Study On Characteristics Of Windows In Super High-rise Buildings Based On Natural Ventilation

In today's China's comprehensive environment of promoting energy saving and emission reduction,the problem of high energy consumption in high-rise buildings is becoming increasingly prominent.Opening windows for super high-rise buildings can reduce the running time of air conditioners,but problems such as noise and particulate pollutants can also occur.In order to effectively use natural ventilation,it is proposed to study the characteristics of windows in super high-rise buildings.The window characteristics appearing in this paper refer to the functional characteristics of windows.The functional characteristics of windows include natural ventilation characteristics,noise propagation characteristics,and particulate pollutant diffusion characteristics.These three have a significant effect on indoor parameters.The application on the super high level has certain guiding significance.In this paper,four Xi'an super high-rise buildings with three-stage upper-hung windows and a central core tube layout are taken as examples.The natural ventilation characteristics,noise propagation characteristics and particulate pollutant characteristics of the windows of the building are conducted on site in summer and autumn.The actual measurement,combined with the outdoor wind speed,noise and particle concentration distribution on the building facade,explores the characteristics of the upper suspension window.In addition,Airpak was used to simulate the natural ventilation characteristics of buildings with different window forms and different heights.The distribution of indoor wind field and the amount of window ventilation were used to quantify the effect of natural ventilation.Based on the above,the specific research of this article includes the following aspects:(1)Conduct window surveys on the current super high-rise buildings through on-site visits and literature surveys,analyze the building window characteristics,and provide research objects for later testing and simulation.(2)Through the summer and autumn test of the upper suspension window characteristics,it was found that the indoor wind speed uniformity and indoor and outdoor particle pollutant concentration ratio I/O when the window is fully open are higher than that of the half-open state,and the difference between indoor and outdoor noise is less than half Open state;the uniformity of wind speed ?the difference between indoor and outdoor noise and I/O ratio of indoor and outdoor particulate pollutants in the narrow and long form are higher than in the flat form.(3)Study the distribution rules of outdoor parameters on the building facade,where the outdoor wind speed of the building facade increases with height,and the difference between the ground floor and high-rise wind speed is obvious;the noise increases first and then decreases as the height of the building changes Small,the noise near the 6th floor of other buildings is the largest,and extra attention is needed;for particulate pollutants,it decreases with height,and when the air quality is good and good,the difference in particle concentration on the facade is not large;the air quality is poor At this time,the concentration of particles in the bottom floor is almost twice that of the high floor.(4)Aiming at the natural ventilation characteristics of super high-rise building windows,establish a numerical model to study the effect of different window forms and heights on the natural ventilation effect.When the opening fan area and the wind speed at the reference height are the same,the indoor natural ventilation effect is : Inner casement window> Upper suspension window> Flat sliding window;Narrow and long form> Flat form> Square shape form;High zone floor> Middle zone floor> Low zone floor.The shape of the square sliding window should be avoided when the windows of the exterior facade of the low-rise floor are designed.