BS EN 12898-2001 建筑物玻璃.辐射能力的测定

标准号：BS EN 12898-2001
中文标准名称：建筑物玻璃.辐射能力的测定
英文标准名称：Glass in building - Determination of the emissivity
标准类型：Q33
发布日期：2001/4/15 12:00:00
实施日期：2001/4/15 12:00:00
中国标准分类号：Q33
国际标准分类号：81.040.20
适用范围：This European Standard specifies a procedure for determining the emissivity at room temperature of the surfaces of glass and coated glass. The emissivity is necessary for taking into account heat transfer by radiation from surfaces at the standard temperature of 283 K in the determination of the U value and of the total solar transmittance of glazing according to [1] to [5], The procedure, being based on spectrophotometric regular reflectance measurements at near normal incidence on non-infrared transparent materials, is not applicable to glazing components with at least one of the following characteristics: a) with rough or structured surfaces where the incident radiation is diffusely reflected; b) with curved surfaces where the incident radiation is regularly reflected at angles unsuitable to reach the detector while using regular reflectance accessories; c) infrared transparent. However, it may be applied with caution to any glazing component provided its surfaces are flat and non-diffusing (see 3.6) and it is non-infrared transparent (see 3.7).