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首页> 外文会议>World Renewable Energy Congress >Uncertainties in the determination of emissivity and correlations between near infrared reflectance and thermal emittance of coated glass products
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Uncertainties in the determination of emissivity and correlations between near infrared reflectance and thermal emittance of coated glass products

机译：镀膜玻璃制品的发射率测定中的不确定性以及近红外反射率和热发射率之间的关系

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The emissivity of coated glazing is commonly determined from spectral reflectance measurements using a specular reflectance accessory or other suitable reflectance attachment. The EU Thermes RTD project undertook a 19 laboratory intercomparison to establish the state-of-theart of infrared reflectance measurement accuracy and uncertainty and to identify any needs for improvement. Six test samples were selected to provide samples with low, medium and high infrared reflectance. In addition, bare gold mirrors were prepared for distribution to each participant to serve as the reference material. Both the reference mirrors and the round robin samples were calibrated and evaluated prior to delivery to enable closely characterised and similar sample sets to be prepared. A measurement procedure requiring a sequence of 18 measurements undertaken in a strict order was developed. The analysis indicates uncertainties in the final results which are less than + 0.01. Factors such as instrument resolution, number of scans and time of acquisition do not appear to have been significant in affecting measurement accuracy. This paper also identifies correlations that exist between the measured infrared reflectance, and hence the thermal emittance, and the measured near infrared reflectance of coated glass products. These correlations are essentially linear and enable the estimation of the thermal emittance of a coated glass pane from a measurement made in the near infrared spectral region. It is shown that coated glass products fall into two essential categories: (ⅰ) conventional solar control products and (ⅱ) low emittance coated products which may or may not be for solar control applications.
机译：通常使用镜面反射附件或其他合适的反射附件根据光谱反射率测量确定涂层玻璃的发射率。欧盟Thermes RTD项目进行了19次实验室比对，以建立最新水平的红外反射率测量准确性和不确定性，并确定需要改进的地方。选择六个测试样品以提供具有低，中和高红外反射率的样品。此外，还准备了裸金镜以分发给每个参与者，以用作参考材料。在交付之前，应校准并评估参考镜和轮循样品，以使样品的特性和相似性都得到密切的准备。制定了一种测量程序，要求按严格顺序进行18次测量。分析表明最终结果的不确定度小于+ 0.01。仪器分辨率，扫描次数和采集时间等因素在影响测量精度方面似乎并不重要。本文还确定了镀膜玻璃产品的红外反射率和热辐射率与近红外反射率之间存在相关性。这些相关性基本上是线性的，并且使得能够根据在近红外光谱区域中进行的测量来估计涂覆玻璃板的热辐射率。结果表明，镀膜玻璃产品可分为两大类：（ⅰ）常规日光控制产品和（ⅱ）低辐射镀膜产品，这些产品可能会也可能不会用于日光控制应用。

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