BS EN 675-2011 建筑玻璃.热传递系数(U值)的测定.热流计法

标准号：BS EN 675-2011
中文标准名称：建筑玻璃.热传递系数(U值)的测定.热流计法
英文标准名称：Glass in building. Determination of thermal transmittance (U value). Heat flow meter method
标准类型：Q33
发布日期：2011/6/30 12:00:00
实施日期：2011/6/30 12:00:00
中国标准分类号：Q33
国际标准分类号：81.040.20
引用标准：EN 673;EN 12898;ISO 8301;ISO 8302
适用范围：This European Standard specifies a measurement procedure to determine the thermal transmittance ofglazing with flat and parallel surfaces. For the purpose of this Standard, structured surfaces may beconsidered to be flat..This European Standard applies to multiple glazing with outer panes which are not transparent to far infraredradiation (in the wavelength range 5μm to 50μm), which is the case for soda lime silicate glass products,borosilicate glass and glass ceramics. Internal elements can be far infrared transparent.The procedure specified in this European Standard determines the U value (thermal transmittance) in thecentral area of glazing. The edge effects due to the thermal bridge through the spacer of an insulating glassunit or through the window frame are not included. Energy transfer due to solar radiation is also excluded.The procedure specified in this European Standard should be considered only when the thermal transmittanceof the glazing cannot be calculated in accordance with EN 673.The determination of the thermal transmittance is performed for conditions which correspond to the averagesituation for glazing in practice.