DE102007062402A1 - Geothermal energy utilization system installing method for building, involves connecting energy transfer points with heat pumps associated with buildings, respectively, and introducing heat exchanger medium into closed cycle - Google Patents

Abstract

The method involves installing geothermal energy devices (200-1 - 200-9, 300-1 - 300-9) for the withdrawal of heat energy from the earth, where the number of the energy devices depends on the number of buildings (350, 360, 370) to be heated. Each of a set of energy transfer points (352, 362, 372) of the buildings are connected with a supply line (330) and a return line (340) to form a closed cycle. The energy transfer points are connected with heat pumps (351, 361, 371) associated with the buildings, respectively. A heat exchanger medium e.g. rain water, is introduced into the closed cycle. An independent claim is also included for a system for utilization of geothermal energy for a set of buildings, comprising a number of geothermal energy devices installed in the earth.

Description

The The present invention relates to a system, a method of construction and use of a number of ground-based geothermal devices.

A Heat pump is a machine that uses heat from one low temperature level at the expense of work to a higher level Transported temperature level. A design of a heat pump is For example, a compression heat pump in which the physical effect of the heat of vaporization is used. The compression heat pump therefore has a condenser, a throttle, an evaporator and a compressor. In a closed Flow circuit circulates a refrigerant, that drives the states of matter through the compressor takes liquid and gaseous alternately. Farther For example, there are absorption or adsorption heat pumps.

As heat pump heating, a heat pump can be used for example for heating buildings. As heat sources can basically serve the air, (ground) water or soil. Therefore, for example, an air collector, a ground collector or a solar absorber serves as an evaporator. In the AT 413 302 B These are connected in series and can be bypassed individually with a bypass line.

Around use the geothermal heat for heat pumps too can, collectors are used, which consist of an im Soil laid collector line for a heat transfer medium consist. About the heat carrier, the through the refrigerant of the heat pump itself or through a standing with this refrigerant in the heat exchange Medium can be formed, heat is removed from the soil, which is cooled accordingly.

Earth collectors are again known in various designs. From the DE 31 14 262 A1 is an earth collector with star-shaped laid earth probes known that have a length of 12 m to 50 m and are introduced accordingly deep into the soil. Furthermore, well-like earth collectors are for example from the AT 379 892 , of the AT 369 887 or the DE 39 13 429 A1 known, wherein the well-like Erdöffnung is filled by a mushy flowable mud.

Farther Flat collectors are known, with a collector line is laid within a given collector area. It can with respect to the earth's surface between horizontally and vertically installed collectors.

A horizontally routed horizontal collector is for example from the AT 406 521 B known. There, a drainage drainage is provided, which should also cause ventilation of the ground collector with air, which is heated by a solar panel. From the DE 102 00 106 A1 is also a horizontal collector known, which additionally has a drainage system for rainwater, since the heat transfer from wet soil to dry soil should be 2: 1. The pipes of the earth collector are laid from two deep trenches by means of a horizontal drilling rig. To form a continuous pipe system, the ends of the pipes are connected by connecting arcs.

A vertical collector is for example from the US 4,106,555 known. There is a good heat conducting plate made of steel, are welded to the metal pipes. For improved heat transfer and rust protection, the plate is provided with a grease. In addition, a separate, automated irrigation system is provided, which allows humidification of the steel plate. From the DE 29 13 333 C2 is also a vertical collector with an upright arranged elongated plate-shaped metallic heat exchanger element also known with a high thermal conductivity, to which a pipe is welded to the inlet and outlet of a heat exchange medium. The heat exchanger element has a cutting edge in order to drive it vertically downwards into the ground in its longitudinal direction.

Due to the high weight and the bad environmental compatibility of metal pipes are in the AT 378 260 Tubes made of flexible plastic used. To lay the ground collector, a 0.5 m to 1 m wide trench (50 times the pipe diameter) is excavated, in which the collector is arranged vertically or along the trench walls. The flexible plastic tubes are arranged parallel to each other and fixed to each other by spacers, wherein the spacers have a rail with spring clips, which engage around the tube in three-point contact. To secure the ground collector, the spacers are struck firmly into the ground with an extended tip. A prefabricated element made of flexible tubes and spacers is rolled up to the construction site in the form of a cable reel and only cut to the required length there. The ends of the tubes are connected to a respective associated flow and return manifold and at its other end together to a Umlenkverteilerrohr.

From the EP 1 655 566 A2 is an absorber system known that flexible to different soil or building geometries or -formatio tunnels, for example tunnels. For this purpose, a pipe or hose system of flexible pipes or hoses is attached to a flexible carrier layer. The carrier layer consists of a film, fleece, geotextile, endless or staple fibers made of plastic, such as polyolefin fibers such as polypropylene or polyethylene or polyvinyl chloride.

From the DE 697 22 204 T2 is a district heating device known. In this case, all the maintenance units of the district heating device are arranged laterally of a road surface, wherein each maintenance device has a vertically oriented space. From the DE 29 30 484 a method for operating heat pumps by utilizing earth heat and system for performing the method is known. From the DE 44 43 204 C2 a heat transport system is known which uses a district heating of 120 ° C or 105 ° C in the flow.

Of the Invention is based on the object as efficient as possible Method of constructing a system for using geothermal energy specify.

These Task is performed by a procedure with the characteristics of the independent Claim 1 solved. Advantageous developments are the subject of dependent claims and in the description contain.

As a result, is a method of establishing a system for using geothermal energy intended for a plurality of buildings. In Process steps will be a number of geothermal devices in the soil for the removal of heat energy from the soil built. The geothermal devices are in the Soil introduced. The number of geothermal devices depends on the number of buildings to be heated of the system.

The Geothermal devices are provided with a supply and a Return connected. The flow and the return are preferably tubes with sufficient diameter. The lead and the return serves to transport a heat exchange medium, the piping system installed in the ground, due to its large size Surface also for energy absorption from the soil contributes.

each Building has an energy transfer point, with the flow and with the return to a closed Circuit is connected. In addition, every energy transfer point with a heat pump associated with the respective building connected. In a further process step. becomes a heat exchange medium introduced into the closed circuit. Preferably, the The circuit is vented.

Of the Invention is further based on the object of a system as possible efficient use of geothermal energy.

These Task is performed by the system with the characteristics of the independent Claim 4 solved. Advantageous developments are the subject of dependent claims and in the description contain.

As a result, is a system for using geothermal energy for one Plural of buildings provided. In the ground is one Number of geothermal devices for extracting heat energy built from the ground. A geothermal device points doing a surface, on the heat energy is transported. As cooperating with the geothermal device Heat sources can be groundwater, rainwater, Spring water, river water, sea water or soil serve. The number of geothermal devices depends on the Most of the buildings to be heated of the system. Farther For example, the number of geothermal devices can be the size of each geothermal device and the nature of the heat source be.

One Flow is connected to the earth warming devices. The lead preferably has a tube for transporting a heat exchange medium on. The diameter of the tube of the flow is preferably designed on the heat energy required for all buildings and the possible thermal energy density of the heat exchange medium.

One Return is connected to the geothermal devices. The return preferably has a tube for transporting a Heat exchange medium on. The diameter of the tube of the Return is preferably designed for the all buildings needed amount of thermal energy and the possible thermal energy density of the heat exchange medium.

Each An energy transfer point is for each of the buildings intended. The energy transfer point is preferably trained the amount of thermal energy to be transferred to regulate. For each building is at least one Heat pump provided with the energy transfer point connected is. Each energy transfer point is with the supply and connected to the return to a closed circuit. For the connection, a branch is preferably provided. The branch can, for example, a T-piece of pipe or have a 3-way valve. In the closed circuit is the heat exchanger medium as a flowable Medium provided. As a heat exchange medium is suitable For example, brine or water, a refrigerant or a Mixture of these liquids.

Of the Invention is further based on the object, a use indicate a number of geothermal devices.

These Task is by using the characteristics of the independent Claim 11 solved. Advantageous developments are Subject of dependent claims and in the Description given.

As a result, is a use of a number of ground-based geothermal devices for temperature control of several buildings by means of heat pumps intended. The respective heat pump of each building is with a lead and with a return and with the Geothermal devices joined together in a closed circuit. The number of geothermal devices is on the required Energy amount of all buildings matched.

The The developments described below relate both on the process, as well as on the system as well as on the use and can be combined with each other.

In An advantageous development is provided that the establishment a number of slots are milled into the ground. Each geothermal device is positioned in one of the slots.

each Geothermal device is in a preferred embodiment as a dimensionally stable module with one on a flat support arranged through a continuous pipe system.

A Another training variant provides that the heat exchange medium in the supply, return and geothermal devices has a temperature that is less than or equal to a temperature of the soil is.

According to one Another advantageous development variant is at least one Pump provided with the flow and / or the return for pumping the heat exchanger medium in a closed circuit connected is.

In Another advantageous development is a volumetric flow controller provided with the respective heat pump and the flow and / or the return is connected. The volumetric flow controller is advantageously a proportional controller. Preferably the energy transfer point on the volume flow controller. Of the Volumetric flow controller is designed, the flow rate of the heat exchanger medium through the heat pump from the (primary) circuit (with flow and return) to limit. The limit The flow rate depends on the power the heat pump.

According to one another development variant, a differential pressure regulator is provided, the with the respective heat pump and the flow and / or connected to the return. Preferably, the energy transfer point on the differential pressure controller. Preferably, the differential pressure regulator is formed Pressure fluctuations in the pipes of the flow and the return auszuregeln. This will cause a hydraulic balancing of the supply system allows.

In A particularly preferred embodiment provides that the Energy transfer both the volumetric flow controller as also has the differential pressure controller.

alternative to a volumetric flow controller and / or a differential pressure regulator comes in another, also combinable design variant Heat exchanger with the flow and the return and connected to the heat pump.

Prefers are geothermal devices as vertical geothermal collectors are formed. Alternatively or in combination, one or several geothermal devices as ground probe in deep wells educated.

The training variants described above are both individually as well as in combination particularly advantageous. It can all training variants are combined with each other become. Some possible combinations are in the description the embodiments of the figures explained. These possibilities of combinations shown there However, the training variants are not exhaustive.

in the The invention will be described below by exemplary embodiments explained in more detail by means of drawings.

there demonstrate

1 a schematic representation of a first embodiment variant of a system,

2 a schematic representation of a second embodiment variant of a system, and

3 a schematic representation of a third embodiment variant of a system.

In 1 is a system 300 with a variety of earth collector modules 200 ₁ to 200 ₉ as geothermal devices shown schematically. In the embodiment of 1 are nine earth collector modules 200 ₁ to 200 ₉ in a settlement-related field 310 and further earth collector modules 300 ₁ to 300 ₉ in another field 320 shown schematically. In In practice, a much larger variety of ground collector modules and a much wider variety of fields may be used with ground collectors. This is through points in the 1 indicated. In 1 are Erdkollektormodule two fields 310 . 320 connected to a system. Every field 310 . 320 has a distributor 311 . 321 and a valve 312 . 322 for a lead 330 and a distributor 314 . 324 and a valve 314 . 324 for a return 340 on. The distributor 311 for the lead 330 is with each end area 211 ₁ to 211 ₉ the Erdkollektormodule 200 ₁ to 200 ₉ and the distributor 313 for the return 340 is with each end area 212 ₁ to 212 ₉ the collector modules 200 ₁ to 200 ₉ connected.

The Erdkollektormodule 200 ₁ to 200 ₉ are in a closed circle with forerun 330 and return 340 united so that they form a closed circuit. The lead 330 and the return 340 are in the embodiment of 1 Stubs. leader 330 and return 340 are not directly connected to each other to form the cycle. The cycle arises only when the flow 330 and the return 340 via an energy transfer point 352 . 362 or 372 is connected. This will be the energy transfer points 352 . 362 or 372 opened to the energy needs of the building 350 . 360 . 370 cover up.

For the circulation of a flowable refrigerant - which can also be referred to as a heat exchange medium or heat transfer medium - is in the closed circuit at least one pump 315 . 325 provided, preferably with the flow 330 connected is. Alternatively, a pump may be provided in the return (in 6 indicated). Also, the combination of pumps in the flow and in the return is advantageous. The maximum temperature of the circulating in the circulation heat exchange medium is not greater than the temperature of the soil. The heat exchange medium is heated by the geothermal heat of the surrounding soil. On the side of the lead 330 thus no heat losses occur.

The length of the supply line 330 is not critical, because that's the lead 330 surrounding soil in addition to heating the heat exchange medium may contribute. This is the lead 330 advantageously at least in sections not thermally insulated and preferably laid in the frost-free soil (below the frost limit). The system can therefore be used advantageously as a regional low-temperature Nahheizsystem for heating buildings 350 . 360 . 370 especially residential buildings are used. In double function is preferably provided that the buildings 350 . 360 . 370 preferably in the summer by the system (of course) can be cooled while the waste heat to the ground via the Erdkollektormodule 200 ₁ to 200 ₉ and 300 ₁ to 300 ₉ submit. Preferably, for this purpose, the heat pump 351 . 361 . 371 be bypassed by a bypass. This can also be called natural cooling.

With the lead 330 and the return 340 are energy transfer points 352 . 362 and 372 over branches 355 . 356 . 365 . 366 . 375 . 376 connected. The energy transfer points 352 . 362 and 372 connect that. leader 330 and the return 340 with one for a respective building 350 . 360 . 370 provided heat pump 351 . 361 . 371 , In the embodiment of 1 assign the energy transfer points 352 . 362 and 372 a number of valves 353 . 354 . 363 . 364 . 373 . 374 for the heat exchange medium. At least one of the valves is designed as a differential pressure regulator. Alternatively or in combination with a differential pressure regulator is in a number of buildings 350 . 360 . 370 a heat exchanger (in 1 not shown) provided with the flow 330 and the return 340 connected is.

The Erdkollektormodule 200 ₁ to 200 ₉ and 300 ₁ to 300 ₉ are preferably erected with respect to the earth's surface in the manner of a vertical. These can also be referred to as vertical collectors. Preferably, a number of the Erdkollektormodule 200 ₁ to 200 ₉ and 300 ₁ to 300 ₉ arranged in at least one slot milled into the ground.

Advantageously, the area of the fields 310 . 320 used in double function. For example, the respective area can be used agriculturally. In another advantageous dual function, the area is used by solar panels in two ways to gain usable energy. For example, a photovoltaic system can be built on the surface that feeds the pumps 315 . 325 or heat pumps 351 . 361 . 371 can be connected with electrical energy.

In a method of constructing a system of geothermal earth collectors for a plurality of buildings, a number of earth collector modules are first provided 200 ₁ to 200 ₉ and 300 ₁ to 300 ₉ erected as geothermal devices in the ground. These are used to remove heat energy from the ground. The number of required Erdkollektormodule 200 ₁ to 200 ₉ and 300 ₁ to 300 ₉ depends on the number of buildings to be heated 350 . 360 . 370 of the system. Depending on the nature of the soil and the supply of heat to the collectors, for example by river water, spring water, rainwater, etc., this is possible energy extraction through the Erdkollektormodule 200 ₁ to 200 ₉ and 300 ₁ to 300 ₉ differently. Roughly calculated for 1 kilowatt heat demand about 20 m ² Earth collector surface needed. Used for the total number of, for example, twenty buildings 350 . 360 . 370 For example, a heat demand of 140 kW, so an earth collector area of 2800 m ^{2 is} used. Due to the higher efficiency of the overall system, a higher energy yield and, in particular, a very high heat output for a short time can be achieved.

For the erection of the Erdkollektormodule 200 ₁ to 200 ₉ and 300 ₁ to 300 ₉ First, a number of slots are milled into the ground. For example, an agricultural field with long, milled slots is traversed. This results in only a small excavation, after positioning the Erdkollektormodule 200 ₁ to 200 ₉ and 300 ₁ to 300 ₉ in the slots for flooding the Erdkollektormodule 200 ₁ to 200 ₉ and 300 ₁ to 300 ₉ is used in the slots. The Erdkollektormodule 200 ₁ to 200 ₉ and 300 ₁ to 300 ₉ are as easy as possible for cost-effective positioning and construction. Preferably, the Erdkollektormodule 200 ₁ to 200 ₉ and 300 ₁ to 300 ₉ each case a carrier of a dimensionally stable, dissolvable in the soil, in particular decomposable material.

Preferably before the flooding are the Erdkollektormodule 200 ₁ to 200 ₉ and 300 ₁ to 300 ₉ with the lead 330 and the return 340 connected to the system. Preferably, the flow is 330 and / or the return 340 laid below the frost limit. Every energy transfer point 352 . 362 . 372 every building 350 . 360 . 370 will be with the lead 330 and with the return 340 connected to a closed circuit. Furthermore, every energy transfer point 352 . 362 . 372 with one of the respective building 350 . 360 . 370 associated heat pump 351 . 361 . 371 connected.

are all connections for buildings to be connected followed by a heat exchange medium in the closed circuit introduced. Become more buildings connected to the system, preferably from the outset further tight shut-off points provided by barriers for connection. Also, branch points for connecting more Erdkollektormodule be provided, so that the system as needed is expandable.

For easy insertion of the Erdkollektormodule 200 ₁ to 200 ₉ and 300 ₁ to 300 ₉ into the slots of the soil, every Erdkollektormodul 200 ₁ to 200 ₉ and 300 ₁ to 300 ₉ dimensionally stable formed with a arranged on a flat support continuous pipe system. The slots can be made particularly narrow in this embodiment. An entrance of a person into a slot for positioning an earth collector module 200 ₁ to 200 ₉ and 300 ₁ to 300 ₉ is not necessary.

In 2 another system is shown schematically. Instead of Erdkollektormodulen are in the embodiment of 2 geothermal probes 400 ₁ to 400 ₄ and 500 ₁ to 500 ₄ used as geothermal devices. Several ground probes 400 ₁ to 400 ₄ and 500 ₁ to 500 ₄ are in the embodiment of 2 connected in parallel. The number of geothermal probes 400 ₁ to 400 ₄ and 500 ₁ to 500 ₄ is determined by the number of buildings to be supplied 350 . 360 . 370 and possibly the living space.

The 3 schematically shows a more detailed representation of the connections, security and controls of the system. These are a number of barriers 101 , a number of drains / vents 102 , a number of check valves 103 , a number of mudflaps 104 , a number of heat meters 105 , a number of cap valves 106 , a number of expansion vessels 107 , a number of safety valves 108 , a number of heat exchangers 109 in the buildings 350 . 360 . 370 , a number of regulations 110 , a number of motorized 3-way valves 111 , a number of differential pressure regulators 112 , a number of volumetric flow controllers 113 and / or a number of manometers 114 intended.

Advantageously, an energy transfer point 352 . 362 . 372 a diffusion-proof insulation against condensation. The energy transfer point 352 . 362 . 372 has a much higher efficiency compared to a heat exchanger depending on the temperature difference between flow and return between 10% and 30%. Likewise, by the energy transfer point 352 . 362 . 372 a tendency to sludge avoided by the possible waiver of the heat exchanger. Preferably, only exactly one flow pump 315 provided, preferably closer to the Erdkollektormodulen 200 ₁ to 200 ₉ and 300 ₁ to 300 ₉ of the field 310 as to the energy transfer points 352 . 362 . 372 connected is. The energy transfer points 352 . 362 . 372 are dependent on the power of the heat pump 351 . 361 . 371 dimensioned. Accordingly, the diameters of connecting lines and the branches 355 to 376 to the lead 330 or return 340 dimensioned. The diameters of the pipes of the flow 330 and the return 340 On the other hand, they are adjusted to the total energy requirements of the system.

The pressure expansion vessel 107 is for system pressure equalization at the (energy) field 310 over the cap valve 106 connected. The safety valve 108 is to reduce overpressure in the flow 330 or return 340 educated. Every Ge buildings 350 . 360 . 370 is by means of a shut-off valve 101 severable.

The invention is not limited to the illustrated embodiments of the 1 to 3 limited. For example, it is possible to provide a larger variety of buildings or Erdkollektormodulen. It is also possible to connect pumps to the Erdkollektormodulen that promote the heat exchange medium by pressure in the Erdkollektormodule, the pumps are connected to the return, as shown in 1 is shown schematically by dashed pump symbols. Also pumps can be connected to the flow and additional pumps with the return. This is particularly advantageous for a large variety of Erdkollektormodulen. It is also possible to combine Erdkollektormodule with geothermal probes.

101

barrier

102

emptying, vent

103

check valve

104

strainer

105

Heat meters

106

Kappenventil

107

expansion tank

108

safety valve

109

Heating / -Kühlkreis inside the building

110

regulation

111

3-way valve with motor drive

112

Differential pressure regulator

113

Volume flow controller

114

manometer

200 ₁ to 200 ₉ , 300 ₁ to 300 ₉

Erdkollektormodul, vertical ground collector

211 ₁ to 211 ₉ , 212 ₁ to 212 ₉

connection

310 320

Field, agricultural land

311 313, 321, 323

distributor

312 314, 322, 324, 353, 354, 363, 364, 373, 374

Valve

315 325

pump

330

Leader, pipe

340

Rewind, pipe

350 360, 370

Building, residential building

355, 356, 365, 366, 375, 376

diversion, Tee

352 362, 372

Energy transfer point

351, 361, 371

heat pump

400 ₁ to 400 ₄ , 500 ₁ to 500 ₄

Erdsonde

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• AT 413302 B [0003]
• - DE 3114262 A1 [0005]
• AT 379892 [0005]
• - AT 369887 [0005]
• - DE 3913429 A1 [0005]
• AT 406521 B [0007]
• DE 10200106 A1 [0007]
• US 4106555 [0008]
• - DE 2913333 C2 [0008]
• AT 378260 [0009]
• - EP 1655566 A2 [0010]
• - DE 69722204 T2 [0011]
• DE 2930484 [0011]
• - DE 4443204 C2 [0011]

Claims (11)

Method of constructing a system for utilizing geothermal heat for a plurality of buildings ( 350 . 360 . 370 ), - in which a number of geothermal devices ( 200 ₁ to 200 ₉ . 300 ₁ to 300 ₉ . 400 ₁ to 400 ₄ . 500 ₁ to 500 ₄ ) is built in the ground for the removal of heat energy from the ground, the number of geothermal devices ( 200 ₁ to 200 ₉ . 300 ₁ to 300 ₉ . 400 ₁ to 400 ₄ . 500 ₁ to 500 ₄ ) of the majority of buildings to be heated ( 350 . 360 . 370 ) of the system, - in which the geothermal devices ( 200 ₁ to 200 ₉ . 300 ₁ to 300 ₉ . 400 ₁ to 400 ₄ . 500 ₁ to 500 ₄ ) with a flow ( 330 ) and a return ( 340 ), - in which each energy transfer point ( 352 . 362 . 372 ) of each building ( 350 . 360 . 370 ) with the flow ( 330 ) and with the return ( 340 ) is connected to a closed circuit, - in which each energy transfer point ( 352 . 362 . 372 ) with a respective building ( 350 . 360 . 370 ) associated heat pump ( 351 . 361 . 371 ), in which a heat exchange medium is introduced into the closed circuit. Method according to claim 1, wherein a number of slots are milled into the ground for erection and each geothermal device ( 200 ₁ to 200 ₉ . 300 ₁ to 300 ₉ ) is positioned in a slot (the number). Method according to one of the preceding claims, in which each geothermal device is used as a dimensionally stable module ( 200 ₁ to 200 ₉ . 300 ₁ to 300 ₉ ) is formed with a arranged on a flat support continuous pipe system. System for using geothermal energy for a plurality of buildings ( 350 . 360 . 370 ), - with a number of underground geothermal devices ( 200 ₁ to 200 ₉ . 300 ₁ to 300 ₉ . 400 ₁ to 400 ₄ . 500 ₁ to 500 ₄ ) for the removal of heat energy from the soil, the number of geothermal devices ( 200 ₁ to 200 ₉ . 300 ₁ to 300 ₉ . 400 ₁ to 400 ₄ . 500 ₁ to 500 ₄ ) of the majority of buildings to be heated ( 350 . 360 . 370 ) of the system, - with one with the geothermal devices ( 200 ₁ to 200 ₉ . 300 ₁ to 300 ₉ . 400 ₁ to 400 ₄ . 500 ₁ to 500 ₄ ) associated flow ( 330 ), - one with the geothermal devices ( 200 ₁ to 200 ₉ . 300 ₁ to 300 ₉ . 400 ₁ to 400 ₄ . 500 ₁ to 500 ₄ ) associated return ( 340 ), - each with an energy transfer point ( 352 . 362 . 372 ) for each building ( 350 . 360 . 370 ), wherein the energy transfer point ( 352 . 362 . 372 ) with the flow ( 330 ) and with the return ( 340 ) is connected to a closed circuit, - each with at least one heat pump ( 351 . 361 . 371 ) for each building ( 350 . 360 . 370 ), whereby the heat pump ( 351 . 361 . 371 ) with the energy transfer point ( 352 . 362 . 372 ), and with a heat exchange medium in the closed circuit. System according to claim 4, wherein the heat exchange medium in the flow ( 330 ), Return ( 340 ) and in the geothermal devices ( 200 ₁ to 200 ₉ . 300 ₁ to 300 ₉ . 400 ₁ to 400 ₄ . 500 ₁ to 500 ₄ ) has a temperature which is less than or equal to a temperature of the soil. System according to one of the preceding claims, with at least one pump ( 315 . 316 ), which with the flow ( 330 ) and / or the return ( 340 ) is connected to pump the heat exchange medium in a closed circuit. System according to one of the preceding claims, with a volumetric flow controller ( 113 ), with the respective heat pump ( 351 . 361 . 371 ) and the forerun ( 330 ) and / or the return ( 340 ) connected is. System according to one of the preceding claims, with a differential pressure regulator ( 112 ), with the respective heat pump ( 351 . 361 . 371 ) and the forerun ( 330 ) and / or the return ( 340 ) connected is. System according to one of the preceding claims, in which geothermal devices are used as vertical geothermal collectors ( 200 ₁ to 200 ₉ . 300 ₁ to 300 ₉ ) are formed. System according to one of the preceding claims, in which geothermal devices are used as geothermal probes ( 400 ₁ to 400 ₄ . 500 ₁ to 500 ₄ ) are formed in deep holes. Use of a number of underground geothermal devices ( 200 ₁ to 200 ₉ . 300 ₁ to 300 ₉ . 400 ₁ to 400 ₄ . 500 ₁ to 500 ₄ ) for the temperature control of several buildings ( 350 . 360 . 370 ) by means of heat pumps ( 351 . 361 . 371 ), in which the respective heat pump ( 351 . 361 . 371 ) of each building ( 350 . 360 . 370 ) with a flow ( 330 ) and with a return ( 340 ) and with the geothermal devices ( 200 ₁ to 200 ₉ . 300 ₁ to 300 ₉ . 400 ₁ to 400 ₄ . 500 ₁ to 500 ₄ ) is connected in a closed circuit, and in which the number of geothermal devices ( 200 ₁ to 200 ₉ . 300 ₁ to 300 ₉ . 400 ₁ to 400 ₄ . 500 ₁ to 500 ₄ ) to the required amount of energy of all buildings ( 350 . 360 . 370 ) is tuned.