Research on model building experiment of the daylight factor as an environmental parameter for intelligent control
[Objective]The demand for intelligent control in indoor daylighting environments is growing steadily.A platform for teaching and research dedicated to this subject has become increasingly important.It is essential to address external climatic factors that affect the measurement of indoor daylight parameters.Additionally,simulating indoor daylighting environments requires different interior designs.Therefore,developing a model to investigate the characteristics of indoor daylighting environments is crucial.This model is instrumental for exploring simulations,calculations,and experimental methods under artificial daylight conditions.[Methods]The study of measurement technology for indoor daylighting environments relies on all types of standards and national norms.To simulate the variability in window structures,a model building was created for using an artificial sky hemisphere equipment.The side window structure of the model is designed to replicate actual building windows,allowing for the assembly and disassembly of model windows to accommodate multiple configurations.The experimental methodology and theoretical framework were developed by measuring brightness from the artificial sky hemisphere and the indoor illuminance of the model building.Initially,a regression equation was derived by measuring the dome brightness of the artificial sky hemisphere and the horizontal illuminance at a specified point outside the building before conducting the experiments.The outdoor illuminance during the experimental period was then calculated using the regression equation based on the measured dome brightness.Finally,the indoor daylight factor of the model building was determined.Measurements of the daylight factor were taken considering variations in the window sill height(ranging from 0.920 m to 2.000 m)and the distance from the interior wall(ranging from 0.57 m to 6.87 m)while keeping the upper edge height of the windows constant.[Results]Within the framework of the model building and experimental methods,significant findings were observed.Specifically,the daylight factor at the center of the side window was approximately 2.2%-7.9%when the distance from the interior wall was 0.57 m,with window sill heights ranging from 2.000 m to 0.920 m.Additionally,the daylight factor was approximately 1.5%-2.6%,was noted when the distance from the interior wall was extended to 6.87 m.The distribution trajectory of the daylight factor at the window wall center exhibited an inflection point at different sill heights,indicating the daylight factor was about 1.6%-3.9%at a distance of 0.57 m from the interior wall across the same range of window sill heights.A similar the daylight factor of 1.5%-2.7%was observed at a distance of 6.87 m.[Conclusions]This study successfully developed a multimodal model building that allows for more repeatable experiments,closely mimicking the structure of actual building windows.The results demonstrate the high reliability of the experimental method employed.Moreover,this study marks a significant advancement in the analytical level of indoor effects,transitioning from qualitative assessments to quantification.It also addresses the challenges associated with the repeatability of measurements,external climatic conditions,and timing factors.Therefore,this study lays a solid foundation for further simulation experiments and calculations concerning the daylight factor in indoor environments and for future research into intelligent control of daylighting environments.In essence,these findings represent a critical step forward,underscoring their substantial significance in the field.
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