WO2015016143A1 - Large capacity geothermal heat exchange well - Google Patents
Large capacity geothermal heat exchange well Download PDFInfo
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- WO2015016143A1 WO2015016143A1 PCT/JP2014/069673 JP2014069673W WO2015016143A1 WO 2015016143 A1 WO2015016143 A1 WO 2015016143A1 JP 2014069673 W JP2014069673 W JP 2014069673W WO 2015016143 A1 WO2015016143 A1 WO 2015016143A1
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- Prior art keywords
- heat exchange
- capacity
- sleeve tube
- pipe
- porous sleeve
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/30—Geothermal collectors using underground reservoirs for accumulating working fluids or intermediate fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B23/00—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect
- F25B23/006—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect boiling cooling systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- 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
- a heat exchange duct for introducing heat from the outside of the pipe is filled inside a perforated pipe vertically provided in the ground, and a material having a large water permeability such as gravel is filled around the pipe.
- a material having a large water permeability such as gravel is filled around the pipe.
- the internal structure of the hollow pile is (1) a steel tube pile filled with grout (solidified fluid such as cement (mortar) type, glass type, synthetic resin type) U tube (pile diameter) Indirect heat exchange system that indirectly exchanges heat with the ground by using grout as a medium by inserting a pair), and (2) direct heat exchange in which water stored inside is circulated and used as heat source water There is a method.
- an inner pipe for underground heat exchange having an outer diameter smaller than the inner diameter of the pile is provided on the inner surface of a hollow pile such as a steel pipe pile or a concrete precast pile.
- a hollow pile such as a steel pipe pile or a concrete precast pile.
- the underground heat exchanger is provided inside a hollow pile such as a steel pipe pile or a concrete prefabricated pile after drilling.
- U-tubes and double tubes are inserted, and in order to obtain a large heat exchange capacity from them, very long piles and a large number of piles per area are required, and the construction cost is high. This hinders the promotion of heat utilization.
- Japanese Patent Laid-Open No. 2006-9335 describes a circulating closed circuit type ground facility that uses groundwater heat of a well constructed by planting a casing deeply in the ground where a water vein exists as a heat source. An underground device is described.
- JP-A-58-24762 (see Patent Document 3) artificially connects aquifer layers separated by a water-impermeable layer and having different head pressure and water temperature values without being directly exposed to the atmosphere,
- a method for collecting thermal energy from groundwater is described in which a natural groundwater flow is generated due to the head pressure difference between the two, and only the thermal energy that moves with the groundwater flow is separated and extracted from the groundwater flow by heat pipes and other good thermal conductors. ing.
- JP 2010-14359 A discloses a method of burying a heat exchange tube using underground heat, in which a heat exchange tube using underground heat is buried vertically to a predetermined depth in the ground. In which a space is opened around the heat exchange tube embedded, and a noodle-like thermoplastic resin is entangled in a three-dimensional mesh shape to solidify into a tubular shape, and has a tubular mesh shape having voids communicating with the inner surface and the outer surface A method for embedding a heat exchange tube using geothermal heat is described, in which a body is buried and the heat exchange tube is inserted vertically into the tubular net.
- none of the prior arts has solved the drawback of having a small capacity as a heat exchange device.
- a normal underground heat exchanging well has a structure in which a duct is formed by drilling the ground and flowing a heat exchanging medium, and a gap around the duct is filled with dredged sand.
- the present invention is intended to provide a large-capacity underground heat exchange well having a structure in which the capability as a underground heat exchange well is enhanced and a long well is not required.
- the large-capacity underground heat exchange well of the present invention has a porous sleeve arranged in a vertical hole opened in the ground with a certain gap from the inner wall of the vertical hole,
- the gap portion has a water-permeable structure
- a pair of or more heat exchange ducts for flowing a heat exchange medium are inserted into the porous sleeve, and the pair of or more heat exchange ducts are connected to a suction port of a device used and Connected to the discharge port, Circulating the heat exchange medium between the heat exchange duct and the utilization device, and the heat exchange medium dissipates heat in the porous sleeve tube, thereby heating the groundwater in the porous sleeve tube to cause an upward flow
- a new groundwater flows from the periphery to the lower part of the porous
- the size of the through hole provided in the wall surface of the tube is larger than the diameter of the granular material. Or a means for preventing permeation of the granular material.
- the heat exchange duct is connected to a heat pump installed outside the vertical hole to form a closed loop.
- the gap between the perforated sleeve tube and the inner wall of the vertical hole opened in the ground is filled with a material having a large water permeability such as gravel, and the cylindrical shape has a very high water permeability.
- the convection area extends to the surrounding ground, and the capacity may be further expanded, and in order to exchange a large amount of heat, the use of a duct with high heat exchange efficiency is required.
- the length of the cylindrical structure can be shortened, the installation position is shallow, and the duct can be freely put in and out of the sleeve tube. As a result, each component can be taken out, and therefore maintenance can be performed easily.
- FIG. 1 shows one embodiment of a large capacity underground heat exchange well of the present invention.
- reference numeral 14 denotes a heat pump (H) installed on the ground, and the heat pump (H) 14 can be used as a heat source for various heat-utilizing devices.
- a cylindrical structure 12 filled with water constituting the large-capacity underground heat exchange well is installed on the ground 11, and the cylindrical structure 12 is permeable to water. Is given.
- the porous sleeve tube 22 is arranged in the vertical hole 21 opened in the ground with a certain gap from the inner wall of the vertical hole 21, and gravel 31 is provided in the gap between the porous sleeve tube 22 and the inner wall of the vertical hole 21.
- the gap portion is made into a cylindrical structure 12 having water permeability.
- a pair of heat exchange media 13 are connected to each other by a U-shaped end member in the porous sleeve tube 22 for flowing the heat exchange medium, and the heat exchange medium circulates (or it).
- the pair of (or more) ducts 13 are connected to a utilization device, for example, a suction port and a discharge port of the heat pump (H) 14, and the heat exchange duct 13 and For example, a heat exchange medium is circulated between the heat pump (H) 14 and the utilization device.
- the heat exchange medium circulating in the heat exchange duct 13 dissipates heat in the porous sleeve tube 22 during cooling, so that the inside of the porous sleeve tube 22 Ascending current (W) is generated by heating the groundwater. Furthermore, fresh ground water flows from the periphery into the porous sleeve tube 22 to generate convection around the porous sleeve tube 22, and the heat dissipated due to the generation of such convection widely diffuses to the periphery, thereby forming a ground heat exchange well. The capacity of the can be greatly increased. Of course, it goes without saying that reverse convection occurs during heating and the same effect can be expected.
- the perforated sleeve tube 22 is provided with means for preventing permeation of the granular material, in which the size of the through hole 22a provided in the wall surface is smaller than the diameter of the gravel 31, or a mesh-like filter or the like. It is desirable. Of course, this is not limited as long as there is a means for preventing permeation of the granular material other than the mesh filter.
- a heat exchange medium is circulated between the heat exchange duct 13 and a utilization device including, for example, a heat pump (H) 14,
- a heat pump (H) 14 When an upward flow (W) is generated in the cylindrical structure 12 due to heat radiation from the heat exchange medium, water at a new constant temperature flows from the outside of the porous sleeve tube 22 and flows into the cylindrical structure 12. Convection occurs inside.
- heat exchange by the heat exchange duct 13 can be promoted, and the capacity of the underground heat exchange well 10 can be greatly increased.
- the heat exchange system in the normal form has been described. However, when the internal circulation material such as chlorofluorocarbon gas is taken out of the mechanism and used for the direct expansion system in which direct heat exchange is performed, the efficiency is further improved. be able to.
Abstract
[Problem] To provide a large capacity geothermal heat exchange well for which the capacity as a geothermal heat exchange well is increased and that has a structure that does not require a deep well. [Solution] A large capacity geothermal heat exchange well is characterized in that: a porous sleeve pipe is placed in a vertical hole opened in the ground with a fixed gap from the inner wall of a vertical hole; the gap region is made to be a permeable structure by way of filling the gap between the pipe and the inner wall of the vertical hole with a material, such as gravel, having good permeability; a heat exchange duct for allowing a heat exchange medium to flow is inserted into the pipe and then is connected to an inlet and a discharge port of equipment to be used; the ground water in the pipe is heated and caused to flow up by way of heat radiated by the heat exchange medium in the pipe by causing heat exchange medium to circulate between the duct and the equipment to be used; in addition, a convective flow occurs around the pipe by new ground water from the periphery flowing in the lower section of the pipe; and the radiated heat is widely dispersed to the surroundings by the occurrence of such convective flows, thereby significantly increasing the capacity as a geothermal heat exchange well.
Description
この発明は、地中に縦に設けた多孔管の内部に、管の外部から熱を導入するための熱交換ダクトを、また管の周辺には砂利のような大きな透水性を有する物質で満たされた空間を配し、前記熱交換ダクトにより熱を投入することで多孔管内部および大きな透水性を有する物質で満たされた周辺を含んだ空間において対流を生起させ、大きな熱交換容量を確保できるようにした大容量地中熱交換井に関するものである。
In this invention, a heat exchange duct for introducing heat from the outside of the pipe is filled inside a perforated pipe vertically provided in the ground, and a material having a large water permeability such as gravel is filled around the pipe. By placing heat into the space and supplying heat through the heat exchange duct, convection can occur in the space including the inside of the porous tube and the space filled with the material having a large water permeability, and a large heat exchange capacity can be secured. It relates to the large capacity underground heat exchange well.
従来、ＰＨＣ杭や鋼管杭等の中空杭からなる建築用の基礎杭を地中熱交換器の一部として利用する方法が、「地中熱ヒートポンプシステム」（北海道大学地中熱利用システム工学講座著、オーム社発行、非特許文献１参照）において提案されている。
Conventionally, the method of using building foundation piles consisting of hollow piles such as PHC piles and steel pipe piles as a part of the ground heat exchanger is the “Ground Heat Heat Pump System” (Hokkaido University Ground Heat Utilization System Engineering Course). And published by Ohm, see Non-Patent Document 1).
すなわち、前記中空杭の内部構造は、（１）グラウト（セメント（モルタル）系、ガラス系、合成樹脂系などの流動性のある固化材）を充填した鋼管杭内部に、Ｕチューブ(杭の口径が大きい場合には数組)を挿入することによりグラウトを媒体として間接的に地盤と熱交換する間接熱交換方式と、（２）内部にためた水そのものを熱源水として循環利用する直接熱交換方式がある。
That is, the internal structure of the hollow pile is (1) a steel tube pile filled with grout (solidified fluid such as cement (mortar) type, glass type, synthetic resin type) U tube (pile diameter) Indirect heat exchange system that indirectly exchanges heat with the ground by using grout as a medium by inserting a pair), and (2) direct heat exchange in which water stored inside is circulated and used as heat source water There is a method.
ちなみに、特開２００６－５２５８８号公報（特許文献１参照）には、鋼管杭またはコンクリート既成杭等の中空杭の内面に、杭内径よりも小さな外径の地中熱交換用内管を杭軸に沿って設置して地中熱交換用内管付杭とし、その地中熱交換用内管付杭を打設した後に、前記の地中熱交換用内管をＵ字管方式あるいは二重管方式等の地中熱交換器の一部として利用して地中熱交換器を構築するものである。
しかしながら、特開２００６－５２５８８号公報（特許文献１参照）の地中熱交換器の構築方法においては、地中熱交換器として削孔後の鋼管杭またはコンクリート既成杭等の中空杭の内部にＵ字管や二重管を挿入するものであり、そこから大きな熱交換容量を得るためには非常に長延長の杭や面積当たりに多数の杭が必要で、施工費も嵩み、地中熱利用促進の妨げとなっている。 Incidentally, in Japanese Patent Laid-Open No. 2006-52588 (see Patent Document 1), an inner pipe for underground heat exchange having an outer diameter smaller than the inner diameter of the pile is provided on the inner surface of a hollow pile such as a steel pipe pile or a concrete precast pile. After installing the pile with the inner pipe for underground heat exchange, the above-mentioned inner pipe for underground heat exchange is formed into a U-shaped pipe or double A ground heat exchanger is constructed by using it as a part of a pipe type ground heat exchanger.
However, in the construction method of the underground heat exchanger disclosed in Japanese Patent Application Laid-Open No. 2006-52588 (see Patent Document 1), the underground heat exchanger is provided inside a hollow pile such as a steel pipe pile or a concrete prefabricated pile after drilling. U-tubes and double tubes are inserted, and in order to obtain a large heat exchange capacity from them, very long piles and a large number of piles per area are required, and the construction cost is high. This hinders the promotion of heat utilization.
しかしながら、特開２００６－５２５８８号公報（特許文献１参照）の地中熱交換器の構築方法においては、地中熱交換器として削孔後の鋼管杭またはコンクリート既成杭等の中空杭の内部にＵ字管や二重管を挿入するものであり、そこから大きな熱交換容量を得るためには非常に長延長の杭や面積当たりに多数の杭が必要で、施工費も嵩み、地中熱利用促進の妨げとなっている。 Incidentally, in Japanese Patent Laid-Open No. 2006-52588 (see Patent Document 1), an inner pipe for underground heat exchange having an outer diameter smaller than the inner diameter of the pile is provided on the inner surface of a hollow pile such as a steel pipe pile or a concrete precast pile. After installing the pile with the inner pipe for underground heat exchange, the above-mentioned inner pipe for underground heat exchange is formed into a U-shaped pipe or double A ground heat exchanger is constructed by using it as a part of a pipe type ground heat exchanger.
However, in the construction method of the underground heat exchanger disclosed in Japanese Patent Application Laid-Open No. 2006-52588 (see Patent Document 1), the underground heat exchanger is provided inside a hollow pile such as a steel pipe pile or a concrete prefabricated pile after drilling. U-tubes and double tubes are inserted, and in order to obtain a large heat exchange capacity from them, very long piles and a large number of piles per area are required, and the construction cost is high. This hinders the promotion of heat utilization.
その他、特開２００６－９３３５号公報（特許文献２参照）には、水脈が存在する地中深くケーシングを植設せしめることにより構築される井戸の地下水熱を熱源として利用する循環密閉回路式地上設備の地中装置が記載されている。
また、特開平５８－２４７６２号公報（特許文献３参照）には、不透水層に隔てられて水頭圧ならびに水温値を異にする帯水層間を大気に直接さらすことなく人工的に連結し、両者間の水頭圧差による自然な地下水流を発生させ、地下水流とともに移動する熱エネルギーだけをヒートパイプその他の熱良導体によって該地下水流より分離抽出するようにした地下水からの熱エネルギー採取方法が記載されている。
さらに、特開２０１０－１４３５９号公報（特許文献４参照）には、地中熱を利用する熱交換チューブを地中の所定の深さまで縦向きに埋設する地中熱利用熱交換チューブの埋設方法において、前記熱交換チューブが埋設される周囲に空間を開けて、麺状の熱可塑性樹脂を３次元で網状に絡ませて管状に成形固化し、内表面と外表面に連通する空隙を有する管状網状体を埋設し、この管状網状体の中に前記熱交換チューブを縦向きに挿入するようにしたことを特徴とする地中熱利用熱交換チューブの埋設方法が記載されている。
しかしながらいずれの先行技術も、熱交換装置としての能力が小さいという欠点については何も解決されていない。 In addition, Japanese Patent Laid-Open No. 2006-9335 (see Patent Document 2) describes a circulating closed circuit type ground facility that uses groundwater heat of a well constructed by planting a casing deeply in the ground where a water vein exists as a heat source. An underground device is described.
JP-A-58-24762 (see Patent Document 3) artificially connects aquifer layers separated by a water-impermeable layer and having different head pressure and water temperature values without being directly exposed to the atmosphere, A method for collecting thermal energy from groundwater is described in which a natural groundwater flow is generated due to the head pressure difference between the two, and only the thermal energy that moves with the groundwater flow is separated and extracted from the groundwater flow by heat pipes and other good thermal conductors. ing.
Furthermore, JP 2010-14359 A (see Patent Document 4) discloses a method of burying a heat exchange tube using underground heat, in which a heat exchange tube using underground heat is buried vertically to a predetermined depth in the ground. In which a space is opened around the heat exchange tube embedded, and a noodle-like thermoplastic resin is entangled in a three-dimensional mesh shape to solidify into a tubular shape, and has a tubular mesh shape having voids communicating with the inner surface and the outer surface A method for embedding a heat exchange tube using geothermal heat is described, in which a body is buried and the heat exchange tube is inserted vertically into the tubular net.
However, none of the prior arts has solved the drawback of having a small capacity as a heat exchange device.
また、特開平５８－２４７６２号公報（特許文献３参照）には、不透水層に隔てられて水頭圧ならびに水温値を異にする帯水層間を大気に直接さらすことなく人工的に連結し、両者間の水頭圧差による自然な地下水流を発生させ、地下水流とともに移動する熱エネルギーだけをヒートパイプその他の熱良導体によって該地下水流より分離抽出するようにした地下水からの熱エネルギー採取方法が記載されている。
さらに、特開２０１０－１４３５９号公報（特許文献４参照）には、地中熱を利用する熱交換チューブを地中の所定の深さまで縦向きに埋設する地中熱利用熱交換チューブの埋設方法において、前記熱交換チューブが埋設される周囲に空間を開けて、麺状の熱可塑性樹脂を３次元で網状に絡ませて管状に成形固化し、内表面と外表面に連通する空隙を有する管状網状体を埋設し、この管状網状体の中に前記熱交換チューブを縦向きに挿入するようにしたことを特徴とする地中熱利用熱交換チューブの埋設方法が記載されている。
しかしながらいずれの先行技術も、熱交換装置としての能力が小さいという欠点については何も解決されていない。 In addition, Japanese Patent Laid-Open No. 2006-9335 (see Patent Document 2) describes a circulating closed circuit type ground facility that uses groundwater heat of a well constructed by planting a casing deeply in the ground where a water vein exists as a heat source. An underground device is described.
JP-A-58-24762 (see Patent Document 3) artificially connects aquifer layers separated by a water-impermeable layer and having different head pressure and water temperature values without being directly exposed to the atmosphere, A method for collecting thermal energy from groundwater is described in which a natural groundwater flow is generated due to the head pressure difference between the two, and only the thermal energy that moves with the groundwater flow is separated and extracted from the groundwater flow by heat pipes and other good thermal conductors. ing.
Furthermore, JP 2010-14359 A (see Patent Document 4) discloses a method of burying a heat exchange tube using underground heat, in which a heat exchange tube using underground heat is buried vertically to a predetermined depth in the ground. In which a space is opened around the heat exchange tube embedded, and a noodle-like thermoplastic resin is entangled in a three-dimensional mesh shape to solidify into a tubular shape, and has a tubular mesh shape having voids communicating with the inner surface and the outer surface A method for embedding a heat exchange tube using geothermal heat is described, in which a body is buried and the heat exchange tube is inserted vertically into the tubular net.
However, none of the prior arts has solved the drawback of having a small capacity as a heat exchange device.
以上のように、通常の地中熱交換井は、地面を削孔して熱交換用媒体を流すダクトを挿入し、ダクト周辺の隙間に硅砂を充填した構造となっている。しかし、熱交換装置としての能力が小さいため、通常１００ｍもの長尺の井戸が複数必要となる。
したがってこの発明は、地中熱交換井としての能力が増強され、長尺の井戸を不要とする構造の大容量地中熱交換井を提供しようとするものである。 As described above, a normal underground heat exchanging well has a structure in which a duct is formed by drilling the ground and flowing a heat exchanging medium, and a gap around the duct is filled with dredged sand. However, since the capacity as a heat exchange device is small, usually a plurality of wells as long as 100 m are required.
Therefore, the present invention is intended to provide a large-capacity underground heat exchange well having a structure in which the capability as a underground heat exchange well is enhanced and a long well is not required.
したがってこの発明は、地中熱交換井としての能力が増強され、長尺の井戸を不要とする構造の大容量地中熱交換井を提供しようとするものである。 As described above, a normal underground heat exchanging well has a structure in which a duct is formed by drilling the ground and flowing a heat exchanging medium, and a gap around the duct is filled with dredged sand. However, since the capacity as a heat exchange device is small, usually a plurality of wells as long as 100 m are required.
Therefore, the present invention is intended to provide a large-capacity underground heat exchange well having a structure in which the capability as a underground heat exchange well is enhanced and a long well is not required.
すなわちこの発明の大容量地中熱交換井は、地面に開けた縦孔の中に、縦孔の内壁から一定の間隙を開けて多孔スリーブ管を配置し、
該多孔スリーブ管と縦孔の内壁との隙間に砂利のような大きな透水性を有する物質を充填することにより前記間隙部位を透水構造とし、
さらに前記多孔スリーブ管の中には熱交換用媒体を流すための一対もしくはそれ以上の本数の熱交換ダクトを挿入した上、該一対もしくはそれ以上の本数の熱交換ダクトを利用機器の吸込口および吐出口に接続し、
前記熱交換ダクトと利用機器との間に熱交換用媒体を循環させて、前記多孔スリーブ管内で熱交換用媒体が放熱することにより、多孔スリーブ管内の地下水を加熱して上昇流を生起させ、
さらに前記多孔スリーブ管の下部には周辺から新たな地下水が流れ込んで多孔スリーブ管とその周辺に対流が生じ、
そうした対流の発生により放熱された熱が広く周辺地盤に拡散することにより地中熱交換井としての容量を大幅に上昇させたことを特徴とするものである。 That is, the large-capacity underground heat exchange well of the present invention has a porous sleeve arranged in a vertical hole opened in the ground with a certain gap from the inner wall of the vertical hole,
By filling the gap between the perforated sleeve tube and the inner wall of the vertical hole with a material having a large water permeability such as gravel, the gap portion has a water-permeable structure,
Furthermore, a pair of or more heat exchange ducts for flowing a heat exchange medium are inserted into the porous sleeve, and the pair of or more heat exchange ducts are connected to a suction port of a device used and Connected to the discharge port,
Circulating the heat exchange medium between the heat exchange duct and the utilization device, and the heat exchange medium dissipates heat in the porous sleeve tube, thereby heating the groundwater in the porous sleeve tube to cause an upward flow,
Furthermore, a new groundwater flows from the periphery to the lower part of the porous sleeve tube, and convection occurs in the porous sleeve tube and its surroundings,
The heat dissipated by the occurrence of such convection is widely diffused to the surrounding ground, which greatly increases the capacity of the underground heat exchange well.
該多孔スリーブ管と縦孔の内壁との隙間に砂利のような大きな透水性を有する物質を充填することにより前記間隙部位を透水構造とし、
さらに前記多孔スリーブ管の中には熱交換用媒体を流すための一対もしくはそれ以上の本数の熱交換ダクトを挿入した上、該一対もしくはそれ以上の本数の熱交換ダクトを利用機器の吸込口および吐出口に接続し、
前記熱交換ダクトと利用機器との間に熱交換用媒体を循環させて、前記多孔スリーブ管内で熱交換用媒体が放熱することにより、多孔スリーブ管内の地下水を加熱して上昇流を生起させ、
さらに前記多孔スリーブ管の下部には周辺から新たな地下水が流れ込んで多孔スリーブ管とその周辺に対流が生じ、
そうした対流の発生により放熱された熱が広く周辺地盤に拡散することにより地中熱交換井としての容量を大幅に上昇させたことを特徴とするものである。 That is, the large-capacity underground heat exchange well of the present invention has a porous sleeve arranged in a vertical hole opened in the ground with a certain gap from the inner wall of the vertical hole,
By filling the gap between the perforated sleeve tube and the inner wall of the vertical hole with a material having a large water permeability such as gravel, the gap portion has a water-permeable structure,
Furthermore, a pair of or more heat exchange ducts for flowing a heat exchange medium are inserted into the porous sleeve, and the pair of or more heat exchange ducts are connected to a suction port of a device used and Connected to the discharge port,
Circulating the heat exchange medium between the heat exchange duct and the utilization device, and the heat exchange medium dissipates heat in the porous sleeve tube, thereby heating the groundwater in the porous sleeve tube to cause an upward flow,
Furthermore, a new groundwater flows from the periphery to the lower part of the porous sleeve tube, and convection occurs in the porous sleeve tube and its surroundings,
The heat dissipated by the occurrence of such convection is widely diffused to the surrounding ground, which greatly increases the capacity of the underground heat exchange well.
この発明の大容量地中熱交換井において、前記多孔スリーブ管は、周辺に充填された物質が粒状材料である場合は、管の壁面に設けた通孔のサイズが、前記粒状材料の径よりも小さく形成されているか、前記粒状材料の透過防止手段を備えていることをも特徴とするものである。
In the large-capacity underground heat exchange well according to the present invention, when the substance filled in the periphery of the porous sleeve tube is a granular material, the size of the through hole provided in the wall surface of the tube is larger than the diameter of the granular material. Or a means for preventing permeation of the granular material.
この発明の大容量地中熱交換井において、前記熱交換ダクトは、前記縦孔の外部に設置したヒートポンプに連結されて閉ループを形成されていることをも特徴とするものである。
In the large-capacity underground heat exchange well of the present invention, the heat exchange duct is connected to a heat pump installed outside the vertical hole to form a closed loop.
この発明の大容量地中熱交換井においては、多孔スリーブ管と地面に開けた縦孔の内壁との隙間に砂利のような大きな透水性を有する物質を充填して透水性の極めて大きい筒状構造体を構成し、前記多孔スリーブ管内部に設けた熱交換ダクト内に熱交換媒体を循環させることにより、透水性のある筒状構造体全体に対して地下水の対流を促進することができ、しかも周辺地盤と熱交換体である筒状構造体との接触面積が非常に広いため、熱の伝播作用による熱交換量も大きなものが期待できる。したがって、従来の熱交換井に比べ熱容量を大幅に増大させることができる。もちろん、周辺地盤の透水性が良ければ対流域が周辺地盤にまで広がり、容量はさらに拡大することも考えられ、また大量の熱を交換するためには熱交換効率の良いダクトの使用が求められる。
また、上述のように熱交換効率の飛躍的に高いダクトを利用した場合、筒状構造体の長さを短くすることができ、設置位置が浅く、スリーブ管内ではダクトが出し入れ自由に収納されているので各構成部品を取出すことができ、したがって簡便にメンテナンスすることが可能となった。 In the large-capacity underground heat exchange well according to the present invention, the gap between the perforated sleeve tube and the inner wall of the vertical hole opened in the ground is filled with a material having a large water permeability such as gravel, and the cylindrical shape has a very high water permeability. By constituting a structure and circulating a heat exchange medium in a heat exchange duct provided inside the porous sleeve tube, convection of groundwater can be promoted with respect to the entire tubular structure having water permeability, Moreover, since the contact area between the surrounding ground and the cylindrical structure as a heat exchanger is very wide, a large heat exchange amount due to heat propagation can be expected. Therefore, the heat capacity can be greatly increased as compared with the conventional heat exchange well. Of course, if the permeability of the surrounding ground is good, the convection area extends to the surrounding ground, and the capacity may be further expanded, and in order to exchange a large amount of heat, the use of a duct with high heat exchange efficiency is required. .
In addition, when a duct having a remarkably high heat exchange efficiency is used as described above, the length of the cylindrical structure can be shortened, the installation position is shallow, and the duct can be freely put in and out of the sleeve tube. As a result, each component can be taken out, and therefore maintenance can be performed easily.
また、上述のように熱交換効率の飛躍的に高いダクトを利用した場合、筒状構造体の長さを短くすることができ、設置位置が浅く、スリーブ管内ではダクトが出し入れ自由に収納されているので各構成部品を取出すことができ、したがって簡便にメンテナンスすることが可能となった。 In the large-capacity underground heat exchange well according to the present invention, the gap between the perforated sleeve tube and the inner wall of the vertical hole opened in the ground is filled with a material having a large water permeability such as gravel, and the cylindrical shape has a very high water permeability. By constituting a structure and circulating a heat exchange medium in a heat exchange duct provided inside the porous sleeve tube, convection of groundwater can be promoted with respect to the entire tubular structure having water permeability, Moreover, since the contact area between the surrounding ground and the cylindrical structure as a heat exchanger is very wide, a large heat exchange amount due to heat propagation can be expected. Therefore, the heat capacity can be greatly increased as compared with the conventional heat exchange well. Of course, if the permeability of the surrounding ground is good, the convection area extends to the surrounding ground, and the capacity may be further expanded, and in order to exchange a large amount of heat, the use of a duct with high heat exchange efficiency is required. .
In addition, when a duct having a remarkably high heat exchange efficiency is used as described above, the length of the cylindrical structure can be shortened, the installation position is shallow, and the duct can be freely put in and out of the sleeve tube. As a result, each component can be taken out, and therefore maintenance can be performed easily.
以下、図面に基いて、この発明の大容量地中熱交換井の実施の形態を詳細に説明する。
図１は、この発明の大容量地中熱交換井の１実施例を示すものである。
この実施例の大容量地中熱交換井１０において、１４は地上に設置したヒートポンプ（Ｈ）であり、該ヒートポンプ（Ｈ）１４を用いて各種の熱利用機器の熱源として利用することができる。
この発明の大容量地中熱交換井１０は、地盤１１に大容量地中熱交換井を構成する水で満たされた筒状構造体１２を設置し、かつ該筒状構造体１２に透水性を付与してある。
すなわち、地面に開けた縦孔２１の中に、縦孔２１の内壁から一定の間隙を開けて多孔スリーブ管２２を配置し、該多孔スリーブ管２２と縦孔２１の内壁との隙間に砂利３１を充填することにより前記間隙部位を透水性のある筒状構造体１２としたものである。 Hereinafter, an embodiment of a large-capacity underground heat exchange well according to the present invention will be described in detail with reference to the drawings.
FIG. 1 shows one embodiment of a large capacity underground heat exchange well of the present invention.
In the large-capacity underground heat exchange well 10 of this embodiment,reference numeral 14 denotes a heat pump (H) installed on the ground, and the heat pump (H) 14 can be used as a heat source for various heat-utilizing devices.
In the large-capacity underground heat exchange well 10 of the present invention, acylindrical structure 12 filled with water constituting the large-capacity underground heat exchange well is installed on the ground 11, and the cylindrical structure 12 is permeable to water. Is given.
That is, theporous sleeve tube 22 is arranged in the vertical hole 21 opened in the ground with a certain gap from the inner wall of the vertical hole 21, and gravel 31 is provided in the gap between the porous sleeve tube 22 and the inner wall of the vertical hole 21. The gap portion is made into a cylindrical structure 12 having water permeability.
図１は、この発明の大容量地中熱交換井の１実施例を示すものである。
この実施例の大容量地中熱交換井１０において、１４は地上に設置したヒートポンプ（Ｈ）であり、該ヒートポンプ（Ｈ）１４を用いて各種の熱利用機器の熱源として利用することができる。
この発明の大容量地中熱交換井１０は、地盤１１に大容量地中熱交換井を構成する水で満たされた筒状構造体１２を設置し、かつ該筒状構造体１２に透水性を付与してある。
すなわち、地面に開けた縦孔２１の中に、縦孔２１の内壁から一定の間隙を開けて多孔スリーブ管２２を配置し、該多孔スリーブ管２２と縦孔２１の内壁との隙間に砂利３１を充填することにより前記間隙部位を透水性のある筒状構造体１２としたものである。 Hereinafter, an embodiment of a large-capacity underground heat exchange well according to the present invention will be described in detail with reference to the drawings.
FIG. 1 shows one embodiment of a large capacity underground heat exchange well of the present invention.
In the large-capacity underground heat exchange well 10 of this embodiment,
In the large-capacity underground heat exchange well 10 of the present invention, a
That is, the
そして、前記多孔スリーブ管２２の中には熱交換用媒体を流すための熱交換ダクト１３をＵ字状の端末部材で相互に連結し、熱交換用媒体が循環するようにした一対（もしくはそれ以上の本数）を挿入した上、該一対（もしくはそれ以上の本数）のダクト１３を利用機器、例えば前記ヒートポンプ（Ｈ）１４の吸込口および吐出口に接続することにより、前記熱交換ダクト１３と、例えばヒートポンプ（Ｈ）１４からなる利用機器との間に熱交換用媒体を循環させる。
このように構成した閉ループ内を熱交換用媒体を循環させることにより、冷房時には前記多孔スリーブ管２２内において、前記熱交換ダクト１３を循環する熱交換用媒体が放熱して多孔スリーブ管２２内の地下水を加熱することとなって上昇流（Ｗ）が生起する。
さらに前記多孔スリーブ管２２内には周辺から新たな地下水が流れ込んで多孔スリーブ管２２周辺に対流が生じ、そうした対流の発生により放熱された熱が広く周辺に拡散することにより地中熱交換井としての容量を大幅に上昇させることができる。
もちろん、暖房時には逆の対流が起き、同様な効果が望めることはいうまでもない。 A pair ofheat exchange media 13 are connected to each other by a U-shaped end member in the porous sleeve tube 22 for flowing the heat exchange medium, and the heat exchange medium circulates (or it). And the pair of (or more) ducts 13 are connected to a utilization device, for example, a suction port and a discharge port of the heat pump (H) 14, and the heat exchange duct 13 and For example, a heat exchange medium is circulated between the heat pump (H) 14 and the utilization device.
By circulating the heat exchange medium in the closed loop configured as described above, the heat exchange medium circulating in theheat exchange duct 13 dissipates heat in the porous sleeve tube 22 during cooling, so that the inside of the porous sleeve tube 22 Ascending current (W) is generated by heating the groundwater.
Furthermore, fresh ground water flows from the periphery into theporous sleeve tube 22 to generate convection around the porous sleeve tube 22, and the heat dissipated due to the generation of such convection widely diffuses to the periphery, thereby forming a ground heat exchange well. The capacity of the can be greatly increased.
Of course, it goes without saying that reverse convection occurs during heating and the same effect can be expected.
このように構成した閉ループ内を熱交換用媒体を循環させることにより、冷房時には前記多孔スリーブ管２２内において、前記熱交換ダクト１３を循環する熱交換用媒体が放熱して多孔スリーブ管２２内の地下水を加熱することとなって上昇流（Ｗ）が生起する。
さらに前記多孔スリーブ管２２内には周辺から新たな地下水が流れ込んで多孔スリーブ管２２周辺に対流が生じ、そうした対流の発生により放熱された熱が広く周辺に拡散することにより地中熱交換井としての容量を大幅に上昇させることができる。
もちろん、暖房時には逆の対流が起き、同様な効果が望めることはいうまでもない。 A pair of
By circulating the heat exchange medium in the closed loop configured as described above, the heat exchange medium circulating in the
Furthermore, fresh ground water flows from the periphery into the
Of course, it goes without saying that reverse convection occurs during heating and the same effect can be expected.
前記多孔スリーブ管２２は、その壁面に設けた通孔２２ａのサイズが、前記砂利３１の径よりも小さく形成されているか、網目状のフィルタ等からなる前記粒状材料の透過防止手段を備えていることが望ましい。もちろん、網目状のフィルタ以外の前記粒状材料の透過防止手段が存在すればこの限りではない。
The perforated sleeve tube 22 is provided with means for preventing permeation of the granular material, in which the size of the through hole 22a provided in the wall surface is smaller than the diameter of the gravel 31, or a mesh-like filter or the like. It is desirable. Of course, this is not limited as long as there is a means for preventing permeation of the granular material other than the mesh filter.
この実施例の大容量地中熱交換井１０は以上のように構成したので、前記熱交換ダクト１３と、例えばヒートポンプ（Ｈ）１４からなる利用機器との間に熱交換用媒体を循環させ、該熱交換用媒体からの放熱により前記筒状構造体１２内に上昇流（Ｗ）を起こすと、前記多孔スリーブ管２２の外から新たな一定温度の水が流入して前記筒状構造体１２内に対流が生じる。
このようにして、前記熱交換ダクト１３による熱交換を促進することができ、地中熱交換井１０としての容量を格段に拡大することが可能となる。
上記実施例においては、通常の形態の熱交換方式のものについて説明したが、フロンガス等の内部循環物質を機構の外に取り出して、直接熱交換を行う直膨方式に利用すると、さらに効率を高めることができる。 Since the large-capacity underground heat exchange well 10 of this embodiment is configured as described above, a heat exchange medium is circulated between theheat exchange duct 13 and a utilization device including, for example, a heat pump (H) 14, When an upward flow (W) is generated in the cylindrical structure 12 due to heat radiation from the heat exchange medium, water at a new constant temperature flows from the outside of the porous sleeve tube 22 and flows into the cylindrical structure 12. Convection occurs inside.
Thus, heat exchange by theheat exchange duct 13 can be promoted, and the capacity of the underground heat exchange well 10 can be greatly increased.
In the above embodiment, the heat exchange system in the normal form has been described. However, when the internal circulation material such as chlorofluorocarbon gas is taken out of the mechanism and used for the direct expansion system in which direct heat exchange is performed, the efficiency is further improved. be able to.
このようにして、前記熱交換ダクト１３による熱交換を促進することができ、地中熱交換井１０としての容量を格段に拡大することが可能となる。
上記実施例においては、通常の形態の熱交換方式のものについて説明したが、フロンガス等の内部循環物質を機構の外に取り出して、直接熱交換を行う直膨方式に利用すると、さらに効率を高めることができる。 Since the large-capacity underground heat exchange well 10 of this embodiment is configured as described above, a heat exchange medium is circulated between the
Thus, heat exchange by the
In the above embodiment, the heat exchange system in the normal form has been described. However, when the internal circulation material such as chlorofluorocarbon gas is taken out of the mechanism and used for the direct expansion system in which direct heat exchange is performed, the efficiency is further improved. be able to.
前記実施例においては、この発明の大容量地中熱交換井を中空の筒状構造体を用いた場合について説明したが、この発明の要旨を変更しない範囲で、種々の変形や多様な用途への適用が可能なことはいうまでもない。
In the above embodiment, the case where the large-capacity underground heat exchange well of the present invention is formed using a hollow cylindrical structure has been described, but various modifications and various uses can be made without changing the gist of the present invention. Needless to say, is applicable.
１０ 大容量地中熱交換井
１１ 地盤
１２ 筒状構造体
１３ 熱交換ダクト
１４ ヒートポンプ（Ｈ）
２１ 縦孔
２２ 多孔スリーブ管
２２ａ 通孔
３１ 砂利
Ｗ 上昇流 10 Large-capacity underground heat exchange well 11Ground 12 Tubular structure 13 Heat exchange duct 14 Heat pump (H)
21Vertical hole 22 Perforated sleeve tube 22a Through hole 31 Gravel W Upflow
１１ 地盤
１２ 筒状構造体
１３ 熱交換ダクト
１４ ヒートポンプ（Ｈ）
２１ 縦孔
２２ 多孔スリーブ管
２２ａ 通孔
３１ 砂利
Ｗ 上昇流 10 Large-capacity underground heat exchange well 11
21
Claims (3)
- 地面に開けた縦孔の中に、縦孔の内壁から一定の間隙を開けて多孔スリーブ管を配置し、
該多孔スリーブ管と縦孔の内壁との隙間に砂利のような大きな透水性を有する物質を充填することにより前記間隙部位を透水構造とし、
さらに前記多孔スリーブ管の中には熱交換用媒体を流すための一対もしくはそれ以上の本数の熱交換ダクトを挿入した上、該一対もしくはそれ以上の本数のダクトを利用機器の吸込口および吐出口に接続し、
前記ダクトと利用機器との間に熱交換用媒体を循環させて、前記多孔スリーブ管内で熱交換用媒体が放熱することにより、多孔スリーブ管内の地下水を加熱して上昇流を生起させ、
さらに前記多孔スリーブ管の下部には周辺から新たな地下水が流れ込んで多孔スリーブ管とその周辺に対流が生じ、
そうした対流の発生により放熱された熱が広く周辺に拡散することにより地中熱交換井としての容量を大幅に上昇させたことを特徴とする大容量地中熱交換井。 In the vertical hole opened in the ground, a porous sleeve is arranged with a certain gap from the inner wall of the vertical hole,
By filling the gap between the perforated sleeve tube and the inner wall of the vertical hole with a material having a large water permeability such as gravel, the gap portion has a water-permeable structure,
Furthermore, a pair of or more heat exchange ducts for flowing a heat exchange medium are inserted into the porous sleeve tube, and the pair of or more ducts are used as a suction port and a discharge port of a device. Connected to
Circulating a heat exchange medium between the duct and the utilization device, and the heat exchange medium dissipates heat in the porous sleeve tube, thereby heating the groundwater in the porous sleeve tube to cause an upward flow,
Furthermore, a new groundwater flows from the periphery to the lower part of the porous sleeve tube, and convection occurs in the porous sleeve tube and its surroundings,
A large-capacity geothermal heat exchange well characterized in that the capacity of the geothermal heat exchange well has been greatly increased by the heat dissipated by the generation of such convection widely spreading to the periphery. - 前記多孔スリーブ管は、周辺に充填された物質が粒状材料である場合は、管の壁面に設けた通孔のサイズが、前記粒状材料の径よりも小さく形成されているか、前記粒状材料の透過防止手段を備えていることを特徴とする請求項１に記載の大容量地中熱交換井。 When the material filled in the periphery of the porous sleeve tube is a granular material, the size of the through-hole provided in the wall surface of the tube is smaller than the diameter of the granular material or the permeation of the granular material The large-capacity underground heat exchange well according to claim 1, further comprising prevention means.
- 前記熱交換ダクトは、前記縦孔の外部に設置したヒートポンプに連結されて閉ループを形成されていることを特徴とする請求項１または２に記載の大容量地中熱交換井。 The large-capacity underground heat exchange well according to claim 1, wherein the heat exchange duct is connected to a heat pump installed outside the vertical hole to form a closed loop.
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| CN106247646A (en) * | 2016-09-08 | 2016-12-21 | 天津大学 | Hot systems is taken under a kind of mid-deep strata geothermal well |
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| JP2007017137A (en) * | 2005-07-05 | 2007-01-25 | Geo System Kk | Piping structure for heat exchange well |
| JP2011191014A (en) * | 2010-03-16 | 2011-09-29 | Sumitomo Fudosan Kk | Underground heat use system |
| JP5009683B2 (en) * | 2007-05-23 | 2012-08-22 | 株式会社エコ・パワー | Geothermal utilization system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4928644B1 (en) * | 2011-07-21 | 2012-05-09 | 秀樹 中込 | Convection type underground heat exchange well |
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2013
- 2013-07-29 JP JP2013157200A patent/JP2015025643A/en active Pending
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- 2014-07-25 WO PCT/JP2014/069673 patent/WO2015016143A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2058334A (en) * | 1979-09-05 | 1981-04-08 | Feist Artus | Method of extracting heat from the earth and apparatus for performing the method |
| JP3504258B1 (en) * | 2003-08-27 | 2004-03-08 | 有限会社ヒタカ | Cooling and heating system using geothermal |
| JP2007017137A (en) * | 2005-07-05 | 2007-01-25 | Geo System Kk | Piping structure for heat exchange well |
| JP5009683B2 (en) * | 2007-05-23 | 2012-08-22 | 株式会社エコ・パワー | Geothermal utilization system |
| JP2011191014A (en) * | 2010-03-16 | 2011-09-29 | Sumitomo Fudosan Kk | Underground heat use system |
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| CN106247646A (en) * | 2016-09-08 | 2016-12-21 | 天津大学 | Hot systems is taken under a kind of mid-deep strata geothermal well |
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