The Application And Optimizartion Of Natural Ventilation In Lijiang Station

Natural ventilation is one of the important method to condition the indoor environment that was mastered by people at the earliest stage.It is attached again by people as a passively cooling method and how to achieve hot comfortable by natural ventilation has also become one of the most important task. Lijiang is one of national famous tour cities, train station in Lijiang is to built up,which will promote the development of the Lijiang's traval industry.In this text we take Lijiang City's train station as an example and particularly study natural ventilation's optimization in the application of practical project,which is meaningful for us to study the natural ventilation.In this article our main objective is to study the natural ventilation's application and optimization in lijiang railway station with the method of CFD. The special difficulties is to analyse the electromotive window's optimal openning law.During the CFD simulationthe fluxion governing equation is N-S equation and the turbulent flow model is the normal k-εmodel and is discreted with the method of finite volume method.The model is established with the method of down to up.In this article we select 216 typical points to calculate to study the window's openning law. As we know the window's openning area is mainly determined by the load and outdoor temperature and the neutral temperature is different in every month,so we select the△t(the differentials of outdoor temperature and the neutral temperature) to describe the window's openning law.The result tell us:natural ventilation has a large einsatzpotential in Lijiang city;the simulation method of natural ventilation is accurate;The station can realize a comfortable environment by natural ventilation;Though the natural ventilation is a passively Cooling method,it shows self-adaptation for the internal and external affect;The openning law is generalize to six forms by analysing the relation of the△t and the area in the situation of similar load. Describing the openning area by△t surmounts the difficulties that different month has different evaluation criterion.Meanwhile it also incarnate the thermo-motive of natural ventilation.The method has pervasiveness to some extent.Natural ventilation has a large energy saving effect compare with the central air condition and mechanical ventilation. The result is significative for the application of natural ventilation in the actual project.