scholarly journals Research-and-development of the hit-pump step setting with hydrodynamic kavitation device in complex of systems

Author(s):  
А.А. Асманкіна ◽  
М.Г. Лорія ◽  
О.Б. Целіщев ◽  
O.A. Купіна

Presently all world tendencies of energy are directed on the use and combining of renewable energy sources. Combining of a few renewable energy sources and not renewable results in partial energyindependence. In this work the laboratory setting was investigational on cooling and heating of water.During an experiment principles of Carnot were incorporated, hydrodynamics, recurrent-forward and dynamic compression of gases and many other. The association of a few renewable energy systems offered, here it is evidently rotined on charts, how many sources must be involved for work of the experimental setting. Statements were taken at the different experimental setting work terms for this purpose it was equipped plenty of sensors. Burn-time, pressure, temperature on the different areas of setting controlled remotedly, through mobile application.For theconstructions and estimation of testimonies mathematical model collection adequacy from sensors changes depending on the temperature indexes of external environment, that requires more detailed supervisions depending on time of year and desired temperature in an apartment, therefore and may need for this research more than year.The conducted experiments allowed to get the approximated information for the construction of pressure festering dependences charts from temperatures: exit from a compressor, from a capillary and, directly in a reservoir with a liquid, and similarly pressure from time of action. A research result was become by the built pressure dependences charts from temperatures on four basic areas of setting. For the estimation of testimonies mathematical model collection adequacy from sensors changes depending on the temperature indexes of external environment, that requires more detailed supervisions depending on time of year and desired temperature in an apartment, therefore and may need for this research more than year.Charts are similarly resulted showing, that with each necessary subsequent start, there are less time for achievement of maximal value of pressure in the system is need. Findings enable to build a mathematical model for the further improvement of setting.

2010 ◽  
Vol 297-301 ◽  
pp. 1414-1419 ◽  
Author(s):  
I. Tsikis ◽  
Frank A. Coutelieris

This work presents a mathematical model to support the electrical energy production in a specific area by using Renewable Energy Sources (RES). More precisely, three RES types (namely, wind, solar and hydropower) are considered while biomass is used to satisfy thermal demands. The actual goal of the model is to generate one or more scenarios for the efficient production of electrical energy for a specific area by selecting the most suitable RES in terms of energy efficiency and cost effectiveness. More specifically the decision criteria are the minimization of installation and operational costs produced for each scenario and the maximization of the electrical energy produced by the specific power plant. Finally, feasibility analyses for selected case studies as well as an evaluation against similar best practices are also carried out for each scenario proposed.


2019 ◽  
Vol 114 ◽  
pp. 05001 ◽  
Author(s):  
Oleg V. Marchenko ◽  
Sergei V. Solomin

A review of the methods and models used at the ESI SB RAS to assess the effectiveness of renewable energy sources (RES) was carried out. Criteria were formulated and calculation formulas were given for a preliminary assessment of the competitiveness of renewable energy sources as compared to alternative energy supply options. A mathematical model of the world energy system was considered, where renewable energy sources were described by averaged indicators. The model allows for different scenarios of external conditions to explore the prospects for the development of energy technologies, including renewable energy sources. For the analysis of autonomous energy systems with RES, a simulation model was developed so as to treat the processes of production, consumption, and energy storage in their dynamics. The optimization version of the mathematical model eliminates the need for a pre-assignment of the energy flow control algorithm. In this case, it is possible to study systems with the simultaneous presence of several units of energy storage of various types. For the study of renewable energy sources under market conditions, a model was developed so as to take into account the presence of various decision-making hubs, as well as the impact of governmental regulatory bodies in the market. It was shown that the most efficient mechanism for encouraging the development of renewable energy sources is the creation of a market for "green certificates", with the least efficient renewable energy sources to be subsidized.


IEE Review ◽  
1991 ◽  
Vol 37 (4) ◽  
pp. 152
Author(s):  
Kenneth Spring

2020 ◽  
Vol 1 (2) ◽  
pp. 189-193
Author(s):  
Aisha Naiga ◽  
Loyola Rwabose Karobwa

Over 90% of Uganda's power is generated from renewable sources. Standardised Implementation Agreements and Power Purchase Agreements create a long-term relationship between Generating Companies and the state-owned off-taker guaranteed by Government. The COVID-19 pandemic and measures to curb the spread of the virus have triggered the scrutiny and application of force majeure (FM) clauses in these agreements. This article reviews the FM clauses and considers their relevance. The authors submit that FM clauses are a useful commercial tool for achieving energy justice by ensuring the continuity of the project, despite the dire effects of the pandemic. Proposals are made for practical considerations for a post-COVID-19 future which provides the continued pursuit of policy goals of promoting renewable energy sources and increasing access to clean energy, thus accelerating just energy transitions.


2016 ◽  
Vol 136 (5) ◽  
pp. 459-470 ◽  
Author(s):  
Yuki Tsujii ◽  
Takao Tsuji ◽  
Tsutomu Oyama ◽  
Yoshiki Nakachi ◽  
Suresh Chand Verma

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