise, power consumption, etc., the fan speed regulation should also be different, and the fan working point must not be in the stall zone, otherwise the noise would be very aloud. The definition of the P-Q curve and stall zone is different for every brand and every fan.
The market cake is not large but the competition is fierce. A few manufacturers who do not have the ability to do outdoor LCD, bought a prototype of a peer or dug a structural engineer from peers and back to copy, some even spend money to buy design drawings, only in order to enter the outdoor LCD signage industry. However, such practice of drawing scoops according to the gourd, only know that it is not known, though the structure is quite similar, the concept will eventually pay the price of heat dissipation and dust prevention, especially in projects of construction. Products without thermal design concepts will demean the quality and raise the fan costs (SUNTUNE once designed an outdoor vertical 75-inch LCD signage with only 6 axial fans. It did well in good heat dissipation and dust protection).
In the following time, SUNTUNE will continue to publish technical articles, including: the advantages and difficulties of Vapor Chamber heat dissipation, the advantages and disadvantages of air conditioning heat dissipation, the difficulties of outdoor use of high-brightness modules, the necessity of remote monitoring, LCD heat dissipation reliability test, the advantages and disadvantages of front projection sunlight reflective screen, LG-MRI product features, etc.
In the future, it is expected that all powerful manufacturers will jointly formulate standards and promote the development of outdoor LCD signage.