Certification of Buildings and Measures of Energy Efficiency Class Improvement

Nowadays, the problems of energy efficiency and energy saving are found in different spheres of construction. Various energy-efficient technologies are used to reduce energy consumption. The certification process is carried out at different stages: design, construction and reconstruction, which is leading to improvement of energy efficiency of the building, etc. The article covered the European standards that determine the coefficient of seasonal use of thermal energy (E), as well as the current energy efficiency classes of the Republic of Armenia. Both the EU and the Republic of Armenia have tightened requirements for enclosing structures. In Armenia, the thermal characteristics of enclosing structures can be improved by 15% to 41% depending on the degree-day value of the heating period. The value of the specific characteristic of thermal energy depends on climatic conditions, space-planning solutions, orientation of the building, etc. The standardized value of this characteristic for heating and ventilation varies from 0.414 to 0.336 W/m<sup>3</sup>°C depending on the area of the heated building and its number of storeys. And for a residential building with an area of 1000 m<sup>2</sup> and more, the non-standardized value does not depend on the number of storeys of the building. Classes of energy efficiency of buildings are determined by the value of the deviation of the calculated value of the specific characteristic of the consumption of thermal energy for heating and ventilation of the building from the standardized one. For determining the class of energy efficiency, the article considers a one-story residential building without thermal insulation and with thermal insulation of enclosing structures. To increase the energy efficiency class of a building from D to C, it is necessary to improve the thermal characteristics of the enclosing structures, i.e. reduce heat loss of buildings by 30% or more.