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Measuring the Building Envelope Penetration Factor for Ambient Nitrogen Oxides

机译：测量环境氮氧化物的建筑围护结构渗透率

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摘要

Much of human exposure to nitrogen oxides (NOx) of ambient origin occurs indoors. Reactions with materials inside building envelopes are expected to influence the amount of ambient NOx that infiltrates indoors. However, envelope penetration factors for ambient NOx constituents have never been measured. Here, we develop and apply methods to measure the penetration factor and indoor loss rates for ambient NOx constituents using time-resolved measurements in an unoccupied apartment unit. Multiple test methods and parameter estimation approaches were tested, including natural and artificial indoor NOx elevation with and without accounting for indoor oxidation reactions. Twelve of 16 tests yielded successful estimates of penetration factors and indoor loss rates. The penetration factor for NO was confirmed to be similar to 1 and the mean (+/- s.d.) NO2 penetration factor was 0.72 +/- 0.06 with a mean relative uncertainty of similar to 15%. The mean (+/- s.d.) indoor NO2 loss rate was 0.27 +/- 0.12 h(-1), ranging 0.06-0.47 h(-1), with strong correlations with indoor relative and absolute humidity. Indoor NO loss rates were strongly correlated with the estimated ozone concentration in infiltrating air. Results suggest that envelope penetration factors and loss rates for NOx constituents can be reasonably estimated across a wide range of conditions using these approaches.
机译：人类大部分暴露于环境来源的氮氧化物（NOx）都是在室内发生的。预计与建筑物围护结构内的材料发生反应会影响渗入室内的环境NOx的量。但是，从未测量过周围NOx成分的包络线渗透因子。在这里，我们开发并应用方法来利用空置公寓单元中的时间分辨测量来测量环境NOx成分的渗透因子和室内损失率。测试了多种测试方法和参数估计方法，包括自然室内和人造室内NOx升高情况，有和没有考虑到室内氧化反应。 16项测试中有12项成功估算了渗透因子和室内损耗率。确认NO的渗透因子约为1，NO2的平均渗透因子（+/- s.d.）为0.72 +/- 0.06，平均相对不确定度约为15％。室内NO2的平均损失（+/- s.d.）为0.27 +/- 0.12 h（-1），范围为0.06-0.47 h（-1），与室内相对湿度和绝对湿度有很强的相关性。室内NO损失率与渗透空气中的估计臭氧浓度密切相关。结果表明，使用这些方法，可以在很宽的条件范围内合理估计NOx成分的包络线渗透因子和损失率。

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  • 来源
    《Environmental Science & Technology》 |2019年第16期|9695-9704|共10页
  • 作者

    Zhao Haoran; Gall Elliott T.; Stephens Brent;

  • 作者单位

    IIT Dept Civil Architectural & Environm Engn Alumni Mem Hall 228E 3201 South Dearborn St Chicago IL 60616 USA;

    Portland State Univ Dept Mech & Mat Engn Portland OR 97201 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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