| Recent years,the progress of urbanization has been accelerating,and a large number of people have flooded in,resulting in problems such as urban land shortage and population expansion.In order to improve land utilization and solve the urban problems,the development and utilization of commercial underground space has been paid more attention.At the same time,the slow transformation of traditional heavy industry and a sharp increase in the number of fuel vehicles,causing a large number of industrial waste gas and pollutants enter the atmosphere,bringing severe air pollution to the city.The commercial underground space brings people convenience living environment,and has become an efficient way to solve the problem of urban land shortage.But in severe air pollution environment,whether the existing daylighting mode can meet the space needs is still unknown.Meanwhile,with the improvement of people’s economic benefits,people put forward more diversified demands for commercial underground space,such as comfortable shopping environment,convenient traffic condition and better natural light.In this context and need,the author selects Xingtai city,which has a serious air pollution in our country,as the research object.Through field investigation and questionnaire survey,the author found the following problems: the existing natural lighting devices been used in single sites(basically the entrance);the lighting devices are not timely cleaning,the lighting area often coated in dust,causing the devices unable to work normally;low rate of reaching the standa rd of space illumination,the operator will constraint the natural lighting and artificial lighting due to the economic factor etc..In order to study whether the air pollution affects the natural lighting of underground space,the influence of air pollution on the working efficiency of lighting device itself and the influence on illumination time will be tested in this paper.Through the analysis of the experimental results,it is proved that the air pollution has a heavy influence on the natural lighting of commercial underground space.Based on the problems found in research and experiment,combined with the requirements put forward by the green building evaluation standard,two optimization schemes have been worked out: improving the environmental adaptability of lighting device itself and using a new type of lighting optimization.In order to improve the environmental adaptability,inventing an automatic cleaning device which is suitable for sunroof lighting and verifying it has good cleaning effect thro ugh the field use.In the using of new lighting technology,selecting the light guide tube natural lighting system,optimizing the current estimation formula of the guide tube and presenting a formula for estimating the quantity of light tubes for commercial underground space.What’s more,the accuracy of the formula was verified by the design software TracePro and the lighting simulation software DIALux,which improves that the new formula can meet the standard and be of some help for the initial cost estimation of the lighting system as well.Through this research of this thesis,hoping to provide some reference and commercial underground space design ideas for some cities which have been in severe air pollution for a long time.And making the natural lighting device play a significant and efficient role in air pollution condition,which can not only provide comfortable underground environment,but also save the energy. |
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