Metallic phase-change materials for solar dynamic energy storage systems

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Description

Solar (thermal) dynamic power systems for satellites require a heat storage system that is capable of operating the engine during eclipse. The conventional approach to this thermal storage problem is to use the latent heat of fluoride salts, which would melt during insolation and freeze during eclipse. Although candidate fluorides have large heats of fusion per unit mass, their poor thermal conductivity limits the rate at which energy can be transferred to and from the storage device. System performance is further limited by the high parasitic mass of the superalloy canisters needed to contain the salt. This report describes a ... continued below

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Pages: (39 p)

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Lauf, R.J. & Hamby, C. Jr. December 1, 1990.

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Description

Solar (thermal) dynamic power systems for satellites require a heat storage system that is capable of operating the engine during eclipse. The conventional approach to this thermal storage problem is to use the latent heat of fluoride salts, which would melt during insolation and freeze during eclipse. Although candidate fluorides have large heats of fusion per unit mass, their poor thermal conductivity limits the rate at which energy can be transferred to and from the storage device. System performance is further limited by the high parasitic mass of the superalloy canisters needed to contain the salt. This report describes a new thermal storage system in which the phase-change material (PCM) is a metal (typically germanium) contained in modular graphite canisters. These modules exhibit good thermal conductivity and low parasitic mass, and they are physically and chemically stable. Prototype modules have survived over 600 melt/freeze cycles without degradation. Advanced concepts to further improve performance are described. These concepts include the selection of ternary eutectic alloys to provide a wider range of useful melting temperatures and the use of infiltration to control the location of liquid alloy and to compensate for differences in thermal expansion. 13 refs., 18 figs.

Physical Description

Pages: (39 p)

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OSTI; NTIS; GPO Dep.

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  • Other: DE91007785
  • Report No.: ORNL/TM-11351
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/6241485 | External Link
  • Office of Scientific & Technical Information Report Number: 6241485
  • Archival Resource Key: ark:/67531/metadc1105876

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 1, 1990

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

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  • May 18, 2018, 12:22 p.m.

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Lauf, R.J. & Hamby, C. Jr. Metallic phase-change materials for solar dynamic energy storage systems, report, December 1, 1990; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1105876/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.