REŠEVANJE PROBLEMOV URBANEGA TOPLOTNEGA OTOKA IN VELIKE RABE ENERGIJE Z OZELENJENIMI KONSTRUKCIJSKIMI SKLOPI STAVB
GREEN BUILDING ELEMENTS AND THE URBAN HEAT-ISLAND EFFECT

Summary/Abstract: Green building elements have been gaining popularity in the last few years. They constitute passive technologies that we employ to solve problems of modern cities, thereby contributing to the sustainable development of the urban environment. The thermal efficiency of green building elements depends on the climatic characteristics of the location, relative quantity of vegetation in the building, and on urban environment geometry. The air temperature in the urban environment falls most in buildings with a green envelope in a warmer climate sited in a narrow urban canyon. In cooler climates, green building elements improve the occupants' thermal comfort. A comparison with a roof cooled by white reflective paint shows that green rooftops have a better thermal impact due to evapotranspiration. In the case of a rooftop with extensive vegetation, the dark substrate acts as a powerful heat source causing higher surface and air temperatures than a classic concrete roof. Green building elements can also be used for passive cooling, allowing for 12%-90% energy savings. The greatest savings are attained in a thermally non-insulated building in the building's upper floors, and in a hot dry climate.

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