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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
  • Power technology options for nuclear electric propulsion

    Publication Year: 2002, Page(s):114 - 121
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (841 KB) | HTML iconHTML

    On-going studies being conducted under the office of space science (Code S) in-space propulsion program have identified high power (100 kWe) NEP as an enabling technology for space science missions. The benefits of NEP include larger payload fractions, faster and more direct trajectories, and increased power at destination as compared to other propulsion technologies. In order to realize these ben... View full abstract»

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  • Lithium-ion cell technology demonstration for future NASA applications

    Publication Year: 2002, Page(s):297 - 304
    Cited by:  Papers (2)  |  Patents (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (839 KB) | HTML iconHTML

    NASA requires lightweight rechargeable batteries for future missions to Mars and the outer planets that are capable of operating over a wide range of temperatures, with high specific energy and energy densities. Due to their attractive performance characteristics, lithium-ion (Li-ion) batteries have been identified as the battery chemistry of choice for a number of future applications, including p... 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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  • Solid state batteries using thin film technology

    Publication Year: 2002
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (417 KB) | HTML iconHTML

    Solid state battery technology had been developed in a large explosion fashion in recent years. The main influence of this is related to economics and connected with energy production, storage and utilisation. Due to such industrial problems, international collaborative researches become necessary. From the point of electrodes consideration, materials must be light and give high cell voltage and c... View full abstract»

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  • Systems-level optimization of low-temperature thermoelectric waste heat recovery

    Publication Year: 2002, Page(s):583 - 591
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (873 KB) | HTML iconHTML

    The two limiting factors in effective thermoelectric (TE) waste heat recovery are TE conversion efficiency and effective heat exchange design. The following study motivated by recent encouraging results in materials and materials processing, which improves TE conversion efficiency, focuses on the second limiting factor of effective heat exchange design. A numerical model has been developed integra... View full abstract»

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  • COMET Flywheel System™ demonstration

    Publication Year: 2002, Page(s):157 - 160
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB) | HTML iconHTML

    The COMET Flywheel System™ demonstration is a program sponsored by NASA Glenn Research Center to demonstrate coordinated momentum and energy transfer for a suite of fixed-axis flywheels. This work describes how the flight system is integrated with the attitude control system (ACS) and electrical power system (EPS). The goal of the program is to demonstrate the feasibility of combining moment... View full abstract»

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  • Comparison of ISS power system telemetry with analytically derived data for shadowed cases

    Publication Year: 2002, Page(s):100 - 105
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (727 KB) | HTML iconHTML

    Accurate international space station (ISS) power prediction requires the quantification of solar array shadowing. Prior papers have discussed the NASA Glenn Research Center (GRC) ISS power system tool (SPACE: system power analysis for capability evaluation) and its integrated shadowing algorithms. On-orbit telemetry has become available that permits the correlation of theoretical shadowing predict... View full abstract»

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  • Engine emissions modeling for a hybrid electric vehicle

    Publication Year: 2002, Page(s):745 - 750
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (665 KB) | HTML iconHTML

    The objective of this work is the development of engine emissions models for an internal combustion engine of a hybrid electric vehicle. From the vast variety of models initially considered, the following three classes were extensively investigated: static engine maps, dynamic multiple regression linear models, and time delay dynamic neural network models. All the models were built and validated w... View full abstract»

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  • Ultra high-efficiency advanced triple-junction (ATJ) solar cell production at Emcore photovoltaics

    Publication Year: 2002
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB) | HTML iconHTML

    Emcore Photovoltaics is in volume production of high-efficiency multijunction solar cells for spacecraft applications. Emcore's latest product is the advanced triple-junction (ATJ) InGaP/InGaAs/Ge solar cell. The ATJ cell exhibits a beginning-of-life (BOL) minimum average conversion efficiency of 27.5%, making it the highest efficiency flight cell available in the market to date. In this paper, th... View full abstract»

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  • Role of combustion air swirl distribution in a burner on secondary atomization of droplets

    Publication Year: 2002, Page(s):269 - 275
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (636 KB) | HTML iconHTML

    The effect of high shear in the flow on the spray flame characteristic has been examined. The shear was provided using different swirl combination in the inner and outer swirlers in the double concentric swirl burner. The burner allowed independent control of swirl and combustion airflow in the inner and outer annulus of the burner. Phase doppler particle analyzer (PDPA) laser diagnostics have bee... View full abstract»

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  • Hubble Space Telescope on-orbit NiH2 battery capacity performance (1990 to 2002)

    Publication Year: 2002
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    This work summarizes the Hubble Space Telescope nickel-hydrogen (NiH2) battery capacity performance from launch to the present time. Over the life of HST vehicle configuration, equipment degradation and equipment failures have had a significant effect on the capacity of the HST batteries. Changes made to the charge system configuration in order to protect against equipment failures and ... 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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  • Photothermal deflection spectroscopy measurements of an anisotropic superlattice

    Publication Year: 2002, Page(s):581 - 582
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB) | HTML iconHTML

    The temperature field created by periodic heating of an anisotropic, N-layer system is considered. Anisotropic thermal conductivity, nonuniform internal heat generation, and interlayer thermal boundary resistance are all included in the model. The analytic expressions are applied to the photothermal deflection spectroscopy (PDS) method for thermal property measurement with emphasis on super-lattic... View full abstract»

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  • Analysis of a capacitor-based hybrid source used for pulsed load applications

    Publication Year: 2002, Page(s):1 - 6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (625 KB) | HTML iconHTML

    This work examines the operation of a capacitor-based hybrid source supplying a pulsed load. A comprehensive and accurate steady-state analysis of a battery or fuel cell in parallel with a double-layer capacitor supplying a pulsed load is performed. Parasitic elements such as battery or fuel cell internal resistance have been included in the models that are studied in this paper. The focus of the ... View full abstract»

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  • Advanced flywheel technology for space applications

    Publication Year: 2002, Page(s):153 - 156
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (572 KB) | HTML iconHTML

    For spacecraft applications, energy storage sources are required to produce a high yield with minimum size and mass. Flywheel systems have the potential to fill this need while also providing attitude control for the guidance of the craft. Other advantages include on-board peak power management, extended service life (as compared to chemical batteries), and provisions for redundant systems with mi... View full abstract»

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  • A novel DC/AC boost inverter

    Publication Year: 2002, Page(s):629 - 634
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (557 KB) | HTML iconHTML

    This work describes a power conversion circuit topology for single-phase DC/AC boost inverter, based on the DC/DC boost converter. It mainly consists of a full-bridge boost converter, which is capable of providing AC output voltage regulation with low distortion. The proposed inverter performs single power conversion, which minimizes switching losses and attains higher efficiency as compared with ... View full abstract»

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  • Battery reinitialization on the photovoltaic module of the international space station

    Publication Year: 2002, Page(s):94 - 99
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (745 KB) | HTML iconHTML

    The photovoltaic (PV) module on the International Space Station (ISS) has been operating since November 2000 and supporting electric power demands of the ISS and its crew of three. The PV module contains photovoltaic arrays that convert solar energy to electrical power, and an integrated equipment assembly (IEA) that houses electrical hardware and batteries for electric power regulation and storag... View full abstract»

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  • Weight reduction analysis of an ambulance structure

    Publication Year: 2002, Page(s):740 - 750
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB) | HTML iconHTML

    The problem of excessive weight and fuel consumption of an ambulance is addressed in this paper. The environmental issues and rapid increase in the price of fuel has motivated the manufacturers of motor vehicles to look for means of reducing vehicles fuel consumption. One of the issues is the problem of over-design and excessive weight of commercial motor vehicles. A manufacturer of ambulances has... View full abstract»

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  • Thermodynamic analysis of combined system with twostep reaction-comparison among them

    Publication Year: 2002, Page(s):444 - 449
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB) | HTML iconHTML

    In thermal power plants, a large amount of fuel exergy is destroyed during the combustion process. Thus, it seems convenient to consider studies of new systems to reduce irreversibilities in the conversion of chemical exergy into work. Some systems include a gas turbine with chemical-looping combustion where a metal oxide is used as an oxygen carrier. Instead of conventional combustion, the oxidat... View full abstract»

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  • Energy conversion issues for airborne directed energy weapons

    Publication Year: 2002, Page(s):61 - 64
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (645 KB) | HTML iconHTML

    The ability of an airborne directed energy weapon (DEW) to effectively strike a target depends strongly on the ability to develop, deliver, and manage the required energy for the onboard DEW source. The energy flow within various generic airborne DEW systems is examined from power generation to waste heat management. Each airborne DEW system is analyzed by considering the energy flow through an ex... View full abstract»

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  • A numerical study of multicomponent vaporization effects in FCC riser reactors

    Publication Year: 2002, Page(s):525 - 530
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (754 KB) | HTML iconHTML

    The petroleum refining industry uses fluidized catalytic cracking (FCC) to convert heavy feed oil into lighter molecular weight, more valuable components such as olefins, gasoline, and diesel fuel. Hot catalyst particles are used for the conversion, which occurs in a riser reactor. The interphase mixing, vaporization, and chemical reactions are the controlling processes inside the FCC riser. The i... View full abstract»

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  • Optical performance of thin film, inflatable, solar concentrators for illuminating PV arrays

    Publication Year: 2002
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (417 KB)

    Inflatable technology for antennas and solar concentrators is rapidly maturing. Large inflatable paraboloids, developed for space propulsion systems and antennas are now available for ground test of power systems. Inflatable structures can potentially reduce spacecraft weight and decrease the volume required by a power system. Reflective surfaces do not require much mass so that inflatable antenna... View full abstract»

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  • Room flashover and subsequent filling of the structure with smoke

    Publication Year: 2002
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (418 KB) | HTML iconHTML

    This work describes room flashover and subsequent filling of the structure with smoke. Modeling of the progress of the smoke is possible with a variety of available computer codes, thus permitting calculations of temperature and smoke level in different rooms as time progresses. The CFAST computer code (Consolidated model of Fire growth And Smoke Transport) is used to calculate temperatures and sm... View full abstract»

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  • Impacts of radiation heat transfer on NOx calculation in industrial furnaces

    Publication Year: 2002, Page(s):485 - 490
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (827 KB) | HTML iconHTML

    A computational glass furnace model was developed for the glass industry to evaluate the glass furnace performance. GFM simulates the major flow and heat transfer characteristics in both the combustion space and glass melter of the furnace, including fluid mixing, combustion, soot/NOx formation and transport, radiation heat transfer, batch melting, and glass flow. A computational fluid ... View full abstract»

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  • Effective resistive drain design considerations for Ni-H2 batteries and related battery support equipment

    Publication Year: 2002, Page(s):290 - 294
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB) | HTML iconHTML

    This work discusses some fundamental design parameters associated with both spacecraft batteries and commonly used battery cell resistive drain techniques. Also discussed are recommended methods to minimize the possibility of imposing excessive inadvertent and/or intentional reversal voltages across cells within the battery. Often overlooked, or at least not adequately considered, in the battery d... View full abstract»

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