Method, apparatus, conduit, and composition for low thermal resistance ground heat exchange
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United States of America Patent
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Sep 1, 2015
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app pub date -
Oct 28, 2008
filing date -
Apr 7, 2008
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Abstract
A method, apparatus, conduit, and composition for low thermal resistance ground heat exchange which preferably comprise, include, and/or use one or more of: a thin-walled, highly conductive filament wound conduit/casing formed using a thermosetting plastic composition containing a thermal conductivity enhancer; a grout backfill preferably including a sufficient amount of graphite, coke, or similar additive to provide a thermal conductivity of 3 Btu/hr-ft-° F. and higher; and a drop tube delivery conduit within the casing, the drop tube having radial exterior ribs which extend into the fluid return annulus formed between the interior wall of the casing and the exterior of the drop tube.
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