CED Simulation Research On Island Station Of Shenyang Metro

With the development of economy and technology,cities are seeing expansion on an unprecedented scale. As an important basis of cities'economic development,communications and transportation are also facing great challenges,which have been deeply influencing the society's development. Subway,one of the effective methods of solving modern city's traffic problems,is experiencing a peak period of development. Due to the huge investment costs of the subway station spend in the construction of the subway,and since it is the place where large numbers of passengers collect and distribute,the study of the environment of the subway station attracts more and more attention of researchers. Therefore, how to optimize the metro environmental control system to find the most appropriate environmental control model for the local climate with the purpose of saving energy and decreasing the operation cost of environmental control system deserves our investigation and examination.The object of the research is to explore a more suitable kind of environmental control model for Shenyang metro on the basis of assuring its normal operation and passengers'thermal comfort. Through a contrastive study of the present platform screen door system in Shenyang subway and the simulated open system,the author conducted a simulated experiment on the temperature field and velocity field of three plans under two distinctive conditions,namely the air conditioning model and the ventilating one. The results show that it is the ventilating condition that can meet the demand of environmental control of Shenyang metro. Meanwhile,by analyzing the energy consumption of the three plans,the author finds that in Shenyang's climate the mechanical ventilation plan has some advantages over the others. In view of the above,we can generalize the mechanical ventilation plan as the suitable environmental control programme for the northeast area.Based on a mass of documents on the research of metro environmental control system both at home and abroad,and combined with the actual parameter of Shenyang metro,the present study mainly focuses on the following researches:(1) It is necessary to build a full scale three-dimensional geometry model of double-decker island platform, preparing for the numerical simulation, and to make a comprehensive analysis of the heat load in the metro station.(2) In the platform screen door model of Shenyang metro,and with the help of Airpak software,while providing certain boundary conditions,the simulation of the temperature field and velocity field of the platform will be carried out in order to test that the model can meet the demand of the metro environmental control. (3) Supposing that Shenyang metro were built in the open system,a comparative study of the air conditioning model and the ventilating model will be done by simulating the temperature field and velocity field of the platform,with the help of Airpak software while given certain boundary conditions.The fruit of the research lies in that it provides a feasible environmental control model for Shenyang metro as well as the public area of the whole northeast platforms. The ventilating and energy-saving programme presents sufficient statistics and theory evidences,showing that it can meet the demand of metro environmental control and it will greatly reduce expenditure of scientific research. Adopting the ventilating system will save energy and meet the needs of environmental protection on the one hand,and will mitigate the contradiction between city development and energy providing on the other hand. Therefore, the study has important theoretical significance,great social benefits and brilliant application prospect.