GROUND WATER PROTECTION ISSUES WITH GEOTHERMAL HEAT PUMPS

Conference · Fri Oct 01 00:00:00 EDT 1999

OSTI ID:759008

ALLAN, M L; PHILIPPACOPOULOS, A J

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.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 759008
• Report Number(s): BNL-66666; EF4001; R&D Project: AS017EECD; EF4001; TRN: AH200035%%2
• Resource Relation: Conference: GEOTHERMAL RESOURCES COUNCIL MEETING, RENO, NV (US), 10/01/1999--10/01/1999; Other Information: PBD: 1 Oct 1999
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
36 MATERIALS SCIENCE
BOREHOLES
CEMENTS
GROUND WATER
GROUND SOURCE HEAT PUMPS
SEALING MATERIALS
GROUTING
HYDRAULIC CONDUCTIVITY
WATER POLLUTION CONTROL
Geothermal Legacy