本文件描述了使用红外（IR）相机观察高发射率漫反射表面时，测量现有建筑物上不透明建筑构件热阻和热透射率的红外方法。本文件演示了通过定量评估进行筛选试验，以确定建筑构件的热性能缺陷区域。 本文件旨在测量具有光热质量的框架结构住宅的热透过率（U值），通常根据ISO 13786计算的日热容量低于30 kJ/（m2K）。

This document describes the infrared method for measuring the thermal resistance and thermal transmittance of opaque building elements on existing buildings when observing high emissivity diffuse surface using an infrared (IR) camera. This document demonstrates a screening test by quantitative evaluation to identify the thermal performance defect area of building elements. This document aims to measure the thermal transmittance (U-value) of a frame structure dwelling with light thermal mass, typically with a daily thermal capacity calculated according to ISO 13786 below 30 kJ/(m2K).