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

Blanca Tejedor, Eva Barreira, Vasco Peixoto de Freitas, Tomasz Kisilewicz, Katarzyna Nowak-Dzieszko and Umberto Berardi
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Blanca Tejedor: Group of Construction Research and Innovation (GRIC), Department of Project and Construction Engineering, Universitat Politècnica de Catalunya (UPC), C/Colom, 11, Ed. TR5, 08222 Terrassa, Spain
Eva Barreira: Department of Civil Engineering, CONSTRUCT-LFC, Faculty of Engineering (FEUP), University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
Vasco Peixoto de Freitas: Department of Civil Engineering, CONSTRUCT-LFC, Faculty of Engineering (FEUP), University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
Tomasz Kisilewicz: Department of Building Design and Building Physics, Faculty of Civil Engineering, Cracow University of Technology, 31-155 Cracow, Poland
Katarzyna Nowak-Dzieszko: Department of Building Design and Building Physics, Faculty of Civil Engineering, Cracow University of Technology, 31-155 Cracow, Poland
Umberto Berardi: Department of Architectural Science, Ryerson University, Toronto, ON M5B 2K3, Canada

Energies, 2020, vol. 13, issue 24, 1-19

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.

Keywords: thermal transmittance; heat flux meter (HFM); quantitative infrared thermography (QIRT); climatic chamber; in situ measurements; stationary conditions; dynamic conditions (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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