BS EN 673-2011 建筑玻璃.热传递系数(U值)的测定.计算方法

标准号：BS EN 673-2011
中文标准名称：建筑玻璃.热传递系数(U值)的测定.计算方法
英文标准名称：Glass in building. Determination of thermal transmittance (U value). Calculation method
标准类型：Q33
发布日期：2011/5/31 12:00:00
实施日期：2011/5/31 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 674;EN 675;EN 12898
适用范围：This European Standard specifies a calculation method to determine the thermal transmittance of glazing withflat and parallel surfaces.This European Standard applies to uncoated glass (including glass with structured surfaces, e.g. patternedglass), coated glass and materials not transparent in the far infrared which is the case for soda lime glassproducts, borosilicate glass and glass ceramic. It applies also to multiple glazing comprising such glassesand/or materials. It does not apply to multiple glazing which include in the gas space sheets or foils that are farinfrared transparent. The procedure specified in this European Standard determines the U value) (thermaltransmittance) in the central area of glazing.The edge effects due to the thermal bridge through the spacer of a sealed glazing unit or through the windowframe are not included. Furthermore, energy transfer due to solar radiation is not taken into account. Theeffects of Georgian and other bars are excluded from the scope of this European Standard.The standard for the calculation of the overall U value of windows, doors and shutters (see EN ISO 10077-1[1]) gives normative reference to the U value calculated for the glazing components according to thisstandard.For the purpose of product comparison, a vertical position of the glazing is specified. In addition, U values arecalculated using the same procedure for other purposes, in particular for predicting: heat loss through glazing; conduction heat gains in summer; condensation on glazing surfaces; the effect of the absorbed solar radiation in determining the solar factor (see Bibliography, [2]).Reference should be made to [3], [4] and [5] or other European Standards dealing with heat loss calculationsfor the application of glazing U values determined by this standard.A procedure for the determination of emissivity is given in EN 12898.The rules have been made as simple as possible consistent with accuracy.