Spaciousness in interiors

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Abstract
Since traditional criteria for window design, e.g. the daylight factor, have lost their force, interest in re-evaluating the function of windows has been growing rapidly. The concept of spaciousness as an alternative criterion is introduced, and observations in scale models differing in spaciousness under an artificial sky have been carried out. From these, spaciousness for different sky luminances has been shown to be a function of interior illuminance, room size and window size. Observations in full scale interiors were also made to confirm the validity of the results. From additional experiments, it has been found that a lower limit of just acceptable spaciousness does exist. This would be a useful criterion for use in design.

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