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HEAT PUMP STATION WITH CARBON DIOXIDE AS A WORKING FLUID ENERGY EFFICIENCY GROWTH IN COMBINED DISTRICT HEATING SYSTEM DUE TO ITS CONTROL SYSTEM OPTIMIZATION
Authors: Sit B.M., Juravleov A.A., Sit M.L.
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Abstract: A diagram of the heat pump station (HPS) for the central heat supply station of the district heating system, which gets the power from the CHP plant is examined. A block diagram of the control of the system and compressor pressure control system are examined. The description of the control laws of evaporator at the variable heat load of the HPS and control laws of the gas cooler taking into account the goal of achieving the maximum of COP of HPS is shown as well. |
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Keywords: Heat pump station, carbon dioxide, control law
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| 2 |
WIND TURBINES FOR WIND POWER INSTALLATIONS
Authors: Barladean A.S.
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Abstract: The problem of wind turbine choice for wind power stations is examined in this paper. It is shown by comparison of parameters and characteristics of wind turbines, that for existing modes and speeds of wind in territory of Republic of Moldova it is necessary to use multi-blade small speed rotation wind turbines of fan class. |
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Keywords: wind turbine, wind power stations, wind power, aerodynamic characteristic, asynchronous generator
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DUAL THREE-PHASE ADJUSTABLE SPEED DRIVE WITH SYNCHRONIZED SPACE-VECTOR MODULATION
Authors: V. Oleschuk, R. Prudeak, A. Sizov, E. Yaroshenko
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Abstract: Split-phase symmetrical motor drive on the base of two voltage source inverters, controlled by algorithms of synchronized pulse width modulation (PWM), has been investigated. Simulation results are presented for dual three-phase power conversion systems with continuous, discontinuous and combined versions of synchronized PWM |
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Keywords: split-phase induction motor drive, dual voltage source inverters, pulse width modulation, phase voltage synchronization
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WAYS OF POWER EFFICIENCY INCREASE AT DRYING DISPERSABLE PRODUCTS
Authors: Burdo O.G., Kazmiruk Iu.A.
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Abstract: In the article questions of power, duration of process and quality production’s quality during drying are discussed. The new approach to modeling of drying and drying equipment is proved. Ways of perfection technologies of drying are analyzed. The mechanism and mathematical model of drying’s process of dispersive staffs by the combined way are presented. |
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Keywords: modeling of drying, mathematical model, process of drying
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EVALUATION OF OPPORTUNITIES OF SOLAR ENERGETICS ON THE BASIS OF ACCURATE GROUND-BASED MEASUREMENTS OF SOLAR RADIATION
Authors: A. Aculinin, V. Smicov
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Abstract: Expected quantity of a solar energy received by solar panel is estimated on the basis of accurate measurements of solar radiation in Kishinev. Optimal orientation of solar panels and apparent volume of the electric power generated by solar panels are determined. |
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Keywords: solar radiation, solar power.
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REFINED METHOD OF COMPUTING MODES OF OPERATING OF CAPACITY-TYPE SOLAR HEATERS OF WATER
Authors: Ermuratski Vasili, Ermuratski Vladimir, Ermuratski P.
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Abstract: The refined method procedure of thermal modes of solar heaters of water of the capacity type, based on use of an electro-thermal equivalent circuit and a method of central potentials is presented. |
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Keywords: solar heaters of water, electro-thermal equivalent circuit, solar radiation
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| 7 |
EFFICIENCY OF THE USE OF FLAT REFLECTORS IN SOLAR DEVICES
Authors: Ermuratski Vasili, Ermuratski Vladimir, Ermuratski P.
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Abstract: Using the methods of geometric optics the expressions used for the calculations of flat reflectors appliance for solar radiation intensity directed to the transparent barrier of solar devices increase were obtained |
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Keywords: Solar radiation, flat reflectors, solar devices
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| 8 |
ACTIVE POWER LOSSES IN LONG LINES DURING COORDINATED, LIMITING AND MALFUNCTION BEHAVIOR
Authors: Rimski V.K., Berzan V.P., Patsiuk V.I., Karcheva N.F., Andros I.V
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Abstract: Exact formulas for calculation of limiting values of transmitted capacity and efficiency of lines of a variable voltage with active loading on the reception end are resulted. Critical resistance and losses of capacity are determined depending on length Air-lines of an electricity transmission of a class of a voltage 500 … 750 kV. Emergency operation in the loaded electricity transmission is investigated. |
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Keywords: cable equations, active capacity, efficiency, factor capacities, critical resistance.
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| 9 |
THE ANALYSIS OF FUEL CONSUMPTION STRUCTURE AND CARBON DIOXIDE EMISSIONS BY VIEW OF ENERGY SECURITY IN ENERGETICS OF THE REPUBLIC OF MOLDOVA
Authors: Bicova E.V.
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Abstract: In the paper the analysis of fuel consumption block indicators dynamics of energy security indicators system is presented. Calculations results of carbon dioxide emissions in energy security indicators system ecological block are presented as well. |
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Keywords: Energy security, indicator, fuel consumption, carbon dioxide emissions
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