Comparative Analysis of Some Thermal Technical Indexes of Building Envelopes, Obtained through Quantitative Infrared Thermography (IRT)

Abstract

Almost 50% of the final energy consumption in the Union is used for heating and cooling, and 80% of the latter is used in dwellings. The thermal technical indexes of buildings and facilities, built in the last century, don’t correspond to thermal technical regulatory framework, actual now. The normative requirements have changed, as well as the thermal technical characteristics of the buildings due to the aging, the aggressiveness of the environment in livestock farm buildings for raising pigs - high temperature and humidity, an evaporation of aggressive gases. There we have a controlled microclimate, a stationary mode of operation of a system (building envelope) could be accepted. The analytical value of the heat transfer coefficient (U) is determined. Then we determine the instantaneous values of the heat transfer coefficient (U) of the building envelope with IRT only, but using different standards. The principal contribution of this research is the attempt to examine, analyse, compare the results, obtained to determine the U-values only using quantitative external infrared thermography with different methods and calculation formulas. We try to go one step ahead - to answer how to choose the most suitable method for such an investigation and what are the criteria for exactly to asses the uncertainties for each method.