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The purpose of this study is to review modern methods of determining the resistance to heat transfer of building envelopes under natural conditions using experimental equipment. Methods for experimental determination of the resistance to heat transfer given in regulatory documents have been considered. Golunov S.V. and co-authors developed a method of determining the resistance to heat transfer based on thermal imaging examination with the placement of sensors on the surfaces of the building envelopes. Abramova E.V. together with other researchers created a method of thermal non-destructive testing using a thermal imaging system, temperature and heat flow sensors. The possibility of experimentally determining the reduced resistance to heat transfer of external building envelopes under summer operating conditions using the device developed by A.E. Rusanov’s with co-authors has been described. Wang Xin et al. proposed a device for determining the resistance to heat transfer of building envelopes with improved accuracy. As a result of the analytical review, it was concluded that the presented methods make it possible to measure the resistance to heat transfer of external building envelopes when modeling various stationary and non-stationary heat transfer processes.

The current study aims to review methods of experimental determination of the resistance to heat transfer. In order to study the special features of determining thermal resistance under natural conditions and in a climate chamber, modern patents have been reviewed. Two studies by Mureev P.N. et al. discussed in this article were intended to study the determination of the resistance to heat transfer and the influence of counter heat flows arising in the thickness of the wall enclosure under quasistationary conditions in full scale. The authors’ experiment has been analyzed, the distinctive feature of which is the introduction of sensors inside the wall enclosure, which makes it possible to more accurately determine the temperature distribution and direction of heat flows inside the enclosure. In his research, Budadin O.N. together with colleagues examined the issues of improving the quality and reliability of determining the thermal resistance of a building envelope when tested in a climate chamber, and succeded in obtaining a very low error in determining the thermal resistance. A modified climatic chamber presented as a stand with a mobile cassette for installing a sample patented by Verkhovsky A.A. and co-others has also been considered. These methods were justified by the achievement of technical research results.