Ground source heat pump system comprising modular subterranean heat exchange units with multiple parallel secondary conduits

A modular subterranean heat exchange unit adapted for connection between the supply and return headers of a conduit system which connects a subterranean heat exchanger with a ground source heat pump in a structure:

• a first primary conduit adapted to be connected to the supply header for receiving heat transfer fluid therefrom;
• an entry manifold connected to the first primary conduit for receiving heat exchange fluid therefrom;
• a plurality of secondary conduits each connected to the entry manifold for receiving heat transfer fluid directly from the entry manifold, wherein the secondary conduits are spaced a distance apart from each other, the common area thereabout being substantially unobstructed, and wherein the secondary conduits are substantially unenclosed, whereby fluid can flow vertically and circumferentially around the secondary conduits;
• an exit manifold connected to the secondary conduits for receiving heat exchange fluid therefrom;
• and
• a second primary conduit connected to the exit manifold and adapted to connect to the return header so that the second primary conduit can receive heat transfer fluid from the secondary conduits and direct the fluid to the return header;
• and wherein the heat exchange unit is formed of a plastic material which is sufficiently flexible to permit the unit to be rolled or folded up prior to installation.