Quantification of heat energy losses through the building envelope: A state-of-the-art analysis with critical and comprehensive review on infrared thermography

摘要

The large majority of the building heat losses occur through the building envelope. Hence, the accurate evaluation of energy leakages, quantified by the thermal transmittance (U-value), is necessary, especially for energy labelling or city energy planning purposes, to foresee proper retrofit intervention and energy strategies. Among the techniques for the U-value assessment, the one that employs the quantitative infrared thermography (IRT) has spread in the last years, thanks to the possibility of easing the abovementioned processes due to reliable results, fast inspection, measurement carried out on large areas. However, a work that collects all the available techniques, explaining their weak and strength points, together with analogies and differences among the literature experiences, and which focuses on IRT, has not been carried out until now.