1.1 本规程涵盖了使用热流传感器（HFT）和温度传感器（TTs）测量建筑围护结构不透明部件现场动态或稳态热行为的技术。这些数据的应用包括测定热阻或热时间常数。然而，此类用途超出了本规程的范围（有关测定热阻的信息，请参阅规程 C1155 ). 1.2 除非地下条件已知，否则将红外热成像技术与该技术结合使用，以定位高频输电和输电输电系统（以下称为传感器）的适当位置。 1.3 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户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。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 传统上，HFT已被纳入实验室测试设备，如热流计装置（测试方法 C518型 )，使用受控温度和热流路径来影响热测量。将热流传感器和温度传感器应用于现场建筑构件可以产生有关建筑热性能的定量信息，反映实际热条件下建筑的现有特性。文献包含关于如何使用这些测量的报告样本 ( 1- 8. ) . 3. 5.2 这种做法的主要优点是传感器的潜在简单性和易于应用。为避免虚假信息，高频输电系统用户应:( 1. )雇佣合适的 S , ( 2. )正确遮盖传感器( 3. )适应传感器和建筑构件的时间常数，以及( 4. )考虑由于建筑结构的性质或传感器的位置、尺寸和热阻导致的任何热流路径的可能变形。 5.3 用于建筑物测量的HFT和TTs的用户应了解建筑物构件中热流的原理，并具备以下能力: 5.3.1 使用建筑平面图、规范和热成像技术选择传感器位置，以确定测量值代表所需条件。 5.3.2 单个HFT场地不能代表建筑构件。HFT现场的测量代表HFT传感位置的条件。 适当使用热成像技术来识别平均和极端条件以及用于集成的大表面积。使用多个传感器站点来评估建筑构件的整体性能。 5.3.3 给定的HFT校准不适用于所有测量。高频输电以周围材料特有的方式干扰测量现场的热流 ( 9 , 10 ) ; 这会影响转换常数， S ，待使用。用户应考虑下列测量条件: 7.1.1 . 在极端情况下，传感器在放置位置（例如，在钣金部件上）是最重要的热特性。在这种情况下，很难实现有意义的测量。用户应确认转换系数， S ，以避免校准误差。参见第节 7. . 5.3.4 用户应准备好适应非- 采用本实施规程中描述的测量技术时的稳态热条件。这需要长时间（可能是几天）获取数据，具体取决于建筑构件的类型和温度变化。 5.3.5 热流有一个平行于高频热管平面的分量。用户应能够最小化或适应该因素。

1.1 This practice covers a technique for using heat flux transducers (HFTs) and temperature transducers (TTs) in measurements of the in-situ dynamic or steady-state thermal behavior of opaque components of building envelopes. The applications for such data include determination of thermal resistances or of thermal time constants. However, such uses are beyond the scope of this practice (for information on determining thermal resistances, see Practice C1155 ). 1.2 Use infrared thermography with this technique to locate appropriate sites for HFTs and TTs (hereafter called sensors), unless subsurface conditions are known. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.4 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. 1.5 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 Traditionally, HFTs have been incorporated into laboratory testing devices, such as the heat flow meter apparatus (Test Method C518 ), that employ controlled temperatures and heat flow paths to effect a thermal measurement. The application of heat flux transducers and temperature transducers to building components in situ can produce quantitative information about building thermal performance that reflects the existing properties of the building under actual thermal conditions. The literature contains a sample of reports on how these measurements have been used ( 1- 8 ) . 3 5.2 The major advantage of this practice is the potential simplicity and ease of application of the sensors. To avoid spurious information, users of HFTs shall: ( 1 ) employ an appropriate S , ( 2 ) mask the sensors properly, ( 3 ) accommodate the time constants of the sensors and the building components, and ( 4 ) account for possible distortions of any heat flow paths attributable to the nature of the building construction or the location, size, and thermal resistance of the transducers. 5.3 The user of HFTs and TTs for measurements on buildings shall understand principles of heat flux in building components and have competence to accommodate the following: 5.3.1 Choose sensor sites using building plans, specifications and thermography to determine that the measurement represents the required conditions. 5.3.2 A single HFT site is not representative of a building component. The measurement at an HFT site represents the conditions at the sensing location of the HFT. Use thermography appropriately to identify average and extreme conditions and large surface areas for integration. Use multiple sensor sites to assess overall performance of a building component. 5.3.3 A given HFT calibration is not applicable for all measurements. The HFT disturbs heat flow at the measurement site in a manner unique to the surrounding materials ( 9 , 10 ) ; this affects the conversion constant, S , to be used. The user shall take into account the conditions of measurement as outlined in 7.1.1 . In extreme cases, the sensor is the most significant thermal feature at the location where it has been placed, for example, on a sheet metal component. In such a case, meaningful measurements are difficult to achieve. The user shall confirm the conversion factor, S , prior to use of the HFT to avoid calibration errors. See Section 7 . 5.3.4 The user shall be prepared to accommodate non-steady-state thermal conditions in employing the measurement technique described in this practice. This requires obtaining data over long periods, perhaps several days, depending on the type of building component and on temperature changes. 5.3.5 Heat flux has a component parallel to the plane of the HFT. The user shall be able to minimize or accommodate this factor.