JP2009002595A - Efficient heat collection system for underground heat well - Google Patents

Efficient heat collection system for underground heat well Download PDF

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JP2009002595A
JP2009002595A JP2007164807A JP2007164807A JP2009002595A JP 2009002595 A JP2009002595 A JP 2009002595A JP 2007164807 A JP2007164807 A JP 2007164807A JP 2007164807 A JP2007164807 A JP 2007164807A JP 2009002595 A JP2009002595 A JP 2009002595A
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heat
well
underground
pipe
heat collecting
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JP4486663B2 (en
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Seikichi Hanada
征吉 花田
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BESCON SERVICE KK
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/20—Geothermal collectors using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
    • 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

Abstract

<P>PROBLEM TO BE SOLVED: To provide an efficient heat collection system for an underground heat well capable of efficiently utilizing both underground heat energy and underground water heat energy which are gifts from the earth. <P>SOLUTION: In this underground heat well, underground water is stored in a ring-shaped heat collecting space between an excavated well 1 and a well casing 2, and the periphery of an indirect heat collection pipe 3 is filled with a filter layer 6 for heat exchange promotion or efficiently transmitting underground heat from the filter layer 6 to the heat collection pipe 3. A circulation pump 18 for underground heat collection on the ground is driven for circulating a brine placed in the heat collection pipe 3 through the heat collection pipe 3, a return header 17, the circulation pump 18, a plate heat exchanger 19 for increasing heat source water temperature, a water condenser 15 (the heat pump device utilizing underground heat), a forward header 16, and the heat collection pipe 3 in this order. The underground heat is indirectly utilized as the heat source of the water condenser 15 of the heat pump device utilizing the underground heat. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、地中熱エネルギーと地下水熱エネルギーの両方を効率よく利用できる地中熱井戸の高効率な集熱システムに関する。   The present invention relates to a highly efficient heat collection system for a geothermal well that can efficiently use both geothermal energy and groundwater thermal energy.

地球温暖化防止やＣＯ２排出規制に伴い、世界的に環境負荷の少ない自然エネルギーの利用技術が急速に開発され、活用されている。一般的に、自然エネルギーは自然条件に左右されやすく、季節的、時間的にも需要と供給の不均衡が生じ、貯蔵技術などにより平滑化することが必要である。地中熱や地下水熱はエネルギー密度が低いが、定常的で地域的な偏在性が少なく、熱エネルギー資源として安定的に利用が可能である。ＮＥＤＯ（独立行政法人新エネルギー・産業技術総合開発機構）発行の「地球熱利用システム、地中熱利用ヒートポンプシステムの特徴と課題」という小冊子で、世界的には地熱ヒートポンプの利用が延びているとし、その普及状況が記載されている。２００５年の世界での地中熱利用ヒートポンプシステムの設備要領（Ｍｗｔ）の表より、アメリカ７２００、スウェーデン３８４０、中国６３１、ノルウェー６００、スイス５３２、カナダ４３５、ドイツ４００、デンマーク３０９、日本４となっている。この表で気がつき驚くことは、地球温暖化防止の京都議定書に反対しているアメリカが７２００Ｍｗｔ、日本が４Ｍｗｔとアメリカが日本の１８００倍も普及していることです。日本で地中熱利用ヒートポンプシステムが普及しない理由は熱源となる地中熱用井戸の工事費が高いからといわれています。日本はアメリカやヨーロッパ、中国などと比較して地質的に礫（石、岩石）が多く、ボーリング工事費が非常に高額となり、初期投資コストが過大となり普及し難いという問題があります。又これまで日本の地中熱利用ヒートポンプの技術はヨーロッパやアメリカで多く使用されています。Ｕチューブというポリエチレン管を地中に埋設し管の中にブライン水を入れ循環し地中から熱を回収する方法がそのまま利用されています。日本でもこれまで井水利用のヒートポンプパッケージエアコンやヒートポンプチラーが利用されてきましたが、あまり普及しませんでした。その理由の一つがくみ上げ規制ですが、多くの阻害要因は井水より熱を汲み上げたり熱を放出するコンデンサーやエバポレータが銅管を使ったシェルアンドチューブ型の熱交換器でした。銅は水質が悪いと腐食し、孔が明きます。孔が明くと冷媒ガス（その頃はＲ１２又はＲ２２が主流）が漏洩し、又水がコンプレッサーに浸水し、コンプレッサーの損傷を引き起こし、多大な修理費がかかり需要家から敬遠され大きな普及をしないまま今日に至っています。最近は銅管を使ったシェルアンドチューブ型からＳＵＳ製のプレート型に変わってきており、耐久性は大きく向上してきています。最近地中熱利用ヒートポンプシステムは急速にその性能が向上してきております。その理由の一つは新冷媒Ｒ４１０Ａの登場です。この冷媒は高温側で効率よく温水を作る能力に優れ、成績係数ＣＯＰが４．５以上と高いのが特長です。
従来、地下水を熱源とするヒートポンプ設備が特許出願されている（特許文献１を参照）。
この公知技術では、不透水性土層の上下に上部帯水層及び下部帯水層が存在している地盤に下部帯水層に達する井戸を設け、その内部を不透水性土層の位置でパッカーにより上下に仕切り、上部帯水層及び下部帯水層に通じる上部スクリーン及び下部スクリーンを設け、パッカーの近傍にヒートポンプ装置を配置し、パッカーの上下に季節により選択的に運転されてヒートポンプ装置に地下水を供給する上部ポンプ及び下部ポンプ、もしくは地下水の供給経路を切替え可能な単独のポンプを設置し、ヒートポンプ装置は第１熱交換器及び第２熱交換器を有し、地表部には第２熱交換器に対して熱媒体を循環供給するポンプを設けたものである。
また、熱交換パイプと揚液ポンプをユニット化した地下熱採取ユニットが特許出願されている（特許文献２を参照）。
この公知技術は、Ｕ字状に折曲した熱交換パイプを複数本筒状に束ね、各パイプの一端はユニット上部の円形の液体槽に接続し、他端は液体槽の中心を貫いて下方に延びるポンプ室筒体の下部に接続し、ポンプ室筒体の中にエアーリフトポンプを収め、熱交換パイプの周りをスクリーンで覆い、地面に掘った穴の中に設置し、熱交換パイプが地下水に浸かるようにしたものである。
特開平９−２８０６８９号公報 特開２００５−３３７５９０号公報 Along with the prevention of global warming and CO2 emission regulations, technologies for utilizing natural energy with a low environmental impact are rapidly being developed and utilized worldwide. In general, natural energy is easily affected by natural conditions, and there is an imbalance between supply and demand both seasonally and temporally, and it is necessary to smooth it by storage technology. Geothermal and groundwater heat have a low energy density, but they are stationary and have little regional uneven distribution and can be used stably as thermal energy resources. A booklet titled “Characteristics and Problems of Geothermal Utilization System and Geothermal Heat Utilization Heat Pump System” issued by NEDO (New Energy and Industrial Technology Development Organization), and the use of geothermal heat pumps is expanding worldwide. , The spread status is described. Based on the table of geothermal heat pump system facilities (Mwt) in the world in 2005, it became USA 7200, Sweden 3840, China 631, Norway 600, Switzerland 532, Canada 435, Germany 400, Denmark 309, Japan 4 ing. What is surprising in this table is that the US, which is against the Kyoto Protocol to prevent global warming, is 7200Mwt, Japan is 4Mwt, and the US is 1800 times as popular as Japan. The reason why geothermal heat pump systems are not widespread in Japan is said to be due to the high construction costs of geothermal wells that serve as heat sources. In Japan, there are many gravels (stones, rocks) in geology compared to the United States, Europe, China, etc., and there is a problem that boring construction costs are very high, initial investment costs are excessive, and it is difficult to spread. Until now, Japanese geothermal heat pump technology has been widely used in Europe and America. A method of recovering heat from the ground by embedding a polyethylene tube called U-tube in the ground, putting brine water in the tube and circulating it is used as it is. In Japan, heat pump packaged air conditioners and heat pump chillers using well water have been used until now, but they have not been widely used. One of the reasons for this is the regulation of pumping up, but many of the obstacles are shell-and-tube heat exchangers that use copper tubes for condensers and evaporators that pump heat from well water and release heat. Copper is corroded and pierced when the water quality is poor. When the hole is opened, refrigerant gas (R12 or R22 is the mainstream at that time) leaks, and water infiltrates into the compressor, causing damage to the compressor. Today. Recently, the shell and tube type using copper pipe has been changed to the SUS plate type, and the durability has been greatly improved. Recently, the performance of geothermal heat pump systems has been improving rapidly. One of the reasons is the appearance of the new refrigerant R410A. This refrigerant has an excellent ability to produce hot water efficiently on the high temperature side, and has a high coefficient of performance COP of 4.5 or more.
Conventionally, a patent application has been filed for a heat pump facility using groundwater as a heat source (see Patent Document 1).
In this known technique, a well reaching the lower aquifer is provided on the ground where the upper aquifer and the lower aquifer exist above and below the impermeable soil layer, and the inside is located at the position of the impermeable soil layer. The upper and lower screens leading to the upper aquifer and the lower aquifer are provided by the packer, and the heat pump device is arranged near the packer, and the heat pump device is selectively operated depending on the season above and below the packer. An upper pump and a lower pump for supplying groundwater, or a single pump capable of switching the groundwater supply path are installed. The heat pump apparatus has a first heat exchanger and a second heat exchanger, and a second surface is provided on the ground surface. A pump that circulates and supplies a heat medium to the heat exchanger is provided.
In addition, a patent application has been filed for an underground heat collection unit in which a heat exchange pipe and a pump are unitized (see Patent Document 2).
In this known technique, a plurality of U-shaped heat exchange pipes are bundled in a cylindrical shape, one end of each pipe is connected to a circular liquid tank at the upper part of the unit, and the other end passes through the center of the liquid tank and goes down. Connected to the lower part of the pump chamber cylinder that extends into the pump chamber, the air lift pump is housed in the pump chamber cylinder, the heat exchange pipe is covered with a screen, installed in a hole dug in the ground, and the heat exchange pipe It is soaked in groundwater.
Japanese Patent Laid-Open No. 9-280689 JP 2005-337590 A

本発明は、地球からの贈り物である地中熱エネルギーと地下水熱エネルギーの両方を効率よく利用できる地中熱井戸の高効率な集熱システムを提供することを目的とする。   An object of the present invention is to provide a highly efficient heat collection system for a geothermal well that can efficiently use both geothermal energy and groundwater thermal energy, which are gifts from the earth.

本発明の地中熱井戸の高効率な集熱システムは、地表から帯水層に達する所定深さまでボーリングにより所定口径の円形断面の掘削孔を掘削して掘削井戸とし、該掘削井戸内には、上下が開口した筒状の井戸ケージングを上部開口が地表で下部開口が井戸底部に位置するように同心円状に設け、前記掘削井戸と前記井戸ケーシングとの間には間接方式の集熱パイプが設置される円環状の集熱空間が形成され、前記掘削井戸の内壁にはラピリ層、細砂流入防止用不織布を設けて帯水層の地下水のみが前記集熱空間内に浸透するように形成し、前記集熱パイプはブラインを循環させ、前記集熱空間を縦断するように地表から井戸底部へ直線的に向かい、井戸底部付近で井戸ケーシングを横断して反対側に突き出し、さらに前記集熱空間を井戸底部付近から地表に直線的に向かう往き及び戻りのＵ字状に略等間隔に複数組設置され、前記井戸ケーシングの内部には、地表から揚水管により吊り下げた井戸ポンプが少なくとも帯水層レベル以下に位置する部分に設けられ、一方、地表の地中熱井戸周囲には、集熱パイプの往きヘッダー及び戻りヘッダーを設け、該戻りヘッダーから配管を介して地中熱利用ヒートポンプ装置の水式コンデンサーから往きヘッダーへ循環させ、前記集熱パイプにより集熱した地下水熱を地中熱利用ヒートポンプ装置の水式コンデンサーの熱源に利用するものである。
本発明の地中熱井戸の高効率な集熱システムは、戻りヘッダーと地中熱利用ヒートポンプ装置の水式コンデンサーとの途中に熱源水昇温用プレート式熱交換器を設け、井戸ポンプからの地下水が揚水管から前記熱源水昇温用プレート式熱交換器へ供給され、前記集熱パイプのブラインと熱交換されて地中熱利用ヒートポンプ装置の水式コンデンサーの熱源に利用され、自然放流又は還流されるものである。
本発明の地中熱井戸の高効率な集熱システムは、集熱空間の前記集熱パイプの周囲には、熱交換促進用フィルター層が充填され、地下水熱を効率的に前記熱交換促進用フィルター層から集熱パイプへ伝熱することができるものである。
本発明の地中熱井戸の高効率な集熱システムは、井戸ケーシング内部には、サーモスタットを上下に適宜個数配置し、間接方式の集熱パイプで集熱されたブラインの温度が所定の温度以下になるような場合は、井戸ポンプにより井戸周囲の地下水を汲み上げることにより集熱パイプの周囲の温度を上昇させることができるものである。 The highly efficient heat collecting system for geothermal wells according to the present invention excavates a circular cross-section of a predetermined diameter by boring to a predetermined depth reaching the aquifer from the surface of the earth, and in the excavation well A cylindrical well caging with upper and lower openings is provided concentrically so that the upper opening is on the ground surface and the lower opening is located at the bottom of the well, and an indirect heat collecting pipe is provided between the drilling well and the well casing. An annular heat collecting space to be installed is formed, and an inner wall of the excavation well is provided with a rapili layer and a nonwoven fabric for preventing fine sand inflow so that only the groundwater of the aquifer penetrates into the heat collecting space The heat collecting pipe circulates brine, goes straight from the surface to the bottom of the well so as to traverse the heat collecting space, protrudes to the opposite side across the well casing near the bottom of the well, and further The bottom of the well A plurality of sets are installed at approximately equal intervals in a forward and return U-shape that goes straight from the near to the ground surface, and at the inside of the well casing, a well pump suspended from the ground surface by a pump is at least below the aquifer level On the other hand, on the surface of the geothermal well on the ground surface, a forward header and a return header of a heat collecting pipe are provided, and a water condenser of a heat pump device using geothermal heat is provided from the return header through a pipe. The groundwater heat collected from the heat collecting pipe is used as a heat source for the water condenser of the geothermal heat pump device.
The highly efficient heat collecting system of the geothermal well of the present invention is provided with a plate heat exchanger for raising the temperature of the heat source water in the middle of the return header and the water condenser of the heat pump device using geothermal heat. Groundwater is supplied to the plate heat exchanger for raising the temperature of the heat source water from the pumping pipe, is heat-exchanged with the brine of the heat collecting pipe, and is used as a heat source of the water condenser of the underground heat utilization heat pump device. Is to be refluxed.
The highly efficient heat collecting system of the underground heat well according to the present invention includes a heat exchange promoting filter layer around the heat collecting pipe in the heat collecting space to efficiently use groundwater heat for promoting the heat exchange. Heat can be transferred from the filter layer to the heat collecting pipe.
The highly efficient heat collecting system for underground heat wells according to the present invention has an appropriate number of thermostats arranged vertically in the well casing, and the temperature of the brine collected by the indirect heat collecting pipe is below a predetermined temperature. In such a case, the temperature around the heat collecting pipe can be raised by pumping the groundwater around the well with a well pump.

本発明の地中熱井戸の高効率な集熱システムは、従来方式では地下水を集熱パイプの周囲に集めて地下水熱及び地中熱をヒートポンプの熱源として利用するもので集熱パイプの周囲が土やコンクリートやベントナイト等の水に比較して熱伝導率の悪いものを使用していたが、本方式は集熱パイプの周囲を水が流動される熱交換促進用フィルター層を配置し、水の伝導率を生かした、より効率のよい方法でＳＵＳ管、銅管、ポリエチレン管、ポリブデン管、ＶＰ管等の集熱パイプにより地中熱を採取できる。
本発明の地中熱井戸の高効率な集熱システムは、間接方式の集熱パイプを包囲する掘削井戸と、地下水を複数のサーモスタットにより地下水を汲み上げる井戸ケーシングパイプ、ストレーナーを兼用する井戸ケージングとの二重筒体構造からなり、その井戸ケージング内部には水中ポンプ、汲み上げジェットポンプ、エアーポンプ等の井戸ポンプを設置できる構造となっている。
本発明の地中熱井戸の高効率な集熱システムは、間接方式の集熱パイプで集熱されたブライン（循環水）の温度が所定の温度（０℃）以下になるような場合は（サーモスタットにより連続管理している）井戸ポンプにより集熱パイプ周囲の地下水を汲み上げることにより集熱パイプの周囲の温度を上昇させると共に汲み上げた地下水でプレート式熱交換器を介して所定の温度（＋８℃）以上になるように自動的に流量をコントロールできる効果がある。
本発明の地中熱井戸の高効率な集熱システムは、間接方式の集熱パイプの井戸ケーシングへの取付方法において、水中ポンプの設置に支障なく集熱パイプを効果的に取付できる効果がある。
本発明の地中熱井戸の高効率な集熱システムは、帯水層から地下水を井戸ケーシング外側に設置した集熱パイプに誘引し、集熱効果を高めるために集熱パイプに熱交換促進用フィルター層を被せるように設置したものである。 In the conventional method, the high-efficiency heat collection system of the geothermal well of the present invention collects groundwater around the heat collection pipe and uses the groundwater heat and ground heat as a heat source of the heat pump. Although water with low thermal conductivity compared to water such as soil, concrete, and bentonite was used, this method places a filter layer for promoting heat exchange that allows water to flow around the heat collecting pipe. The ground heat can be collected by a heat collecting pipe such as a SUS pipe, a copper pipe, a polyethylene pipe, a polybden pipe, and a VP pipe by a more efficient method making use of the conductivity.
The highly efficient heat collecting system for geothermal wells according to the present invention includes an excavation well that surrounds an indirect heat collecting pipe, a well casing pipe that pumps ground water using a plurality of thermostats, and a well caging that also serves as a strainer. It consists of a double cylinder structure, and it has a structure in which well pumps such as submersible pumps, pumping jet pumps, and air pumps can be installed inside the well casing.
When the temperature of the brine (circulated water) collected by the indirect heat collecting pipe is below a predetermined temperature (0 ° C.), the highly efficient heat collecting system of the underground heat well of the present invention ( The temperature around the heat collection pipe is raised by pumping up the groundwater around the heat collection pipe with a well pump (continuously managed by a thermostat), and at the specified temperature (+ 8 ° C) via the plate heat exchanger with the groundwater pumped up ) Has the effect of automatically controlling the flow rate so that
The highly efficient heat collecting system of the underground heat well according to the present invention has an effect that the heat collecting pipe can be effectively attached without hindering the installation of the submersible pump in the method of attaching the indirect heat collecting pipe to the well casing. .
The highly efficient heat collecting system for underground heat wells of the present invention attracts groundwater from the aquifer to a heat collecting pipe installed outside the well casing, and promotes heat exchange in the heat collecting pipe to enhance the heat collecting effect. It is installed so as to cover the filter layer.

本発明の地中熱井戸の高効率な集熱システムの一実施例を添付図面に基づいて、以下に説明する。
図１の本発明の地中熱井戸の高効率な集熱システムの概略系統図に示すように、地表から帯水層に達する所定の深さまでボーリングにより所定口径の円形断面の掘削孔を掘削して掘削井戸１とする。
前記掘削井戸１内には、上下が開口した筒状の井戸ケージング２を上部開口が地表で下部開口が井戸底部に位置するように同心円状に設け、前記掘削井戸１と前記井戸ケーシング２との間には間接方式の集熱パイプ３が設置される円環状の集熱空間が形成される。
前記集熱パイプ３は、ＳＵＳ管、銅管、ポリエチレン管、ポリブデン管、ＶＰ管等から形成され、図２の縦断面図に示すように、前記集熱空間を縦断するように地表から井戸底部へ直線的に向かい、井戸底部付近で井戸ケーシング２を横断して反対側に突き出し、さらに前記集熱空間を井戸底部付近から地表に直線的に向かうＵ字状に設置され、このような集熱パイプ３が略等間隔で往き及び戻りの複数組の集熱パイプ３が設置される。
なお、前記井戸底部の集熱パイプ３より下方には、ラピリ（火山礫）が充填されてラピリ層４が形成されている。
図３の拡大横断面図に示すように、前記掘削井戸１の内周壁部分にはラピリ（火山礫）を充填し、ラピリ層４の内側に細砂流入防止用不織布５を設けて帯水層の地下水のみが前記掘削井戸１内に浸透するように形成する。
そして、前記集熱パイプ３の外周囲には前記細砂流入防止用不織布５が配置され、前記集熱パイプ３の隙間にはポリエチレンフィルター等の熱交換促進用フィルター層６が充填され、地下水熱を効率的に前記熱交換促進用フィルター層６から集熱パイプ３へ伝熱するように構成する。
なお、前記熱交換促進用フィルター層６は、ポリエチレンフィルターに限らず、ラピリ（火山礫）を充填したラピリ層４とすることもできる。 One embodiment of a highly efficient heat collecting system for a geothermal well according to the present invention will be described below with reference to the accompanying drawings.
As shown in the schematic system diagram of the high efficiency heat collecting system of the geothermal well of the present invention in FIG. 1, a drilling hole having a circular cross section with a predetermined diameter is drilled by boring from the ground surface to a predetermined depth reaching the aquifer. The borehole 1 is used.
In the excavation well 1, a cylindrical well casing 2 having an upper and lower opening is provided concentrically so that the upper opening is located on the ground surface and the lower opening is located at the bottom of the well, and the excavation well 1 and the well casing 2 are An annular heat collecting space in which the indirect heat collecting pipe 3 is installed is formed therebetween.
The heat collecting pipe 3 is formed of a SUS pipe, a copper pipe, a polyethylene pipe, a polybden pipe, a VP pipe, etc., and as shown in the longitudinal sectional view of FIG. Straightly to the bottom of the well, protruding across the well casing 2 in the vicinity of the well casing 2 and projecting to the opposite side. A plurality of sets of heat collecting pipes 3 in which the pipes 3 are moved forward and return at substantially equal intervals are installed.
In addition, below the heat collecting pipe 3 at the bottom of the well, rapili (volcanic gravel) is filled to form a rapili layer 4.
As shown in the enlarged cross-sectional view of FIG. 3, the inner peripheral wall portion of the excavation well 1 is filled with rapili (volcanic gravel), and the nonwoven fabric 5 for preventing fine sand inflow is provided inside the rapili layer 4. The groundwater is formed so as to penetrate into the well 1.
Further, the fine sand inflow preventing nonwoven fabric 5 is disposed around the outer periphery of the heat collecting pipe 3, and the gap between the heat collecting pipes 3 is filled with a heat exchange promoting filter layer 6 such as a polyethylene filter. Is efficiently transferred from the heat exchange promoting filter layer 6 to the heat collecting pipe 3.
The heat exchange promoting filter layer 6 is not limited to a polyethylene filter, but may be a rapili layer 4 filled with rapili (volcanic gravel).

前記井戸ケーシング２はＶＰ管から形成され、周囲に集水用孔７が多数個貫通されており、地下水が前記井戸ケーシング２内に浸透し、後述の井戸ポンプ８により地下水を地表に揚水できるようにしている。前記井戸ケーシング２の内部には、地表から揚水管９により吊り下げた水中ポンプ、汲み上げジェットポンプ、エアーポンプ等の井戸ポンプ８が少なくとも帯水層レベル以下に位置する部分に設けられる。
また、前記井戸ケーシング２内部には、サーモスタット１０を適宜個数配置し、サーモスタット１０により水温を連続管理している。間接方式の集熱パイプ３で集熱されたブライン（循環水）の温度が所定の温度（０℃）以下になるような場合は、井戸ポンプ８により井戸周囲の地下水を汲み上げることにより集熱パイプ３の周囲の温度を上昇させる。 The well casing 2 is formed of a VP pipe, and a large number of water collecting holes 7 are formed therethrough so that groundwater can penetrate into the well casing 2 and can be pumped to the ground surface by a well pump 8 described later. I have to. Inside the well casing 2, a well pump 8 such as a submersible pump, a pumping jet pump, an air pump or the like suspended from a ground surface by a pumping pipe 9 is provided at least at a portion below the aquifer level.
Further, an appropriate number of thermostats 10 are arranged inside the well casing 2, and the water temperature is continuously managed by the thermostat 10. When the temperature of the brine (circulated water) collected by the indirect heat collecting pipe 3 is lower than a predetermined temperature (0 ° C.), the ground water around the well is pumped up by the well pump 8 to collect the heat collecting pipe. Increase ambient temperature of 3.

地上には、地中熱利用ヒートポンプ装置を配置し、該地中熱利用ヒートポンプ装置はコンプレッサー１１、蒸発器１２、膨張弁１３、空気式コンデンサー１４及び水式コンデンサー１５から構成される。
一方、地表の掘削井戸１周囲には、集熱パイプ３の往きヘッダー１６及び戻りヘッダー１７を設け、該戻りヘッダー１７から配管を介して地中熱集熱用循環ポンプ１８→熱源水昇温用プレート式熱交換器１９→水式コンデンサー１５（前記地中熱利用ヒートポンプ装置）→往きヘッダー１６→集熱パイプ３（地下熱井戸）→戻りヘッダー１７と循環させ、集熱パイプ３により集熱した地下水熱を地中熱利用ヒートポンプ装置の水式コンデンサー１５の熱源に利用する。
また、前記井戸ポンプ８からの揚水は、揚水管９から前記熱源水昇温用プレート式熱交換器１９へ供給され、前記集熱パイプ３のブラインと熱交換されて、自然放流又は還流される。 A ground heat heat pump device is disposed on the ground, and the ground heat heat pump device includes a compressor 11, an evaporator 12, an expansion valve 13, a pneumatic condenser 14, and a water condenser 15.
On the other hand, a forward header 16 and a return header 17 of the heat collecting pipe 3 are provided around the excavation well 1 on the ground surface, and a ground heat collecting circulation pump 18 is connected from the return header 17 via a pipe to heat source water temperature rising. Plate-type heat exchanger 19 → water condenser 15 (the above-mentioned heat pump using geothermal heat) → forward header 16 → heat collecting pipe 3 (underground heat well) → return header 17 circulates and heat is collected by heat collecting pipe 3 Groundwater heat is used as a heat source for the water condenser 15 of the heat pump device using underground heat.
Further, the pumped water from the well pump 8 is supplied from the pumping pipe 9 to the plate heat exchanger 19 for raising the temperature of the heat source water, and is heat-exchanged with the brine of the heat collecting pipe 3 to be naturally discharged or refluxed. .

次に、本発明の地中熱井戸の高効率な集熱システムの動作操作を添付図面に基づいて、以下に説明する。
図１に示すように、帯水層からの地下水は掘削井戸１、ラピリ層４、細砂流入防止用不織布５を経て集熱空間内へ流入浸透し、地中熱井戸は掘削井戸１と井戸ケーシング２との円環状の集熱空間に地下水を貯水しており、間接方式の集熱パイプ３の周囲には熱交換促進用フィルター層６が充填され、地中熱を効率的に前記熱交換促進用フィルター６層から集熱パイプ３へ伝熱する。
地上の地中熱集熱用循環ポンプ１８を駆動すると、集熱パイプ３に充填されているブライン（循環水）が集熱パイプ３→戻りヘッダー１７→地中熱集熱用循環ポンプ１８→熱源水昇温用プレート式熱交換器１９→水式コンデンサー１５（前記地中熱利用ヒートポンプ装置）→往きヘッダー１６→集熱パイプ３と循環し、地中熱を地中熱利用ヒートポンプ装置の水式コンデンサー１５の熱源に間接方式で利用させる。
そして、間接方式の集熱パイプ３で集熱されたブライン（循環水）の温度が所定の温度（０℃）以下になるような場合は、井戸ポンプ８により井戸周囲の地下水を汲み上げることにより、帯水層より新たに地下水を供給して集熱パイプ３の周囲の温度を上昇させる。
さらに、井戸ポンプ８により汲み上げた地下水は熱源水昇温用プレート式熱交換器１９を介してブライン（循環水）の温度が所定の温度（＋８℃）以上になるように地下水熱をサーモスタット１０により連続管理している。 Next, the operation of the highly efficient heat collecting system for the underground heat well according to the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, groundwater from the aquifer flows into the heat collection space through the drilling well 1, the rapili layer 4, and the fine sand inflow preventing nonwoven fabric 5, and the underground heat well is the drilling well 1 and the well. Groundwater is stored in an annular heat collecting space with the casing 2, and a heat exchange promoting filter layer 6 is filled around the indirect heat collecting pipe 3 so that the heat is efficiently exchanged with the ground heat. Heat is transferred from the 6 layers of the filter for promotion to the heat collecting pipe 3.
When the ground heat collecting circulation pump 18 on the ground is driven, the brine (circulating water) filled in the heat collecting pipe 3 becomes the heat collecting pipe 3 → the return header 17 → the ground heat collecting circulation pump 18 → the heat source. Plate heat exchanger 19 for water temperature rising → Water condenser 15 (the above-mentioned heat pump device using geothermal heat) → Outward header 16 → Heat collecting pipe 3 circulates, and the geothermal heat of the heat pump device using geothermal heat The heat source of the condenser 15 is used in an indirect manner.
And when the temperature of the brine (circulated water) collected by the indirect heat collecting pipe 3 is lower than the predetermined temperature (0 ° C.), by pumping up the groundwater around the well by the well pump 8, Groundwater is newly supplied from the aquifer to raise the temperature around the heat collecting pipe 3.
Further, the groundwater pumped up by the well pump 8 is supplied to the thermostat 10 through the plate heat exchanger 19 for raising the temperature of the heat source water so that the temperature of the brine (circulated water) becomes a predetermined temperature (+ 8 ° C.) or higher. Continuous management.

本発明の地中熱井戸の高効率な集熱システムの概略系統図である。It is a schematic system diagram of the highly efficient heat collection system of the underground heat well of this invention. 本発明の地中熱井戸の縦断面図である。It is a longitudinal cross-sectional view of the geothermal well of this invention. 本発明の地中熱井戸の拡大横断面図である。It is an expansion cross-sectional view of the geothermal well of the present invention.

符号の説明Explanation of symbols

１ 掘削井戸
２ 井戸ケーシング
３ 集熱パイプ
４ ラピリ層
５ 細砂流入防止用不織布
６ 熱交換用フィルター層
７ 集水用孔
８ 井戸ポンプ
９ 揚水管
１０ サーモスタット
１１ コンプレッサー
１２ 蒸発器
１３ 膨張弁
１４ 空気式コンデンサー
１５ 水式コンデンサー
１６ 往きヘッダー
１７ 戻りヘッダー
１８ 地中熱集熱用循環ポンプ
１９ 熱源水昇温用プレート式熱交換器 DESCRIPTION OF SYMBOLS 1 Drilling well 2 Well casing 3 Heat collecting pipe 4 Lapyri layer 5 Non-woven fabric for preventing fine sand inflow 6 Heat exchange filter layer 7 Water collecting hole 8 Well pump 9 Pumping pipe 10 Thermostat 11 Compressor 12 Evaporator 13 Expansion valve 14 Pneumatic type Condenser 15 Water type condenser 16 Outgoing header 17 Return header 18 Geothermal heat collection circulation pump 19 Plate type heat exchanger for heat source water temperature rise

Claims (4)

地表から帯水層に達する所定深さまでボーリングにより所定口径の円形断面の掘削孔を掘削して掘削井戸とし、該掘削井戸内には、上下が開口した筒状の井戸ケージングを上部開口が地表で下部開口が井戸底部に位置するように同心円状に設け、前記掘削井戸と前記井戸ケーシングとの間には間接方式の集熱パイプが設置される円環状の集熱空間が形成され、前記掘削井戸の内壁にはラピリ層、細砂流入防止用不織布を設けて帯水層の地下水のみが前記集熱空間内に浸透するように形成し、前記集熱パイプはブラインを循環させ、前記集熱空間を縦断するように地表から井戸底部へ直線的に向かい、井戸底部付近で井戸ケーシングを横断して反対側に突き出し、さらに前記集熱空間を井戸底部付近から地表に直線的に向かう往き及び戻りのＵ字状に略等間隔に複数組設置され、前記井戸ケーシングの内部には、地表から揚水管により吊り下げた井戸ポンプが少なくとも帯水層レベル以下に位置する部分に設けられ、一方、地表の地中熱井戸周囲には、集熱パイプの往きヘッダー及び戻りヘッダーを設け、該戻りヘッダーから配管を介して地中熱利用ヒートポンプ装置の水式コンデンサーから往きヘッダーへ循環させ、前記集熱パイプにより集熱した地下水熱を地中熱利用ヒートポンプ装置の水式コンデンサーの熱源に利用することを特徴とする地中熱井戸の高効率な集熱システム。   Drilling a drill hole with a circular cross section with a predetermined diameter by boring to a predetermined depth reaching the aquifer from the surface of the earth to form a drilling well. An annular heat collecting space in which an indirect heat collecting pipe is installed is formed between the drilling well and the well casing so that a lower opening is located at the bottom of the well, and the drilling well is formed. The inner wall is provided with a lapi layer and a nonwoven fabric for preventing fine sand inflow so that only the groundwater of the aquifer permeates into the heat collecting space, the heat collecting pipe circulates brine, and the heat collecting space It goes straight from the surface to the bottom of the well so that it crosses the top of the well, protrudes to the opposite side across the well casing near the bottom of the well, and further, the heat collecting space goes straight from the bottom of the well to the surface of the well. U In the well casing, a well pump suspended from a ground surface by a pumping pipe is provided at a portion located at least below the aquifer level, while on the other hand, Around the heat well, there is a return header and return header for the heat collection pipe, and the return header is circulated from the return condenser to the return header from the water condenser of the underground heat pump using the heat collection pipe. A high-efficiency heat collection system for geothermal wells that uses groundwater heat as a heat source for the water condenser of a heat pump that uses geothermal heat. 前記戻りヘッダーと地中熱利用ヒートポンプ装置の水式コンデンサーとの途中に熱源水昇温用プレート式熱交換器を設け、井戸ポンプからの地下水が揚水管から前記熱源水昇温用プレート式熱交換器へ供給され、前記集熱パイプのブラインと熱交換されて地中熱利用ヒートポンプ装置の水式コンデンサーの熱源に利用され、自然放流又は還流されることを特徴とする請求項１記載の地中熱井戸の高効率な集熱システム。   A plate-type heat exchanger for raising the temperature of the heat source water is provided in the middle of the return header and the water-type condenser of the heat pump device using underground heat, and the plate-type heat exchange for raising the temperature of the heat source water from the pumping pipe through the groundwater from the well pump. 2. The underground of claim 1, wherein the water is supplied to a heat exchanger, is heat-exchanged with a brine of the heat collecting pipe, is used as a heat source of a water condenser of a geothermal heat pump device, and is naturally discharged or refluxed. Highly efficient heat collection system for heat wells. 前記集熱空間の前記集熱パイプの周囲には、熱交換促進用フィルター層が充填され、地下水熱を効率的に前記熱交換促進用フィルター層から集熱パイプへ伝熱することができることを特徴とする請求項１記載の地中熱井戸の高効率な集熱システム。   A heat exchange promoting filter layer is filled around the heat collecting pipe in the heat collecting space, and groundwater heat can be efficiently transferred from the heat exchange promoting filter layer to the heat collecting pipe. The highly efficient heat collection system of a geothermal well according to claim 1. 前記井戸ケーシング内部には、サーモスタットを上下に適宜個数配置し、間接方式の集熱パイプで集熱されたブラインの温度が所定の温度以下になるような場合は、井戸ポンプにより井戸周囲の地下水を汲み上げることにより集熱パイプの周囲の温度を上昇させることができることを特徴とする請求項１記載の地中熱井戸の高効率な集熱システム。   Inside the well casing, an appropriate number of thermostats are arranged up and down, and when the temperature of the brine collected by the indirect heat collecting pipe is below a predetermined temperature, the groundwater around the well is drained by a well pump. 2. A highly efficient heat collecting system for underground heat wells according to claim 1, wherein the temperature around the heat collecting pipe can be raised by pumping.
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