JP2013234782A - Heat exchange unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchange unit with a simple configuration, which facilitates assembly and exchange to achieve superior mass productivity and maintainability, facilitates making a long product to achieve a superior design flexibility, and in which a heat exchanger is hardly damaged when in construction or the like to achieve superior workability and robustness, and a geothermal heat is effectively utilized to achieve energy saving, environmental protection and efficiency of heat exchange.SOLUTION: A heat exchange unit includes a liquid-permeable cylindrical casing part installed in the earth or liquid, and a heat exchanger inserted into the casing part. The heat exchanger includes: (a) an upper connection member having a heating medium entrance part and a heating medium outlet part; (b) a heat collecting/radiating pipe where the upper end is connected with the heating medium outlet part to flow down the heating medium flowing out from the heating medium outlet part; (c) a lower connection member having a heating medium inlet part where the lower end of the heat collecting/radiating pipe is connected and the heating medium flows in, and a heating medium exit part for gathering and discharging the flow-in heating medium; and (d) a return pipe where the lower end is connected to the heating medium exit part of the lower connection member to reflux the heating medium.

Description

  The present invention relates to a heat exchange unit that performs heat exchange with heat in the ground via a liquid that is buried in the ground or is submerged in the liquid and flows in the ground.

The depth in the ground (for example, a depth of 5 m or more) has a substantially constant temperature throughout the year (for example, 15 ° C.), and has a property that it is colder in summer and warmer than winter. An underground heat exchanger embedded in the ground is known to collect heat from the ground using this property or to dissipate heat to the ground. The underground heat exchanger is connected to a load device such as a heat pump, an air conditioner, or a snow melting device, and a heat medium such as air, water, or antifreeze is circulated between the load devices. The earth heat is used by being taken out.
The applicant of the present application has filed and patented (Patent Document 1), at least a part of which is formed in a spiral shape and arranged in parallel in a plurality of lines, and a spiral flow path through which a heat medium flows, and a lower end spirally. A ground heat medium flow path that is connected to the lower end of the spiral flow path and is surrounded by the spiral flow path and is substantially parallel to the spiral axis of the spiral flow path and has an upper end connected by a header. And a gap holding member that holds the gap between the spiral flow paths, the gap holding member being formed in an annular shape, and a base part into which the underground heat medium flow path is inserted or fitted, and extending to the base part An underground heat exchanger heat exchanger is disclosed that includes an arm portion that is formed and a fitting portion that is formed at an end portion of the arm portion and into which a spiral flow path is fitted.

Japanese Patent No. 4594956

The underground heat exchanger of (Patent Document 1) is necessary to obtain a heat transfer area equivalent to that of the underground heat exchanger having a long (straight pipe) flow path by having a spiral flow path. The length in the vertical direction is shortened to about 1/3 to 1/20, and the depth of buried potholes and the length of excavation grooves can be reduced to about 1/3 to 1/20 of the conventional length. Costs can be significantly reduced, and the amount of excavation is small, excavation workability and workability are excellent, and potholes and excavation grooves can be backfilled with a small amount of filler, making it excellent in backfilling workability and filling. It is not deformed by the pressure of the filler when it is returned, and it is difficult for excessive stress to work locally, so that it is difficult for pitching to occur, it has excellent durability, and the heat medium flow path is evenly arranged in the ground In other words, heat exchange spots were hardly generated, and high heat exchange efficiency could be maintained.
However, it takes time to form a spiral channel and to attach a spacing member, and the length of the spiral channel can be adjusted according to the temperature of the ground where the underground heat exchanger is embedded and the amount of heat required. It is difficult to change, and there is a lack of assembly workability, design flexibility, and versatility, and it has been desired to simplify the shape and improve mass productivity.
In addition, there is a risk of deformation or breakage of the helical flow path or spacing member of the underground heat exchanger during backfilling work such as dredging holes and excavation grooves with fillers, and during excavation work for maintenance. Therefore, improvement in workability and durability was desired.

  The present invention meets the above demands, and can be simplified in configuration, simplified in shape, easily assembled, disassembled and partially replaced, and excellent in mass productivity, maintenance, storage, and transportability. In addition to being easy to lengthen, it is excellent in design flexibility and versatility, and it can protect the heat exchanger reliably, and there is no damage during construction or maintenance. It excels in performance and robustness, shortening the construction period and reducing costs, and exchanging heat through groundwater flowing underground, groundwater accumulated in the ground (well water), hot spring water, oil, and other liquids Accordingly, an object of the present invention is to provide a heat exchange unit that is excellent in heat exchange efficiency, can effectively use heat in the ground, and is excellent in energy saving and environmental protection.

In order to solve the above problems, the heat exchange unit of the present invention has the following configuration.
The heat exchange unit according to claim 1 is a heat exchange unit that performs heat exchange with heat in the ground through a liquid that is buried in the ground or submerged in the liquid and flows in the ground, and is buried in the ground. Or a liquid-permeable cylindrical casing portion set in the liquid, and a heat exchanger inserted in the casing portion, wherein the heat exchanger (a) a heat medium into which the heat medium flows An upper connection body having an inlet portion and a plurality of heat medium outlet portions from which the heat medium flowing in from the heat medium inlet portion flows out; and (b) an upper end portion of the upper connection body in the heat medium outlet portion of the upper connection body. A plurality of heat collecting and radiating tubes each detachably connected to flow down the heat medium flowing out from the heat medium outflow portion; and (c) a lower end portion of each of the heat collecting and radiating tubes is detachably connected from the heat collecting and radiating tube. The heat medium inflow portion into which the heat medium flowing out flows in, and the heat inflow from each of the heat medium inflow portions. A lower connection body having a heat medium outlet part that collects and discharges the heat medium, and (d) a lower end part connected to the heat medium outlet part of the lower connection body and the heat medium flowing out from the heat medium outlet part. And a return pipe that circulates.
This configuration has the following effects.
(1) Since it has a liquid-permeable cylindrical casing part buried in the ground or submerged in the liquid and a heat exchanger inserted in the casing part, the heat exchanger is protected by the casing part and heated. It is possible to prevent breakage of the exchanger, it is excellent in robustness, and liquid such as ground water and well water can freely move in and out of the casing part through the liquid-permeable casing part, and ground water (well water) Heat exchange between the liquid such as the heat exchanger and the heat transfer medium that flows through the heat-dissipating pipe of the heat exchanger, and the heat of the earth can be used effectively through the liquid flowing in the ground. Excellent efficiency.
(2) Since the casing part in which the heat exchanger is inserted has liquid permeability, there is no need to fill the casing part with earth and sand, fillers, etc. In such a case, only the heat exchanger can be easily taken out and repaired or exchanged, and the maintenance is excellent.
(3) Since the heat exchanger is inserted into the casing part, when embedded in the ground, the heat exchanger does not come into direct contact with the surrounding earth and sand. Since there is no need to refill the filler, the heat exchanger is not damaged during construction, and the construction and handling properties are excellent.
(4) An upper connection body having a heat medium inlet portion into which a heat medium flows in and a plurality of heat medium outlet portions from which the heat medium flowing in from the heat medium inlet portion flows out, and a heat medium whose upper end portion is an upper connection body. A plurality of heat collecting / radiating pipes that are detachably connected to the outflow part and flow down the heat medium flowing out from the heat medium outflow part, respectively, thereby branching the heat medium flowing into the upper connection body into a plurality of heat collecting / discharging pipes. Since the area of heat collection / dissipation can be expanded, heat can be exchanged efficiently with the liquid flowing inside the casing, and the efficiency of using geothermal heat is excellent. .
(5) A lower connector having a heat medium inflow portion into which a heat medium flowing out from each heat collecting and radiating pipe flows and a heat medium outlet portion that collects and discharges the heat medium flowing in from each heat medium inflow portion And a return pipe that is connected to the heat medium outlet of the lower connector and circulates the heat medium flowing out of the heat medium outlet. The heat transfer can be made to flow out of the return pipe in a short time, and can be quickly circulated in a short time, so heat exchange while passing through the return pipe can be kept low, and the effective use of earth heat is excellent. .
(6) Since the upper and lower ends of each heat collection and radiating tube are detachably connected to the heat medium outflow part of the upper connection body and the heat medium inflow part of the lower connection body, respectively, assembly and disassembly are easy and mass production is possible. In addition to exchanging the heat collecting and radiating tube, the length of the heat collecting and radiating tube can be selected according to the temperature of the liquid flowing in the ground or the ground and the amount of heat required. It is easy to lengthen and has excellent design flexibility.
(7) Since each heat-dissipating tube is detachably connected to the upper connector and the lower connector, only the heat-dissipating tube in which a malfunction such as breakage has occurred can be replaced. Excellent in properties.
(8) By having a plurality of heat collecting and radiating tubes, the surface area of the heat collecting and radiating tubes can be increased, and the flow rate of the heat medium flowing through each of the heat collecting and radiating tubes can be reduced. Therefore, heat can be sufficiently exchanged with the liquid in the casing portion, and the efficiency of heat exchange and the effective utilization of ground heat are excellent.

Here, the place where the heat exchange unit is installed may be a place where geothermal heat can be used directly or indirectly. In addition to excavating and setting up pits in the ground, it can also be installed using wells or wells dug toward the oil reservoir for oil extraction or in hot spring water. Moreover, if it embed | buries in the compost | manufacturing manufactured using garbage etc., the fermentation heat which generate | occur | produces in the manufacturing process of compost can also be used effectively.
The casing part should just be what can protect the heat exchanger inserted, and a material can be suitably selected from metals, such as concrete, iron, and stainless steel, a synthetic resin, etc. As the casing portion, a support pile or a friction pile used for construction of a structure can be used. In this case, since the heat exchanger can be embedded at the time of pile driving, there is no need to separately excavate a hole or the like, and the workability is excellent and the construction period can be shortened. In particular, when a concrete pile is used as the casing part, it can be easily embedded in the ground, and is excellent in workability and durability.
The casing portion only needs to have liquid permeability, and may be provided with water permeability by providing a liquid passage hole in a peripheral wall portion formed of concrete, metal, synthetic resin, or by inserting a slit. Then, a mesh-like peripheral wall portion having liquid permeability may be formed by knitting metal or synthetic resin fibers.
The hole diameter, slit width, mesh size, etc. of the liquid passage hole formed in the peripheral wall part vary depending on the size (diameter) of the casing part and the geology of the place where the casing part is embedded, but the general ground In the case, it is preferable to form the film in a range of 3 mm to 100 mm. As these dimensions become smaller than 3 mm, clogging tends to occur, the liquid flow tends to deteriorate, and the heat exchange efficiency tends to decrease. There is a tendency for sludge or the like to enter, making it difficult for the liquid to flow through the inside of the casing portion, which tends to reduce the heat exchange efficiency.
In addition, the number and arrangement | positioning of a liquid flow hole and a slit can be suitably selected in the range which does not impair the rigidity and durability of a casing part.

As the heat collection and return pipe and the return pipe, those formed of a synthetic resin such as polypropylene, polybutene, and polyamide, or a metal such as titanium or stainless steel are preferably used. Among these, those made of synthetic resin are preferable because they are excellent in moldability, hardly corrode, and excellent in durability. In addition, a simple cylindrical tube may be used as the heat collecting and radiating tube, but when a corrugated tube (bellows tube) is used, the heat collecting and radiating tube before assembly can be wound and bundled in a coil shape and conveyed. It is easy to lengthen and excels in transportability and workability.
As the material of the upper connection body and the lower connection body, the same materials as those of the heat-radiating pipe and the return pipe line are preferably used.
The heat medium outflow portion of the upper connection body and the heat medium inflow portion of the lower connection body only need to be detachably connected to the upper end portion and the lower end portion of the heat collecting and radiating pipe, respectively. It may be connected directly by fitting or screwing, or may be connected via a joint or the like, but those connected by screwing are excellent in fixing reliability and stability and are preferably used. In addition, when connecting by screwing, whichever may be a male screw or a female screw, the use of a cap nut makes it easy to assemble and disassemble and has excellent workability.
The tube diameter, number, and arrangement of the heat collecting and radiating tubes can be selected as appropriate. For example, a plurality of heat collecting and radiating tubes may be arranged on the circumference or may be arranged in a straight line. In addition, the length of the heat collecting / radiating tube can be appropriately selected according to the temperature in the ground in which the heat exchange unit is buried and the required amount of heat, but instead of preparing the heat collecting / radiating tubes of various lengths in advance. Moreover, it is excellent in versatility and mass-productivity by connecting the heat-radiating pipes of a predetermined length as required.

Invention of Claim 2 is the heat exchange unit of Claim 1, Comprising: The said upper connection body of the said heat exchanger is formed in the hollow ring shape which has a through-hole in the center part, The said heat exchange The upper end side of the return pipe of the vessel is configured to be inserted through the through hole of the upper connector.
With this configuration, in addition to the operation obtained in the first aspect, the following operation can be obtained.
(1) Since the upper connection body of the heat exchanger is formed in a hollow ring shape having a through hole in the center portion, and the upper end side of the return pipe of the heat exchanger is inserted through the through hole of the upper connection body and penetrated. Depending on the length of the heat-dissipating tube, the upper connector can be easily moved up and down along the longitudinal direction of the return tube, regardless of the length of the heat-dissipating tube. The body can be made common, and it excels in versatility, mass productivity, and assembly workability.

  Here, the through-hole of the upper connecting member is not limited to the same shape as or similar to the outer shape of the return tube, as long as the return tube can be inserted. In addition, when the shape of the through hole is formed to be approximately the same as the outer shape of the return pipe or slightly larger than the outer shape of the return pipe, the return pipe can suppress the rattling and displacement of the upper connection body. In addition, the return pipe is not easily deformed and has excellent durability and workability.

Invention of Claim 3 is a heat exchange unit of Claim 1 or 2, Comprising: The said return pipe of the said heat exchanger is standingly arranged in the center part of the said lower connection body of the said heat exchanger, A plurality of the heat-dissipating and radiating tubes of the heat exchanger are arranged on the outer periphery of the return tube.
With this configuration, in addition to the operation obtained in the first or second aspect, the following operation can be obtained.
(1) The heat exchanger's return pipe is erected at the center of the lower connector of the heat exchanger, and the heat exchanger's plurality of heat extraction / radiation pipes are arranged on the outer periphery of the return pipe, thereby collecting / dissipating heat. Heat exchange between the pipe and the liquid flowing inside the casing is promoted, and heat exchange between the return pipe and the liquid is kept low, and the heat absorbed by the liquid from the ground is effectively used. It can be used for heating or cooling of the heat medium, and is excellent in the efficiency of heat exchange and the effective utilization of ground heat.

  Here, by arranging a plurality of heat collecting / radiating tubes on the same circumference or at equal angular intervals, the heat collecting / dissipating amount (= temperature of the heat medium) in each of the heat collecting / radiating tubes is made substantially uniform. be able to. As a result, the heat medium flowing into the lower connector through each heat collecting / radiating pipe through the heat medium inflow part is collected and discharged from the heat medium outlet part, and when the heat medium is circulated through the return pipe, temperature spots are generated in the heat medium. The flow is smooth and the circulation efficiency of the heat medium is excellent.

Invention of Claim 4 is the heat exchange unit of any one of Claim 1 thru | or 3, Comprising: Each said heat extraction / radiation pipe | tube of the said heat exchanger has several pipe body in series It has the structure formed by connecting.
With this configuration, in addition to the action obtained in any one of claims 1 to 3, the following action is obtained.
(1) Since each heat collecting / radiating pipe of the heat exchanger is formed by connecting a plurality of pipes in series, the length of the heat collecting / radiating pipe can be freely adjusted, and assembly and disassembly workability Excellent design flexibility.
(2) Since multiple pipes are connected in series to form a heat-dissipating pipe, in the event of problems such as breakage, it can be dealt with by partial replacement of the pipe. Excellent resource.
(3) Since it can be transported in the state of a short tube before construction and connected in the field to form a long heat-dissipating tube, it is excellent in transportability and mass productivity.

  Here, the tube body corresponds to a part obtained by dividing the heat collecting / radiating tube, and the material and shape thereof are the same as those of the heat collecting / radiating tube. Tubes may be connected directly or via a joint or the like. In particular, those connected by screwing are excellent in fixing reliability and stability, but when a cap nut is used, assembly and disassembly work is easy and workability is excellent.

Invention of Claim 5 is a heat exchange unit of Claim 4, Comprising: It has the intermediate connection body arrange | positioned by the connection part of these several pipe bodies, The said intermediate connection body is an upstream side An inflow side connection portion to which the lower end portion of the tube body is detachably connected, an outflow side connection portion to which the upper end portion of the downstream tube body is detachably connected, and an insertion through which the return pipe is inserted And a hole.
With this configuration, in addition to the operation obtained in the fourth aspect, the following operation can be obtained.
(1) An intermediate connection body disposed in a connecting portion of a plurality of tube bodies includes an inflow side connection portion in which a lower end portion of an upstream tube body is detachably connected and an upper end portion of a downstream tube body By having an outflow side connection part that is detachably connected, a plurality of tubes can be easily connected by an intermediate connector, and a plurality of heat collecting tubes can be integrated and reinforced by the intermediate connector. Therefore, the length can be increased and the workability and durability are excellent.
(2) The intermediate connection body disposed at the connecting portion of the plurality of tube bodies has an insertion hole through which the return pipe is inserted, whereby the intermediate connection body is disposed at an arbitrary position in the longitudinal direction of the return pipe. It is excellent in design flexibility.
(3) Since the return pipe is inserted into the insertion hole of the intermediate connection body, the plurality of heat-radiating / radiating pipes and the return pipe can be fixed and handled integrally, so that the burying work is easy and the workability is excellent.

  Here, the material of the intermediate connection body is preferably the same as that of the heat-radiating pipe and the return pipe. In addition, as the inflow side connection portion and the outflow side connection portion of the intermediate connection body, those similar to the heat medium outflow portion of the upper connection body and the heat medium inflow portion of the lower connection body are preferably used. The intermediate connection body is preferably formed in a hollow ring shape like the upper connection body, and the insertion hole can be formed in the same manner as the through hole of the upper connection body.

According to the heat exchange unit of the present invention configured as described above, the following effects can be obtained.
According to invention of Claim 1, it has the following effects.
(1) The heat exchanger can be protected by the casing part to prevent the heat exchanger from being damaged, and liquids such as ground water and well water can be passed inside and outside the casing part through the casing part that has excellent robustness and liquid permeability. It is possible to move freely, and by exchanging heat reliably between the liquid such as ground water (well water) and the heat medium flowing through the heat extraction and radiating pipe of the heat exchanger, Thus, it is possible to provide a heat exchange unit that can effectively use the heat of the heat exchange and is excellent in heat exchange reliability and efficiency.

According to invention of Claim 2, in addition to the effect of Claim 1, it has the following effects.
(1) The upper connecting body can be easily moved in the vertical direction along the length of the return pipe according to the length of the heat collecting / radiating pipe. It is possible to provide a heat exchanging unit excellent in versatility, mass productivity, and assembling workability in which a lower connection body can be shared.

According to invention of Claim 3, in addition to the effect of Claim 1 or 2, it has the following effects.
(1) Heat exchange between the heat collecting and radiating pipe and the liquid flowing inside the casing part is promoted, and heat exchange between the return pipe and the liquid flowing inside the casing part is low. Provided is a heat exchanging unit excellent in heat exchanging efficiency and effective use of earth heat, in which heat can be heated or cooled by effectively using the heat absorbed by the liquid from the earth without being wasted. be able to.

According to invention of Claim 4, in addition to the effect of any one of Claims 1 thru | or 3, it has the following effects.
(1) The length of the heat-collecting / extracting tube can be adjusted freely. When troubles such as breakage occur, assembly and disassembly workability and design can be handled by partial replacement of the tube. It is possible to provide a heat exchange unit excellent in flexibility, maintenance, and resource saving.

According to invention of Claim 5, in addition to the effect of Claim 4, it has the following effects.
(1) Multiple pipes can be easily connected with an intermediate connector, and multiple heat-dissipating tubes are integrated and reinforced with the intermediate connector, making it easy to lengthen the workability and durability It is possible to provide a heat exchange unit that is excellent in performance.

Side surface schematic diagram which shows the heat exchange unit in Embodiment 1. FIG. Main part schematic perspective view which shows the casing part used for the heat exchange unit in Embodiment 1. FIG. (A) Schematic cross-sectional view taken along line AA in FIG. 1 (b) Schematic cross-sectional view taken along line BB in FIG. CC cross section schematic diagram of FIG.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. The technical scope of the present invention is not limited to this embodiment.
(Embodiment 1)
The heat exchange unit in Embodiment 1 is demonstrated.
FIG. 1 is a schematic side view showing a heat exchange unit according to the first embodiment, FIG. 2 is a schematic perspective view showing a main part of a casing used for the heat exchange unit according to the first embodiment, and FIG. FIG. 3 is a schematic cross-sectional view taken along line AA in FIG. 1, FIG. 3B is a schematic cross-sectional view taken along line BB in FIG. 1, and FIG. 4 is a schematic cross-sectional view taken along line CC in FIG. FIG.
In FIG. 1, 1 is a heat exchange unit in the first embodiment, 1a is a heat exchanger of a heat exchange unit 1 inserted in a casing part 10 to be described later, and 2 is a heat exchanger 1a formed in a hollow ring shape. The upper connection body 2a is formed on the upper surface side of the upper connection body 2 and the heat medium inlet portion into which the heat medium flows, and 2b is formed on the lower surface side of the upper connection body 2 and the heat medium flowing in from the heat medium inlet portion 2a A plurality of heat medium outflow portions flowing out, 2c is a male screw portion formed on the outer periphery of the heat medium outflow portion 2b, 3 is a through hole formed in the central portion of the upper connector 2, and 4 is polypropylene, polybutene, polyamide The heat collecting and radiating pipe of the heat exchanger 1a in which a plurality of pipe bodies 4a formed of corrugated pipes made of synthetic resin or the like are connected, 4b is disposed at the upper end of the pipe body 4a, and the heat medium flows out of the upper connector 2 Male screw part 2c of the part 2b and male screw of the outflow side connection part 6b of the intermediate connection body 6 to be described later A cap nut-like upper end connection portion 4c is detachably screwed to the portion 6c, and 4c is disposed at the lower end portion of the tube body 4a. The lower end connection part 5 of the cap nut shape removably screwed to the male screw part 6c of the inflow side connection part 6a of the body 6 is a lower connection body 5a of the heat exchanger 1a formed in the shape of a hollow disk. Is a heat medium inflow portion formed on the upper surface side of the lower connection body 5 and into which the heat medium flowing down the heat collecting and radiating pipe 4 flows, 5b is a male screw portion formed on the outer periphery of the heat medium inflow portion 5a, and 5c is a lower connection The heat medium outlet part 6 is formed in the center part on the upper surface side of the body 5 and collects and discharges the heat medium flowing in from each heat medium inflow part 5a, and 6 is formed in a hollow ring shape and is arranged at the connecting part of the tube body 4a. The intermediate connection body 6a of the heat exchanger 1a provided is formed on the upper surface side of the intermediate connection body 6 and flows down the upstream pipe body 4a. A plurality of inflow side connection portions 6b into which the medium flows, 6b is formed on the lower surface side of the intermediate connection body 6, and an outflow side connection portion from which the heat medium flowing in from the inflow side connection portion 6a flows out, 6c is the inflow side connection portion 6a and outflow A male screw portion formed on the outer periphery of the side connection portion 6b, 7 is an insertion hole formed in the central portion of the intermediate connection body 6, and 8 is formed of a synthetic resin such as polypropylene, polybutene or polyamide, or a metal such as titanium. The lower end portion is connected to the heat medium outlet portion 5c of the lower connection body 5, and the upper end side and the middle in the longitudinal direction are inserted through the through hole 3 of the upper connection body 2 and the insertion hole 7 of the intermediate connection body 6 so as to penetrate therethrough. A return pipe 9 of the heat exchanger 1a for circulating the heat medium flowing out from the outlet 5c, 9 is connected to the heat medium inlet 2a of the upper connector 2, and a heat medium supply pipe for supplying the heat medium to the heat exchanger 1a. Is the casing part of the heat exchange unit 1 using concrete piles, Reference numeral 10 a denotes a plurality of liquid passage holes formed in the peripheral wall of the casing portion 10.
In FIG. 1, for convenience of explanation, only one heat collecting / radiating tube 4 is shown, and the other heat collecting / radiating tube 4 is omitted. However, each heat medium outflow portion 2b and lower connection of the upper connector 2 is omitted. Each heat medium inflow portion 5a of the body 5 is connected by a heat collecting / discharging pipe 4 to which the pipe body 4a is connected.

In the present embodiment, as shown in FIG. 2, a plurality of liquid passage holes 10 a are formed in the peripheral wall portion of the concrete pile to impart liquid permeability and used for the casing portion 10. Thereby, when embedding the heat exchange unit 1 in the ground, the installation work can be easily performed, the workability is excellent, and the construction period can be shortened. In addition, the casing part 10 should just be what can protect the heat exchanger 1a inserted, and can use metals, such as iron and stainless steel, synthetic resin other than concrete, as a material.
The hole diameter of the liquid passage hole 10a was 3 mm to 100 mm. As the hole diameter of the liquid passage hole 10a becomes smaller than 3 mm, clogging is likely to occur, the flow of liquid (groundwater, etc.) tends to deteriorate, and the heat exchange efficiency tends to decrease, and as it becomes larger than 100 mm, This is because it has been found that earth and sand, sludge, and the like enter the inside of the casing part 10, and it becomes difficult for the liquid to flow through the inside of the casing part 10, so that the heat exchange efficiency tends to decrease. By setting the hole diameter of the liquid passage hole 10a to 3 mm to 100 mm, it is excellent in flowing water such as groundwater, and heat exchange efficiency can be improved.
In addition, the hole diameter of the liquid passage hole 10a does not need to be the same, You may combine the liquid passage hole 10a of a different hole diameter.
Moreover, the number and arrangement | positioning of the liquid flow hole 10a can be suitably selected in the range which does not impair the rigidity and durability of the casing part 10. FIG. In the present embodiment, the liquid passage holes 10a are randomly arranged as shown in FIG. 2, but may be regularly arranged. Further, instead of forming the liquid passage hole 10 a in the peripheral wall portion of the casing portion 10, a slit may be inserted. The slit can be 3 mm to 100 mm, which is the same as the hole diameter of the liquid hole 10a, in the width direction, so that the same action and effect as the liquid hole 10a can be obtained. The slit may be formed in parallel with the length direction of the casing part 10 or may be formed to be inclined with respect to the length direction.
Moreover, instead of forming the liquid passage hole 10a or forming a slit later in the peripheral wall portion of the casing portion 10 as in the present embodiment, the casing portion is made of a porous (porous) material from the beginning. 10 or the mesh-like peripheral wall portion having liquid permeability is formed by knitting metal or synthetic resin fibers, the processing of the liquid passage holes 10a and slits can be omitted.

In the present embodiment, as shown in FIGS. 3A and 4, the shape of the through hole 3 of the upper connection body 2 and the insertion hole 7 of the intermediate connection body 6 is slightly larger than the outer shape of the return pipe 8. The return pipe 8 can be easily inserted. When the return pipe 8 is inserted into the through hole 3 of the upper connector 2 and the insertion hole 7 of the intermediate connector 6, rattling and displacement of the upper connector 2 and the intermediate connector 6 can be suppressed. In addition, this makes it difficult for deformation of the heat-radiating / radiating pipe 4 and the return pipe 8 during construction such as burial, and is excellent in durability and workability. The through hole 3 of the upper connecting body 2 and the insertion hole 7 of the intermediate connecting body 6 only need to be able to pass through the return pipe 8, and do not necessarily have the same shape as or similar to the outer shape of the return pipe 8.
Further, in the present embodiment, as shown in FIG. 3, a plurality of heat collecting / radiating tubes 4 are arranged at equal angular intervals on the same circumference, and the heat collecting / dissipating amount in each of the heat collecting / radiating tubes 4 (= temperature of the heat medium). ) To be substantially uniform. As a result, the heat medium flowing into the lower connector 5 from each heat collecting / radiating pipe 4 through the heat medium inflow part 5a is collected and discharged from the heat medium outlet part 5c, and when the heat medium is circulated through the return pipe 8, There is no temperature irregularity in the medium, the flow is smooth, and the circulation efficiency of the heat medium is excellent.
In addition, the number and arrangement | positioning of the heat collecting / radiating pipe | tube 4 are not limited to this, It can select suitably.
Further, in the present embodiment, the intermediate connection body 6 is disposed at the connecting portion of the tube body 4a constituting the heat collection / radiation tube 4, thereby integrating the plurality of heat collection / radiation tubes 4 and improving the durability. When the distance from the upper connection body 2 to the lower connection body 5 is short, the intermediate connection body 6 is not used and the upper connection body 2 and the lower connection body 5 may be directly connected by the tube body 4a. In addition, when connecting the pipe body 4a in several places, the intermediate connection body 6 does not need to be provided in all the connection parts of the pipe body 4a, and the arrangement | positioning space | interval can be selected suitably. Moreover, although the pipe bodies 4a can also be connected without using the intermediate connection body 6, in that case, the pipe bodies 4a may be directly connected or may be connected via a joint.

The usage method of the heat exchange unit in Embodiment 1 comprised as mentioned above is demonstrated.
The heat exchange unit 1 in the first embodiment is embedded in a hole dug in the ground, or is submerged in an existing well, underground water (in a well), hot spring water, or the like. Although the surroundings of the heat collection / radiation pipe 4 and the return pipe 8 of the heat exchanger 1a are surrounded by the casing portion 10, a plurality of liquid passage holes 10a are formed in the peripheral wall, and ground water, well water, etc. flowing in the ground Can move freely inside and outside the casing part 10 and can directly exchange heat between the liquid such as ground water (well water) and the heat exchanger 1a. It is not necessary to fill a filler such as silicon grains such as concrete, mortar, earth and sand, earth, sand, silica sand, and waste silicon.
The upper ends of the return pipe 8 and the heat medium supply pipe 9 are connected to a load device (not shown) such as a heat pump, a cooling / heating device, a snow melting device, etc. It supplies to the upper connector 2 of the exchanger 1a. The heat medium flows down from the upper end to the lower end of the heat collecting and radiating pipe 4 and exchanges heat with the ground via a liquid such as ground water (well water) flowing inside the casing part 10. The heat medium having undergone heat exchange gathers at the lower connector 5 and flows out from the heat medium outlet 5c, and is circulated to the load device by the return pipe 8. In this way, the heat medium circulates between the heat exchange unit 1 and the load device.

According to the heat exchange unit in Embodiment 1 of the present invention, the following operation is obtained.
(1) Since it has a liquid-permeable cylindrical casing part buried in the ground or submerged in the liquid and a heat exchanger inserted in the casing part, the heat exchanger is protected by the casing part and heated. It is possible to prevent breakage of the exchanger, it is excellent in robustness, and liquid such as ground water and well water can freely move in and out of the casing part through the liquid-permeable casing part, and ground water (well water) Heat exchange between the liquid such as the heat exchanger and the heat transfer medium that flows through the heat-dissipating pipe of the heat exchanger, and the heat of the earth can be used effectively through the liquid flowing in the ground. Excellent efficiency.
(2) Since the casing part in which the heat exchanger is inserted has liquid permeability, there is no need to fill the casing part with earth and sand, fillers, etc. In such a case, only the heat exchanger can be easily taken out and repaired or exchanged, and the maintenance is excellent.
(3) Since the heat exchanger is inserted into the casing part, when embedded in the ground, the heat exchanger does not come into direct contact with the surrounding earth and sand. Since there is no need to refill the filler, the heat exchanger is not damaged during construction, and the construction and handling properties are excellent.
(4) An upper connection body having a heat medium inlet portion into which a heat medium flows in and a plurality of heat medium outlet portions from which the heat medium flowing in from the heat medium inlet portion flows out, and a heat medium whose upper end portion is an upper connection body. A plurality of heat collecting / radiating pipes that are detachably connected to the outflow part and flow down the heat medium flowing out from the heat medium outflow part, respectively, thereby branching the heat medium flowing into the upper connection body into a plurality of heat collecting / discharging pipes. Since the area of heat collection / dissipation can be expanded, heat can be exchanged efficiently with the liquid flowing inside the casing, and the efficiency of using geothermal heat is excellent. .
(5) A lower connector having a heat medium inflow portion into which a heat medium flowing out from each heat collecting and radiating pipe flows and a heat medium outlet portion that collects and discharges the heat medium flowing in from each heat medium inflow portion And a return pipe that is connected to the heat medium outlet of the lower connector and circulates the heat medium flowing out of the heat medium outlet. The heat transfer can be made to flow out of the return pipe in a short time, and can be quickly circulated in a short time, so heat exchange while passing through the return pipe can be kept low, and the effective use of earth heat is excellent. .
(6) Since the upper and lower ends of each heat collection and radiating tube are detachably connected to the heat medium outflow part of the upper connection body and the heat medium inflow part of the lower connection body, respectively, assembly and disassembly are easy and mass production is possible. In addition to exchanging the heat collecting and radiating tube, the length of the heat collecting and radiating tube can be selected according to the temperature of the liquid flowing in the ground or the ground and the amount of heat required. It is easy to lengthen and has excellent design flexibility.
(7) By having a plurality of heat collecting and radiating tubes, the surface area of the heat collecting and radiating tubes can be increased, and the flow rate of the heat medium flowing through each of the heat collecting and radiating tubes can be reduced. Therefore, heat can be sufficiently exchanged with the liquid in the casing portion, and the efficiency of heat exchange and the effective utilization of ground heat are excellent.
(8) Since the upper connection body of the heat exchanger is formed in a hollow ring shape having a through hole at the center, and the upper end side of the return pipe of the heat exchanger is inserted through the through hole of the upper connection body and penetrated. Depending on the length of the heat-dissipating tube, the upper connector can be easily moved up and down along the longitudinal direction of the return tube, regardless of the length of the heat-dissipating tube. The body can be made common, and it excels in versatility, mass productivity, and assembly workability.
(9) The heat exchanger return pipe is erected at the center of the lower connector of the heat exchanger, and a plurality of heat collection / radiation pipes of the heat exchanger are arranged on the outer periphery of the return pipe, thereby collecting / dissipating heat. Heat exchange between the pipe and the liquid flowing inside the casing is promoted, and heat exchange between the return pipe and the liquid is kept low, and the heat absorbed by the liquid from the ground is effectively used. It can be used for heating or cooling of the heat medium, and is excellent in the efficiency of heat exchange and the effective utilization of ground heat.
(10) Since each heat collecting / radiating tube of the heat exchanger is formed by connecting a plurality of tubes in series, the length of the heat collecting / radiating tube can be freely adjusted, and workability of assembly and disassembly Excellent design flexibility.
(11) Since a plurality of tubes are connected in series to form a heat-dissipating tube, in the event of a failure such as breakage, it can be dealt with by partial replacement of the tube. Excellent resource.
(12) Since it can be transported in the state of a short tube before construction and connected on site to form a long heat-dissipating tube, it is excellent in transportability and mass productivity.
(13) An intermediate connection body disposed in a connecting portion of a plurality of tube bodies includes an inflow side connection portion in which a lower end portion of an upstream tube body is detachably connected, and an upper end portion of a downstream tube body. By having an outflow side connection part that is detachably connected, a plurality of tubes can be easily connected by an intermediate connector, and a plurality of heat collecting tubes can be integrated and reinforced by the intermediate connector. Therefore, the length can be increased and the workability and durability are excellent.
(14) The intermediate connection body disposed in the connecting portion of the plurality of tube bodies has an insertion hole through which the return pipe is inserted, whereby the intermediate connection body is disposed at an arbitrary position in the longitudinal direction of the return pipe. It is excellent in design flexibility.
(15) Since the return pipe is inserted into the insertion hole of the intermediate connection body, the plurality of heat-radiating / radiating pipes and the return pipe can be fixed and handled integrally, so that the burying work is easy and the workability is excellent.

  The present invention has a simple configuration, can simplify the shape, can be easily assembled, disassembled and partially replaced, and is not only excellent in mass production, maintenance, storage, and transportability, but also has a longer length. It is easy to design, has excellent design flexibility and versatility, can reliably protect the heat exchanger, is not damaged during construction and maintenance, and has excellent workability, handleability, and robustness. The cost can be reduced by shortening the construction period, and the efficiency of heat exchange by exchanging heat through groundwater flowing underground, groundwater accumulated in the ground (well water), hot spring water, oil, etc. The heat exchange unit that excels in energy, can effectively use underground heat, and is excellent in energy saving and environmental protection, can contribute to energy saving and environmental protection.

DESCRIPTION OF SYMBOLS 1 Heat exchange unit 1a Heat exchanger 2 Upper connection body 2a Heat-medium inlet part 2b Heat-medium outflow part 2c, 5b, 6c Male screw part 3 Through hole 4 Heat-radiating pipe 4a Tube body 4b Upper end connection part 4c Lower end connection part 5 Lower part Connection body 5a Heat medium inflow section 5c Heat medium outlet section 6 Intermediate connection body 6a Inflow side connection section 6b Outflow side connection section 7 Insertion hole 8 Return pipe 9 Heat medium supply pipe 10 Casing section 10a Through hole

Claims (5)

A heat exchange unit that exchanges heat with underground heat via a liquid that is buried in the ground or submerged in the liquid and flows through the ground,
A liquid-permeable cylindrical casing part buried in the ground or submerged in the liquid, and a heat exchanger inserted in the casing part,
The heat exchanger is
(A) an upper connection body having a heat medium inlet portion into which a heat medium flows and a plurality of heat medium outlet portions from which the heat medium flowing in from the heat medium inlet portion flows out;
(B) a plurality of heat collecting and radiating pipes, each having an upper end portion detachably connected to the heat medium outflow portion of the upper connecting body and allowing the heat medium flowing out from the heat medium outflow portion to flow down;
(C) A heat medium inflow portion into which the heat medium flowing out from the heat collecting and radiating tube flows in and a lower end portion of each of the heat collecting and radiating tubes is detachably connected; A lower connection body having a heat medium outlet for collecting and discharging
(D) a return pipe having a lower end connected to the heat medium outlet of the lower connector and circulating the heat medium flowing out of the heat medium outlet;
A heat exchange unit comprising: The upper connection body of the heat exchanger is formed in a hollow ring shape having a through hole in the center, and the upper end side of the return pipe of the heat exchanger is inserted through the through hole of the upper connection body to penetrate therethrough. The heat exchange unit according to claim 1, wherein: The return pipe of the heat exchanger is erected at the center of the lower connection body of the heat exchanger, and a plurality of the heat radiating pipes of the heat exchanger are disposed on the outer periphery of the return pipe. The heat exchange unit according to claim 1 or 2. The heat exchanging unit according to any one of claims 1 to 3, wherein each of the heat extraction and radiating tubes of the heat exchanger is formed by connecting a plurality of tubes in series. An intermediate connection body disposed in a connecting portion of the plurality of pipe bodies, the intermediate connection body including an inflow side connection section in which a lower end portion of the upstream pipe body is detachably connected; and a downstream side The heat exchange unit according to claim 4, further comprising: an outflow side connection portion to which an upper end portion of the tube body is detachably connected; and an insertion hole through which the return tube is inserted.

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