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EFFECT OF BACKFILLING MATERIAL ON GROUND COIL PERFORMANCE.

Author(s) : MEI V. C.

Summary

GROUND-COUPLED HEAT PUMP SYSTEMS USE THE GROUND AS LOW-GRADE SOLAR ENERGY STORAGE MEDIUM. THE EFFECT OF GROUND COIL BACKFILLING MATERIAL HAS NEVER BEEN SERIOUSLY ANALYZED. FOR AREAS WHERE THE SUMMER COOLING LOAD DOMINATES, THE CHOICE OF A BACKFILLING MATERIAL BECOMES VERY IMPORTANT: 1) TO MINIMIZE THE CONTACT RESISTANCE BETWEEN COIL AND SOIL; AND 2) TO MAINTAIN HIGH THERMAL CONDUCTIVITY IN THE BACKFILLING REGION EVEN UNDER VERY DRY GROUND CONDITIONS. THE PAPER PRESENTS A MATHEMATICAL MODEL TO DESCRIBE THE OPERATION OF HORIZONTAL GROUND COILS, WHICH INCLUDES THE EFFECT OF BACKFILLING MATERIAL. THREE DIFFERENT BACKFILLING MATERIALS WERE ANALYZED: CLAY, SAND, AND A FLUIDIZED MIXTURE USED FOR UNDERGROUND CABLE BACKFILLING. THE CALCULATED RESULTS INDICATED THAT THE FLUIDIZED MIXTURE DISSIPATES 47% MORE HEAT THAN THE CLAY AND 23% MORE THAN THE SAND.

Details

  • Original title: EFFECT OF BACKFILLING MATERIAL ON GROUND COIL PERFORMANCE.
  • Record ID : 1989-0279
  • Languages: English
  • Publication date: 1987
  • Source: Source: ASHRAE Trans.
    vol. 93; n. 2; 1845-1857; 6 fig.; 3 tabl.; 9 ref.; discuss.
  • Document available for consultation in the library of the IIR headquarters only.

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