The article highlights the problems associated with the accuracy of calculations and measurements of the thermal protection properties of multilayer building envelopes. The authors consider options aimed at improving the accuracy of calculations, such as using numerical modeling to calculate the temperature fields of structures, using hot-box testing equipment to determine the heat transfer coefficients of structural fragments, and improving the accuracy of measurements. The article provides a description of the hot-box setup and explains why the measurement accuracy is three times higher than in conventional climate chambers.

Keywords: measurement of the heat transfer coefficient, thermal protection of buildings, energy saving, measurement accuracy, calorimetric measurement method, hot box installation