The public space surfaces and summer thermal comfort

Abstract

This paper recalls the importance of the relationship between the urban spaces’ facing materials and vegetation to the microclimate definition. Daytime thermal comfort in warm temperate climates in summer season is considered and, therefore, two public spaces in Portugal which present thermal discomfort are analysed. This analysis will have as reference three main considerations to keep in mind when outdoor and indoor thermal comfort is intended. Subsequently, virtual scenarios of improvement are proposed. It was found that an intersection between albedo values from facing materials and shading and evapotranspiration from trees, are crucial to the definition of outdoor and indoor microclimatic conditions. Bearing this in mind, urban design can provide more thermally balanced spaces, enhancing outdoor pedestrian activities and indoors less dependency on mechanical devices to control air temperature, which will have an impact on the reduction of CO2 emissions.