University of North Texas Digital Library (University of North Texas) · 1999 · 28 citations · 6 references
Open access
EngineeringCivil EngineeringGeological EngineeringGeotechnical EngineeringHeat TransferThermal AnalysisBorehole StabilityGeothermal Energy SystemsThermal-hydraulic Safety AnalysisCementing TechnologyGrout DesignGroutingHeat Transfer MitigationInfiltrationSeepageThermal ConductivityWater Contamination
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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