標準號：BS EN 12898-2001
中文標準名稱：建筑物玻璃.輻射能力的測定
英文標準名稱：Glass in building - Determination of the emissivity
標準類型：Q33
發布日期：2001/4/15 12:00:00
實施日期：2001/4/15 12:00:00
中國標準分類號：Q33
國際標準分類號：81.040.20
適用范圍：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).