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采用压差法测量了天津大学校园内5种典型的常用建筑外窗的气密性,这5种窗户分别是PVC单层窗、PVC双层窗、铝合金平开窗、铝合金推拉窗以及铝合金上悬上悬窗,每类窗户测量3组,测量压差控制在0~60Pa之间。通过测量结果分析了窗框材料、开关窗形式、使用时间以及窗户所处环境对窗户气密性的影响。最终,当压差为5Pa时,前4种窗户的漏风量分布在10~20m3/h之间,而铝合金上悬上悬窗的漏风量则在35~40m3/h之间,漏风量比较大。窗户的渗漏系数C与窗户气密性存在较大关系,压力指数n基本分布与0.5~0.6之间,受气密性影响小。再根据标准GB/T 7106—2008计算了所测外窗的气密性,通过计算,PVC双层窗的气密性最好,平均为5.17m3/h·m2;铝合金上悬上悬窗的气密性最差,平均为17.9m3/h·m2。通过对实验的可重复性进行测量,发现经过测量得出低压段(≤10Pa)的漏风量受环境影响较大,高压段(≥15Pa)较小;每两次重复性测试的时间间隔为1周,每两组重复测量之间的误差都小于15%,实验可重复。
The pressure-tightness test was used to measure the airtightness of five typical exterior windows in Tianjin University. The five kinds of windows were PVC single-glazed windows, PVC double-glazed windows, aluminum alloy windows, aluminum alloy sash windows and Hanging on the aluminum hanging window, each type of window measuring 3 groups, measuring pressure control between 0 ~ 60Pa. Through the measurement results, the window frame material, the form of switch window, the usage time and the influence of window environment on the airtightness of windows were analyzed. Finally, when the pressure difference is 5Pa, the air leakage of the first four kinds of windows is distributed between 10 ~ 20m3 / h, while the amount of air leakage on the aluminum alloy suspended window hung between 35 ~ 40m3 / h, air leakage comparison Big. The leakage coefficient C of the window has a great relationship with the air tightness of the window. The basic distribution of the pressure index n is between 0.5 and 0.6, which is less affected by the air tightness. Then according to the standard GB / T 7106-2008 calculate the measured air tightness of the outer window, calculated by the PVC double-decker window the best air tightness, with an average of 5.17m3 / h · m2; Of the air tightness the worst, with an average of 17.9m3 / h · m2. By measuring the repeatability of the experiment, it is found that the air leakage rate of the low-pressure section (≤10Pa) is greatly affected by the environment and is smaller in the high-pressure section (≥15Pa); the interval between two repetitive tests is 1 Week, the error between each two repeated measurements are less than 15%, the experiment can be repeated.