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Title: Preliminary study on improvement of cementitious grout thermal conductivity for geothermal heat pump applications

Abstract

Preliminary studies were preformed to determine whether thermal conductivity of cementitious grouts used to backfill heat exchanger loops for geothermal heat pumps could be improved, thus improving efficiency. Grouts containing selected additives were compares with conventional bentonite and cement grouts. Significant enhancement of grout alumina grit, steel fibers, and silicon carbide increased the thermal conductivity when compared to unfilled, high solids bentonite grouts and conventional cement grouts. Furthermore, the developed grouts retained high thermal conductivity in the dry state, where as conventional bentonite and cement grouts tend to act as insulators if moisture is lost. The cementitious grouts studied can be mixed and placed using conventional grouting equipment.

Authors:
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
259414
Report Number(s):
BNL-63195
ON: DE96011986
DOE Contract Number:  
AC02-76CH00016
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Jun 1996
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; GEOTHERMAL HEATING SYSTEMS; ENERGY EFFICIENCY; THERMAL CONDUCTIVITY; GEOTHERMAL ENERGY; GROUTING; HEAT EXCHANGERS; EXPERIMENTAL DATA; BENTONITE; CEMENTS; Geothermal Legacy

Citation Formats

Allan, M L. Preliminary study on improvement of cementitious grout thermal conductivity for geothermal heat pump applications. United States: N. p., 1996. Web. doi:10.2172/259414.
Allan, M L. Preliminary study on improvement of cementitious grout thermal conductivity for geothermal heat pump applications. United States. https://doi.org/10.2172/259414
Allan, M L. 1996. "Preliminary study on improvement of cementitious grout thermal conductivity for geothermal heat pump applications". United States. https://doi.org/10.2172/259414. https://www.osti.gov/servlets/purl/259414.
@article{osti_259414,
title = {Preliminary study on improvement of cementitious grout thermal conductivity for geothermal heat pump applications},
author = {Allan, M L},
abstractNote = {Preliminary studies were preformed to determine whether thermal conductivity of cementitious grouts used to backfill heat exchanger loops for geothermal heat pumps could be improved, thus improving efficiency. Grouts containing selected additives were compares with conventional bentonite and cement grouts. Significant enhancement of grout alumina grit, steel fibers, and silicon carbide increased the thermal conductivity when compared to unfilled, high solids bentonite grouts and conventional cement grouts. Furthermore, the developed grouts retained high thermal conductivity in the dry state, where as conventional bentonite and cement grouts tend to act as insulators if moisture is lost. The cementitious grouts studied can be mixed and placed using conventional grouting equipment.},
doi = {10.2172/259414},
url = {https://www.osti.gov/biblio/259414}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {6}
}