Added by on 2016-04-09

This is part 2 of a two-part series on vertical geothermal “Earth Tubes”, applied to heating and cooling of greenhouses. In part 1 (, I describe the background behind the project and its performance. In this video, I quickly summarize how the system was built. Related PostsVertical Geothermal Earth Tube (Part 1) – Greenhouse Heating/CoolingVertical Geothermal Earth Tube in New GreenhouseNew Home Scale Indoor Vertical Hydroponics Farm – Part OneVERTICAL HYDROPONICS TUTORIALS | PART 2Growing in shoe organizer vertical planters part 1Part 2 -Testing – Passive Vertical Hydroponics

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  • JohnGuest45 4 years ago

    Got to admire the innovation but i dont think it`s a very effective design for a few reasons. You dont have enough area in 2 bore holes for efficient heat exchange. Heat moves through soil slowly so once the bore hole walls cool to the air temperature you`ll have no more heat available. The air exiting the bore holes will have a high RH% , liquid water is converted into vapour using sensible heat in the bore holes. The sensible heat is now latent heat, which doesnt raise the air temperature.. only the humidity levels.
    The fan will be working harder than it really needs to as the output is being driven by pressurising the bore holes. A U-shaped tube would incur much lower loss and move a lot more air for less cost.

  • Eric Jozwik 4 years ago

    Use a rain gutter down spout for the heat exchanger. No laborious cutting involved. Loved the video.

  • Mike Shea (sheadtree) 4 years ago

    Rudimentary question, how do you keep the wholes from caving in around your tubing?

  • C Ray 4 years ago

    in japan they found @ 16 ft the ground temp is at it's warmest in january, and coldest in july. it takes 6 months for the heat of summer to reach 16 ft and vice versa.