Abstract
<jats:p>This article examines the influence of humidity conditions on the operational thermal characteristics of building materials and on the energy efficiency of buildings. Currently, when performing thermal engineering calculations of buildings, the calculated coefficient of thermal conductivity of building materials in an absolutely dry state is often assumed, which does not take into account atmospheric influences during operation. In this regard, there is a need to switch to more accurate calculation methods, which take into account the operational moisture content of materials and structures. The purpose of this article is to take into account the thermal conductivity coefficients λA and λB (at normal and high humidity) for a more accurate calculation of the thermal characteristics of the aerated concrete block, thereby increasing the reliability of the calculation and energy efficiency of the building. In this work, when designing buildings for performing thermal engineering calculations, the use of calculated thermal conductivity coefficients of building materials in operating conditions, where they were exposed to various external influences, is justified. The analysis and calculation of the operational thermal characteristics of building materials under cyclic atmospheric exposure is carried out, possible problems with the use of materials caused by insufficient consideration of operational humidity are considered. The results of the study can be used in thermal engineering calculations and improvement of methods for improving the energy efficiency of buildings.</jats:p>