Using thermography to map U-values in homes: a case study of the Heat3D system in controlled conditions

Purpose This paper provides an alternative approach to ISO 9869-1 (ISO, 2014), measuring U values of buildings, which is time-consuming and costly. Heat3D is a novel application, using thermal imaging to calculate U values. Here, we explain the early stages of the development of the method. Design/methodology/approach The performance of Heat3D was compared against ISO 9869-1 metrics under controlled conditions to minimise data “noise” from external factors. Findings The results showed that the application can accurately measure the instantaneous heat flux through a building element, with over 90% of the 200+ Heat3D survey measurements matching that of a calibrated heat flux plate to within their combined uncertainty. Practical implications Development of a rapid heat flux measurement technique, such as Heat3D, would have benefits such as quantitatively assessing new build or retrofit build quality, sizing heating systems and provide data for updated EPC, which is a forthcoming policy change. Originality/value There is an emerging literature on quantitative infrared; however, we take a novel approach in using controlled conditions and a highly characterised building to assess the method.