Có 40+ tài liệu thuộc chủ đề "giáo trình dầu khí"
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With the introduction of the first cars 100 years ago, the main task of the generator was to supply electricity for the lights. Figure 1 gives an overview of the different fuel cell types that are presently under development, with their electrolytes, their relevant fuels and oxidants, and their operating temperatures. Among these, the low-temperature cells, namely alkaline fuel cell...
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Second, the fuel cell system offers the potential for approximately 30% higher well-to-wheel energy efficiency. Third, the hydrogen fuel consumed by the fuel cell can be produced from a variety of renewable sources including carbon-free methods such as electrolysis of water.. Compared to pure battery-run electric vehicles, the fuel cell vehicle offers three primary advantages. First, the fuel cell vehicle...
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Fuel cell-powered aircraft have been of long-term interest to the aviation community because of their po- tential for improved performance and environmental compatibility. Only recently have improvements in the technological readiness of fuel cell power plants enabled the first aviation applications. Based on the results of conceptual design studies and a few technology demon- stration projects, a widespread understanding of...
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Fuel cell technology, as a highly efficient energy converter, cou- pled with hydrogen as an energy carrier produced from renewable energy sources is one of the most promising answers to these challenges. Vehicles with fuel cell drive systems are electric vehicles. Public Transportation: Requirements for the Use of Fuel Cell Buses. The next stage in the progression toward greatly re-...
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Hybrid-electric buses typically have better fuel economy and lower emissions than comparable con- ventional buses. How a typical hybrid-electric bus recovers braking energy and reuses it is shown in Figure 2. In this way, a hybrid- electric bus may enjoy further advantages in fuel econ- omy, emissions, or a combination of both. Sizing of the engine in a hybrid-electric bus...
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At the beginning of the automotive century, around 1900–. Schallenberg, it took the electric starter and the starting, lighting, and ignition (SLI) system (created by Charles Kettering on the demand from Henry Leyland for the 1911 Cadillac Model Thirty) to improve the comfort in use of the gasoline engine vehicle sufficiently to outperform others. In addition, Ford’s Model T, in...
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As a proton-exchange membrane fuel cell (PEMFC) can be started instantly at ambient temperatures and can work with air as oxidant without carbon dioxide prob- lems, it is so far the most viable fuel cell (FC) system that has the potential to replace internal combustion engines (ICEs) and batteries for transportation applications to power cars, buses, and personal electric vehicles...
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The battery of the vehicle shown in Figure 1 had a weight of not less than 1800 kg.. It was not until the end of the twentieth century that HEVs became a serious alternative to vehicles propelled by an internal combustion engine. The concerns about the action range limitation are faced with the additional employment of an internal combustion engine...
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Road traffic is one of the major consumers of energy, par- ticularly in western industrialized countries, and globally it exhibits the highest growth rate in energy consumption of all sectors. In the Organisation for Economic Cooperation and Development (OECD) countries, more than 33% of the total final energy consumption goes into the transpor- tation sector, amounting to more than 11%...
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There are different degrees of hybridization from micro- hybrids to extended-range electric vehicles (E-REVs).. The complete range between nonhybridized vehicles and pure battery electric vehicles (EVs) is covered.. Table 1 shows the functionality for full hybrid electric vehicles (full HEVs), plug-in hybrid electric-vehicles (PHEV Full HEV, full heavy electric vehicles. Motivation for Plug-In Hybrid Electric Vehicles and Extended-Range Electric Vehicles....
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Electric two-wheelers (E2Ws) are a category of vehicles in China that includes two-wheel bikes propelled by human pedaling supplemented by electrical power from a storage battery (bicycle-style E2Ws or pedelecs), and low-speed scooters propelled almost solely by electricity (scooter-style E2Ws). In many countries, E2Ws are allowed to operate in the bi- cycle lane and are considered a bicycle from a...
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This article concerns the rationale, history, principal issues, and potential of fuel cell-powered rail vehicles.. Issues include fuel cell type, hydrogen storage, special factors affecting fuel cell rail, and the question of which rail applications are appropriate for hybrid powertrains.. Why Fuel Cell Rail?. They are related by the fact that in many nations nearly 100% of the energy for...
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The successful accomplishment of a space mission is dependent on proper and reliable functioning of the power system of the spacecraft in orbit. The stringent demands on performance including weight, volume, re- liability, durability, and cost make the design of the spacecraft power system a challenging exercise. The different elements of the power system include energy sources, energy converters, energy...
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Table 1 gives an overview of the main outlines of FC types, fuels, and applications that have already been considered.. The improvement of specific military requirements by utilizing FCs, such as reduction of the ship’s signature, increase in efficiency, and increase in the power gener- ation in the ship, is also important for FC-specific mili- tary R&D programs. A rough...
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In the Beginning. With the assistance of fellow Australian Larry Perkins, an engineer and an ac- complished race driver, Tholstrup set out from Perth on the west coast of Australia in the fragile Quiet Achiever (Figure 1(a. An immediate target was to beat the 28 days set by Francis Birtles in 1912 in the first motor vehicle to cross the...
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their weight equals the weight of the water displaced. Thus, the average density of a submersible equals the density of the displaced water.. The weight of the pressure hull is a function of its shape and the choice of construction materials and increases with the design depth. As a consequence, at some design depth, the empty weight of the pressure...
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To place this into perspective, it helps to note that a DC can be considered a special case of an AC where the frequency of the AC is zero (or, as a practical matter, has a frequency having a very long period).. Hopefully, this will give an indication of the breadth and the scope of the AC influence.. From a...
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For a battery, the term ‘capacity’ relates to the ‘charge capacity’, i.e., the total amount of electrical charge Q that can be drawn from the device before a specified cutoff voltage V is reached. In the battery industry, charge capacity is typically measured in ampere-hours (Ah).. Practically, the capacity Q is determined as the integral of the discharge current over...
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The battery voltage during discharging can be ex- pressed in a first-order approximation according to the following equation:. DG ¼ DH T DS ½2 where DG is the Gibbs free energy, DH the enthalpy of reaction, T the absolute temperature, and DS the entropy of the reaction. where F is the Faraday constant and n the number of electrons needed...
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Although the state-of-the-art HEVs provide enhanced fuel econ- omy, in order for them to significantly influence global fuel consumption and the environmental situation they need to be developed further. One of the approaches is moving from micro-HEVs to plug-in HEVs, which have increased utilization ratio of the electric drive train.. A short overview of their charging and specific requirements is...