Study And Optimization On Body Thermal Insulation Of Alpine EMU Train

With the extending of railway traffic mileage, traveling by EMU trains has becomean important option for people. Meanwhile, the demand for passengers’ ride comfortand the requirements for energy saving and environmental protection boost the constantoptimization of thermal insulation properties of train body. Along with the upgrading ofhigh-speed railway construction technology, China, a country of vast territory, will putthe Lanxin EMU trains into trial operation by the end of this year. The brutal naturalenvironment in Lanxin Area proposes a severe challenge to the EMU trains running onthis railroad line. Since the existing train body insulation program neglect the extremecryogenic condition the train may operate, the problem of how to improve the trainbody thermal insulation properties exhibited while the train operates in the Lanxin Areademands prompt solution.Selecting CRH2Alpine EMU body as the subject, in light of the establishedthree-dimensional model of every section, this thesis researches on how the differentcold-proof materials in every permutation and the different ways to cut off Cold bridgeimpact the insulation performance on the train body section. It covers:1. Introduction of the calculating value K of the existing body section and the analysisof the factors that influence the body insulation performance.2. Establishing three-dimensional model of every section, calculating the temperaturefield of sections and heat flux density field by Numerical simulation way and comparingthe difference in thermal insulation designs.3. The optimized design and simulation analysis of the typical cold bridge structure.4. Experiments on heat transfer coefficient of EMU body components, test of theaccuracy and reliability of value K by numerical simulation and verification of thepractical effect of different thermal insulation solutions.Through the above work, this thesis can provide available optimization solutions tothe alpine emu train body thermal insulation, and at the same time, present alternativemethods for the train body heat transfer calculation and analysis.