Conferința Internațională SIELMEN - Sisteme Electromecanice și Energetice

Low voltage circuit breaker controlled by programmable logic controller

2025-01-01T00:00:00Z

Low voltage circuit breaker controlled by programmable logic controller GABOR, Georgel; NITUCA, Costica; DRAGOMIR, Alin; CHIRIAC, Gabriel; CAZAC, Vadim; BOCA, Mihai In industrial installations for supplying electricity to various consumers, low-voltage circuit breakers play an important role in the proper functioning of the equipment, ensuring their protection in case of short circuit or overload. In this article, the automation of an energy distribution system for four consumers is realized. By programming the PLC and utilizing the Modbus communication protocol, the energy parameters of the circuit breakers are taken over, and a scenario of disconnection from the grid of a consumer is simulated. The main advantage of the automation system, consisting of PLC and HMI, is the function of automatic control of the circuit breakers through programmed scenarios. Access full text: https://doi.org/10.1109/SIELMEN67352.2025.11260766

Pathways to efficient agrivoltaics through functional requirements and light dispersion constraints for photovoltaic greenhouses

2025-01-01T00:00:00Z

Pathways to efficient agrivoltaics through functional requirements and light dispersion constraints for photovoltaic greenhouses BENIUGĂ, Constantin Răzvan; TÎRŞU, Mihai Ștefan; BURLICĂ, Radu; ASTANEI, Dragoş George; PINGESCU, Bogdan-Andrei; BENIUGĂ, Oana Cristina In greenhouses, the integration of photovoltaic (PV) systems is emerging as a solution for sustainable agriculture, allowing the dual use of land for agricultural production and energy generation. Technologies with light dispersion system represent a way to optimize inhouse light distribution while generating electricity. This paper presents an overview of current solutions and technological directions in PV-integrated greenhouse systems with light dispersion capabilities. It is highlighted the importance of harmonizing energy efficiency with plant growth conditions in greenhouses, and in this regard, adaptive technologies and climate-specific solutions play an important role. Based on this overview, we aim to extract functional and design requirements tailored to agricultural applications, for future developments in the field of agrivoltaics greenhouse systems. Access full text: https://doi.org/10.1109/SIELMEN67352.2025.11260761

Design and preparation of 3D and 2D axisymmetric multiphysics models for an inductive instant boiler simulation

2025-01-01T00:00:00Z

Design and preparation of 3D and 2D axisymmetric multiphysics models for an inductive instant boiler simulation TURCANU, Adrian This paper presents the design and comprehensive validation of 3D and 2D axisymmetric Multiphysics models for a novel 100 kHz inductive instant boiler achieving 97% thermal efficiency. The research introduces a bidirectionally coupled electromagnetic-thermal finite element model implemented in COMSOL Multiphysics, incorporating temperature-dependent material properties and a ferromagnetic double-cylinder workpiece that forms a water channel for flow optimization. The 3D model demonstrates accurate prediction of skin depth effects (δ = 0.2 mm in steel at 100 kHz) with boundary layer meshing achieving <1% energy balance error. A computationally efficient 2D axisymmetric model reduces simulation time by 78% while maintaining accuracy within 2.3% of 3D results. Experimental validation confirms temperature predictions within ±1.8°C across the 30 °C to 95°C operating range. Grid Convergence Index analysis validates mesh independence with GCI < 0.8% for critical thermal parameters. The models are released 'ready for simulation' and constitute a foundation for future work on conjugate heat transfer., design optimization., and compliance., including MATLAB Simulink co-simulations. Access full text: https://doi.org/10.1109/SIELMEN67352.2025.11260718

Current status and distribution of installed capacities from renewable energy sources (e-RES) in the Republic of Moldova

2025-01-01T00:00:00Z

Current status and distribution of installed capacities from renewable energy sources (e-RES) in the Republic of Moldova RUSU, Daniel; RACHIER, Vasile; MANGOS, Octavian; SOBOR, Ion; VOINESCO, Dinu; BURDUNIUC, Marcel This paper provides an overview of the current status of installed capacities from renewable energy sources (e-RES) in the Republic of Moldova, with a focus on solar photovoltaic energy, wind energy, and biomass energy. Using official data and district-level thematic maps, the territorial distribution of existing capacities is analyzed alongside the assessment of the theoretical potential for each type of renewable resource. The study highlights significant regional imbalances and emphasizes that a large portion of the technical potential - particularly for wind energy and biogas - remains untapped. Furthermore, recent challenges and trends in the deployment of renewable technologies are identified, with references to the legislative framework, infrastructure, and investment interest. The conclusions point to the need for coherent policies to stimulate investments and harness regional potential in order to achieve national decarbonization and energy transition targets. Access full text: https://doi.org/10.1109/SIELMEN67352.2025.11260728