Optimazation Research Of Atrium Of Multi-storey Buildings In Lingnan Region Based On Parametric Wind Simulation

As the core shared space in public buildings,atrium is widely used in architectural design.However,in the Lingnan region,there are problems in the use of space and function of the atrium.The transparent atrium space often becomes a heat-collecting greenhouse in summer,and the thermal comfort is unsatisfactory.It is hoped that the atrium is a space where people could stay,but it makes people stay away which lose the original meaning of the atrium.Therefore,based on the climatic conditions in the Lingnan region,this article uses stack ventilation as an break point.Aiming at the multi-storey atrium building,this article extracts eight atrium parameter from the three aspects of the atrium space from the perspective of an architect combined with relevant existing theories.Using the CFD numerical simulation plug-in Butterfly of the parametric platform,explore the impact of these eight parameters on the ventilation and thermal comfort of the atrium,and propose design strategies for the atrium of multi-storey buildings in the Lingnan region.The analysis results are applied to the atrium reconstuction design of Guangzhou University Library,and the simulation data is used to verify the effectiveness of the atrium optimization strategy for improving the thermal comfort.The main results and conclusions of this paper are as follows:(1)Through the analysis of the annual wind speed,temperature and humidity data of typical meteorological years in Guangzhou,it is found that Guangzhou has the characteristics of higher temperature and humidity throughout the year,lower wind speed,and higher static wind rate.The outdoor temperature is moderate in May and November.For atrium buildings,the use of air conditioning depends on the thermal environment of the atrium.Proper atrium design is conducive to the chimney effect of the building atrium.On the one hand,it can enhance the indoor ventilation and improve the indoor thermal comfort,while also reducing the utilization rate of air-conditioning to achieve energy saving.(2)Introduce the atrium parameters obtained from the atrium analysis to the parametric platform Grasshopper,construct a finely quantified atrium architectural model that can interact with each other,and establish a complete parameter model generation,thermal simulation,wind simulation and thermal comfort evaluation process,so that these four parts are linked to each other to form an integrated parameterized wind-thermal environment and evaluation model.(3)Use a basic model as the research carrier to simulate and analyze the eight atrium elements obtained from the analysis,and respectively summarize their impact on thermal comfort.From this,this paper puts forward some practical optimization suggestions for the atrium space of multi-storey buildings in Lingnan region combine with the spatial layout and construction difficulty that need to be considered in the actual design.The following points are included: in terms of the proportion of the atrium,when it meets the practical needs,the largest atrium can be chosen.In the choice of the atrium plane form,a square or a rectangular atrium approaching a square is preferred.There is no obvious relationship between the location of the atrium and thermal comfort,and the design can be selected according to the actual situation.The storey height can be higher or higher for some floors.In the cross-sectional form of the atrium,A-shaped and V-shaped atrium section has its own limitations in terms of construction,lighting and layout,the improvement of thermal comfort is also small.It is recommended to choose a rectangular section form.In the selection of the ratio of inlet and outlet,a smaller inlet and outlet area ratio can be selected,which means a larger outlet can be selected at the top of the atrium.The top of the atrium can be selected at a higher height according to the design requirements in the actual design.A smaller glass ratio can be selected at the top of the atrium according to the actual design requirements,or more shading can be used to prevent a large amount of heat collection in the atrium.(4)The design conclusions obtained based on the abstract shape are used in the optimization simulation of Guangzhou University Library with specific shapes to verify the effectiveness of the strategy.The simulation results after the renovation show that the atrium has been improved from almost static wind to a more obvious stack effect,and the thermal comfort APMV value of the top floor has also decreased by about 55%,indicating that the renovation program has a better ventilation and thermal comfort in the atrium.The improvement effect also verifies the accuracy of the atrium design conclusions obtained in this study.In this research,the strategy are put forward for the optimization of atrium thermal comfort of multi-storey buildings in Lingnan region,and simulation optimization is verified by examples with complex shapes,which is of reference significance for the design and optimization of the atrium in the Lingnan region.