WO2022112643A1 - Collecteur géothermique coaxial doté de tuyau interne isolé - Google Patents

Collecteur géothermique coaxial doté de tuyau interne isolé Download PDF

Info

Publication number
WO2022112643A1
WO2022112643A1 PCT/FI2020/050805 FI2020050805W WO2022112643A1 WO 2022112643 A1 WO2022112643 A1 WO 2022112643A1 FI 2020050805 W FI2020050805 W FI 2020050805W WO 2022112643 A1 WO2022112643 A1 WO 2022112643A1
Authority
WO
WIPO (PCT)
Prior art keywords
inner pipe
sinker
open tubular
pipe element
wall
Prior art date
Application number
PCT/FI2020/050805
Other languages
English (en)
Inventor
Mika MANNER
Original Assignee
Senera Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Senera Oy filed Critical Senera Oy
Priority to PCT/FI2020/050805 priority Critical patent/WO2022112643A1/fr
Priority to EP20963398.1A priority patent/EP4251932A4/fr
Publication of WO2022112643A1 publication Critical patent/WO2022112643A1/fr

Links

Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T2010/50—Component parts, details or accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T2010/50—Component parts, details or accessories
    • F24T2010/53—Methods for installation
    • 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

Definitions

  • This specification relates to coaxial geothermal col lectors, or heat transfer piping arrangements, to be installed in a borehole, the collectors comprising an outer pipe and an inner pipe located within the outer pipe.
  • the specification is focused on col lectors and piping arrangements with thermally insulated inner pipe.
  • thermal insulation may be used between the inner flow channel formed within the inner pipe and the outer flow channel formed between the inner and the outer pipes.
  • the thermal insulation may be implemented, for example, by means of a layer of a thermally insulating material arranged on the surface of the inner pipe. Examples are disclosed e.g. in WO2019/155129.
  • Thermally insulating materials such as polyurethane typ ically have densities well below that of water. This may cause buoyance force tending to raise the inner pipe located in a borehole filled with water or other heat transfer liquid. The buoyance forces may affect ad versely not only the requirements set for the ready assembled system but also the installation of the coax ial collector into the ground heat well formed by the borehole.
  • an inner pipe element for an inner pipe for a coaxial geothermal heat transfer piping, such as a closed geothermal heat transfer pip ing, with an outer pipe and an inner pipe to be posi tioned in a borehole with the inner pipe within the outer pipe.
  • the inner pipe element has a lower end and comprises a wall and a thermal insulation layer thereon.
  • the thermal insulation layer has a density lower than that of the wall.
  • the inner pipe element comprises first mounting means at its lower end for mounting an open tubular sinker, having a density higher than that of the pipe inner element wall, to the inner pipe element at the lower end thereof.
  • an open tubular sinker starting mod ule for being mounted to an inner pipe element of the first aspect above.
  • the open tubular sinker starting module comprises second mounting means at its upper end for mounting the open tubular sinker module to the inner pipe element at the lower end thereof by connecting the second and the first mounting means.
  • an open tubular sinker for being mounted to an inner pipe element of the first aspect.
  • the open tubular sinker has a density higher than that of the pipe inner element wall, the open tubular sinker comprising an open tubular sinker starting module of the second aspect above.
  • an inner pipe for a coaxial geothermal heat transfer piping, such as a closed geothermal heat transfer piping, with an outer pipe and an inner pipe to be positioned in a borehole with the inner pipe within the outer pipe.
  • the inner pipe comprises an inner pipe element of the first aspect above and open tubular sinker as disclosed above mounted to the inner pipe element.
  • a coaxial geothermal heat transfer piping such as a closed geothermal heat transfer piping, is dis closed with an outer pipe and an inner pipe as disclosed above to be positioned in a borehole with the inner pipe within the outer pipe.
  • Figure 1 illustrates a coaxial geothermal heat transfer piping positioned in a borehole
  • Figures 2 and 3 illustrate variations of a coaxial ge othermal heat transfer piping; and Figure 4 illustrates an open tubular sinker for a coax ial geothermal heat transfer piping in accordance with any of Figures 1 to 3.
  • a closed coaxial geothermal heat transfer piping 100 also called a coaxial geothermal collector, is positioned in a borehole 101 formed in the bedrock.
  • the borehole 101 may form a geothermal well.
  • the heat transfer piping or geothermal collector 100 comprises an outer pipe 110. Although illustrated at a distance from the wall of the borehole, the outer pipe may in practice be in contact with the wall of the borehole.
  • An inner pipe 120 is positioned within the outer pipe. Thereby, an inner flow channel 102 is formed by the inner pipe and an outer flow channel 103 is formed between the inner pipe 120 and the outer pipe 110.
  • the inner and outer flow channels together form a coaxial flow channel where a heat transfer liquid may flow up wards or downwards via the inner flow channel and down wards or upwards, respectively, via the outer flow chan nel.
  • the piping or collector 100 being "closed” means that the entire coaxial flow channel 102, 103 is defined by the inner and outer pipe without any part of the channel being defined by the borehole. This is implemented by the outer pipe 10 being closed at its lower end.
  • the inner pipe 120 is, instead, open at its both ends to allow a heat transfer liquid, or generally a heat trans fer fluid, to flow through it.
  • an open coaxial geothermal heat transfer piping may be implemented where the outer pipe may be open at its lower end or may be missing entirely. In such embodiments, at least part of the coaxial flow channel may be defined by the borehole.
  • An open geo thermal collector may be used, for example, in applica tions utilizing the groundwater as the heat transfer fluid.
  • lower and upper refer in this spec ification to the upwards and downwards directions of a coaxial collector when assembled or in use in a normal way in a substantially vertical borehole.
  • the inner pipe 120 comprises an inner pipe element 130.
  • the inner pipe element has a wall 131 which is at least partially formed of, thus comprises, a plastic.
  • plastic may comprise, for example, polyethylene PE or some other plastic material suitable for a pipe for leading a heat transfer liquid through it.
  • materials other than a plastic may be used to form an inner pipe element wall.
  • the material of which the wall of an inner pipe element is at least partially formed is generally called a "pipe material" in this specification.
  • a “pipe” or “pipe element” refer in this specification to a hollow, elongated, thus tubular body having a wall defining and encircling an inner volume of the pipe or a pipe element.
  • the wall 131 of the inner pipe element 130 is a single-layer structure.
  • layered inner pipe element walls with several wall layers or sheaths may be implemented.
  • the wall layers may lie directly on each other or separated from each other. Different wall layers may be formed of the same pipe material or from different pipe materials.
  • the density of the inner pipe element wall(s) is defined by the pipe material(s).
  • PE may have a density of close to 1000 kg/m 3 , i.e. the density of water. Therefore, a plain inner pipe element pipe with a wall formed of PE could be subject to no or insignif icant buoyance forces when inserted within the outer pipe, or the borehole in the case of an open coaxial collector, filled with water or other heat transfer liq uid.
  • the inner pipe element 130 of Figure 1 has a thermal insulation layer 132 on its outer surface, at least partially formed of, thus comprising, a thermal insulation material.
  • the thermal insulation layer may improve the thermal insulation between the inner and outer flow channels of the coaxial flow channel and may thereby improve the heat collection efficiency.
  • the thermal insulation material may comprise, for exam ple, polyurethane PU.
  • Polyurethane may provide high thermal insulation capacity and it is also a convenient choice from the manufacturing point of view.
  • Another example of possible thermal insulation material is pol- yisocyanurate PIR.
  • the thermal insulation layer is a single-layer structure.
  • a thermal insulation layer may comprise several sub-layers which may be formed of the same or different mate rial (s).
  • Thermal insulation materials may have densities sub stantially lower than pipe materials.
  • PU for example, typically has a density of some tens of kg/m 3 only.
  • the den sity of such member may refer to the average density thereof.
  • the lower density of the thermal insulation material in comparison to the pipe material causes the thermal in sulation layer 132 having a density lower than that of the inner pipe element wall 131. This may make the (av erage) density of the entire inner pipe element sub stantially lower than the density of a corresponding inner pipe element with a plain wall only without any thermal insulation layer thereon. This, in turn, may cause the inner pipe element subject to significant buoyancy forces when inserted within the outer pipe, or within the borehole in the case of an open coaxial col lector, filled with water or a heat transfer liquid.
  • the inner pipe 120 of Figure 1 further comprises an open tubular sinker 140 mounted to the lower end 133 of the inner pipe element 130.
  • the open tubular sinker is at least partially formed of, thus comprises, a metal.
  • metal may comprise, for example, steel.
  • the material of which an open tubular sinker is at least partially formed may be called a sinker material.
  • a sinker material In other embodiments, it may be possible to use other sinker materials than a metal.
  • the sinker material is selected so that the sinker has a density which is higher than the density of the inner pipe element wall. Thereby, the density of the entire inner pipe may be made higher than that of the inner pipe element with the thermal insulation layer thereon. Then, the effect of buoyancy forces applied to the inner pipe element may be at least partially compensated.
  • the inner pipe element 130 For mounting the open tubular sinker 140 to the inner pipe element 130, the inner pipe element 130 comprises first mounting means in the form of a first thread 134 at the lower end 133 thereof.
  • the first thread is formed on the outer surface of the inner pipe element wall 131.
  • a Corresponding mating second thread 141 is formed on the inner surface of the open tubular sinker at the upper end 142 thereof to serve as second mounting means.
  • the open tubular sinker 140 is mounted to the inner pipe element 140 by screwing, thereby connecting the first and the second threads.
  • a first thread may be implemented in any appropriate manner on any appropriate surface and extend along any appropriate length of the wall of an inner pipe element.
  • a first thread may be formed on an inner or outer surface of the wall of an inner pipe element, and corresponding second thread may be formed an outer or inner surface, respectively, of an open tubular sinker.
  • an inner pipe element may comprise an end part with a conical outer or inner surface, whereby a first thread may be formed on the conical outer or inner surface. Then, the upper end of an open tubular sinker may be formed correspondingly to have an appropriately shaped inner or outer surface at its upper end where a second thread is formed.
  • An example of an end part described above is illustrated in Figure 2.
  • a first thread may be formed on an inner or outer surface of either of the sheaths.
  • the inner pipe element may com prise an end part mounted to the both sheaths, a first thread being formed on the end section.
  • Figure 2 An example is illustrated in Figure 2.
  • mounting means different from any threads may be implemented for mounting a sinker to an inner pipe element.
  • Such mounting means may comprise any appropriate types of first and possible second mounting means connectable to each other for effecting the mounting.
  • the thermal insulation layer 132 has sections with different densities.
  • the lowermost part 132a of the thermal insulation layer has a density which is higher than the density of an upper part 132b thereof.
  • the density of the thermal insulation layer thereby increases, and thus the thermal insulation ca pacity decreases, towards the lower end 133 of the inner pipe element.
  • the varying thermal insulation capacity decreasing to wards the lower end of the inner pipe element, thus increasing towards the upper end thereof, may advanta geously provide highest thermal insulation capacity at the upper parts of the coaxial heat transfer piping where the temperature difference between the inner flow channel and the outer flow channels is highest.
  • the density increasing towards the lower end may advantageously improve the mechanical or compressive strength of the thermal insulation layer at the lower parts of the inner pipe element lying deep in the bore hole where the hydrostatic pressure is highest.
  • the parts with different densities of the thermal insulation layer means that the density of the thermal insulation layer increases step wise towards the lower end 133 of the inner pipe element 130.
  • inner pipe elements may be implemented with a thermal insulation layer with a continuously changing or constant density and thus continuously changing or constant thermal insulation capacity, re spectively.
  • the coaxial geothermal heat transfer piping or collector 200 of Figure 1 differs from those discussed above with reference to Figure 1 in that the inner pipe element 230 has a double wall with an inner sheath 231a and an outer sheath 231b enclosing the thermal insulation layer 232 therebetween.
  • the inner and the outer sheath may be formed of the same material or of different materials, such as any of the pipe materials discussed above.
  • the thermal insulation layer 232 being enclosed by an inner and outer sheath 231a, 231b may improve the me chanical durability of the thermal insulation layer. Further, it may prevent the thermal insulation layer from absorbing the heat transfer liquid, which might affect adversely its thermal insulation capacity.
  • the thermal insulation layer 232 of the inner pipe el ement of Figure 2 is similar to that of the inner pipe element of Figure 1.
  • a double wall inner pipe element similar to that of Figure 2 may comprise a thermal insulation layer with a continuously changing or constant density and thus continuously changing or constant thermal insulation capacity, re spectively.
  • the open tubular sinker 240 has at its upper end 242 a corresponding conical inner surface section and a mating second thread 241 thereon to serve as second mounting means.
  • the open tubular sinker 240 is mounted to the inner pipe element 230 by screwing, thereby connecting the first and the second thread.
  • the end part may be formed of any suitable material, such as any of the pipe materials discussed above.
  • each of the inner and outer sheaths of the inner pipe wall and the end part is at least par tially formed of PE, such as cross-linked PE.
  • the end part 235 may be mounted to the ends of the inner and outer sheaths, for example, by butt welding or ul trasonic welding.
  • an end part of an inner pipe element may have a conical inner surface widening downwards, a first thread being formed on the conical inner surface.
  • an open tubular sinker may have at its upper end a conical outer surface section widening downwards and thus tapering upwards, a second thread being formed on the outer surface section.
  • An end section connecting the two sheaths of an inner pipe element wall may improve the strength of the inner pipe element lower end as the weight of the sinker is divided between the two sheaths. Further, the conical thread arrangement may be advantageous in providing a secure and strong connection between the inner pipe el ement and the open tubular sinker.
  • the coaxial geothermal heat transfer piping or collector 300 of Figure 3 differs from those discussed above with reference to Figure 2 in that the thermal insulation layer 332 has a thickness which continuously reduces towards the lower end 333 of the inner pipe element 330.
  • the density of the thermal insulation layer may be con stant.
  • the changing thickness may provide a thermal in sulation capacity increasing towards the upper end of the inner pipe element 330.
  • the thickness of the thermal in sulation layer may reduce stepwise towards the lower end of the inner pipe element.
  • single-wall inner pipe elements may be implemented with a thermal insulation layer having a variable thickness decreasing stepwise or continuously towards the lower end of the inner pipe element.
  • inner pipe elements may be implemented with any combination of features spe cifically illustrated in and/or discussed above with reference to Figures 1 to 3.
  • a thermal insulation layer may have a step wise changing density, a gradually or constantly chang ing density, or a constant density, and constant or changing thickness. The same applies to the case of a double-wall inner pipe element.
  • the open tubular sinker may be in accordance with any of the embodiments discussed above or below.
  • the open tubular sinker 140 has a modular structure comprising several modules. First, it comprises an open tubular sinker starting mod ule 150 forming the most upper part of the sinker. The second thread 141 as the second mounting means is formed on the surface of the tubular sinker starting module at its upper end. Also the open tubular sinker 240 of Figure 2 comprises an open tubular sinker starting module 250.
  • a plurality of open tubular sinker continuation modules 151 are mounted, one after another, to the open tubular sinker starting module.
  • the open tubular sinker starting module and the open tubular sinker continuation modules have module mounting threads at the ends thereof for implementing the mounting there between. In other embodiments, any other appropriate module mounting means may be used.
  • the modular structure may facilitate the assembly of the inner pipe and insertion thereof into the second pipe.
  • the open tubular sinker may need to be even some tens of meters long to provide sufficient weight to compensate the buoyancy forces. That long single-piece sinker might be challenging to manufacture, transport, and handle.
  • a modular sinker may be assembled by mounting modules to each other as the sinker is being inserted into the second pipe. Each module may have a length, for example, of 3 to 5 meters.
  • any of the modules of the open tubular sinker may be formed of a metal such as steel as the sinker material.
  • single-module open tubular sinkers may be implemented having one module only, namely, an open tubular sinker starting module.
  • Figure 4 illustrates an alternative type of an open tubular sinker lower end, which may be used in other embodiments which may be in other respects in accordance with any of the embodiments discussed above.
  • the open tubular sinker 440 of Figure 4 has at its lower end 443 a conical end section 444, wherein the sinker tapers towards the lower end thereof.
  • the wall 445 of the sinker has openings 446 at the end section. Those openings make the lower end of the sinker “open", thus enabling flow of a heat transfer liquid out of or into the tubular, hollow sinker.
  • the conical end section 444 may be advantageous in an assembly technique where the outer pipe of a coaxial heat transfer piping where is first installed into a borehole in a folded assembly shape and opened thereaf ter into a use shape.
  • the conical end section of the open tubular sinker may facilitate opening of the outer pipe by inserting the inner pipe into the outer pipe. During the insertion, heated water or other liquid may be supplied into the outer pipe via the openings of the conical end section to further facilitate the opening of the outer pipe into its use shape.
  • a possible conical end section as well as a conical inner or outer surface section may be part of the tubular sinker start ing module.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Insulation (AREA)

Abstract

Élément (130) de tuyau interne destiné à un tuyau interne (120) d'une tuyauterie géothermique coaxiale (100) de transfert de chaleur, telle qu'une tuyauterie géothermique fermée de transfert de chaleur, dotée d'un tuyau externe (110) et d'un tuyau interne (120) devant être positionnés dans un trou de forage (101), le tuyau interne étant à l'intérieur du tuyau externe. L'élément du tuyau interne comporte une extrémité inférieure (133) et comprend une paroi (131) et une couche d'isolation thermique (132) sur ladite paroi, la couche d'isolation thermique présentant une densité inférieure à celle de la paroi. L'élément (130) du tuyau interne comprend des premiers moyens de montage (134) au niveau de son extrémité inférieure (133), permettant de monter un poids de lestage tubulaire ouvert (140), présentant une densité supérieure à celle de la paroi (131) de l'élément interne du tuyau, sur l'élément (130) du tuyau interne au niveau de son extrémité inférieure (133).
PCT/FI2020/050805 2020-11-27 2020-11-27 Collecteur géothermique coaxial doté de tuyau interne isolé WO2022112643A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/FI2020/050805 WO2022112643A1 (fr) 2020-11-27 2020-11-27 Collecteur géothermique coaxial doté de tuyau interne isolé
EP20963398.1A EP4251932A4 (fr) 2020-11-27 2020-11-27 Collecteur géothermique coaxial doté de tuyau interne isolé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2020/050805 WO2022112643A1 (fr) 2020-11-27 2020-11-27 Collecteur géothermique coaxial doté de tuyau interne isolé

Publications (1)

Publication Number Publication Date
WO2022112643A1 true WO2022112643A1 (fr) 2022-06-02

Family

ID=81755366

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2020/050805 WO2022112643A1 (fr) 2020-11-27 2020-11-27 Collecteur géothermique coaxial doté de tuyau interne isolé

Country Status (2)

Country Link
EP (1) EP4251932A4 (fr)
WO (1) WO2022112643A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050211437A1 (en) * 2004-03-26 2005-09-29 Mcnair Edward F Geothermal pipe weight
JP2007139370A (ja) * 2005-11-22 2007-06-07 Mitsui Eng & Shipbuild Co Ltd 地中熱交換器
DE102009030153A1 (de) * 2009-06-19 2011-01-27 Terra Calidus Gmbh Sondenfuß
KR20110124035A (ko) * 2010-05-10 2011-11-16 김진상 지열 히트펌프의 지중 열교환기
KR101607488B1 (ko) * 2014-10-28 2016-03-31 한국생산기술연구원 센트럴라이저가 구비된 지중열교환기용 배관 연결장치
KR101636741B1 (ko) * 2015-06-30 2016-07-06 한국생산기술연구원 지열정 단열 파이프
KR101733027B1 (ko) * 2016-08-12 2017-05-16 주식회사 서영엔지니어링 와류 유도형 지중열교환기 장치

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI130172B (en) * 2018-02-12 2023-03-27 Fira Group Oy Geothermal heat exchanger, geothermal heating arrangement and method for storing heat energy in the ground
KR102105707B1 (ko) * 2018-03-16 2020-04-28 (주)한진디엔비 지중열 교환 장치 및 그 시공 방법
CN111912126A (zh) * 2020-09-04 2020-11-10 河北工程大学 一种用于中深地层钻孔内的同轴套管换热器

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050211437A1 (en) * 2004-03-26 2005-09-29 Mcnair Edward F Geothermal pipe weight
JP2007139370A (ja) * 2005-11-22 2007-06-07 Mitsui Eng & Shipbuild Co Ltd 地中熱交換器
DE102009030153A1 (de) * 2009-06-19 2011-01-27 Terra Calidus Gmbh Sondenfuß
KR20110124035A (ko) * 2010-05-10 2011-11-16 김진상 지열 히트펌프의 지중 열교환기
KR101607488B1 (ko) * 2014-10-28 2016-03-31 한국생산기술연구원 센트럴라이저가 구비된 지중열교환기용 배관 연결장치
KR101636741B1 (ko) * 2015-06-30 2016-07-06 한국생산기술연구원 지열정 단열 파이프
KR101733027B1 (ko) * 2016-08-12 2017-05-16 주식회사 서영엔지니어링 와류 유도형 지중열교환기 장치

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4251932A4 *

Also Published As

Publication number Publication date
EP4251932A1 (fr) 2023-10-04
EP4251932A4 (fr) 2024-08-07

Similar Documents

Publication Publication Date Title
JP5795406B2 (ja) 液化天然ガス輸送用パイプ
US20090000681A1 (en) Reinforced double-walled pipe and manufacturing method
EP2735780B1 (fr) Tuyau flexible comprenant une isolation thermique
US10001300B2 (en) Coaxial borehole heat exchanger and method of producing the same
CN204141151U (zh) 管道支撑及低温液体输送管道
US20110041934A1 (en) Delivery Pipline System
US9851157B2 (en) Method and apparatus for maintaining a minimum temperature in a fluid
BR112017017018B1 (pt) Estrutura de tubo dentro de tubo, método para fabricar uma estrutura de tubo dentro de tubo e instalação submarina
WO2022112643A1 (fr) Collecteur géothermique coaxial doté de tuyau interne isolé
CN111810750A (zh) 一种抗压波纹管
US20060245989A1 (en) Monolithic pipe structure particularly suited for riser and pipeline uses
EP2352946A1 (fr) Conduite sous-marine de jonction coudee comprenant une isolation thermique
WO2004025193A1 (fr) Dispositif permettant de reduire sensiblement la quantite de caloporteur dans des capteurs solaires a tubes sous vide
CN100441931C (zh) 两种不同热膨胀系数管材之间的密封连接结构及连接方法
CN217583514U (zh) 一种耐高温的热水输送用直埋保温管
CN111794690A (zh) 内外双层保温油管
CN214274928U (zh) 一种地热井保温管
CN218060271U (zh) 一种非等径双螺旋形钢纤维混凝土能量桩
CN217328857U (zh) 一种新型高效气凝胶保温管道
CN220434667U (zh) 真空绝热油管
CN212376603U (zh) 内外双层保温油管
CN215864770U (zh) 一种中深层套管式地热换热器
KR200283336Y1 (ko) 태양열 집열판의 진공관 내에 형성되는 집열 파이프 구조
CN111043451A (zh) 地热开采用隔热保温管及其制造方法
AU2014274507B2 (en) Flexible pipe including thermal insulation

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20963398

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2020963398

Country of ref document: EP

Effective date: 20230627