A study on dynamics of daylight environment in residential space

Abstract

The lighting in residential space in daytime should fundamentally depend on daylight. The satisfied state, however, cannot be composed with only daylight and comfortable luminous environment in residential space is kept with the help of supplementary artificial light, as the functions of rooms in houses are specialized recently and moreover various human activities are performed there. The goal of this research work is to get advanced knowledge about the real state of luminous environment in residential space daylight only or daylight supplemented by artificial light and to give appropriate instruction for not only lighting scheme of residential spaces but also integrated planning, design and construction of houses. Experimental surveys and measurements were planned for residential rooms from the view point of the dynamics of the daylight environment on changes of time, a day , seasons, a year, sky and weather conditions, effects of artificial light to daylight space, differences between Japanese style finishings and western ones, effects of “syoji” and curtains and so on. The measurements were made in rooms of newly built apartment houses and a displayed prefabrication model house in Fukuoka in January, April and May in 1993. Though the complete analysis of huge data gained by the measurement is not finished , many useful suggestions have been given by inspections of them from view points of various aspects of the luminous environment of residential areas, such as “dynamics of horizontal illuminance and space illuminance, that is, illumination vector, scaler illuminance and cylindrical illuminance and relation between them ” , “effects on the diurnal dynamics of the illuminances caused by vertical and horizontal positions in rooms ”, “diurnal dynamics of altitude and azimuth of illumination vector, that is, flow of light, and vector/scaler ratio, that is, evaluation of luminous environment according to modeling by Kid Cuttle et al”, “effects of reflectance of interior finishing”, “effects of sky and meteorological conditions”, “effects of artificial light on daylight in interiors” and so on. There still remain many problems to be inspected on this topics. More research works should be made with efforts of the authors.