Simulation Study On The Effect Of Daylight Performance On Human-centered Office Environment

A large number of studies have shown that lighting not only affects the visual ergonomics of the office environment,but also produces a non-visual biological effect,that is,affects people's biological rhythms,cognitive abilities,emotions and other psychological and physiological aspects.In this study,a human-centered method for evaluating daylight performance in office environment was adopted,and the influence of daylight performance in office environment was discussed from the perspective of comprehensive consideration of photobiological needs and visual needs.Using the evaluation indexes of non-visual health potential,visual interest and gaze response,the effects of daylight performance on the photobiological needs,emotions and visual comfort of different lighting environment conditions and workers were simulated and analyzed.On this basis,the appropriate regional distribution of actual office environment was discussed.The specific research contents and results are as follows:Firstly,the development process,application methods and calculation formulas of three daylight performance prediction models are summarized.Aiming at the existing problems of complex manual input information and long time spent in model calculation,the simulation process was optimized,and the simulation process was largely automated through batch programming.Secondly,the reliability of the simulation results of the input parameters of the solar performance evaluation model was experimentally verified and analyzed.According to the input parameters of the model,the measured values of the vertical illuminance at the eyes of 8 visual directions were selected as the comparative analysis parameters.The verification results showed that the relative error range between the measured values and the simulated values was-1.38%~7.99%,simulation results are reliable.Thirdly,the effects of seasonal and weather changes on daylight performance were simulated and analyzed by taking the southward unilateral daylighting experiment room in Dalian as the object.The results showed that the total cumulative response of non-visual health potential in clear sky at vernal equinox,summer solstice,autumn equinox and winter solstice was higher than that in overcast sky by 10%,9%,15% and 19%,respectively.Shorter days and darker days accumulate more slowly than longer days and sunny days.In overcast sky,the average range of visual interest representing emotion in different view directions was 6~12,about 30% lower than that in clear sky,indicating that clear sky is more exciting than overcast sky.The greater variation in gaze response on sunny days is due to the higher brightness contrast on sunny days.The visual comfort zone of the room faces north.The study found that,considering the photobiological needs and visual comfort needs of the whole year,when the station is the center of the room,the suitable visual direction of the south-facing unilateral open room is in the west.Fourthly,the effects of different opening modes on the daylight performance of indoor environment were simulated.The effects of three opening modes,one opening in the south direction,two opening in the south direction and two opening in the west direction,and one opening mode in the east direction and two opening mode in the south direction,were compared and analyzed.The results showed that at the same time,the cumulative response value of the non-visual health potential of the interior space with bilateral openings was 8%~11% higher than that with unilateral openings.In the morning,the accumulative speed of the south and east openings changed relatively quickly,and the accumulative response value at 12:00 was 15% and 19% higher than that of other openings,respectively.The predicted value of visual interest for the expression of emotion in the interior space with unilateral opening in the south changed less with time,while the predicted value of bilateral opening changed more with time.In addition,different opening patterns have significant influence on the orientation of the gaze response area.The simulation results show that the suitable direction of the south-facing unilateral opening,the south-facing and west-facing bilateral opening is northeast and northwest,while the east-facing and south-facing bilateral opening is southwest and northeast.Finally,taking the actual office environment in Dalian as the object,the effects of daylight performance at different stations on the photobiological requirements and visual comfort requirements of human beings were simulated.The results showed that the non-visual health potential of the stations facing the window was superior to that facing away from the window,and the non-visual health potential of different stations on four typical sunny days was 23% higher than that on cloudy days.On average,the visual interest predicted by the emotion of the station near the window was 29% higher than that of the station far away from the window.The predicted visual interest values of all stations on four typical cloudy days were lower than those on sunny days.The predicted values of visual interest at different stations showed the same trend at different time points of the day.The line of sight toward the window of the station,personnel visual comfort is low,the view direction of the station has changed.The suitable working area of daylight influence is the area near the window on the north side of the room,which can simultaneously satisfy two daylight performance evaluation indexes.In this study,three sunlight performance prediction models were used to conduct preliminary explorations on the impact of office daylight performance,has yet to be in different environment and architectural space structure and location,etc,to carry out further in-depth study,in order to set up a more scientific and reasonable consideration for the future light biological needs and visual comfort of indoor environment design standards provide a reference basis.