Abstract
I have examined the relation between the size of any dry area connected with an underground room and its daylighting performance by means of simulation. As a result, I proposed an equation by which we can approximately estimate the gain in daylight in any underground room with a dry area in terms of the ratio to that in the same room on the ground, and a nomograph in which we can read the above ratio corresponding to any size of dry area was presented. Moreover, another nomograph telling us the necessary amount of enlargement of the window's area to recover the shortage of daylight in an underground room was also presented. The measured values on a model room of 1/15 scale proved a good agreement with the computed values in the simulation.
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