Abstract
Recently thermal environment deterioration has become one of the major problems in urban areas.“Tropical night” which means the night with high temperature in summer causes sleep discomfort and energy consumption increase. This study approached the phenomena focusing on the mechanism which discharge exhaust heat upwards from surface boundary layer and carried out some simulation calculations by a turbulent closure model to investigate the response of urban boundary layer to the exhaust heat load. The calculations showed the heat can be hardly discharged in the nighttime upwards when stable boundary layer forms on the surface and also suggested heat discharge capacity in the nighttime is lower than in the daytime.
