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• W2194853696 abstract "Green roofs are an ancient building technique and were already constructed in the days ofMesopotamia. In the last few decades they have made a re-appearance in the building sector. Greenroofs have an ecological character and are especially useful in urban areas where they can opposethe effects of the current urbanization problems.Most of the current worldwide green roof performance research is based on a more or less specificdesign for concrete slabs in moderate climates. This research distincts itself in two ways; the researchis performed in a tropical climate, and their performance was studied on metal sheet roofs, the mostcommonly used roofing material in the area of San Pedro Sula, Honduras.The climate has a substantial influence on the circumstances the research is in. Also, the climatesinfluence on the building techniques used in Honduras is substantial. Insulation is far less importantthan in a moderate climate. Instead of preventing heat entering by insulation, natural ventilationtechniques are often used to let excess heat flow out of a building. Another difference due to theclimate is the plant selection. The tropical climate asks for another type of vegetation, than the mostused type; sedums. The search for the ideal plant is not yet completed, criteria include; growthcontrol, heat-, drought, - and rain resistance.The use of corrugated iron sheets influences the characteristics of the roof. Compared to concreteslabs, corrugated iron sheets have a lower, almost negligible R-value. This results in fasttransportation of incoming as well as outgoing heat. A corrugated iron sheet is a better radiantbarrier, which means it reflects a higher rate of incoming (solar) radiation than concrete.The advantages of green roofs are undoubtedly numerous from the ecological part of view and areespecially suitable for areas with a high building density. In these areas more and more naturalsurfaces are covered by building materials such as concrete, metal and asphalt. This transduction ofused materials influences the environment. Problems with impervious surfaces include higherambient air temperatures. Green roofs are one potential remedy for this problem.Green roofs act positively on the inner climate of a building and prevent heat radiation to thesurrounding area as well. The green roofs cool a building by providing shadow over the roof, a mainfactor in passive cooling. The plants use a substantial part of the solar radiation for their biologicalfunctions, in so doing working as a radiant barrier. Furthermore they increase the insulation valueand heat capacity of a roof. All these factors reduce the heat gain of a building and can save energyconsumption for air conditioning, which affects the ambient air temperatures.Establishing plant material on rooftops provides a multifunctional solution for the urban problems ofthe 21st century. Environmentally speaking there are no known disadvantages. Next to energyconservation and lowering ambient air temperatures benefits include storm water management,mitigation of the urban heat island effect, increased longevity of roofing membranes, and mitigationof noise and air pollution, as well as a more aesthetically pleasing environment in which to work andlive." @default.
• W2194853696 created "2016-06-24" @default.
• W2194853696 creator A5070876577 @default.
• W2194853696 date "2009-01-01" @default.
• W2194853696 modified "2023-09-27" @default.
• W2194853696 title "The energy conservation provided by green roofs on metal sheets in a tropical climate" @default.
• W2194853696 hasPublicationYear "2009" @default.
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