POWER ENGINEERING: economics, technique, ecology http://energy.kpi.ua/ <p>The journal "POWER ENGINEERING: economics, technique, ecology" (Short title: Power Eng.: Econ., Tech., Ecol) is the scientific professional publication of Ukraine in the field of technical sciences. Scientific direction - energy and energy efficiency.</p> <p>Registration number of the certificate on the state registration of the printed mass media of КВ №22857-12775ПР dated 14.06.2017.</p> <p>Category of readers: scientists, specialists on the subject of the journal, postgraduate students, students.</p> <p>Frequency of release: 4 times a year.</p> <p>Year of foundation: 2000.</p> <p>ISSN: 1813-5420 (Print), 2308-7382 (Online).</p> <p>Founder National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute". It is published according to the decision of the Scientific Council of NTUU "KPI".</p> <p>Publisher National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute".</p> <p>Publication language: Ukrainian and English.</p> <p>Editor in chief Yu.I. Yakimenko</p> <p>The journal is included in the list of professional editions of Ukraine in which the results of dissertation papers for obtaining the scientific degrees of a doctor and a candidate of sciences may be published in accordance with the Resolution of the Presidium of the Higher Attestation Commission of Ukraine dated 24.09.2020. No. 1188.</p> <p>The journal is included in:</p> <p>- Databases "Scientific Periodicals of Ukraine" NBUV;</p> <p>- the Ukrainian abstract journal "Dzherelo" (IPRI NAS of Ukraine);</p> <p>- electronic archive of scientific and educational materials of NTUU "KPI" ELAKPI;</p> <p>- Scientific periodicals of Ukraine URAN (OJS);</p> <p>- Google Scholar Scientific Search Engine;</p> <p>- WorldCat, BASE, Polska Bibliografia Naukowa, Academic Keys.</p> NATIONAL TECHNICAL UNIVERSITY OF UKRAINE “IGOR SIKORSKY KYIV POLYTECHNIC INSTITUTE” en-US POWER ENGINEERING: economics, technique, ecology 1813-5420 <p><span style="text-decoration: underline;">Автори, які публікуються у цьому журналі, погоджуються з наступними умовами:</span></p><ol type="a"><li>Автори залишають за собою право на авторство своєї роботи та передають журналу право першої публікації цієї роботи на умовах ліцензії <a href="http://creativecommons.org/licenses/by/3.0/" target="_new">Creative Commons Attribution License</a>, котра дозволяє іншим особам вільно розповсюджувати опубліковану роботу з обов'язковим посиланням на авторів оригінальної роботи та першу публікацію роботи у цьому журналі.</li></ol><ol type="a"><li>Автори мають право укладати самостійні додаткові угоди щодо неексклюзивного розповсюдження роботи у тому вигляді, в якому вона була опублікована цим журналом (наприклад, розміщувати роботу в електронному сховищі установи або публікувати у складі монографії), за умови збереження посилання на першу публікацію роботи у цьому журналі.</li></ol><ol type="a"><li>Політика журналу дозволяє і заохочує розміщення авторами в мережі Інтернет (наприклад, у сховищах установ або на особистих веб-сайтах) рукопису роботи, як до подання цього рукопису до редакції, так і під час його редакційного опрацювання, оскільки це сприяє виникненню продуктивної наукової дискусії та позитивно позначається на оперативності та динаміці цитування опублікованої роботи (див. <a href="http://opcit.eprints.org/oacitation-biblio.html" target="_new">The Effect of Open Access</a>).</li></ol> MODELING OF THE PROCESS OF ELECTROMECHANICAL CONTROL OF GAS DISTRIBUTION OF AN ELECTRIC ENERGY GENERATOR WITH AN INTERNAL COMBUSTION ENGINE http://energy.kpi.ua/article/view/242160 <div class="page" title="Page 7"> <div class="layoutArea"> <div class="column"> <p>The use of generators at different load levels allows you to use part of the rated power of the engines, by reducing the speed of the internal combustion engine, thus reducing fuel consumption and increase the overall efficiency of the system as a whole. However, it should be noted that the optimal operation of the internal combustion engine at fixed gas distribution parameters is possible only at a certain engine speed. Reducing the engine speed leads to a deterioration of the filling of the fuel-air mixture and the release of exhaust gases from the engine, accompanied by the intake of exhaust gases into the intake manifold and the emission of part of the fuel</p> <div class="page" title="Page 8"> <div class="layoutArea"> <div class="column"> <p>mixture into the exhaust pipe. The paper presents the results of the study of generator parameters and the general concept of creating an autonomous power supply control system based on an internal combustion engine in order to reduce the specific indicators of electricity generation. The expediency of regulating the power level of an internal combustion engine has been experimentally proved. To achieve this goal, it is proposed to adjust the opening and closing angles of the internal combustion engine with a solenoid valve. The use of this system allows to reduce the specific costs by more than 4 times when generating electricity with low generator load. Based on the phase distribution diagram of the internal combustion engine, the dependence of the change of the opening and closing angles of the inlet and outlet valves on the power of the autonomous energy source is proposed.</p> </div> </div> </div> </div> </div> </div> S. Zaichenko S. Korol V. Opryshko D. Derevyanko N. Zhukova Copyright (c) 2021 2021-10-11 2021-10-11 1 51 58 10.20535/1813-5420.1.2021.242160 FREQUENCY CHARACTERISTICS OF ELECTRICAL MACHINES WITH A MESH WINDING DURING HEAT-AND-MOISTURE AGING http://energy.kpi.ua/article/view/242164 <div class="page" title="Page 8"> <div class="section"> <div class="layoutArea"> <div class="column"> <p>Operation of an electric drive with damages in power electric circuit of the motor stator results in asymmetry</p> </div> </div> <div class="layoutArea"> <div class="column"> <p>of the motor phase current charge, increase of heating losses in certain phases, occurrence of variable components of electromagnetic torque and consumed power. An electric motor stator winding consists of a number of stator bars and overhang connections. Due to the complicated winding structure and the steel core, the attenuation and distortion of a pulse transmitted through the winding are complicated, and frequency-dependent. A low voltage impulse method and digital analysis techniques to determine the frequency characteristics of the winding are described. The frequency characteristics of electric motor stator windings are discussed in some detail. The analysis presented in this chapter could be applied to other rotating machines such as low voltage motors. An experiment of damping of electric motor wilding was conducted. Changes in frequency characteristics after the cycle are shown. In this article an analysis of the frequency characteristics of low-voltage electric machines with mush-wound windings, taking into account the processes of successive destruction of the insulation structure by the influence of heat-wet cycles. It is shown that the frequency characteristics can be generalized by the parameter of the state of isolation in the conditions of periodic monitoring of the quality of insulation during regulatory audits. It is proved that the frequency characteristics taken in idle and short-circuit modes have diagnostic features of the level of insulation destruction during humidification, which consist of shifting the characteristics of extremes into the region of lower frequencies, as well as reducing the area under the curve between the minimum and maximum extrema of the characteristic.</p> </div> </div> </div> </div> V. Chumak O. Timoshuk Е. Monakhov А. Vishnevsky А. Stulishenko Copyright (c) 2021 2021-10-11 2021-10-11 1 59 66 10.20535/1813-5420.1.2021.242164 DATABASE OF CERTIFICATES OF ENERGY EFFICIENCY OF BUILDINGS IN UKRAINE: ANALYSIS FOR NEW CONSTRUCTION http://energy.kpi.ua/article/view/242123 <div class="page" title="Page 6"> <div class="layoutArea"> <div class="column"> <p>Ukraine is an energy dependent country. The largest energy consumer in Ukraine is the household sector and industry. The technical characteristics of most existing serial buildings in Ukraine do not meet modern requirements for energy consumption. One of the tools to influence the reduction of consumption of construction resources is the introduction into the regulatory framework of requirements for improving energy efficiency. With the entry into force of the Law of Ukraine "On Energy Certification of Buildings", the development of an energy certificate has become mandatory for new buildings, state-owned buildings, local government buildings and in case of attracting public funds for thermal modernization of buildings. The energy certificate is developed by a certified energy auditor and entered into an open database in the Unified State System in the field of construction. The energy certificate contains an energy efficiency class determined by calculation according to the methodology of the national standard, which is developed taking into account European approaches to the calculation of energy</p> <div class="page" title="Page 7"> <div class="layoutArea"> <div class="column"> <p>consumption for different needs of buildings. The generalized analysis of the data from the available certificates is of considerable interest for estimating the characteristics of enclosing structures, engineering systems and equipment and the actual and estimated specific energy consumption of different types of buildings. In this study, the authors focused on the energy efficiency of new buildings (starting in 2019). The following indicators of residential and public buildings were analyzed: heat transfer resistance of external walls and translucent structures, specific energy consumption, primary energy, specific CO2 emissions, energy efficiency class. It was determined that the potential for energy savings compared to similar buildings in the European Union is significant, so improving the energy efficiency of the construction sector is an extremely important issue in Ukraine.</p> </div> </div> </div> </div> </div> </div> V. Deshko M. Shovkaliuk Yu. Kuzmyna Copyright (c) 2021 2021-10-11 2021-10-11 1 20 26 10.20535/1813-5420.1.2021.242123 TRAINING OF SPECIALISTS IN ENERGY CERTIFICATION AND INSPECTION OF ENGINEERING SYSTEMS OF BUILDINGS IN THE IGOR SIKORSKY KYIV POLYTECHNIC INSTITUTE http://energy.kpi.ua/article/view/242126 <div class="page" title="Page 5"> <div class="layoutArea"> <div class="column"> <p>European integration is a strategic direction for the development of our country's foreign policy. In pursuance of the Association Agreement between Ukraine and the European Union, a plan for the implementation of the European Parliament Directive on the energy performance of buildings (2010/31/EU) has been developed, which provides for the introduction of energy certification of buildings as a type of energy audit. Given the significant energy consumption in Ukraine compared to other countries, improving the energy efficiency of the buildings is an extremely important objective. The greatest effect in the existing buildings is achieved only in the case of integrated implementation of energy saving measures for fencing structures, utilities and equipment, and such projects require significant funds. To obtain funding from various investment funds and to be able to participate in state or local funding programs, it is necessary to perform an energy audit and justify energy saving measures, to assess the energy efficiency class of the building. The result of the implementation of measures will be a reduction in the total consumption of energy resources, as well as the cost of paying for them, improving the conditions of the microclimate. Institute of Energy Saving and Energy Management of Igor Sikorsky Kyiv Polytechnic Institute has many years of successful experience in training specialists in the area of energy and improving the energy efficiency of industry and utilities. On basis of the Training Center for Energy Management, advanced training courses have been introduced for specialists who intend to carry out activities on certification of energy efficiency and inspection of engineering systems of buildings. Energy certificates of buildings are mandatory for new buildings, state-owned buildings, local government buildings and in case of attracting public funds for complex thermal modernization. In this paper highlighted the experience, reveals the content of the curriculum for training, retraining and advanced training of energy auditors and presents the results of the Attestation Commission of the Igor Sikorsky Kyiv Polytechnic Institute.</p> </div> </div> </div> S. Denysiuk O. Kotsar M. Shovkaliuk Copyright (c) 2021 2021-10-11 2021-10-11 1 27 32 10.20535/1813-5420.1.2021.242126 TECHNICAL FEATURES OF USING A COMPLEX WIND-SOLAR POWER SUPPLY SYSTEM OF AN ENERGY-EFFICIENT HOUSE http://energy.kpi.ua/article/view/242128 <div class="page" title="Page 1"> <div class="layoutArea"> <div class="column"> <p>The wish to achieve energy savings of organic fuel while reducing the negative man-made impact on the environment, especially in the context of global warming, encourages for the search for new approaches in the construction of energy efficient houses and buildings. Analysis of the accumulated meteorological data on wind and solar potentials in Kyiv shows that in an urban city it is possible to create a fully autonomous house, which will be supplied with electricity using solar and wind energy. Year-round monitoring of atmospheric parameters such as current values of wind speed and direction, relative humidity and barometric air pressure was carried out using a portable meteorological station TFA Nexus using appropriate Primus software, which allowed to collect and analyze measurement data. Data on insolation for the location of the energy-efficient house were obtained experimentally in 2019 using measurements with a pyranometer SR-U1. The developed system consists of a wind generator, solar modules, charge controllers, inverters and batteries. The calculation of electricity production by the solar station was performed in the PVSyst program according to meteorological data Meteonorm. At the same time, it should be noted that the energy contribution from photomodules is crucial for the power supply of an energy-efficient house. The proposed instrumental methods for determining the parameters of insolation provide an opportunity to assess its technically available potential for a given area, as well as to use the obtained data for the design of complex power supply systems using energy of wind and solar. The research results prove that in the conditions of the city of Kyiv there are potential opportunities for the creation of residential buildings with zero energy balance, in which, for the purpose of power supply, wind generators and solar modules can be used quite successfully.</p> </div> </div> </div> B. Basok O. Nedbailo I. Bozhko M. Tkachenko Copyright (c) 2021 2021-10-11 2021-10-11 1 33 38 10.20535/1813-5420.1.2021.242128 ANALYSIS OF THE INFLUENCE OF AIR EXCHANGE DISTRIBUTION BETWEEN ROOMS ON THE APARTMENT ENERGY CONSUMPTION http://energy.kpi.ua/article/view/242133 <div class="page" title="Page 11"> <div class="section"> <div class="layoutArea"> <div class="column"> <p>Modern results of Ukrainian buildings energy analysis show that 30-50% of the energy for heating goes to heat the supply air, and that is the largest share in the building energy balance. In terms of energy consumption, efficiency of the air exchange mode largely depends on occupancy schedule and air distribution in time and space. The application of air exchange schedule approach makes more sense in case when individual heating control is carried out. Therefore, during occupied hours, the comfortable ventilation level can be ensured, and, during unoccupied hours, it can be reduced to a minimum. According to the results of the study, the use of intermittent air exchange mode in the studied apartment on weekdays, leads to decrease in energy consumption compared to constant air exchange at the level of upper values of the ventilation schedule. In terms of energy efficiency, the use of the constant air change rate from ASHRAE Std 62 is the most efficient approach. In terms of indoor air quality and concentration of CO2 and VOCs, the scheduled air exchange approach with increased air change rates (from EN 16798) during occupied hours is more efficient. Therefore, the use of required and experimental air change rate values to create the hourly schedules allows to define more precisely a building energy consumption and to choose an optimal operation schedule for building engineering systems to provide thermal comfort and indoor air quality during occupied hours.</p> </div> </div> </div> </div> V. Deshko I. Bilous I. Sukhodub O. Yatsenko Copyright (c) 2021 2021-10-11 2021-10-11 1 39 50 10.20535/1813-5420.1.2021.242133 PROBLEMS OF PHYSICS AND GEOPOLITICS IN GLOBAL WARMING http://energy.kpi.ua/article/view/242188 <div class="page" title="Page 14"> <div class="layoutArea"> <div class="column"> <p>Introduction. Global warming and so-called the “greenhouse effect” is one of the most discussed problems of physics and geopolitics, which has caused protest environmental movements in the world.</p> <div class="page" title="Page 15"> <div class="layoutArea"> <div class="column"> <p>Problem Statement. Widely discussed are both anthropogenic (the emission of greenhouse gases into the atmosphere) and the natural concepts of global warming with the dramatic effects of climate change on the planet and individual regions.</p> <p>Purpose. Evaluate the state of the problem, to present the results of research and measures to possible reduction of the greenhouse effect.</p> <p>Materials and Methods. Authoritative literary sources were used to analyze anthropogenic and natural factors of global warming, including an explanation of the processes from physics that manifest themselves during solar-geomagnetic activity.</p> <p>Results. Ways and directions of increasing the efficiency of energy use to reduce greenhouse gas emissions are identified.</p> <p>Conclusions. The greatest potential for increasing energy efficiency in the use of energy resources, and thereby reducing greenhouse gas emissions, lies in the heat supply sector of the country's housing and municipal sector. Prospects for further research are related to the development and implementation of organizational, economic and technological innovations in this energy sector.</p> </div> </div> </div> <p>&nbsp;</p> </div> </div> </div> B. Basok Ye. Baseyev Copyright (c) 2021 2021-10-11 2021-10-11 1 108 124 10.20535/1813-5420.1.2021.242188 MODEL OF EVALUATION THE FEASIBILITY OF INDUSTRIAL CUSTOMERS TO HOURLY ACCOUNTING OF RETAIL ELECTRICITY MARKET http://energy.kpi.ua/article/view/242186 <div class="page" title="Page 9"> <div class="layoutArea"> <div class="column"> <p>The main differences in pricing and tariffing for industrial consumers of electricity with different forms of electricity metering are considered. Based on the analysis of tariff formation for the final consumer of electricity, components are identified that have a significant impact on the results of solving the problem of assessing the feasibility of the consumer's transition to hourly electricity metering. Such components include the cost of purchasing electricity in the market segment "day ahead" and the cost of accrued imbalances. The relative daily profile of electricity consumption is considered in order to study the influence of the features of the daily load schedule on the weighted average daily market price of electricity. The importance of estimating the cost of daily load profiles when comparing the cost of electricity for the consumer in the group with integrated electricity metering and in terms of individual hourly metering is substantiated. The effect of underestimation of volumes and value of imbalances in the group with integrated electricity metering in comparison with hourly accruals of volumes and value of imbalances is theoretically substantiated. The main components for comparative assessment of the expediency of the consumer's exit from the group with integrated metering of electricity and the transition to its hourly metering according to the individual daily load schedule are identified. Mathematical models for comparative calculations are developed. The use of these models allows to make an economically justified decision on the expediency of the consumer leaving the group without hourly metering of electricity to the model of purchasing electricity with hourly metering. The main approaches to such an assessment are demonstrated on the example of calculations for an industrial enterprise in some regions of Ukraine. Bibl. 15, fig. 3.</p> </div> </div> </div> I. Blinov E. Parus V. Miroshnyk P. Shymaniuk V. Sychova Copyright (c) 2021 2021-10-11 2021-10-11 1 88 97 10.20535/1813-5420.1.2021.242186 PECULIARITIES OF USING TARIFFS FOR INTERRUPTION IN THE CONDITIONS OF THE ELECTRICITY MARKET OF UKRAINE http://energy.kpi.ua/article/view/242187 <p>The use of schedules to disconnect consumers from electricity to reduce the load on the UES of Ukraine is an outdated model and may not meet the standards and requirements of the new model of the electricity market in Ukraine. The study of consumer desires and needs is a very promising area in improving the efficiency of the balancing mechanism in the electricity market and is an important factor in calculating interruption tariffs. In this paper, to minimize costs due to power outages, the consumer considers the creation of a hybrid econometric approach that combines the advantages and minimizes the disadvantages of two models: the popular consumer survey model and the econometric model. An econometric model that uses the added value created by a group of consumers for the year is a practical way to estimate the cost of planned outages. The method of consumer surveys is the most popular tool for assessing reliability in the electricity market. The paper proposes to use publicly available consumer data collected through a simple survey of consumers about their actions in case of undesirable power outages, taking into account the specifics of their work. It is worth noting that this study focuses on the interruption scenario that will lead to the highest shutdown costs, it covers only winter outages in the afternoon and eliminates the effect of the difference between time of day and season.</p> A. Zamulko O. Ishchenko Copyright (c) 2021 2021-10-11 2021-10-11 1 98 107 10.20535/1813-5420.1.2021.242187 DEVELOPMENT OF POSSIBILITIES OF THE METHOD OF INDIVIDUAL COMPONENTS FOR ANALYSIS OF MODES IN ELECTRICAL SMART- COMPLEXES http://energy.kpi.ua/article/view/242102 <div class="page" title="Page 12"> <div class="layoutArea"> <div class="column"> <p>The peculiarities of the formation of the local power system according to the concept of Smart Grid requires a qualitatively new architecture of the power supply system and new principles of operation - both at the level of technical solutions and mechanisms of organizational interaction at the technological level and financial calculations. The scientific and technical problems connected with functioning of separate types of electrotechnical Smart-complexes (ETK-Smart) are analyzed, features of the analysis of electrotechnical complexes with nonlinear elements by the analysis of processes in case of changes of active and reactive loadings that allows to consider corresponding changes of parameters at calculations of electromagnetic processes using analytical methods. The methodology for assessing the impact of conductive periodic interference on the flow of the steady state in electrical Smart-complexes has been improved. The principles of analysis (modeling) of ETC- Smart as systems with periodically changing parameters are considered. It is shown that the use of ETC-Smart requires meticulous attention to the analysis of steady-state and transient, including modulated, modes, in the case of formation of different schedules of energy and technological processes, power supply of various types of loads, etc. Algorithms for calculating currents in electrical complexes with cyclically variable parameters, as well as analysis of the influence of periodic conductive interference in ETC-Smart elements with power converters based on the development of the capabilities of the method of individual components in modeling steady-state modules. Thus, algorithms for analysis of electromagnetic processes in ETC-Smart with variable parameters and RL-load for complex periodic, system analysis in case of nonlinear elements, analysis of internal resistance of generator and transmission lines, analysis of processes in abrupt change of parameters of reactive elements (inductance L) and capacitance C), analysis of the influence of periodic conductive interference (AC and DC) on electromagnetic processes in the elements of ETC-Smart with power converters The basics of methodological support for assessing the energy efficiency of ETC-Smart as elements of intelligent power supply systems are presented. The algorithm of electrotechnical inspection (energy audit) of electrotechnical complexes by application of the offered analytical expressions and the generalized algorithm of calculation of electromagnetic processes in electric complexes with cyclically variable parameters is offered that allows to carry out the corresponding estimations of energy efficiency of functioning. The concept of formation (construction) and modernization of optimization of elements of Smart-technologies for the Smart-microdistrict of the intellectual city by development of algorithm of realization of the corresponding researches and estimations and formation of the Microgrid network (ETC-Smart with power converters) of several levels of hierarchy is offered. and assessment of the general energy efficiency indicators of the Smart-microdistrict of the intellectual city. The presented examples of analysis confirm the effectiveness of the modification of the method of individual components for the analysis of steady-state ETC-Smart.</p> </div> </div> </div> S. Denysiuk M. Kolomiichuk H. Melnychuk Copyright (c) 2021 2021-10-11 2021-10-11 1 7 19 10.20535/1813-5420.1.2021.242102 ASSESSMENT OF THE MICROORGANISMS POTENTIAL FOR BIODESTRUCTION OF MOTOR FUELS WITH DIFFERENT CHARACTERISTICS http://energy.kpi.ua/article/view/242191 <div class="page" title="Page 6"> <div class="layoutArea"> <div class="column"> <p>The transport industry is characterized by a significant impact on the environment by waste from its activities, including motor fuels. The most common pollutants in soils and water bodies, especially urban ones, are hydrocarbons, especially toxic aromatic hydrocarbons. The presence of these toxicants degrades the environment and adversely affects the life and health of living organisms. Therefore, the characterization of the impact of motor fuels on the activity of microorganisms with biodestructive potential is important for the controlled disposal of waste transport infrastructure. The article considers the possibility of using different microorganisms to clean soils and reservoirs from contamination by motor fuels with different characteristics by biodegradation. The biodestructive potential of environmentally friendly microorganisms and recovery procedures in case of industrial pollution of petroleum products have also been studied.</p> </div> </div> </div> І. Shkilniyk S. Boichenko S. Shamanskyi О. Vovk Copyright (c) 2021 2021-10-11 2021-10-11 1 125 131 10.20535/1813-5420.1.2021.242191 APPLICATION OF HUMATIC REAGENT FOR DUST DESTRUCTION AND DEGASATION IN MASS EXPLOSIONS http://energy.kpi.ua/article/view/242194 <div class="page" title="Page 4"> <div class="layoutArea"> <div class="column"> <p>The work is devoted to the coverage of the results of research and industrial tests of environmental efficiency of water replacement in internal and external hydraulic wells in the quarries of mining enterprises for humic reagent [1]. Scientific and technical problem of determining environmental efficiency, solved by conducting in 2020 by the Research Mining Institute (NDGRI KNU) industrial research in the conditions of PJSC "Northern Mining and Processing Plant" (PJSC "PIVNGZK", Kryvyi Rih) kg / dust3 kg rocks) and gas formation (kg / kg BP) during mass explosions with the use of water in the holes in comparison with the use of humic reagent. Dust- binding and degassing properties of humate-based reagents are confirmed by the results of research and industrial tests conducted by the Research Institute of Occupational Safety and Ecology in the Mining and Metallurgical Industry (NDIBPG KNU) in 2019 by conducting experiments with pre-wetting blocks before conditions of quarries of Inguletskyi, Central and Northern GZK [1]. According to the results of experimental and industrial tests, it is substantiated that the efficiency of the use of humic reagent in the external water hammer in comparison with the use of technical water was: dust suppression increases by 20.0%; neutralization of carbon monoxide - 59.4%; neutralization of nitrogen oxides - 55.1%.</p> </div> </div> </div> V. Shchokin О. Shchokina Copyright (c) 2021 2021-10-11 2021-10-11 1 132 136 10.20535/1813-5420.1.2021.242194 METHODS OF SEARCHING FOR ANOMALIES IN THE DATA PROVIDED BY MODE PARAMETERS MEASUREMENTS OF THE ELECTRIC NETWORK http://energy.kpi.ua/article/view/242169 <div class="page" title="Page 5"><img src="http://energy.kpi.ua/public/site/images/aleksa172/blobid0.png" alt="page5image50857664" width="425.520000" height="11.280000"> <div class="layoutArea"> <div class="column"> <p>The materials of the article are an overview of the problems of development of electric power systems in the context of data collection and processing of mode parameters and analytical review of methods of search and detection of anomalies in data of synchronized vector measurements of mode parameters of electric network. The&nbsp;classification of anomalies, problems that arise during their search, classification of methods of search and detection of anomalies, as well as modern methods of finding anomalies in the data of synchronized vector&nbsp;measurements of power systems are considered.</p> </div> </div> </div> O. Yandulskiy O. Bukhanenko Copyright (c) 2021 2021-10-11 2021-10-11 1 67 73 10.20535/1813-5420.1.2021.242169 FORMATION OF FUNCTIONAL PLASMA SPRAYED COATINGS WITH COMPLEX OF IMPROVED PHYSICAL, MECHANICAL AND OPERATIONAL PROPERTIES http://energy.kpi.ua/article/view/242179 <div class="page" title="Page 6"> <div class="layoutArea"> <div class="column"> <p>The possibility of increasing the complex of physical, mechanical and operational properties of plasma sprayed coatings from powders of the PG-19M-01 and PRH18N9 grades due to the electric pulse effect on the heterophase high-temperature flow during spraying and next surface plastic deformation of the deposited coatings by shot blasting has been investigated. It is shown that shot blasting provides the formation of a hardening layer with a thickness of up to 180...200 μm, while the maximum level of microhardness is observed at a depth of about 60 μm. The microhardness of the coating from PG-19M-01 powder at the point of maximum hardening increases by 35%; steel coatings from PR-H18N9 powder – by 48% compared to the state after spraying. Experimental studies of the effect of this treatment on the bond strength and wear resistance of the obtained coatings have been carried out. It is shown that after shot-blasting the bond strength of the coatings decreases by 10...15%, and the wear resistance increases by 32...38%.</p> </div> </div> </div> А. Karpechenko M. Bobrov Copyright (c) 2021 2021-10-11 2021-10-11 1 74 80 10.20535/1813-5420.1.2021.242179 CRITICAL FLOW PREDICTION MODELS FOR THE COOLANT AT SUPERCRITICAL PARAMETERS http://energy.kpi.ua/article/view/242182 <div class="page" title="Page 6"> <div class="layoutArea"> <div class="column"> <p>An interest of the problems of various thermophysical and hydrodynamic phenomena in the nuclear industry, determined by the real application in the field of analysis of the accident scenarios related to the loss of coolant accident. For the generic super critical water reactor the meaning of the problem at the initial stage of the critical flow process, is the existing of the uncertainty in the accepting boundary conditions to predict the flow characteristics. The article provides an analytical review of existing approaches for describing the critical flow phenomenon of the medium and to focus on the current predictive models. A description of the physical nature of such a phenomenon is provided. The scope of consideration includes information from the literature for single and two-phase flow, taking into account their physical basis and the assumptions made. The task of the work was to analyze the information found and to evaluate and update the data on the application of the models to obtain the critical characteristic. It was supposed to highlight the physical aspects and peculiarities of this phenomenon, as applied to the coolant at supercritical parameters. To formulate important requirements to the representative critical flow model for the possibility of its use in the system codes for evaluation of the nuclear safety problems of promising fourth generation nuclear reactors.</p> </div> </div> </div> D. Fedorov V. Tuz S. Klevtsov Copyright (c) 2021 2021-10-11 2021-10-11 1 81 87 10.20535/1813-5420.1.2021.242182