GEOTHERMAL HEAT EXCHANGE APPARATUS, GEOTHERMAL HEAT UNIT AND METHOD FOR SUPPLYING HEAT ENERGY TO SOIL Russian patent published in 2021 - IPC F24T10/10 

FIELD: heating.

SUBSTANCE: invention relates to a geothermal heat unit and a method associated with the geothermal heat unit. The geothermal heat unit comprises a borehole (2) made in soil, extending into the soil from the surface (1) of the soil and provided with a lower end (4); piping (10, 11, 20, 21) containing a riser pipe (10, 11) provided with a lower end (17) and located in the borehole (2), a downcomer pipe (20, 21) provided with a lower end (4, 13), wherein the lower end (17) of the riser pipe (10, 11) and the lower end (4, 13) of the downcomer pipe (20, 21) are fluidly interconnected in order to provide circulation of the primary working fluid medium in the borehole (2); a riser pipe (10, 11) containing a first heat insulation (25) surrounding the riser pipe (10, 11) at least along a part of the length of the riser pipe (10, 11); a first pump (8) connected with the piping (10, 11, 20, 21), configured to execute circulation of the primary working fluid medium in the riser pipe (10, 11); and a heat exchange connection (30) in communication with the piping (10, 11, 20, 21) for secondary heat exchange with the primary working fluid medium, wherein the riser pipe (10, 11) is located inside the downcomer pipe (20, 21) in the borehole (2); the depth of the borehole (2) is no less than 300 m; and the first pump (8) is configured to execute circulation of the primary working fluid medium in the direction towards the lower end (4) of the borehole (2) through the riser pipe (10, 11) and to the surface (1) of the soil through the downcomer pipe (20, 21).

EFFECT: increasing the heat removal rate and efficiency of the geothermal heat unit.

10 cl, 9 dwg