GROUND WATER PROTECTION ISSUES WITH GEOTHERMAL HEAT PUMPS

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Description

Closed loop vertical boreholes used with geothermal heat pumps are grouted to facilitate heat transfer and prevent ground water contamination. The grout must exhibit suitable thermal conductivity as well as adequate hydraulic sealing characteristics. Permeability and infiltration tests were performed to assess the ability of cementitious grout to control vertical seepage in boreholes. It was determined that a superplasticized cement-sand grout is a more effective borehole sealant than neat cement over a range of likely operational temperatures. The feasibility of using non-destructive methods to verify bonding in heat exchangers is reviewed.

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9 pages

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Allan, M. L. & Philippacopoulos, A. J. October 1, 1999.

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Description

Closed loop vertical boreholes used with geothermal heat pumps are grouted to facilitate heat transfer and prevent ground water contamination. The grout must exhibit suitable thermal conductivity as well as adequate hydraulic sealing characteristics. Permeability and infiltration tests were performed to assess the ability of cementitious grout to control vertical seepage in boreholes. It was determined that a superplasticized cement-sand grout is a more effective borehole sealant than neat cement over a range of likely operational temperatures. The feasibility of using non-destructive methods to verify bonding in heat exchangers is reviewed.

Physical Description

9 pages

Notes

OSTI as DE00759008

Source

  • GEOTHERMAL RESOURCES COUNCIL MEETING, RENO, NV (US), 10/01/1999--10/01/1999

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  • Report No.: BNL--66666
  • Report No.: EF4001
  • Grant Number: AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 759008
  • Archival Resource Key: ark:/67531/metadc712196

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  • October 1, 1999

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 9, 2015, 12:25 p.m.

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Allan, M. L. & Philippacopoulos, A. J. GROUND WATER PROTECTION ISSUES WITH GEOTHERMAL HEAT PUMPS, article, October 1, 1999; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc712196/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.