Proceedings of the 24th Intersociety Energy Conversion Engineering Conference

6-11 Aug. 1989

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  • Proceedings of the 24th Intersociety Energy Conversion Engineering Conference IECEC-89 (Cat. No.89CH2781-3)

    Publication Year: 1989
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    Freely Available from IEEE
  • 20 kHz, 25 kVA node power transformer

    Publication Year: 1989, Page(s):2667 - 2671 vol.6
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (436 KB)

    The electrical and mechanical design information and the electrical and thermal testing performed on the 440-208 V RMS, 20 kHz, 25 kVA prototype node transformer are summarized. The calculated efficiency of the node transformer is 99.3% based on core loss and copper loss test data, and its maximum calculated load regulation is 0.7%. The node transformer has a weight of 19.7 lb and has a power dens... View full abstract»

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  • Operating the Solar Mesosphere Explorer with weakened power storage capabilities

    Publication Year: 1989, Page(s):2663 - 2665 vol.6
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (216 KB)

    The precession of the orbit plane of the Solar Mesosphere Explorer Satellite since its launch in October 1981 has result in periods of zero orbital eclipse each year since 1986. This has produced temperatures of 40-60°C onboard the satellite, contributing to the failure of one battery and an extreme decrease in the capability of the other. In 1988, alterations to the mission operations plane b... View full abstract»

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  • Breakdown experiments in gas contaminated vacuum regions

    Publication Year: 1989, Page(s):2657 - 2662 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (464 KB)

    The possibility of using the space vacuum for electrical insulation is under investigation. To predict the gas flow and pressure throughout a given geometry of interconnected regions (i.e. a spacecraft payload), a computer model which includes source terms such as outgassing, leaks, and effluents was developed. For vacuum regions dominated by outgassing the electrical breakdown process is most lik... View full abstract»

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  • A novel fusion approach to space power and propulsion

    Publication Year: 1989, Page(s):2531 - 2534 vol.5
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    A novel fusion scheme that combines the favorable aspects of magnetic and inertial fusion is examined as a potential advanced propulsion scheme that might be utilized for deep space missions and interplanetary travel in the early part of the next century. It makes use of the energy generated by a hot fusion plasma located inside a spherical metallic shell created by ablation of the target inner su... View full abstract»

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  • Atomic-oxygen-resistant polymer for use in the low earth orbit

    Publication Year: 1989, Page(s):2651 - 2655 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (288 KB)

    An oxygen plasma reactor operating at low pressure (3×10-2 torr) was used to reproduce within laboratory samples of an experimental atomic-oxygen-resistant polymide coating a degradation morphology and material mass loss similar to that obtained in low earth orbit. The coating, Kapton AOR92-1, was developed to be used as a flexible Kapton solar array blanket. Material erosion rate... View full abstract»

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  • Magnetic fusion energy and space development

    Publication Year: 1989, Page(s):2525 - 2530 vol.5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (504 KB)

    Large-scale space development will require efficient propulsion and power systems. Magnetic fusion energy conceptual designs are surveyed and indicate that fusion could provide attractive solutions to this need. Using deuterium and helium-3 as fuel gives fusion products that are primarily charged particles and could be guided by magnetic fields to allow high efficiency. The main 21st-century sourc... View full abstract»

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  • LIPS III-burst anneal solar array experiment

    Publication Year: 1989, Page(s):2647 - 2650 vol.6
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (284 KB)

    The burst anneal solar array, which is one of three solar power experiments developed space deployment on the US Naval Research Laboratory third Living Plume Shield (LIPS III) satellite, is discussed. Burst annealing involves rapidly cycling solar cells to an elevated temperature to completely recover cell damage caused by electron and proton radiation. The LIPS III experimental array consists of ... View full abstract»

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  • Flight experience with LIPS-III

    Publication Year: 1989, Page(s):399 - 404 vol.1
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (372 KB)

    The Satellite LIPS III, the third in the series of living plume shield spacecraft, was launched into a low Earth orbit late in the spring of 1987. Some 140 solar cell experiments were placed on LIPS, and data from these has been acquired for two years. The quality of the current-voltage characteristic measurements is reviewed, and some anomalies in the data are described. In particular, excursions... View full abstract»

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  • Coal combustion and ash collections in high temperature flow

    Publication Year: 1989, Page(s):2517 - 2524 vol.5
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (456 KB)

    An experimental and theoretical study of mechanisms governing coal particle combustion and ash separation is presented. A high-temperature countercurrent combustor and an inertial separator were studied for a range of conditions in which sticking ash appeared. The performance of a rotational-flow combustor and a multicyclone-type ash separator were strongly influenced by gas scavenging. Changes in... View full abstract»

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  • Crew emergency return vehicle: electrical power system design study

    Publication Year: 1989, Page(s):2641 - 2645 vol.6
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (316 KB)

    A crew emergency return vehicle (CERV) is proposed to perform the lifeboat function for the manned space station Freedom. This escape module will be permanently docked to Freedom and, on demand, will be capable of safely returning the crew to Earth. The unique requirements that the CERV imposes on its power source are presented, power source options are examined, and a baseline system is selected.... View full abstract»

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  • Performance analysis of grid connected induction generators driven by hydro/wind turbines including grid abnormalities

    Publication Year: 1989, Page(s):2045 - 2050 vol.4
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (388 KB)

    The author assesses the steady-state and transient behavior of an induction generator (IG) driven by mini hydro or wind turbines under grid abnormalities, as encountered in practice. Behavior under varying input power typically observed in wind machines is also reported. A computer simulation study was undertaken, and results on a 220-kW hydro machine and 55-kW wind machine, indicating the effect ... View full abstract»

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  • MULTI-FOIL thermal insulation for the Dynamic Isotope Power System

    Publication Year: 1989, Page(s):1115 - 1120 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (688 KB)

    A study is presented of the Dynamic Isotope Power System (DIPS), which utilizes MULTI-FOIL insulation around its heat sources in order to minimize thermal losses, reduce weight, and provide emergency cooling in the event of a power conversion subsystem malfunction. DIPS uses a closed Brayton power conversion cycle to convert the isotope decay heat to electrical power. Temperatures within the heat ... View full abstract»

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  • Common pressure vessel nickel hydrogen battery development

    Publication Year: 1989, Page(s):1381 - 1386 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (176 KB)

    The authors present a two-cell series-connected common pressure vessel battery. The prototype unit is of 40-Ah size. In comparison with two 40 Ah IPVs (individual pressure vessels) to which it is equivalent in power, it offers a 19% improvement in energy density. It also offers a 30% reduction in volume and a nearly 50% reduction in the battery footprint on the thermal radiator wall of a communica... View full abstract»

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  • Ion cleaning of silicone-based contaminants

    Publication Year: 1989, Page(s):393 - 398 vol.1
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (324 KB)

    The use of low-energy (25-100 eV) ions to remove silicone-based polymer films from spacecraft operational and optical surfaces by controlled sputtering to avoid damage to the substrate surfaces was investigated. The source of contamination was McGann-Nusil 2566 which was heated to deposit a film on the front surface of a temperature-controlled quartz crystal microbalance (TQCM). Removal of the sil... View full abstract»

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  • System simulation and comparison of advanced flue gas clean-up processes in coal-fired power plant using SALT code

    Publication Year: 1989, Page(s):2511 - 2516 vol.5
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (328 KB)

    The authors report on the use of the System Analysis Language Translator (SALT) computer code to evaluate the cleanup performance and cost of several advanced flue-gas cleanup (FGC) processes, including fluidized-bed copper oxidization (FBCO), fluidized-bed sodium absorption (FBSA), electron-beam/spray-dryer (EBSD), and electron-beam/ammonia-injection (EBAI) processes. The simulation results show ... View full abstract»

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  • Compatibility of large space based power systems with environmental sensors

    Publication Year: 1989, Page(s):2631 - 2640 vol.6
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (668 KB)

    A methodology is presented for viewing various interactions between power systems and the environment that affect the longevity, calibration, maintenance, and accuracy of sensors. The analysis uses the low-earth-orbit environment and interactions with the space station power system as a case study in system compatibility. Space-based power systems and sensor systems are described, compatibility mo... View full abstract»

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  • An investigation into the potential of the reversed Stirling cycle heat pump

    Publication Year: 1989, Page(s):2401 - 2406 vol.5
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (380 KB)

    The validation of a theoretical model of a Stirling cycle heat pump, which involved the construction of a practical prototype machine, is described. The model is used to investigate the potential COP and specific performance which could be achieved by a full-size machine, for use in industrial waste recovery. It is shown that by a suitable choice of design parameters a commercial-size machine, of ... View full abstract»

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  • The probable source of certain spurious frequencies found in the output of a variable speed generating system using slip recovery

    Publication Year: 1989, Page(s):2041 - 2044 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (300 KB)

    As part of US-Department-of-Energy-sponsored research on wind energy, a Mod-0 wind turbine was used to drive a variable-speed, wound-rotor, induction generator. Energy resulting from the slip frequency voltage in the generator rotor was rectified to DC, inverted back to utility frequency AC, and injected into the power line. Spurious changing frequencies displayed in the generator output by a spec... View full abstract»

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  • High power density generator concepts for aerospace electric power

    Publication Year: 1989, Page(s):1109 - 1114 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (396 KB)

    A parametric design study for high-power-density electric generators was performed to assess the merits of the axial gap approach developed at the Oak Ridge National Laboratory. Rotor plate stress calculations, thermal analyses, and shaft and bearing evaluations were performed with generator speed and power levels as the primary variables. The speed range of 3000 to 100000 r.p.m. and power levels ... View full abstract»

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  • Physical examination of high capacity nickel-hydrogen battery cells

    Publication Year: 1989, Page(s):1371 - 1374 vol.3
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (296 KB)

    In order to assess cell cycle performance and possible failure modes, some randomly selected nickel-hydrogen (Ni/H2) battery cells of 83 Ah capacity were put through a rapid cycle test at 80% depth of discharge (DOD) using simulated low-earth-orbit conditions. A destructive physical analysis (DPA) was performed on several cells following the cycle tests. After nearly 1000 charge/dischar... View full abstract»

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  • Environmentally-induced discharges in solar arrays

    Publication Year: 1989, Page(s):385 - 391 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (412 KB)

    An investigation of the behavior of solar array segments in active environments has been conducted to quantify their behavior. The study was directed toward understanding the characteristics of geomagnetic charging in geosynchronous orbits and high-voltage behavior in dense thermal plasma environments at lower altitudes. The charging characteristics were found to be due to the material characteris... View full abstract»

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  • Heat and mass transfer effects in PEM fuel cells

    Publication Year: 1989, Page(s):1637 - 1640 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (292 KB)

    Thermal and water management procedures in proton exchange membrane (PEM) fuel cells that influence stack performance are described. The characteristics of ion exchange membranes, mass and heat transfer effects, and thermal effects are discussed. Various design options for successful PEM stack operation are proposed. Humidification strategies result in opportunities both for thermal control and fo... View full abstract»

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  • An application study of a fluidized bed coal gasification MCFC power plant

    Publication Year: 1989, Page(s):2505 - 2509 vol.5
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (192 KB)

    Future prospects of a fluidized-bed, coal-gasified power generation system that concurrently produces methanol are discussed. Two systems were studied. One is a 500 MW class coal-gasified system that produces the methanol. The other is a 30 MW class, dispersed type, methanol-fueled, internal reforming system that uses the methanol produced by the first system. The conceptual design of both systems... View full abstract»

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  • Coupling of environmentally-induced discharge transients into space power distribution systems

    Publication Year: 1989, Page(s):2623 - 2630 vol.6
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (484 KB)

    The mechanism of space-plasma-induced discharge and its coupling with a large space power system are discussed. Data from both ground and flight experiments are reviewed to obtain an expected basis for the interactions. These concepts were applied to the space station solar arrays and distribution system. The effect of discharges was found to be a function of the discharge site. For most sites in ... View full abstract»

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