INFLUENCE OF RADIATION REFLECTED BY COOL PAVEMENT ON THERMAL SENSATION OF PEDESTRIANS

Abstract

The urban surface has been covered with concrete buildings and asphalt pavements. They have large thermal capacity and absorb solar heat so that heat island phenomena may appear in the urban area. Therefore increase of solar reflection at the urban surfaces is one of countermeasures of heat island, because high reflective roof (hereafter cool roof) and high reflective pavement (hereafter cool pavement) can cool the urban surface and reduce the heat flux from them to urban air. The measured data in the previous paper shows that cool pavement can reduce sensible heat flux from pavement to urban air. On the other hand, reflected solar radiation from pavement may raise surface temperature of human body and cause discomfort of pedestrians. This paper shows that measured temperature of human body models and calculated SET* on cool pavement are higher than those on ordinary pavement according to the amount of reflective heat. In this paper CFD simulations are conducted to study human body temperature when only pavement for vehicles is coated by the high reflective paint and sidewalk for pedestrians is not high reflective.