The efficiency of two numerical methods for solving multidimensional problems of the theory of thermal conductivity ‒ the fractional steps method and the Liebman method - is evaluated. The efficiency of these methods is compared for the operating conditions of industrial furnaces by the example of calculating the symmetrical heating of a two-dimensional cylinder and a three-dimensional plate made of materials with different thermophysical properties (corundum, ceramic brick and carbon steel). A two-dimensional axisymmetric temperature field for a cylinder and a three-dimensional temperature field for a workpiece in the form of a parallelepiped were found by the grid method under boundary conditions of the II and III genera. The difference approximation of differential equations and boundary conditions is performed by the control volume method according to an implicit finite difference scheme. The developed algorithms for solving multidimensional problems of internal heat transfer by fractional steps and the Liebman method are implemented in the form of computer programs in the Object Pascal programming environment. When comparing the effectiveness of solving multidimensional problems with these methods, the criterion of the effectiveness of difference schemes (CERS) proposed by V.V. Bukhmirov and T.E. Sozinova was used as an optimization criterion. Nomograms are constructed to select the optimal parameters of the space-time grid and the best numerical method for solving multidimensional problems for a specific process of heating (cooling) a solid body
{"title":"SELECTION OF OPTIMAL PARAMETERS OF THE SPACE-TIME GRID IN MATHEMATICAL MODELING OF HEATING OF WORKPIECES IN INDUSTRIAL FURNACES","authors":"Vyacheslav Bukhmirov, Daria Rakutina, Ilya Svetushkov","doi":"10.34031/es.2023.1.010","DOIUrl":"https://doi.org/10.34031/es.2023.1.010","url":null,"abstract":"The efficiency of two numerical methods for solving multidimensional problems of the theory of thermal conductivity ‒ the fractional steps method and the Liebman method - is evaluated. The efficiency of these methods is compared for the operating conditions of industrial furnaces by the example of calculating the symmetrical heating of a two-dimensional cylinder and a three-dimensional plate made of materials with different thermophysical properties (corundum, ceramic brick and carbon steel). A two-dimensional axisymmetric temperature field for a cylinder and a three-dimensional temperature field for a workpiece in the form of a parallelepiped were found by the grid method under boundary conditions of the II and III genera. The difference approximation of differential equations and boundary conditions is performed by the control volume method according to an implicit finite difference scheme. The developed algorithms for solving multidimensional problems of internal heat transfer by fractional steps and the Liebman method are implemented in the form of computer programs in the Object Pascal programming environment. When comparing the effectiveness of solving multidimensional problems with these methods, the criterion of the effectiveness of difference schemes (CERS) proposed by V.V. Bukhmirov and T.E. Sozinova was used as an optimization criterion. Nomograms are constructed to select the optimal parameters of the space-time grid and the best numerical method for solving multidimensional problems for a specific process of heating (cooling) a solid body","PeriodicalId":11825,"journal":{"name":"Energy Systems","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136365222","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}
Pressure is a key parameter in the work of many industrial enterprises, including those in the energy sector. Control and monitoring of this parameter ensures a stable and trouble-free flow of technological processes carried out in the course of the activities of these enterprises. Today, there is a problem that if there is no pressure gauge on the pipe, it is impossible to determine the current pressure inside the pipeline without inserting a pressure gauge into the body of this pipeline, which is possible only during the period of maintenance and commissioning or due to the implementation rather dangerous event, called "Push under pressure." The need to create the possibility of prompt and timely control of pressure inside the pipelines of industrial enterprises is an urgent task for engineers and specialists in the field of energy. The purpose of the work: to test the hypothesis of the possibility of measuring the pressure of a liquid through the pipeline wall, based on the nature of the flow of dynamic thermal processes, to create an experimental prototype of a device that allows determining the final value of the pressure of the working fluid inside the pipeline. Results of the work: the relationship between the nature of the flow of thermal processes and the final value of pressure inside the pipeline has been established. A prototype of the device was developed and created, as well as an approbation stand, which made it possible to test the hypothesis.
{"title":"VERIFICATION OF THE HYPOTHESIS OF THE POSSIBILITY OF MEASURING LIQUID PRESSURE THROUGH A PIPELINE WALL. RESULTS OF THE STUDY","authors":"Mikhail Kobylkin, Yuliya Rikker, Il'ya Akimov","doi":"10.34031/es.2023.1.005","DOIUrl":"https://doi.org/10.34031/es.2023.1.005","url":null,"abstract":"Pressure is a key parameter in the work of many industrial enterprises, including those in the energy sector. Control and monitoring of this parameter ensures a stable and trouble-free flow of technological processes carried out in the course of the activities of these enterprises. Today, there is a problem that if there is no pressure gauge on the pipe, it is impossible to determine the current pressure inside the pipeline without inserting a pressure gauge into the body of this pipeline, which is possible only during the period of maintenance and commissioning or due to the implementation rather dangerous event, called \"Push under pressure.\" The need to create the possibility of prompt and timely control of pressure inside the pipelines of industrial enterprises is an urgent task for engineers and specialists in the field of energy. The purpose of the work: to test the hypothesis of the possibility of measuring the pressure of a liquid through the pipeline wall, based on the nature of the flow of dynamic thermal processes, to create an experimental prototype of a device that allows determining the final value of the pressure of the working fluid inside the pipeline. Results of the work: the relationship between the nature of the flow of thermal processes and the final value of pressure inside the pipeline has been established. A prototype of the device was developed and created, as well as an approbation stand, which made it possible to test the hypothesis.","PeriodicalId":11825,"journal":{"name":"Energy Systems","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136365047","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}
Continuous monitoring of the technical condition of gas turbines, defect identification, failure prevention, and optimization of operation, maintenance, and repair processes are relevant tasks for the operators of this equipment. Various machine learning methods that are already being used in the field of gas turbines can help solve these tasks. The limiting factor in this regard is the lack of real operational data. This study examines the possibility of using synthetic data for training and testing machine learning models to determine the level of technical condition of a gas turbine installation. An open dataset created by other researchers using a mathematical model of a marine gas turbine engine was selected for analysis. The research presents the accuracy values obtained by different methods of evaluating machine learning models. The random forest model demonstrated the best results. It was found that when developing machine learning-based solutions for engineering tasks, additional methods for assessing the accuracy of predictions are required. The further development of this work is associated with the development of a proprietary mathematical model of a gas turbine installation capable of considering the influence of specific defects to create datasets for analysis and further research
{"title":"EVALUATION OF THE TECHNICAL CONDITION OF A GAS TURBINE PLANT USING MACHINE LEARNING METHODS FROM ARTIFICIAL DATA ASSESSING THE TECHNICAL CONDITION OF A GAS TURBINE USING MACHINE LEARNING METHODS WITH ARTIFICIAL DATA","authors":"Vitalii Blinov, Gleb Deryabin, Svyatoslav Pankrashin","doi":"10.34031/es.2023.1.003","DOIUrl":"https://doi.org/10.34031/es.2023.1.003","url":null,"abstract":"Continuous monitoring of the technical condition of gas turbines, defect identification, failure prevention, and optimization of operation, maintenance, and repair processes are relevant tasks for the operators of this equipment. Various machine learning methods that are already being used in the field of gas turbines can help solve these tasks. The limiting factor in this regard is the lack of real operational data. This study examines the possibility of using synthetic data for training and testing machine learning models to determine the level of technical condition of a gas turbine installation. An open dataset created by other researchers using a mathematical model of a marine gas turbine engine was selected for analysis. The research presents the accuracy values obtained by different methods of evaluating machine learning models. The random forest model demonstrated the best results. It was found that when developing machine learning-based solutions for engineering tasks, additional methods for assessing the accuracy of predictions are required. The further development of this work is associated with the development of a proprietary mathematical model of a gas turbine installation capable of considering the influence of specific defects to create datasets for analysis and further research","PeriodicalId":11825,"journal":{"name":"Energy Systems","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136365224","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}
Recently, issues of increasing the environmental friendliness of technological productions, increasing the exergetic component and energy saving issues have become particularly relevant. Therefore, when organizing and designing electrical supply systems, a more correct solution is the use of an inverter-battery backup power supply system. Such a system will ensure reliable and uninterrupted operation of consumers in the building. The paper considers the solution of the problem of designing the inverter mode of the power supply system for connecting the charging station of electric vehicles to the substation of the city of Novosibirsk. The connected charger of an electric vehicle, being a non-linear load, leads not only to an increase in the load on the power grid infrastructure, but can also be a source of power supply. They can also cause a deterioration in the quality of electricity due to the generation of harmonic distortion. Therefore, special attention is paid to the influence of the inverter mode of electric vehicle charging stations on the quality of power supply to the consumer in the power system. A simulation simulation of the charging station was performed using the MATLAB Simulink software package
{"title":"THE INFLUENCE OF THE INVERTER MODE OF ELECTRIC VEHICLE CHARGING STATIONS ON THE QUALITY OF CONSUMER POWER SUPPLY IN THE POWER SYSTEM","authors":"Tatyana Myatezh, Valentina Lyubchenko, Egor Egor","doi":"10.34031/es.2023.1.007","DOIUrl":"https://doi.org/10.34031/es.2023.1.007","url":null,"abstract":"Recently, issues of increasing the environmental friendliness of technological productions, increasing the exergetic component and energy saving issues have become particularly relevant. Therefore, when organizing and designing electrical supply systems, a more correct solution is the use of an inverter-battery backup power supply system. Such a system will ensure reliable and uninterrupted operation of consumers in the building. The paper considers the solution of the problem of designing the inverter mode of the power supply system for connecting the charging station of electric vehicles to the substation of the city of Novosibirsk. The connected charger of an electric vehicle, being a non-linear load, leads not only to an increase in the load on the power grid infrastructure, but can also be a source of power supply. They can also cause a deterioration in the quality of electricity due to the generation of harmonic distortion. Therefore, special attention is paid to the influence of the inverter mode of electric vehicle charging stations on the quality of power supply to the consumer in the power system. A simulation simulation of the charging station was performed using the MATLAB Simulink software package","PeriodicalId":11825,"journal":{"name":"Energy Systems","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136365044","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}
Natural gas every year wins an increasing share in the global fuel balance. Countries where cheap natural gas is available are seeking to increase the efficiency of its use in order to increase the volume of its use. One of the most promising methods for increasing the efficiency of natural gas is the heat recovery of gas waste. The subject of the study is a gas turbine plant due to the fact that the number of power plants with gas turbines tends to increase. In this paper, options for increasing the efficiency of using natural gas in gas turbines at a constant flow rate are investigated. Variants of implementation of thermochemical heat recovery of gas wastes based on steam reforming of methane and thermal heat recovery of gas wastes based on steam generation are considered. The results of a study based on a mathematical model of a gas turbine plant using thermal and thermochemical waste gas heat recovery are presented.
A constructive calculation of the methane steam reforming reactor has been carried out. The design and regime parameters of the heat exchanger are determined. A 3D-model of the conversion reactor has been developed, which provides high gas density and the possibility of thermal elongation of heat exchange tubes
{"title":"THERMOCHEMICAL HEAT RECOVERY IN A GAS TURBINE PLANT","authors":"Mikhail Polyakov, Stanislav Popov","doi":"10.34031/es.2023.1.006","DOIUrl":"https://doi.org/10.34031/es.2023.1.006","url":null,"abstract":"Natural gas every year wins an increasing share in the global fuel balance. Countries where cheap natural gas is available are seeking to increase the efficiency of its use in order to increase the volume of its use. One of the most promising methods for increasing the efficiency of natural gas is the heat recovery of gas waste. The subject of the study is a gas turbine plant due to the fact that the number of power plants with gas turbines tends to increase. In this paper, options for increasing the efficiency of using natural gas in gas turbines at a constant flow rate are investigated. Variants of implementation of thermochemical heat recovery of gas wastes based on steam reforming of methane and thermal heat recovery of gas wastes based on steam generation are considered. The results of a study based on a mathematical model of a gas turbine plant using thermal and thermochemical waste gas heat recovery are presented.
 A constructive calculation of the methane steam reforming reactor has been carried out. The design and regime parameters of the heat exchanger are determined. A 3D-model of the conversion reactor has been developed, which provides high gas density and the possibility of thermal elongation of heat exchange tubes","PeriodicalId":11825,"journal":{"name":"Energy Systems","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136365221","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}
Improving the energy efficiency of existing capital construction projects is an important and urgent task. To improve the efficiency of operation of residential apartment buildings, an analysis of existing measures for energy and resource saving was carried out, a set of particular criteria for the effectiveness of energy-saving measures for engineering systems of buildings was proposed, and the values of savings during their implementation for four types of houses were determined. A method for assessing the comparative effectiveness of energy-saving measures using the DEA multi-criteria assessment method (Data Envelopment Analysis) is proposed. Comprehensive performance criteria are formulated for the analysis of measures for heating, water supply and electricity supply systems. The use of the DEA methodology makes it possible to optimize the choice of priority areas for the implementation of resource saving measures for all types of buildings
{"title":"MULTI-CRITERIA EVALUATION OF THE EFFICIENCY OF RESOURCE-SAVING MEASURES IN THE ENGINEERING SYSTEMS OF STANDARD BUILDINGS","authors":"Anna Gavrilova, Lyajsan Sagitova","doi":"10.34031/es.2023.1.008","DOIUrl":"https://doi.org/10.34031/es.2023.1.008","url":null,"abstract":"Improving the energy efficiency of existing capital construction projects is an important and urgent task. To improve the efficiency of operation of residential apartment buildings, an analysis of existing measures for energy and resource saving was carried out, a set of particular criteria for the effectiveness of energy-saving measures for engineering systems of buildings was proposed, and the values of savings during their implementation for four types of houses were determined. A method for assessing the comparative effectiveness of energy-saving measures using the DEA multi-criteria assessment method (Data Envelopment Analysis) is proposed. Comprehensive performance criteria are formulated for the analysis of measures for heating, water supply and electricity supply systems. The use of the DEA methodology makes it possible to optimize the choice of priority areas for the implementation of resource saving measures for all types of buildings","PeriodicalId":11825,"journal":{"name":"Energy Systems","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136365046","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}
When comparing the efficiency gross of the same units operating under different conditions, or the same unit for different periods of time, often does not take into account that these values are obtained under different conditions. It is well known that the efficiency of the boiler unit depends on the heat load of the boiler. As a rule, the value of efficiency maximum at moderate loads of the boiler unit and then with increasing heat load gradually decreases according to a law close to linear. Thus, it is possible that for a unit with a better technical condition, an efficiency value will be obtained that is lower than that of another unit operating in more favorable conditions. There is also ambiguity in the presentation of the efficiency dependence. boiler unit from heat load. The paper studies the issue of the features of using the normalized heat load to determine the level of energy efficiency of a boiler unit based on the TVG-4r boiler of a small quarterly boiler house. It is shown that a feature of using the reduced efficiency, which is determined depending on the normalized heat load, is that this indicator characterizes not only the actual technical condition of the boiler unit, but also the efficiency of its regulation, taking into account changes outside air temperature
{"title":"STUDY OF THE PECULIARITIES OF USING THE NORMALIZED THERMAL LOAD TO DETERMINE THE LEVEL OF ENERGY EFFICIENCY OF THE BOILER UNIT UNDER SPECIFIC CONDITIONS","authors":"Aleksey Biryukov, Pavel Gnitiev","doi":"10.34031/es.2023.1.002","DOIUrl":"https://doi.org/10.34031/es.2023.1.002","url":null,"abstract":"When comparing the efficiency gross of the same units operating under different conditions, or the same unit for different periods of time, often does not take into account that these values are obtained under different conditions. It is well known that the efficiency of the boiler unit depends on the heat load of the boiler. As a rule, the value of efficiency maximum at moderate loads of the boiler unit and then with increasing heat load gradually decreases according to a law close to linear. Thus, it is possible that for a unit with a better technical condition, an efficiency value will be obtained that is lower than that of another unit operating in more favorable conditions. There is also ambiguity in the presentation of the efficiency dependence. boiler unit from heat load. The paper studies the issue of the features of using the normalized heat load to determine the level of energy efficiency of a boiler unit based on the TVG-4r boiler of a small quarterly boiler house. It is shown that a feature of using the reduced efficiency, which is determined depending on the normalized heat load, is that this indicator characterizes not only the actual technical condition of the boiler unit, but also the efficiency of its regulation, taking into account changes outside air temperature","PeriodicalId":11825,"journal":{"name":"Energy Systems","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136365219","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}
A technique has been developed for obtaining highly active Pd-Pt nanocatalysts on the surface of all-metal Pd-23%Ag membranes. These coatings were a large number of pentagonally structured Pd-Pt nanoparticles with an average size of about 100 nm, designed to intensify the process of hydrogen transport. By melting and rolling with intermediate annealing, palladium-silver foils 30 µm thick were obtained, which acted as the basis of the membranes. Surface modification was carried out by electrolytic deposition with a change in the parameters of the deposition current and the composition of the working solution. Classical methods made it possible to obtain spherical particles on the surface of thin palladium-silver films. However, a decrease in the deposition current density, compared to classical methods, and a clear ratio of components in the working solution with the addition of a surfactant made it possible to obtain coatings based on particles with a special geometry. The developed materials were studied in the processes of low-temperature (25 °C) hydrogen transport as diffusion membrane filters, where they demonstrated penetrating flux density values up to 0.42 mmol/s m2 at operating pressures up to 0.3 MPa. It has been established that the density values of the hydrogen penetrating flux through membranes modified with pentatwinned Pd-Pt particles are up to 2.1 times higher than through membranes with classical palladium black. These nanocatalysts based on pentatwinned Pd-Pt particles made it possible to significantly intensify hydrogen transport at low temperatures. The developed membrane materials can become the basis for both low-temperature devices, such as a fuel cell, a hydrogen compressor, and find application as diffusion filters in steam reforming reactors
{"title":"MONO- AND BIMETALLIC PD-PT NANOPARTICLES AS AN EFFICIENT TOOL FOR THE INTENSIFICATION OF TRANSCRYSTALLINE HYDROGEN TRANSPORT","authors":"Georgy Andreev, Polina Pushankina, Stepan Dzhimak, Iliya Petriev","doi":"10.34031/es.2023.1.009","DOIUrl":"https://doi.org/10.34031/es.2023.1.009","url":null,"abstract":"A technique has been developed for obtaining highly active Pd-Pt nanocatalysts on the surface of all-metal Pd-23%Ag membranes. These coatings were a large number of pentagonally structured Pd-Pt nanoparticles with an average size of about 100 nm, designed to intensify the process of hydrogen transport. By melting and rolling with intermediate annealing, palladium-silver foils 30 µm thick were obtained, which acted as the basis of the membranes. Surface modification was carried out by electrolytic deposition with a change in the parameters of the deposition current and the composition of the working solution. Classical methods made it possible to obtain spherical particles on the surface of thin palladium-silver films. However, a decrease in the deposition current density, compared to classical methods, and a clear ratio of components in the working solution with the addition of a surfactant made it possible to obtain coatings based on particles with a special geometry. The developed materials were studied in the processes of low-temperature (25 °C) hydrogen transport as diffusion membrane filters, where they demonstrated penetrating flux density values up to 0.42 mmol/s m2 at operating pressures up to 0.3 MPa. It has been established that the density values of the hydrogen penetrating flux through membranes modified with pentatwinned Pd-Pt particles are up to 2.1 times higher than through membranes with classical palladium black. These nanocatalysts based on pentatwinned Pd-Pt particles made it possible to significantly intensify hydrogen transport at low temperatures. The developed membrane materials can become the basis for both low-temperature devices, such as a fuel cell, a hydrogen compressor, and find application as diffusion filters in steam reforming reactors","PeriodicalId":11825,"journal":{"name":"Energy Systems","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136365045","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}
The purpose of this article is to solve the problem of optimizing the operation of a hydroelectric power station based on the theory of marginal utility and assessing the cost of a hydro resource, taking into account the characteristic modes of operation of a hydroelectric power station. In this work, a universal method, which combines an optimization method and a method for assessing marginal utility. The method developed by the authors involves use the adequate representation of the incremental rate characteristic and the determination of the cost of the hydro resource for the control of the operating modes of the HPP. Using the example of the Novosibirsk HPPs and TPPs, an assessment of the energy efficiency, proposing the concept of a developed methodology for determining the price of water for HPPs, will be obtained. Based on the results of the implementation of the developed approach at Novosibirsk HPPs, the electricity sales price competitive electricity market can be matched with the electricity sales price generated at TPP, which will be approximately 370 ¢/kWh
{"title":"OPTIMIZATION OF HPP OPERATION MODES BASED ON THE THEORY OF MARGINAL UTILITY AND HYDRO RESOURCE COST ESTIMATION","authors":"Yury Sekretarev, Tatyana Myatezh, Stepan Bezmenov","doi":"10.34031/es.2023.1.001","DOIUrl":"https://doi.org/10.34031/es.2023.1.001","url":null,"abstract":"The purpose of this article is to solve the problem of optimizing the operation of a hydroelectric power station based on the theory of marginal utility and assessing the cost of a hydro resource, taking into account the characteristic modes of operation of a hydroelectric power station. In this work, a universal method, which combines an optimization method and a method for assessing marginal utility. The method developed by the authors involves use the adequate representation of the incremental rate characteristic and the determination of the cost of the hydro resource for the control of the operating modes of the HPP. Using the example of the Novosibirsk HPPs and TPPs, an assessment of the energy efficiency, proposing the concept of a developed methodology for determining the price of water for HPPs, will be obtained. Based on the results of the implementation of the developed approach at Novosibirsk HPPs, the electricity sales price competitive electricity market can be matched with the electricity sales price generated at TPP, which will be approximately 370 ¢/kWh","PeriodicalId":11825,"journal":{"name":"Energy Systems","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136365218","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}
The use of mixed uranium-plutonium fuel in thermal reactors makes it possible to effectively use highly toxic weapons-grade plutonium for peaceful purposes. The world's reserves of such plutoni-um are a serious problem. The use of this fuel in thermal reactors significantly reduces the amount of enriched uranium needed, as well as to dispose of plutonium-239. The plutonium processed in this way can be reused in fast reactors. In that way, a significant part of nuclear waste can be used in the process of energy release, and the number of potential radioactive waste that would otherwise be buried in the soil will also decrease. The paper presents the results of the neutron-physical calculation of the VVER-1000 reactor on mixed uranium-plutonium fuel for three fuel assemblies: 30%, 50% and 70% MOX fuel from the total amount of the produced substance. The total enrichment is 5%, which will not make critical changes to the reactor operation. Effective multiplication coefficients are obtained for all variations in several approximations: the 4-factor method, the multigroup approximation. The neutron spectrum for the multigroup approximation is obtained. Xenon and samarium poisoning of the reactor was calculated. The analysis of the kinetics of the reactor and the change in the neutron flux at different input reactivity is presented. The possibility of using the selected assemblies on real power plants and the degree of plutonium reproduction during reactor operation are evaluated
{"title":"NEUTRON-PHYSICAL CALCULATION OF THE VVER-1000 ON MOX-FUELED REACTOR","authors":"Mikle Egorov, Alexander Blinnikov","doi":"10.34031/es.2023.1.004","DOIUrl":"https://doi.org/10.34031/es.2023.1.004","url":null,"abstract":"The use of mixed uranium-plutonium fuel in thermal reactors makes it possible to effectively use highly toxic weapons-grade plutonium for peaceful purposes. The world's reserves of such plutoni-um are a serious problem. The use of this fuel in thermal reactors significantly reduces the amount of enriched uranium needed, as well as to dispose of plutonium-239. The plutonium processed in this way can be reused in fast reactors. In that way, a significant part of nuclear waste can be used in the process of energy release, and the number of potential radioactive waste that would otherwise be buried in the soil will also decrease. The paper presents the results of the neutron-physical calculation of the VVER-1000 reactor on mixed uranium-plutonium fuel for three fuel assemblies: 30%, 50% and 70% MOX fuel from the total amount of the produced substance. The total enrichment is 5%, which will not make critical changes to the reactor operation. Effective multiplication coefficients are obtained for all variations in several approximations: the 4-factor method, the multigroup approximation. The neutron spectrum for the multigroup approximation is obtained. Xenon and samarium poisoning of the reactor was calculated. The analysis of the kinetics of the reactor and the change in the neutron flux at different input reactivity is presented. The possibility of using the selected assemblies on real power plants and the degree of plutonium reproduction during reactor operation are evaluated","PeriodicalId":11825,"journal":{"name":"Energy Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136365220","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}
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