Energetika. Ekonomìka, tehnologìï, ekologìâ最新文献

{"title":"DEVELOPMENT AND DETERMINATION OF PARAMETERS OF SEASONAL COLD ACCUMULATORS WITH PHASE TRANSFORMATION","authors":"Denys Derevianko, Stefan Zaichenko, Natalia Jukova, Volodymyr Bober, Vadym Shalenko","doi":"10.20535/1813-5420.3.2023.289679","DOIUrl":"https://doi.org/10.20535/1813-5420.3.2023.289679","url":null,"abstract":"The purpose of this study is to develop and justify the parameters of new structures of seasonal batteries with phase transformation of the storage material, which allow to get rid of deformations and destruction of the contacting elements of the battery structure when the aggregate state changes. The design of a seasonal battery with a phase transformation of the storage material is based on a shell that allows to compensate for the expansion of the material when the aggregate state changes. Determination of the dependence of the energy parameters on the geometric parameters and thermophysical parameters of the constituent elements of the seasonal battery with phase transformation, which allow the battery capacity and power at different stages of discharge and charge. The study of phase transition processes made it possible to establish the characteristic stages of charging and discharging the battery: heating the material to the phase transformation temperature; heat transfer for phase transformation 0°C; heating the material after the phase transformation; cooling the material to the phase transformation temperature; heat removal for phase transformation 0°C (in some cases hypothermia up to 3-4°C is possible; cooling of the material after the phase transformation. The largest battery power values occur at the stage of cooling the material to the temperature of the phase transformation and heating the material after the phase transformation (25.62 kW ). The lowest power of the battery (13.56 kW) is observed heating of the material to the temperature of the phase transformation and cooling of the material after the phase transformation, which is explained by the low heat exchange of the accumulating substance in the solid state. Based on the conducted research, recommendations were made that the prospects for the development and optimization of the design of seasonal batteries with the phase transformation of the accumulating material.","PeriodicalId":472481,"journal":{"name":"Energetika. Ekonomìka, tehnologìï, ekologìâ","volume":"74 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135545300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"OBTAINING UNSATURATED HYDROCARBONS FROM COAL","authors":"Nina Filimonenko, Костянтин Філімоненко","doi":"10.20535/1813-5420.3.2023.289665","DOIUrl":"https://doi.org/10.20535/1813-5420.3.2023.289665","url":null,"abstract":"The article is devoted to the improvement of the technology of obtaining Liquid Motor Fuels from Coal. Unsaturated hydrocarbons are the most important chemical raw material products and are widely used for producing polymers, alcohols and some other organic substances. The paper considers the proposition of technological process of obtaining Synthetic Fuel from Coal with a positive yield effect of the final product with high quality. It is possible to organize the production of Liquid Fuel is made of Coal conversion. The method of Coal conversion into Liquid Motor Fuel is its gasification and hydrogenation but this is not the only way out. The paper proposes the possibility of creating the small plants for the production of synthetic fuels and components of organic synthesis, which can be used of the capacity of metallurgical factories and shops of machine-building enterprises that are vacated areas. In modern society the need is growing to use alternative liquid fuel technologies, for example, by indirect liquefaction of coal. This is especially important for Ukraine during and after hostilities. Ukraine does not have sufficient oil and gas reserves, but it has coal deposits in the coal basin in the west of the country.
 An important aspect that is insisted on is the achievement of energy independence. Given the historical traditions and the existing structure of energy deposits in Ukraine, one of the ways to solve this strategic task should be the development of the coal industry. In addition, the environmental component of each of these types of security can be an integrator that integrates them into the national security system. This will help to find their optimal ratio in this system. Moreover, today there is no doubt that any aspect of national security, whether economic, technological or defense, loses its meaning in the event of unfitness of the environment for human life and activity. An influential factor in increasing production of coal for processing in the western part of Ukraine is the maximum extraction of coal reserves and at the same time protection of subsoil.","PeriodicalId":472481,"journal":{"name":"Energetika. Ekonomìka, tehnologìï, ekologìâ","volume":"74 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135545164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CRITERIA AND CONDITIONS OF THE INTER-CIRCUIT THERMODYNAMIC INSTABILITY OF THE NPP’S MODERNIZED TURBINE SYSTEM","authors":"Vladimir Skalozubov, Vadym Kondratyuk, Volodymyr Filatov","doi":"10.20535/1813-5420.3.2023.289659","DOIUrl":"https://doi.org/10.20535/1813-5420.3.2023.289659","url":null,"abstract":"The original method of determining the criteria and conditions of inter-circuit thermodynamic instability in the modernized system \"steam turbine - regeneration system with absorption heat pumps\" is presented. This was developed through a thermodynamic analysis of the effect of independent fluctuating deviations from equilibrium in both the wet vapor flow at the absorption heat pump inlet and the measured pressure in the absorption heat pump/low pressure mixing heaters. Unlike known approaches to modeling thermodynamic processes, the thermodynamic model of the developed method takes into account the influence of fluctuating deviations from the equilibrium state of thermodynamic parameters, which determine the criteria and conditions of interloop thermodynamic instability. Based on the analysis of the received criteria and conditions, it was established that the main cause of inter-circuit thermodynamic instability in the modernized system \"steam turbine unit — a regeneration system with absorption heat pumps\" is determined by the incompleteness (inertia) of heat-mass exchange and hydrodynamic processes during fluctuating deviations from the equilibrium state of thermodynamic parameters. Prevention of the conditions for inter-loop thermodynamic instability in the modernized system \"steam turbine unit — a regeneration system with absorption heat pumps\" can be ensured by installing flow controllers in the wet steam supply circuits from the high-pressure cylinder of the turbine to the absorption heat pumps, and absorption heat pumps in mixing heaters low pressure to maintain a constant pressure in absorption heat pumps and low pressure mixing heaters. It is also necessary to consider that the modernization of the \"steam turbine unit — a regeneration system with absorption heat pumps\" system can affect the performance and conditions of inter-loop thermodynamic instability of \"neighboring\" systems. These issues determine the need for further analysis of the validity of the modernization of the \"steam turbine unit — a regeneration system with absorption heat pumps\" systems.","PeriodicalId":472481,"journal":{"name":"Energetika. Ekonomìka, tehnologìï, ekologìâ","volume":"73 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135545169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ANALYSIS OF THE POSSIBILITY OF CHP FUNCTIONING IN THE ELECTRICITY MARKET UNDER THE CONDITIONS OF INTRODUCTION OF PRICE RESTRICTIONS ON THE MARKET","authors":"Maxim Dovhal, Anatolii Zamulko","doi":"10.20535/1813-5420.3.2023.289655","DOIUrl":"https://doi.org/10.20535/1813-5420.3.2023.289655","url":null,"abstract":"In the article, the issue of forming a strategy for ensuring competitive advantages of combined heat and power plants in the context of introducing price constraints in the electricity markets is considered, based on the analysis of functional capabilities and the economic component of the existing electricity market model. The factors influencing the formation of the cost of a unit of commodity production of a combined heat and power plant for participation in the electricity markets are also examined.
 The work also discusses the issue of adapting thermal power plants to price constraints in electricity markets, which ensures competitiveness and stability of electricity production. The main aspects analyzed in the study include SWOT analysis of CHP plants, examination of regulatory mechanisms such as ancillary services for frequency and active power regulation, and modernization and environmental adaptation strategies.
 Within the framework of the study, possibilities for enhancing the competitive advantages of CHP plants are considered, such as the introduction of the latest technologies, the development of the renewable energy market, and increasing capacity. At the same time, attention is paid to threats related to the decline in demand for electricity, changes in the fuel market, and regulatory constraints on harmful emissions.","PeriodicalId":472481,"journal":{"name":"Energetika. Ekonomìka, tehnologìï, ekologìâ","volume":"74 S1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135545168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PURIFICATION OF LIQUIDS IMPURITIES BY ELECTROMAGNETIC INFLUENCE","authors":"Oleh Terentiev, Mykhaylo Kudilchak, Natalia Jukova, Stepan Kudilchak","doi":"10.20535/1813-5420.3.2023.289724","DOIUrl":"https://doi.org/10.20535/1813-5420.3.2023.289724","url":null,"abstract":"The importance of liquid purification leads to a decrease in the concentration of pollutants mainly in the stream during its use. This paper analyzes the relevance of document verification in accordance with existing legislation. An analysis of actual physical and chemical methods of liquid purification was carried out. The creation of a working chamber for the grouping of impurities for liquid purification is described. The result was achieved by electromagnetic influence on charged impurities. The scientific news of the study of the creation of a paraboloid of rotation of impurities has been created. The principle of operation of the cleaning system is shown on the example of the grouping of oil and water impurities. Research results show the possibility of liquid purification by controlling the trajectory of impurities. The work uses the Dini equation (Italian: Ulisse Dini) to describe the mathematical model of the grouping of impurities. A model of the trajectory of impurities in the LabVIEW shell was created. The possibility of further purification of the liquid by the method of electromagnetic grouping and subsequent removal of impurities from the flow was verified. The study takes place in the installation of inductance coils on the outer surface of the impurity grouping chamber. The trajectory of the movement of impurities in the magnetic field is determined. The electromagnetic influence on the charged impurities changes their trajectory and causes the impurities to move along the Larmor radius. When the magnitude of the electromagnetic field increases, the speed of movement of the impurity increases, and the radius of motion of the impurity decreases. It has been proven that impurities with a lower density are better concentrated in the center of the RKG. The parameters of the coils for creating an electromagnetic field are selected. The model of the rotation of oil impurities in the driver is reproduced on the model. The change in the specific conductivity of the water medium with increasing magnetic field induction was verified. At the first stage, we offer the construction of a stand for further purification of liquid by the method of electromagnetic grouping of impurities. Practical recommendations are given for achieving the efficiency of the electromagnetic method of liquid purification and its reuse.","PeriodicalId":472481,"journal":{"name":"Energetika. Ekonomìka, tehnologìï, ekologìâ","volume":"78 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135544329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"VERIFICATION OF GEOMETRIC MODELS OF THE LPC ROTOR OF THE K-1000-60/3000 TURBINE UNIT BASED ON NATURAL AND CRITICAL FREQUENCIES IN THE ANSYS SOFTWARE COMPLEX","authors":"Olga Chernousenko, Bohdan Marysiuk","doi":"10.20535/1813-5420.3.2023.289670","DOIUrl":"https://doi.org/10.20535/1813-5420.3.2023.289670","url":null,"abstract":"One of the priority tasks of the energy industry is to ensure the reliable and safe operation of steam turbine units of thermal power plants and nuclear power plants. Given the difficult situation in the country, it is impossible to replace outdated equipment that has exhausted its design resource with new ones. As is known, the safety factor of the material taken into account during the design of steam turbine equipment was very approximate. At that time, there were no data on the operation of power equipment, which would have already worked for 200-220 thousand hours. in difficult operating conditions. The situation has changed now. There are power installations that have exhausted or are close to exhausting their design resource. By conducting experimental studies with metal samples of this equipment, it is possible to significantly clarify the physical and mechanical properties of steels and their damage due to operation. Therefore, the problem of extending the resource is becoming increasingly important. Computer modeling has greatly simplified the task of calculating the resource of the equipment. However, such a complex object as a steam turbine requires significant computing resources, and the calculation of equations in all finite element nodes is quite time-consuming. It is necessary to look for ways to rationalize calculation mathematical models. At the same time, the accuracy of the calculation should remain at a satisfactory level. In this work, were created simplified geometric models of the rotor of the LPC turbine unit К-1000-60/3000. The option is considered of replacing the working blades with equivalent distributed masses and toroidal rings. Verification of the obtained models based on critical rotation frequencies confirmed the possibility of replacing the working blades with distributed masses. On the other hand, the presence of toroidal rings of large radii leads to a significant reduction of critical frequencies in comparison with normalized values.","PeriodicalId":472481,"journal":{"name":"Energetika. Ekonomìka, tehnologìï, ekologìâ","volume":"74 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135545165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DETERMINATION OF OPTIMAL PACKAGES OF ENERGY EFFICIENT MEASURES FOR PUBLIC BUILDINGS","authors":"Yu. Chernetska, O. Borychenko, A. Yehorenko","doi":"10.20535/1813-5420.4.2022.273391","DOIUrl":"https://doi.org/10.20535/1813-5420.4.2022.273391","url":null,"abstract":"The paper is devoted to the problem of improving the energy efficiency of public buildings maintained with funds from the state and/or local budgets. Optimization modeling is proposed as an instument to determine the optimal packages of energy efficiency measures according to the criterion of maximum achieved savings of fuel and energy resources. Approbation of the mathematical model on actual data has shown its practical value - depending on a given budget, the optimal packages of energy efficiency measures for public buildings (on the example of Zaporizhzhia city) are determined. Based on the results of computational experiments, energy efficiency measures with the best and worst ratios of implementation costs and achieved savings of fuel and energy resources were identified. The impact of additional constraints on the composition of an optimal package of energy efficiency measures was shown to make informed and rational decisions on investing in energy efficiency improvement projects for public buildings.","PeriodicalId":472481,"journal":{"name":"Energetika. Ekonomìka, tehnologìï, ekologìâ","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135209347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}