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  1. #1
    Join Date
    Jan 2010
    Location
    Scottsboro, Al
    Posts
    19
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    Horizontal ground loop question

    Say a trench was dug to about 8 feet or so and has rock in the bottom of trench. Does the rock help or hurt the transfer of heat once everything is back Filled?

  2. #2
    Join Date
    Dec 2016
    Posts
    30
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    Should have a bed of filler. Rock holds heat. This should be fine.

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  3. #3
    Join Date
    Jun 2012
    Location
    Northern NV
    Posts
    1,894
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    Rock is more conductive than sand..

    Just ensure that the backfill does not press tube into a sharp rock and ruin your day.

  4. #4
    Join Date
    Nov 2006
    Location
    Athens, Ohio
    Posts
    6,992
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    Juan is correct that the rock has better retention properties than sand.

    Check the safety regulations on working in an 8' trench. As I understand it, the requirement is that walls must be reinforced on anything deeper than 5'. It's a hassle but being fined by OSHA is a bigger hassle. And getting buried in a trench can ruin your day.

    There's nothing wrong with horizontal loops but vertical loops have a far greater average depth which yields more capacity.
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  5. #5
    Join Date
    Feb 2019
    Posts
    11
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    Rock is more conductive than dry sand and is less conductive than wet sand.

  6. #6
    Join Date
    May 2018
    Location
    VA/DC
    Posts
    264
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    Horizontals--Wouldnt do it.

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