Issue 3/2025

In the context of solving the slow thermal response of underfloor heating, it seems that it is appropriate to use fuzzy logic control theory. This paper deals with this approach to controlling the performance and dynamics of underfloor heating surfaces. It deals with both energy consumption and compliance with thermal comfort parameters in the heated space, in the context of comparing fuzzy control with the use of a standard PID controller.

The paper presents the determination of the permissible surface temperature of a ceiling heating based on theoretical calculations using radiation view factors and considering the allowable asymmetry of radiant temperature. Measurements of radiant asymmetry were carried out in an experimental room with different geometric configurations of the ceiling heating, and the results were compared with the theoretical calculation method. Furthermore, permissible surface temperatures of radiant ceiling heating were determined for various room geometries to ensure that the actual radiant temperature asymmetry < 5 K is maintained, corresponding to thermal comfort categories A and B. For practical use, the dependency was adapted for typical geometric cases without the need to calcula te the radia tion view factors.

The energy crisis is a hot topic in the world today and society is increasingly concerned with reducing energy consumption in buildings. In addition to saving the environment, the required savings are also due to the large increase in energy prices in recent years. In Slovakia, the most important contribution to energy savings in general is made by the thermal engineering standard STN 73 0540-2+Z1+Z2 of 2019, which by tightening the required values of thermal resistance and heat transfer coefficient of building structures causes a significant insulation of building envelopes, but improving the thermal engineering properties of buildings is not the only way to reduce energ y consumption.

This paper analyses commonly available climate data databases for building energy performance calculations. Using two family houses as examples, it presents the calculation of the delivered energy for heating based on the selected climate data. The obtained results are evaluated in an economic analysis of the actual payback period for various heat sources. The aim of the paper is to demonstrate the impact of the selection of the basic boundary condition in the form of climate data on the overall building energy performance results.

The paper compares the impact of using heat pumps in terms of their effect on reducing energy performance indicators and CO2 emissions, in comparison to the various thermal properties of the building envelope of existing buildings.

Asbestos-containing building materials can often be encountered during various maintenance activities, demolitions, renovations, and other structural modifications of old buildings. Typical examples of asbestos-containing building materials that have been used in the past are so-called boletic panels, eternit roofing, waste asbestos-cement pipes, air ducts lined with asbestos boards, etc. Prior to the planned reconstruction of old structures/buildings, it is necessary to carry out a building-technical survey to check for the presence of asbestos, i.e., an inspection to detect and determine the presence of asbestos by an authorized inspection body accredited by the ČIA, o.p.s. If the inspection reveals the presence of asbestos-containing materials, these must be removed by an authorized remediation company before the planned reconstruction, in accordance with applicable legislation. Asbestos removal in buildings must be carried out with great caution to prevent contamination of indoor areas and to ensure the health of people both inside and outside the building is not endangered.The article highlights related health risks and provides an overview of regulations and technical guidelines, including recommended limits for asbestos fibre concentrations in the air.

The article explores the impact of the new Cybersecurity Act on the electricity sector. The transposition of the European NIS2 Directive into Czech legal system extends cybersecurity regulation to entities beyond critical infrastructure. It now also covers, for example, flexibility aggregators and license holders operating the electricity data centre. The paper provides an overview of the key changes and outlines the obligations newly imposed on regula ted entities.