WO2009074287A1 - Geothermal probe made of cross-linked polymer material - Google Patents

Geothermal probe made of cross-linked polymer material Download PDF

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Publication number
WO2009074287A1
WO2009074287A1 PCT/EP2008/010434 EP2008010434W WO2009074287A1 WO 2009074287 A1 WO2009074287 A1 WO 2009074287A1 EP 2008010434 W EP2008010434 W EP 2008010434W WO 2009074287 A1 WO2009074287 A1 WO 2009074287A1
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WIPO (PCT)
Prior art keywords
tube
layers
geothermal probe
geothermal
probe according
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PCT/EP2008/010434
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German (de)
French (fr)
Inventor
Volker Liebel
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Rehau Ag + Co
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Application filed by Rehau Ag + Co filed Critical Rehau Ag + Co
Priority to EP08858664A priority Critical patent/EP2217868A1/en
Publication of WO2009074287A1 publication Critical patent/WO2009074287A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
    • F28F21/062—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material the heat-exchange apparatus employing tubular conduits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5223—Joining tubular articles for forming corner connections or elbows, e.g. for making V-shaped pieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7375—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured
    • B29C66/73753—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being partially cured, i.e. partially cross-linked, partially vulcanized
    • B29C66/73754—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being partially cured, i.e. partially cross-linked, partially vulcanized the to-be-joined areas of both parts to be joined being partially cured
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
    • F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
    • F24T10/15—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using bent tubes; using tubes assembled with connectors or with return headers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
    • F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
    • F24T10/17—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using tubes closed at one end, i.e. return-type tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0691—PEX, i.e. crosslinked polyethylene
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Thermal Insulation (AREA)

Abstract

Disclosed is a geothermal probe (1) comprising at least two polymer tubes (2.1, 2.2) that run parallel in at least some sections and a monolithic or multipart molded piece (3) which is made of similar material and is located at an end of at least one tube. According to the invention, said geothermal probe (1) is characterized in that at least the tube that is in contact with the ground is welded and cross-linked to the molded piece.

Description

Erdwärmesonde aus vernetzten! Polymermaterial Networked geothermal probe! polymer material
Die Erfindung betrifft eine Erdwärmesonde aus einem vernetzten Polymermaterial und eine Vorrichtung zur Erdwärmegewinnung mit einer derartigen Erdwärmesonde, sowie eine Vorrichtung zur Erdwärmespeicherung mit einer derartigen Erdwärmesonde.The invention relates to a geothermal probe made of a crosslinked polymer material and a device for geothermal energy production with such a geothermal probe, and a device for geothermal energy storage with such a geothermal probe.
Bekannt sind Erdwärmesonden aus unvernetztem Polyethylen, z.B. aus PE100, PE-RT oder PE-RC, und aus vernetztem Polyethylen (PE-Xa).Geothermal probes made of uncrosslinked polyethylene, e.g. made of PE100, PE-RT or PE-RC, and of cross-linked polyethylene (PE-Xa).
Erdwärmesonden aus PE100 können nur bis zu Temperaturen von etwa 40 0C betrieben werden und sind nur eingeschränkt spannungsrißbeständig und damit als Druckrohr nicht punktlastbeständig, d. h. diese sind zwingend in einem Sandbett zu verlegen.Geothermal probes made of PE100 can be operated only up to temperatures of about 40 0 C and are only limited stress cracking and thus not pressure resistant puncture resistant, ie they are mandatory to lay in a sand bed.
Erdwärmesonden aus PE-RT können zwar bis zu Temperaturen von etwa 80 CC betrieben werden, sind jedoch nur eingeschränkt spannungsrißbeständig und damit als Druckrohr ebenfalls nicht punktlastbeständig.While geothermal probes made of PE-RT can be operated at temperatures up to about 80 C C, but are limited stress cracking and thus as a pressure tube also not point load resistance.
Erdwärmesonden aus PE-RC können nur bis zu Temperaturen von etwa 40 "C betrieben werden.Geothermal probes made of PE-RC can only be operated up to temperatures of about 40 "C.
Erdwärmesonden aus PE-Xa können zwar bis zu Temperaturen von etwa 95 0C betrieben werden und sind uneingeschränkt spannungsrißbeständig und damit als Druckrohr punktlastbeständig, können jedoch nicht mit einem polymeren Sondenfuß verschweißt werden.Geothermal probes made of PE-Xa can indeed be operated up to temperatures of about 95 0 C and are fully stress cracking resistant and thus puncture resistant as a pressure tube, but can not be welded with a polymeric probe foot.
Aufgabe der vorliegenden Erfindung ist es daher, eine Erdwärmesonde zur Verfügung zu stellen, die die Nachteile des bekannten Standes der Technik überwindet und es insbesondere gestattet, ein Formteil als Sondenfuß an ein Rohr anzuschweißen, wobei die Vernetzung des Polymermaterials die hervorragenden mechanischen und thermischen Eigenschaften sicherstellen soll. Zur Lösung der Aufgabe zur Überwindung der Nachteile des Standes der Technik werden Erdwärmesonden vorgeschlagen, die aus mindestens zwei annähernd parallel zueinander verlaufenden polymeren Rohren bestehen, welche an einem Ende mit einem angeschweißten Formteil versehen sind, wobei mindestens ein Rohr und das Formteil vernetzt sind.The object of the present invention is therefore to provide a geothermal probe which overcomes the disadvantages of the known prior art and in particular allows a molded part to be welded to a tube as a probe foot, the crosslinking of the polymer material ensuring the outstanding mechanical and thermal properties should. To solve the problem of overcoming the disadvantages of the prior art geothermal probes are proposed which consist of at least two approximately mutually parallel extending polymeric tubes which are provided at one end with a welded molded part, wherein at least one tube and the molded part are crosslinked.
Solche Rohre lassen sich beispielsweise dadurch herstellen, dass mit Silanen vernetzbares Polymermaterial, insbesondere Polyethylen, zu Rohren und Formteilen geformt wird. Diese vernetzen nach der Herstellung langsam, vor dem Erreichen eines kritischen Vernetzungsgrades werden sie miteinander verschweißt. Der kritische Vernetzungsgrad liegt im Bereich von max. 35 %.Such tubes can be produced, for example, by forming silane-crosslinkable polymer material, in particular polyethylene, into tubes and molded parts. They crosslink slowly after production and are welded together before reaching a critical degree of crosslinking. The critical degree of crosslinking is in the range of max. 35%.
Die nach dem Verschweißen von Rohren und Soηdenfuß noch vorzunehmende Vernetzung kann mittels erhöhter Temperatur unter Wasserdampfeinfluss durchgeführt bzw. beschleunigt werden. Das resultierende sogenannte silan-vernetzte Polyethylen (PE-Xb) ist besonders wider- standsfähig und daher bevorzugt geeignet zur Herstellung von Erdwärmesonden.The still to be carried out after the welding of pipes and Soηdenfuß networking can be carried out or accelerated by means of elevated temperature under the influence of water vapor. The resulting so-called silane-crosslinked polyethylene (PE-Xb) is particularly resistant and therefore preferably suitable for the production of geothermal probes.
Weiterhin lassen sich die erfindungsgemäßen Erdwärmesonden dadurch herstellen, dass zunächst Erdwärmesonden aus unvernetzten Polyethylenrohren und -formteilen mittels Schweißverfahren miteinander verbunden werden, und diese Baugruppe dann mittels Be- Strahlung vernetzt wird.Furthermore, geothermal probes according to the invention can be prepared by first geothermal probes are made of uncrosslinked polyethylene pipes and fittings with each other by means of welding, and this assembly is then crosslinked by radiation.
Hierzu eignet sich in erster Linie das Elektronenstrahlvernetzen.This is primarily the electron beam crosslinking.
Es sind aber auch andere Strahlungsvemetzungstechniken einsetzbar.However, other radiation crosslinking techniques can also be used.
Das strahlenvernetzte Polyethylen (PE-Xc) ist besonders gut geeignet für die Herstellung von Erdwärmesonden.The radiation cross-linked polyethylene (PE-Xc) is particularly well suited for the production of geothermal probes.
Als Schweißverfahren kommen grundsätzlich alle bekannten Schweißverfahren in Frage, wobei die Stumpfschweißung den Vorteil aufweist, sehr kostengünstig und prozesssicher zu sein und dabei den Außendurchmesser der Sonde am wenigsten vergrößert.In principle, all known welding methods can be used as the welding method, but the butt welding has the advantage of being very cost-effective and reliable while at the same time making the outer diameter of the probe the least large.
Erfindungsgemäß sind zwei Bauformen für derartige Erdwärmesonden möglich:According to the invention, two types of such geothermal probes are possible:
1. es werden zwei annähernd parallel verlaufende Rohre vorgesehen, wobei die Rohre zumindest abschnittsweise nebeneinander verlaufend positioniert sind. Bei dieser Ausführung der Erdwärmesonde sind beide Rohre und das Formteil erd- berührt. Eine derartige Erdwärmesonde weist einen einfachen Aufbau auf und ist insbesondere ohne großen Aufwand herstellbar.1. there are provided two approximately parallel tubes, wherein the tubes are at least partially positioned side by side running. In this version of the geothermal probe, both tubes and the molded part are grounded. Such a geothermal probe has a simple structure and in particular can be produced without much effort.
2. es werden zwei annähernd parallel verlaufende Rohre vorgesehen, wobei ein erstes2. there are provided two approximately parallel tubes, wherein a first
Rohr mit einem Lumen, dessen Durchmesser größer ist, als der Durchmesser eines zweiten Rohres, vorgesehen ist, und das zweite Rohr im Lumen des ersten Rohres positioniert ist.Tube with a lumen whose diameter is greater than the diameter of a second tube, is provided, and the second tube is positioned in the lumen of the first tube.
Bei dieser Ausführung der Erdwärmesonde sind das Formteil und das erste Rohr erdberührt.In this embodiment, the geothermal probe, the molded part and the first tube are grounded.
Eine derartige Erdwärmesonde weist eine höhere Wärmeübertragungsleistung auf, ist jedoch bei der Herstellung und beim Einbau aufwendiger.Such a geothermal probe has a higher heat transfer performance, but is more expensive in the production and installation.
Die Erfindung bezieht sich auch auf eine Ausführung, bei der das Rohr und/oder das Formteil schichtförmige Wandungen, insbesondere mit Innen-, Außen- oder Zwischenschichten, aufweist.The invention also relates to an embodiment in which the tube and / or the molded part has layer-shaped walls, in particular with inner, outer or intermediate layers.
Diese Schichten können Haftvermittlerschichten, Abriebschutzschichten, Wärmeleitschichten, Wärmeisolationsschichten, Diffusionssperrschichten, Markierungsschichten, Gleit- schichten, Inspektionsschichten, Leckagedetektionsschichten und andere umfassen.These layers can include primer layers, scuff layers, heat conducting layers, heat insulating layers, diffusion barrier layers, marking layers, slip layers, inspection layers, leakage detection layers, and others.
Hiermit ergeben sich vorteilhafte Eigenschaften bei der Herstellung, beim Einbau und bei der Verwendung der Erdwärmesonde gemäß vorliegender Erfindung.This results in advantageous properties in the production, installation and use of the geothermal probe according to the present invention.
In einer besonders bevorzugten Ausführungsform der Erfindung kann das Rohr, welches nicht erdberührt ist, wenigstens teilweise geschäumt sein.In a particularly preferred embodiment of the invention, the tube, which is not earthed, may be at least partially foamed.
Dies hat den Vorteil, dass bei der Bauform 2 - wie oben dargestellt - das „innere" Rohr wärmegedämmt ist und somit Wärmeverluste vom bereits erwärmten Rücklauf auf den noch kalten Vorlauf reduziert werden.This has the advantage that in the design 2 - as shown above - the "inner" tube is thermally insulated and thus heat losses from the already heated return to the still cold flow can be reduced.
Es ist in einer anderen Ausführung der Erfindung auch möglich, dass das Rohr, welches nicht erdberührt ist, vernetzt ist.It is also possible in another embodiment of the invention that the tube, which is not earthed, is crosslinked.
Dies hat den Vorteil, dass das innere Rohr besonders widerstandsfähig gegen Temperatureinflüsse und mechanische Beanspruchungen ist. Die Erfindung soll anhand der beigefügten illustrierenden Fig. detailliert erläutert werden:This has the advantage that the inner tube is particularly resistant to temperature influences and mechanical stresses. The invention will be explained in detail with reference to the attached illustrative FIG.
Fig. 1 zeigt einen Querschnitt durch eine Erdwärmesonde mit zwei annähernd parallel angeordneten Rohren, die durch ein Formteil an einem Ende verbunden sind;Fig. 1 shows a cross section through a geothermal probe with two approximately parallel tubes, which are connected by a molding at one end;
Fig. 2 zeigt einen Querschnitt durch eine Erdwärmesonde mit zwei annähernd parallel angeordneten Rohren, wobei ein inneres Rohr in das äußere Rohr positioniert ist, mit einem Formteil, das das äußere Rohr an einem Ende verschließt.Fig. 2 shows a cross section through a geothermal probe with two tubes arranged approximately parallel, with an inner tube positioned in the outer tube, with a molding closing the outer tube at one end.
Im Einzelnen zeigen die Fig. folgendes:In detail, the figures show the following:
In Fig. 1 ist eine Erdwärmesonde (1) dargestellt, die aus zwei parallel zu einander verlau- fenden Rohren (2.1 , 2.2) besteht, an deren unterem Ende ein aus zwei Einzelteilen (3.1 , 3.2) gefügtes Formteil angeschweißt ist. Die Rohre und die Formteile bestehen dabei aus silanvernetztem Polyethylen (PE-Xb). Die beiden Rohre (2.1 , 2.2) können dabei wahlweise je als Vor- und Rücklauf einer Erdwärmegewinnungsvorrichtung verwendet werden.In Fig. 1, a geothermal probe (1) is shown, which consists of two parallel to each other duri fenden pipes (2.1, 2.2), at the lower end of a two parts (3.1, 3.2) joined molded part is welded. The tubes and the molded parts consist of silane-crosslinked polyethylene (PE-Xb). The two tubes (2.1, 2.2) can optionally be used as each forward and return a geothermal heat recovery device.
In Fig. 2 ist eine Erdwärmesonde (1) dargestellt, die ebenfalls aus zwei parallel zu einander verlaufenden Rohren (2.1 , 2.2) besteht, wobei das Rohr (2.2) im Inneren des Rohrs (2.1) angeordnet ist. Am unteren Ende des äußeren Rohrs (2.1) ist ein Formteil (3) angeschweißt. Das Rohr (2.1) und das Formteil (3) bestehen dabei aus strahlenvernetztem Polyethylen (PE-Xc). Wahlweise kann auch das Rohr (2.2) aus vernetztem Polyethylen bestehen. Für die optimale Wärmeübertragung ist es vorteilhaft, das Rohr (2.2) als Vorlauf und das Rohr (2.1) als Rücklauf einer Erdwärmegewinnungsvorrichtung zu verwenden. Bei einer Erdwärmespeichervorrichtung kann beim Wärmeeintrag vorteilhaft das Rohr 2.1 als Vorlauf bzw. bei der Wärmeentnahme das Rohr 2.2 als Vorlauf eingesetzt werden.In Fig. 2, a geothermal probe (1) is shown, which also consists of two parallel to each other extending tubes (2.1, 2.2), wherein the tube (2.2) in the interior of the tube (2.1) is arranged. At the lower end of the outer tube (2.1) a molded part (3) is welded. The tube (2.1) and the molded part (3) consist of radiation-crosslinked polyethylene (PE-Xc). Optionally, also the tube (2.2) consist of cross-linked polyethylene. For optimal heat transfer, it is advantageous to use the pipe (2.2) as a feed and the pipe (2.1) as the return of a geothermal heat recovery device. In a geothermal heat storage device, the tube can be used as a flow or in the heat removal, the pipe 2.2 as a flow during the heat input advantageous.
Eine Ausführung, bei der das innere Rohr eine Wärmedämmschicht in Form einer Schaumschicht aufweist ist dabei besonders vorteilhaft und damit bevorzugt. Die Erdwärmegewinnungsvorrichtung gemäß vorliegender Erfindung zeichnet sich dadurch aus, dass sie mindestens eine Erdwärmesonde entsprechend der vorgenannten Offenbarung aufweist.An embodiment in which the inner tube has a thermal barrier coating in the form of a foam layer is particularly advantageous and therefore preferred. The geothermal heat generating device according to the present invention is characterized in that it comprises at least one geothermal probe according to the aforementioned disclosure.
Die Erdwärmespeichervorrichtung gemäß vorliegender Erfindung zeichnet sich dadurch aus, dass sie mindestens eine Erdwärmesonde entsprechend der vorgenannten Offenbarung aufweist.The geothermal storage device according to the present invention is characterized in that it comprises at least one geothermal probe according to the aforementioned disclosure.
Bei der Erdwärmespeichervorrichtung gemäß vorliegender Erfindung wird mittels der erfindungsgemäßen Erdwärmesonde Wärmeenergie in die Umgebung der eingebauten Sonde eingebracht, um diese dort örtlich und zeitlich begrenzt zu speichern.In the geothermal heat storage device according to the present invention, heat energy is introduced into the environment of the built-in probe by means of the geothermal probe according to the invention in order to store it there locally and for a limited time.
- Schutzansprüche - Protection claims

Claims

Schutzansprüche protection claims
1. Erdwärmesonde (1), bestehend aus wenigstens zwei wenigstens abschnittsweise parallel verlaufenden polymeren Rohren (2.1 , 2.2) sowie einem aus gleichartigem Ma- terial hergestellten ein- oder mehrteiligem Formteil (3) an einem Ende mindestens eines Rohres, dadurch gekennzeichnet, dass zumindest das erdberührte Rohr mit dem Formteil verschweißt und vernetzt ist.1. geothermal probe (1), consisting of at least two at least partially parallel running polymeric tubes (2.1, 2.2) and a material produced from similar ma- material one or more parts molded part (3) at one end of at least one tube, characterized in that at least the earthing-contact pipe is welded to the molded part and crosslinked.
2. Erdwärmesonde nach Anspruch 1 , dadurch gekennzeichnet, dass das Rohr und das Formteil aus vernetzten! Polyethylen bestehen.2. geothermal probe according to claim 1, characterized in that the tube and the molded part of networked! Polyethylene exist.
3. Erdwärmesonde nach Anspruch 2, dadurch gekennzeichnet, dass das Rohr und das Formteil aus silanvernetztem Polyethylen (PE-Xb) bestehen.3. geothermal probe according to claim 2, characterized in that the tube and the molded part of silanvernetztem polyethylene (PE-Xb) exist.
4. Erdwärmesonde nach Anspruch 2, dadurch gekennzeichnet, dass das Rohr und das Formteil aus strahlenvernetztem Polyethylen (PE-Xc) bestehen.4. geothermal probe according to claim 2, characterized in that the tube and the molded part made of radiation cross-linked polyethylene (PE-Xc) exist.
5. Erdwärmesonde nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, dass das Rohr und/oder das Formteil schichtförmige Wandungen, insbesondere mit Innen-, Außen- oder Zwischenschichten, aufweisen.5. Geothermal probe according to one of the preceding claims, characterized in that the tube and / or the molded part have layer-shaped walls, in particular with inner, outer or intermediate layers.
6. Erdwärmesonde nach Anspruch 5, dadurch gekennzeichnet, dass die Schichten Haftvermittlerschichten, Abriebschutzschichten, Wärmeleitschichten, Wärmeisolationsschichten, Diffusionssperrschichten, Markierungsschichten, Gleitschichten, Inspekti- onsschichten, Leckagedetektionsschichten und andere umfassen.6. geothermal probe according to claim 5, characterized in that the layers adhesion promoter layers, abrasion protection layers, heat conducting layers, heat insulating layers, diffusion barrier layers, marking layers, sliding layers, Inspekti- onsschichten, leakage detection layers and others.
7. Erdwärmesonde nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, dass das Rohr, welches nicht erdberührt ist, geschäumt ist. 7. geothermal probe according to one of the preceding claims, characterized in that the tube, which is not earth-touched, is foamed.
8. Erdwärmesonde nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, dass das Rohr, welches nicht erdberührt ist, vernetzt ist.8. Geothermal probe according to one of the preceding claims, characterized in that the tube, which is not earthed, is crosslinked.
9. Erdwärmegewinnungsvorrichtung mit einer Erdwärmesonde nach einem der Ansprüche 1 bis 8.9. geothermal heat extraction device with a geothermal probe according to one of claims 1 to 8.
10. Erdwärmespeichervorrichtung mit einer Erdwärmesonde nach einem der Ansprüche 1 bis 8. 10. Geothermal heat storage device with a geothermal probe according to one of claims 1 to 8.
PCT/EP2008/010434 2007-12-11 2008-12-09 Geothermal probe made of cross-linked polymer material WO2009074287A1 (en)

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DE202007017371U DE202007017371U1 (en) 2007-12-11 2007-12-11 Geothermal probe made of cross-linked polymer material
DE202007017371.7 2007-12-11

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