CA1187480A - Insulating tube for geothermal well intended to reduce the loss of heat - Google Patents
Insulating tube for geothermal well intended to reduce the loss of heatInfo
- Publication number
- CA1187480A CA1187480A CA000393964A CA393964A CA1187480A CA 1187480 A CA1187480 A CA 1187480A CA 000393964 A CA000393964 A CA 000393964A CA 393964 A CA393964 A CA 393964A CA 1187480 A CA1187480 A CA 1187480A
- Authority
- CA
- Canada
- Prior art keywords
- heat
- pipes
- transporting liquid
- pipe
- lower ends
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/40—Geothermal collectors operated without external energy sources, e.g. using thermosiphonic circulation or heat pipes
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- 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)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Cleaning Of Streets, Tracks, Or Beaches (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The invention provides an apparatus for the recovery of geothermal energy. The apparatus comprises a first conduit which is inserted into a borehole in the ground so as to be in thermal contact therewith and a second conduit associated with the first conduit which is also inserted into the borehole. The second conduit is thermally insulated from the first conduit at least along the major portion of its length and the first and second conduits have upper ends providing respectively an inlet and outlet for a heat-transporting medium and lower ends which are closed to the borehole and in communication with each other to provide a closed path for the heat-transporting medium from the inlet to the outlet. The heat-transporting medium extracts heat from the ground during its passage down the first conduit and rises to the surface through the second conduit at least partly under the effect of the thermosiphon produced as a result of the heating of the heat-transporting medium during its passage down the first conduit.
The invention provides an apparatus for the recovery of geothermal energy. The apparatus comprises a first conduit which is inserted into a borehole in the ground so as to be in thermal contact therewith and a second conduit associated with the first conduit which is also inserted into the borehole. The second conduit is thermally insulated from the first conduit at least along the major portion of its length and the first and second conduits have upper ends providing respectively an inlet and outlet for a heat-transporting medium and lower ends which are closed to the borehole and in communication with each other to provide a closed path for the heat-transporting medium from the inlet to the outlet. The heat-transporting medium extracts heat from the ground during its passage down the first conduit and rises to the surface through the second conduit at least partly under the effect of the thermosiphon produced as a result of the heating of the heat-transporting medium during its passage down the first conduit.
Description
7~B~
This invention relates to an apparatus for the recovery of geothermal energy from the ground.
~ eothermal energy provides a useful alternative enel-gy source but in the past its use has been limited on accoln~t of the lil-nited availability of suitable sites.
Current geothermal power plants rely on the generation of stearn at high temperatures in thermally active region of the erth's surface. For example, one of the better known ~eothermal power plants is at Waikari in New Zealand where aquifers containing water up to and exceeding a temperature of 300 degrees centigrade exist. In some countries, such as Iceland, geothermal energy is used for space heating but only because hot fluids, ranging in temperature from about 60 degrces centigrade to about 150 degrees centigrade are Eound relatively near the surface.
The rate of conduction of heat outward from the interior of the earth averages 1.5 calories per centimeter per second. Over a one-year period, this flux to the eartll's surface amounts to over 10 calories. Even at places which are not known for their thermal activity the temperature increases ~uite rapidly with depth. One problem with the recovery of geothermal energy at such places has been that the cost of extracting the energy has rendered the process uneconomic. Although in most areas the cost of drilling a borehole to a depth where the ground temperature reaches, for example, about 60 de(3rees celltigrade is relatively acceptable on a one-off basis, no satisfactory means exists for recoverin(3 the heat without expending substantial amounts of energy. For example, one method descr;bed in sritish patent speciEication number 2 016 139 published on September 19, 19 9, involves pumping liquid into the ground so that it becomes heated by geothermal energy and returning i-t to the surface where the heat is recovered in a heat exchanger. A problem with this system is that a relatively large amount of energy is required to pump the liquid through the system. Another method involves pumping warm water up to the surface from the water table and extracting heat from this ground water before returning it to the ground. This also requires substantial amounts of energy.
An object of the present invention is to provide an apparatus for recovering geothermal energy which minimizes the ex-ternal energy requirements.
Accordingly, a first aspect of the invention provides a geothermal energy recovery assembly for inser-tion into the casing of a well, comprising outer, interme~
diate, and inner concentric pipes having upper and lower ends, a feed channel for a heat-transporting liquid defined between the outer pipe and the intermediate pipe, and a return channel defined within the inner pipe, first spacer means maintaining said pipes in mutually spaced relationship, second spacer means for maintaining said outer pipe in spacéd relationship with the casing of the well, insulation means filling a space defined between said intermediate and inner pipes, common plate means closing off the lower ends of said pipes, radial connecting channels extending betweenthe inner and ou-ter pipes only adjacent said lower ends, an inlet from the heat-transporting liquid defined between the intermediate pipe and the outer pipe at the upper ends -thereof, ~o'Y
t~J and an outlet ~æ~m said heat-transporting liquid defined at the upper end of the inner pipe, whereby, in use heat-transporting llquid flows down the Eeed channel and back up the return channel under ~he action of the thermosiphon effect produced as a result of geothermal heating of the heat-transporting liquid.
A Eurther aspect of the invention provides a me-thod oE recovering geothermal energy, comprising sinking a well, inserting in said well an assembly comprising outer, intermediate, and inner concentric pipes having upper and lower ends, a feed channel for a heat-transport-ing liquid between the outer pipe and the intermediatepipe, and a return channel defined within the inner pipe, first spacer means maintaining said pipes in mutually spaced relationship, second spacer means for maintaining said outer pipe in spaced relationship with the wall oE the well, insulation means filling a space defined between said intermediate and inner pipes, common plate means closing off lower ends of said pipes, radial connect-ing channels extending between the inner and outer pipes only adjacent said lower ends, an inlet from the heat-transporting liquid defined between the intermed.iate pipe and the outer pipe at the upper ends thereof, and an outlet for said heat-transporting liquid defined at the upper end of the inner pipe, supplying heat-tran-porting liquid to the inlet such that i.t flows down the feed channel and back up the return channel under the action of the thermosiphon effect produced as a result of geothermal heating of the heat-transporting liquid in the feed channel, and extracting heat from the heat-transporting liquid as it emerges from said outlet By creating a thermosiphon, the fluid can be brought to the surface under substantial pressure and this avoids the need for external pumps or at least si-gnificantly reduces their power requirement.
The invention will no~ be described in more dctail, by way oE example only, with reference to the accompanying drawings, in which:-Figllre 1 is a longitu(1inal section through aborehole into which is inserted apparatus Eor the recovery oE ~eothermal energy according to the invention; and Figure 2 is a section taken along line A-A of Figure 1.
The borehole shown in Figure 1 is lined with a convent;ollal casing l. Into the borehole is inserted the apparatus comprising three concentric tubes, namely an outer tube 2, an intermediate tube 3 and an inner tube 6 closed at their lower ends by means of a common plate 12. Between the outer tube 2 and the intermediate tube 3 is defined a space 7 forming a first conduit down which a heat-transporting medium flows, The gap between the intermediate tube 3 and the inner tube 6 is filled with an insulating material 4 whicll thermally insulates the space 7 from the interior 5 of the inner tube which defines a second conduit up which the heated medium flows. The insualting material 4 may, for example, be expanded glass, plastic or fibre glass insulation. At the lower end of the inner tube 6 are formed radially extending passages 11 which extend through the insulating material and establish communication between the first and secon conduits and thus provide a closed flow path between an inlet and outlet at the upper end of the apparatus. The concentric tubes 2,3 and 6 are lleld in proper spaced relationship by mealls of radially extendillg spacer members 9, 10. The outer tuhe 2 is spaced from the borellole casin~ by means of the spacer mernbers 8 which are '7i~
aligned with the spacer members 9, 10. The spacer members may be ln the forrn of protruberances integral with the respective tubes or may be in the form of separate wedge melnbers .
The borehole is drilled deep enough into the ~round for the temperature to rise to a convenient level, for example, 60 degrees centigrade. The actual depth of the hole will obviously depend on the locatlon and the temperature it is desired to heat the heat-transporting medium to for the particular application in hand. The borehole is normally drilled into the water table although this is of course not essential since heat can equally well be extracted from dry rock. Heat-transportin~ fluid, which preferably should be a substance such as oil which has a high specific heat for maximum efficiency althou~h water may also employed, is supplied to the inlet of the apparatus at the upper end o~ the space 7 for-ning the first conduit. The fluid flows down the gap between the intermediate tube 3 and the outer tube 2 which is heat-conducting and in thermal contact with the groung surrounding the borehole. In the example shown, the borehole extends into the water table and the warm ground water fills the gap between the casillg 1 and the outer tube 2 of the apparatus. If the borehole is dry, a suitable heat-conducting rnedium can be inserted into this qap to ensure good thermal contact.
The heat-transporting fluid flows down the first conduit and is heated as it does so by heat From the surrounding wqarrn ground water. On reaching the pas~a~;es 11 at the foot of the apparatus, the heat-transporting Eluid is diverted into the interior of the inner tube 6 where it '7~
flows up to the surface carrying the heat energy extracted from the groulld water with it. Owing to the presence of the insulating material 4 the heated fluid rising up the interior 5 of the inner tube 6 is not in thermal contact with the down-flowing fluid in the space 7 and accordingly does not lose heat energy to it As a result a thermal siphon is established which tends to circulate the heated fluid up the inner tube 6 and eject it under pressure.
The outflowing heated fluid can then be used as desired. For example, it can suitably be used for community space heating, in which case it can be fed by pipe-line to radiators in heated buildings. The thermosiphon effect can be used to drive the fluid through the ssystem al~hough it can be supplemented if necessary by the use of pumps. In this case, the power requirement of the pumps is of course greatly as compared with the prior art. After yiving up its heat the fluid is returned to he inlet of the apparatus so as to from a closed circulatory system.
The heated fluid need not be passed directly to the ultimate user but insated can, if desired, be passed through a heat exchanger where it gives up its heat to a secondary fluid.
As will be apparent, the described apparatus enables lleat energy to be extractecl from the ground or water table without the need for pumps, or at least enables the pumping power to be substantailly reduced. /rhe heate(3 fluid ernerges at the outlet uncler substantial pressure owing the thermal siphon effect pro(3uced by the presence of the down-flowing column of cooler fluid insulated from t:he up-flowing column of heated fluid. By employing a fluid ~'7~
with a hi~h specific heat, the required flow rate for a ~Lven heat output, or alternatively the overall diameter of e tubes can be minim~ed.
rrhe apparatus is substantially pollution free and it does not deplete the water table Not only does the presence of the insulation between the feed and return lines give rise to the thermosiphon effect, it also increases eEiciency by preventing the down-flowing fluid from beinq partially warmed by the heated up-flowing fluid. Such heating reduces the temperature difference between the down-flowing fluid and the surrounding qround and therefore reduces the efflciency of heat transfer.
Also it is generally only necessary to drill one hole for each application unlike the system involving pumping water out of the water table where at least two holes were generally required.
This invention relates to an apparatus for the recovery of geothermal energy from the ground.
~ eothermal energy provides a useful alternative enel-gy source but in the past its use has been limited on accoln~t of the lil-nited availability of suitable sites.
Current geothermal power plants rely on the generation of stearn at high temperatures in thermally active region of the erth's surface. For example, one of the better known ~eothermal power plants is at Waikari in New Zealand where aquifers containing water up to and exceeding a temperature of 300 degrees centigrade exist. In some countries, such as Iceland, geothermal energy is used for space heating but only because hot fluids, ranging in temperature from about 60 degrces centigrade to about 150 degrees centigrade are Eound relatively near the surface.
The rate of conduction of heat outward from the interior of the earth averages 1.5 calories per centimeter per second. Over a one-year period, this flux to the eartll's surface amounts to over 10 calories. Even at places which are not known for their thermal activity the temperature increases ~uite rapidly with depth. One problem with the recovery of geothermal energy at such places has been that the cost of extracting the energy has rendered the process uneconomic. Although in most areas the cost of drilling a borehole to a depth where the ground temperature reaches, for example, about 60 de(3rees celltigrade is relatively acceptable on a one-off basis, no satisfactory means exists for recoverin(3 the heat without expending substantial amounts of energy. For example, one method descr;bed in sritish patent speciEication number 2 016 139 published on September 19, 19 9, involves pumping liquid into the ground so that it becomes heated by geothermal energy and returning i-t to the surface where the heat is recovered in a heat exchanger. A problem with this system is that a relatively large amount of energy is required to pump the liquid through the system. Another method involves pumping warm water up to the surface from the water table and extracting heat from this ground water before returning it to the ground. This also requires substantial amounts of energy.
An object of the present invention is to provide an apparatus for recovering geothermal energy which minimizes the ex-ternal energy requirements.
Accordingly, a first aspect of the invention provides a geothermal energy recovery assembly for inser-tion into the casing of a well, comprising outer, interme~
diate, and inner concentric pipes having upper and lower ends, a feed channel for a heat-transporting liquid defined between the outer pipe and the intermediate pipe, and a return channel defined within the inner pipe, first spacer means maintaining said pipes in mutually spaced relationship, second spacer means for maintaining said outer pipe in spacéd relationship with the casing of the well, insulation means filling a space defined between said intermediate and inner pipes, common plate means closing off the lower ends of said pipes, radial connecting channels extending betweenthe inner and ou-ter pipes only adjacent said lower ends, an inlet from the heat-transporting liquid defined between the intermediate pipe and the outer pipe at the upper ends -thereof, ~o'Y
t~J and an outlet ~æ~m said heat-transporting liquid defined at the upper end of the inner pipe, whereby, in use heat-transporting llquid flows down the Eeed channel and back up the return channel under ~he action of the thermosiphon effect produced as a result of geothermal heating of the heat-transporting liquid.
A Eurther aspect of the invention provides a me-thod oE recovering geothermal energy, comprising sinking a well, inserting in said well an assembly comprising outer, intermediate, and inner concentric pipes having upper and lower ends, a feed channel for a heat-transport-ing liquid between the outer pipe and the intermediatepipe, and a return channel defined within the inner pipe, first spacer means maintaining said pipes in mutually spaced relationship, second spacer means for maintaining said outer pipe in spaced relationship with the wall oE the well, insulation means filling a space defined between said intermediate and inner pipes, common plate means closing off lower ends of said pipes, radial connect-ing channels extending between the inner and outer pipes only adjacent said lower ends, an inlet from the heat-transporting liquid defined between the intermed.iate pipe and the outer pipe at the upper ends thereof, and an outlet for said heat-transporting liquid defined at the upper end of the inner pipe, supplying heat-tran-porting liquid to the inlet such that i.t flows down the feed channel and back up the return channel under the action of the thermosiphon effect produced as a result of geothermal heating of the heat-transporting liquid in the feed channel, and extracting heat from the heat-transporting liquid as it emerges from said outlet By creating a thermosiphon, the fluid can be brought to the surface under substantial pressure and this avoids the need for external pumps or at least si-gnificantly reduces their power requirement.
The invention will no~ be described in more dctail, by way oE example only, with reference to the accompanying drawings, in which:-Figllre 1 is a longitu(1inal section through aborehole into which is inserted apparatus Eor the recovery oE ~eothermal energy according to the invention; and Figure 2 is a section taken along line A-A of Figure 1.
The borehole shown in Figure 1 is lined with a convent;ollal casing l. Into the borehole is inserted the apparatus comprising three concentric tubes, namely an outer tube 2, an intermediate tube 3 and an inner tube 6 closed at their lower ends by means of a common plate 12. Between the outer tube 2 and the intermediate tube 3 is defined a space 7 forming a first conduit down which a heat-transporting medium flows, The gap between the intermediate tube 3 and the inner tube 6 is filled with an insulating material 4 whicll thermally insulates the space 7 from the interior 5 of the inner tube which defines a second conduit up which the heated medium flows. The insualting material 4 may, for example, be expanded glass, plastic or fibre glass insulation. At the lower end of the inner tube 6 are formed radially extending passages 11 which extend through the insulating material and establish communication between the first and secon conduits and thus provide a closed flow path between an inlet and outlet at the upper end of the apparatus. The concentric tubes 2,3 and 6 are lleld in proper spaced relationship by mealls of radially extendillg spacer members 9, 10. The outer tuhe 2 is spaced from the borellole casin~ by means of the spacer mernbers 8 which are '7i~
aligned with the spacer members 9, 10. The spacer members may be ln the forrn of protruberances integral with the respective tubes or may be in the form of separate wedge melnbers .
The borehole is drilled deep enough into the ~round for the temperature to rise to a convenient level, for example, 60 degrees centigrade. The actual depth of the hole will obviously depend on the locatlon and the temperature it is desired to heat the heat-transporting medium to for the particular application in hand. The borehole is normally drilled into the water table although this is of course not essential since heat can equally well be extracted from dry rock. Heat-transportin~ fluid, which preferably should be a substance such as oil which has a high specific heat for maximum efficiency althou~h water may also employed, is supplied to the inlet of the apparatus at the upper end o~ the space 7 for-ning the first conduit. The fluid flows down the gap between the intermediate tube 3 and the outer tube 2 which is heat-conducting and in thermal contact with the groung surrounding the borehole. In the example shown, the borehole extends into the water table and the warm ground water fills the gap between the casillg 1 and the outer tube 2 of the apparatus. If the borehole is dry, a suitable heat-conducting rnedium can be inserted into this qap to ensure good thermal contact.
The heat-transporting fluid flows down the first conduit and is heated as it does so by heat From the surrounding wqarrn ground water. On reaching the pas~a~;es 11 at the foot of the apparatus, the heat-transporting Eluid is diverted into the interior of the inner tube 6 where it '7~
flows up to the surface carrying the heat energy extracted from the groulld water with it. Owing to the presence of the insulating material 4 the heated fluid rising up the interior 5 of the inner tube 6 is not in thermal contact with the down-flowing fluid in the space 7 and accordingly does not lose heat energy to it As a result a thermal siphon is established which tends to circulate the heated fluid up the inner tube 6 and eject it under pressure.
The outflowing heated fluid can then be used as desired. For example, it can suitably be used for community space heating, in which case it can be fed by pipe-line to radiators in heated buildings. The thermosiphon effect can be used to drive the fluid through the ssystem al~hough it can be supplemented if necessary by the use of pumps. In this case, the power requirement of the pumps is of course greatly as compared with the prior art. After yiving up its heat the fluid is returned to he inlet of the apparatus so as to from a closed circulatory system.
The heated fluid need not be passed directly to the ultimate user but insated can, if desired, be passed through a heat exchanger where it gives up its heat to a secondary fluid.
As will be apparent, the described apparatus enables lleat energy to be extractecl from the ground or water table without the need for pumps, or at least enables the pumping power to be substantailly reduced. /rhe heate(3 fluid ernerges at the outlet uncler substantial pressure owing the thermal siphon effect pro(3uced by the presence of the down-flowing column of cooler fluid insulated from t:he up-flowing column of heated fluid. By employing a fluid ~'7~
with a hi~h specific heat, the required flow rate for a ~Lven heat output, or alternatively the overall diameter of e tubes can be minim~ed.
rrhe apparatus is substantially pollution free and it does not deplete the water table Not only does the presence of the insulation between the feed and return lines give rise to the thermosiphon effect, it also increases eEiciency by preventing the down-flowing fluid from beinq partially warmed by the heated up-flowing fluid. Such heating reduces the temperature difference between the down-flowing fluid and the surrounding qround and therefore reduces the efflciency of heat transfer.
Also it is generally only necessary to drill one hole for each application unlike the system involving pumping water out of the water table where at least two holes were generally required.
Claims (6)
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED
AS FOLLOWS:
1. A geothermal energy recovery assembly for in-sertion into the casing of a well, comprising outer, intermediate, and inner concentric pipes having upper and lower ends, a feed channel for a heat-transporting liquid defined between the outer pipe and the intermediate pipe, and a return channel defined within the inner pipe, first spacer means maintaining said pipes in mutually spaced relationship, second spacer means for maintaining said outer pipe in spaced relationship with the casing of the well, insulation means filling a space defined between said intermediate and inner pipes, common plate means closing off the lower ends of said pipes, radial connecting channels extending between the inner and outer pipes only adjacent said lower ends, an inlet from the heat-transporting liquid defined between the intermediate pipe and the outer pipe at the upper ends thereof, and an outlet for said heat-transporting liquid defined at the upper end of the inner pipe, whereby, in use heat-transporting liquid flows down the feed channel and back up the return channel under the action of the thermosiphon effect produced as a result of geothermal heating of the heat-transporting liquid.
2. An assembly as claimed in claim 1, wherein said insulation is expanded glass.
3. An assembly as claimed in claim 1, wherein said insulation is plastic.
4. An assembly as claimed in claim 1, wherein said insulation is fibre glass.
5. A method of recovering geothermal energy, comprising sinking a well, inserting in said well an assembly comprising outer, intermediate, and inner concen-tric pipes having upper and lower ends, a feed channel for a heat-transporting liquid defined between the outer pipe and the intermediate pipe, and a return channel defined within the inner pipe, first spacer means maintain-ing said pipes in mutually spaced relationship, second spacer means for maintaining said outer pipe in spaced relationship with the wall of the well, insulation means filling a spaced defined between said intermediate and inner pipes, common plate means closing off lower ends of said pipes, radial connecting channels extending between the inner and outer pipes only adjacent said lower ends, an inlet from the heat-transporting liquid defined between the intermediate pipe and the outer pipe at the upper ends thereof, and an outlet for said heat-transporting liquid defined at the upper end of the inner pipe, supplying heat-transporting liquid to the inlet such that it flows down the feed channel and back up the return channel under the action of the thermo-siphon effect produced as a result of geothermal heating of the heat-transporting liquid in the feed channel, and extracting heat from the heat-transporting liquid as it emerges from said outlet.
6. A method as claimed in claim 5, wherein the heat-transporting liquid energizing from said outlet is looped back to said inlet.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR81.01010 | 1981-01-16 | ||
| FR8101010A FR2498307B1 (en) | 1981-01-16 | 1981-01-16 | INSULATING TUBE FOR GEOTHERMAL DRILLING WHICH INCREASES THE YIELD OF CALORIE RECOVERY |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1187480A true CA1187480A (en) | 1985-05-21 |
Family
ID=9254337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000393964A Expired CA1187480A (en) | 1981-01-16 | 1982-01-12 | Insulating tube for geothermal well intended to reduce the loss of heat |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE891969A (en) |
| CA (1) | CA1187480A (en) |
| DE (1) | DE3200971A1 (en) |
| FR (1) | FR2498307B1 (en) |
| IT (1) | IT1149420B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008122114A2 (en) * | 2007-04-04 | 2008-10-16 | Bardsley James E | Coaxial borehole energy exchange system for storing and extracting underground cold |
| WO2020152485A1 (en) * | 2019-01-22 | 2020-07-30 | Geomax Project Kft. | Geothermal well, method of establishing thereof and method for geothermal energy production |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62133287A (en) * | 1985-12-03 | 1987-06-16 | 日本オイルエンジニアリング株式会社 | Method and device for sampling geothermal fluid |
| EP1181433B1 (en) * | 1999-05-28 | 2005-11-23 | Achim Limbeck | Drill, drilling method and extraction of hot water |
| NL1035587C2 (en) * | 2008-06-16 | 2009-12-18 | Demar Heiwerken B V | Heat exchanger. |
| DE102009011092A1 (en) * | 2009-03-03 | 2010-09-09 | Piper, Erik John William | Environmental heat recovery system for absorbing and utilizing thermal energy from environmental heat in e.g. soil, has heat recovery probe, where heat transfer liquid flows back into gap under admission of heat from environment of probe |
| SE537413C2 (en) * | 2012-12-06 | 2015-04-21 | Triopipe Geotherm Ab | Coaxial borehole heat exchanger and process for making it |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1569645A (en) * | 1968-01-03 | 1969-06-06 | ||
| SU322084A1 (en) * | 1970-03-23 | 1973-10-26 | DEVICE FOR EXTRACTION OF GEOTHERMAL ENERGY | |
| US4116275A (en) * | 1977-03-14 | 1978-09-26 | Exxon Production Research Company | Recovery of hydrocarbons by in situ thermal extraction |
| JPS5452349A (en) * | 1977-09-30 | 1979-04-24 | Ushio Nagase | Natural steam power application system |
| DE2927222A1 (en) * | 1979-07-03 | 1981-01-08 | Gerhard Benens | Geothermal heat recovery system - pumps water down inside borehole casing and up through inner tube after heating |
| LU81670A1 (en) * | 1979-09-10 | 1980-01-24 | Feist Artus | METHOD FOR OBTAINING GROWTH AND DEVICE FOR CARRYING OUT THIS METHOD |
-
1981
- 1981-01-16 FR FR8101010A patent/FR2498307B1/en not_active Expired
-
1982
- 1982-01-07 IT IT19030/82A patent/IT1149420B/en active
- 1982-01-12 CA CA000393964A patent/CA1187480A/en not_active Expired
- 1982-01-14 DE DE19823200971 patent/DE3200971A1/en not_active Ceased
- 1982-02-01 BE BE0/207189A patent/BE891969A/en unknown
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008122114A2 (en) * | 2007-04-04 | 2008-10-16 | Bardsley James E | Coaxial borehole energy exchange system for storing and extracting underground cold |
| WO2008122114A3 (en) * | 2007-04-04 | 2008-12-18 | James E Bardsley | Coaxial borehole energy exchange system for storing and extracting underground cold |
| WO2020152485A1 (en) * | 2019-01-22 | 2020-07-30 | Geomax Project Kft. | Geothermal well, method of establishing thereof and method for geothermal energy production |
| US11655801B2 (en) | 2019-01-22 | 2023-05-23 | Geomax Project Kft. | Geothermal well, method of establishing thereof and method for geothermal energy production |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1149420B (en) | 1986-12-03 |
| FR2498307A1 (en) | 1982-07-23 |
| FR2498307B1 (en) | 1986-11-14 |
| IT8219030A0 (en) | 1982-01-07 |
| DE3200971A1 (en) | 1982-11-04 |
| BE891969A (en) | 1982-05-27 |
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