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Effects on thermal storage efficiencies of modifying heat-transport properties of indigenous sandstones

Author

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  • Abdel-Wahed, R.M.
  • Emerson, P.F.
  • Blackshear, P.L.
  • Riaz, M.

Abstract

For conditions encountered in much of the Midwest, an extensive layer of dry sandstones protected by an impermeable limestone roof is accessible for long-term (six-month), high-temperature (T > 100 °C) thermal energy storage. The performance of such storage beds is examined when the thermal properties of sandstones are modified so as to adjust the permeability towards an optimum in order to reduce pumping power. The thermal properties of consolidated St. Peter sandstone, dispersed St. Peter sand, and pelletized St. Peter sand are measured by several techniques. A nondimensional computer model for beds bounded by a constant temperature water table is employed to estimate the influence of thermal property manipulation of storage system performance. Disrupting the sandstone permits a substantial increase in the volume efficiency and first and second law efficiencies. Pelletizing sand into particles of approx. 1 mm diameter permits marginal further increases in performance. Disruption of the consolidated sandstone reduces the thermal diffusivity and increases the permeability. Both effects improve performance.

Suggested Citation

  • Abdel-Wahed, R.M. & Emerson, P.F. & Blackshear, P.L. & Riaz, M., 1979. "Effects on thermal storage efficiencies of modifying heat-transport properties of indigenous sandstones," Energy, Elsevier, vol. 4(2), pages 183-192.
    • Handle: RePEc:eee:energy:v:4:y:1979:i:2:p:183-192
    DOI: 10.1016/0360-5442(79)90119-1
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