scholarly journals Srovnání vodní stopy VE Fláje a VE Přísečnice s uvažováním alokace podle ekonomické hodnoty užitků vodní nádrže

Entecho ◽  
2020 ◽  
Vol 3 (2) ◽  
pp. 7-11
Author(s):  
Libor Ansorge ◽  
Pavel Vojtko ◽  
Veronika Hamanová ◽  
Jakub Hrubý ◽  
Martin Dočkal
Keyword(s):  
Power Plants ◽  
Water Footprint ◽  
Economic Value ◽  
State Enterprise ◽  
Hydropower Station ◽  
Water Tank ◽  
Hydroelectric Power ◽  
Water Losses ◽  
The Individual ◽  
Hydropower Stations

CZ: V předloženém článku je popsána srovnávací studie vodní stopy elektrické energie vyráběné ve dvou vodních elektrárnách provozovaných státním podnikem Povodí Ohře na vodárenských nádržích Přísečnice a Fláje v Krušných horách. Pro výpočet vodní stopy byla použita metoda hrubé spotřeby, která uvažuje ztráty vody z nádrže na úrovni výparu z hladiny. Protože výroba elektrické energie na vodárenské nádrži je jen doplňkovým užitkem, který poskytuje vodní nádrž, bylo třeba rozdělit ztráty vody z nádrže mezi jednotlivé užitky poskytované vodní nádrží. Pro alokaci ztrát výparem mezi jednotlivé užitky byla použita alokace na základě ekonomické hodnoty jednotlivých užitků. Ztráty vody alokované na výrobu elektrické energie představují méně než 1 % celkových ztrát. Studie ukázala, že vodní stopa elektrické energie vyráběné ve vodní elektrárně Přísečnice je cca dvakrát větší než vodní stopa elektrické energie vyráběné ve vodní elektrárně Fláje, zejména z důvodu rozdílné morfologie obou nádrží. Hodnota vodní stopy elektrické energie vyrobené v obou posuzovaných elektrárnách je srovnatelná s literárními údaji o vodní stopě vodních elektráren z ČR i světa. EN: The submitted article describes a comparative study of the water footprint of electricity produced in two hydroelectric plants operated by Povodí Ohře, a state enterprise, on the water reservoirs of Přísečnice and Fláje in the Ore Mountains. A gross consumption method was used to calculate the water footprint, which considers water losses from the reservoir at the level of the evaporation from the water surface. Since electricity generation on the water tank is only an additional purpose provided by the water tank, it was necessary to divide the water losses from the reservoir among the various purposes provided by the reservoir. Allocation based on the economic value of the individual purpose was used to allocate losses by evaporation to individual purposes. Water losses allocated to power generation account for less than 1% of total losses. The study showed that the water footprint of the electricity produced in the Přísečnice hydropower station is about 2 times larger than the water footprint produced in the Fláje hydropower station, mainly due to the different morphology of the two reservoirs. The water footprint value of the electricity produced in two hydropower stations assessed is comparable to literary data on the water footprint of hydroelectric power plants from the Czech Republic and the world.

scholarly journals Studies of rational methods of water selection in water intake areas of hydroelectric power plants

2019 ◽  
Vol 97 ◽  
pp. 05041 ◽  
Author(s):  
Farrukh Shaazizov ◽  
Abdulla Badalov ◽  
Alisher Ergashev ◽  
Diyor Shukurov
Keyword(s):  
Water Intake ◽  
Power Plants ◽  
Rectangular Cross Section ◽  
Experimental Studies ◽  
Hydraulic Calculation ◽  
Hydroelectric Power ◽  
Open Flow ◽  
Hydropower Plants ◽  
Hydropower Stations ◽  
Flow Division

Up to 2021, 42 new hydropower stations will be created in Uzbekistan and 32 existing hydropower stations will be repaired. Hydraulic engineering designers face a number of problems with the open flow division nodes in the field, which are part of the hydraulic structures of such hydropower plants. Considering the above, the main objectives of the research were determined: a) development of a refined method for the hydraulic calculation of flow division nodes with a quiet flow regime; b) the development of methods for predicting deformation of the channel in the area of the division node. The studies were carried out using theoretical and experimental studies using the equation for changing the amount of movement, laboratory studies on a hydraulic model, field surveys of existing water intake nodes, as well as analysis of experimental data available in the literature on this issue. Based on the theoretical and experimental studies, recommendations were made for the open flow division nodes. These recommendations are valid for division nodes at a division angle not exceeding 90°, for prismatic channels of rectangular cross section with relatively small bottom slopes. These recommendations are intended for flows with values of B / H = 3 ÷7.

Application of Fuzzy Recognition Model for the Diversion Structures Safety Evaluation at Small Hydropower Stations

2014 ◽  
Vol 687-691 ◽  
pp. 3686-3690
Author(s):  
Ming Li ◽  
Xue Feng Yu ◽  
Yuan Dong Wei
Keyword(s):  
Safety Evaluation ◽  
Hydropower Station ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Power Station ◽  
Small Hydropower ◽  
Recognition Model ◽  
Fuzzy Recognition ◽  
Hydropower Stations

In this passage is about the safety evaluation on the conveyance structure of small hydroelectric power station. Applying Binary comparative indicators to determine the weights and fuzzy recognition model on the conveyance structure of small hydroelectric power station’s assessment. Compared other models with fuzzy recognition model which will be explained in detail in the next section on a specific small hydropower station. The results show that the fuzzy recognition model is feasible and effective on safety evaluation on the conveyance structure of the hydroelectric power station.

Analysis of Efficiency of Use of the Longitudinal-Flow Hydropower Plant Unit of a Micro Hydropower Station without a Dam for Small Rivers

2018 ◽  
Vol 9 (3) ◽  
pp. 439
Author(s):  
Victor G. KRASNOV ◽  
Alaibek D. OBOZOV ◽  
Oleg R. NURISLAMOV
Keyword(s):  
Power Plants ◽  
Flow Characteristics ◽  
Hydropower Plant ◽  
Small Rivers ◽  
Hydropower Station ◽  
Longitudinal Flow ◽  
Hydraulic Power ◽  
Hydraulic Flow ◽  
Alternative Sources ◽  
Hydropower Stations

In the research of alternative sources of energy much attention is paid to hydro energy, in particular, micro hydropower stations, which use rivers’ kinetic energy. This issue is relevant for research. The target of this paper is to analyze the efficiency of longitudinal-flow hydropower plant of a micro hydropower station without a dam for small rivers. The operational efficiency of hydraulic power plants is mainly determined by the interaction of working elements with the hydraulic flow and the utilization level of its characteristics. The features of its usage and the influence of flow characteristics of the hydropower stations efficiency are examined in this paper. Besides, the interaction between the flow and working elements is assessed. The possibility of improving efficiency level by using working elements with changing weight is tested. Moreover, empirical data is used for calculations.

scholarly journals Pengembangan Media Miniatur Pembangkit Listrik Tenaga Air (PLTA) Pada Pembelajaran IPA Kelas IV Sekolah Dasar

2019 ◽  
Vol 4 (2) ◽  
pp. 220-231
Author(s):  
Silvina Noviyanti ◽  
Hamidi Hamidi
Keyword(s):  
Power Plants ◽  
Energy Sources ◽  
Learning Support ◽  
Hydroelectric Power ◽  
Design Development ◽  
Implementation Evaluation ◽  
Expert Team ◽  
Media Research ◽  
The Individual ◽  
Group Trial

This study aims to develop learning media for miniature energy sources of hydroelectric power plants, to determine the validity and practicality of hydropower media. This type of research uses the ADDIE development model (analysis, design, development, implementation, evaluation.) This media was developed and then validated by the validator, including the validation of media experts and learning experts. From the results of the validation, the expert team can find out the feasibility level of the product made. After obtaining the results of validation, then the individual trials were carried out and a small group trial was conducted to determine the practicality of learning media for mini energy sources from the 4th grade hydroelectric elementary school. This researcher has produced a product in the form of a miniature PLTA energy source learning media with the theme of always saving energy, sub-themes of energy sources, learning 2, the contents of the competency learning energy class IV SD energy learning. Learning media for PLTA miniature energy sources developed can be used as learning support media, research is expected to be carried out in order to develop a variety of learning media that are more interesting.

scholarly journals The Water–Economy Nexus of Beef Produced from Different Cattle Breeds

Water ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 2513
Author(s):  
Frikkie Alberts Maré
Keyword(s):  
Water Consumption ◽  
Value Chain ◽  
Water Footprint ◽  
Economic Value ◽  
Sustainable Use ◽  
Production Method ◽  
Value Addition ◽  
Bottom Up ◽  
The Individual ◽  
Economic Value Addition

The sustainable use of water, or any other natural resource for that matter, is not the only factor that should be considered in terms of sustainability, as social equity and economic prosperity are equally important. The objective of this study was to analyse different breeds of beef cattle, following the same production method, in terms of their water footprint and economic value addition for different links in the value chain. A bottom-up approach was applied to identify the breed with the best economic water consumption in terms of beef production. The results indicated that the total WF/kg carcass revealed notable differences between the various breeds. The Bonsmara had the smallest WF/kg carcass, while the Limousin had the largest. The WF/kg of beef for the different cuts (rib eye, topside, and flank) showed large variations between the breeds and between the different cuts of beef from the same breed. In terms of the economic water consumption, the Angus consumed between 4% and 25% less water per rand of economic value addition than the Bonsmara, Simmentaler, Simbra, Limousin, Afrikaner, and Brahman. When the economic water consumption of the individual value links was considered, it was found that Bonsmara had the best figures for cow–calf production, while the Limousin and Simmentaler were the best in terms of feedlot finishing and processing, respectively. These contradicting results showed the importance of a bottom-up approach to ensure that the fallacy of division does not occur and, secondly, that possible problem areas in the value chain are identified and addressed separately.

scholarly journals Analytical Approach to Sampling Estimation of Underwater Tunnels Using Mechanical Profiling Sonars

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1900
Author(s):  
Vitor Augusto Machado Jorge ◽  
Pedro Daniel de Cerqueira Gava ◽  
Juan Ramon Belchior de França Silva ◽  
Thais Mancilha ◽  
Waldir Vieira ◽  
...  
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Hydroelectric Power ◽  
Large Power ◽  
Unmanned Underwater Vehicles ◽  
Power House ◽  
Simulated Environment ◽  
Sonar Sensor ◽  
Power Plant Operation ◽  
Plant Power

Hydroelectric power plants often make use of tunnels to redirect the flow of water to the plant power house. Such tunnels are often flooded and can span considerable distances. Periodical inspections of such tunnels are highly desirable since a tunnel collapse will be catastrophic, disrupting the power plant operation. In many cases, the use of Unmanned Underwater Vehicles (UUVs) equipped with mechanical profiling sonars is a suitable and affordable way to gather data to generate 3D mapping of flooded tunnels. In this paper, we study the resolution of 3D tunnel maps generated by one or more mechanical profiling sonars working in tandem, considering synchronization and occlusion problems. The article derives the analytical equations to estimate the sampling of the underwater tunnels using mechanical profiling sonars (scanning sonars). Experiments in a simulated environment using up to four sensors simultaneously are presented. We also report experimental results obtained by a UUV inside a large power plant tunnel, together with a first map of this environment using a single sonar sensor.

scholarly journals Decentralized Prosumer-Centric P2P Electricity Market Coordination with Grid Security

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4665
Author(s):  
Duarte Kazacos Winter ◽  
Rahul Khatri ◽  
Michael Schmidt
Keyword(s):  
Electricity Markets ◽  
Electricity Market ◽  
Power Flow ◽  
Power Plants ◽  
Optimal Power Flow ◽  
Free Market ◽  
Economic Value ◽  
New Paradigm ◽  
Grid Security ◽  
Virtual Power Plants

The increasing number of prosumers and the accompanying greater use of decentralised energy resources (DERs) bring new opportunities and challenges for the traditional electricity systems and the electricity markets. Microgrids, virtual power plants (VPPs), peer-to-peer (P2P) trading and federated power plants (FPPs) propose different schemes for prosumer coordination and have the potential of becoming the new paradigm of electricity market and power system operation. This paper proposes a P2P trading scheme for energy communities that negotiates power flows between participating prosumers with insufficient renewable power supply and prosumers with surplus supply in such a way that the community welfare is maximized while avoiding critical grid conditions. For this purpose, the proposed scheme is based on an Optimal Power Flow (OPF) problem with a Multi-Bilateral Economic Dispatch (MBED) formulation as an objective function. The solution is realized in a fully decentralized manner on the basis of the Relaxed Consensus + Innovations (RCI) algorithm. Network security is ensured by a tariff-based system organized by a network agent that makes use of product differentiation capabilities of the RCI algorithm. It is found that the proposed mechanism accurately finds and prevents hazardous network operations, such as over-voltage in grid buses, while successfully providing economic value to prosumers’ renewable generation within the scope of a P2P, free market.

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