A Comparative Analysis of Wind Propulsion Systems for Ocean-Going Vessels

2010 ◽  
Author(s):  
Benjamin H. Gully ◽  
Michael E. Webber ◽  
Carolyn C. Seepersad
Keyword(s):  
Alternative Energy ◽  
Operational Parameters ◽  
Propulsion Systems ◽  
Novel Technologies ◽  
Fuel Prices ◽  
Alternative Energy Sources ◽  
Energy Technologies ◽  
Marine Industry ◽  
History Of ◽  
Propulsion Power

Recent increases in fuel prices have spurred interest in energy efficiency and alternative energy technologies. These interests are especially relevant for the marine industry, which is responsible for transporting over 90% of the world’s freight. The present global fleet of commercial ships consumes approximately 200 million tonnes of diesel fuel each year — which is expected to rise to around 350 million tonnes a year by 2020 [5]. Studies have been conducted evaluating technologies to increase seagoing propulsion efficiency as well as harness available alternative energy sources. One renewable source, wind, is particularly interesting since 1) it presents a vast source of free energy that has been used throughout much of the history of marine transportation, and 2) novel technologies are available that might make it attractive for modern ships. The purpose of this analysis is to specifically evaluate and compare the ability of two modern wind-based technologies to produce thrust-reducing propulsion power for use in reducing the fuel consumption of a ship, namely a rigid wing sail and Flettner rotor. The analysis focuses on design specifications for each based on existing literature and compares the performance of the two technologies within a specified, but naturally varying wind environment. The force-producing capabilities of each technology are compared as a function of the ship operational parameters of heading and speed.

scholarly journals ALTERNATIVE MOTORS IN AVIATION

Aviation ◽  
2014 ◽  
Vol 18 (4) ◽  
pp. 174-177 ◽  
Author(s):  
Mirvat Kaddour
Keyword(s):  
Alternative Energy ◽  
Air Travel ◽  
Air Transport ◽  
Energy Sources ◽  
Propulsion Systems ◽  
Fuel Prices ◽  
Advantages And Disadvantages ◽  
Alternative Energy Sources ◽  
Increasing Demand ◽  
Alternative Propulsion Systems

The increasing demand for air travel leads to more pollution produced by air transport. At the same time the fuel prices are constantly rising. Therefore, it becomes necessary to find alternative energy sources for aircraft (alternative fuel, motors). In this article alternative propulsion systems (fuel) that can be used in aviation, their advantages and disadvantages are reviewed.

scholarly journals Support tools of Russia’s oil and gas industry under western sanctions restrictions

2018 ◽  
Vol 26 (4) ◽  
pp. 620-629
Author(s):  
Maxim V Chernyaev ◽  
Anna V Korenevskaya
Keyword(s):  
Russian Federation ◽  
Alternative Energy ◽  
Oil And Gas ◽  
Import Substitution ◽  
Oil And Gas Industry ◽  
External Trade ◽  
Gas Industry ◽  
Fuel Prices ◽  
Alternative Energy Sources ◽  
The Russian Federation

The article discusses the possibilities of promoting the development of the Russian’s oil and gas industry in the current unstable political and economic conditions. The analysis of tools and mechanisms to support the oil and gas industry to ensure energy independence and improve energy security of the fuel and energy complex of the Russian Federation through import substitution of critical technologies, development of legislative and tax measures to stimulate the development of the Russian state company. The authors of the study assess the effectiveness of state and corporate import substitution plans, external trade contracts and markets, as well as provide a forecast of possible ways of development of the oil and gas complex of Russia, taking into account sanctions restrictions, fuel prices and in the future competition with alternative energy sources. The implementation of effective state support for the Russian’s oil and gas industry can contribute to the development of scientific and technological potential of companies to implement the import substitution program, as well as to strengthen the position of the Russian Federation in the global system of energy resources.

scholarly journals Renewable Energy: Non-environmental Reasons to Make the Transition

2017 ◽  
Vol 12 (1) ◽  
pp. 43-48
Author(s):  
Andrew Johnson
Keyword(s):  
Renewable Energy ◽  
Alternative Energy ◽  
Fossil Fuels ◽  
Fossil Fuel ◽  
Energy Sources ◽  
Renewable Sources ◽  
Oil Companies ◽  
Renewable Energy Technologies ◽  
Alternative Energy Sources ◽  
Energy Technologies

Environmentalists continuously push for us, as a country, to decrease our fossil fuel usage and transition to a society powered by renewable energy. The money of oil companies and other corporations persuade our government to continue investing in fossil fuels as opposed to renewable energy. There are, however, other reasons which should convince us as a nation to invest in alternative energy sources. Eliminating our dependence on fossil fuels will benefit the nation economically and prepare us for a rapidly changing future. We, as Americans, should increasingly pursue renewable sources of alternative energy not only for the documented environmental reasons but also because investing in renewable energy technologies will provide jobs for Americans, decrease our dependence on other nations, and benefit the health of all Americans while decreasing our dependence on fossil fuels.

scholarly journals Renewable Energy in Nigeria: Potentials and Challenges

2021 ◽  
Vol 56 (3) ◽  
pp. 528-539
Author(s):  
Chukwuma Chris Okonkwo ◽  
Francis Odikpo Edoziuno ◽  
Adeolu Adesoji Adediran ◽  
Enoch Mayowa Ibitogbe ◽  
Rasheedat Mahamood ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Rural Communities ◽  
Crude Oil ◽  
Alternative Energy ◽  
Fossil Fuels ◽  
Renewable Energy Sources ◽  
Current Status ◽  
Energy Sources ◽  
Alternative Energy Sources ◽  
Energy Technologies

There is a huge renewable potential found in Nigeria which is yet to be explored. The heavy reliance on fossil fuels such as crude oil for its energy production has made it a top contributor to greenhouse gases up to 1.01 % of global emissions. Pertinent efforts have been placed on exploring renewable energy sources given the increased awareness of its sustainability. Furthermore, indicators suggest that crude oil will become a much less significant driver of the energy sector in the coming years. In the light of these issues, this paper presents the potentials that renewable energy has to offer, challenges that could limit its exploitation, and the current status of energy initiatives, including the decade-old renewable energy master plan. Meanwhile, we also discuss the benefits of adopting renewable energy technologies for urban and rural communities. In conclusion, the adverse effect of the exploitation of fossil fuels on the environment, including global warming, glacial meltdown, and acid rain, can be mitigated. Overall, the carbon footprint can be reduced if the potentials are appropriately utilized and converted into an accessible and affordable energy source. Although renewable energy projects have a high initial cost of running over a long life, the cost is small or no compared to conventional sources. The authors recommend the need to explore alternative energy sources that will be environmentally friendly and meet present energy demands.

scholarly journals Lessons from technology development for energy and sustainability

2016 ◽  
Vol 3 ◽  
Author(s):  
M.J. Kelly
Keyword(s):  
Carbon Dioxide ◽  
Alternative Energy ◽  
Technology Development ◽  
New Technology ◽  
Full Range ◽  
Carbon Dioxide Emission ◽  
Energy Technologies ◽  
The World ◽  
History Of ◽  
Level Of Concern

ABSTRACTThere are lessons from recent history of technology introductions which should not be forgotten when considering alternative energy technologies for carbon dioxide emission reductions.The growth of the ecological footprint of a human population about to increase from 7B now to 9B in 2050 raises serious concerns about how to live both more efficiently and with less permanent impacts on the finite world. One present focus is the future of our climate, where the level of concern has prompted actions across the world in mitigation of the emissions of CO2. An examination of successful and failed introductions of technology over the last 200 years generates several lessons that should be kept in mind as we proceed to 80% decarbonize the world economy by 2050. I will argue that all the actions taken together until now to reduce our emissions of carbon dioxide will not achieve a serious reduction, and in some cases, they will actually make matters worse. In practice, the scale and the different specific engineering challenges of the decarbonization project are without precedent in human history. This means that any new technology introductions need to be able to meet the huge implied capabilities. An altogether more sophisticated public debate is urgently needed on appropriate actions that (i) considers the full range of threats to humanity, and (ii) weighs more carefully both the upsides and downsides of taking any action, and of not taking that action.

Development of the algorithm for the selection of a wind generator-based autonomous power supply system

2019 ◽  
Vol 2 (1) ◽  
pp. 8-16 ◽  
Author(s):  
P. A. Khlyupin ◽  
G. N. Ispulaeva
Keyword(s):  
Wind Turbines ◽  
Power Supply ◽  
Alternative Energy ◽  
Power Supply System ◽  
Supply System ◽  
Power Generators ◽  
Energy Devices ◽  
Wind Generator ◽  
Alternative Energy Sources ◽  
Selection Of

Introduction: The co-authors provide an overview of the main types of wind turbines and power generators installed into wind energy devices, as well as advanced technological solutions. The co-authors have identified the principal strengths and weaknesses of existing wind power generators, if applied as alternative energy sources. The co-authors have proven the need to develop an algorithm for the selection of a wind generator-based autonomous power supply system in the course of designing windmill farms in Russia. Methods: The co-authors have analyzed several types of wind turbines and power generators. Results and discussions: The algorithm for the selection of a wind generator-based autonomous power supply system is presented as a first approximation. Conclusion: The emerging algorithm enables designers to develop an effective wind generator-based autonomous power supply system.

Energetic comparison of some stump-removing methods

2014 ◽  
Vol 10 (1) ◽  
pp. 35-51
Author(s):  
I. Czupy
Keyword(s):  
Alternative Energy ◽  
Fossil Fuel ◽  
Alternating Current ◽  
Above Ground Biomass ◽  
Alternative Energy Sources ◽  
Wide Domain ◽  
Fuel Substitution ◽  
Unused Resource ◽  
Root Connection ◽  
Different Soils

Concerns about climate change and fossil fuel shortages are encouraging interest in stumps, as alternative energy sources. Stumps are an almost unused resource in the context of bio fuels. Stump harvesting signifies an intensification of forest management compared with conventional stem-only or above-ground biomass-only harvesting. There are many benefits of stump harvesting. These include: the production of wood fuel, fossil fuel substitution, and improved soil preparation.Removing tree trunks in Hungary has been going on according to the principle of stump extraction, which means stumps are removed by grabbing technology. Experiments have been carried out to reduce the extraction force. In the Great Hungarian Lowland, where large areas require the operation implementation, stump extraction is done by special, hydraulic driven baggers equipped with a special bucket. During operation of the equipment, we carried out measurements of the extraction force and the time requirement. The experiments are designed to carry out the measurements with different soils and different tree species. According to our proposal the suitable force and torque required to remove stumps can be significantly reduced if before the lifting the soil — root connection is loosened. One of the possible ways to implement this task is the use of vibration. Since relatively great vibration power and wide domain of frequency are necessary, therefore we prepared the loosening machinery elements of alternating-current hydraulics system. Based on constructions variants we created a tractor-mounted experimental alternating-current hydraulic stump-loosening machine. It was designed with the ability to produce horizontal vibration in order to loosen stumps.

Sign in / Sign up

Export Citation Format

Share Document