Utilizing External Infrared Thermography for Energy Assessment of Wood-Framed Buildings in Canada
Since many existing buildings in Canada were built prior to the advent of national and provincial energy policies, quantifying building envelope thermal performance is an important step in identifying retrofit opportunities in the existing building stock. Quantitative thermography is considered as a reliable method to measure the thermal transmittance, U-values, of opaque building envelope assemblies. Previously developed external infrared thermography (IRT) methodologies mainly focused on comparison of measured U-values with nominal U-values of wall assemblies in European construction. However, using nominal U-values for wall assemblies with framing in Canada is limited due to thermal bridging effects of non-continuous members such as studs. Hence, development of IRT method to determine overall U-values, known as effective U-values, of insulated wood-framed wall assemblies commonly used in Canada is required to estimate the heat losses through the building envelope and develop detailed investigations through building energy models (BEMs). Furthermore, an automation of unmanned aerial vehicles (UAVs) equipped with IR camera for quantitative analysis of building envelope thermal properties is still challenging and requires a comprehensive analysis to optimize the flight parameters and reliability of IR camera performance during the surveys.