METHOD OF INSTRUMENTAL ASSESSMENT OF THE INFILTRATION INDICATOR
Authors: Bondarenko A.V. , Yurchenko Yevh.L. 
Published: February 2025

This article was developed based on the results of an instrumental study of microclimate parameters such as: temperature, air humidity, and CO2 carbon dioxide concentration in bomb shelters and shelters. The results of the article were obtained within the framework of the project 101082898 — UKRENERGY “Innovative Master Courses Supporting the Improvement of the Energy and Carbon Footprint of the Ukrainian Building Stock” EDU-2022-CBHE-STRAND-2) envisages the creation of new master's programs on the topic “Energy efficiency, modernization of buildings and energy planning” in Ukrainian universities and the promotion of best practices of the EU regarding educational methodologies and specific knowledge related to energy efficiency and sustainability of buildings, in particular, the introduction of innovative master's courses on energy efficiency and reducing the carbon footprint in the building stock of Ukraine [1]. This article shows the graphical dependence of the main parameters of the microclimate, such as temperature, air humidity, and the concentration of CO2 carbon dioxide, on various modes of operation of the building. Instrumental monitoring of the microclimate parameters of the bomb shelter and shelter was carried out using the NT-2000 logger. During 5 hours, parameters of temperature, relative humidity and level of carbon dioxide were monitored in different modes of operation, i.e. depending on the number of people in the room and depending on the mode of opening the external doors. During the study, the NT-2000 logger was located in the bomb shelter and shelter at a height of 1,2 m from the floor [2]. At both facilities, when a large number of people were in the research room, a significant increase in the CO2 index was recorded. When people left the research room, the logger continued to record the values of temperature, air humidity and CO2 concentration for two hours. During this period, not a single person was in the room, CO2 and temperature decreased steadily. the level of carbon dioxide in the bomb shelter dropped from 1 100 ppm to 550 ppm in 120 minutes. In the shelter, it dropped from 1 385 ppm to 819 ppm in 120 minutes. During the same period, the temperature in both cases decreased, in the bomb shelter from 10 to 8 oC, in the shelter from 14 to 11 oC. According to these indicators, a graph of the dependence of the parameters of temperature, relative humidity and carbon dioxide level depending on different modes of operation was constructed. The graph shows two values of CO2 at the beginning and at the end of the period of decrease in CO2 concentration over a period of 120 minutes. We can calculate the area of ​​the figure formed by two points of the ΔСО2 concentration values ​​as a function of the difference in the values ​​of the ΔСО2 indicators during the time interval t. Based on the obtained value of the area of ​​the figure, it is possible to give a relative qualitative assessment of the infiltration rate of the building [3].  In this way, a simplified instrumental method of qualitative assessment of the infiltration parameter was obtained. The next step is to obtain not only a qualitative but also a quantitative assessment of the infiltration parameter using an instrumental method of determining CO2 concentration, temperature and air humidity.