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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
  • Environmental issues associated with superconducting magnetic energy storage (SMES) plants

    Publication Year: 1989, Page(s):1777 - 1782 vol.4
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    Superconducting magnetic energy storage (SMES) is discussed as a developing technology for storing electric energy. Its efficiency is significantly greater than any existing energy storage method. Most of the environmental concerns associated with present-day energy storage devices do not exist with SMES: it does not use or produce harmful chemicals, no dams or other radical changes to the landsca... View full abstract»

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  • Improved energy saving techniques dictate the selection of utilization voltages and equipment

    Publication Year: 1989, Page(s):1767 - 1776 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    It is shown how improved engineering design techniques and selection of the proper equipment and utilization voltage can conserve on energy, as well as produce better resource utilization. These various approaches and techniques, when properly applied, can lead to good energy management as opposed to conventional energy conservation philosophies. A number of electrical design techniques that contr... View full abstract»

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  • Development of the zinc/bromine battery at Johnson Controls Inc

    Publication Year: 1989, Page(s):1311 - 1318 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    The development of a zinc/bromine battery system which combines attractive energy density and a potential for long cycle life at low cost is presented. The battery uses an all-plastic construction that includes carbon-filled polyethylene electrodes. Complexation of bromine lowers its reactivity, thereby minimizing self-discharge and corrosion problems. A 50 kWh zinc/bromine battery designed for te... View full abstract»

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  • Development and testing of a 20 kHz component test bed

    Publication Year: 1989, Page(s):605 - 610 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    A history of the General Dynamics Space Systems Division 20 kHz breadboard, including its current configuration and its role in the SSF program, is presented. Highlights and results of a series of tests conducted on the breadboard are presented. The first test discussed is an acceptance test, which verified the operation of the delivered breadboard, and characterized the main components of the sys... View full abstract»

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  • Optimization of the heat recovery section in combined powerplants

    Publication Year: 1989, Page(s):2535 - 2542 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    An optimization procedure is presented for combined power plant heat recovery boilers (HRBs), which are the components with the greatest single impact on plant cost and efficiency. A calculation code was developed to solve the thermodynamic balance and compute the exergetic losses in a single-pressure HRB. The code was tested on three working fluids (water, ammonia, and a mixture of both). Results... View full abstract»

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  • Indirect emitter temperature measurement

    Publication Year: 1989, Page(s):2859 - 2863 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    In-core tests of thermionic fuel elements that seek to determine converter performance and the extent of emitter fuel swelling require accurate knowledge of emitter temperature. A method has been developed for accurately determining emitter temperature based on fitting calculated results to the unignited-mode (diffusion mode) portion of the I-V curve. A computer-based data acquis... View full abstract»

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  • Reducing energy consumption frees up electrical system capacity

    Publication Year: 1989, Page(s):1755 - 1765 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    The author analyzes how capacitive power factor correction can increase the existing system capacity, increase system loadability, increase power factor, and reduce both voltage drop and I2 R energy losses on the line in the form of heat. This last item alone marginally decreases the air conditioning load, saves energy, and increases electrical distribution equipment l... View full abstract»

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  • Status of zinc-bromine battery development at Energy Research Corporation

    Publication Year: 1989, Page(s):1303 - 1309 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    The author describes development work on a new generation of battery hardware, with a larger active cell area and improved electrolyte flow characteristics. Key issues such as flow uniformity, zinc deposition quality, shunt current losses, and pumping power requirements were examined in the design of the hardware. Results of design studies and battery tests on the hardware are presented, along wit... View full abstract»

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  • Distortion and regulation characterization of a Mapham inverter

    Publication Year: 1989, Page(s):597 - 604 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    Output-voltage total harmonic distortion (THD) of a 20 kHz, 6 kVA Mapham resonant inverter is characterized as a function of its switching-to-resonant frequency ratio, fs/f r, using the EASY5 Engineering Analysis System. EASY5 circuit simulation results are compared with hardware test results to verify the accuracy of the simulations. The effects of load on ... View full abstract»

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  • A conceptual design for an actively cooled high-average-power electron-beam absorber [for space power applications]

    Publication Year: 1989, Page(s):513 - 519 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    A conceptual design of an electron-beam absorber system that uses water as both an energy absorber and a cooling medium is presented. This configuration uses an aluminum window to separate the water absorber from a vacuum beamline. Such an arrangement has several desirable features. First, any necessary reconfiguration for an increase or decrease in run time and/or beam power is minimal. Also, the... View full abstract»

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  • On-board fault management using modeling techniques

    Publication Year: 1989, Page(s):225 - 230 vol.1
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    An expert system (ES) has been developed to perform spacecraft fault management autonomously, allowing the spacecraft to remain operational over an extended period. The system uses model-based reasoning and operates in a closed loop with a simulated spacecraft. The ES interacts with the spacecraft, performing fault management functions on power subsystem components using a technique known as const... View full abstract»

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  • Criteria for establishing nuclear power system radiation levels for a spacecraft

    Publication Year: 1989, Page(s):1251 - 1256 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    An approach for assessing the allowable radiation levels for a nuclear power source is presented. The orbital and nuclear threat environment in which a spacecraft must function is described, and the ability of electronic components to survive in a radiation environment is examined. Options that reduce unacceptable radiation levels emanating from a nuclear power source are discussed. These involves... View full abstract»

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  • A simple analysis on the performance of absorption heat pump system

    Publication Year: 1989, Page(s):2111 - 2116 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The performance of a single-stage LiBr/water absorption heat-pump (AHP) system in its cooling cycle is analyzed. Two important factors of the performance of an AHP are the effectiveness of the solution heat exchanger and the circulation ratio of the LiBr solution to water. In this analysis the cooling coefficient of performance (COP) of an AHP is expressed as an explicit function of the circulatio... View full abstract»

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  • Conceptual design of the Scholz MHD retrofit plant

    Publication Year: 1989, Page(s):979 - 983 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The technical feasibility of an MHD (magnetohydrodynamic) system operating in a commercial electric utility environment was evaluated by means of a site-specific conceptual design study. The study involved the retrofit of an MHD system to an existing coal-fired power plant, the Scholz generating station (Florida, USA), which was selected following evaluations of more than 200 sites. Following site... 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
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    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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  • Recent measurements of the thermionic characteristics of duplex tungsten-niobium converters

    Publication Year: 1989, Page(s):2853 - 2858 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    A computer-controlled data acquisition system is being used to record and store data on the performance and thermal efficiency of a series of diodes as part of an ongoing thermionic fuel element verification program. Cesium vapor is the working gas. A cylindrical converter with a prototype liquid-cesium-graphite reservoir was constructed and its performance measured. The stored data are available ... View full abstract»

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  • Testing of a high-efficiency domestic heating system

    Publication Year: 1989, Page(s):1749 - 1754 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    An energy-loss model of gas-fired domestic boilers operating at partial loads and providing heating and tap water permits the calculation, using experimental parameters, of their cyclic efficiencies, including the effects of tank losses. These results agree with experimental values obtained by testing a prototype combined boiler characterized by a high nominal output (35 kW) and capable of maintai... View full abstract»

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  • A nickel/hydrogen battery for solar applications

    Publication Year: 1989, Page(s):1653 - 1658 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A nickel/hydrogen battery which was developed for energy storage in communication satellites is described. Advantages offered by this battery include long life, low maintenance, and high reliability. These attributes would also be desirable for terrestrial applications, but the cost is prohibitively high. A 7 kWh battery which is currently being evaluated in a series of solar tests using a photovo... View full abstract»

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  • The current status of development of advanced battery electric energy storage systems in Japan

    Publication Year: 1989, Page(s):1297 - 1301 vol.3
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    The authors report on the Advanced Battery Electric Energy Storage Systems Project, which has as its goal the development of a 1 MW/8 MWh class advanced-battery electric energy storage pilot plant having an AC-AC energy efficiency of 70% and a service life of 1500 cycles. The project includes research and development on advanced battery concepts and the development of system technology. The resear... View full abstract»

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  • 20 kHz main inverter unit

    Publication Year: 1989, Page(s):591 - 595 vol.1
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    A proof-of-concept main inverter unit has demonstrated the operation of a pulse-width-modulated parallel resonant power stage topology as a 20 kHz AC space power source driver, showing simple output regulation, parallel operation, power sharing and short-circuit operation. The use of a two-stage DC input filter controls the electromagnetic compatibility (EMC) characteristics of the DC power bus, a... View full abstract»

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  • Aerospace applications of sodium batteries using novel cathode materials

    Publication Year: 1989, Page(s):2921 - 2926 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    Preliminary fundamental investigations aimed at evaluating sodium metal chloride systems for future aerospace applications are described. Since the sodium metal chloride systems are relatively new, the approach has been to characterize their fundamental properties in order to understand their limitations. To this end, a series of fundamental electrochemical investigations has been carried out, the... View full abstract»

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  • A safe long-life high energy stabilized nickel-zinc rechargeable battery

    Publication Year: 1989, Page(s):1677 - 1682 vol.3
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A zinc/nickel-oxide rechargeable battery using a chemistry that results in stable performance of the zinc anode without adversely affecting the nickel electrode is presented. The consequence is a major enhancement of the cycle life capability with retention of the markedly high practical energy density (both gravimetric and volumetric) of the Ni/Zn system. Advanced prototype vented prismatic cells... 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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  • Mathematical optimization of photovoltaic converters for diode lasers

    Publication Year: 1989, Page(s):507 - 511 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    The mathematical optimization of vertical-junction photovoltaic converters for use with diode laser arrays supplying powers of up to 1 MW is discussed. Photovoltaic parameters were optimized using a mathematical model. The optimized converters have 500 single junctions connected in series. The efficiency varies from 41% for a 0.73 μm diode laser to 46% for a 0.83 μm diode laser. The optimum ... View full abstract»

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