Wyniki wyszukiwania - BazTech

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Magazyny energii w krajowym systemie elektroenergetycznym : Aspekty prawne i inwestycje wielkoskalowe

Sosnowski Marcin, Borowa Olimpia, Bielecki Sławomir

Elektro Info

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2023

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nr 4

14--18

PL

W artykule dokonano analizy przepisów polskiego prawodawstwa w zakresie magazynowania energii, poczynając od kwestii sformułowań samej definicji magazynu energii. W tym kontekście zestawiono informacje o obecnie działających w krajowym systemie elektroenergetycznym instalacjach magazynowania energii. Omówiono istniejące krajowe instalacje w podziale na technologie elektrowni szczytowo-pompowych oraz magazynów bateryjnych a także plany budowy nowych jednostek. Dokonano analizy funkcji i możliwości zaspokajania potrzeb systemu elektroenergetycznego, podlegającego współcześnie transformacji w kierunku zwiększenia udziału odnawialnych źródeł energii.

EN

Observing the dynamism of power growth from renewable energy sources (RES) and in view of the energy transformation of the entire national power system (NPS), it has become desirable to regulate the legal issues concerning energy storage facilities. Previous regulations not only failed to encourage potential investors, but also did not clearly define the rules of cooperation of storage units with the grid and other system participants, which could provoke a number of conflicts. Currently, Poland is witnessing the development of investments in energy storage units, of which investments by power companies in large-scale units seem to be spectacular.

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Adsorption chiller in a combined heating and cooling system: simulation and optimization by neural networks

Krzywanski Jarosław, Sztekler Karol, Bugaj Marcin, Kalawa Wojciech, Grabowska Karolina, Chaja Patryk Robert, Sosnowski Marcin, Nowak Wojciech, Mika Łukasz, Bykuć Sebastian

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2021

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Vol. 69, nr 3

art. no. e137054

EN

Adsorption cooling and desalination technologies have recently received more attention. Adsorption chillers, using eco-friendly refrigerants, provide promising abilities for low-grade waste heat recovery and utilization, especially renewable and waste heat of the near ambient temperature. However, due to the low coefficient of performance (COP) and cooling capacity (CC) of the chillers, they have not been widely commercialized. Although operating in combined heating and cooling (HC) systems, adsorption chillers allow more efficient conversion and management of low-grade sources of thermal energy, their operation is still not sufficiently recognized, and the improvement of their performance is still a challenging task. The paper introduces an artificial intelligence (AI) approach for the optimization study of a two-bed adsorption chiller operating in an existing combined HC system, driven by low-temperature heat from cogeneration. Artificial neural networks are employed to develop a model that allows estimating the behavior of the chiller. Two crucial energy efficiency and performance indicators of the adsorption chiller, i.e., CC and the COP, are examined during the study for different operating sceneries and a wide range of operating conditions. Thus this work provides useful guidance for the operating conditions of the adsorption chiller integrated into the HC system. For the considered range of input parameters, the highest CC and COP are equal to 12.7 and 0.65 kW, respectively. The developed model, based on the neurocomputing approach, constitutes an easy-to-use and powerful optimization tool for the adsorption chiller operating in the complex HC system.

3

Badanie symulacyjne wpływu geometrii tarczy hamulcowej na efektywność jej chłodzenia

Antczak Kamil, Sosnowski Marcin

International Journal of Engineering and Safety Sciences

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2020

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Vol. 1

39–52

PL

W artykule poruszono problem chłodzenia tarcz hamulcowych oraz ich wpływ na bezpieczeństwo. Wykonano trzy warianty chłodzenia tarcz hamulcowych, które następnie zostały wykorzystane w analizie obciążenia termicznego z użyciem MES.

EN

The article discusses the problem of brake disc cooling and its impact on safety. Three variants of brake disc cooling were made, which were then used in the thermal load analysis with the use of FEM.

4

Computational domain discretization for CFD analysis of flow in a granular packed bed

Sosnowski Marcin, Gnatowska Renata, Sobczyk Jacek, Wodziak Waldemar

Journal of Theoretical and Applied Mechanics

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2019

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Vol. 57 nr 4

833--842

EN

The paper reports results of an analysis concerning the infuence of a computational domain discretization method on the numerical stability of a model as well as the calculation error. The topology of a packed bed of a granular material consisting of granules contacting tangentially in one point makes the modeling of heat and mass transfer due to the fluid flow in such a domain a chalenging task. Therefore, the contribution of this paper constitutes a summary of discretization methods with discussion and guidelines allowing one to effectively select the most favourable method dedicated to discretization of the domain. The validation using Particle Image Velocimetry and evaluation of the impact of inflow velocity on the experimental and numerical research results are also presented in the paper.

5

Agregaty adsorpcyjne – jak się sprawy mają? Przegląd konstrukcji modyfikowanych złóż adsorpcyjnych

Grabowska Karolina, Krzywański Jarosław, Sosnowski Marcin, Nowak Wojciech

Energetyka Cieplna i Zawodowa

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2019

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Nr 5

112--119

PL

Podstawowy mankament adsorpcyjnych systemów chłodniczych to dziś niska sprawność procesu roboczego, która jest skutkiem występowania dużych oporów przepływu ciepła na granicy wymiennik ciepła - usypany sorbent. Jednak z uwagi na proekologiczność tej technologii oraz możliwość efektywnego zagospodarowania niskotemperaturowych źródeł energii cieplnej do zasilania tych urządzeń, poszukiwana jest innowacyjna konstrukcja złoża, która pozwoli zintensyfikować procesy wymiany ciepła i masy zachodzące w sekcji sorpcyjnej agregatów.

6

Experimental study of thermal effects in cooling a circular cylinder in lock-on conditions

Gnatowski Adam, Sosnowski Marcin, Pajdak Anna, Sobczyk Jacek

Advances in Science and Technology. Research Journal

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2018

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Vol. 12, no 2

42--51

EN

The paper presents a simple method for determining the phenomenon of unsteady thermal effects in cooling a circular cylinder. The research has been undertaken in order to explain the thermoaerodynamic processes, which are characterized by the turbulent structure of the flow around a stationary rigid heated cylinder cooled by the oscillating flow. The forced convection of heat occurs in the presence of not only random velocity fluctuation but also in the conditions of periodical forms of motion caused mainly by the process of vortex going down and externally formed oscillations of the inflow. The Nusselt number was evaluated at various frequencies of disturbances of the inlet velocity field, especially in lock-on conditions, on the surface of the circular cylinder versus angular location Θ = 0 180°. The subject of the study focuses on the analysis of current state of the problem and development of the method to measure and calculate basic values that characterize unsteady processes of thermal effects on the circular cylinder surface and indication of the directions of further work.

7

Effect of PVP and Polybond Compatibilizers on Dynamic Properties of Polymer Blends Analyzed with DMTA

Gnatowski Adam, Sosnowski Marcin

Advances in Science and Technology. Research Journal

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2018

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Vol. 12, no 1

36--40

EN

The properties of the polymer blends depend significantly on the type of the components. That kind of influence is manifested especially in the change of physical properties. The crucial condition for reaching the homogeneity and the properties of a polymer material is its mutual miscibility. Additional agents that make mixing easier are usually applied. They have reactive effect which results in a chemical modification of output polymer along with the change in its chemical structure and the structure of macrochains. In order to achieve this within the confines of the carried research, the polyvinylpyrrolidone (PVP) and polybond has been used. Some results concerning mechanical properties of polypropylene (PP) and polyamide (PA) blends with the addition of PVP and polybond are presented in the paper. In case of mixing PP with PVP, the hydrophobic interactions occur in the created macromolecules with the participation of the hydrocarbon chains. In case of mixing PA with PVP, the PVP solution in PA is created, with strong intermolecular interactions, including the hydrogen ones. The intermolecular interactions occur and they differently influence parameters of the modified materials in the blends on the basis of such polymers. Therefore the aim of the research was to evaluate the influence of the compatibilizers such as PVP and Polybond 3150 on the dynamic properties of PP/PA blends. The analysis of dynamic proprieties of polymer blends was performed with the Dynamic Mechanical Thermal Analysis (DMTA). The mixing of polymers in different proportions with compatibilizers (PVP, Polybond 3150) results in materials of completely different properties in comparison to the base materials. Detailed results concerning response to sinusoidal load in function of temperature and frequency are presented in the paper.