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A method to quantify uncertainties in airtightness measurements: Zero-flow and envelope pressure

机译：一种量化气密性测量不确定性的方法：零流量和包络线压力

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摘要

In airtightness measurements using the fan pressurization method, the calculation of uncertainties does not take into account the zero-flow pressure approximation. It was recently suggested that neglecting the uncertainties related to zero-flow pressure approximation could be an unrealistic hypothesis. In this study, a method for quantifying this source of uncertainty is proposed, illustrated and discussed. The method is applied to a series of 31 zero-flow pressure tests performed on a newly-constructed apartment within a period of 15 days in Brussels, Belgium. For each test, 32 different zero-flow pressure approximations were compared. Since the data had a nested structure, multiple multi-level models were used for their analysis. The results show that, for the tested building, the zero-flow pressure approximation uncertainty is 0.45, 0.91 and 1.52Pa respectively under low-, medium- and large-wind conditions. These uncertainties can be reduced to 0.42, 0.80 and 1.39Pa when using longer zero-flow pressure measurement periods. As a comparison, uncertainty in pressure measurement at 50Pa due to the equipment is 0.25 Pa. The uncertainty of zero-flow approximation makes the envelope pressure uncertainty non-negligible, therefore having an impact on the regression technique used to determine the building airtightness. (C) 2019 Elsevier B.V. All rights reserved.
机译：在使用风扇增压方法进行气密性测量时，不确定度的计算未考虑零流量压力近似值。最近有人提出，忽略与零流量压力近似有关的不确定性可能是不现实的假设。在这项研究中，提出，说明和讨论了一种量化这种不确定性来源的方法。该方法适用于比利时布鲁塞尔在15天之内对新建公寓进行的31项零流量压力测试。对于每个测试，比较了32种不同的零流量压力近似值。由于数据具有嵌套结构，因此使用了多个多层模型进行分析。结果表明，在低风，中风和大风条件下，被测建筑物的零流量压力近似不确定度分别为0.45、0.91和1.52Pa。当使用更长的零流量压力测量周期时，这些不确定度可以降低到0.42、0.80和1.39Pa。作为比较，由于设备而导致的在50Pa下压力测量的不确定度为0.25 Pa。零流量近似的不确定度使包络压力不确定度不可忽略，因此对用于确定建筑物气密性的回归技术有影响。 （C）2019 Elsevier B.V.保留所有权利。

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