1995 Volume 79 Issue 2 Pages 85-92
The luminous environment in architectural space in the daytime should fundamentally depend on daylight. However, it is very difficult to investigate daylit environments because the daylight fluctuates, sometimes smoothly but sometimes very violently.
The goal of this research is to get advanced knowledge about the real dynamic state of luminous environments in daylit architectural space. For this purpose, various kinds of data on daylit environments have been gathered from daylit architectural space, for instance, office areas, apartments, and houses by field measurements under various daylight conditions in different seasons. And many useful suggestions have been obtained from the results of analyses of the data gained.
This paper reports the results of a study on a house lit only by Daylight, without any artificial illumination. The following important conclusions were made.
1) The state of fluctuation of horizontal illuminance, illumination vector, scalar illuminance, and cylindrical illuminance at the same point by daylight are similar, and unrelated to room style.
2) The level of horizontal illuminance by daylight on the floor is different at different point, but the state of fluctuation of illuminance is similar throughout a whole day.
3) The state of fluctuation of illumination vector altitude and vector scalar ratio is extremely stable under various sky conditions throughout a whole day.
4) The state of fluctuation of the above illuminances is not greatly affected by using shoji, Japanese paper sliding doors.
