Articoli di riviste: "Energy accumulation system"

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Narita, Katsuhiko. "Energy Accumulation System by Heat Pumps". Journal of the Society of Mechanical Engineers 95, n. 878 (1992): 56–61. http://dx.doi.org/10.1299/jsmemag.95.878_56.

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Belik, Milan. "Optimisation of Energy Accumulation for Renewable Energy Sources". Renewable Energy and Power Quality Journal 19 (settembre 2021): 205–10. http://dx.doi.org/10.24084/repqj19.258.

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This project focuses on optimisation of energy accumulation for various types of distributed renewable energy sources. The main goal is to prepare charging – discharging strategy depending on actual power consumption and prediction of consumption and production of utilised renewable energy sources for future period. The simulation is based on real long term data measured on photovoltaic system, wind power station and meteo station between 2004 – 2021. The data from meteo station serve as the input for the simulation and prediction of the future production while the data from PV system and wind turbine are used either as actual production or as a verification of the predicted values. Various parameters are used for trimming of the optimisation process. Influence of the charging strategy, discharging strategy, values and shape of the demand from the grid and prices is described on typical examples of the simulations. The main goal is to prepare and verify the system in real conditions with real load chart and real consumption defined by the model building with integrated renewable energy sources. The system can be later used in general installations on commercial or residential buildings.

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Durcansky, Peter, David Hecko e Milan Malcho. "PRIMARY ENERGY ACCUMULATION THROUGH ADVANCED GAS HYDRATES SYSTEM". International Journal of Research -GRANTHAALAYAH 7, n. 5 (31 maggio 2019): 278–83. http://dx.doi.org/10.29121/granthaalayah.v7.i5.2019.846.

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Accumulation of primary energy of natural gas is a perspective industrial area mainly for countries dependent on the import of energy and raw materials. Transporting and storage of natural gas is economically and technologically demanding, which is always reflected in the resulting price. Natural gas hydrates allow transport and storage at low pressures and relatively favorable temperatures. Another no less important area is the storage of energy in biogas plants where gas formation is time-dependent. Biogas hydrates would allow short-term storage at room temperature and atmospheric pressure. This article deals with the design of a functional prototype for the production of hydrates and numerical simulation.

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Dostál, Zdeněk, e Michaela Solanská. "Calculation of accumulation unit for renewable energy source system". Journal of Energy Storage 14 (dicembre 2017): 410–15. http://dx.doi.org/10.1016/j.est.2017.05.016.

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Chоvniuk, Yuriy, Petro Cherednichenko, Anna Moskvitina e Maria Shyshyna. "CALCULATION OF CONSTRUCTION ELEMENTS OF HEAT ACCUMULATORS WITH LIQUID AND SOLID HEAT-ACCUMULATING MATERIAL". Urban development and spatial planning, n. 77 (24 maggio 2021): 475–86. http://dx.doi.org/10.32347/2076-815x.2021.77.475-486.

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The depletion of traditional fuel resources and the deterioration of the ecology of the environment, an increase in emissions into the air make the research on renewable energy and the need to attract clean energy sources to the energy balance of Ukraine. A promising direction is the use of solar energy for municipal heat supply, which can provide large heat needs even in temperate climates. Basically, the methods of using thermal energy from the sun are generally economically effective, but the share of using thermal solar energy is quite small. It can also be solved by accumulating these surpluses and using them during the heating season. The experience of operating unorganized seasonal heat accumulators in the soil indicates the low efficiency of such heat storage due to significant heat losses into the surrounding soil mass. For such systems (solar collectors + seasonal heat accumulator), it is advisable to use organized seasonal heat accumulators, which are designed for a certain amount of heat. An organized seasonal heat accumulator is understood as a heat storage system, which consists of a heat insulated tank for storing heat storage material and a heat carrier, which is used to transport heat to the heat storage material during its accumulation during the warm period and heat supply in the cold season from the heat storage material to energy consuming systems (heating system, hot water supply, etc.). The design of a heat accumulator with solid and liquid heat accumulating material is considered, in which a more uniform distribution of temperatures in the volume of the heat accumulator is achieved. A method for calculating structural elements for a heat accumulator with liquid and solid heat accumulating material has been developed, taking into account the heat loss of the heat accumulator and the characteristics of the soils at the construction site.

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Demchenko, Vladimir, Alina Konyk e Vladimir Falko. "Mobile Thermal Energy Storage". NTU "KhPI" Bulletin: Power and heat engineering processes and equipment, n. 3 (30 dicembre 2021): 44–50. http://dx.doi.org/10.20998/2078-774x.2021.03.06.

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The article is devoted to topical issues related to the storage, accumulation and transportation of heat by stationary and mobile heat storage. Analysis of the current state of the district heating system indicates significant heat losses at all stages of providing the consumer with heat. The use of heat storage in heat supply systems leads to balancing the heat supply system, namely, the peak load is reduced; heat production schedules are optimized by accumulating excess energy and using it during emergency outages; heat losses caused by uneven operation of thermal equipment during heat generation are reduced; the need for primary energy and fuel consumption is reduced, as well as the amount of harmful emissions into the environment. The main focus is on mobile thermal batteries (M-TES). The use of M-TES makes it possible to build a completely new discrete heat supply system without the traditional pipeline transport of the heat carrier. The defining parameters affecting the efficiency of the M-TES are the reliability and convenience of the design, the efficiency and volume of the “working fluid”, the operating temperature of the MTA recharging and the distance of transportation from the heat source to the consumer. The article contains examples of the implementation of mobile heat accumulators in the world and in Ukraine, their technical and technological characteristics, scope and degree of efficiency. The technical indicators of the implemented project for the creation of a mobile heat accumulator located in a 20-foot container and intended for transportation by any available means of transport are given.

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Sopov, Anatoliy I., e Aleksandr Vinogradov. "Ground Heat Accumulator for Backup Heat Supply of Energy Facilities". Elektrotekhnologii i elektrooborudovanie v APK 1, n. 42 (gennaio 2021): 50–54. http://dx.doi.org/10.22314/2658-4859-2021-68-1-50-54.

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Many power grid facilities require heating in winter. For their heating, they usually install a system of electric heaters, connect mini gas boilers or use the thermal emissions of working electrical installations, since these objects are often located away from the sources of central heating. This leads to additional costs for the organization's own needs. It is proposed to accumulate the excess heat generated by using a ground heat accumulator, which will allow you to accumulate heat in warm periods of the year and when there is an excess of thermal energy in the system, and then use the thermal energy of the accumulator to heat the object. (Research purpose) The research purpose is in developing a ground heat accumulator capable of accumulating excess heat energy generated during the operation of high-power transformers and, if necessary, to transfer the accumulated heat to the heat supply system of energy facilities. (Materials and methods) The article considers the advantages of introducing heat storage in the heat supply systems of various facilities. Authors conducted a literary analysis of various methods of heat accumulation. (Results and discussion) The article presents the justification for the choice of a ground heat accumulator. Authors have completed the description of the proposed battery and the technology of its creation. The article describes the method of calculation of the main elements of the selected type of heat accumulator and the quantitative characteristics of the accumulator on the example of real objects. The article describes the operation of the battery in interaction with a heat pump and a horizontal ground heat exchanger. (Conclusions) The use of a heat accumulator as a backup source for energy facilities allows organizations to reduce the cost of heating premises and equipment. Additional functions that the ground heat accumulator is capable of performing are identified.

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Shairi, Nur Amira Shahieda, Ruzlaini Ghoni e Kharudin Ali. "SOLAR PANEL DUST MONITORING SYSTEM". Engineering Heritage Journal 4, n. 2 (30 ottobre 2020): 44–45. http://dx.doi.org/10.26480/gwk.02.2020.44.45.

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Solar energy has been one of the most explored sources of renewable due to its economical source of energy. However, the main barrier for solar energy generation is the present of dust particles on the panel surface that decreases its performance. Hence, persistent monitoring on dust accumulation is of importance to guarantee the optimum power is achieved. Thus, this research aims to develop the real-time dust monitoring system of the solar panel. A dust sensor with IoT will be developed for this purpose. The reading of dust accumulation will be recorded and is accessible online through smartphones or desktop.

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Mukhammadiev, M. M., B. U. Urishev, A. Abduaziz uulu, S. K. Gadaev e S. U. Zhankabylov. "Issues of using local energy systems with hydraulic energy storage in the power system of the republic of Uzbekistan". E3S Web of Conferences 216 (2020): 01138. http://dx.doi.org/10.1051/e3sconf/202021601138.

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The method of determining the main energy parameters of a local energy system based on renewable sources with hydraulic accumulation of part of the generated energy is considered. The example shows the economic efficiency of hydraulic energy storage in comparison with lithium-ion batteries.

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Valtera, Jan, e Jaroslav Beran. "Magnetic-mechanical accumulator of kinetic energy". Autex Research Journal 14, n. 1 (14 marzo 2014): 1–6. http://dx.doi.org/10.2478/v10304-012-0038-0.

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Abstract The paper focuses on the process of non-contacting kinetic energy accumulation at the dead-end positions of a reciprocating rectilinear motion with a variable stroke. It describes the development of a magnetic-mechanical accumulator that absorbs energy while the moving part is decelerating towards the dead-end position and releases the energy back to the system while it is accelerating from the dead-end position. At the same time, it enables stroke modification of a certain level with a minimal impact on the maximum force of the accumulator. With respect to the magneto-static analysis of components, the preload of the mechanical element has been set accordingly. The dynamic analysis of the system has been carried out and the prototype produced and tested on the testing rig.

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Kellendonk, Christoph, Sandra Eiden, Oliver Kretz, Günther Schütz, Ingrid Schmidt, François Tronche e Eckhart Simon. "Inactivation of the GR in the Nervous System Affects Energy Accumulation". Endocrinology 143, n. 6 (1 giugno 2002): 2333–40. http://dx.doi.org/10.1210/endo.143.6.8853.

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Jin, Zhijun, Jinchuan Zhang e Xuan Tang. "Unconventional natural gas accumulation system". Natural Gas Industry B 9, n. 1 (febbraio 2022): 9–19. http://dx.doi.org/10.1016/j.ngib.2021.08.013.

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Bratyuk, P. "MODELING OF ENERGY STORAGE PROCESSES IN ELECTROMECHANICAL SYSTEMS ON THE BASIS OF THE PROVISIONS OF THE VIRAL THEOREM". Electromechanical and energy saving systems 3, n. 51 (29 settembre 2020): 8–18. http://dx.doi.org/10.30929/2072-2052.2020.3.51.8-18.

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Purpose. According to the results of research initiated by revealing the paradox of energies of disturbed lever equilibrium, and on the basis of the virial theorem, a formalized physical mechanism of accumulation of viral energy of forces acting in the system of material points is established. The equilibrium state is introduced into the mathematical apparatus of the viral theorem as an initial condition for averaging energy over time, which complements the statistical method with an agreed formalized physical mechanism of energy accumulation due to the imbalance of the system. Instead, the method of statistical averaging of energy over time remains unchanged, and from a tool for quantitative assessment of stored energy is transformed into a universal tool for modeling energy storage processes. The results are verified by comparing the correspondence of the viral theorem of the formalized physical mechanism of energy accumulation and the formalized physical mechanism of energy conversion. Methodology. Within the mathematical apparatus of the viral theorem, formalized physical mechanisms of energy accumulation and conversion create opportunities to combine a wide range of existing methods of mathematical modeling and energy averaging over time, for example, with probabilistic analysis of stochastic discrete-continuous systems and processes to develop new methods and means of modeling energy and analysis of the behavior of physical systems of different nature. Results. Theoretical results of modeling and analysis of energy storage processes of electrostatic and magnetic fields allow to eliminate contradictions in the understanding of the physical content of the factor ½ in the energy formulas of the capacitor and inductor and explain it in accordance with the viral theorem. Originality. For the first time, the state of equilibrium of a system is considered as an initial condition for averaging energy over time, which complements the statistical method of the mathematical apparatus of the viral theorem with an agreed formalized physical mechanism of energy accumulation due to system imbalance. Instead, the method of statistical averaging of energy over time remains unchanged and from a tool for quantitative assessment of stored energy is becoming a universal tool for modeling the course of energy storage processes. On the basis of the formalized physical mechanism of energy accumulation the methodical bases of development of mathematical models of dynamics of processes of energy accumulation which provide a combination with a wide range of the developed methods of mathematical modeling, in particular, means of modeling energy storage and analysis of the behavior of physical systems of different nature. Practical value. Of practical importance is a method developed on the basis of simulation results of converting current energy into pulse energy, which combines the properties of disturbed energy balance and duality of capacitor and inductor, and consists in controlling the simultaneous accumulation and conversion of energy pulse repetition. Figures 6, references 14.

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Liu, Wei Fu, Shuang Long Liu e Li Xin Sun. "Distribution and Accumulation of Energy Resources in Ordos Basin". Advanced Materials Research 912-914 (aprile 2014): 1621–24. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.1621.

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Ordos basin is prolific in petroleum, natural gas, and coal resources, and is an important energy base in our country. The petroleum distributes in Jurassic to be subjected by the eroding river valley and Triassic to be subjected by depositional system of delta. The natural gas distributes in Upper Paleozoic to be controlled by the delta depositional system and Lower Paleozoic to be controlled by the fossil weathered crusts. The coal distribute in Permo-Carboniferous, Triassic and Jurassic, which has been controlled by the turning stage of tectonism and palaeokarsts. The distribution of oil, gas and coals present the regulation in the basin, but the styles that the dissimilarity structure unit to places have the bigger difference. In order to reduce the exploration cost, the petroleum, natural gas and coals should carry on comprehensive exploration.

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Avilov, A. S., A. K. Kuligin, U. Pietsch, J. C. H. Spence, V. G. Tsirelson e J. M. Zuo. "Scanning system for high-energy electron diffractometry". Journal of Applied Crystallography 32, n. 6 (1 dicembre 1999): 1033–38. http://dx.doi.org/10.1107/s0021889899006755.

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A new electron diffractometer with a diffraction-pattern scanning system in front of a fixed counter has been developed. Significant improvement was achieved in the measured diffraction intensities by using fast electronics and additional control of the stability of the electron beam. The measurement of and accounting for the gear-frequency characteristic of the registration system was performed, and the signal accumulation mode for intensity measurements together with advanced statistical data processing were employed. Good agreement between the experimental and Hartree–Fock structure factors for LiF, NaF and MgO was achieved (to avoid strong extinction effects, rather thin polycrystalline films were used as samples).

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Bie, Pei, Zhong Kang Wei, Bu Han Zhang, Jing Xing, Shuang Zhao, Mei Li e Yuan Fang Zeng. "Dynamic Economic Dispatch of Wind Power Incorporated System". Advanced Materials Research 953-954 (giugno 2014): 570–74. http://dx.doi.org/10.4028/www.scientific.net/amr.953-954.570.

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Wind energy source has been paid high attention to and developed into one of the most mature and largest-scale mode of new energy power generation. However, the uncertainty and fluctuation of wind power brings great challenge to the normal operation of power system. In this paper, the dynamic economic dispatch of wind power incorporated system is demonstrated. The accumulation variable method based on chance constraint programming is adopted to make the dynamic economic dispatch. The test example shows that the accumulation variable method based on chance constraint programming is suitable and effective.

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Loskutov, A. B., E. N. Sosnina, A. I. Chivenkov, E. V. Kryukov e A. P. Shashkin. "Research of experimental hybrid energy complex with fuel cells operating on biogas". E3S Web of Conferences 124 (2019): 01044. http://dx.doi.org/10.1051/e3sconf/201912401044.

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The article deals with the development of a hybrid energy complex (HEC) based on solid oxide fuel cells (SOFC) operating on biogas. Low maneuverability of SOFC prevents a widespread use of such power installations in consumers’ power supply systems. The authors have developed the design of the HEC and an active-adaptive control system that allows solving the problem of SOFC low maneuverability. An experimental HEC consisting of a SOFC generation system, an accumulation system, a coupling system and a control system have been created. The research of the experimental HEC characteristics and the possibility of developing emergency situations during its operation has been carried out. The results of the charge and discharge characteristics of the accumulation system research, as well as the current and voltage dependences of the HEC coupling system are presented. The conducted studies have proved the effectiveness of the developed scientific and technical innovations.

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Blumberga, D., E. Vigants, F. Romagnoli, A. Blumberga, S. N. Kalnins e I. Veidenbergs. "Hybrid System with Biomethanation for Wind Energy Accumulation in the Baltic Countries". Energy Procedia 75 (agosto 2015): 754–59. http://dx.doi.org/10.1016/j.egypro.2015.07.507.

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Arboleya, Pablo, Islam El-Sayed, Bassam Mohamed e Clement Mayet. "Modeling, Simulationand Analysis of On-Board Hybrid Energy Storage Systems for Railway Applications". Energies 12, n. 11 (10 giugno 2019): 2199. http://dx.doi.org/10.3390/en12112199.

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In this paper, a decoupled model of a train including an on-board hybrid accumulation system is presented to be used in DC traction networks. The train and the accumulation system behavior are modeled separately, and the results are then combined in order to study the effect of the whole system on the traction electrical network. The model is designed specifically to be used with power flow solvers for planning purposes. The validation has been carried out comparing the results with other methods previously developed and also with experimental measurements. A detailed description of the power flow solver is beyond the scope of this work, but it must be remarked that the model must by used with a solver able to cope with the non-linear and non-smooth characteristics of the model. In this specific case, a modified current injection-based power flow solver has been used. The solver is able to incorporate also non-reversible substations, which are the most common devices used currently for feeding DC systems. The effect of the on-board accumulation systems on the network efficiency will be analyzed using different real scenarios.

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Nezevak, V. L. "Comparison of energy parameters of electric storage systems for DC and AC traction power supply systems". Russian Railway Science 81, n. 1 (29 marzo 2022): 38–52. http://dx.doi.org/10.21780/2223-9731-2022-81-1-38-52.

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Introduction. The article discusses the energy parameters of electric power storage systems for DC and AC traction power supply systems. The purpose of the research is to evaluate the energy parameters of electric power storage systems located within the inter-substation zone boundaries of the AC traction power supply system at the 25 kV voltage.Materials and methods. The author used the methods of modeling, statistics and the experimental results processing. Moreover, the paper presented the parameter estimation of the energy accumulation system on the basis of the traction calculations for the AC rolling stock. In addition, the author made two variants of calculations — in the presence and the absence of the electric storage system. The researcher also made the simulation of the electric storage system for the voltage source connected to the sectioning post busbars.Results. Using the simulation modeling, the author presents active and reactive power graphs of the inter-substation zone boundaries in the active sectioning post operation conditions. Therefore, the article demonstrates the graph of the expected charge, the discharge depth calculations for the nominal energy capacity and the required charging features, which guarantee the charge restoration of the accumulation system to the initial level.Discussion and conclusion. The author offers the comparative assessment of the electric storage systems for the traction power supply with the DС voltage of 3 kV and the AC voltage of 25 kV. The research demonstrates the reducing potential of the nominal accumulation parameters.

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Momose, T., K. Narushima, K. Kanazawa, H. Mizuno, H. Watanabe e H. Ishimaru. "Operational Characteristics of the Tristan Accumulation Ring Vacuum System". IEEE Transactions on Nuclear Science 32, n. 5 (ottobre 1985): 3809–11. http://dx.doi.org/10.1109/tns.1985.4334511.

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Lutz, Yves, Alexis Matwyschuk e Jean-Michel Poyet. "Experimental SWIR gated viewing in accumulation mode". Advanced Optical Technologies 8, n. 6 (18 dicembre 2019): 437–43. http://dx.doi.org/10.1515/aot-2019-0038.

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Abstract The recent availability of imaging sensors able to work in accumulation mode in the SWIR spectral range allows the realization of new efficient range-gated viewing systems. Such systems relax the illumination constraint so that the energy required to build an image can be distributed over several laser pulses. Semiconductor or fiber lasers can be used instead of high peak power solid state lasers. Such a system was realized in our laboratory, tested, and compared to a more classical flash system under outdoor conditions. In a first step, images of the same scenes recorded in the same weather conditions were compared to those recorded with a classical system working in flash mode. The MTF analysis shows an improvement of up to 40% with the system working in accumulation mode. In order to remove the influence of two different laser sources as well as of two different cameras, a second experiment was conducted. For this purpose, a shorter range and only one system were employed. Both operating modes, the flash and the accumulation mode, were examined. The second experiment confirms that accumulation mode can decrease significantly the value of the scintillation index resulting in a higher resistance to optical perturbations. These results increase the relevance of the accumulation mode for active imaging applications in the SWIR spectral region.

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Vecherkovskiy, A. F., P. E. Egorov, A. B. Miloradov e A. B. Filatov. "Onboard scanning system for photodetector with time delay and charge accumulation". Journal of «Almaz – Antey» Air and Space Defence Corporation, n. 4 (30 dicembre 2016): 49–57. http://dx.doi.org/10.38013/2542-0542-2016-4-49-57.

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The study describes scanning space-based assets which, by means of a flat scanning mirror and an optical system, provides the transformation of the object space into a temporal sequence of electronic signals of a photodetector with a time delay and charge accumulation. High accuracy of photodetector elements polling and scanning of the object space is due to the movement of the scanning mirror according to the indications of a non-contact interferometric angle sensor. The reciprocating rotary scanning by a flat mirror is kinetically compensated by the opposite motion of the flywheel, which minimizes residual perturbations on the space platform. To reduce the impulse energy consumption and the time of reversal between the scanning mirror and the compensating flywheel, magnetic reversal energy recuperators are used.

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Dzikevics, Mikelis, Ance Ansone e Ivars Veidenbergs. "Experimental investigation of flow rate impact on thermal accumulation system with PCM". Energy Procedia 128 (settembre 2017): 386–92. http://dx.doi.org/10.1016/j.egypro.2017.09.043.

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FUKUI, Ren, Kokyo BA, Ryojun IKEURA, Soichiro HAYAKAWA, Shigeyoshi TSUTSUMI e Hideki Sawai. "Control for a Series Elasticity Actuator System with a Brake by Energy Accumulation". Proceedings of Conference of Tokai Branch 2019.68 (2019): 508. http://dx.doi.org/10.1299/jsmetokai.2019.68.508.

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Borman, V. D., A. A. Belogorlov, A. M. Grekhov, G. V. Lisichkin, V. N. Tronin e V. I. Troyan. "The mechanism of mechanical energy accumulation in a nonwetting liquid-nanoporous solid system". Technical Physics Letters 30, n. 12 (dicembre 2004): 973–75. http://dx.doi.org/10.1134/1.1846831.

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El-Borhamy, Mohamed, Tamer Medhat e Manal E. Ali. "Chaos Prediction in Fractional Delayed Energy-Based Models of Capital Accumulation". Complexity 2021 (8 marzo 2021): 1–14. http://dx.doi.org/10.1155/2021/8751963.

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This paper presents the nonlinear dynamic analysis of energy-based models arisen from the applied systems characterized by the energy transport in the presence of fractional order derivative and time delay. The studied model is the fractional version of Bianca-Ferrara-Dalgaard-Strulik (BFDS) model of economy which is viewed as a transport network for energy in which the law of motion of capital occurs. By considering the time delay as bifurcation parameter, a proof to investigate the existence of Hopf bifurcation and the phase lock solutions using the Poincare-Linstedt and the harmonic balance methods is given. At definite values of time delay, period-doubling bifurcations followed up by the consequences of chaotic states are detected. Simulation results assure that the BFDS model can generate new (hyper) chaotic attractors beyond half order derivatives through the effect of the time delay on that system. In accordance with the literatures related to the problem of chaos, the concluded results confirm the proposed theorem by El-Borhamy in which the time delay possesses the ability to change the dynamic state of nonlinear systems from regular to chaotic within the fractional order derivative domain.

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Smigielski, AJ, ME Muir e BJ Wallace. "Studies on the Accumulation of Putrescine and Spermidine in Escherichia coli". Australian Journal of Biological Sciences 38, n. 4 (1985): 383. http://dx.doi.org/10.1071/bi9850383.

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The rate of accumulation of the polyamines spermidine and putrescine by E. coli depended on growth rate. Spermidine ac~umulation was faster in chemostat cultures with high dilution rates than in those with low dilution rates and was slower in bacteria that had been grown for several generations with either putrescine or spermidine, suggesting that the spermidine-uptake system was repressed by exogenous polyamines. The uptake of spermidine required metabolic energy. Thus accumulation occurred in an energy-starved unc strain only upon addition of glucose (or D-lactate to a smaller extent). With glucose present accumulation occurred in an unc, frd strain under anaerobic conditions, suggesting that ATP drives uptake. However, accumulation was generally sensitive to carbonylcyanide m-chlorophenylhydrazone (CCCP), indicating that the proton motive force was involved in uptake. Unlike spermidine, putrescine accumulation was faster in slow-growing than in fast-growing cultures. This may have been due to greater efflux of putrescine at faster growth rates. Accumulation of putrescine was faster following prolonged growth with either putrescine or spermidine, suggesting induction of the putrescine-uptake system by exogenous polyamines. Like spermidine accumulation, putrescine accumulation required metabolic energy. Accumulation was insensitive to CCCP and occurred only when glucose was added to energy-starved unc bacteria, suggesting that high-energy bonds may drive the uptake of putrescine.

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Polikarpova, Ilze, Dace Lauka, Dagnija Blumberga e Edgars Vigants. "Multi-Criteria Analysis to Select Renewable Energy Solution for District Heating System". Environmental and Climate Technologies 23, n. 3 (1 dicembre 2019): 101–9. http://dx.doi.org/10.2478/rtuect-2019-0082.

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Abstract The research paper is focused on how to choose the most suitable renewable energy solution using multi-criteria analysis for a district heating system. Making choices is based on indicators – economic, environmental and social. In this case, the study used five indicators: resources costs, totals investments, reduction of greenhouse gas emissions, specific weight of renewable energy resources and impact on utilized land. Three situations have been compared – current situation: gas boiler, planned: solar collectors 21 595 m2 + accumulation tank 8000 m3 and alternatives: solar PV panels 5504 m2 – heat pump COP 3 are used in the estimation. The multi-criteria decision-making analysis shows that solar collectors 21 595 m2 + accumulation tank 8000 m3 are considered as the best alternative. The methodology is based on choosing a solution for a district heating company in Latvia.

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Kolkovska, H. M., B. I. Rachiy, P. I. Kolkovskyi, I. P. Yaremiy, N. Ya Ivanichok e R. P. Lisovskiy. "Mechanisms of charge accumulation of the electrochemical system LaMnO3 / AC". Physics and Chemistry of Solid State 22, n. 4 (11 novembre 2021): 644–54. http://dx.doi.org/10.15330/pcss.22.4.644-654.

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In this work, the electrochemical behavior of LaMnO3 perovskite material and nanoporous carbon material in an aqueous solution of lithium sulfate are studied. The regularities of the expediency of the joint functioning of these materials as electrodes for a hybrid electrochemical capacitor are determined. It was found that the value of the specific capacity of the investigated electrochemical system of LaMnO3 / electrolyte / AC is 52 F/g during the discharge of the system to 1 V and the value of specific energy is 112.1 J /g at a discharge current of 1 mA.

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Kucybała, Piotr. "Hydro-Pneumatic Accumulator Study with the Use of Thermodynamic Model Simulation". Key Engineering Materials 542 (febbraio 2013): 97–104. http://dx.doi.org/10.4028/www.scientific.net/kem.542.97.

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The presented paper deals the simulation model of hydro-pneumatic accumulator. Mathematical model of the system uses the motion and flow continuity equations as well as formulas determining hydro-pneumatic piston accumulator behavior. In accumulator model heat transfer phenomena are included and Van der Waals real gas low, to calculate gas parameters during its operation. Modeling and simulation tests are performed for different work cycles to determine the key parameters of hydrostatic system associated with energy saving, such as: piston velocity, working pressure and heat flux. The aim of the research program is to determine the efficiency of energy accumulation in the assumed work cycles and to find which parameters are significant and how they can be changed to increase accumulator efficiency.

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32

Gorás, M., Z. Vranayová e F. Vranay. "The trend of using solar energy of a green intelligent building and thermal energy storage to reduce the energy intensity of the building". IOP Conference Series: Materials Science and Engineering 1209, n. 1 (1 dicembre 2021): 012069. http://dx.doi.org/10.1088/1757-899x/1209/1/012069.

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Abstract The trend is to reduce the energy intensity of buildings. Thermal energy storage (TES) is the biggest challenge for buildings. It is a technology that supplies thermal energy by heating or cooling a tank, which then serves for the system in the building. Comparison of hitherto known systems ATES, BTES, PTES and research TTES. The most important factors for the accumulation of thermal energy are capacity (the energy stored in the system - depends on the storage process, the medium, and the size of the system), power (how fast the energy stored in the system can be discharged and charged), efficiency (the ratio of the energy provided to the user to the energy needed to charge the storage system. It accounts for the energy loss during the storage period and the charging/discharging cycle), storage (how long the energy is stored and lasts hours to months), charging and discharging (how much time is needed to charge or discharge the system), and cost (refers to capacity (€/kWh) or power (€/kW) of the TES system and depends on the capital and operation costs of the storage equipment and its lifetime).

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Chao, Kuei-Hsiang, Yu-Ju Lai e Wen-Ching Chang. "Development of a Stand-Alone Photovoltaic System Considering Shaded Effect for Energy Storage and Release". Electronics 8, n. 5 (22 maggio 2019): 567. http://dx.doi.org/10.3390/electronics8050567.

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The purpose of this study was to develop a photovoltaic system that stores energy for use in direct current micro-grid systems or to supply electric power to consumers living in remote areas. If the photovoltaic module array is shaded, the signals of conventional maximum power point trackers (MPPT) may be trapped at the local power maxima. Therefore, this study developed a smart maximum power point tracker to track the maximum power point (MPP). The control method adopted a teaching learning based optimization (TLBO) algorithm. To adjust the energy flow direction of the direct current load terminal, this study proposed an energy accumulation and release strategy that used a high-boost/buck-ratio bidirectional converter to control the battery charge and discharge for energy accumulation and release. In addition, this study developed an inverter to convert direct current into alternating current for alternating current loads.

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Posmetev, Valeriy, Vadim Nikonov, Viktor Posmetev e Vladimir Zelikov. "COMPUTER SIMULATION RESULTS OF FUNCTIONING OF THE PNEUMATIC SUBSYSTEM OF RECOVERABLE HYDRAULIC DRIVE OF A FOREST TRUCK WITH A SEMI-TRAILER". Forestry Engineering Journal 10, n. 1 (6 aprile 2020): 233–43. http://dx.doi.org/10.34220/issn.2222-7962/2020.1/17.

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The relevance of developing new devices for accumulation and conversion of compressed air energy in a regenerative hydraulic drive of a timber truck with a semitrailer has been substantiated. The layout of recuperative mechanisms on a timber tractor with a semitrailer and the diagram of a recuperative hydraulic drive with subsystems for accumulating and converting compressed air energy are presented. A simplified diagram of a pneumatic energy-saving system for studying the functioning of the subsystems of accumulation and energy conversion of compressed air is presented. A mathematical model has been developed to evaluate the efficiency of using a pneumatic energy-saving system, which includes the equations of change in the gas state in its elements, solved by the Euler numerical method. A modeling algorithm is described, consisting of seven repeating steps performed in the process of computer simulation. The developed computer program is presented, which allows studying pneumatic energy-saving system. Computer experiments with the most typical set of its design and technological parameters are presented. The time dependences of the volume of the pneumatic cavities under consideration, the amount of substance in them, pressure and air temperature in the pneumatic cavities under consideration are obtained. The influence of the diameter of the pneumatic cylinder on the filling time of the receiver, the number of strokes of the piston and thermal efficiency has been defined

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Smusz, Robert, Paweł Kielan e Damian Mazur. "Analysis of thermal stratified storage tank". Archives of Electrical Engineering 66, n. 3 (1 settembre 2017): 631–42. http://dx.doi.org/10.1515/aee-2017-0048.

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Abstract The basic aim of the task is to compile a temperature stratification system in an accumulation tank. The range of the thesis concerns the shape and dimensions of a stratification system for an accumulation tank. Thermal stratification is a process that comprises the maintaining of temperature stratification at different levels of an accumulation tank which reduce to a minimum the process of temperature equalization. It results from the fact that the thermal stratification in a tank significantly increases the installation efficiency and improves the process of energy storing. It is connected with a thermodynamic element quality, that is the higher the temperature, the higher the energy, and, thus, the thermos-dynamic element quality. In this phenomenon, thanks to the same amount of accumulated thermal energy and average temperature, as in a fully mixed tank, the user has a higher temperature in the upper part of the tank at his disposal. It has significant importance in the case when there is a low-temperature heating medium that transfers heat to the accumulation tank. Such a situation occurs when heat is absorbed from synthetic freons used in cooling and air-conditioning systems.

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Sobchuk, Valentyn, Oleg Barabash, Andriy Musienko e Olha Svynchuk. "Adaptive accumulation and diagnostic information systems of enterprises in energy and industry sectors". E3S Web of Conferences 250 (2021): 08002. http://dx.doi.org/10.1051/e3sconf/202125008002.

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Our paper describes the methodology of an effective system construction based on information systems self-diagnosis using the case of Ukrainian enterprises in metallurgy, energy, and chemical industry. It describes the method of organization and implementation of self-diagnosis, mechanisms of detection, as well as the identification and localization of failed modules. The results formulate the criteria of sufficiency of efficiency of diagnostic information in the absence of restrictions on performance of elementary checks. Moreover, it yields the criterion of sufficiency of diagnostic information in the presence of restrictions on performance of elementary checks.

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Alawasa, Khaled M., Rashid S. AlAbri, Amer S. Al-Hinai, Mohammed H. Albadi e Abdullah H. Al-Badi. "Experimental Study on the Effect of Dust Deposition on a Car Park Photovoltaic System with Different Cleaning Cycles". Sustainability 13, n. 14 (8 luglio 2021): 7636. http://dx.doi.org/10.3390/su13147636.

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For a decade, investments in solar photovoltaic (PV) systems have been increasing exponentially in the Middle East. Broadly speaking, these investments have been facing tremendous challenges due to the harsh weather in this particular part of the world. Dust accumulation is one the challenges that negatively affects the performance of solar PV systems. The overall goal of this paper is to thoroughly investigate the effect of dust accumulation on the energy yield of car park PV systems. With this aim in mind, the paper presents scientific values for further research and opens the horizon for attracting further investments in solar PV systems. This study is based on a real PV system in the Sultanate of Oman and considers different cleaning cycles for 16 months (from 29 July 2018 to 10 November 2019). Furthermore, four different PV groups were assessed, and the system was monitored under different cleaning frequencies. In general, it was found that dust accumulation has a significant impact; under 29-day, 32-day, 72-day, and 98-day cleaning cycles, the average percentages of energy loss due to soiling were 9.5%, 18.2%, 31.13%, and 45.6%, respectively. In addition, the dust effect has a seasonal variation. The study revealed that dust accumulation has a more negative impact during summer than during winter. During summer, the energy losses due to soiling were 8.7% higher than those during winter. The difference was attributed to different environmental conditions, with high humidity and low wind speed being the main factors that worsen the impact of dust during summer. Based on the findings of this research, a monthly cleaning program is highly recommended in the city of Muscat.

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Mroz, A., A. Orlowska e J. Holnicki-Szulc. "Semi-Active Damping of Vibrations. Prestress Accumulation-Release Strategy Development". Shock and Vibration 17, n. 2 (2010): 123–36. http://dx.doi.org/10.1155/2010/126402.

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New method for semi-active control of vibrating structures is introduced. So-called Prestress Accumulation-Release (PAR) strategy aims at releasing of the strain energy accumulated in the structure during its deformation process. The strain energy is converted into kinetic energy of higher modes of vibration which is suppressed with structural damping or by means of a damping device. The adaptation process essentially affects the first mode vibrations by introducing an elastic force that opposes the movement. Numerical simulations as well as experimental results prove that the strategy can be very effective in mitigating of the fundamental mode of a free – vibrating structure. In a numerical example 95% of the vibration amplitude was mitigated after two cycles. An experimental demonstrator shows 85% reduction of the amplitude in a cantilever free- vibrations. In much more complex practical problems smaller portion of total energy can be released from the system in each cycle, nevertheless the strategy could be applied to mitigate the vibrations of, for example, pipeline systems or pedestrian walkways.

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Gevorgyan, A. A. "Optical Energy Accumulation by a System Comprising an Optical Diode, Insulating Layer, and Mirror". Technical Physics 50, n. 5 (2005): 625. http://dx.doi.org/10.1134/1.1927219.

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40

Yan, Xiaojin, e Yan Pan. "Performance analysis of heat accumulation of solar thermal generator units by computer numerical simulation". Thermal Science 24, n. 5 Part B (2020): 3279–87. http://dx.doi.org/10.2298/tsci191129119y.

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The core carrier working substances of heat accumulation of solar thermal generator units are analyzed through computer numerical simulation analysis and simulation experiments, including the selection criteria of working substances, the mechanism of heat accumulation system, the correlation between power generation efficiency and the evaporation temperature of working substance, the correlation between the condensing temperature and condensing pressure of working substance, and the influence of working substance velocity on heat accumulation capacity. The results show that under the same radiation intensity, the greater the flow velocity of the working substance is, the worse the heat accumulation and heat conduction of the working substance is. As the condensing temperature of the working substance increases, the condensing pressure also increases. As the evaporation temperature of the working substance increases, the power generation efficiency of the working substance also increases significantly. In summary, the heat accumulation system based on the high efficiency working substances is vital for the normal operation of solar thermal generator units. Once the solar radiation intensity cannot meet the needs of power generation, the heat accumulation system will output previously-stored thermal energy. Meanwhile, its collection and release of thermal energy depend on the photovoltaic intensity. The constructed hot-oil working substance-based heat accumulation system satisfies the normal operation needs for thermal generator units, which is significant for subsequent research.

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Sipkova, Veronika, Jiri Labudek e Otakar Galas. "Low Energy Source Synthetic Thermal Energy Storage (STES)". Advanced Materials Research 899 (febbraio 2014): 143–46. http://dx.doi.org/10.4028/www.scientific.net/amr.899.143.

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The team of Building environment in VŠB-Technical university of Ostrava works intensively on options in long-term accumulation of heat in underground storages. The new concept follows the Directive of the European Parliament and of the Council 2010/31/EU on the energy performance of buildings [1]. The Directive requires that energy should be extensively covered of renewable sources produced at or in the vicinity of building, where it will be consumed. The aim of the research is create thermal energy storage with model structure for complex of family house. For the storage will be used recycled materials especially recycled concrete. This system will be heat source in winter period and heat consumer in summer period.

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42

Gardner, Christopher L., Paran J. Sarma e Erik Kjeang. "Accumulation of Inert Impurities in a Polymer Electrolyte Fuel Cell System with Anode Recirculation and Periodic Purge: A Simple Analytical Model". Energies 15, n. 6 (8 marzo 2022): 1968. http://dx.doi.org/10.3390/en15061968.

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Anode recirculation with periodic purge is commonly used in polymer electrolyte fuel cell systems to control the accumulation of nitrogen, water, and other impurities that are present in the fuel or diffuse through the membrane from the cathode compartment. In this work, we develop a simple, generalized analytical model that simulates the time dependence of the accumulation of inert impurities in the anode compartment of such a system. It is shown that, when there is transport out of the anode chamber, the inert species is expected to accumulate exponentially until equilibrium is reached when the rate of inert entering the anode in the fuel supply and/or via crossover from the cathode is balanced by the rate of leakage and/or crossover to the cathode. The model is validated using recently published experimental data for the accumulation of N2, CH4, and CO2 in a recirculated system. The results show that nitrogen accumulation needs to be taken into account to properly adjust system parameters such as purge rate, purge volume, and recirculation rate. The use of this generalized analytical model is intended to aid the selection of these system parameters to optimize performance in the presence of inerts.

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BALABIN, ALEKSANDR A. "OPERATION ANALYSIS AND RECOMMENDATIONS FOR IMPROVING THE ELECTRIC ENERGY STORAGE SYSTEM INSTALLED IN THE RURAL 0.4 KV POWER GRID". Agricultural engineering, n. 1 (2022): 72–79. http://dx.doi.org/10.26897/2687-1149-2022-1-4-72-79.

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To optimize the modes of operation of the power system, improve the power supply reliability to consumers and improve the quality of power supplied to the grid, power storage systems are used as the main and backup power sources. The analysis of the practical experience of using the accumulation system is rather topical nowadays. The authors analyze the practical application in the 0.4 kV power grid “Orelenergo” of an electric energy storage system in the form of a 20 kWh storage device of the MRSK2.0/ESS-50.40 type, installed to improve the quality of electric energy. The article gives an overview of the operating modes of the system’s storage energy and provides the results of an analysis of its control algorithms. It is established that a power grid with unbalanced load application of the considered storage system has worsened operating parameters. This problem arises due to the following design shortcomings: no dependence of the charging/discharging intervals of the drive on the load schedule of consumers, no phase-by-phase control of power output and charging, no shutdown algorithms in an emergency in the power grid. The article concludes with the statement about the incorrect selection of the accumulator intended for correcting power quality indicators. The authors provide recommendations to improve the energy storage systems designed to enhance the quality of electricity to avoid the identified shortcomings.

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Nizetic, Sandro, Roko Gizdic, Ankit Yadav e Miro Bugarin. "Integrated Split Heat Pump System for Building Applications". Applied Mechanics and Materials 705 (dicembre 2014): 263–67. http://dx.doi.org/10.4028/www.scientific.net/amm.705.263.

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In this paper, a design of a specific hybrid energy system is elaborated for small scale applications in building facilities of residential or commercial purpose. The energy system is assembled from existing market available technologies that include implementation of a heat pump technology, photovoltaic system and of a standard accumulation boiler for the preparation of hot water. The developed energy system is assumed to be used in mild climates where a heat pump system can be efficiently used throughout the year. According to the gained experimental results the coefficient of the performance for the cooling mode can be expected between 5.0 and 6.0, which prove that the proposed system is highly energy efficient. The developed energy system can cover both cooling and heating demands and also demands for domestic hot water and it represents a totally renewable energy system.

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Böszörményi, L., e E. Šiváková. "Contribution to mathematical modelling of charging and discharging of the seasonal heat storage tank". International Review of Applied Sciences and Engineering 3, n. 1 (1 giugno 2012): 75–79. http://dx.doi.org/10.1556/irase.3.2012.1.9.

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Abstract The seasonal heat storage tank is the most important component of the SDH system, which allows significant increase in the share of solar energy in heat supply in comparison with conventional solar systems with short-term accumulation of heat. The adverse impact of their investment sophistication on competitiveness may be compensated by the increased use. For example: Administrative cooperation with heat pump allows increasing the accumulation capacity of the seasonal heat storage tank. Such cooperetion causes the direct use of heating energy and the accumulation of cooling energy produced by heat punp in the final stage of the heating period. It can be used to remote cooling supplied buildings. Experimentation on mathematical models is possible to obtain valuable insights about the dynamics of the processes of charging and discharging in the seasonal storage tank and subsequently used in the design, implementation and operation.

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Huang, K., S. K. Srivastava e D. A. Cartes. "Solving the Information Accumulation Problem in Mesh Structured Agent System". IEEE Transactions on Power Systems 22, n. 1 (febbraio 2007): 493–95. http://dx.doi.org/10.1109/tpwrs.2006.888949.

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47

Yuvan, Steven, e Martin Bier. "Accumulation of Particles and Formation of a Dissipative Structure in a Nonequilibrium Bath". Entropy 24, n. 2 (27 gennaio 2022): 189. http://dx.doi.org/10.3390/e24020189.

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The standard textbooks contain good explanations of how and why equilibrium thermodynamics emerges in a reservoir with particles that are subjected to Gaussian noise. However, in systems that convert or transport energy, the noise is often not Gaussian. Instead, displacements exhibit an α-stable distribution. Such noise is commonly called Lévy noise. With such noise, we see a thermodynamics that deviates from what traditional equilibrium theory stipulates. In addition, with particles that can propel themselves, so-called active particles, we find that the rules of equilibrium thermodynamics no longer apply. No general nonequilibrium thermodynamic theory is available and understanding is often ad hoc. We study a system with overdamped particles that are subjected to Lévy noise. We pick a system with a geometry that leads to concise formulae to describe the accumulation of particles in a cavity. The nonhomogeneous distribution of particles can be seen as a dissipative structure, i.e., a lower-entropy steady state that allows for throughput of energy and concurrent production of entropy. After the mechanism that maintains nonequilibrium is switched off, the relaxation back to homogeneity represents an increase in entropy and a decrease of free energy. For our setup we can analytically connect the nonequilibrium noise and active particle behavior to entropy decrease and energy buildup with simple and intuitive formulae.

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NEZEVAK, Vladislav. "ASSESSMENT OF ENERGY ACCUMULATION SYSTEM IMPACT UPON VOLTAGE LEVEL ON BUSES OF ACTIVE POINT OF DC SECTIONING". Bulletin of Bryansk state technical university 2021, n. 8 (9 agosto 2021): 46–60. http://dx.doi.org/10.30987/1999-8775-2021-8-46-60.

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The work purpose is to estimate and investigate processes of the regenerative braking impact upon a voltage level on object buses of the system of traction power supply at electricity storage systems. In the investigation there are used methods of imitation modeling and analytical ones allowing the fulfillment of calculations for different conditions of the electric traction load formation within the limits of inter-substation areas under consideration. The work novelty consists in the approach to the estimation of the working mode impact of electricity storage systems upon the voltage level on buses of the objects of traction power supply under conditions of regenerative braking and charge characteristics changes. In the course of the investigation there are obtained the following results: the work cyclicity change estimation of a storage system is carried out; the dependence of a charge depth change upon rated power consumption is defined; charge characteristics for conditions of charge predominance in the diagram are calculated; the character of voltage changes on object buses of the system of traction power supply is defined; the necessity of charge characteristic adaptation depending on conditions of regenerative braking use is defined. The regenerative braking use makes an impact upon charge characteristics formed from the condition of charge predominance in the diagram of a charge degree at the rated interval and allows increasing currents of the second stage of the charge characteristics allowing the decrease voltage loss at charge realization caused by adjacent traction substations at the first stage.

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Chupin, Evgeniy, Konstantin Frolov, Maxim Korzhavin e Oleg Zhdaneev. "Energy storage systems for drilling rigs". Journal of Petroleum Exploration and Production Technology 12, n. 2 (29 dicembre 2021): 341–50. http://dx.doi.org/10.1007/s13202-021-01248-5.

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AbstractEnergy storage systems are an important component of the energy transition, which is currently planned and launched in most of the developed and developing countries. The article outlines development of an electric energy storage system for drilling based on electric-chemical generators. Description and generalization are given for the main objectives for this system when used on drilling rigs isolated within a single pad, whether these are fed from diesel gensets, gas piston power plants, or 6–10 kV HV lines. The article studies power operating modes of drilling rigs, provides general conclusions and detailed results for one of more than fifty pads. Based on the research, a generic architecture of the energy storage module is developed, and an engineering prototype is built. The efficiency of using a hybrid energy accumulation design is proven; the design calls for joint use of Li-ion cells and supercapacitors, as well as three-level inverters, to control the storage system. The article reviews all possible options for connecting the system into a unified rig power circuit, and the optimum solution is substantiated. The research into the rig operating modes and engineering tests yielded a simplified mathematical model of an energy storage unit integrated into the power circuit of a drilling rig. The model is used to forecast the payoff period of the system for various utilization options and rig operating modes. The findings of this study can help to better understand which type of storage system is the most efficient for energy systems with temporary high load peaks, like drilling rigs.

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변재기, Jongkeun Shin, seok-kwon,Son, 곽동걸, 권영철 e 박상배. "Analytical Study on Rapid Accumulation Technology of Cold by Phase PCM Thermal Energy Storage System". Journal of the Korean Society of Mechanical Technology 19, n. 6 (dicembre 2017): 785–91. http://dx.doi.org/10.17958/ksmt.19.6.201712.785.

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