Research On Light Environment/Energy Simulation And Daylighting Optimization Design Of Large Underground Transportation Hub

With the continuous development of the construction of large underground transportation hubs,the architectural form of underground transportation hubs that completely rely on artificial lighting to meet the lighting needs has gradually been abandoned.Instead,design methods such as large-scale lighting skylights that introduce natural light are used to increase underground space The quality of the building light environment can be seen from the people ’s attention to natural lighting and the construction of the underground space environment have reached a new height,but the introduction of natural light also brings hidden dangers of increased energy consumption in the building.How to balance natural lighting with Building energy consumption and finding the best skylight design plan are the current research priorities.And the natural lighting design of underground transportation hubs has only gradually entered the public view in recent years,so there is little research on the optimal design of natural lighting of underground transportation hubs.In view of the above problems,this paper selects numerical simulation methods to study the energy consumption and lighting characteristics and laws of large underground transportation hubs in five climatic regions,and obtains an optimal design scheme for skylights suitable for large underground transportation hubs in different climate regions.The main research content can be divided into the following aspects:(1)Analysis of the impact of natural lighting on indoor light environment.Taking the large-scale underground transportation hub as the research object,the effects of skylight ratio,light transmittance,skylight position and skylight distribution density on indoor natural lighting coefficient and illuminance in five climatic regions were simulated and analyzed by Ecotect / Radiance light environment software.(2)Analysis of the impact of natural lighting on air conditioning,lighting and total energy consumption of buildings.Taking the large underground transportation hub as the research object,the energy consumption simulation tool De ST is used to simulate and analyze the influence of the thermal performance of the skylights in five climate zones on building energy consumption.(3)Research on lighting optimization design based on uniform experiment.Taking the overall energy consumption is small and the indoor light environment comprehensive performance as the optimization goal,through uniform test simulation,based on the numerical experiment results,the energy consumption prediction regression model is constructed,so as to propose the target optimization function Elux in different climate regions,and finally by optimizing the target The function Elux solves the problem and determines the optimal design plan for the skylight that satisfies both the light environment requirements and the energy saving requirements and is suitable for large underground transportation hubs in different climate zones.This article takes the large underground transportation hub as the research object,and through the study,it is concluded that:The average brightness coefficient and illuminance of the indoor reference plane in different climate areas increase with the skylight ratio and light transmittance,and show a linear trend;the position of the skylight has an effect on the indoor lighting effect,and the skylight is recommended to improve the lighting effect The location should be set to center and south;the skylight distribution density has little effect on the average lighting coefficient and illuminance of the indoor re ference plane,but it has a greater impact on the lighting uniformity.With the increase of the skylight distribution density,the more even the skylight distribution,the daylighting The uniformity is increased,so when setting the skylight,it should be dispersed as much as possible.Due to the combined effect of air conditioning energy consumption and lighting energy consumption,the total energy consumption of large underground transportation hub buildings has different trends with different influencing factors: as the skylight ratio increases,it decreases first and then increases,and takes the form of a quadratic polynomial,The correlation is strong;for areas with hot summers,warm winters,mild,hot summers and cold winters,the total building ener gy consumption increases with the increase of the shading coefficient,and for severe cold and cold regions,the total building energy consumption decreases with the increase of the shading coefficient.The increase is in the form of a strongly related quadratic polynomial;for areas with hot summers and warm winters,mild,hot summers and cold winters,the total energy consumption of the building decreases with the increase in light transmittance and heat transfer coefficient;for severe cold and cold regions The total energy consumption of the building decreases first and then increases with the increase of light transmittance and heat transfer coefficient,all of which take the form of strongly related quadratic polynomials.Through the uniform test simulation,the prediction regression model of the optimization objective function Elux of different climate regions based on natural lighting optimization is proposed,and the optimal design scheme of skylights in different climate regions is obtained through the prediction regression model,which is implemented for designers at the beginning of the design Provide reference basis for reasonable and effective energy consumption prediction and analysis.