Abstract: An energy exchanger (2) is connected to an earth energy exchanger (18) via a flow line (10) and a return flow line (14). The flow line (10) and the return flow line (14) are both provided with a regulatable stop valve (12, 16). At least one heat-insulated flow pipe (20) is surrounded by a separation pipe (24) in a bore hole (22), whereby a return flow area (28) for circulatory water is connected thereto in a radially outward manner. The return flow area (28) contains at least one return flow pipe (30) connected to the return flow line (14) and a porous filling (38) in addition to being connected, at least on the base of the bore hole (22), to the lower inlet (46) of the flow pipe (20) or the lower inlets (46, 46a) of the flow pipes (20,20a) via one or several through openings (44) in the separation pipe (24).

Abstract: An energy exchanger (2) is connected to an earth energy exchanger (18) via a flow line (10) and a return flow line (14). The flow line (10) and the return flow line (14) are both provided with a regulatable stop valve (12, 16). At least one heat-insulated flow pipe (20) is surrounded by a separation pipe (24) in a bore hole (22), whereby a return flow area (28) for circulatory water is connected thereto in a radially outward manner. The return flow area (28) contains at least one return flow pipe (30) connected to the return flow line (14) and a porous filling (38) in addition to being connected, at least on the base of the bore hole (22), to the lower inlet (46) of the flow pipe (20) or the lower inlets (46, 46a) of the flow pipes(20,20a) via one or several through openings (44) in the separation pipe (24).

Abstract: A soil heat exchanger for effecting an energy exchange between earth soil and an energy exchanger and including a thermoinsulated flow duct arranged in a borehole formed in ground, a pump provided at an end of the flow duct, a shroud pipe surrounding the flow duct and the pump, and a return flow region for return water located radially outwardly of the shroud pipe and including return flow pipes and a porous filling, with the return flow pipe means extending down to a bottom of the borehole and having lateral opening means communicating with an interior of the shroud pipe through the inlet openings of the shroud pipe, with the shroud pipe having its lower end spaced from the bottom of the borehole, and with the lateral openings of the return flow pipes being beneath the lower end of the shroud pipe, and with the porous filling extending from the borehole bottom and at least up to a level above the inlet openings of the shroud pipe.

Abstract: An arrangement for effecting an energy exchange between earth soil and an energy exchanger, and including a soil heat exchanger, and supply and return flow conduits for connecting the soil heat exchanger with the energy heat exchanger, with the soil heat exchanger having a thermoinsulated supply pipe arranged in a borehole formed in ground, a pump provided at an end of the flow duct, a shroud pipe surrounding the flow duct and the pump and having a section with a reduced inner cross-sectional area located beneath the pump and provided with a plurality of lateral inlet openings, and a return flow region for return water located radially outwardly of the shroud pipe and including return flow pipe means, connectable with the return flow conduit, and a porous filling, the return flow region communicating, in the vicinity of a borehole bottom, with an interior of the shroud pipe through the lateral inlet openings provided in the shroud pipe section with a reduced inner cross-sectional area.

Abstract: A heat exchanger is connected via an insulated flow pipe (26) to a pump (28) arranged in a borehole. The flow pipe and the pump are surrounded in the borehole by a protective tube (34) open at the bottom adjacent to a return region (38) which extends radially outward to the wall of the borehole. The return region communicates with the interior of the protective tube. A return line (42) from the energy exchanger contains at least one return pipe (40) which extends approximately to the bottom of the borehole and is subdivided along its length by a plurality of transverse plugs (44). At the transverse plugs, the return water flows through passages arranged on either side of the transverse plugs and penetrates the porous filling (48) surrounding the return pipe. After the transverse plugs, the return water flows out of the porous filling and back through the passages into the return pipe.