Abstract
The paper presents the basic methodical principles for the time analysis of the variations of envelope structures’ thermal insulation properties and for the substantiation of the thermal reliability criterion, which should allow the analysis of the actual parameters of heat losses during the operation of buildings. In the paper, the state of the envelope structures thermal failure, the concept of building thermal envelope thermal reliability and the principles of its rating are defined. The physical meaning and basic criterion of the envelope structure thermal reliability are formulated. The application of the thermal reliability criterion allows determining the probable variations in the thermal insulation properties during the building operation and, accordingly, the changes of the building energy performance over time.
Highlights
A modern building is a system composed of a number of subsystems that can be considered as independent systems
The structural design of the elements of the building thermal envelope determines the structural response to external influences and the nature of the formation of the relevant operating indicators for a building
The possible decrease of the thermal engineering indicators of the envelope structures depends on the features of the heat and mass transfer processes defined by the thermophysical properties of the materials and the structural design of the envelope, as well as on the critical states of moisture within the structure thickness causing the structural variations in materials and construction elements and, the energy state deterioration in the entire system
Summary
A modern building is a system composed of a number of subsystems that can be considered as independent systems. The system of enclosing structures, which is a thermal envelope of a building, is a determining factor in the context of defining the energy performance indicators for a building. TEHNIČKI GLASNIK 13, 2(2019), 129-133 failure operation of the building In this context, the state of the building, when the performance of at least one of the above-mentioned functions is not ensured, can be considered as the failed state. There are certain architectural requirements conditioned by national traditions, time trends, manufacturing capabilities, etc All these parameters of the building are majorly determined by its thermal envelope, which is composed of a system of enclosing structures, the structural solutions of which define the building performance. Gennadiy FARENYUK: THE DETERMINATION OF THE THERMAL RELIABILITY CRITERION FOR BUILDING ENVELOPE STRUCTURES
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