Energija, ekonomija, ekologija最新文献_第5页

Program energetske efikasnosti HIP-Petrohemija Pančevo

Energija, ekonomija, ekologija Pub Date : 1900-01-01 DOI: 10.46793/eee21-1.56s

Biljana Suslov, Miša Bulajić

{"title":"Program energetske efikasnosti HIP-Petrohemija Pančevo","authors":"Biljana Suslov, Miša Bulajić","doi":"10.46793/eee21-1.56s","DOIUrl":"https://doi.org/10.46793/eee21-1.56s","url":null,"abstract":"Energy efficiency program of HIP-Petrohemija a.d. Pancevo 2020-2022 is a planning document that expresses the planning of energy consumption and improvement of energy efficiency of the system in the next three years, as compliance with the Law on Efficient Use of Energy (Official Gazette of RS, No. 25/2013) and in accordance with the goals of the Energy Development Strategy of the Republic of Serbia. In the period from 2013-2019, investment programs were implemented in HIPP and planned overhauls of all plants were realized, whereby several planned business projects were realized with the aim of raising energy efficiency. About 42 million euros were invested in capital projects and investment maintenance, while about 35 million euros were spent on current maintenance and plant overhaul, all financed from own sources. The set of measures and actions for risk management for the survival and sustainability of petrochemical plants are investments in strategic modernization projects and projects to increase production capacity with the installation of energy efficient equipment. The energy efficiency program references the implemented energy improvements in the previous period and the planned business improvements in the following period, all with the aim of continuously improving the energy efficiency of the HIP-Petrohemija plant.","PeriodicalId":236996,"journal":{"name":"Energija, ekonomija, ekologija","volume":"175 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124294304","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}

引用次数: 0

Simulacija i odstranjivanje stick-slip efekta servosistema sprovodnog aparata hidraulične turbine

Energija, ekonomija, ekologija Pub Date : 1900-01-01 DOI: 10.46793/eee21-1.37b

Darko Babunski, Emil Zaev, Atanasko Tuneski, Laze Trajkovski, Radmila Koleva

{"title":"Simulacija i odstranjivanje stick-slip efekta servosistema sprovodnog aparata hidraulične turbine","authors":"Darko Babunski, Emil Zaev, Atanasko Tuneski, Laze Trajkovski, Radmila Koleva","doi":"10.46793/eee21-1.37b","DOIUrl":"https://doi.org/10.46793/eee21-1.37b","url":null,"abstract":"Friction is a repeatable and undesirable problem in hydraulic systems where always has to be a tendency for its removal. In this paper, the friction model is presented through which the most accurate results are achieved and the way of friction compensation, approached trough technique presented with the mathematical model of a hydraulic cylinder of a hydro turbine wicket gate controlled by a servomechanism. Mathematical modelling of a servo mechanism and hydraulic actuator, and also the simulation of hydraulic cylinder as a part of a hydro turbine wicket gate hydraulic system where the stick-slip phenomenon is present between the system components that are in contact is presented. Applied results in this paper and the theory behind them precisely demonstrate under what circumstances the stick-slip phenomenon appears in such a system. The stick-slip effect is simulated using Simulink and Hopsan software and the analysis of the results are given in this paper. Removal of the stick-slip effect is presented with the design of a cascade control implemented to control the behaviour of the system and remove the appearance of a jerking motion.","PeriodicalId":236996,"journal":{"name":"Energija, ekonomija, ekologija","volume":"501 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129969909","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}

引用次数: 0

Značaj monitoringa kvaliteta vode u jezerima hidroelektrana

Energija, ekonomija, ekologija Pub Date : 1900-01-01 DOI: 10.46793/eee21-1.29ro

Vladana Rajaković-Ognjanović, Tina Dašić

{"title":"Značaj monitoringa kvaliteta vode u jezerima hidroelektrana","authors":"Vladana Rajaković-Ognjanović, Tina Dašić","doi":"10.46793/eee21-1.29ro","DOIUrl":"https://doi.org/10.46793/eee21-1.29ro","url":null,"abstract":"When planning the construction of a hydroelectric power plant, an important segment is adequate monitoring of water quality. With an appropriate monitoring program, the multifunctional use of artificial lakes is enabled. Eutrophication (nutrient over-enrichment) of water in a lake is a phenomenon that has been noticed in all lakes. The consequence of eutrophication is the endangerment of the aquatic ecosystem. Eutrophication is a phenomenon that occurs as a response of the aquatic ecosystem to the increased concentration of nutrients, phosphorus (P) and nitrogen (N), due to natural and anthropogenic activities. Recent research indicates a correlation between local climate change and water circulation and the impact of climate change on all phenomena in the hydrological cycle. Temperature fluctuations, huge amounts of rain when precipitation is analysed, constant heating and increase in humidity all affect more intense eutrophication. The key conclusions of the research dealing with the construction of the hydroelectric power plant in Komarnica are: to introduce monitoring (permanent control) of water quality in lakes in order to minimize or control, even prevent eutrophication. Each artificial lake has its own unique characteristics. The dependence of chlorophyll, phosphorus and lake volume varies depending on the month, season and year. The proposal for the lake that will be built on Komarnica, which is part of the future hydroelectric power plant, is a monthly monitoring of the concentration of chlorophyll, nutrients and the volume of the lake. Seasonal monitoring depends on precipitation, hydrological and limnological characteristics and trends of dry and rainy episodes. Analyzes and previous research have shown that the introduction of mandatory parameters for monitoring water quality does not increase the cost of electricity production and energy conservation, but significantly improves and enhances the quality of the environment.","PeriodicalId":236996,"journal":{"name":"Energija, ekonomija, ekologija","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125021539","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}

引用次数: 0

Application of CFD and Artificial Intelligence for Prediction of Biomass Particle Burnout and Residence Time in the Reactor 应用CFD和人工智能预测生物质颗粒在反应器中的燃烬和停留时间

Energija, ekonomija, ekologija Pub Date : 1900-01-01 DOI: 10.46793/eee22-1.40z

M. Žarković, Vladimir Antonijević, Aleksandar Milićević, Srđan V. Belošević

{"title":"Application of CFD and Artificial Intelligence for Prediction of Biomass Particle Burnout and Residence Time in the Reactor","authors":"M. Žarković, Vladimir Antonijević, Aleksandar Milićević, Srđan V. Belošević","doi":"10.46793/eee22-1.40z","DOIUrl":"https://doi.org/10.46793/eee22-1.40z","url":null,"abstract":"In planning the development of the energy sector, increasing attention is paid to renewable energy sources, such as biomass. The process of (co)combustion of biomass in boiler furnaces is extremely complex with many coupled parameters. Because of that, the development and application of computational fluid mechanics and artificial intelligence are approached, as efficient tools for the analysis of physical and chemical processes that take place during combustion. The paper presents the applied CFD code and the methodology of application of adaptive neuro-fuzzy systems (ANFIS) in the field of machine learning for predicting the biomass particle burnout and residence time in a 150 kW reactor. Test cases for combustion of three types of pulverized biomass with different diameters and shape factors were considered. A database with the values of mass burnout and residence time of particles was obtained by means of numerical simulations using the in-house developed computer code. The results of ANFIS application on the formed base indicate the possibility of a reliable assessment of mass burnout and residence time of particles, based on knowledge of the type, diameter and shape factors of the fuel introduced into the furnace. The presented models represent a good basis for the implementation and application of CFD and ANFIS models at various thermal energy plants, in order to assess the efficiency of fuel combustion in the furnace.","PeriodicalId":236996,"journal":{"name":"Energija, ekonomija, ekologija","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130571947","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}

引用次数: 0

Moguća uloga hidrosistema „Lim-Zapadna Morava“ u obezbeđivanju elektroenergetske, privredne i društvene sigurnosti i stabilnosti u Srbiji

Energija, ekonomija, ekologija Pub Date : 1900-01-01 DOI: 10.46793/eee22-3.25s

Vladimir Šiljkut, R. Cabarkapa, A. Latinović, Jovana Ilić, Dragan Surudžić

{"title":"Moguća uloga hidrosistema „Lim-Zapadna Morava“ u obezbeđivanju elektroenergetske, privredne i društvene sigurnosti i stabilnosti u Srbiji","authors":"Vladimir Šiljkut, R. Cabarkapa, A. Latinović, Jovana Ilić, Dragan Surudžić","doi":"10.46793/eee22-3.25s","DOIUrl":"https://doi.org/10.46793/eee22-3.25s","url":null,"abstract":"Increased climate changes and environmental pollution cause a decrease of available quality water quantities and increase differences in precipitation amounts by seasons. The question is how to provide sufficient quantities of water to supply the population, agriculture, industry, and electricity generation. Sources of quality water are most often located in areas far from the centers of consumption, so it is necessary to construct large water management systems. In order to mitigate the variations in the available quantities of water during the year, reservoirs of significant, seasonal capacity must be built. The power system stability is additionally endangered by the growing impact of renewable sources with extremely variable electricity generation, which is manifested both on an intraday and seasonal level. Therefore, seasonal accumulations, with multi-purpose and even multiple use of the same amount of water, represent a winning option and a stronghold on which power supply, economic and social security and stability should be built. In the case of Serbia, apart from seasonal ones, there are also a spatial differences in the quantities and quality of water in the river basins. In the areas of Zapadna and Velika Morava, Šumadija, Kolubara and Belgrade, the required quantities of water for the supply exceed their own resources. On the other hand, the Drina basin is rich in water of significantly higher quality, and the possibilities of leveling the waters of river Lim are extremely limited. This paper reaffirms the old idea of building a multi-purpose hydro system „Lim-Zapadna Morava“, which would solve these problems. Beside those in power industry, other positive effects that would be achieved by the realization of this strategic project are also presented in this paper.","PeriodicalId":236996,"journal":{"name":"Energija, ekonomija, ekologija","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131095247","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}

引用次数: 0

Komparativna analiza tehničkih, ekonomskih i ekoloških pokazatelja različitih modela prozjumera sa fotonaponskim panelima na primeru zgrade Tehničkih fakulteta u Beogradu

Energija, ekonomija, ekologija Pub Date : 1900-01-01 DOI: 10.46793/eee21-4.08s

Bojana Škrbić, Željko Đurišić

{"title":"Komparativna analiza tehničkih, ekonomskih i ekoloških pokazatelja različitih modela prozjumera sa fotonaponskim panelima na primeru zgrade Tehničkih fakulteta u Beogradu","authors":"Bojana Škrbić, Željko Đurišić","doi":"10.46793/eee21-4.08s","DOIUrl":"https://doi.org/10.46793/eee21-4.08s","url":null,"abstract":"The paper analyses different prosumer models with photovoltaic (PV) panels as local sources of electricity. The calculations were performed on the example of the building of the Technical Faculties in Belgrade, for which data on consumption and available roof surfaces for the installation of photovoltaic panels were available. The analyses included three models of prosumers. The first model assumes that the maximum available power of the PV panel production does not exceed the corresponding power consumption. The second model assumes that the maximum available power of PV panel production can be higher than the peak power of the building, but the production is limited by prohibiting counter flow of power. The third model assumes that the installed power of the PV panels is equal to the approved power, whereby it is assumed that the user distributes excess energy to the distribution network. For all analysed models, the calculation of the installed power of PV panels and inverters was performed, as well as the economic valorization through various indicators. The optimal models were considered based on the obtained calculation results and carbon dioxide emission reduction was calculated for each of the solution. It has been shown that investing in prosumers designed according to the optimal first and second model is already profitable in Serbia, while to encourage the development of prosumers according to the third model, it is necessary for the government to create appropriate financial instruments.","PeriodicalId":236996,"journal":{"name":"Energija, ekonomija, ekologija","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122352495","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}

引用次数: 0

Rеkоnfigurаciја distributivnе mrеžе primеnоm mеtоdе pоmеrајućеg rеgistrа оtvоrеnih prеkidаčа

Energija, ekonomija, ekologija Pub Date : 1900-01-01 DOI: 10.46793/eee21-2.11s

Dаrkо Šоšić, Тоmislаv Rајić, Branko Stојаnоvić

引用次数: 0

Analiza kapaciteta i uslova izgradnje fotonaponskih sistema na krovovima školskih objekata u Srbiji

Energija, ekonomija, ekologija Pub Date : 1900-01-01 DOI: 10.46793/eee20-1-2.021b

Iva Batić, Željko Đurišić

{"title":"Analiza kapaciteta i uslova izgradnje fotonaponskih sistema na krovovima školskih objekata u Srbiji","authors":"Iva Batić, Željko Đurišić","doi":"10.46793/eee20-1-2.021b","DOIUrl":"https://doi.org/10.46793/eee20-1-2.021b","url":null,"abstract":"School and school gym buildings represent a relevant potential for construction of photovoltaic panels, to be integrated into roofs of these buildings. Given that roof structures are passive, construction of photovoltaic systems does not interfere with the building functionality, does not it in any way adversely affect the environment. Installation of photovoltaic systems on building roofs brings the production and consumption of electricity closest possible, therefore such systems ensure significant reduction in power losses in transmission and distribution grids. In addition to locally produced electricity, construction of photovoltaic systems on the school buildings’ roofs produces an educational effect as well. By installing a measuring and acquisition system which would include the measuring data on the photovoltaic power plant production parameters and school electricity consumption into school labs, technology would be closer to students, as well as possibilities to meet the demand for electricity from this basic renewable energy source. This paper presents the results of evaluations of the available roof surfaces of school buildings in Serbia for the photovoltaic panels installation. For each category of school building, an estimate of possible annual production per unit of average roof area was made. Summarizing all the results, estimates of possible installed capacity and annual electricity production for different scenarios are given.","PeriodicalId":236996,"journal":{"name":"Energija, ekonomija, ekologija","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127755237","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}

引用次数: 0

Analiza zagrevanja bakarnih provodnika sa strujom

Energija, ekonomija, ekologija Pub Date : 1900-01-01 DOI: 10.46793/eee21-1.16kl

Karolina Kasaš-Lažetić, Gorana Mijatović, Dejana Herceg, Miroslav Prša

{"title":"Analiza zagrevanja bakarnih provodnika sa strujom","authors":"Karolina Kasaš-Lažetić, Gorana Mijatović, Dejana Herceg, Miroslav Prša","doi":"10.46793/eee21-1.16kl","DOIUrl":"https://doi.org/10.46793/eee21-1.16kl","url":null,"abstract":"The method for the temperature measurement on the surface of three copper conductors, with cross-sections of 4 mm2 , 6 mm2 i 10 mm2 , are presented in this paper. After the determination of temperature probe, the series of temperature measurements are performed on chosen wire conductors. The first two series are performed applying DC generator, in two different cases: when, during the measurement the voltage on the conductor’s end was held constant and the current inside the conductor was held constant. After that, the temperature measurements on the conductor’s surface were performed supplying conductors with AC, time harmonic currents, again in two particular cases: constant RMS voltage value on the conductor’s ends and constant RMS value of current inside the conductor. The measuring results were expected for all four cases and for all thee conductors. Due to presence of skin effect, the Joule’s losses were higher in the AC cases, meaning that the temperature increase was faster and that the final reached temperature, for the same values of voltage or currents, was higher. It was also demonstrated that the higher Joule’s losses appeared when the current was kept constant during the measurements, in both DC and AC supplying. The measurements were performed with the instrument which enabled the results recording on USB stick; hence the measurements duration was 30 minutes, recording result every two seconds. The measuring results were presented graphically, together with graphical presentation of the comparison between methods and the results for all investigated conductors.","PeriodicalId":236996,"journal":{"name":"Energija, ekonomija, ekologija","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132238413","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}

引用次数: 0

Definition of the Optimal Generation Mix in Decarbonized Power System 脱碳电力系统最优发电组合的定义

Energija, ekonomija, ekologija Pub Date : 1900-01-01 DOI: 10.46793/eee22-1.22r

Vladan Ristić, Miljan Žikić, D. Vujanović, I. Trkulja, Ognjen Mijušković

{"title":"Definition of the Optimal Generation Mix in Decarbonized Power System","authors":"Vladan Ristić, Miljan Žikić, D. Vujanović, I. Trkulja, Ognjen Mijušković","doi":"10.46793/eee22-1.22r","DOIUrl":"https://doi.org/10.46793/eee22-1.22r","url":null,"abstract":"The development of the environmental tendencies in the previous decade led to the alteration of the way in which the perspective of the power systems is seen, where the largest number of adaptations was made to the sector of energy production, in which the role that was occupied by the thermal plants was taken over by the wind and solar plants. However, this change was met with a dose of scepticism, where the variability of the generation power of these plants and the oscillations in their daily production diagram were commonly listed as the arguments against the massive integration of these sources. What was neglected, nonetheless, is the fact that the daily production diagram depends on the type of the source, so the diagrams of the wind and solar plants, for instance, are not identical. Hence, the daily minimums and maximums of generation power of these units would not occur simultaneously, so the unified diagram of both plants would show less oscillations than their individual diagrams. The level of the variations’ reduction would depend on the ratio of the installed capacities of the plants. Therefore, the paper will contain analysis of the test system supplied from the wind and solar plants, with two types of solar panels (monofacial and bifacial) considered. The total installed capacity of these sources will be kept constant, but their share in this amount will be varied in order to define the ratio of the individual installed capacities for which the variations of the total production power on a yearly level is minimal. As the indicator of the variations’ reduction, the minimal mean square deviation of the total hourly production powers from their yearly average will be selected.","PeriodicalId":236996,"journal":{"name":"Energija, ekonomija, ekologija","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133408818","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}

引用次数: 0