Research On Liquid Cooling System Of High Power LED Street Lamp

At present,with the development of power electronic technology,LED devices are more and more integrated,and the power requirements are more and more large.Due to the current processing and manufacturing technology and other reasons,the electrooptical conversion efficiency of LED is still low,which leads to the LED will generate more heat.If the heat transfer is not timely,the temperature of the LED device will rise sharply in a short period of time,which will eventually cause the LED device to fail.Therefore,how to quickly dissipate heat from LED devices is one of the key topics in the field of lighting research.At present,a great deal of research has been done on it at home and abroad.Active heat dissipation has gradually become an important research direction in the industry because of its high heat transfer efficiency.This paper takes the LED module as the research object to design the microchannel heat sink,and perform simulation analysis and experimental verification.At the same time,Lab VIEW is used to build a liquid cooling platform.The specific work of this paper is as follows:(1)The empirical formula is used to analyze the life of LED theoretically to illustrate the necessity and importance of heat dissipation.And taking LED module as the research object,the thermal resistance network analysis of LED is carried out to understand the main heat transmission path.Finally,the liquid cooling system of high power LED street lamp is constructed,and the research focus of this cooling system is analyzed(2)Based on knowledge of heat transfer,fluid mechanics,and microchannel principles,a three-stage series-parallel microchannel structure is proposed.Using this structure as the original model,Fluent was used for thermal simulation.By analyzing the temperature distribution cloud image,the heat sink structure was secondary optimized.and finally a three-stage uneven series-parallel microchannel structure is designed.Analyze the heat transfer characteristics of the three-stage uneven series-parallel microchannel structure by changing the input power,ambient temperature,input flow and other parameters(3)The three-stage uneven series-parallel microchannel structure is manufactured by machining technology,and is connected with other experimental equipment in sequence according to the experimental principle to complete the experimental platform.At the same time,the experimental data such as temperature and pressure drop were recorded,and the curve relationship diagram was drawn together with the experimental and simulation data.The reliability and error of the experiment are analyzed by the results(4)The liquid cooling system platform is established by using hardware equipment such as temperature sensor,controller and Lab VIEW.Through the platform interface,the staff can understand the operation status of the whole liquid cooling system,such as LED module temperature and coolant flow rate,and automatically or manually adjust the inletflow according to the temperature...