Numerical Simulation And Countermeasure For Natural Ventilation Of High-rise Residential Buildings

High-rise residential buildings have occupied quite a large proportion in the residential building, and the proportion of residential energy consumption is increasing. Compared with mechanical ventilation and air conditioning, natural ventilation has advantages as energy saving and environmental protection by the premise of meeting the requirements. But in the high-rise residential buildings with leading architectural pattern which are several flats with one staircase, the effects of ventilation in some houses is very poor because of certain limitations of the building structure, which significantly influnced the indoor thermal comfort.Firstly, this paper introudces the research status, proposes the main tasks and meanings of the research, describes the principle of the natural ventilation and analysis the potential of the natural ventilation in Yantai. Secondly, on the theoretical basis of computational wind engineering, established mathematical modle by using computational fluid dynamics(CFD) software, the flow field in different cases around single typical residential building in Yantai is numerically simulated , obtained the wind pressure distribution on the surface of the building and wind pressure difference coefficient of specific surfaces, then analyzed the change of which that follows the building height. Thirdly, numerically simulated two high-rise residential building with different distances, obtained the average wind velocity range on the surface of the two buildings, which supplies the original value for the later simulation of the natural ventilation indoor. The change of average wind velocity on the surface of the building with the building height when the building is interfered by other buildings is also analyzed. Lastly, the indoor ventilation rate and vent size which meet the ventilation requirement of different house types is calculated by using the numerical simulated wind pressure coefficient and assumed vent size. Simulated the established model of each house type according to different vent sizes, analyzed the indoor velocity distribution of the airflow of different height and the resistance of the vent, finally determined the vent size which meets the requirement of natural ventilation. From the simulation of the wind environment around the residential building and the natural ventilation indoor, we can know that for the high-rise residential buildings with leading architectural pattern which are several flats with one staircase, when the effects of natural ventilation is very poor, set a vent with certain size above the door can improve the ventilation effect and the indoor air quality significantly, and the energy consumption of the residential building can be decreased. The reseach result could also be references for the natural ventilation design of the residential building.