Energetika. Ekonomìka, tehnologìï, ekologìâ最新文献

{"title":"DETERMINATION OF THE VISCOSITY OF A MULTIPHASE MEDIUM USING THE THEORY OF SIMILARITY AND THE THEORY OF THE REGULAR THERMAL REGIME","authors":"Olga Vlasenko","doi":"10.20535/1813-5420.3.2023.289674","DOIUrl":"https://doi.org/10.20535/1813-5420.3.2023.289674","url":null,"abstract":"The properties of each liquid can be characterized by a whole complex of various physical quantities: values of density, viscosity, electrical conductivity, heat capacity, surface tension, etc. At the current stage of technological development, the measurement of liquid viscosity is an urgent task in various areas of human life: automotive, oil and gas, aviation, food, medical and a number of other industries. Viscosity (internal friction) is the property of fluid bodies (liquids and gases) to resist the movement of one of their parts relative to another. Viscosity is a non-constant value and changes depending on the temperature of the liquid medium, the presence of impurities in its composition, and the value of the resource. It can be kinematic, dynamic, conditional and specific. However, indicators of kinematic or dynamic viscosity are most often used. The experimental results of viscosity determination were obtained on the stand, which is a component of the experimental and calculation method. The main elements of the experimental setup are two working cavities - external and internal. Criterion equations in the first and second approximation, consisting of similarity criteria, namely the Reynolds criterion and the Prandtl criterion, were developed to describe the heat transfer to three-phase media. Viscosity was determined in the first approximation using the criterion equation for \"model liquids\", and in the second approximation using the criterion equation obtained jointly for \"model liquids\" and the substrate. The difference between the viscosity found in the two approximations is up to ±30...40%. Key words: regular thermal mode, biogas, substrate, biogas installation, thermal stabilization, thermophysical properties, experimental and calculation method, mathematical model.","PeriodicalId":472481,"journal":{"name":"Energetika. Ekonomìka, tehnologìï, ekologìâ","volume":"74 S4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135545299","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":"HIGHLY EFFECTIVE DIRECT CONTACT HUMIDIFIER FOR THERMAL DESALINATION SYSTEM","authors":"Volodymyr Sereda, Liu Yang, Tetiana Podstievaia","doi":"10.20535/1813-5420.3.2023.289729","DOIUrl":"https://doi.org/10.20535/1813-5420.3.2023.289729","url":null,"abstract":"The aim of the work is to increase the efficiency of thermal desalination systems with a humidification-dehumidification air cycle due to the reduction of electricity consumption. The most common designs of heat exchangers for air humidification have significant aerodynamic and hydraulic drops. To eliminate this disadvantage, it is proposed to use the internal volume of the vertical tube as an active heat and mass transfer zone during moisture evaporation from salt water to air. The operation of such desalination system has been mathematically modeled and its energy characteristics were determined. A special feature of the mathematical model is the consideration of heat and mass transfer equations for the humidifier and dehumidifier. The effective air velocity in the tube is 3 m/s. Effective operation of thermal unit with a film humidifier is possible then air mass flow is equal to the salt water flow. In this case, the geometric dimensions of the tube must be within the following limits: diameter 20...30 mm, height 2...2.5 m. The conducted mathematical modeling and obtained results give reasons to assert, that for the same rate of evaporation, the film heat exchanger has the lowest aerodynamic and hydrodynamic drops compared to other types of humidifiers. The use of such direct contact device will lead to a decrease in the electricity consumption necessary for salt water and air circulation in the humidification-dehumidification thermal installation.","PeriodicalId":472481,"journal":{"name":"Energetika. Ekonomìka, tehnologìï, ekologìâ","volume":"79 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":"135544326","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":"INTELLIGENT BUILDING MONITORING AND MANAGEMENT SYSTEM «ARIANT»","authors":"Ihor Cherneshchuk, Halyna Cherkashyna","doi":"10.20535/1813-5420.3.2023.289706","DOIUrl":"https://doi.org/10.20535/1813-5420.3.2023.289706","url":null,"abstract":"The speed of development of technologies of automated systems determines regular updating, creation of new technical solutions in this field, the niche of home automation is no exception. The implementation of \"smart\" building monitoring and management systems is designed to ensure an increase in the level of energy efficiency of processes related to energy consumption, as well as the comfort and safety of these processes. Many variants of such systems are offered on the market [1,2,3]. Today, there are state documents that regulate the design, installation and operation of the relevant systems[4]. But the problems of the criteria for choosing the layout and functions of the system, understanding and correct use of its capabilities are extremely acute and open. In addition, the question of the influence of the operation of the automated system of a separate building on the characteristics of the external energy supply remains open. After all, the deterioration of external conditions will lead to an increase in losses during the delivery of an energy resource, accordingly, an increase in the tariff for the delivery of the corresponding resource.","PeriodicalId":472481,"journal":{"name":"Energetika. Ekonomìka, tehnologìï, ekologìâ","volume":"78 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135544330","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":"CONCEPT OF AN ENSEMBLE FORECASTING SYSTEM FOR OPTIMIZATION PROBLEMS OF CONTROL OF SOLAR MICROGRID","authors":"Dmytro Matushkin, Alla Bosak","doi":"10.20535/1813-5420.3.2023.289651","DOIUrl":"https://doi.org/10.20535/1813-5420.3.2023.289651","url":null,"abstract":"Accurate probabilistic forecasts of renewable generation are the driving force for optimizing the operation and management of MicroGrid systems. Combining forecasts of different individual models can improve forecast accuracy, but unlike combining point forecasts, for which simple weighted averaging is often a plausible solution, combining probabilistic forecasts is a much more complex task. Today, ensembles of forecasting models are one of the promising directions for problem solving, where forecasting accuracy is more important than the ability to interpret the model. The main idea of ensembles is the training of several basic models and the aggregation of the results of their work. Empirical studies show that combinations of forecasts, on average, are more likely to produce better forecasts than methods that are based on selecting only one forecasting model. When building ensembles, the issue of ensuring diversity of models and effective training of model members of the ensemble becomes especially relevant. The article is devoted to solving the issues of building an ensemble model for forecasting photovoltaic (PV) power, which combines the results of several basic probabilistic models. Using the ensemble method proposed by the authors can improve forecasting accuracy and reduce the time required for training and evaluation of ensemble member models. Directions and prospects of further research are formulated.","PeriodicalId":472481,"journal":{"name":"Energetika. Ekonomìka, tehnologìï, ekologìâ","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135545167","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":"THE METHOD OF COMPARATIVE EVALUATIONS OF COMMERCIAL OFFERS OF ELECTRICITY SUPPLIERS FOR CONSUMERS WITHOUT HOURLY ELECTRICITY METERING","authors":"Ihor Blinov, Eugene Parus, Oleksandr Klymenko","doi":"10.20535/1813-5420.3.2023.289654","DOIUrl":"https://doi.org/10.20535/1813-5420.3.2023.289654","url":null,"abstract":"The article highlights the main approaches to choosing the optimal option for purchasing electricity for consumers without hourly electricity metering, who purchase electricity from suppliers at free prices. The components of the cost of electric energy for the final consumer were investigated and the consumer's ability to influence the value of these components was noted. The method of comparative evaluations for the consumer's choice of the optimal commercial offer from electricity suppliers is presented.","PeriodicalId":472481,"journal":{"name":"Energetika. Ekonomìka, tehnologìï, ekologìâ","volume":"73 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135545170","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":"MECHANISMS OF STATE STIMULATION FOR RENEWABLE ENERGY DEVELOPMENT","authors":"Vitalii Stepanenko, Anatolii Zamulko","doi":"10.20535/1813-5420.3.2023.289709","DOIUrl":"https://doi.org/10.20535/1813-5420.3.2023.289709","url":null,"abstract":"The paper is devoted to the analysis of directions for stimulating the development and attracting investment in the renewable energy sector of Ukraine. For the energy sector during the recovery period, the development of renewable energy sources will be fundamental. The problems associated with this development can be divided into such groups as: the formation of mechanisms that will ensure controlled, efficient development; and technical connection issues.
 Currently, a wide range of strategies is being applied in different countries. However, which of the various instruments is the most effective and efficient for increasing the share of RES is still a topic of research. They should be implemented in a market-based manner without interfering with the economic activities of entities and with maximum benefit to the power system.
 At present, the construction of renewable energy facilities is carried out at the expense of the feed-in tariff and solely from the standpoint of commercial attractiveness, without considering the technical parameters of the grid, and further uncontrolled growth of their capacities poses risks to the normal functioning of the country's energy system. The priority of such tariff regulation, which actually launched the era of intensive development of renewable energy, has exhausted its potential and needs to be replaced by other mechanisms of state regulation.
 Incentive mechanisms should be implemented in a market-based manner without interfering with the economic activities of entities and with maximum benefit to the energy system. These mechanisms include auctions for the distribution of support quotas and for the sale of electricity from RES; corporate power purchase agreement; contracts for difference; feed-in premium; provision of balancing and ancillary services.
 Each of these mechanisms has its own component of influence on the controlled and stable development of renewable energy. Therefore, it is necessary to use a combination of these incentive mechanisms that can be adjusted in accordance with the current state of the power system at any long-term point in time.","PeriodicalId":472481,"journal":{"name":"Energetika. Ekonomìka, tehnologìï, ekologìâ","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135544328","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":"VIRTUAL MODEL OF THE SYSTEM \"INDUCTION MOTOR - SOFTSTARTER WITH TWO CONTROLLED PHASES\"","authors":"Anton Toropov, Leonid Listovshchyk, Liliya Toropova, Oleh Terentiev","doi":"10.20535/1813-5420.3.2023.289715","DOIUrl":"https://doi.org/10.20535/1813-5420.3.2023.289715","url":null,"abstract":"One of the most commonly used start methods of induction motors is starting by gradually increasing the supply voltage. At the same time, softstarters based on thyristors or triacs are used, which are cheaper in comparison with frequency inverters based on IGBT - transistors. In turn, the disadvantage of this method of starting with significant reduction of the starting torque, so the possibility of using such starters for various executive mechanisms requires careful research. In the presence of a limitation of power source power, especially in wartime conditions, the problem of limitation of starting currents, especially in the case of using starters with two adjustable phases, is actual. To take into account the multiplicity of starting currents for different types of mechanisms, a mathematical model of the system \" induction motor - softstarter with two controlled phases\" was created. The model differs from the known ones by the possibility of limiting the power of the power supply network, the appearance of the mechanical characteristics of the executive mechanism and the starting moment at voltage ramp start mode. Transient processes in relative units for the possibility of estimating the multiplicity of starting currents to determine the required power of the autonomous power source are presented. To assess the adequacy of the mathematical model, a research stand with measuring of motor winding currents using a current transformer and a microprocessor device with an oscillography function was created. In the work, a comparative analysis of the results of modeling and experimental studies on a physical model is carried out, herewith the discrepancy of the results did not exceed 10%. It was determined that when using a soft-start device with two adjustable phases, even with small voltages, the current multiplicity is quite high and requires the use of a power source of greater power, but less than in the case of direct start. Formulated conclusions based on research results and recommendations for further reduction of starting currents.","PeriodicalId":472481,"journal":{"name":"Energetika. Ekonomìka, tehnologìï, ekologìâ","volume":"78 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":"135544337","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 METHODS OF CHANGING VOLUMES OF ELECTRICITY GENERATION AT SOLAR POWER PLANTS","authors":"Andriy Khomiak, Viktor Rozen","doi":"10.20535/1813-5420.3.2023.289652","DOIUrl":"https://doi.org/10.20535/1813-5420.3.2023.289652","url":null,"abstract":"The article examines the methods of changing electricity generation schedules at solar power plants when operating under the central regulator of the power system. An analysis of the existing regulation methods was carried out, and a new method of controlling the generation of solar power plants under the central regulator of the power system was proposed.
 Background. The increase in the share of solar electricity generation in the energy systems of the countries of the world leads to the need to control and manage the process of electricity production to increase the stability and sustainability of the energy system. A significant price for compensation of imbalances in the energy system is included in the tariffs, which affects the end consumers of electricity.
 Objective: increasing the adequacy of the results of the distribution of deficit frequency containment reserves, frequency restoration reserves to compensate for imbalances that arise when generation is changed at solar power plants. Reducing the cost of compensation for imbalances that occur when changing generation at solar power plants. To solve the goal, it is necessary to analyze the existing methods of compensating power system imbalances that arise as a result of changes in generation at solar power plants and to propose a new technical and mathematical solution for the distribution of deficit reserves of support and frequency restoration.
 Methods: the social engineering approach of forecasting and modeling was used to analyze the processes affecting the method of controlling the generation schedule of the solar power plant.
 Results. A new mathematical and technical solution for compensating the imbalance in the power system in the event of a rapid change in the electricity generation schedule at solar power plants is proposed. For the first time, the given task was solved using a new technical and mathematical solution. Such a technical and mathematical solution can be widely used in the management of the electricity generation schedule at solar power plants in many system operators in different countries of the world, where there is a problem of insufficient for frequency containment and restoration reserves, and the amount of solar electricity generation has a significant share in the total amount of electricity generation energy.
 Conclusions. Existing methods of compensating power system imbalances arising as a result of changes in generation at solar power plants are analyzed and a new technical and mathematical solution for the distribution of deficit reserves of frequency containment reserves and frequency restoration reserves is proposed. The proposed technical and mathematical solution makes it possible to predict an event during which there will be a change in the level of electric energy generation at solar power plants, to transmit information to the central regulator of the energy system, which in turn will give a command to change the sc","PeriodicalId":472481,"journal":{"name":"Energetika. Ekonomìka, tehnologìï, ekologìâ","volume":"74 S3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135545301","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":"SYSTEMATIC INFORMATION BASE OF ENERGY-EFFICIENT APPLICATIONS FOR AVIATION PETROL","authors":"Sergii Boichenko, Iryna Shkilniuk, Anna Yakovlieva, Sofiia Dokshyna, Ihor Kuberskyi, Olena Sibilieva","doi":"10.20535/1813-5420.3.2023.289700","DOIUrl":"https://doi.org/10.20535/1813-5420.3.2023.289700","url":null,"abstract":"The additives in petrol was started to use in the first half of the twentieth century. In the late 1970s, a qualitative conceptual change in the development of this area of science and practice took place. Environmental pollution from harmful emissions led to the modification of petrol formulations and structural improvements of engines. The problem of improving the quality of gasoline and fuels for jet engines is usually solved in two ways: by developing high-quality new products and by efficient use of traditional ones.
 The proposed work analyses the scientific literature on energy-efficient additives to aviation gasoline and, on this basis, creates a systematic information base, namely: classification of the range of additives to gasoline (by the following features: chemical, physical and biological stability enhancers; flash point modifiers; combustion modifiers; washing; dopes that promote efficient operation of fuels at low temperatures; friction modifiers; marking agents; anti-corrosion agents; safety enhancers; surface-active property modifiers) and the range of anti-detonation and environmental (anti-emission) additives in aviation petrols.
 The following additives are manufactured and approved for use in Ukraine: poly-functional additives representing a complex mixture of manganese compounds and mixtures of paraffinic and naphthenic hydrocarbons (TU 30218597.001[in Ukrainian] \"Poly-functional additives \"Eco-Octane\". Technical specifications\"); iron-containing multifunctional additives \"Standard\"; there are also known developments of oxygenates based on methanol, ethanol and other alcohols, alcohol processing products, ethers and other oxygen-containing compounds.
 The research is being carried out within the framework of the project \"Development of a technology for the production of new environmentally friendly high-octane aviation gasoline from domestic raw materials\" at the expense of the state budget in accordance with the Order of the Cabinet of Ministers of Ukraine of 12 August 2022 No. 713-r \"Pro zatverdzhennia pereliku naukovo-tekhnichnykh (eksperymentalnykh) rozrobok v ramkakh vykonannia derzhavnoho zamovlennia na naivazhlyvishi naukovo-tekhnichni (eksperymentalni) rozrobky ta naukovo-tekhnichnu produktsiiu u 2022 rotsi\" [in Ukrainian] (registration number 2020.01/0242).","PeriodicalId":472481,"journal":{"name":"Energetika. Ekonomìka, tehnologìï, ekologìâ","volume":"78 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135544335","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 ENERGY EXCHANGE PROCESSES WHEN BALANCING REGIMES ENERGY SUPPLY SYSTEMS WITH DISTRIBUTED GENERATION","authors":"Sergei Denysiuk, Vladyslav Lysyi","doi":"10.20535/1813-5420.3.2023.289648","DOIUrl":"https://doi.org/10.20535/1813-5420.3.2023.289648","url":null,"abstract":"It is shown that maintaining a balance between the production and consumption of electric energy is an important condition for the stable operation of modern energy supply systems. The active increase in the share of renewable energy sources forces the use of new algorithms for balancing demand and supply, in particular, at the expense of flexibility. This implies the need to implement new technological solutions and approaches to balancing the modes of generation and consumption (the ability to quickly respond to changes in demand and supply), which, in turn, requires a detailed analysis of energy exchange processes in electric power systems.
 It is recognized that there is a need for an in-depth analysis of the balance of energy components, and an assessment of electromagnetic compatibility in electric power systems, especially in the conditions of the growing influence of renewable energy sources on local electricity markets. Analysis of various factors influencing technological solutions and cooperation of different market parties are key components for developing effective management strategies and ensuring the stability of the electric power system.
 The peculiarities of the analysis of energy exchange processes in local electric power systems with the determination of exchange capacities, which are integral characteristics of the influence of various factors of the non-acidity of electricity on exchange processes, are considered. It is proposed to balance the components of electric energy on the basis of exchange processes in controlled intersections of local electric power systems using the components of instantaneous power at each energetically constant state. The exchange processes in local electric power systems are analyzed with the selection of different modes of their operation, in particular, when assessing the level of electromagnetic compatibility of the elements of the local electric power systems.
 The introduction of exchange capacities made it possible to develop indicators for assessing the level of electromagnetic compatibility of the elements of the local system. To estimate the share of consumers' contribution to the deterioration of the quality of electricity at the common connection point, an algorithm for evaluating the mutual influence of elements is proposed, with the allocation of the element's contribution to the distortion of electricity in the controlled intersection and the analysis of the magnitude of the influence of distorting factors on electromagnetic processes in the system element.
 An optimization model for achieving the specified levels of balancing (flexibility) in local electric power systems with energy accumulators has been developed.","PeriodicalId":472481,"journal":{"name":"Energetika. Ekonomìka, tehnologìï, ekologìâ","volume":"74 S2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135545166","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}