This paper presents study of thermal comfort calculations in public buildings, using Fanger’s method and ASHRAE standards. The influence of six main parameters – air temperature, radiant temperature, air velocity, relative humidity, metabolic rate, and clothing insulation – on human comfort sensation is analyzed. Results show that Fanger’s method provides a more accurate evaluation of parameter interaction, while ASHRAE offers simplified comfort ranges for practical design. The comfort zone for the analyzed cases ranges between 18–24 °C, depending on specific indoor conditions.

This paper presents an original approach to energy-efficient renovation of existing buildings by evaluating thermal insulation materials and their impact on energy consumption and CO2 emissions. Five insulation scenarios were analyzed using simulation software, focusing on both environmental and economic performance. The results highlight the effectiveness of innovative and sustainable solutions, providing guidelines for optimizing thermal insulation in line with the European Green Deal and EPBD 2024 requirements

This paper, entitled “Integrated Modeling and Simulation of Energy Systems for Smart Buildings”, aims to obtain relevant results regarding energy consumption in a smart building and compare them with those of a less intelligent building with the same functional regime. A comparative analysis of different building models highlights the impact of each smart transformation measure. Using DesignBuilder simulations, the study confirms the efficiency of intelligent control solutions for building energy systems. The results provide practical value for optimizing energy consumption, reducing costs, and supporting sustainable design decisions

Natural gas supply to 11 786 customers with an consumption of 16 523,3 million m3 per year from 12 localities of the Security Zone of the Republic of Moldova, connected to the transmission and distribution system of Transnistrian region, is subject to increased risk due to the lack of a clear policy of covering the costs by consumers in the region of the costs incurred by suppliers. It is worth noting that consumers in Transnistrian region pay for gas only about 11.4% of the real cost of the natural gas supplied. After the crisis of January 2025, the costs of gas supplied to the Transnistrian region are covered by a loan granted by the Russian Federation in tranches, every 10 days, the allocation of which is periodically withheld, which conditions the sectioning of the regions transmission system from the licensed operators system. In addition, there is no clarity on the sustainability of this particular financing of the gas supplies in the future.

Absorption refrigeration technology was developed as a response to major challenges, including the energy crisis, rising fuel costs, and the environmental drawbacks of conventional vapor-compression refrigeration systems. Extensive research has focused on developing strategies to enhance the COP of absorption systems, with the aim of making absorption refrigeration technology more competitive compared to conventional compression systems This study investigates a hybrid absorption heat pump integrated with heat recovery combined heating and cooling production to improve the COP of absorption refrigeration systems. The system is based on low- and high-pressure absorber/evaporator pairs, operating with H2O/LiBr as the working fluid, and driven by a low-temperature heat source. In order to drive the heat pump’s heat generator, natural gas (prepared in a boiler) or/and solar energy (prepared in solar panels) was used. The experimental reasearch were conducted on an experimental stand located in the Department of Heat Engineering and Thermal Equipment Laboratory from the Technical University of Civil Engineering, Bucharest. It can simultaneously supply both cooling and heating for preparation of domestic hot water. A performance analysis is carried out through experimental measuring data to calculate the total COP vs. COP for conventional single-effect absorption chiller under the same conditions. In recovery mode, the maximum total COP increases to 5.446 because of heat recovery from condenser and absorber. Nevertheless, the system achieves a temperature of hot water between 33.58–43.92 °C. Notably, the recovery heat mode performance is strongly influenced by the solar radiation during the month, which therefore represents a key design parameter for the proposed system

The paper presents a comparative analysis of two fire scenarios simulated using PyroSim, within a 7050 m² warehouse designated for paint storage. The first scenario excludes the activation of the ESFR sprinkler system, while the second evaluates its efficiency. Parameters such as heat release rate and temperature distribution are monitored. The results show a significant reduction in peak temperature (from 970 °C to 135 °C) and fire intensity, highlighting the essential role of sprinkler systems in limiting fire spread, protecting assets, and ensuring personnel safety

Light pollution is intensifying globally, affecting around 80% of the worlds population, a figure that rises to 99% in Europe and North America. The use of artificial light at night increases annually by at least 10% due to urbanization, industrialization, and population growth. Efforts to enhance energy efficiency and reduce energy costs are leading to technological advancements and changes in consumer behavior that help mitigate light pollution. Annually, about $50 billion is spent on energy for lighting that ultimately leaks into space, impacting nocturnal environments and various species. This pollution disrupts human sleep, circadian rhythms, and melatonin production, and alters the natural behaviors of wildlife, trees, and insects. Despite its extensive impact on health, biodiversity, and ecosystems, a unified legal framework to regulate light pollution is lacking in the EU. Effective strategies to minimize ecological impacts while maintaining city illumination are crucial.

This paper investigates the potential for improving the energy efficiency of electric boilers through the implementation of two innovative solutions. The first involves replacing the conventional electric resistance, typically immersed in water, with a mesh of carbon fiber conductors installed tangentially on the boiler shell, beneath the thermal insulation. This system operates similarly to a heating blanket, uniformly covering the boiler surface and providing a significantly larger contact area compared to traditional heating elements. Subsequently, phase change materials (PCMs) are integrated inside the boiler, with the role of storing thermal energy during the heating process and gradually releasing it during hot water consumption periods, thereby enhancing thermal performance. The study includes a detailed monitoring of the thermal behavior by installing temperature sensors at key points to analyze thermal stratification and energy efficiency. Comparative tests were conducted for three configurations: a standard boiler, a boiler with a carbon fiber conductor, and a boiler equipped with both the carbon fiber conductor and phase change materials.

This paper presents an innovative digital twin solution for thermal manikins used to evaluate indoor environmental quality in buildings. While digital twin technology is gaining traction across industrial sectors, its adoption in building sector remains limited due to the industrys slow integration of innovative technologies. The research addresses the need for more accessible tools to analyze thermal comfort, which is often treated superficially in building design phases despite its fundamental importance for occupant well-being and energy efficiency. Traditional approaches rely on costly physical testing or simplified models that fail to capture complex human-building thermal interactions, leading to suboptimal designs and post-occupancy comfort issues. The proposed solution consists of a MATLAB application that provides an intuitive interface for monitoring thermal comfort parameters and real-time visualization of thermophysiological models applied to thermal manikins. A key innovation is the bidirectional data integration with ANSYS Fluent solver, enabling real-time simulations using data extracted from physical thermal manikin and vice versa. This work contributes to understanding and implementing digital twin concepts in thermal comfort evaluation, offering an innovative technological platform that balances occupant comfort with energy efficiency while providing a foundation for future research in this evolving field.