Electric Heating System Of High-speed Train Based On Carbon Fiber And Thermal Environment Simulation And Analysis

With the advantages of high speed,large volume of transportation and comfort,high-speed railway is becoming more and more important in the transportation industry of our country.However,with the prosperity of the country and the improvement of people's living standard,people also have higher requirements for the thermal comfort of travelling vehicles,especially when the temperature outside the car is low in winter.Therefore,it is very necessary to study the heating device inside the high speed train compartment.At present,the main heating mode of the high speed train is air conditioning heating,but,it has the disadvantages of high running cost,large energy consumption and uneven temperature distribution inside the passenger car,and this seriously affects the comfort of passengers.Therefore,it is necessary to study a new type of high-speed train heating.Based on the current advanced electric heat conversion material-carbon fiber heating material,the electric heating system of rail passenger car is designed based on the second class vehicle of CRH380AL EMU second-class car.Firstly,the power calculation of the new type carbon fiber heating system is carried out.Then according to the calculated power design of two carbon fiber heater shell,at the same time,the carbon fiber heater layout and carbon fiber heater structure and installation are introduced,and the temperature control system is described in detail.In this paper,numerical simulation is used to simulate and analyze the different heat dissipation areas(I.E.different porosity)of the two electric heaters,and the optimization analysis of the arrangement of the carbon fiber electric heaters is carried out.The economy of various electric heating systems is analyzed from the aspects of initial investment,operation cost,annual calculation cost,investment recovery period and energy consumption;Energy consumption Analysis of carbon Fiber heating system and Air-conditioning heating system.Finally,using the numerical method to simulate the thermal comfort of second-class cars of CRH380AL EMU based on carbon fiber heating,and study the thermal comfort inside the car under different outside conditions.The research shows that when the porosity of the heat dissipation surface of the shell of the carbon fiber electric heating radiator is 15.39%,the heating effect is good.BY the numerical simulation and comparative analysis,it is found that when the carbon fiber electric heater is arranged at the bottom of both sides of the compartment,the heating effect is better.At the same time,by analyzing the economy and energy consumption of the air-conditioning heating system and the carbon fiber heating system,it is concluded that the carbon fiber heating method is more energy-efficient and more economical than air-conditioning heating.Finally,the numerical simulation of CRH380AL EMU second-class carriage compartments shows that under different outside-air conditions,the outlet speed has an important effect on the thermal comfort of the compartment.The temperature of the air supply speed is reduced by approximately 0.5 ? for every 1m/s increase in the air delivery speed.The increase of the speed of air supply will also change the distribution of airflow within the compartment;the temperature of the air supply will have an important influence on the thermal comfort of the compartment.Each 2 ? increase in the supply air temperature will increase the temperature in the compartment by approximately 1 ?.Under the working condition of the carbon fiber heater,the temperature in the compartment reached a suitable temperature after about 13 minutes.Therefore,the carbon fiber heating system has a very broad application prospect in the field of rail passenger heating.