scholarly journals The implementation of small-scale hydropower stations in slow flow micro-rivers: a case study of Uzbekistan

2019 ◽  
Vol 135 ◽  
pp. 01036 ◽  
Author(s):  
Dilshod Kodirov ◽  
Obid Tursunov ◽  
Sevarakhon Parpieva ◽  
Nusratillo Toshpulatov ◽  
Kurash Kubyashev ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Fossil Fuels ◽  
Experimental Studies ◽  
Electric Energy ◽  
Point Of View ◽  
Small Scale ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Independent Basis ◽  
Hydropower Stations

Electric energy production in small-scale hydropower stations is attractive from both an ecological and an economical point of view. Technological innovations and measures to lessen environmental impacts make small-scale hydropower stations inexpensive and justified energy sources that provide renewable energy on an independent basis and help not only to protect the environment but also to weaken human dependence on fossil fuels. This study is devoted to finding solutions based on renewable energy technologies and innovations in Uzbekistan. This article is devoted to the development of a water wheel experimental model for the micro-hydroelectric power station. Experimental studies were carried out on the basis of this model and obtained results were used in the preliminary calculations. The results from the calculations showed that the installation can generate 7-11 kWh of electricity per hour, about 168-264 kWh of electricity per day and 61 to 96 MWh of electricity per year.

scholarly journals Experimental Studies on an Inclined Collector Divergent Chimney Pilot Plant

2021 ◽  
Vol 850 (1) ◽  
pp. 012008
Author(s):  
N Rajamurugu
Keyword(s):  
Renewable Energy ◽  
Fossil Fuels ◽  
Low Cost ◽  
Renewable Energy Sources ◽  
Experimental Studies ◽  
High Mass ◽  
Energy Sources ◽  
Solar Pv ◽  
Solar Chimney ◽  
Energy Agency

Abstract Renewable energy sources become suitable valid options to reduce the dependency on fossil fuels or petroleum products. The International Renewable Energy Agency reports that the world will harvest 40% of energy from renewable energy sources by 2030. Conventional technologies such as solar PV technology, consumes higher capital per unit (kWh) of electricity generation cost significantly higher than the traditional sources. Hence, solar chimney power generation system can be suitable option for generating low cost energy. Solar chimneys are developed and tested by different researchers in enhancing the performance of the system. Studies on the geometric modifications of the collector, and chimney are limited. The aim of this paper is to analyse the experimental data obtained from a divergent solar chimney. Experimentation is carried under sunlight in an open atmosphere. The airflow rates in the chimneys are tested under different collector outlet height. The experimental results showed that a chimney with higher collector openings was performed well than other models. The computational analysis is also carried out using ANSYS Fluent software package which shows that the collector opening of 2.5m is recommended for higher high mass flow rate and system efficiency.

scholarly journals The exploitation of western and southern deserts in Iraq for the production of solar energy

2019 ◽  
Vol 9 (6) ◽  
pp. 4617 ◽  
Author(s):  
Ahmed Zkear Abass ◽  
D. A. Pavlyuchenko
Keyword(s):  
Renewable Energy ◽  
Solar Radiation ◽  
Solar Energy ◽  
Fossil Fuels ◽  
Electric Energy ◽  
Energy Resource ◽  
Renewable Energy Resource ◽  
Solar Intensity ◽  
Future Demands ◽  
Basic Features

<span>We have, an overview is presented of the potential future demands and possible supply of solar energy to Iraq. Solar energy, which is clean, unlimited, and environmentally friendly, is presented as a renewable energy resource. Many problems such as CO<sub>2</sub> emissions, industry, human activities, and electricity distribution grids have attracted much attention because of the current state of crude oil production and its prices. Moreover, estimations of solar radiation levels and of the efficiencies of photovoltaics (PVs), concentrated solar power (CSP), and solar chimney towers, have all been investigated. Those systems that combine various sources of energy are called hybrids and they have received much attention in recent decades. The basic features of solar radiation in Iraq are outlined, and the selection of those sites with potential for development of solar plants is based on the local largest solar radiation. Moreover, longitudinal and latitudinal orientation, wind, solar intensity, dust, temperature, rain, humidity, and pollution factors are all considered in the calculation of PV/CSP efficiencies. We know there is an abundance of fossil fuels in Iraq, energy shortages began in 1991 because of the perturbation caused by the full ruin of the country. The obvious renewable energy resource available in Iraq is the solar energy, and its exploitation would provide a means to reduce CO<sub>2</sub> emissions from the burning of fossil fuels and to achieve self-sufficiency of electric energy and export the rest to neighboring countries. Solar energy is becoming increasingly important because of the climatic change in the form of global warming.</span>

scholarly journals Multi-Criteria Decision-Making Approach for the Sustainable Autonomous Energy Generation through Renewable Sources. Studying Zakynthos Island in Greece

2017 ◽  
Vol 7 (1) ◽  
pp. 52 ◽  
Author(s):  
Ioannis Vardopoulos
Keyword(s):  
Energy Source ◽  
Renewable Energy Source ◽  
Decision Making ◽  
Renewable Energy ◽  
Energy Demand ◽  
Hydroelectric Power Station ◽  
Multi Criteria Decision Making ◽  
Hydroelectric Power ◽  
Power Station ◽  
Economic Point

Nowadays, energy demand is considered a notable world problem. The purpose of this study is to define, document and finally select an option of only one renewable energy source system, as to which is considered the most suitable solution from an environmental, social and economic point of view, for the energy independence of Zakynthos Island in Greece. This study examines the following alternatives; Biofuels Production Station, Geothermal Power Station, Hydroelectric Power Station, Solar Power Station and Wind Power Station. In order to determine the optimal renewable energy source, a multi-criteria decision-making approach is followed. The three pillars of sustainability, namely, the environment, the economy and the society, were used as the primary criteria in the context of the under determination goal. A significant number of environmental, economic and social sub-criteria were also developed and were subject to weight evaluation using both pairwise comparison and evaluation through structured interviews. Results, with regard to the delimitations set for the scope of the current study, indicate that solar energy source system is the optimal sustainable alternative.

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.

Exergy Analysis and Optimization of a Building Air Conditioning System in Tropical Climate

2014 ◽  
Author(s):  
Ricardo Salazar ◽  
Enrico Sciubba ◽  
Claudia Toro
Keyword(s):  
Renewable Energy ◽  
Energy Consumption ◽  
Air Conditioning ◽  
Energy Use ◽  
Exergy Analysis ◽  
Electric Energy ◽  
Point Of View ◽  
Primary Sources ◽  
Renewable Energy Consumption ◽  
Air Conditioning System

The space conditioning sector is one of the highest exergy consumers and least efficient from the point of view of primary-to-end-use matching. Exergy analysis can be considered as a reliable tool for analyzing and optimizing energy consumption related to building conditioning systems. The present study presents a comparative exergy analysis of the air conditioning system of the TOTAL S.A. offices located in Caracas, Venezuela to finally achieve a reduction of the global electric energy use of the considered building. Starting from the provided thermal cooling load, different possible cooling chains (primary-to-final energy conversion chain) are considered in order to locate the thermodynamically more efficient one from an exergetic point of view. The internal air handler unit, which provides for the cooled and dehumidified air to the building, is fed by the energy obtained from different possible converters of renewable energy primary sources. Specifically, solar and hybrid photovoltaic-thermal (PV/T) panels coupled with an absorption refrigeration machine and with an ejector refrigeration cycle are analyzed. The study that has been carried on leads to identify the most convenient matching between final use and primary sources allowing to substantially reduce the global non-renewable energy consumption of the considered building.

scholarly journals An approach to increase the power output of Karnafuli Hydroelectric Power Station: A step to sustainable development in Bangladesh’s energy sector

PLoS ONE ◽  
2021 ◽  
Vol 16 (10) ◽  
pp. e0257645
Author(s):  
Fakir Sharif Hossain ◽  
Tahmidur Rahman ◽  
Abdullah Al Mamun ◽  
Omar Bin Mannan ◽  
M. Altaf-Ul-Amin
Keyword(s):  
Power Output ◽  
Electric Energy ◽  
Clean Energy ◽  
Combined Cycle ◽  
Hydropower Plant ◽  
Hydroelectric Power Station ◽  
Prototype Model ◽  
Hydroelectric Power ◽  
Power Station ◽  
Hydrokinetic Turbine

Renewable energy has become the most prominent source of energy to reduce carbon emissions around the globe. Undoubtedly, hydro energy is very much clean energy among other sources. In Bangladesh, hydro energy is available only in a specific southern area contributing several hundred megawatts to the national grid. This paper devotes to assessing the capacity and practicability of a hydropower plant to boost the power output by implementing the combined cycle hydropower system. The proposed method has been developed by 1) studying the existing plant based on surveyed data, 2) selecting the site for installing the hydrokinetic turbine, 3) designing with consideration of numerous constraints of inter dependability, and 4) creating a prototype model to ensure the practicability. Preliminary results show that a significant amount of additional electric energy can be generated from the plant with higher efficiency.

scholarly journals ASSESSMENT OF THE IMPACT OF CONSTRUCTION OF A SMALL HYDROELECTRIC POWER STATIONON THE QUALITY OF ATMOSPHERIC AIR

2020 ◽  
Vol 1 (5) ◽  
pp. 202-206
Author(s):  
B.M. Khuchunaev ◽  
◽  
А. Tashilova ◽  
L. A. Kesheva ◽  
N. V. Teunova ◽  
...  
Keyword(s):  
Power Plants ◽  
Fossil Fuels ◽  
Renewable Energy Sources ◽  
Point Of View ◽  
Environmental Damage ◽  
Hydroelectric Power ◽  
Negative Consequences ◽  
Initial State ◽  
Hydroelectric Power Plants ◽  
The Impact

Environment – a set of components of the natural environment, natural and natural-anthropogenic objects, as well as anthropogenic objects. When carrying out any construction work, it is necessary to assess the impact of emissions of pollutants on the environment. One of the features of the energy sector at the beginning of the 21st century is the strict regulation of its further development with the requirements of preserving a favorable environment and preventing global pollution. This determines the trend towards an increasing role of renewable energy sources and, first of all, the most efficient hydropower. In the world, small energy began to develop in recent decades, this is mainly due to the desire to avoid environmental damage caused by reservoirs of large hydroelectric power plants, with the ability to guarantee energy supply in isolated and inaccessible areas. The creation of small hydroelectric power plants instead of small power plants operating on fossil fuels leads to a significant improvement in the air basin. This article provides an assessment of the ecological state of the territory from the point of view of the possibility of construction of the object and a preliminary qualitative forecast of possible changes in the environment during the implementation of the planned construction works and its negative consequences. Based on the analysis of the initial state of the environment and the forecast of its resistance to man-made impacts, the assessment of the possible impact of the construction object on the environment in accordance with the requirements for environmental documentation was carried out.

scholarly journals Assessment of Failure and Repair Behaviours of the Jebba Hydroelectric Power Station

2018 ◽  
Vol 17 (3) ◽  
pp. 13-19
Author(s):  
Cornelius Temitope Thomas ◽  
Olalekan Ogunbiyi ◽  
Mudathir Funsho Akorede ◽  
Jimi Benjamin Olufeagba
Keyword(s):  
Power Generation ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Power Station ◽  
Frequency Distributions ◽  
Basic Concepts ◽  
Set Up ◽  
Hydropower Stations

Nigeria power generation is circa 4000 MW as at October 2016, this is far less than the national required value.Jebba Hydroelectric Power Station (JHEPS) is one of the three major hydropower stations in the country which its maximumaverage generation value is still less than the rated value of 578.4 MW. This paper presented some basic concepts of analysisof failure and repair. An algorithm was set up to extract the contiguous set of up-times and down-times to determine time-tofail (TTR) and time-to-repair (TTR) events, these events were analyzed for stochastic study. It was observed that the longestup time was 262 days and seen in turbo-alternator unit five, while the shortest was zero day and seen in the entire units exceptthat of unit two. The longest downtime was 133 days and seen in the turbo-alternator of unit one, the least time-to-repair is aday and common to all the units. The frequency distributions for both TTF and TTR showed that 79% of TTF events and 57%of TTR events are distributed in the first 2 classes

scholarly journals Analysis of Performance and Control of DC Microgrids as Electricity Providers for Renewable Energy

2021 ◽  
Vol 317 ◽  
pp. 04032
Author(s):  
Denis ◽  
Enda Wista Sinuraya ◽  
Jaka Windarta ◽  
Yosua Alvin Adi Soetrisno ◽  
Kurnianto Fernanda
Keyword(s):  
Distributed Generation ◽  
Fossil Fuels ◽  
Service Providers ◽  
Electric Energy ◽  
Electrical Energy ◽  
System Stability ◽  
Small Scale ◽  
Distributed Generators ◽  
Drastic Increase ◽  
And Control

The increase in demand for electrical energy is increasing rapidly, in line with economic growth. In developing the electricity system, electrical energy service providers must provide electrical energy according to demand with good quality. The generation of conventional electric energy systems that use fossil fuels faces depleting fossil fuel sources, poor efficiency, and environmental pollution. This technology is known as Distributed Generation (DG). Distributed Generation (DG) or Micro Grid (MG) is a small-scale power plant located close to the load. The use of distributed generators can improve the entire system's efficiency, reduce transmission losses, reduce pollution, and ensure the continuity of the distribution of electrical energy. However, the drastic increase in the use of DG causes problems in the form of voltage and frequency stability which will be disturbed due to rapid changes in the generation and loading rates. If this is left unchecked, it can harm system security and reliability. A proper control strategy will restore system stability in the event of an imbalance.

Sign in / Sign up

Export Citation Format

Share Document