对现行国家建筑外门窗气密性指标不能采用单位面积渗透量表述的论证

The Argument about Current National Airtight Performance Index of Building Exterior Doors and Windows Cannot be Expressed by Per Unit Area Infiltration

根据现行中华人民共和国国家标准GB/T7106-2008《建筑外门窗气密、水密、抗风压性能分级及检测方法》(包括GB/T7107-2002《建筑外窗气密性分级及检测方法》)中,对建筑外门窗气密性能分级标准都采用了两种不同方式来表述,一种是按单位缝长渗透量q1,另一种是采用单位面积渗透量q2来表述,而且两组数据的比值q2/q1=3。笔者经过论证:如果q2/q1=3成立,则外门窗的缝长L与其面积f之比值必须为3,即L/f=3,显然这是办不到的,因此标准中q2/q1=3是不成立的。也就是说q2与q1不是等效的。而且对同一外门窗用q2来表述不具唯一性,而造成混乱。因此建议废止q2,只保留q1。对双指标不等效和对q2表述的不唯一性所作的论证。

Based on the standard GB/T7106-2008,＂Graduations and test methods of air permeability,water-tightness,wind load resistance performance for building external windows and doors＂ （including GB/T7107-2002＇ Graduations and test methods for air permeability performance of windows＇）,PR CHINA,expressing that air permeability performance of external windows and doors by two different methods.Firstly,expressed by volume of air flow through the unit joint length of the opening part q1,another,by volume of air flow through a unit area q2[5].The ratio between the two sets of data is q2/q1=3.It is exact that ifq2/q1=3 is tenable,The ratio between the unit joint length of the external windows and doors and its area must be 3,that is to say,L/f=3.Apparently,it is unprocurable for that.As a result,it is a error for q2/q1=3 in the standard.In other words,q2 is not equivalent to q1.What＇s more,it is non-unique of q2 in formulation,as a result of confusion.Coming a conclusion that q2 should be abolished,and q1 remain.