Abstract
New edition of the State Building Regulations of Ukraine DBN V.2.6-31:2021 "Thermal insulation and energy efficiency of buildings" significantly increases the requirements for heat transfer resistance of walls and coatings of civil buildings. This study was carried out with the aim of evaluating the impact of the increased requirements of DBN V.2.6-31:2021 on the energy efficiency and comfort of buildings by comparing the thermal reliability characteristics of walls and roofs of civil buildings in different regions of Ukraine. The walls and combined roofs of residential and non-residential public buildings were analysed, the requirements for which in DBN B.2.6-31:2016 and DBN B.2.6-31:2021 differ in the minimum permissible value of heat transfer resistance, but coincide in other indicators. Climate conditions for the operation of buildings are reflected by data on atmospheric air temperature at 57 weather stations of Ukraine, which are given in DSTU-N B V.1.1–27:2010. The comparison of the same type of enclosing structures is made according to the criteria of reducing annual heat losses due to the enclosing and the probable duration of thermal failures. Annual heat losses in the set of each of the 57 weather stations are calculated according to the known dependencies of thermal physics. The durations of thermal failures of enclosures according to the comfort criterion are determined by the probabilistic method previously developed by the authors, which takes into account random fluctuations in the temperature of the external atmospheric and internal air in the room, as well as the random character of the heat transfer resistance of the enclosures. The probable duration of thermal failures of enclosing structures according to the comfort criterion, depending on the permissible temperature difference of the internal air and the inner surface of the enclosing structure, established in DBN B.2.6-31, can differ by two orders of magnitude. This indicator should be used only to compare the level of thermal reliability of enclosures with the same values of the permissible temperature difference. The increase in the heat transfer resistance of walls and roofs of residential and public buildings implemented in DBN V.2.6-31:2021 led to a decrease in heat loss by an average of 17%, a decrease in the probable duration of thermal failure of walls according to the comfort criterion by 17%, and combined roofs by 54 %.
Published Version
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