Pressurization Effects On Thermal Images Of Building Envelopes

Antonio Colantonio; Gregory B. McIntosh

doi:10.1117/12.953381

21 March 1989 Pressurization Effects On Thermal Images Of Building Envelopes

Antonio Colantonio, Gregory B. McIntosh

Proceedings Volume 1094, Thermosense XI: Intl Conf on Thermal Infrared Sensing for Diagnostics and Control; (1989) https://doi.org/10.1117/12.953381
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States

Abstract

Public Works Canada carried out a program of tests to record the effects of different stable environmental conditions on a typical light frame wall under laboratory conditions. This test wall had specific built-in defects inherent to this wall type. The operating capabilities of the environmental chamber and the infrared imaging equipment were also checked. Testing took place at a single interior temperature and at seven exterior temperatures ranging from 31oC to -39oC. Three pressure differences (negative 20 Pa, neutral and positive 50 Pa interior to exterior) were produced to accentuate infiltration and exfiltration at each exterior temperature level. Both long wave and short wave infrared imagery were digitally recorded from both the interior and exterior chambers. Imagery obtained indicated light weight frame construction is better viewed from the interior. Temperature differences across the wall greater than 20oC produced the best infrared images. Exterior scanning during temperatures lower than -20oC was not recommended due to equipment operational inconsistencies. Data collected from both interior and exterior chambers indicated that changes in pressurization had the most pronounced effect on infrared imagery. This factor has the most far reaching implications to building science investigators employing infrared imagers as part of their diagnostic analysis of building envelopes. This paper deals with the effects pressure differences have on thermal images of building envelopes and the importance of this factor to building science investigators.

Citation Download Citation

Antonio Colantonio and Gregory B. McIntosh "Pressurization Effects On Thermal Images Of Building Envelopes", Proc. SPIE 1094, Thermosense XI: Intl Conf on Thermal Infrared Sensing for Diagnostics and Control, (21 March 1989); https://doi.org/10.1117/12.953381

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