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Energy Conversion Engineering Conference, 2002. IECEC '02. 2002 37th Intersociety

29-31 July 2004

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Displaying Results 1 - 25 of 166
  • A comparative guide to the main steady-state characteristics of four-element current-source resonant converters

    Publication Year: 2002, Page(s):28 - 32
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (642 KB) | HTML iconHTML

    High-frequency resonant converters possess several advantageous properties that make them well suited for high power density applications, such as on aerospace vehicles. In this paper, a comparison of high frequency resonant converter topologies with four energy storage elements is presented. It first describes how all possible circuit topologies for such converters under current-source and voltag... View full abstract»

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  • A systems model for power technology assessment

    Publication Year: 2002, Page(s):21 - 26
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (919 KB) | HTML iconHTML

    A computer model is under continuing development at NASA Glenn Research Center that enables first-order assessments of space power technology. The model, an evolution of NASA Glenn's Array Design Assessment Model (ADAM), is an excel workbook that consists of numerous spreadsheets containing power technology performance data and sizing algorithms. Underlying the model is a number of databases that ... View full abstract»

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  • Simulation of energy sharing among flywheels in parallel configuration

    Publication Year: 2002, Page(s):15 - 20
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB) | HTML iconHTML

    Flywheel express pallet experiment (FEPE) has been proposed on the international space station to study flywheel energy storage application for space power systems. In support of that effort, simulation of two independent, coaxially rotating flywheels, supplied from a common DC bus, was performed. The simulation procedure was divided into three simple steps. First, both flywheels are charged appro... View full abstract»

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  • Numerical analysis of heat transfer from heating coils

    Publication Year: 2002, Page(s):475 - 479
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (574 KB) | HTML iconHTML

    This work describes the numerical results of the heat transfer from heating coils at different conditions by finite element method. The parametric effects on heat transfer were investigated. The varied parameters included ambient conditions, the diameter and pitch intervals of coils, as well as the shape of the cross-section. The numerical results show that the type of the medium where the heating... View full abstract»

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  • Advanced electrostatically clean solar array panel design using reflective aperture grids

    Publication Year: 2002, Page(s):12 - 14
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (509 KB) | HTML iconHTML

    An improved design for an electrostatically clean solar array (ECSA) is described. The baseline ECSA uses a frontside shield with apertures (FSA) to establish a continuously grounded frontside plane, and cover exposed conductors. The improved design adds a tent-shaped reflective cover onto the FSA which collects the energy that would normally be lost in the area covered by the FSA, including the o... View full abstract»

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  • Analysis of compressed air regenerative braking and a thermally enhanced option

    Publication Year: 2002, Page(s):406 - 411
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB) | HTML iconHTML

    Obtaining a net benefit from regenerative braking is difficult. Various forms of regenerative braking systems have been proposed. They include electric batteries, capacitors, flywheels, and compressed air. Some have been implemented on a limited scale. The benefits of regenerative braking systems are easy to qualitatively describe, but can be challenging to quantify. The potential benefits depend ... View full abstract»

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  • SNAP 2002-a Stirling numerical analysis program a second generation program

    Publication Year: 2002, Page(s):497 - 502
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1044 KB) | HTML iconHTML

    SNAP-a Stirling numerical analysis program was written to fill the need for a user modifiable Stirling thermodynamic design program. The original program was released a few years ago and described in these proceedings recently (Altman, 2001) and on the web (Altman, 2002). It has been significantly extended and improved over the last year in response to feedback from users and requests for added fe... View full abstract»

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  • A MICRO high-temperature superconductor-magnet flywheels with dual function of energy storage and attitude control

    Publication Year: 2002, Page(s):151 - 152
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (439 KB)

    This paper proposes to develop energy storage and power generation system for spacecraft using high-temperature superconductor (HTS)- magnet bearing system. This system consists of an HTS-magnet flywheel energy storage system and a brushless motor/generator. The switching between the modes, the motor commutation and generated voltage rectification will be done by cryogenic HTS PWM power electronic... View full abstract»

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  • The CONTOUR spacecraft power subsystem

    Publication Year: 2002, Page(s):75 - 80
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (779 KB) | HTML iconHTML

    The Johns Hopkins University Applied Physics Laboratory (APL) has developed the CONTOUR (Comet Nucleus Tour) spacecraft for the NASA discovery satellite program. The spacecraft is an octagonal-shaped cylinder with 26.5% efficient triple-junction solar cells mounted on all eight side-panels and one top panel. The coarse solar power control is done using digital shunts while fine control is performe... View full abstract»

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  • Harmonic detection method for HVDC DC-side active power filter

    Publication Year: 2002, Page(s):622 - 628
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB) | HTML iconHTML

    One of the most critical issues associated with APF control is to find an efficient algorithm that can obtain an accurate harmonic reference signal for control purpose. This paper presented two novel methods of the harmonic detection in an advanced active power filter (APF) for the compensation of instantaneous harmonic current components in high voltage direct current (HVDC) transmission system. ... View full abstract»

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  • Lessons learned from California's experience on electric power deregulation

    Publication Year: 2002, Page(s):784 - 790
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (691 KB) | HTML iconHTML

    Lessons learned from the California's experience on electric power deregulation could make the transition to deregulation easier for the other states. California that had not added a major power station even with increasing demand for power due to an emerging digital technology ran short of electricity. Drought conditions throughout the Pacific Northwest had affected the available output of hydroe... View full abstract»

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  • Electric bicycle transportation system

    Publication Year: 2002, Page(s):737 - 739
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB) | HTML iconHTML

    Bicycles offer extremely efficient, pollution-free transportation for urban and suburban areas, and the addition of electric drive eliminates the sweat, extends the range and helps older riders. However, we must recognize the problems that restrict ridership to a hardy few. For the rider, these include danger from autos, stop and go driving on streets not designed and maintained for skinny tires, ... View full abstract»

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  • Jet fuel droplet combustion with and without the convection

    Publication Year: 2002, Page(s):376 - 381
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (751 KB) | HTML iconHTML

    Combustion of stationary JP8 and JP8+100 fuel droplets were studied in low convectional environments for the first time. Although usage of these fuels is quite broad and significant, their fundamental physical properties are not well provided. Our goal is to provide practical parameters such as burning rate constants, burning times of jet fuel droplets by the use of the spherical symmetry in low c... View full abstract»

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  • Conceptual design of high power advanced low mass (HPALM) solar thermionic power system

    Publication Year: 2002, Page(s):7 - 11
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (653 KB) | HTML iconHTML

    The conceptual design of an innovative solar space power system based on thermionic conversion of heat to electricity is in progress. The system is particularly attractive for large power requirements (>20 kW). Solar energy is collected with an inflatable structure, which can be a parabolic reflector or a Fresnel lens or reflector. The solar flux is further concentrated with a secondary concentrat... View full abstract»

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  • Commercialization of flywheel energy storage technology on the international space station

    Publication Year: 2002, Page(s):146 - 150
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB) | HTML iconHTML

    An important mission of the international space station (ISS) is to provide a platform for engineering research and development of commercial technology in low Earth orbit (LEO). Flywheel energy storage technology is an ideal candidate for this mission because, in addition to benefiting the commercial and military satellite industries, it offers significant operating cost savings to the ISS. This ... View full abstract»

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  • A novel fuzzy PD plus repetitive control scheme for inverters

    Publication Year: 2002, Page(s):319 - 324
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (708 KB) | HTML iconHTML

    A fuzzy PD plus repetitive control scheme for single-phase 400 Hz CVCF inverters is presented. The principle of the proposed control scheme is to use a repetitive controller, which performs satisfactorily in steady state, while a fuzzy PD controller improves transient performance whenever the system exhibits an oscillatory or overshoot behavior. The fuzzy PD controller preserves the simple linear ... View full abstract»

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  • 2001 Mars Odyssey electrical power subsystem architecture and flight performance

    Publication Year: 2002
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (403 KB)

    The core architecture of the 2001 Mars Odyssey electrical power subsystem (EPS) is direct energy transfer. This paper will address each of the components-oft EPS and how they work together to provide power to the spacecraft. After a successful launch, Mars Odyssey spent six and a half months in interplanetary cruise on its way to Mars. Upon arrival, the spacecraft performed its N orbit insertion b... View full abstract»

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  • A study on solar hydrogen generation with PEM

    Publication Year: 2002, Page(s):659 - 663
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (557 KB) | HTML iconHTML

    A simulation for solar hydrogen generation through one year was carried out on the base of the experimental data of solar hydrogen generation with PEM cell and our measured data of solar radiation, with taking the matching between the number of solar battery panels and the number of PEM sheets, and the conversion efficiency of solar energy to hydrogen expected for one year was estimated. In the ex... View full abstract»

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  • Harmonic cancellation for HVDC using a novel control scheme

    Publication Year: 2002, Page(s):616 - 621
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (586 KB) | HTML iconHTML

    How to eliminate harmonics is one of the key technologies of high-voltage direct current (HVDC) transmission systems. In order to cancel harmonics, hybrid filters, consisting of passive filter (PF) and active power filter (APF), are employed in some recent projects. This paper proposes a novel scheme, which can take full advantage of passive filter, which is good at canceling low frequency harmoni... View full abstract»

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  • Energy sources for the world's post-petroleum era

    Publication Year: 2002, Page(s):782 - 783
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    America consumes petroleum products at the rate of 18 barrels per year per person. Predicted for the year 2025 is a world population of 9.1 trillion persons. If their standard of living has advanced to that enjoyed by Americans today, then their 18-barrel-a-day per person oil consumption will have exhausted the world's oil resources. Energy conservation and development of alternative energy source... View full abstract»

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  • Validation of international space station electrical performance model via on-orbit telemetry

    Publication Year: 2002, Page(s):45 - 50
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (865 KB) | HTML iconHTML

    The first U.S. power module on international space station (ISS) was activated in December 2000. Comprised of solar arrays, nickel-hydrogen (NiH2) batteries and a direct current power management and distribution (PMAD) system, the electric power system (EPS) supplies power to housekeeping and user electrical loads. Modeling EPS performance is needed for several reasons, but primarily to... View full abstract»

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  • International space station electrical power system performance and operational lessons learned

    Publication Year: 2002
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (425 KB) | HTML iconHTML

    The electrical power system of the International Space Station (ISS) represents the largest space-based power system ever designed. After more than a year of real-time operations of the ISS EPS, numerous power system operations and resource management lessons have been learned. This work first provides details of the electrical power system architecture and electrical system hardware used on the I... View full abstract»

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  • International space station nickel-hydrogen battery on-orbit performance

    Publication Year: 2002, Page(s):106 - 113
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (973 KB) | HTML iconHTML

    International space station (ISS) electric power system (EPS) utilizes nickel-hydrogen (Ni-H2) batteries as part of its power system to store electrical energy. The batteries are charged during insolation and discharged during eclipse. The batteries are designed to operate at a 35% depth of discharge (DOD) maximum during normal operation. Thirty-eight individual pressure vessel (IPV) Ni... View full abstract»

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  • Model to predict performance of all electric transportation with wireless power beams

    Publication Year: 2002, Page(s):731 - 736
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (698 KB) | HTML iconHTML

    A future concept transportation technology is being developed to provide all-electric vehicle recharging while traveling on the roadway for public and private vehicles, utilizing a renewable energy source. These vehicles will have the same range, power and maneuverability currently enjoyed by those powered with the internal combustion (IC) engine. The vehicles will have an electric drive motor (or... View full abstract»

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  • CFD applied to heat pump system design

    Publication Year: 2002, Page(s):470 - 474
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB) | HTML iconHTML

    The effect of nonuniform airflow distribution on the thermal performance of tube-fin heat exchangers in typical outdoor units of residential air-conditioning and heat pump systems is investigated numerically. The impact of the flow nonuniformity on the pressure drop and fan-motor power requirement is also investigated. Two fin types have been investigated, smooth fins and louvered fins. A three-di... View full abstract»

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