Patent ID: 7059131

Claim:
A method for exchanging energy between earthly bodies and an energy exchanger for current generation, the energy exchanger being connected in a circulation process, via a forward-flow line for steam and a return-flow line for circulatory water, to an earth energy exchanger which extends to a steam-generating depth of the earthly body, characterized in that, for forward flow and return flow in the earthly body, use is made of a common bore hole, in which at least one heat-insulated forward-flow pipe is surrounded by a separation pipe which has adjoining it radially outward a return-flow region for circulatory water which contains at least one return-flow pipe connected to the return-flow line and, at least in the lower region, a porous filling and which is connected to a lower inlet orifice of the forward-flow pipe at least at the floor of the bore hole via one or more passage orifices in the separation pipe.