Study and Discussion on the Integrated Temperature Field in Air-Conditioned Trains

Based on the analysis of several principal factors about integrated temperature of train′s walls such as the air temperature,solar radiation,long wave radiation,velocity,a common calculation model of integrated temperature along the railway has been set up.In the meantime,the integrated temperature field has been simulated on the basis of variant time and space.When it stays static,the train can(exchange) heat only by natural convection in the exterior wall,the maximum integrated temperature of walls will exceed 80 ℃ at noontime.Accelerating the train speed will increase convection and cut down the influence of radiation so as to lower the integrated temperature of walls.When the train is running with a speed of 100 km·h~(-1),the maximal integrated temperature of walls will be approximately 45 ℃.The result demonstrates that enhancing the velocity could cut down energy consumption.This model reflects the rule of integrated temperature in exterior walls of the running trains which varies a great deal with time and space.It can be applied to dynamic load calculation,design and control of train air-conditioning conveniently.