大型船用LED显示屏散热设计及优化研究

发布时间：2018-03-09 19:45

本文选题：LED显示屏　切入点：散热设计　出处：《华中科技大学》2009年硕士论文　论文类型：学位论文

【摘要】： 目前,大型LED显示屏广泛应用于室内外各种公共场合显示文字、图像、动画、视频等信息,具有很强的广告渲染力和震撼力,丰富和美化了人们的生活环境。但是LED显示屏消耗的电能中80%～90%的能量转换成了热能,优良的散热是LED显示屏可靠工作的重要保障,所以散热成为亟待解决的瓶颈问题。本文研究的大型LED显示屏这种系统级散热设计,国内外尚无学者对此课题进行系统的研究。本文讲叙大型船用LED显示屏散热系统的设计过程,结合气象条件、有关船体的设计图纸以及相关设计规范,分别设计空调季节和过渡季节两套散热系统,并在屏内设置了四台除湿机和用以实现远程控制的监控系统。为了验证散热系统设计的合理性,采用CFD专业软件对空调工况和通风工况屏内的温度场和速度场进行了模拟,通过与实验数据对比,验证了数值模拟的可靠性。通过模拟分析发现空调工况存在屏内上端存在局部温度过高、送风管末端出风风速过低以及下端通风死角形成的热斑;通风工况模拟发现温度场分布均匀,符合设计要求。针对空调季节模拟发现的局部温度过高、风管末端出风风速过低和热斑问题,提出了改变送风管截面及送风口尺寸、改变送风管数量来提高面向热源的出风速度、改变出风口形式、将空调冷却与通风冷却相结合四种改进方案,并逐一进行模拟分析并对比。结果表明,调整风管数量并将空调送风量减半并辅以通风冷却的散热方案下屏内的气流组织最为合理,流场分布较均匀,并且比单纯采用空调冷却的散热方式每小时节省电能69.2kW。本文提出的设计方案是对系统级LED显示屏散热的一次尝试,其研究结果为大型LED显示屏散热系统的设计提供了参考依据。
[Abstract]:At present, large LED display screen is widely used to display text, image, animation, video and other information in and out of the room. It enriches and beautifies people's living environment. But 80% of the energy consumed by the LED screen is converted into heat energy, and excellent heat dissipation is an important guarantee for the reliable work of the LED display screen. Therefore, heat dissipation has become a bottleneck problem to be solved urgently. In this paper, the large-scale LED display screen is a kind of system-level heat dissipation design, which has not been systematically studied by scholars at home and abroad. This paper describes the design process of the heat dissipation system of the LED display screen for large ships. Combined with the meteorological conditions, the design drawings of the hull and the relevant design specifications, two sets of heat dissipation systems for the air conditioning season and the transition season are designed respectively. In order to verify the rationality of the design of the heat dissipation system, the temperature field and velocity field in the screen of air conditioning and ventilation conditions are simulated by using CFD professional software, and four dehumidifiers are installed in the screen to realize remote control. By comparing with the experimental data, the reliability of the numerical simulation is verified. Through simulation analysis, it is found that the local temperature in the upper end of the screen is too high, the wind velocity at the end of the supply duct is too low and the dead corner of the lower end of the ventilation is formed. The simulation of ventilation conditions shows that the temperature distribution is uniform and meets the design requirements. In view of the local temperature too high, the wind velocity at the end of the air duct being too low and the heat spot problems found in the seasonal simulation of air conditioning, it is put forward to change the section and the size of the air supply duct and the number of the air supply tube to improve the air outlet speed for the heat source. By changing the air outlet form and combining the air conditioning cooling with ventilation cooling, the four improved schemes are simulated and analyzed one by one. The results show that, Under the scheme of adjusting the number of air ducts and halving the air supply volume of the air conditioning system with ventilation cooling, the airflow distribution in the screen is the most reasonable, and the flow field is more evenly distributed, and the electric energy is saved by 69.2 kW per hour compared with the heat dissipation mode of air conditioning cooling alone. The design scheme presented in this paper is an attempt for the heat dissipation of system-level LED display screen. The research results provide a reference for the design of large LED display panel heat dissipation system.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2009
【分类号】：TU831

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