Heat Power Engineering Research Articles

Оптимизация регулирующих воздействий на основе дифференцированного подхода к управлению качеством атмосферного воздуха и риском здоровью населения

The study focuses on substantiating the most optimal regulatory actions aimed to minimize health risks caused by airborne exposures within Rospotrebnadzor activities including the Clean Air Federal project and the ongoing experiment on setting quotas for emissions. The aim of this study was to comparatively assess effectiveness of regulatory actions as regards specific subjects (exemplified by heat-power engineering objects) with or without use of differentiated approaches to managing ambient air quality and health risks. We analyzed a database on priority sources of ambient air pollution in an analyzed area; performed a hygienic assessment of ambient air quality relying on computed data and also estimated contributions made by specific chemicals and objects to the total pollution; calculated population health risks; implemented an algorithm for substantiating optimal regulatory actions aimed to mitigate health risks under airborne exposures; comparatively analyzed activities stipulated by the Complex plan and suggested optimal regulatory actions identified by solving the optimization task. We conducted a reconnaissance stage-by-stage assessment of effectiveness of air protection activities over 2019–2023 relying on hygienic indicators and risk levels. As a result, we established that implementation of air protection activities and a reduction in total emissions of more than 20 pollutants by heat-power engineering objects would not ensure significant improvement of environmental conditions in the analyzed area considering their share contributions. Safe standards would still be violated in residential areas with levels of chemicals reaching 6.25 single MPL and 7.0 average annual MPL. An optimal sufficient result, considering this share contribution, would be a reduction in emissions from all heat-power engineering objects by 3.47 thousand tons of 10 specific chemicals. This is lower than a reduction planned within the Complex plan on total emission reduction (18.1 thousand tons). To ensure conformity with safe standards that stipulate chemical levels in ambient air and to achieve permissible risk levels, it is necessary to apply a differentiated approach to reductions in emissions (by 1.06 thousand tons overall), which targets specific chemicals, at other sources of ambient air pollution. Use of a differentiated approach to selecting optimal regulatory actions as regards all sources of ambient air pollution considering their share contributions will make it possible to define priority environmental protection activities, adjust the Complex plans and ensure conformity with safe standards and permissible risk levels in all residential areas.

Optimization of regulatory actions based on a differentiated approach to managing ambient air quality and health risks

The study focuses on substantiating the most optimal regulatory actions aimed to minimize health risks caused by airborne exposures within Rospotrebnadzor activities including the Clean Air Federal project and the ongoing experiment on setting quotas for emissions. The aim of this study was to comparatively assess effectiveness of regulatory actions as regards specific subjects (exemplified by heat-power engineering objects) with or without use of differentiated approaches to managing ambient air quality and health risks. We analyzed a database on priority sources of ambient air pollution in an analyzed area; performed a hygienic assessment of ambient air quality relying on computed data and also estimated contributions made by specific chemicals and objects to the total pollution; calculated population health risks; implemented an algorithm for substantiating optimal regulatory actions aimed to mitigate health risks under airborne exposures; comparatively analyzed activities stipulated by the Complex plan and suggested optimal regulatory actions identified by solving the optimization task. We conducted a reconnaissance stage-by-stage assessment of effectiveness of air protection activities over 2019–2023 relying on hygienic indicators and risk levels. As a result, we established that implementation of air protection activities and a reduction in total emissions of more than 20 pollutants by heat-power engineering objects would not ensure significant improvement of environmental conditions in the analyzed area considering their share contributions. Safe standards would still be violated in residential areas with levels of chemicals reaching 6.25 single MPL and 7.0 average annual MPL. An optimal sufficient result, considering this share contribution, would be a reduction in emissions from all heat-power engineering objects by 3.47 thousand tons of 10 specific chemicals. This is lower than a reduction planned within the Complex plan on total emission reduction (18.1 thousand tons). To ensure conformity with safe standards that stipulate chemical levels in ambient air and to achieve permissible risk levels, it is necessary to apply a differentiated approach to reductions in emissions (by 1.06 thousand tons overall), which targets specific chemicals, at other sources of ambient air pollution. Use of a differentiated approach to selecting optimal regulatory actions as regards all sources of ambient air pollution considering their share contributions will make it possible to define priority environmental protection activities, adjust the Complex plans and ensure conformity with safe standards and permissible risk levels in all residential areas

Prospects for the use of lithium bromide and lithium chloride absorption heat pumps of the step-up type in heat power engineering and industry

The article discusses the possibilities of using a step-up absorption heat pumps in autonomous heating systems and in industry. A system of autonomous heating with a step-up heat pump is proposed, where the energy source is geothermal water with a temperature of 40 °C, and the surrounding winter air with negative temperatures is used to remove heat from the heat pump. Calculations were made of heat pump cycles for working fluids – LiBr and LiCl absorbents. As a result of cycle calculations, energy efficiency indicators were determined - transformation coefficients. The transformation coefficients for LiBr and LiCl are comparable and range from 0.46 to 0.48. Thus, it has been established that the use of LiCl as an alternative working fluid is promising.

ДОСЛІДЖЕННЯ ВИКОРИСТАННЯ АЛЬТЕРНАТИВНИХ ВИДІВ ПАЛИВА НА ПОЛТАВЩИНІ

The possibilities of using energy-resource solid household waste, agricultural waste, logging waste from forestry enter-prises, green waste from landscaping and growing energy crops as alternative renewable fuels to meet the goals of small-scale heat and power generation in Poltava Oblast are investigated. To study this issue, the specialists from the Departments of Applied Ecology and Nature Management and Heat and Gas Supply, Ventilation and Heat Power En-gineering of National University "Yuri Kondratyuk Poltava Polytechnic" were invited to join the project and a new specialization "Renewable Heat and Power Engineering, Alternative Fuels and Environmental Protection" was opened in the specialty 183 "Environmental Protection Technologies". The problem was included in the strategic development plan of Poltava region and included in the development of the Action Plan for Sustainable Energy Development and Climate of Poltava City Territorial Community until 2030 in accordance with the European initiative "Covenant of Mayors for Climate and Energy". The assessment of the bioenergy potential may become a significant environmental and economic basis for improving the regional bioenergy sector in Poltava Oblast in the future. A complex of methods of system analysis and the method of data analysis has been applied to achieve the goal of the research. An analysis of modern international literary sources, an analysis of the morphological composition of municipal and green waste, and an analysis of the energy potential of plant biomass were reviewed. As a result of research, the scientific and applied task of using local energy resources at the level of each individual community of the Poltava region, taking into account ecological, economic and social development, has been formulated and substantiated. Ref. 10, figure. Keywords: energy security, environmental security, alternative fuels, renewable energy sources, energy crops, solid household waste, small-scale energy, environmental impact.

Environmentally safe sorbent from ash-and-slag waste of heat power engineering

Objectives. To determine the physical and chemical properties (bulk density, ash content, total pore volume, abrasion, humidity, sorption capacity) of sorbent based on ash-and-slag waste from heat power engineering, calcined and modified with a Tiprom K organosilicon water repellent.Methods. The physicochemical properties of the modified sorbent were determined using an experimental method according to the methods of regulatory documents on equipment verified and certified in the prescribed manner.Results. Ash and slag taken from the ash dump of the Novocherkasskaya GRES power station were dried, then calcined at a temperature of 600 °C for 30 min and modified with a Silor hydrophobizing silicon-containing liquid (HSL). The modifier/ash ratios (by weight) were 1:20, 1:10, 1:5, 1:3, and 1:2. The optimal ratio was 1:5 at a sorption capacity with respect to hexane of 0.86 g/g. The modification temperature was optimized in the temperature range of 110–200 °C. The optimal approach it to dry samples at 160 °C to constant weight. At a temperature of 200 °C, sintering of the material was observed. The analysis of HSL modifiers was carried out in terms of the price/sorption properties ratio. The following were considered as HSL: Silor, HSL-11BSP, HSL 136-157M, PROFILUX, Tiprom K, Tiprom U. The optimal modifier Tiprom K was selected. The physicochemical properties of the modified sorbent obtained at a ratio of 1:5 (by weight) and dried at 160 °C were experimentally determined. The sorption properties were studied on the water surface with respect to various oil products: fuel oil, kerosene, AI-92 gasoline, nefras, oil sludge, and n-hexane. The smallest sorption capacity was obtained with respect to n-hexane, amounting to 0.86 g/g. During the experiment, it was found that half of the sorption capacity was filled with oil in the first minutes of contact. Complete sorption time was 30–40 min for relatively light hydrocarbons (n-hexane, AI-92 gasoline, kerosene, nefras), 40–60 min for oil sludge, and more than 60 min for fuel oil. Experiments established that the sorption process does not depend on the matrix (salinity) of water. A visual assessment of the color intensity of the residual spot of oil sludge allowed a conclusion to be made about a significant content of oil products in the case of sorption of oil sludge by quartz sand based on the residual yellow layer of oil sludge. In the case of sorption of oil sludge by calcined and modified sorbents, the residual oil products were insignificant. A comparative analysis of data on the effectiveness of the developed sorbent and currently available analogues based on sludge and slag is presented.Conclusions. The next physicochemical properties of the sorbent modified with HSL Tiprom K were determined: bulk density was 0.621 g/mL, ash content was 97.1%, total pore volume by water was less than 0.05 mL/g, attrition was 8.8%, humidity was less than 0.5%; sorption capacity, in g/g: for n-hexane, 0.86; for AI-92 gasoline, 0.89; for nefras, 0.93; for kerosene, 0.99; for oil sludge, 1.18; for fuel oil, 1.46. The efficiency of cleaning a solid surface from oil sludge with a calcined sorbent was 97%, and with a modified sorbent 95%. The modified sorbent has high buoyancy when saturated with oil products and the ability to retain them for a long time.

Influence of industrial emissions from heat power engineering enterprises on the absorption of solar radiation in the atmosphere

Influence of industrial emissions from heat power engineering enterprises on the absorption of solar radiation in the atmosphere

Расчет конструктивных параметров мультицилиндрового теплового генератора на основе течения Куэтта–Тэйлора

Direct conversion of wind energy into heat is a relevant direction for the development of alternative heat power engineering. The paper considers an efficient wind heat generator that consists of two rotors nested in each other's annular gaps and forming a system of cylindrical coaxial annular channels filled with a viscous working fluid. Depending on the properties of the working fluid, the velocity of the rotors, the number of annular channels and their geometry, there are combinations of parameters for the optimal design of the heat generator. The proposed method for selecting the design parameters of coaxial rotors makes it possible to directly select the optimal design of rotors for a given power of the heat generator and the properties of a viscous working fluid. The design of the multi-cylinder system of the heat generator, which uses the annular Couette–Taylor flow, is presented in the form of an equivalent single annular gap, which made it possible to generalize the results of investigations carried out with different working fluids under various conditions, in the form of a single dependence of the dimensionless power of the heat generator on the number Reynolds. The obtained dependence is well approximated by a linear function in the experimentally studied range of Reynolds numbers. An algorithm for calculating the geometric design parameters of a multi-cylinder annular system is proposed. As an example, calculations of the structural dimensions of nine variants of heat generators for three power values are given: 10 kW, 20 kW and 50 kW.

Impact of Hydrodynamic Cavitation on the Properties of Coal-Water Fuel: An Experimental Study.

It is common to use coal as raw material in heat power engineering. A number of shortcomings of coal such as ignitability cannot be easily eliminated. The use of water-slurry-based coal-water fuel instead of coal eliminates this problem. The coal-water fuel (CWF) is liquid fuel, which means that the main line of investigation is to study its sedimentation and rheological properties responsible for the transport and atomization in the boiler and thermal-physical properties which determine the expedience and efficiency of its application. The paper shows that the final performance properties of suspended coal fuel can be determined at the stage of CWF preparation by hydrodynamic treatment of aqueous coal slurry. The rheological and sedimentation properties and combustion parameters of water-coal fuel, ignition time of the drop, its completeness of combustion, and amount of man-made emissions, have been studied. Studies have been carried out on coals from the Kansk-Achinsk coal basin (Russia). The studies were performed under laboratory conditions with a hydrodynamic rotary mixer, making it possible to attain cavitation effects in the processed medium. Two CWF types have been considered: the first was produced by cavitation dispersion of the solid coal fraction in distilled water, and the second was produced in analogy, but the dispersion medium was water pretreated by cavitation. The paper shows that the cavitation method of producing CWF improves the rheological and sedimentation properties of the end-use fuel, reduces hazardous emissions in combustion, and affects the combustion parameters.

Development of entrepreneurial thinking of students of technical specialties based on the use of transdisciplinary didactic content of a special course in physics

Research problem. The activation of the processes of entrepreneurial specialization and updating the content of vocational education based on a transdisciplinary approach is a socio-economic order and an urgent problem of modernizing didactics. One of the philosophical prerequisites for transdisciplinarity is the philosophy of holism, which we applied to theoretically substantiate the coherence of physical and entrepreneurial thinking. The research problem is related to the need to develop transdisciplinary didactic content to improve the quality of entrepreneurial training of students. The purpose of the study is to develop a transdisciplinary didactic content of a special course in physics and fundamentals of economics for the development of entrepreneurial thinking among students of various specialties with an entrepreneurial specialization. Research methods. The study involved 156 students enrolled in the educational programs Instrument Engineering, Heat Power Engineering, Electric Power Engineering and Economics, with an entrepreneurial specialization. Determination of the level of educational achievements was carried out using online testing on the website https://dot.tou.edu.kz (Toraigyrov University) in the student's personal account and through https://docs.google.com/forms. Research results. The possibility of a convergent approach has been confirmed. This is evidenced by the results of the ascertaining experiment according to J. Bruner’s method. The hypothesis about the coherence of professional entrepreneurial and physical thinking has been confirmed. The calculation of the G-criterion of signs revealed (Gemp.< Gcr. (0<1)) that the use of the integrated didactic content of a special course in physics contributes to the development of entrepreneurial thinking. The coherence of physical and entrepreneurial thinking was verified based on the calculation of the Pearson correlation coefficient, which, with a sample of n=21 and a confidence probability of 0.05, is 0.7795. Measuring the correlation of the results of the analysis of educational achievements of the control and experimental groups made it possible to establish a close relationship between the criteria for the formation of professional entrepreneurial and physical thinking among students. Conclusion. It has been proven that the use of a transdisciplinary approach to the development of integrated didactic content in physics and the basics of economics contributes to the development of professional entrepreneurial thinking among students of technical specialties with entrepreneurial specialization.

Thermosyphon-assisted cooling system working in the moderate heat flux range

• Thermosyphon-assisted cooling system was used to remove moderate heat fluxes; • 25% filling of a thermosyphon with ethanol provides the best cooling efficiency; • A thermally insulated thermosyphon can be used, but with mixed or forced convection; • The efficiency of thermally insulated thermosyphon is lower than that of uninsulated. Ensuring the permissible temperature regime of heat-loaded and energy-saturated equipment is still an urgent problem in heat power engineering and thermal physics. In this work, it is demonstrated that thermosyphons without a boiling coolant on their lower lid can be used in practice as self-regulating heat exchangers ensuring the permissible temperature regime of heat-loaded and energy-saturated equipment. The experiments showed that heat flux in the range of 0.18–2.60 kW·m −2 can be removed from engineering heated surfaces of equipment by a self-regulating thermosyphon-assisted cooling system (TCS) with intense evaporation of a coolant (without boiling) on its lower lid and air cooling of the condenser due to natural convection. Using modern tools for registration of thermophysical and hydrodynamic processes, the effect of the coolant type, the filling ratio of evaporator and the presence of thermal insulation on the side surface of a TCS on its efficiency was studied. To increase the efficiency of the thermally insulated TCS, it is advisable to create mixed or forced convection above the upper lid with the heat transfer coefficient of 22–53 W·m 2 ·K −1 . It was hypothesized that the heat transfer intensity in the TCS characterizing by the temperature distributions and evaporation rates depends on heat transfer and convection in the liquid layer on the lower lid of the TCS.

DESIGN OF DYNAMIC NONLINEAR INTELLIGENT CONTROL SYSTEM FOR SIGNAL PROCESSING

Based on back propagation neural network (BPNN), we design a dynamic nonlinear intelligent control system for signal processing and analysis in this work. Performances of the traditional PID and BPNN control systems is compared in a case of heat power engineering system design. In the design, the training times, regulation time of the BPNN control system are evaluated when [Formula: see text] and [Formula: see text], respectively. Furthermore, the regulation time, oscillation time and amplitude of the traditional PID and BPNN control systems are compared in the dead zone. Results of the comparison show that the BPNN based dynamic nonlinear intelligent control system demonstrates superior performances over the traditional PID control system. The research results prove the advantage of BPNN in the design of nonlinear control systems and provide a scientific and effective reference for the follow-up research works.

Investigation of Soils and Pine Needles Using WDXRF and TXRF Techniques for Assessment of the Environmental Pollution of Shelekhov District, Eastern Siberia, by the Aluminum Industry and Heat Power Engineering

X-ray fluorescence analysis was applied to assess the ecological state of the area potentially polluted by emissions of the aluminum industry and heat power engineering. Soil and pine needle samples were collected in areas with industrial activity and analyzed using wavelength-dispersive X-ray fluorescence (WDXRF) and total-reflection X-ray fluorescence (TXRF) techniques. Both techniques were validated using the matrix-matched certified reference materials. Different sample preparation procedures, such as fusion and pressing for WDXRF and acid digestion and suspensions for TXRF as well as quantification approaches (the external calibration for WDXRF and the internal standard for TXRF) were applied according to the features of the analyzed samples. The rock-forming oxides (Na2O, MgO, Al2O3, SiO2, P2O5, K2O, CaO, TiO2, MnO, and Fe2O3) and trace elements (V, Cr, Ni, Cu, Zn, Rb, Sr, Y, Ba, and Pb) were quantified in soils, as well as several elements (Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, Cr, Mn, Fe, Ni, Cu, Zn, Br, Rb, Sr, Pb, and Ba) were quantified in pine needles. Comparing the results of soils and pine needles analysis with the regional background values indicated a significant contamination pollution level of the studied area.

Influence of electrode arrangement method on specific energy consumption and productivity in electrosynthesis of fine graphite powder

In this work, the influence of the location of the electrodes on the productivity of electrochemical process and specific energy consumption during direct current electrosynthesis of finely dispersed graphite powder is considered. The authors consider the possibility of using finely dispersed graphite powder obtained by electrolysis as the main component of a multifunctional aerospace coating. For this purpose, two types of devices were constructed: with a coaxial and parallel arrangement of the electrodes. The main elements of the device are a stainless steel cathode and a graphite anode immersed in electrolyte (an aqueous solution of salts). The authors consider the influence of the arrangement of the electrodes in the installation for direct current electrosynthesis from the point of view of the energy efficiency and productivity of electrochemical process. As a result of anodic oxidation, a fine powder from graphite of the MPG-6 brand was obtained. The size of the resulting graphite particles is 1–50 µm. This finely dispersed graphite powder can be used as the main component of a multifunctional coating in aircraft, since it has an even homogeneous structure, as well as higher values of the main mechanical properties of a multifunctional coating, which will lead to a decrease in the number of layers and the thickness of the coating applied. The resulting graphite powder can also be used in the production of fire-retardant and heat-insulating materials for the chemical, nuclear industry, instrumentation, and heat power engineering.

Preface

the XII All-Russian Conference “Thermophysics and Power Engineering in Academic Centers” (TPEAC 2021) October 25-27, 2021, Sochi, RussiaThe All-Russian scientific conference “Thermophysics and Power Engineering in Academic Centers“ (TPEAC-2021) continues series of conferences (workshops) on thermophysics and heat power engineering. Since the first conference until now, the principal organizer of the conference is the Kutateladze Institute of Thermophysics, SB RAS. The 1st Workshop of the University Departments and Research Teams in Siberia and the far East specializing in thermophysics was held in Novosibirsk in 1978. Since then, the geographical spread of the Conference expanded every year involving various research centers: Tomsk, 1980; Krasnoyarsk, 1982; Vladivostok, 1984; Kemerovo, 1986; Ulan-Ude, 1988. The 7th Workshop was held in Novosibirsk, September 9-12, 1990, at the Institute of Thermophysics SB RAS. Workshop of Universities in Siberia and Far East on Thermophysics and Heat Power Engineering, dedicated to the 85th Birthday of the Workshop founder, academician S.S. Kutateladze, was held in Novosibirsk, October 6-8, 1999, at the Institute of Thermophysics SB RAS, and the Novosibirsk State Technical University (NSTU). Since 1999 new series of workshops started. The 2nd Workshop was held in Tomsk, 2001, at the Tomsk Polytechnic University (TPU); 3rd - in Barnaul, 2003, at the Altai State Technical University; 4th - in Vladivostok, 2005, at the Far-East State Technical University; 5th - in Irkutsk, 2007, at the Irkutsk State Technical University. Since 2009, when the 6th Workshop was held in Krasnoyarsk at the Siberian Federal University, it acquired the status of an All-Russian conference. The 7th All-Russian Workshop of Universities on Thermophysics and Power Engineering was held in Kemerovo, 2011, at the Kuzbas State Technical University; 8th - in Yekaterinburg, 2013, at the Ural Federal University. Since 2015, when the 9th Workshop was held in Kazan, at the Kazan State Engineering University, it acquired the status of an international conference. International Conference “The 10th Workshop of Universities on Thermophysics and Power Engineering“, was held in Moscow, 2017, at the Moscow Engineering University. The 11th All-Russian scientific conference with international participation “Thermophysics and Power Engineering in Academic Centers“ (TPEAC-2019) held based on the Peter the Great St. Petersburg Polytechnic University (SPbPU), Saint Petersburg.List of “Thermophysics and Power Engineering in Academic Centers” (TPEAC 2021) October 25-27, 2021, Sochi, Russia, Editorial Committee, Organizing Committee, Scientific Committee, Members of the Scientific and Advisory Committee and this titles are available in this pdf.

ПРОГРЕСИВНА ТЕПЛОУТИЛІЗАЦІЙНА ТЕХНОЛОГІЯ ДЛЯ МОДЕРНІЗАЦІЇ ГАЗОСПОЖИВАЛЬНИХ ПАРОВИХ КОТЛОАГРЕГАТІВ

The new complex heat-recovery plant for heating and humidifying combustion air with an expanded range of heated coolants of various temperature potentials and protection of the exhaust-gas outlet duct from condensate formation for gas-fired steam boilers of municipal heat-power engineering is proposed.

Practical Application Analysis of Heat Energy and Power Engineering in Energy Saving and Consumption Reduction

Practical Application Analysis of Heat Energy and Power Engineering in Energy Saving and Consumption Reduction

The role of metallurgy and heatpower engineering department of Donetsk National Technical University in the formation and development of the region

Donetsk National Technical University, created in 1921, became a largest center of training of highly-qualified engineers and researchers. Facts of history of one of basic departments of the university – department of metallurgy and heat-power engineering presented. Its role in the forming and development of the leading Donbass industry – metallurgy – shown.

Autonomous Active Solar Energy Systems for Heat Supply in Housing and Communal Services

Energy saving in small-scale heat power engineering is directed to increasing the efficiency of using fossil energy carriers, electric power, and their wider replacement with alternative sources in housing and communal complex. The practical use of active solar energy systems, both photovoltaic and with direct water heating, has found widespread use. At the same time, the specificities of these systems deployment are caused by climatic and technical conditions of their application. For countries found in climatic zones with temperate and cold climate, water heating installations design is most rational when used seasonally. Low coolant potential, heat supply frequency in active solar energy systems, linked to seasonality of their operation, daytime and weather require several technical solutions. For example, solutions with the use of other equipment in form of thermal energy accumulators, heat pumps and other equipment, which in any case must be combined with a traditional source of thermal energy using fossil fuels or electric power, performing the functions of both other and emergency source of heat energy. Capacity reserving of alternative energy sources is most efficient and least energy-consuming when conducting with heat sources using gaseous or degasified fuel. The use of electric power for heat supply purpose, with few capital investments, requires from a developer significant installed capacities of heat source with a low efficiency for primary fuel. In the article one considers thermal schemes of autonomous heat supply installations for objects using modern condensing boilers of low power and along them various heat cumulating devices, supplying full year operation of equipment at heat supply facilities to get the highest efficiency of energy use.

Composite Сarbonaceous Сoal-Water Suspensions

In Ukraine, up to 75% of all electricity is supplied by thermal power plants, the main type of fuel for which is coal, which leads to the release of ash and slag waste at power plants in huge quantities. Every 10 years (according to statistical data) the amount of ash and slag produced at thermal power plants doubles. The use and creation of new modified consumers of coal-water fuel (CWF) and coal-water suspensions (CWS) occurs periodically. The ease of handling suspensions is captivating: in the energy sector, they can serve as the basis for the effective disposal of numerous accumulated wastes from coal preparation and oil refining, a significant reduction in the consumption of minerals for generating heat and electric energy, and minimizing the effect of heat power engineering on public health and the state of nature.

Integral Equations Related to Volterra Series and Inverse Problems: Elements of Theory and Applications in Heat Power Engineering

The paper considers two types of Volterra integral equations of the first kind, arising in the study of inverse problems of the dynamics of controlled heat power systems. The main focus of the work is aimed at studying the specifics of the classes of Volterra equations of the first kind that arise when describing nonlinear dynamics using the apparatus of Volterra integro-power series. The subject area of the research is represented by a simulation model of a heat exchange unit element, which describes the change in enthalpy with arbitrary changes in fluid flow and heat supply. The numerical results of solving the problem of identification of transient characteristics are presented. They illustrate the fundamental importance of practical recommendations based on sufficient conditions for the solvability of linear multidimensional Volterra equations of the first kind. A new class of nonlinear systems of integro-algebraic equations of the first kind, related to the problem of automatic control of technical objects with vector inputs and outputs, is distinguished. For such systems, sufficient conditions are given for the existence of a unique, sufficiently smooth solution. A review of the literature on these problem types is given.