This paper explores the integration of adaptive façade systems in curtain wall buildings as a means to enhance energy efficiency, thermal performance, and visual comfort. Starting from the geometric versatility of the hexagon and drawing inspiration from origami folding principles, the study proposes a kinetic external shading system capable of responding dynamically to variations in solar radiation. The design is inspired by principles of biomimicry and aims to contribute both aesthetically and functionally to the building envelope.

Fiber reinforced concrete is a solution whereby some of the conventional steel reinforcement can be replaced by adding fibers to the concrete mass. Steel fiber reinforced concrete is classified based on strength and ductility. Depending on the amount of fiber, the behavior can be softening or hardening. In the present paper, individual results show a specific hardening behavior. However, this fiber reinforced concrete is classified into a class with weakening behavior due to the variability of experimental results.

The night ventilation process is carried out in order to reduce the energy consumption required to cool the space during the day. This process proposes a sustainable approach to generate a comfortable indoor environment, with relatively low energy consumption. Following an extensive study documenting existing research in the field, the paper aims to describe the elements that influence night ventilation and the impact of these elements on energy efficiency and thermal comfort.

Cellular fly ash-based geopolymer with suitable physico-thermal and mechanical strength characteristics was prepared using sodium perborate as an expanding agent, palm oil as a surfactant for stabilization of the froth, montmorillonite as a nanoclay for growing the strength of geopolymer , and an alkaline activator composed of potassium hydroxide and silicate solutions. Results showed excellent thermal insulation properties (density between 438-502 kg?m-3 and heat conductivity in the range of 0.077-0.103 Wm1 K1) as well as adequate compression and flexural strength up to 5.4 and 4.1 MPa respectively, being interesting the excellent strength values obtained at early age only 7 days

The paper analyzes the performance of an air-to-water heat pump installed in a single-family home in the hilly area of Romania, during the cold season.Based on in situ measurements and simulations, COP values between 2.90–3.54 for heating and 1.71–2.62 for DHW were obtained.The results confirm the efficiency of the system in low temperature conditions and reveal the importance of correct sizing and intelligent control.The study supports the use of heat pumps as a sustainable solution for residential buildings in cold climates.

Regardless of the precision or complexity of the reliability analysis method used, the quantitative assessment of the reliability of a system requires knowledge of the values of the reliability indicators of the component elements. Obtaining realistic results for the reliability of the system is conditioned by the credibility of the values of the reliability indicators of the elements. Information on the reliability of the elements is useful both for beneficiaries (for the purpose of optimizing maintenance) and for manufacturers (for the purpose of applying corrections in design and manufacturing)

This paper presents the relation between indoor air quality (IAQ) and the efficiency of ventilation systems in indoor spaces, given their impact on the health and comfort of occupants. In the context of urbanization and modern construction trends, in which the tightness of buildings has increased significantly, inadequate ventilation can lead to the accumulation of internal pollutants, such as carbon dioxide (CO2), volatile organic compounds (VOCs), fine particles, and biological agents (molds, bacteria). The paper presents the different types of ventilation systems used in homes (natural, mechanical and hybrid ventilation), analyzing their effectiveness in maintaining a healthy indoor environment. The study highlights that proper ventilation not only prevents the build-up of pollutants, but also helps to improve occupant performance, reducing risks to respiratory and mental health. In conclusion, this paper highlights the need for a balance between energy efficiency and occupant health protection by implementing sustainable and smart ventilation solutions in modern homes.

The growing global population necessitates sustainable energy solutions to meet escalating energy demands. Geothermal energy, abundant and continuous, ranks as a leading alternative after solar energy. Integrating geothermal energy into building systems requires specialized structures. For shallow geothermal applications, thermo-active piles offer a cost-effective and efficient solution regarding both investment and operational expenses. Distinct from traditional piles, these energy piles enable thermal exchange between the pile and surrounding soil, supporting building heating, cooling, and hot water needs. Their design mandates a coupled thermo-hydro-mechanical analysis. This study presents a numerical model of a field-scale energy pile experiment conducted in Houston, Texas, validated through stress and temperature data collected during the experiment.

The CFD simulations play an important role in heat transfer processes field, enabling heat transfer mechanism the analysis through conduction, convection and/or radiation, identifying critical points in thermal insulation systems, predicting the evolution of certain parameters in systems where heat transfer processes occur, optimizing the heat transfer system design, and improving their energy efficiency. Among the systems based on thermal transfer phenomena, the refrigeration systems require some of the highest energy consumption. Therefore, one of the most effective methods for these system?s cost reducing is ensuring an optimal thermal insulation for the walls. CFD simulations can became a very useful tool in cold room parameters evaluation, such thenperature and humidity, as well as for critical areas identifying, where thermal bridges may occur, with results in uncontrolled thermal flows

Technological developments in the refrigerant industry based on the limitations imposed by REGULATION (EU) 2024/573 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 7 February 2024 on fluorinated greenhouse gases, amending Directive (EU) 2019/1937 and repealing Regulation (EU) No. 517/2014 have aligned with this regulation and, together with refrigeration equipment manufacturers, have begun to introduce refrigerants with a GWP (Global Warming Potential) of less than 150 units into the European market. This paper presents a method for the modernization of small and medium-sized commercial refrigeration installations using refrigerants such as R448A or R449A, as well as the technical implications that must be taken into account in the modernization process

Results of microwave-assisted manufacturing fine porosity-cellular glass using a liquid carbonic foaming agent (glycerol) together with water glass are presented in this paper. Under the conditions of developing the process in oxidizing atmosphere of the oven, the water glass role was to avoid the premature burning of carbon resulted after glycerol decomposing .The use of authors’ own version of microwave heating applied in the last experiments reconfirmed the solution viability and its remarkable energy efficiency. Also, as an original technique measure, water glass proportion in the mix was increased to 8-12 % leading to growing the fineness of specimen porosity