1.1 本试验方法包括使用热流计设备测量通过扁平矩形真空隔热板中心的稳态热传递。 1.2 通过真空隔热板的非均匀几何形状的总传热需要确定几个因素，如规范中所述 C1484 其中一个因素是面板热阻的中心。面板的中心热阻率是核心抽真空区域的热阻率的近似值。 1.3 本试验方法基于试验方法的技术 C518 但包括如本测试方法中概述的用于真空绝缘面板应用的修改。 2. 1.4 该试验方法应与实践结合使用 C1045 和实践 C1058 . 1.5 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。 本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 热流计设备被用于测量真空绝缘面板的面板部分的中心，其通常具有非常高的热阻值（即，等于或大于90m-K/W）。如规范所述 C1484 ，使用面板中心热阻，以及面板几何形状和屏障材料热导率，来确定抽空面板的有效热阻。 5.2 使用热流计设备测量非均质和高热阻试样的热阻率是设备的非标准应用，只能由了解传热和误差传播的合格人员执行。熟悉设备和真空隔热板的配置是必要的。 5.3 抽空面板的面板中心热传递特性因结构材料的组成、平均温度和温差以及先前的历史而变化。对于特定应用，抽真空面板的热传输特性的代表值的选择必须基于对这些因素的考虑，并且在不修改所有使用条件的情况下不一定适用。

1.1 This test method covers the measurement of steady-state thermal transmission through the center of a flat rectangular vacuum insulation panel using a heat flow meter apparatus. 1.2 Total heat transfer through the non-homogenous geometry of a vacuum insulation panel requires the determination of several factors, as discussed in Specification C1484 . One of those factors is the center-of-panel thermal resistivity. The center-of-panel thermal resistivity is an approximation of the thermal resistivity of the core evacuated region. 1.3 This test method is based upon the technology of Test Method C518 but includes modifications for vacuum insulation panel applications as outlined in this test method. 2 1.4 This test method shall be used in conjunction with Practice C1045 and Practice C1058 . 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Heat flow meter apparatus are being used to measure the center-of-panel portion of a vacuum insulation panel, which typically has a very high value of thermal resistivity (that is, equal to or greater than 90 m-K/W). As described in Specification C1484 , the center-of-panel thermal resistivity is used, along with the panel geometry and barrier material thermal conductivity, to determine the effective thermal resistance of the evacuated panel. 5.2 Using a heat flow meter apparatus to measure the thermal resistivity of non-homogenous and high thermal resistance specimens is a non-standard application of the equipment, and shall only be performed by qualified personnel with understanding of heat transfer and error propagation. Familiarity with the configuration of both the apparatus and the vacuum insulation panel is necessary. 5.3 The center-of-panel thermal transmission properties of evacuated panels vary due to the composition of the materials of construction, mean temperature and temperature difference, and the prior history. The selection of representative values for the thermal transmission properties of an evacuated panel for a particular application must be based on a consideration of these factors and will not apply necessarily without modification to all service conditions.