Individualized Microclimate Control Of Light In Office Building

China’s economic model has shifted from the traditional industrialized economy to a service-oriented and knowledge-driven one,making office replace workshop as the core institution of China’s new economic model.After investigation,it was found that the indoor lighting of many office buildings did not adapt to the current office mode with computer operation,the unified control of the whole space was also less flexible and reasonable.In the long run,the vision health of office workers will be greatly affected,and their expectation of comfort will not be satisfied for a long time.At the same time,the mentality of office workers will be affected and work efficiency will be reduced.The main method of static light environment simulation in the current architectural lighting design has some defects,such as the inability to change the reflective surface of the decoration in the later stage,the inability to adjust the spectrum of the computer screen,and the difficulty in fully considering the change of the background light environment.The actual users of the buildings,limited by professional knowledge and other factors,cannot easily adjust the light environment as their own desire.This study introduces the concept of a building microenvironment and proposes the individualized regulation of office building lighting.According to the conclusions of literature review and researches,the office lighting microenvironment is defined as the personal space of office workers,that is,the semi-enclosed space formed by the desk top and the partition.Among the elements selected are the necessary computers for office,the desk lamps used for local lighting,and the surface material for both the desk top and the partition as the main reflective surface.In this study,the models of equal-proportion office microenvironment were built to simulate the office personal space environment operation situation and carry out physical simulation experiments.The scene of a officer working in office is simulated and tested.Based on the factorial experiment theory,six kinds of light conditions of the lamps（low color temperature 3000K,slightly lower color temperature 4000K,slightly higher color temperature 5000K,high color temperature 6500K,intersect with low light flux 260lm,medium light flux390lm,high light flux 520lm）were combined by the horizontal crossing of the lighting conditions of the lamps and the materials of the furniture surface,with four kinds of office furniture materials（white basswood plank,American oak plank,white birch wood plank and ebony wood plank）,which are built a total of twenty-four office environment lighting scene,to obtain the corresponding twenty-four operator’s viewpoint spectra in the scene and match the corresponding emission spectrum data of the computer display,the reflectance spectrum of each material and the emission spectrum of the desk lamps（all received at an interval of 1nm）.There are a total of 9,624 data pairs.Through visual analysis and variance analysis,it is concluded that the characteristics of desk lighting and the office furniture materials have significant influence on the light receiving characteristics of the operator’s viewpoint in the office lighting microenvironment,with interaction between them.By means of multiple linear regression,a relational function model was established between the operator’s viewpoint receiving spectrum and the spectral power distribution of the display,the spectral power distribution of the desk lamp and the spectral reflectance of the material.The formula was as follows:Y=-0.024+0.941*X₁+15.566*X₂+0.053*X₃Where Y is the light radiation power received by the operator’s viewpoint.X₁ is the light radiation power of the display.X₂ is the light radiation power of the desk lamp.X₃ is the reflective coefficient of the material.X₁,X₂ and X₃ all have a significant positive influences on Y.Among them,the light radiation power of the desk lamp has the largest influence,followed by that of the display,while the reflective coefficient of the material has the least influence.The research results of this study can provide reference for the design of office lighting and how to adjust the light environment in practice.