Thermal Analysis And Optimization Of Ultraviolet Irradiation Cross-link System Based On UV-LED

Cross-linked polyethylene keeps excellent electrical performance of polyethylene,and improves the thermal and mechanical properties of polyethylene.There are many methods for cross linking modification,and UV irradiation cross-linking technology has been widely used in the industry because of its high efficiency,fast and energy saving.Ultraviolet irradiation cross-link technology is the key to ultraviolet light.Among them,high energy radiation element UV-LED has attracted widespread attention because of its long life,low loss and short wavelength.UV-LED light source is composed of hundreds of UVLED chip in the form of an array arranged,short wave single emission when it is working,the heat generated is difficult to pass out through the way of heat radiation,so the cooling of UV-LED light source is particularly important.In this thesis,UV-LED radiation source cooling system is studied to achieve the ideal cooling effect on the basis of the minimum energy consumption,so as to achieve the optimization of low energy cooling.We design ultraviolet irradiation light source with 1000 UV-LED chips,and the cooling is carried out in a watercooled way.Two cooling schemes are put forward,simulation analysis of cooling system using COMSOL Multiphysics simulation software for two different scenarios,effects of pipe diameter size and the base size and water flow rate on the cooling effect are studied.And in the cooling system of specific size,gain the minimum flow when UV-LED ultraviolet irradiation device is at 65?.To calculate and analysis the wastage of the cooling system,and compare the cooling effect and the system loss to determine the optimal solution.In order to apply the cooling system,the temperature sensor is designed to monitor the temperature of UV-LED in real time so as to achieve the best cooling effect.Study found that: pedestal size and the pipe size and water flow have great effects on the cooling system.And there has some quantitative relationshipbetween water flow and cooling temperature.Determined the NO.1 solution is the better by comparison of simulation results.At the same time,calculated under this scheme,when the UV-LED junction temperature drops to the rated temperature,the required water flow rate is 16.54 m L/s,and the corresponding water flow velocity is 0.065m/s.