Pipe bundle for borehole heat exchangers, has plastic central pipe that is removably arranged along central axis along which several metal heat pipes are helically revolved

摘要

The pipe bundle has several metal heat pipes that helically revolve about a central axis. A plastic central pipe is removably arranged along the central axis such that central pipe is woundable around reel or drum as a ring. An independent claim is included for borehole heat exchanger.