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Experimental analysis of cavity ventilation behind rainscreen cladding systems: A comparison of four measuring techniques

机译：防雨覆层系统后腔通风的实验分析：四种测量技术的比较

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摘要

The present article elaborates on the comparison of four measuring techniques quantifying the ventilation rate behind typical cladding systems in wall elements. In total eight full-scale test walls have been investigated in a test building located in a maritime temperate climate (Belgium). Two different commonly used cladding systems are studied: (a) brick veneer and (b) fibre cement sidings. The test walls were installed on the Southwest and Northeast facades of the building corresponding to the orientations with most extreme exposure regarding solar radiation, wind directions and wind-driven rain. In total four different measurement techniques to quantify the ventilation rate in these systems have been applied: a) tracer gas techniques, b) indirect method based on pressure measurements, c) direct method based on anemometers and d) method based temperature and relative humidity registration. The results indicate that the ventilation rate behind vented brick veneer is two orders of magnitude lower than behind ventilated cladding systems with sidings. It was found that the most appropriate measuring technique of a wall system is depending on the ventilation rate, and hence on the type of cladding. For brick veneer claddings, the method deriving the air flow rate from the pressure gauges was found to be most suitable. In the wall systems with sidings, on the other hand, the ventilation rates were sufficiently high to be measured accurately with the anemometers.
机译：本文详细介绍了四种测量技术的比较，这些技术量化了墙体中典型覆层系统背后的通风率。在位于海洋温带气候（比利时）的一栋测试大楼中，总共对八座全尺寸测试墙进行了调查。研究了两种不同的常用覆层系统：（a）砖饰面和（b）纤维水泥壁板。测试墙分别安装在建筑物的西南和东北立面上，以适应与太阳辐射，风向和风雨有关的极端暴露。在这些系统中，总共使用了四种不同的测量技术来量化通风率：a）示踪气体技术，b）基于压力测量的间接方法，c）基于风速计的直接方法和d）基于温度和相对湿度记录的方法。结果表明，通风砖贴面后面的通风率比带有壁板的通风覆层系统后面的通风率低两个数量级。发现壁系统的最合适的测量技术取决于通风速率，并因此取决于覆层的类型。对于砖饰面板，发现从压力表得出空气流量的方法是最合适的。另一方面，在带有壁板的墙系统中，通风率足够高，可以用风速计精确测量。

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