Review on Appropriateness of Urban Heat Island Mitigation Technologies at Several Climates Condition

Abstract

Urban development causes changes in urban land cover and use as well as the thermal environment, which is indicated by increasing air temperature. As reported by many researchers, the physical aspect of urban areas plays an important role in the intensity of urban heat islands. This study examines urban heat island mitigation technology in urban areas in big cities in various countries. Identification of UHI mitigation technology consists of the role of geometry and building materials. We discuss the role of factors in any spatial pattern, shape, and density condition. The most studied geometric aspects are density, H/W ratio (urban canyon), and orientation. While the most studied material factors are pavements, roofs, facades, soft-scape materials in gardens, and vegetation. We confirm that urban geometric aspects affect the rate of solar radiation gain and wind effects. In comparison, material elements affect the absorption of solar radiation and the degree of reflection. This coupling factor mainly affects the temperature intensity of urban areas.