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ELECTRICAL POWER ENGINEERING
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ANALYSIS OF IMPACT OF UNDERLOADING OF CHP ON THE EFICIENCY OF FUEL CONSUMPTION IN MOLDOVA
Authors: Postolaty V., Bicova Е., Tsaranu М.Institute of Power Engineering of the Academy of Science of Moldova, Ministry of Environment of Republic of Moldova
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Abstract: The article presents an assessment of problems of extra-consumption of fuel resources in Moldova, as a result of underloading of CPH of national energy system, as well as, increasing share of electricity produced by condensing power plants for ensuring supply of established energy demand. It is shown that, every year, over-consumption of about 100 thou t.c.e. is observed at CHP, due to inefficient loading factor of regimes in which are forced to be operated power plants as a result of un-bounding or disconnections of some consumers of heating energy and un-coordinated policy in the field of heat supply. |
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Keywords: CHP, specific consumption, extra-consumption of fuel, under loading of power plant.
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OPTIONS FOR DEVELOPMENT OF POWER TRANSMISSIONS OF MOLDAVIAN POWER SYSTEM IN PARALLEL WITH POWER SYSTEM OF UKRAINE
Authors: L.Calinin, D. Zaitsev, M.Tirshu, I.Golub
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Abstract: The paper focuses on the analysis of possible scenarios for the future development of power transmission of Moldavian Power System in parallel operation with the Power System of Ukraine. In this case the problem is considered in the absence of synchronous connection with ENTSO-E. |
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Keywords: power transmission, interconnection, energy transfer, active and reactive power, power losses, steady-state operation.
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DESIGN METHODOLOGY OF SELF-EXCITED ASYNCHRONOUS GENERATOR
Authors: Berzan V., Birladeanu A., Tirsu M.
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Abstract: The paper sets out the methodology of designing an asynchronous generator with capacitive self-excitation. It is known that its design is possible on the basis of serial synchronous motor with squirrel cage rotor. With this approach, the design reworked only the stator winding of electrical machines, making it cost-effectively implement the creation of the generator. Therefore, the methodology for the design, optimization calculations, the development scheme and the stator winding excitation system gain, not only of practical interest, and may also be useful for specialists in the field of electrical machines in the design of asynchronous generators. |
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Keywords: methodology, induction generator, capacitive stimulation, self-excitation, a capacitor, stator winding.
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STUDY PROCESSES OF FRACTURE PRIESTESSES CONCRETE PILLARS ELECTRICAL TRANSMISSION LINES
Authors: I. Colesnic1, Gh. Croitoru2, I. Rusu3.1 Institute of Power Engineering of the ASM; 2 ICŞC „INCERCOM”Î.S.,; 3 FUA, UTM,
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Abstract: It is presented the problem of state of bearing pillars installed 20-30 years ago, which have considerable degradation, which can lead to collapse of the bearing structure of the energy system. There are analyzed priestesses concrete pillars, which are predominantly bending applications and/or torsion. These loads often cause cracks that contribute the penetration of corrosive substances in concrete, which leads to corrosion of reinforcement pillars. |
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Keywords: concrete pillar, electrical transmission line, degradation.
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RELIABILITY ANALYSIS OF POWER DISTRIBUTION SYSTEMS
Authors: Popescu V.Agrarian State University of Moldova
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Abstract: . Power distribution systems are basic parts of power systems and reliability of these systems at present is a key issue for power engineering development and requires special attention. Operation of distribution systems is accompanied by a number of factors that produce random data a large number of unplanned interruptions. Research has shown that the predominant factors that have a significant influence on the reliability of distribution systems are: weather conditions (39.7%), defects in equipment(25%) and unknown random factors (20.1%). In the article is studied the influence of random behavior and are presented estimations of reliability of predominantly rural electrical distribution systems. |
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Keywords: reliability of distribution systems; reliability of electrical equipments, electrical networks, reliability indicators; the influence of outward and inward factors.
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HEAT POWER ENGINEERING
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AUTONOMOUS HEAT SUPPLY SYSTEM OF CONSUMERS WITH CONSIDERABLE DIFFERENT THERMAL INERTIA
Authors: Berzan V.P., Sit M.L., Timchenko D.V. (Institute of Power Engineering of the ASM), Shvidchenko S.D., Nikonorova Iulia.V., Kotrutsa A.B. (Moldovan Technical University)
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Abstract: There are examined problems occurring at the adoption of the decentralized heat energy supply system of the group of objects, which contains buildings with thermal inertia differed in thousands of times one from the other. It is studied the influence of water volume of hot-water boiler on greenhouse dynamics. It is conducted the comparison between the use ob biomass and natural gas boilers for such as objects. |
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Keywords: autonomous heat supply system, heat supply, hot-water boiler dynamics.
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RAW MATERIAL DEWATERING ELECTROMAGNETIC TECHNOLOGIES
Authors: Burdo O.G., Tersiev S.G., Yarovoy I.I., Borshch A.A.Odessa National Academy of Food Technologies, Odessa, Ukraine
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Abstract: Moisture transfer schemes and mechanisms of capillary-porous materials dehydration are considered. Mechanical, thermal and diffusive mechanisms for different moisture linkage forms are analyzed, driving forces and velocity coefficients of processes are estimated. Availability of dehydration in microwave frequencies range field is shown. A new generalized complex that takes into account a specificity of micro- and nanokinetics of moisture transfer in products is proposed. The explanation of barodiffusive moisture transfer process mechanism in a product is shown. The results of experimental researches, in which specific energy of 1,9 MJ per 1 kg of removed moisture is reached, are shown. The tests results of the band dryer with microwave and infrared energy generators are presented. |
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Keywords: moisture transfer, diffusive mechanism, barodiffusion, nanokinetics
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COMPUTATIONAL MODELS USED FOR MINIMIZING THE NEGATIVE IMPACT OF ENERGY ON THE ENVIRONMENT
Authors: Oprea Diana, Dept. of Electrical Engineering, Czech Technical University, Prague, Czech Republic
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Abstract: Optimizing energy system is a problem that is extensively studied for many years by scientists. This problem can be studied from different views and using different computer programs. The work is characterized by one of the following calculation methods used in Europe for modelling, power system optimization. This method shall be based on reduce action of energy system on environment. Computer program used and characterized in this article is GEMIS. |
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Keywords: pollution, greenhouse gases, climate change, renewable energy.
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POWER SAVINGS AT SCHOOLS
Authors: Bodrug N.S.Amur state University, Blagoveshchensk, Russian Federation
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Abstract: It is considered the question of carrying out power inspections at school of Amur Region. The causes of over-expenditures of power resources are established. There are shown actions, which have been carried as a result of the investigation, directed on decrease of the level of the expense of power resources. |
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Keywords: power savings, over-expenditure of power resources, ventilation, thermostat, illumination.
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RENEWABLE ENERGY SOURCES
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ТHEORETICAL AND APPLIED ASPECTS OF IMPROVING THE BIOGAS TECHNOLOGY
Authors: Covaliov V.V., Ungureanu D.V., Covaliova O.V.
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Abstract: The general concept and efficiency improvement of anaerobic methane formation is discussed, new solutions on biomethane purification and increase of its yield in biogas composition are proposed, due to the technology optimization, biochemical conversion of gas mixture СО2/Н2 and introducing of stimulating micro-additives. |
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Keywords: biogas power engineering, methanogenesis biochemistry, biohydrogen, biostimulators of anaerobic fermentation.
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