Thermal bridges accounted for 30% of the impact on the energy performance of European residential building stock. Nevertheless, European countries and their standards do not take into account the influences of this type of anomaly. Furthermore, current methods for quantifying thermal bridges have three main drawbacks. Firstly, most of approaches consist of complex models based on fluid dynamics or finite elements as calculation procedure. Secondly, the disturbances of a thermal bridge can’t be assessed along the vertical and horizontal axis of a wall surface area, since the current methods only allow to perform local measurements. Thirdly, the stratigraphy and morphology of wall is unknown in most cases. Hence, this research proposes the implementation of a 2D U-value map to quantify the influence of thermal bridges in three heavy walls by internal quantitative infrared thermography (QIRT). The measurement campaigns were conducted on a walk-in climatic chamber to monitor and evaluate full-scale building elements. The results demonstrated that the use of 2D U-value maps could help to delimit the geometry of a thermal bridge as well as its area of greater influence, to quantify the U-value in any point of an entire wall with acceptable reliability and, to provide real information about the thermal behaviour of air voids inside opaque façades. Indeed, the U-value results measured by HFM and QIRT were similar in the inhomogeneous wall areas (from 0.08 to 8.55% of difference in most cases). In this way, the operational life of a building could be enhanced with specific refurbishment procedures.

热桥占对欧洲住宅建筑节能性能的30％。但是，欧洲国家及其标准未考虑此类异常的影响。此外，当前用于量化热桥的方法具有三个主要缺点。首先，大多数方法都由基于流体动力学或有限元作为计算程序的复杂模型组成。其次，由于目前的方法仅允许执行局部测量，因此无法沿着壁表面积的垂直轴和水平轴评估热桥的扰动。第三，在大多数情况下，墙的地层和形态是未知的。因此，这项研究提出了一个二维U值图的实施方案，以通过内部定量红外热成像（QIRT）量化三座厚壁中的热桥的影响。测量活动是在一个步入式气候箱中进行的，以监视和评估完整的建筑元素。结果表明，二维U值图的使用可以帮助划定热桥的几何形状及其影响更大的区域，以可接受的可靠性量化整个墙的任何点的U值，并且提供有关不透明立面内部空隙的热行为的真实信息。实际上，通过HFM和QIRT测量的U值结果在不均匀的壁区域中相似（在大多数情况下，差异的0.08至8.55％）。通过这种方式，