Title: PERFORMANCE ANALYSIS OF A SMALL-SCALE BROILER FARM POWERED BY A PV–GRID–BATTERY ENERGY STORAGE SYSTEM
Authors: Boris Evstatiev, Nikolay Valov, Katerina Gabrovska-Evstatieva, Seher Kadirova, Nikolay Mihailov
Affiliation: “Angel Kanchev” University of Ruse, Bulgaria
Abstract: In this work, the performance of a small-scale broiler farm with a PV-Grid-Battery hybrid system is analyzed. The farm is located near the city of Razgrad, in the north-eastern part of Bulgaria, and is equipped with a 50 kWp photovoltaic installation, a 50 kW three-phase inverter, and a 61.44 kWh energy storage system, which are operating for own needs only. The study analyzes the system’s ability to provide the energy needs of the poultry farm during four cycles of broiler breeding, respectively during the spring, summer, autumn, and winter seasons. The analysis is based on a one-year long dataset with a 5 minutes timestep. The performed analysis includes assessment of the average performance during the four season-specific cycles. Furthermore, to get a better understanding about the PV-Battery installation’s ability to cover the energy needs of the farm, detailed analysis of days with different levels of cloudiness is also implemented.
Title: STRUCTURAL MORPHOLOGY AND ELECTRIC FIELD DESIGN FOR SIZE-SELECTIVE PARTICLE TRANSPORT IN CELL SEPARATION
Author: Alexandru Morega
Affiliation: National University of Science and Technology POLITEHNICA of Bucharest, Romania
Abstract: Deterministic lateral displacement (DLD) technology is a microfluidic separation method in which entrained particles interact with a periodically shifted pillar array. The method has been applied to label-free fractionation of cells, blood components, and synthetic particles. The underlying fluid-mechanics process can be augmented by electric (EF) and/or magnetic (MF) fields to enhance cell separation efficiency. The combined fluid and electric/magnetic flow in this device is governed by the Constructal Law (CL) of physics.
CL operates in DLD via the coupling between the fluid flow (or current) and the associated EF (electric current), which the experimental designer can exploit to enhance separation. Efficient DLD separation may result from controlling the CL fluid flow-electric current interaction and the device morphology (chip geometry). The DLD design must be tuned so that the EF work, fundamental to producing particle separation, is minimal, as predicted by the CL – and no supplementary law is needed to consider; CL is in physics.
Two complementary numerical experiments may be used as a design tool, and we show that finite element (FE) analysis of the device can be complemented by an equivalent analytic porous-media (PM) model.
The coupled thermal, electrical, hydrodynamic, Lagrangian FE model explicitly resolves every micropillar, while the equivalent reduced-order PM model is implemented independently in closed form. Both implementations predict predominantly streamwise transport for smaller cells and stronger lateral displacement for larger cells.
This combined FE – PE approach has benefits and limitations, which are discussed.
Title: PRACTICAL ASPECTS REGARDING THE IMPLEMENTATION OF THE ROTOR FLUX-ORIENTED CONTROL ALGORITHM ON RAILWAY TRACTION SYSTEMS
Authors: Alexandru Bitoleanu 1, Vlad Constantin Suru 1, Mihaela Popescu 1, Cătălin Suru 2
Affiliation: 1University of Craiova, Romania; 2SC PROMAT SRL, Romania
Abstract: The work presents the results of the traction system with asynchronous motors controlled by rotor flux orientation, obtained following the homologation/accreditation and performance tests of the B0-B0 4000 kW locomotives, modernized by IRLU Brasov, through the PNRR program. The control algorithm was substantiated by the authors and implemented together with specialists from SC PROMAT SRL, which manufactures traction systems with asynchronous motors.