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ELECTROENERGETICS
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ANALISYS OF THE EFFICENCY OF THE SOURCES OF ELECTRIC AND THERMAL ENERGY IN VIEW OF SPECIFIC FUEL CONSUMPTION
Authors: Vitaly Postolaty, Elena Bicova, Institute of Power Engineering of the Academy of Sciences of Moldova
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Abstract: Methodological approach to the evaluation of specific energy consumption of the primary fuel for electricity and heat for the various types of power plants is designed. Method of reduction electrical energy to a thermal unit is offered. Analysis of changes specific energy consumption for different shares of electric and heat energy in the total production of energy is held. Advantages of combined cycle power plants are shown. |
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Keywords: specific consumption of primary energy, condensing power plants, gas turbines, combined-cycle plants.
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MULTILEVEL CONVERTERS FOR MICROWELDING BASED ON M-ARY SYSTEM
Authors: V. Zhuikov, V. Spivak, T. Tereshchenko, J. Yamnenko, V. Bezhenar, Department of Industrial Electronics, National Technical University of Ukraine “Kyiv Polytechnic Institute”, Kyiv, UkraineM.Tirsu (Institute of Power Engineering of the ASM)
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Abstract: Multilevel converter constructing and functioning principles are given. Two different approaches to increase efficiency are described. Both decisions are compared with typical applications, so advantages and drawbacks are specified. |
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Keywords: multilevel converter, microwelding.
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ANALYSIS OF INDICATORS OF RELIABILITY OF ELECTRICAL NETWORKS
Authors: Popescu V.Agrarian University of Moldova
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Abstract: Problems of the optimization reliability in electrical networks of the different class of voltage have probabilistic nature, they discretely change and depend on the number of factors both definite and indefinite and have importance by selection of electric equipment, graph of development of electrical networks and voltage levels. The definition of the major factors, which have determining significance on their value and speed of their change allow to elaborate methods of their optimization and to elaborate effective methods of their growth limitation in electrical networks with the different class of voltage. |
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Keywords: functioning reliability; reliability indicators; the random factors; analysis of refusals in electrical networks.
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SOME UNUSUAL SOLUTIONS FOR EUROPEAN NETWORKS
Authors: Vernescu V., Goia M.L., Golovanov N.CNR/WEC- Bucharest, Romania
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Abstract: Authors present several non-conventional solutions unused in Europe which are, however, frequently adopted in some medium (M) and low (L) voltages (V) networks from North-American and Australian countries, especially in low density areas of consumption in rural and urban distribution. The proposed solutions may assure diversified supply possibilities in our middle and South–Eastern regions, as regards modernizing and upgrading the distribution networks. The solutions try to propose to adapt our European practice to the North-American experience, aiming at developing more flexible, cheaper and safer supply of the consumers, both at MV and at LV networks. Several original solutions promoted in Romanian networks and their peculiarities are also described. The paper presents distribution schemes at medium voltage in connection with low voltage supply in different condition of neutral treatment at MV or LV. It also shows the measures to be adopted in order to diminish the investment expenses in low voltage at the supplied consumers. The technical condition of co-existence of OHEL at MV and LV on the same poles, without jeopardizing the LV equipment, is necessary. Among the solutions proposed, the authors also describe the unconventional one, consisting in the supply of isolated monophase consumer at MV by ground return and also the conditions necessary for sure and safe operation of this particularly connection. Finally, there are shown some conclusions about the necessity to assure imposed environmental conditions. |
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Keywords: consumers supply, small transformers, schemes, safety operation.
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THERMOENERGETICS
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ANALYSIS OF THE IMPACT PROPERTIES OF THE COOLANT RECOVERY SYSTEM HEAT LOSSES OF COMBINED COMPRESSOR-POWER PLANT ON ITS CHARACTERISTICS
Authors: YUSHA Vladimir, CHERNOV German, RAYKOVSCKY Nicolay Omsk State Technical University
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Abstract: The paper presents results of theoretical analysis of the effectiveness of an ideal thermodynamic cycle internal combustion engine combined with an external utilization of exhaust heat. The influence of the properties of the coolant circuit of utilization on its operational parameters and characteristics of the power plant. |
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Keywords: working cycle, heat recovery, heat transfer.
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MULTIFUNCTIONAL ALTERNATIVE ENERGY SYSTEMS ON THE BASIS OF GAS-LIQUID SOLAR COLLECTORS
Authors: Doroshenko A.V., Antonova A.R. Educational and Research Institute Refrigeration, Сriotehnology and Eco-EnergyOdessa National Academy of Food Technologies
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Abstract: The basic circuits of multifunctional solar systems of drainage of air, heating (hot water supply and heating), cooling and air conditioning are developed on the basis of open absorption cycle with direct absorbent regeneration. The basic solutions for new generation of gas-liquid solar collectors are developed. |
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Keywords: multifunctional systems, solar energy, solar collectors, regeneration, film flow.
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AUTOMATIC CONTROL SYSTEM FOR HEAT PUMP EMBEDDED IN INSTALLATION FOR PASTEURIZATION AND COOLING OF MILK, part I
Authors: Sit M.L., Sit B.M.Institute of Power Engineering of the Academy of Sciences of Moldova
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Abstract: A heat pump scheme embedded into the installation for pasteurization and cooling of milk products is developed. A scheme of gas cooler automatic control system is considered. Methods of autonomous control of heat pump gas cooler and evaporators are presented as well. |
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Keywords: heat pump, installation for pasteurization and cooling, dairy products, thermodynamic cycle, carbon dioxide, automatic control system.
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MOBILE COMPLEX FOR CATALYTIC THERMAL WASTE TREATMENT
Authors: Vedi V.E., Rovenskii A.I.National Technical University „Kharkov Polytechnic Institute”, Ukraine
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Abstract: The design and purpose of the basic units of the mobile waste processing complex “MPK” are described. Experimental data of catalytic purification of exhaust gases are presented. Experimental data on catalytic clearing of final gases of a designed mobile incinerator plant are shown. It is defined, that concentrating of parasitic bridging in waste gases of the complex are considerably smaller, rather than allowed by normative documents. |
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Keywords: municipal solid waste, mobile waste processing complexes, catalysis, exhaust gas.
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INNOVATIVE TECHNOLOGIES DEVELOPED FOR RENEWABLE ENERGY SOURCES
Authors: Strebkov D.S., Kharchenko V.V. All-Russian Institute for Electrification in Agriculture
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Abstract: The All-Russia institute for electrification in agriculture (VIESH) is one of leaders in the field of use in practice of renewable technologies. In the paper the description of some executed in VIESH workings out in the field of renewable power, suitable for practical realisation in Republic Moldova is submitted. |
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Keywords: renewable energy sources, solar power, biofuel, solar modules, matrix solar cells, concentrators of solar radiation.
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SOLID BIOMASS GASIFICATION AND THE COST OF THE SYNGAS
Authors: SOLID BIOMASS GASIFICATION AND THE COST OF THE SYNGASGHERMAN Cristina, ŞVEŢ Olga, ARSENI Lucia Technical University of Moldova
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Abstract: There has been determined the cost of syngas produced from straw and wood chips, for gasifiers of different capacities, under the conditions of the Republic of Moldova in this paper. The annual cost growth rates have been calculated. The levelized cost of syngas has been compared with the levelized cost of natural gas. |
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Keywords: solid biomass, gasification, syngas, growth rate, levelized cost.
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EXPRESS-EVALUATION OF THE EFFICIENCY OF IMPLEMENTATION OF ENERGY SAVING ACTIVITIES
Authors: Litvin V.I., Institute of Energy Saving Problems, NTU, KPI, Kiev, Ukraine
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Abstract: Pre-analyze algorithm of estimation the energy conservation measures results is described in the article. It based on the Kohonen neural networks and allows making conclusions about the savings and needed costs using the statistic data about the similar projects |
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Keywords: energy efficiency, express-evaluation.
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