One of the most rapid growths in the application of thermography is that of thermography in building envelopes. This increased growth has been prompted by the rising need for carbon emission reduction targets, the increased global energy costs, and the presentation of numerous building regulations. To understand this application and the areas of concern one must have a working knowledge of what the thermography survey approach is, including the benefits and drawbacks involved. This article will provide a brief insight to the types of surveys available and how they meet a desired outcome. Approaches to all building thermography can be categorized as either qualitative research or quantitative research. The qualitative approach is more reliant on the survey conductor's knowledge of and experience in thermography. It is the individual who is responsible for identifying defects within the building envelope. One benefit of the qualitative approach is that it does not rely on temperature measurements but rather on the differences in levels of radiosity. This is beneficial in that temperature measurements can sometimes be erroneous. The quantitative approach differs from the qualitative one as it relies entirely on measurements of the building envelope. The defects are identified based on the researcher's knowledge of and experience in thermagraphy; however, this approach utilizes the temperature statistics to determine how much heat is being removed. If one is looking to identify carbon emission reduction levels then the quantitive approach is best; however, if the aim is to identify defects it is best to use a qualitative design. Yet, the choice of survey does not end with the approach used. To locate the most effective thermography survey one must consider whether it should be carried out internally or externally. An external survey is the simpler of the two options and allows for a straight forward attainment of the thermal images. The internal survey is more complex as it requires all walls within the building to cleared in order to capture images. eys.
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May 2016
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