Influence of cavities geometric and emissivity properties on the overall thermal performance of aluminum frames for windows
作者： Francesco Asdrubali , Giorgio Baldinelli , Francesco Bianchi
DOI: 10.1016/J.ENBUILD.2013.01.028
关键词: Materials science 、 Structural engineering 、 Gasket 、 Thermal break 、 Thermal transmittance 、 Heat transfer 、 Thermal 、 Mechanical engineering 、 Heat exchanger 、 Thermal resistance 、 Emissivity
摘要: Abstract The increasing attention to energy saving in buildings has led more accurate analysis of the thermal performance windows. In particular, use aluminum frames known a rapid development; thanks installation break systems, is nowadays comparable one wooden frames. numerous air cavities inside suggest deep investigation heat exchange process; paper, therefore, analyzes effect geometric and surface characteristics on overall profile. was focused emissivity properties cavity inner surfaces, since they play fundamental role radiation transfer; furthermore, frame evaluated when geometries some are changed with insertion rubber gaskets. All were conducted two different approaches: numerical experimental, obtaining good match between methods; validation CFD model makes it quick user-friendly tool for preliminary design optimization window high resistance.
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