Abstract
Convective heat transfer coefficient at outside building wall is one of the main factors to control thermal environment of urban canopy layer. However, its manner in an urban area still remains unknown, especially a relation to wind direction and effects of surrounding buildings or street geometry. In this paper, a newly contrived estimation method of convective mass transfer coefficient by the evaporation from a filter paper was adopted to real scale measurements at tall building window. Previously to the measurements, scale effects of filter paper in various wind conditions were also tested in wind tunnel experiments. Relation between convective mass transfer coefficient (k) and 30-minute means of wind speed at 15m above the roof depends on the direction of upper stream. On the contrary, (k) has a linear relation to wind in the vicinity of the window regardless of upper wind direction.
