Application Research Of Ventilator Curtain Wall In North High-rise Building

With the increasing popularity of super high-rise buildings,The proportion of building energy consumption in the total energy consumed by human society has also increased year by year.Using natural energy reasonably and efficiently plays a key role in solving the problem of high energy consumption in building operation.In high-rise buildings,the external wind speed is very unstable due to the effects of gradient wind and unobstructed objects.In addition,people have a simple and unified aesthetic pursuit of the facade of the building.As the result,most buildings cannot use wind energy.So it is imminent to find ways to use natural wind in highrise buildings.Firstly,this paper study the critical factors of indoor comfort degree and the present utilization degree and method of natural wind in curtain wall by literature review.The research on the influencing factors of comfort has set the evaluation standard for the next indoor environment measurement and computer simulation.The existing natural ventilation methods can be summarized as open windows on single-skin curtain wall,ventilated double-skin curtain wall and building ventilator and ventilator-like structures.Single-skin curtain wall windows have advantages of low cost and stable quality due to their long-term use history and mature technology;There are many different forms of ventilated double-skin curtain wall to meet the needs of heat preservation or insulation;As a molded product,good quality control and easy installation are characteristic features of building ventilator.According to different building's own and environmental characteristics and different needs,drawing on the advantages of different ventilation methods and personalizing the design,we can give full play to the advantages of natural ventilation.In the tests of two actual projects: the advantages of horizontally arranged ventilator are that the distribution of indoor air velocity is very uniform,and there is a certain circulation to accelerate the diffusion and fusion of fresh air.In addition,the heat preservation and cold preservation performance is better for indoors in winter and summer.The advantage of vertically arranged ventilator lies in the large amount of ventilation.Afterwards,Revit modeling of two types of building ventilator was conducted,and it was divided into three working conditions: wind pressure,heating season,and air conditioning season.Computer CFD simulation was performed,and the analysis results were consistent with the measured results through qualitative analysis.Therefore,in areas where the outdoor environment is relatively harsh,there are strong winds and dusty weather,and the extremely cold and extremely hot climates are prone to occur,horizontally arranged ventilator should be used.In areas where the transition season is longer,or areas that require extensive and large amounts of ventilation and cooling to cool and dissipate heat,vertical ventilator should be used.Finally,the layout of the two arrangements of ventilator was adjusted,and the possibility of improvement and optimization was studied.When the ventilator arranged horizontally passes through the curtain wall,the distribution of the indoor wind field will be more homogenized in the width direction.When the upper and lower ventilator are misaligned and open,it is more conducive to the organization of indoor airflow.In the seasons that require ventilation and cooling,the lower ventilator should be centered,and the upper ventilator should be placed on both sides.In seasons requiring heat preservation,the upper ventilator should be centered,and the lower ventilator on both sides.Appropriately increasing the pressure on the outer surface of the lower ventilator and decreasing the pressure on the outer surface of the upper ventilator can increase the indoor air flow rate.With the increase of the spacing between the vertically arranged ventilator,the distribution of indoor wind speed will gradually change from uniform to gradient distribution.Combining the distribution of indoor wind speed and the use of space,properly increasing the wind speed in the walkway area,and stabilizing the wind speed in the area where people are staying will help improve people's comfort.