NIST 1016mm防护热板装置的不确定度评估:低密度玻璃纤维绝热材料的扩展分析。

IF 1.5 4区 工程技术
Robert R Zarr
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引用次数: 18

摘要

对美国国家标准与技术研究院(NIST) 1016毫米保护热板装置的不确定度进行了评估。不确定度报告的格式与当前NIST关于测量不确定度表达的政策一致。该报告描述了在双面或单面操作模式下运行的设备的热导率和热阻成分不确定度的测定程序。本文给出了低密度玻璃纤维毡绝热材料单面工作模式不确定性计算的广泛实例。对于这种材料,热阻的相对膨胀不确定度从25.4 mm厚度的1%增加到228.6 mm厚度的3%。虽然这些不确定度是针对特定的绝缘材料开发的,但在较小程度上,该过程和结果适用于在接近297 K(23.9°C, 75°F)的平均温度下测量的其他绝缘材料。分析确定了不确定度的主要组成部分,从而确定了测量过程中未来改进的潜在领域。对于NIST 1016 mm保护热板设备,通过开发更好的保护控制策略,包括更好的保护间隙热电堆电压和温度传感器的测量技术,可以实现相当大的改进,特别是在更高的热阻值下。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Assessment of Uncertainties for the NIST 1016 mm Guarded-Hot-Plate Apparatus: Extended Analysis for Low-Density Fibrous-Glass Thermal Insulation.

Assessment of Uncertainties for the NIST 1016 mm Guarded-Hot-Plate Apparatus: Extended Analysis for Low-Density Fibrous-Glass Thermal Insulation.

Assessment of Uncertainties for the NIST 1016 mm Guarded-Hot-Plate Apparatus: Extended Analysis for Low-Density Fibrous-Glass Thermal Insulation.

Assessment of Uncertainties for the NIST 1016 mm Guarded-Hot-Plate Apparatus: Extended Analysis for Low-Density Fibrous-Glass Thermal Insulation.

An assessment of uncertainties for the National Institute of Standards and Technology (NIST) 1016 mm Guarded-Hot-Plate apparatus is presented. The uncertainties are reported in a format consistent with current NIST policy on the expression of measurement uncertainty. The report describes a procedure for determination of component uncertainties for thermal conductivity and thermal resistance for the apparatus under operation in either the double-sided or single-sided mode of operation. An extensive example for computation of uncertainties for the single-sided mode of operation is provided for a low-density fibrous-glass blanket thermal insulation. For this material, the relative expanded uncertainty for thermal resistance increases from 1 % for a thickness of 25.4 mm to 3 % for a thickness of 228.6 mm. Although these uncertainties have been developed for a particular insulation material, the procedure and, to a lesser extent, the results are applicable to other insulation materials measured at a mean temperature close to 297 K (23.9 °C, 75 °F). The analysis identifies dominant components of uncertainty and, thus, potential areas for future improvement in the measurement process. For the NIST 1016 mm Guarded-Hot-Plate apparatus, considerable improvement, especially at higher values of thermal resistance, may be realized by developing better control strategies for guarding that include better measurement techniques for the guard gap thermopile voltage and the temperature sensors.

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来源期刊
自引率
33.30%
发文量
10
期刊介绍: The Journal of Research of the National Institute of Standards and Technology is the flagship publication of the National Institute of Standards and Technology. It has been published under various titles and forms since 1904, with its roots as Scientific Papers issued as the Bulletin of the Bureau of Standards. In 1928, the Scientific Papers were combined with Technologic Papers, which reported results of investigations of material and methods of testing. This new publication was titled the Bureau of Standards Journal of Research. The Journal of Research of NIST reports NIST research and development in metrology and related fields of physical science, engineering, applied mathematics, statistics, biotechnology, information technology.
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