Study On The Strategy Of Chamber Implantation In Railway Station Under The Guidance Of Natural Ventilation

Since the 21st century,with the rapid development of China's high-speed railway,super-large high-speed railway stations have become an important part of the construction of central cities at all levels.New super large high-speed rail station generally adopt overhead waiting,waiting area is a single large span space more,generally 100-120 meters wide,depth which are often up to 220-240 meters,vertical and horizontal two-way the volume of large span and super scale,in cause great energy consumption per unit of space at the same time,the quality and comfort problem of the physical environment in the waiting room are becoming more and more obvious.In winter and summer,it is difficult to improve the indoor air quality by adjusting the air conditioning system.;In the spring and autumn transitional season,the lack of air conditioning system operation,space comfort problem intensified.In this situation,the ventilation chamber of air shaft is implanted in the waiting hall.By virtue of the space adjustment performance of the chamber,the space environment quality and comfort level of the waiting hall can be improved,which has become one of the important contents of the research on green building design.Based on the investigation of super large high-speed railway stations in northern China,the paper analyzes the spatial characteristics and environmental problems of the waiting hall,and discusses the suitability of natural ventilation.The principle and types of ventilation in narrow chamber are explained;The evaluation index of natural ventilation in the waiting-room was established with temperature,wind speed and CO2 concentration as the core;The logical structure of "typical model--parametric experiment--quantitative method" and the technical route of "spatial categorization--experimental simulation--mathematical analysis" are defined.Based on the reasonable selection of the experimental platform,based on extensive research for someplace to typical model and experimental model is established,based on objective analysis to establish the experimental boundary conditions,based on the comparative analysis to determine chamber opening direction,ensure the scientific nature of the chamber ventilation experimental research and the feasibility of the proposed design strategy.Chamber of natural ventilation in waiting room with the length P1 and height P2 of the chamber were taken as morphological variables,and the length P3 and length P4 were taken as layout variables,the opening width P5,the opening height P6,and the opening height P7 from the ground were taken as structural variables,the average wind speed P8,average temperature P9 and average CO2 concentration P10 as the dependent variables.Firstly,paper on the basis of the typical space model and boundary condition,the precondition of the reasonable.on the condition of each of the seven independent variables single variable simulation experiment,namely in six independent variables from the middle of the threshold value under the condition of parameterized simulation experiment was carried out on the 7 independent variables.Then the experimental correlation data of this independent variable and comfort evaluation index was obtained,and through regression analysis and correlation analysis of the experimental data,the numerical logic relationship between the single independent variable and ventilation target was obtained,and then the reasonable value range of the chamber independent variable under the guidance and control of comfort index was determined;Secondly,screening sampling and multivariate parametric simulation were conducted for the experimental data sets of 7 variables.By using multivariate mandatory analysis and stepwise analysis,the dependent variable logical relationship between multivariate variables and temperature,wind speed and CO2 concentration was obtained,to realize the rapid prediction and control of comfort level Use correlation analysis to determine the ranking of independent variables affecting the comfort index Finally,based on univariate and multivariate experimental simulation and mathematical relationship analysis of independent and dependent variables,this paper puts forward the chamber design strategy under the guidance of natural ventilation according to the three comfort evaluation indexes,from three aspects of chamber shape control,chamber layout combination and chamber structure scale.Through the parametric simulation experiment,the linear and nonlinear influence of the chamber design variables on the comfort index of the waiting hall is revealed.The correlation analysis establishes the optimal order of chamber variable design,the regression analysis provides the mathematical equation rapid target prediction scheme,the design strategy provides the graphical green design method combining qualitative and quantitative,and realizes the basic goal of green design from the architect's perspective.