IMPROVEMENT OF METHODOLOGICAL BASIS OF DETERMINATION OF TIGHTNESS OF BUILDING COVER

Abstract

Tightness and energy efficiency are among the most important parameters of buildings. The airtightness of the building ensures a reduction in energy consumption for heating, especially for buildings with a large heating volume. Currently, Ukraine does not have a regulatory framework for determining the tightness of buildings. The article analyzes the international standard for determining the airtightness of buildings ISO 9972:2015 Thermal characteristics of buildings − Determination of air permeability of buildings − Method of fan injection. On the basis of the international standard, the methodical bases for determining the tightness of the building envelope have been improved, and the methodology for determining the tightness of the building envelope has been adapted for Ukraine. The article presents the methods of measuring the tightness of the building, the rules for preparing the building for measurements, as well as the calculation of air permeability parameters. This technique contains the principle of determining the parameters of tightness in the conditions of fan injection. The hermeticity of the building, or its air permeability, is expressed by the amount of air leakage in cubic meters per hour per square meter of the area of ​​the outer shell of the building when the building is affected by a pressure drop of the internal air of 50 Pa. During the test, the fan creates a pressure drop of 50Pa. A differential manometer is used to record the pressure difference between the pressure in the room and the external pressure. Using the formulas given in the article, the volume flow of air through the enclosing structures is calculated, and the air leakage rate is also calculated. Based on the determined parameters, the air exchange rate n50 and the air exchange rate q50 at the created pressure drop ∆p were calculated. The method of determining the energy efficiency class based on the n50 parameter has been improved. Based on the results of the calculations, we have the opportunity to determine the energy efficiency class based on the determined air exchange ratio.