The outdoor thermal environment is impacted by the built environment, e.g. anthropogenic heat,evaporation and evapotranspiration of plants, shading by trees and man-made objects, and ground surface covering, such as natural grass and artificial pavement. Due to the albedo of pavements affect the quantity of global radiation reflected to the sky, the pavement with low albedo value is one of the main factor causes the high air temperature and thermal uncomfortable for human beings. Therefore, this research focus on 4 different pavements, i.e. grass, interlocking blocks, concrete and asphalt, located in university campus, measuring the albedo value and other thermal physical parameters. The net radiation is measured by CNR1 with up and down side short- and long-wave radiation. The field experiments are conducted in different season and the albedo value of each pavement are calculated. Meanwhile, the long-term thermal comfort is calculated in the RayMan model which has been calibrated with the local climate. The analytical result indicated that the low albedo pavement (i.e. asphalt) contribute longer period for hot hours (PET > 42℃) than the high albedo ones (i.e. grass). The result could be applicable in the design of outdoor environment for the mitigation of urban heat island and improvement of human's thermal comfort.
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