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  • ENERGY PRODUCTION AND CONVERSION  (4)
  • PHYSICAL SCIENCES  (3)
  • 1990-1994  (7)
  • 1
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    Reversible thermodynamic cycle for AMTEC power conversion (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The thermodynamic cycle appropriate to an AMTEC (alkali metal thermal-to-electric converter) cell is discussed for both liquid- and vapor-fed modes of operation, under the assumption that all processes can be performed reversibly. In the liquid-fed mode, the reversible efficiency is greater than 89.6 percent of Carnot efficiency for heat input and rejection temperatures (900-1300 K and 400-800 K, respectively) typical of practical devices. Vapor-fed cells can approach the efficiency of liquid-fed cells. Quantitative estimates confirm that the efficiency is insensitive to either the work required to pressurize the sodium liquid or the details of the state changes associated with cooling the low pressure sodium gas to the heat rejection temperature.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: In: IECEC '92; Proceedings of the 27th Intersociety Energy Conversion Engineering Conference, San Diego, CA, Aug. 3-7, 1992. Vol. 3 (A93-25851 09-44); p. 3.123-3.127.
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  • 2
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    Performance projections of alternative AMTEC systems and devices (1991)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: The alkali metal thermoelectric converted (AMTEC) converts heat to electrical power without moving parts. Attention is presently given to two AMTEC devices that have been optimized for conversion efficiencies of the order of 30 percent or more at 1100 K, in conjunction with high volumetric power densities. A 'tube-bundle' AMTEC configuration yields a peak power of 426 W/l; a flat-plate AMTEC system yields 2.4 W/l.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: In: Space nuclear power systems; Proceedings of the 8th Symposium, Albuquerque, NM, Jan. 6-10, 1991. Pt. 1 (A93-13751 03-20); p. 472-481.
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  • 3
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    Improved Liquid-Electrode/Solid-Electrolyte Cell (1990)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Organic liquid in cathode extends working life. Rechargeable solid-electrolyte electrochemical cell includes novel mixture of organic and inorganic materials in liquid cathode. Operates at temperature about 120 to 170 degrees C lower than sodium/sulfur cells. Offers energy density comparable to that of sodium/sulfur cells - about 10 Wh/kg - and suited to such applications as military systems and electric vehicles.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-17604 , NASA Tech Briefs (ISSN 0145-319X); 14; 4; P. 51
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    NASA TECHNICAL REPORTS
  • 4
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    Vapor-Exposure Cell For Testing Thin-Film Electrodes (1993)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Vapor-exposure test cell (VETC) designed to be used in testing thin-film electrodes on solid electrolytes electrochemically at high temperature. Use of VETC much simpler and less expensive than testing alkali-metal thermal-to-electric converter (AMTEC) fuel cell, electrolysis cell, or other entire device containing solid electrolyte and electrodes of material and configuration to be characterized.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-18620 , NASA Tech Briefs (ISSN 0145-319X); 17; 9; P. 80
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  • 5
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    Series-Connected Vapor/Vapor AMTEC Cells (1993)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Size and weight reduced; operating lifetime increased. Developmental alkali-metal thermal-to-electric converter (AMTEC) in which cells fed from common supply of high-pressure sodium vapor and connected electrically in series. No liquid sodium makes contact with any part of AMTEC cells. Sodium vapor supplied to solid electrolyte of each cell through porous metal anode on upstream side. Proposed design reduces need for high-temperature feedthroughs in that cells internally connected. Power withdrawn through feedthrough at lower temperature without significant thermal loss.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-18667 , NASA Tech Briefs (ISSN 0145-319X); 17; 9; P. 78
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  • 6
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    AMTEC system performance studies using the detailed electrode kinetic and transport model (1992)
    In:  Other Sources
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    Publication Date: 2019-08-27
    Description: A detailed electrochemical model of the alkali metal thermoelectric converter (AMTEC) electrode and current collector grid has been developed recently. Comparative evaluations of the resulting differences in model predictions reveal that the new detailed model predicts up to 50 percent higher electrode power densities at condenser operating temperatures above 600 K. The new model, with experimentally determined parameters, was used to recalculate the projected system performance of previously reported 1- and 100-kWe AMTEC space power systems that had incorporated earlier electrolyte/electrode models. It was found that when the detailed model was used to determine the electrode power densities, enhanced specific power and efficiencies are predicted.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: In: Space nuclear power systems 1989; Proceedings of the 6th Symposium, Albuquerque, NM, Jan. 8-12, 1989. Vol. 2 (A93-20752 06-20); p. 373-378.
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  • 7
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    AMTEC cell testing, optimization of rhodium/tungsten electrodes, and tests of other components (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: Electrodes, current collectors, ceramic to metal braze seals, and metallic components exposed to the high 'hot side' temperatures and sodium liquid and vapor environment have been tested and evaluated in laboratory cells running for hundreds of hours at 1100-1200 K. Rhodium/tungsten electrodes have been selected as the optimum electrodes based on performance parameters and durability. Current collectors have been evaluated under simulated and actual operating conditions. The microscopic effects of metal migration between electrode and current collector alloys as well as their thermal and electrical properties determined the suitability of current collector and lead materials. Braze seals suitable for long term application to AMTEC devices are being developed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: In: Space nuclear power systems; Proceedings of the 8th Symposium, Albuquerque, NM, Jan. 6-10, 1991. Pt. 1 (A93-13751 03-20); p. 464-471.
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