Comparative Study of Indoor Infrared Thermography Method to Estimate the Overall Thermal Resistance for Building Envelope Systems

Title:

Comparative Study of Indoor Infrared Thermography Method to Estimate the Overall Thermal Resistance for Building Envelope Systems

Authors: Xinrui Lu (Department of Civil and Environmental Engineering, Pennsylvania State University, University Park, PA 16802, United States);
Ali Memari (Department of Civil and Environmental Engineering, Pennsylvania State University, University Park, PA 16802, United States).
Issue: Vol 8, No 3 (2019)
Pages: 14-21
Section: Research Paper
DOI: http://dx.doi.org/10.7492/IJAEC.2019.014
Citation: Xinrui Lu and Ali Memari (2019). "Comparative Study of Indoor Infrared Thermography Method to Estimate the Overall Thermal Resistance for Building Envelope Systems." International Journal of Architecture, Engineering and Construction, 8(3), 14-21.
Publisher: International Association for Sustainable Development and Management (IASDM)
Abstract: The building energy consumption accounts for about 40% of the total national energy use in the U.S., and therefore accurate determination of building energy performance is highly desired. One of the key parameters in estimation of building energy performance is the thermal resistance of building envelope systems. To assess the real performance of buildings, the in-situ measurement of building envelope thermal resistance is necessary as the measured values often differ from the documented ones. In recent years, a new in-situ measurement method has drawn attention by using infrared thermography to quantitatively measure the building envelope overall thermal resistance on site. This study is focused on the comparative study of indoor infrared thermography method with several convective heat transfer coefficient models adopted in previous literatures. The results show that the infrared thermography method may be suitable for in-situ measurement with appropriate selection of the convective heat transfer model. The convective heat transfer model given in ISO 6946 is recommended to be used for indoor infrared thermography measurement for low-rise residential buildings.
Keywords: Building envelope, thermal resistance, infrared thermography, convective heat transfer
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