Evaluation of Screw-In Geothermal Heat Exchangers

Evaluate advantages and disadvantages of geothermal heat exchangers that are screwed-in and/or screwed-through the soil vs. conventional geothermal heat exchangers. The screwed-in/through heat exchangers have: a) a helical configuration when installed; b) may be plunge-installed; and/or c) may be pull-installed. Possible benefits per unit of thermal capacity include: lower installation cost; faster installation; reduce or eliminate grout; and/or reduced volume of installation field.