Geothermal Probe

Abstract

The invention relates to a geothermal probe for the exploitation of geothermal heat, comprising a cluster of several closed heat tubes, which for transporting the heat are filled with a two-phase working medium that can be evaporated by means of the geothermal heat and can be condensed in a heat discharging zone. In this case, the respective heat tubes are subdivided over their length into at least a heat receiving zone, a heat transporting zone and a heat discharging zone, at least two heat tubes in the heat receiving zone and/or in the heat transporting zone being of different lengths.

1 . A geothermal probe ( 1 ) for using geothermal heat, having a bundle comprising a number of closed heat pipes ( 2 ) that are filled for heat transport with a two-phase working medium that can be evaporated by means of geothermal heat and can be condensed in a heat output zone, the respective heat pipes being subdivided over their length into at least a heat absorbing zone (H), heat transport zone (N) and heat output zone (K), characterized in that at least two heat pipes ( 2 ) have different lengths in the heat absorbing zone (H) and/or in the heat transport zone (N). 
   
   
       2 . The geothermal probe as claimed in  claim 1 , characterized in that at least two heat pipes ( 2 ) have different diameters in the heat absorbing zone (H) and/or in the heat transport zone (N). 
   
   
       3 . The geothermal probe as claimed in  claim 1 , characterized in that different gas pressures prevail in at least two heat pipes ( 2 ). 
   
   
       4 . The geothermal probe as claimed in  claim 1 , characterized in that different working media are introduced into at least two heat pipes ( 2 ). 
   
   
       5 . The geothermal probe as claimed in  claim 1 , characterized in that the heat pipes ( 2 ) in the heat transport zone (N) are thermally insulated. 
   
   
       6 . The geothermal probe as claimed in  claim 1 , characterized in that the heat absorbing zone (H) of a heat pipe ( 2 ) is located at least at the lower end of said pipe. 
   
   
       7 . The geothermal probe as claimed in  claim 1 , characterized in that a number of heat absorbing zones (H) and heat transport zones (N) are arranged on a heat pipe ( 2 ). 
   
   
       8 . The geothermal probe as claimed in  claim 1 , characterized in that the heat absorbing zones (H) of the individual heat pipes ( 2 ) are arranged in a multistage fashion. 
   
   
       9 . The geothermal probe as claimed in  claim 1 , characterized in that the heat pipes ( 2 ) have at least sectionally axially running protuberances ( 4 ), or there are arranged in the interior guide plates ( 5 ) whose influence targets the transport of the returning condensate. 
   
   
       10 . The geothermal probe as claimed in  claim 1 , characterized in that the heat pipe ( 2 ) has within its walls a spirally running embossment. 
   
   
       11 . The geothermal probe as claimed in  claim 1 , characterized in that the heat absorbing surfaces of the heat pipes ( 2 ) are enlarged by spiral guidance of the heat pipes in the heat absorbing zone (H) around the borehole axis and/or by additional outer ribs. 
   
   
       12 . The geothermal probe as claimed in  claim 1 , characterized in that in the heat absorbing zone (H) the heat pipes are designed at least sectionally as a panel heat exchanger ( 7 ) that wholly or partly grips the inwardly lying heat pipes ( 2 ) of the bundle. 
   
   
       13 . The geothermal probe as claimed in  claim 1 , characterized in that the inner wall of the heat pipes ( 2 ) is rough at least in the region of the heat absorbing zone (H). 
   
   
       14 . The geothermal probe as claimed in  claim 1 , characterized in that at least one heat pipe ( 2 ) is widened at its pipe end in the region of the heat absorbing zone (H). 
   
   
       15 . The geothermal probe as claimed in  claim 1 , characterized in that the heat pipes ( 2 ) are twisted about their own axis in the region of the respective heat absorbing zones (H). 
   
   
       16 . The geothermal probe as claimed in  claim 1 , characterized in that the heat pipe ( 2 ) is made from aluminum or from steel.