Impact of Stationary and Dynamic Conditions on the U-Value Measurements of Heavy-Multi Leaf Walls by Quantitative IRT

Abstract

Infrared thermography (IRT) has become a commonly applied non-destructive testing method for assessing building envelopes. Like any diagnosis tool, IRT requires an appropriate experience and principle understanding, mainly when the method is used for quantitative analyses. The challenges of the IRT often deal with the dynamic properties of building partitions. Climatic conditions have a certain variability, and the accumulated energy storage in the building components can affect their temperature as well as the calculated thermal performance. This paper aims to analyze how stationary and dynamic regimes of a quantitative IRT test could impact the measured thermal transmittance of heavy multi-leaf walls. Investigation in two European countries with different climatic conditions are reported. In this way, it is discussed which boundary conditions should be guaranteed to provide reliable information about a building envelope using quantitative IRT. In order to check the quality of the measurements, the heat flux meter (HFM) method was also implemented, following the ISO 9869. The research revealed that it could be possible to use short-lasting tests in the climatic conditions of Southern Europe, while long-term tests should be implemented in Northern European countries where climatic conditions are less regular.

Non-destructive techniques (NDT) for the diagnosis of heritage buildings: Traditional procedures and futures perspectives

“…Finally, a keypoint for the QIRT employment is the hypothesis of steady-state heat transfer coefficient, which is of course a simplification of the complex dynamics of the phenomena. In [144], it was analysed the impact of stationary and dynamic regimes on QIRT. For the purpose, heavy multi-leaf walls in two EU Countries were investigated (also via HFM method), and a discussion on boundary conditions was proposed.…”