中低層建築物周辺の曇天時照度比・天空率と晴天時日射エネルギー比 市街地外部空間の日射・採光の質を考慮した形態コントロール手法に関する研究(その2)

This paper aims at evaluating sunlight and skylight conditions in a modeled block in low-and-medium-rise residential area. It is turned out that sky factor is the useful index for expressing the brightness under overcast sky. Secondly, we accumulate the calculated impact of buildings on each lot to compute the whole impact of the buildings on open spaces assumed in the Building Standard Law. It is compared with the actual impact of all buildings calculated simultaneously to show that the impact of buildings is underestimated more than three hours in terms of sunshine duration on a north-south street and intersections in the accumulated result.