JP2009002631A - Heat exchanger and heat exchanging system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly efficient heat exchanger and heat exchanging system enabling heat exchange and heat generation of an electric wire, preventing the possibility of pitch misalignment etc. of a pipe of the heat exchanger and facilitating processing. <P>SOLUTION: The pipe 5 is wound along a spiral groove 3 on an outer face of a spirally grooved pipe 7, and the electric wire 31 is penetrated through inside of the spirally grooved pipe 7. Fluid serving as a heat medium is made to flow inside the pipe 5. When the fluid is made to flow inside the pipe 5 from the direction A, the fluid flows inside the pipe 5 spirally wound along the spiral groove 3 on the spirally grooved pipe 7, and flows out to the direction B when reaching an end part of the spirally grooved pipe 7. At this time, the heat exchanger 1 can perform heat exchange between heat generated from the electric wire 31 and the fluid flowing around the spirally grooved pipe 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

INDUSTRIAL APPLICABILITY The present invention is capable of exchanging heat with a heated electric wire with high efficiency, has a simple manufacturing method, and has a long life and low cost. It is about.

While environmental problems such as global warming are attracting attention, various heat exchange systems that recover existing heat and effectively use the heat without using fossil fuels have been developed. As such a heat exchanger, for example, there is a geothermal steel pipe pile in which a heat exchange pipe is spirally wound around a steel pipe pile and heat exchange with geothermal heat is performed (Patent Document 1).

On the other hand, it is known that a power cable such as a power transmission line generates heat by power transmission. However, since an increase in the temperature of the electric wire causes a decrease in the transmission capacity, it is effective to suppress an increase in the temperature of the electric wire accompanying power transmission in order to increase the transmission capacity.

As a power transmission line cooling device, for example, ice produced by an ice refrigerator is stored in an ice heat storage tank, and the cooling water containing this ice is sent to cooling pipes in the cave by a water pump and circulated in the cave. By doing so, there is a device that cools the inside and indirectly cools the power transmission line (Patent Document 2).
JP 2005-188866 A JP 2000-139019 A

However, the geothermal steel pipe pile in which the pipe for heat exchange according to Patent Document 1 is spirally wound is a heat exchanger that performs heat exchange with the geothermal heat, and the pipe pile is spirally wound on the ground. Although it is screwed in, the pitch of the spiral pipe changes due to deformation, etc. during installation, and heat exchange efficiency as designed cannot be obtained, and there is a risk of contact between pipes, so the pipe pitch is reduced There is a problem that the heat exchange efficiency per unit length is low. In particular, since it is heat exchange with geothermal heat, there is a problem that the heat capacity that can be exchanged is limited.

Moreover, although the cooling device by patent document 2 can cool a power transmission line, since it uses ice made with an ice refrigerator, it requires energy for cooling, and in the case of a large-diameter sinus. However, although the power transmission line can be cooled by the cooling device, there is a problem that it is difficult to cool the electric wire in the conduit having a relatively small diameter. In particular, there is a problem that the waste heat after cooling cannot be used.

The present invention has been made in view of such a problem, and there is no risk of causing a pitch shift of a pipe of a heat exchanger, it is easy to process, and can perform heat exchange with an electric wire with high efficiency. An object is to provide a heat exchanger and a heat exchange system.

In order to achieve the above-described object, the first invention provides a spiral grooved tube having a spiral groove on the outer surface, a pipe wound along the groove of the spiral grooved tube, and the spiral grooved tube. The outer diameter of the pipe wound around the spiral grooved tube is substantially the same as the groove width of the groove wound around the pipe, or from the groove width. The heat exchanger is characterized in that a fluid flows through the pipe.

Here, the groove width refers to the groove width at the approximate center in the depth direction of the spiral groove, the outer diameter of the pipe wound around the spiral grooved tube, and the groove around which the pipe is wound. The groove width refers to the outer diameter and groove width of the pipe after deformation, taking into consideration deformation when the pipe is wound around the spiral groove.

A gap between the pipe and the groove may be filled with a heat conductive medium. Further, the curvature at the outer diameter of the pipe and the curvature at the bottom of the groove may be substantially the same.

The pipe may have an outer diameter smaller than a depth of the groove and the pipe wound around the spiral grooved tube may not protrude from the outer peripheral surface of the spiral grooved tube. Moreover, a film may be wound around the outer peripheral surface of the spiral grooved tube around which the pipe is wound. A plurality of the pipes may be wound around one groove.

The spiral grooved tube may be made of resin. Further, the pipe may be made of resin, may be made of metal, and may have a multilayer structure having a resin layer and a metal layer.

According to the first invention, since the pipe is wound along the groove of the spiral grooved pipe, the winding pitch of the pipe does not change during processing, transportation, embedding, etc. It is easy to process the spiral shape, and does not cause a pitch shift during embedding, so it is possible to obtain a large pipe winding length in a spiral grooved tube per unit length, which is low cost and long life A heat exchanger can be provided. In particular, since the electric wire is penetrated inside the spiral grooved pipe and the pipe wound around can be brought close to the groove bottom of the spiral groove, the heat generated from the electric wire and the fluid flowing through the pipe are heated with high efficiency. A heat exchanger capable of exchange can be provided.

According to a second aspect of the present invention, a pipe is wound along the groove of a spiral grooved tube having a spiral groove on the outer surface, and the outer diameter of the pipe wound around the spiral grooved tube A heat exchanger through which an electric wire passes is provided in the spiral grooved tube around which the pipe is wound, and is substantially the same as or smaller than the groove width of the groove in the wound state, and flows in the pipe. In the heat exchange system, the fluid exchanges heat with the heat generated from the electric wire.

The fluid that has undergone heat exchange may be flowed through the structure, and the heat of the fluid may be used for the structure, or the heat of the fluid that has undergone heat exchange may be used for preheating the thermal equipment.

According to the second invention, since the pipe is wound along the groove of the spiral grooved tube, the winding pitch of the pipe does not change during processing, transportation, embedding, etc. It is easy, and since the electric wire penetrates inside and the pipe wound around can be brought close to the groove bottom of the spiral groove, heat exchange is performed between the heat generated from the electric wire and the fluid flowing through the pipe with high efficiency. It is possible to provide a heat exchange system capable of exchanging heat.

ADVANTAGE OF THE INVENTION According to this invention, there is no fear that the pitch shift of the pipe of the heat exchanger occurs, processing is easy, and a highly efficient heat exchanger and heat exchange system that can exchange heat with the electric wire are provided. To do.

Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a perspective view showing the appearance of the heat exchanger 1 according to the present embodiment, and FIG. 2 is a perspective view showing the appearance of the spiral grooved tube 7.

The heat exchanger 1 is mainly composed of a spiral grooved tube 7, a pipe 5 and an electric wire 31. The spiral grooved tube 7 is a tubular member having the spiral groove 3 on the outer surface. The pipe 5 is wound along the spiral groove 3 on the outer surface of the spiral grooved tube 7, and an electric wire 31 is passed through the spiral grooved tube 7. Joints 6 are provided at both ends of the pipe 5 and connected to a pump or the like. A fluid which is a heat medium flows inside the pipe 5.

In FIG. 1, when a fluid is flowed into the pipe 5 from the direction A, the fluid flows in the pipe 5 spirally wound along the spiral groove 3 around the spiral grooved tube 7. When it reaches the end of 7, it flows out in the B direction. Here, when the electric wire 31 is energized, heat is generated according to the current flowing through the electric wire 31 and the electric resistance value of the electric wire 31. The electric wire 31 may be an ordinary electric power supply electric wire, or can generate heat by using an electric wire having a higher resistance value as long as the strength of the spiral grooved tube 7 does not decrease. And by doing in this way, the performance of a heat exchanger can be improved more. The heat exchanger 1 can exchange heat between the heat generated from the electric wire 31 and the fluid flowing around the spiral grooved tube 7.

Here, in order to obtain a more efficient heat exchanger, it is necessary to bring the pipe 5 and the spiral grooved tube 7 (groove bottom part 4) close to each other. Preferably, the pipe 5 and the groove bottom part 4 are in contact with each other. It is better to be. FIG. 3 is a view showing a cross section of the pipe 5 wound around the spiral grooved tube 7. In order to bring the spiral groove 3 and the pipe 5 closer, it is only necessary that the outer diameter of the pipe 5 is smaller than the groove width of the spiral groove 3 as shown in FIG. In this case, the pipe 5 fits into the spiral groove 3, and the distance between the pipe 5 and the groove bottom portion 4 becomes short. Further, depending on the shape of the spiral groove 3 and the like, the pipe 5 contacts not only the side portion of the spiral groove 3 but also the groove bottom portion 4 to obtain a contact portion 8 that is a contact portion between the groove bottom portion 4 and the pipe 5. Can do.

Here, the groove bottom portion 4 means the vicinity of the bottom of the groove shape in the spiral groove 3, and depends on the shape of the spiral groove 3, for example, a portion substantially parallel to the axial direction of the spiral groove tube 7 in the spiral groove 3. (FIG. 3A), a portion having a substantially constant curvature in the vicinity of the bottom of the spiral groove 3 (FIGS. 3B and 3C), etc., not only the deepest part of the spiral groove 3, but also a constant This means a portion having a width of. The groove width refers to the groove width at the approximate center (groove depth center 13) of the groove depth 11 of the spiral groove 3, and when the spiral groove 3 is deformed as will be described later, It points out (FIG. 3 (a)-(c)).

As a form in which the pipe 5 is brought close to the spiral groove 3, as shown in FIG. 3 (b), the pipe 5 is made efficient at the groove bottom 4 by making the curvature at the outer diameter of the pipe 5 substantially coincide with the curvature of the groove bottom 4. You can get closer. Desirably, the pipe 5 and the groove bottom 4 are in contact with each other to form the contact portion 8. In this case, since the contact portion 8 between the pipe 5 and the groove bottom portion 4 is close to a surface contact rather than a line contact, heat exchange between the electric wire 31 penetrating the spiral grooved tube 7 and the fluid flowing through the pipe 5 is performed. Furthermore, it can carry out efficiently.

Further, as shown in FIG. 3C, the pipe 5 to be wound is deformed to conform to the shape of the spiral groove 3 (groove bottom 4), and as a result, the pipe 5 can be brought closer to the groove bottom 4. it can. Even in this case, it is desirable to form the contact portion 8 with the pipe 5 and the groove bottom portion 4. That is, even when the outer diameter of the pipe 5 is slightly larger than that of the spiral groove 3, the pipe 5 is wound around the spiral groove 3 (direction A in the figure), so that the pipe 5 is wound with tension and spiral. It is deformed by the force received from the groove 3. Also in this case, as in FIG. 3B, when the pipe 5 and the groove bottom 4 are in contact with each other, the contact portion 8 is close to surface contact. Heat exchange with the fluid flowing through the pipe 5 can be performed more efficiently.

If the deformation resistance of the pipe 5 is sufficiently large with respect to the spiral groove 3 (groove bottom 4), the same effect can be obtained even if the spiral groove 3 (groove bottom 4) side is deformed. Both the spiral groove 3 (groove bottom 4) may be deformed. Even if the outer diameter of the pipe 5 is smaller than that of the spiral groove 3, the pipe 5 is strongly wound around the spiral groove 3, so that the pipe 5 is wound in the depth direction of the spiral groove 3 by the winding tension. You may deform | transform so that it may be crushed. In any case, it is better that the distance between the pipe 5 and the groove bottom 4 is as close as possible, preferably the contact portion 8 is formed, and more preferably the contact portion 8 is in surface contact.

The outer diameter of the pipe 5 (when the pipe 5 is deformed when it is wound around the spiral grooved tube 7, the diameter of the pipe 5 after deformation in the depth direction of the spiral groove 3) is the depth of the spiral groove 3. Desirably smaller than this. That is, it is desirable that the pipe 5 is accommodated in the spiral groove 3 and the pipe 5 does not protrude from the outer peripheral surface of the spiral grooved tube 7 (the top of the spiral groove 3). This is to prevent the pipe 5 from being damaged when the heat exchanger 1 is transported, handled, or constructed by being protruded by being protruded.

The sizes of the spiral grooved tube 7 and the pipe 5 vary depending on the place of use and the outer diameter of the electric wire 31. For example, the spiral grooved tube 7 has an inner diameter of 30 to 80 mm, and the pipe 5 has an inner diameter of about 5 to 13 mm. Can be used. Here, a pipe with an inner diameter of 13 mm × thickness of 2 mm (outer diameter of 17 mm) can be wound about 80 times on a spiral grooved tube 7 having an inner diameter of 80 mm, a pitch of 25 mm, and a length of 2 m. Can be wound. In the above example, when a pipe having an inner diameter of 17 mm and a wall thickness of 2.5 mm (outer diameter of 22 mm) is used, the pipe density with respect to the pitch of the spiral grooved tube 7 is increased.

Also, for example, a pipe 5 having an inner diameter of 6 mm and an outer diameter of 8.5 mm can be wound 200 times on a spiral grooved tube 7 having an inner diameter of 30 mm, a pitch of 10 mm, and a length of 2 m. In this case, about 28 m is also wound. Can do. That is, it is possible to wind a pipe having a length equal to or more than 10 times the length of the spiral grooved tube 7 at a pitch equal to the spiral grooved tube 7. Here, if the length of the heat exchanger 1 is 50 cm, the heat exchanger 1 may be 50 cm × 4 heat exchangers. The number of heat exchangers is not four, and any number of heat exchangers can be designed according to the capacity of the heat exchanger.

Here, although the material of the spiral grooved tube 7 is not specified, both resin and metal can be used, but insulating resin is more preferable than metal. Moreover, even when the heat exchanger 1 is buried in the ground and used, the spiral grooved tube 7 can normally withstand the earth pressure at the time of being buried in both cases made of resin and metal. Therefore, it is not necessary to fill the filler in particular, but in some cases, it is possible to fill the spiral grooved tube 7 with a filler having good thermal conductivity. In this case, heat conduction from the electric wire 31 to the spiral grooved tube 7 is also good.

Here, the structure of the joint 6 is not specified, but a known joint that is usually used for water supply / drainage of a house can be used as it is, but any structure having the same function can be used. Can do. Usually, there are many structures that combine rubber packing and retaining rings. For example, the joint 6 may be made of a metal such as bronze or a synthetic resin joint such as polyethylene.

Any fluid can be used as long as it does not cause deterioration of the characteristics of the synthetic resin tube or metal tube. For example, water or water added with an antifreeze solution, or a diluted organic solvent such as alcohol can be used. Moreover, although the material of the pipe 5 is not specified, a known synthetic resin material can be used in consideration of insulation and cost, and a crosslinked polyethylene pipe is particularly preferable, but a metal pipe such as copper or aluminum is also used. It is possible.

Furthermore, as shown in FIG. 4, a pipe 5 having a multilayer structure having a metal layer 12 on the inner surface and a resin layer 10 on the outer surface can be used. For example, aluminum as the metal layer 12 and polyethylene cladding as the resin layer 10 A tube or the like can also be used. If such a pipe 5 is used, it becomes possible to make the insulation and heat conductivity of the pipe 5 compatible.

When a metal is used as the material of the pipe 5, if the wire 31 is a covered wire, insulation is ensured by the covering, so that the wire 5 can be used as it is. For insulation of the electric wire 31, a resin spacer having a heat resistance higher than the heat generation temperature of the electric wire 31 may be disposed between them. Considering the ease of construction, it is preferable to use a covered wire, and considering the amount of heat generated, it is preferable to use a bare wire.

When cross-linked polyethylene is used as the material of the pipe 5, the heat exchanger 1 is manufactured as follows. First, the pipe 5 made of polyethylene before the crosslinking treatment is wound around the spiral grooved tube 7. Since the pipe 5 is before crosslinking, the winding work is easy. Next, the pipe 5 is heated in a state of being wound around the spiral grooved tube 7 to perform a crosslinking treatment. By the cross-linking treatment, the pipe 5 becomes cross-linked polyethylene, and the spiral shape of the wound pipe 5 is stabilized.

According to the heat exchanger 1 concerning this Embodiment, a highly efficient heat exchange can be performed simply. That is, in the heat exchanger 1, since the distance between the pipe 5 and the groove bottom portion 4 is short, heat generated from the electric wire 31 passing through the spiral grooved tube 7 and the fluid flowing through the pipe 5 efficiently exchange heat. be able to. In particular, when the contact portion 8 is provided, heat exchange can be performed more efficiently.

Further, since the heat exchanger 1 has a structure in which the pipe 5 is wound along the spiral groove 3 of the spiral grooved tube 7, the pipe 5 can be easily processed into a spiral shape, and the heat exchanger 1 is constructed by the spiral groove 3. The spiral pitch does not change from time to time. For this reason, the performance as originally designed can be obtained, and the design and manufacture are easy.

Further, since the spiral groove 3 reliably maintains the spiral shape of the pipe 5 and the pitch does not shift, the pitch of the pipe 5 can be narrowed in a range where the pipes 5 do not contact each other, and the unit length of the heat exchanger Since the winding length of the surrounding pipe 5 can be increased, the heat exchange efficiency can be increased.

In addition, if the pipe 5 is cross-linked polyethylene, the pipe 5 is wound around the spiral grooved tube 7 to perform the cross-linking treatment, so that the cost is low, the shape is stable, and the durability and thermal fatigue characteristics are excellent. A heat exchanger 1 can be obtained.

In addition, since the pipe 5 is accommodated in the spiral groove 3 and does not protrude from the outer periphery of the spiral grooved tube 7, the pipe 5 is in contact with the outside during transportation, handling, construction, etc. of the heat exchanger 1. Will not be damaged.

Next, the heat exchange system 50 using the heat exchanger 1 will be described. FIG. 5 is a schematic diagram of a heat exchange system 50 for underfloor heating using the heat exchanger 1. The heat exchanger 1 is embedded in the ground 9. The heat exchanger 1 can be buried deeply within a range that can withstand earth pressure, but is usually buried within a depth of 2 to 3 m.

A pipe 5 is wound around a spiral grooved tube 7 through which an electric wire 31 embedded under the ground 9 passes, and a protective tube 32 is provided around the pipe 5. Here, the spiral grooved tube 7 has two functions: a function as a protection of the electric wire 31 and a function as a cylinder for realizing a compact heat exchanger 1 by stabilizing the pitch of the pipe 5. Yes.

FIG. 6 is a schematic view of the heat exchanger 1 inserted into the protective tube 32. The protective tube 32 is particularly effective when the spiral grooved tube 7 and the pipe 5 are made of resin, and prevents the spiral grooved tube 7 and the pipe 5 embedded in the ground from being deformed or crushed by earth pressure. Have a role. For this reason, the protection tube 32 needs to be strong enough to withstand earth pressure. For example, a metal tube such as an aluminum tube or a steel tube can be used.

The protective tube 32 has a role of efficiently collecting the heat generated from the electric wire 31 without escaping to the ground. For this reason, it is better to insulate the heat exchanger 1 and the protective tube 32 as much as possible. In this case, for example, as shown in FIG. 6, the heat recovered from the electric wires 31 can be prevented from being released to the ground by filling the clearance with a heat insulating material 33.

The heat insulating material 33 only needs to withstand heat generation from the electric wire 31 and have heat insulating properties. For example, heat insulating wool or foamed resin can be used, and other materials can be appropriately selected and used depending on the design. In addition, as above-mentioned, if there is no possibility that the spiral grooved tube 7 and the pipe 5 are deformed by earth pressure in the ground, it is not necessary to use the protective tube 32 and the heat insulating material 33. Moreover, it is not necessary to use the protective tube 32 and the heat insulating material 33 when it is desired to enhance the cooling effect of the electric wire 31.

As shown in FIG. 5, the pipe 5 arranged in the heat exchanger 1a is connected to a pump 21 provided on the ground. The pump 21 circulates fluid such as water in the pipe 5. The fluid circulating in the pipe 5 exchanges heat with the electric wire 31 by the heat exchanger 1a in the ground.

The pump 21 also causes the fluid that has undergone heat exchange to flow through a pipe 23 disposed under the floor 25. Here, although the amount of heat generated by the electric wire 31 varies depending on the conditions, it is expected that the fluid after the heat exchange is about 40 to 60 ° C. due to the heat exchange with the heat generated from the electric wire 31. Therefore, the floor 25 can be heated by flowing the fluid subjected to heat exchange under the floor 25.

Here, if construction to the state where the installation of the joint 6 has been completed is completed as in the heat exchanger 1b, a larger amount of heat is required, or a new house is constructed in a remote place For example, if a pipe, a pump, or the like is connected to the joint 6 as necessary, the expansion can be easily performed, and heat can be used effectively.

In addition, although the material of the pipe 23 is not specified, for example, a steel pipe, an aluminum pipe, or a crosslinked polyethylene pipe can be used. Further, instead of the pipe 23, it is also possible to use a heat exchange pipe unit in which these pipes are sandwiched between aluminum strips having good thermal conductivity.

Further, the circulation of the fluid to the heat exchanger 1 and the circulation of the fluid to the pipe 23 under the floor 25 are made into one system by connecting the pipe 5 and the pipe 23 respectively, and the circulation is performed by one of the pumps 21. Alternatively, the pipe 5 and the pipe 23 may be circulated as separate systems using separate pumps. In this case, a heat pump or the like may be further used.

In addition, the electric wire 31 in the spiral grooved tube 7 is not necessarily one according to the design of the heat exchanger, and a plurality of different electric wires can be arranged, or one electric wire can be folded back. It can also be inserted and arranged.

In addition, one heat exchanger 1 can be provided, but a plurality of heat exchangers 1 can be provided. Usually, in order to improve the performance of the heat exchanger 1, a plurality of heat exchangers 1 are often provided. Since the heat exchanger 1 of the present invention can be made compact and does not take up much space even if a plurality of heat exchangers 1 are installed, when the number of the electric wires 31 (spiral grooved tube 7) is one, the heat exchanger 1 is arranged at a predetermined interval. It can be arranged in a straight line. Further, when there are a plurality of electric wires 31 (spiral grooved tubes 7), the heat exchanger 1 can be arranged linearly with respect to the electric wires 31 or can be arranged in parallel with each electric wire 31. . Furthermore, the heat exchangers 1 arranged in a straight line or in parallel can be used independently of each other, or can be used connected in series.

Further, as shown in FIG. 5, the heat exchanger 1 is normally used in a horizontal type because it is easy to construct when buried in the ground, but it can also be used in a vertical type if necessary. The winding length of the pipe 5 to the spiral grooved tube can be designed as appropriate, and can be wound over the entire length of the laid spiral grooved tube 7, but depending on the design of the heat exchanger, the predetermined length is set at a predetermined position. You can wind around any number of places.

As described above, according to the heat exchange system 50 using the heat exchanger 1 according to the present embodiment, heat exchange with the electric wire 31 can be easily performed with high efficiency. Moreover, what is necessary is just to dig to the depth by which the electric wire 31 is embed | buried for embedding the heat exchanger 1, and it is not necessary to dig a hole deeper than necessary.

Moreover, since the protective tube 32 is provided around the heat exchanger 1, the spiral grooved tube 7 and the pipe 5 are not deformed or crushed by earth pressure. Therefore, the designed thermal efficiency can be maintained for a long time. Moreover, if the clearance between the protective tube 32 and the heat exchanger 1 inserted therein is filled with a heat insulating material 33, the heat recovered from the electric wire 31 can be prevented from being released to the ground.

Moreover, since the heat generated by the electric wire 31 is recovered by the heat exchanger 1, the temperature suppressing effect of the electric wire 31 can be obtained, and the electric power transmission loss can be suppressed.

Heat exchange with the electric wire 31 is performed by the heat exchanger 1 and the fluid after the heat exchange is made to flow under the floor 25, whereby the floor can be efficiently heated, and a simple and energy-saving underfloor heating system is obtained. be able to.

Next, other heat exchange systems 60 to 90 using the heat exchanger 1 will be described. As an application of the present invention, an application to a heat supply system and a hot water supply system to structures such as roads, vinyl houses, and hot water pools are conceivable. The heat exchange system 60 shows a road, the heat exchange system 70 shows a vinyl house, the heat exchange system 90 shows an application example to a hot water pool, and the heat exchange system 80 shows an application example to a hot water supply system. In the following description of the heat exchanging system, constituent elements that perform the same functions as those of the heat exchanging system 50 are denoted by the same reference numerals as those in FIG.

[Heat exchange system for melting snow on the road]
FIG. 7 is a schematic diagram of a heat exchange system 60 that uses the heat exchanger 1 for the purpose of melting snow on a road or the like. The heat exchanger 1 is provided in a spiral grooved tube 7 installed on the ground. An electric wire 31 is provided in the spiral grooved tube 7, and the electric wire 31 passes through the heat exchanger 1.

The pipe 5 constituting the heat exchanger 1a is connected to a pump 21 installed on the ground. The pump 21 circulates fluid such as water in the pipe 5. The fluid circulating in the pipe 5 exchanges heat with the heat generated from the electric wires 31 by the heat exchanger 1a.

The pump 21 is bent in the horizontal direction and connected to a pipe 23 embedded under the ground 9 such as a road. Therefore, the fluid after the heat exchange can be passed through the pipe 23 by the pump 21. By flowing the fluid that has been heat exchanged with the heat generated from the electric wires 31 below the ground 9, it is possible to prevent snow melting on the road and freezing of the road.

Here, if the construction to the state where the installation of the joint 6 has been completed is completed as in the heat exchanger 1b, a larger amount of heat is required, or a new snow melting system is installed at a remote location. Even in cases, if a pipe, a pump, or the like is connected to the joint 6 as necessary, it can be easily added and heat can be used effectively.

As described above, according to the heat exchange system 60 using the heat exchanger 1 according to the present embodiment, a highly efficient heat exchange system can be easily obtained in the same manner as the effect of the heat exchange system 50. .

According to the heat exchange system 60, heat exchange with the amount of heat generated by the electric wire 31 can be performed. Therefore, since a large amount of heat can be flowed down the road, snow melting and freezing prevention on the road can be efficiently performed, and a small, simple and energy saving road snow melting system can be obtained.

[Heat exchange system for temperature control of vinyl house]
Next, the heat exchange system 70 using the heat exchanger 1 will be described. FIG. 8 is a schematic view of a heat exchanging system 70 that uses the heat exchanger 1 and aims to control the temperature of the vinyl house 35. The heat exchanger 1 is provided in a spiral grooved tube 7 provided on the ground. An electric wire 31 is provided in the spiral grooved tube 7, and the electric wire 31 passes through the heat exchanger 1.

The pipe 5 constituting the heat exchanger 1a is connected to a pump 21 installed on the ground. The pump 21 circulates fluid such as water in the pipe 5. The fluid circulating in the pipe 5 exchanges heat with the heat generated from the electric wires 31 by the heat exchanger 1a.

The pump 21 is also connected to a pipe 23 that is bent in the vinyl house 35, and the fluid that has been subjected to heat exchange can flow through the pipe 23. Therefore, the temperature inside the vinyl house 35 can be controlled by flowing the fluid that has exchanged heat with the heat generated from the electric wire 31 into the vinyl house 35.

Here, if the construction up to the state where the installation of the joint 6 has been completed is completed as in the heat exchanger 1b, a vinyl house is newly installed in a case where a larger amount of heat is required or in a remote place. Even in cases, if a pipe, a pump, or the like is connected to the joint 6 as necessary, it can be easily added and heat can be used effectively.

Thus, according to the heat exchange system 70 using the heat exchanger 1 according to the present embodiment, a high-efficiency heat exchange system can be easily obtained, similarly to the effect of the heat exchange system 50.

According to the heat exchange system 70, heat exchange with the amount of heat generated by the electric wire 31 can be performed, and a larger amount of heat can be flowed into the vinyl house 35. Therefore, the temperature control of the vinyl house 35 can be performed efficiently. It is possible to obtain a vinyl house temperature control system that is small, simple and energy saving.

[Heat exchange system for hot water preheating of water heaters]
Next, the heat exchange system 80 using the heat exchanger 1 will be described. FIG. 9 is a schematic diagram of a heat exchange system 80 that uses the heat exchanger 1 for the purpose of preheating hot water supply in the water heater 37. The heat exchanger 1 is provided in a spiral grooved tube 7 provided on the ground. An electric wire 31 is provided in the spiral grooved tube 7, and the electric wire 31 passes through the heat exchanger 1.

The pipe 5 constituting the heat exchanger 1a is connected to a pump 21 installed on the ground. The pump 21 circulates fluid such as water in the pipe 5. The fluid circulating in the pipe 5 exchanges heat with the heat generated from the electric wires 31 by the heat exchanger 1a.

The pump 21 is also connected to a pipe 23 that is connected to a water heater 37 that is a thermal device, and the fluid that has been subjected to heat exchange can flow through the pipe 23. Therefore, the hot water supply in the water heater 37 can be preheated by flowing the fluid that has exchanged heat with the heat generated from the electric wire 31 into the water heater 37.

Here, if construction to the state where the installation of the joint 6 has been completed is completed as in the heat exchanger 1b, a larger amount of heat is required, or a new house is constructed in a remote place For example, if a pipe, a pump, or the like is connected to the joint 6 as necessary, the expansion can be easily performed, and heat can be used effectively.

As described above, according to the heat exchange system 80 using the heat exchanger 1 according to the present embodiment, a highly efficient heat exchange system can be easily obtained in the same manner as the effect of the heat exchange system 50.

According to the heat exchange system 80, heat exchange with the amount of heat generated by the electric wire 31 can be performed, and a larger amount of heat can be flowed into the water heater 37, so that the hot water heater 37 can efficiently preheat hot water supply. It is possible to obtain a water heater hot water preheating system that is small, simple and energy saving.

[Heat exchange system for keeping warm water pools]
Next, the heat exchange system 90 using the heat exchanger 1 will be described. FIG. 10 is a schematic diagram of a heat exchange system 90 that uses the heat exchanger 1 and aims to keep the warm water pool warm. The heat exchanger 1 is provided in a spiral grooved tube 7 provided on the ground. An electric wire 31 is also provided in the spiral grooved tube 7, and the electric wire 31 passes through the heat exchanger 1.

The pipe 5 constituting the heat exchanger 1 is connected to a pump 21 installed on the ground. The pump 21 circulates fluid such as water in the pipe 5. The fluid circulating in the pipe 5 exchanges heat with the heat generated from the electric wires 31 by the heat exchanger 1.

A pipe 23 is connected to the pump 21, and the pipe 23 is connected to a hot water pool 39 via a filter (not shown). The pump 21 can flow the fluid after the heat exchange to the pipe 23. Therefore, the warm water pool 39 can be kept warm by flowing the fluid that has exchanged heat with the heat generated from the electric wires 31 to the hot water pool 39.

The fluid may be circulated between the hot water pool 39 and the heat exchanger 1, or a new fluid is always allowed to flow through the heat exchanger 1 and the fluid after the heat exchange is replenished to the hot water pool 39 as needed. May be.

Thus, according to the heat exchange system 90 using the heat exchanger 1 according to the present embodiment, a high-efficiency heat exchange system can be easily obtained, similarly to the effect of the heat exchange system 50.

According to the heat exchange system 90, heat exchange with the amount of heat generated by the electric wire 31 can be performed, and a larger amount of heat can be flowed to the hot water pool 39, so that the warm water pool 39 can be efficiently kept warm. Therefore, it is possible to obtain a warm water pool heat retention system that is small, simple and energy saving.

Next, the heat exchanger 30 according to the second embodiment will be described. In the following description of the embodiment, components having the same functions as those of the heat exchanger 1 are denoted by the same reference numerals as those in FIG.

FIG. 11 is a schematic view showing a heat exchanger 30 according to the second embodiment, and FIG. 11A is a perspective view showing an appearance of the heat exchanger 30 according to the present embodiment. b) is a view showing a cross section of the pipe 5 wound around the spiral grooved tube 7. The heat exchanger 30 is mainly composed of a spiral grooved tube 7, a pipe 5, an electric wire 31 and a film 14. The spiral grooved tube 7 is a tubular member having the spiral groove 3 on the outer surface.

The pipe 5 is wound along the spiral groove 3 on the outer surface of the spiral grooved tube 7, and an electric wire 31 is passed through the spiral grooved tube 7. The periphery of the spiral grooved tube 7 around which the pipe 5 is wound is covered with a film 14. Here, the film 14 has the effect of protecting the pipe 5 from the outside and insulating the heat exchanger 1. The film 14 may be one in which a cloth film is provided on the outer surface of the heat insulating material. By doing in this way, while improving the heat insulation of a film, the intensity | strength of a film can also be improved. Joints 6 are provided at both ends of the pipe 5 and connected to a pump or the like. A fluid which is a heat medium flows inside the pipe 5.

In FIG. 11A, when a fluid is caused to flow in the pipe 5 from the direction A, the fluid flows in the pipe 5 spirally wound along the spiral groove 3 around the spiral grooved tube 7 and spirals. When it flows to the end of the grooved tube 7, it flows out in the B direction. Here, when the electric wire 31 is energized, heat is generated according to the current flowing through the electric wire 31 and the electric resistance value of the electric wire 31. Therefore, the heat exchanger 30 can exchange heat between the heat generated from the electric wire 31 and the fluid flowing around the spiral grooved tube 7.

Here, in order to obtain a more efficient heat exchanger 30, it is desirable to bring the pipe 5 and the bottom of the spiral grooved tube 7 (spiral groove 3) closer to each other. The outer diameter of the pipe 5 (when the pipe 5 is deformed when it is wound around the spiral grooved tube 7, the diameter of the pipe 5 after deformation in the depth direction of the spiral groove 3) is the depth of the spiral groove 3. Smaller is better than that. That is, it is desirable that the pipe 5 is accommodated in the spiral groove 3 and the pipe 5 does not protrude from the outer peripheral surface of the spiral grooved tube 7 (the top of the spiral groove 3). This is to enhance the effect of protecting the pipe 5 by the film 14 and the heat insulating effect of the heat exchanger 30.

The film 14 may be a material having strength, heat insulation (low thermal conductivity), and extensibility. For example, a film made of polyethylene, a crosslinked polyethylene, or a polypropylene can be used as the film material. . Moreover, when using what provided the cloth film in the outer surface of a heat insulating material as a protective film, as a heat insulating material, the outer side of heat insulating layers, such as foaming polyethylene, foaming polypropylene, and foaming urethane, are made of polyethylene, polypropylene, etc. It is possible to use a plastic fiber covered with a cloth film knitted in a mesh shape.

According to the heat exchanger 30 according to the present embodiment, the same effect as the heat exchanger 1 can be obtained. That is, the heat exchanger 30 can efficiently exchange heat between the heat generated from the electric wire 31 penetrating the spiral grooved tube 7 and the fluid flowing in the pipe 5.

Further, since the film 14 covers the whole, the pipe 5 does not come into contact with the outside during transportation, handling, construction, etc. Therefore, the pipe 5 is not damaged. The film 14 also has a heat insulating effect of the heat exchanger 30. That is, the heat generated from the electric wire 31 can be prevented from being released to the outside. Here, if the pipe 5 does not protrude from the outer periphery of the spiral grooved tube 7, the film 14 and the pipe 5 do not contact each other, and these effects can be obtained more efficiently.

Next, a heat exchanger according to a third embodiment will be described. The heat exchanger according to the third embodiment has substantially the same structure as that of the heat exchanger 1, but the gap between the spiral groove 3 and the pipe 5 is filled with the heat conducting medium 16. FIG. 12 is a view showing a cross section of the pipe 5 in a state wound around the spiral grooved tube 7 in the heat exchanger according to the third embodiment.

As a form in which the gap between the spiral groove 3 and the pipe 5 is filled with the heat conducting medium 16, for example, as shown in FIG. That is, when the pipe 5 and the spiral groove 3 have substantially the same width, the space formed by the spiral groove 3 and the pipe 5 may be filled with the heat conducting medium 16. In this case, the pipe 5 is in line contact with the groove bottom 4 of the spiral groove 3, but the contact area between the pipe 5 and the spiral groove 3 can be indirectly increased by the heat conduction medium 16.

Further, as shown in FIG. 12B, the diameters of the pipe 5 and the spiral groove 3 are greatly different, the pipe 5 is in line contact with the groove bottom 4 of the spiral groove 3, and the pipe 5 and the spiral groove 3 Even when the space is not formed, the heat conduction medium 16 may be filled in the gap between the pipe 5 and the spiral groove 3 as in FIG. In this case, the contact area between the pipe 5 and the spiral groove 3 can be indirectly increased by the heat conduction medium 16, and further, the pipe 5 can be prevented from moving in the spiral groove 3.

Further, as shown in FIG. 12 (c), even when the pipe 5 and the groove bottom portion 4 of the spiral groove 3 are not in contact, the space formed by the pipe 5 and the spiral groove 3 is filled with the heat transfer medium 16. do it. Although the pipe 5 and the groove bottom 4 are not in direct contact with each other, the pipe 5 and the spiral groove 3 can be brought into contact indirectly by filling the gap with the heat conducting medium 16. Further, even when the pipe 5 and the spiral groove 3 are not in direct contact with each other, that is, when the heat conductive medium 16 is filled between the pipe 5 and the spiral groove 3 to form a heat conductive medium layer. Even so, the pipe 5 and the spiral groove 3 are indirectly in contact with each other, and the same effect can be obtained.

Here, as the heat conductive medium 16, it is sufficient if it has a high heat conductivity and can fill the gap between the pipe 5 and the spiral groove 3. For example, heat conductive cement or heat conductive grease can be used.

According to the heat exchanger concerning this Embodiment, the effect similar to the heat exchanger 1 can be acquired. That is, heat generated from the electric wire 31 penetrating the spiral grooved tube 7 and the fluid flowing in the pipe 5 can efficiently exchange heat.

In particular, the pipe 5 and the groove bottom 4 can indirectly obtain a large contact area with the heat conducting medium 16, and the heat generated by the electric wires 31 can be more efficiently exchanged. In addition, since the pipe 5 after being wound around the spiral grooved tube 7 by the heat conduction medium 16 does not move or deform in the spiral groove 3, stable heat exchange efficiency can be maintained. it can.

Next, a heat exchanger according to a fourth embodiment will be described. The heat exchanger according to the fourth embodiment has substantially the same structure as the heat exchanger 1, but a plurality of pipes 5 are wound around one spiral groove 3. FIG. 13 is a view showing a cross section of the pipe 5 in a state wound around the spiral grooved tube 7 in the heat exchanger according to the fourth embodiment.

FIG. 13A is effective when the spiral groove 3 is wide and shallow, and the pipe 5 is wound around the spiral groove 3 in parallel in two rows. In this case, the number of turns of the pipe 5 (the winding length of the pipe 5) with respect to the unit length of the spiral grooved tube 7 can be increased, and the pipe 5 does not protrude from the spiral groove 3. Note that the number of windings of the pipe 5 around one spiral groove 3 may be three or more according to the width and depth of the spiral groove 3.

Similarly, FIG. 13B is effective when the width of the spiral groove 3 is narrow and deep, and the pipe 5 is wound around the spiral groove 3 in two stages. Also in this case, the number of turns of the pipe 5 (the winding length of the pipe 5) with respect to the unit length of the spiral grooved tube 7 can be increased. Note that the number of windings of the pipe 5 around one spiral groove 3 may be three or more depending on the width and depth of the spiral groove 3.

According to the heat exchanger concerning this Embodiment, the effect similar to the heat exchanger 1 can be acquired. That is, heat generated from the electric wire 31 penetrating the spiral grooved tube 7 and the fluid flowing in the pipe 5 can efficiently exchange heat.

In particular, since a plurality of pipes 5 are wound around one spiral groove 3, the number of turns of the pipe 5 per unit length of the spiral grooved pipe 7 (the winding length of the pipe 5) can be increased. The generated heat can be exchanged more efficiently.

As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

For example, although the heat exchange 1 is installed sideways, it may be installed vertically depending on the direction of the electric wires 31. Moreover, in the heat exchange system 60-90 shown to FIGS. 7-10 using the heat exchanger 1, according to the installation place of the electric wire 31, the installation place of the heat exchanger 1 may be underground, Moreover, when the installation place of the electric wire 31 is underground, you may use the protective tube 32 and the heat insulating material 33 further. Further, in the heat exchange system 90, the hot water pool 39 may be kept warm by bending the pipe 23 horizontally below the hot water pool 39 and flowing the heat exchanged fluid through the pipe 23. Moreover, in the heat exchange systems 50-90, you may use the heat exchanger concerning other embodiment other than the heat exchanger 1. FIG.

The perspective view which shows the external appearance of the heat exchanger 1 concerning this Embodiment. The perspective view which shows the pipe 7 with a spiral groove. FIG. 6 is a cross-sectional view showing the relationship between the spiral grooved tube 7 and the pipe 5, where (a) is a diagram showing a case where the outer diameter of the pipe 5 and the groove width of the spiral groove 3 are substantially the same; The figure which shows the case where the curvature in is substantially the same as the curvature of the groove bottom part 4 of the spiral groove 3, (c) is a figure which shows the state by which the pipe 5 deform | transformed and was wound around the spiral groove 3. FIG. Sectional drawing of the pipe 5 which consists of a multilayer structure which has a metal layer and a resin layer. Schematic which shows the heat exchange system 50 for the purpose of underfloor air conditioning using the heat exchanger 1. FIG. The figure which shows the state which used the protective tube 32 and the heat insulating material 33 for the heat exchanger 1. FIG. Schematic which shows the heat exchange system 60 aiming at the snow melting of a road. Schematic which shows the heat exchange system 70 aiming at the temperature control of the vinyl house 35. FIG. Schematic which shows the heat exchange system 80 aiming at the preheating of the hot water supply of the water heater 37. FIG. Schematic which shows the heat exchange system 90 aiming at the thermal insulation of the warm water pool 39. FIG. It is a figure which shows the heat exchanger 30 concerning 2nd Embodiment, (a) is a perspective view which shows the external appearance of the heat exchanger 30, (b) is a cross-sectional enlarged view of the spiral grooved tube 7 and the pipe 5. FIG. The figure which shows the state with which the heat conductive medium was filled between the spiral grooved pipe | tube 7 and the pipe 5 in the heat exchanger which concerns on 3rd Embodiment. The figure which shows the state by which the several pipe 5 was wound around the one spiral groove 3 by sectional drawing of the spiral grooved pipe | tube 7 and the pipe 5 in the heat exchanger which concerns on 4th Embodiment.

Explanation of symbols

1, 30 ......... Heat exchanger 3 ... ... Spiral groove 4 ... ... Groove bottom 5 ... ... Pipe 6 ... ... Joint 7 ... ... Spiral grooved tube 8 ... ... Contact part 9 ... ... Ground 10 ......... Resin layer 11 ......... Groove depth 12 ......... Metal layer 13 ......... Groove depth center 14 ......... Film 16 ...... Heat conduction medium 21 ......... Pump 23 ......... Pipe 25 ……… Floor 31 ……… Wire 32 ……… Protection tube 33 ……… Insulation 35 ……… Vinyl house 37 ……… Water heater 39 ……… Hot water pool 50, 60, 70, 80, 90 ……… Heat exchange system

Claims (13)

A spiral grooved tube having a spiral groove on the outer surface;
A pipe wound along the groove of the spiral grooved tube;
An electric wire penetrating the inside of the spiral grooved tube;
Comprising
The outer diameter of the pipe wound around the spiral grooved tube is substantially the same as or smaller than the groove width of the groove when the pipe is wound,
A heat exchanger for flowing a fluid through the pipe. The heat exchanger according to claim 1, wherein a heat conduction medium is filled in a gap between the pipe and the groove. The heat exchanger according to claim 1 or 2, wherein the curvature at the outer diameter of the pipe and the curvature at the bottom of the groove are substantially the same. The outer diameter of the pipe is smaller than the depth of the groove, and the pipe wound around the spiral grooved tube does not protrude from the outer peripheral surface of the spiral grooved tube. The heat exchanger according to claim 3. The heat exchanger according to any one of claims 1 to 4, wherein a film is wound around an outer peripheral surface of the spiral grooved tube around which the pipe is wound. The heat exchanger according to any one of claims 1 to 5, wherein a plurality of the pipes are wound around one groove. The heat exchanger according to any one of claims 1 to 6, wherein the spiral grooved tube is made of resin. The heat exchanger according to any one of claims 1 to 7, wherein the pipe is made of resin. The heat exchanger according to any one of claims 1 to 7, wherein the pipe is made of metal. The heat exchanger according to any one of claims 1 to 7, wherein the pipe has a multilayer structure having a resin layer and a metal layer. A pipe is wound along the groove of a spiral grooved tube having a spiral groove on the outer surface, and the outer diameter of the pipe wound around the spiral grooved tube is equal to the outer diameter of the pipe wound around the pipe. A heat exchanger through which an electric wire penetrates the inside of the spiral grooved tube around which the pipe is wound is substantially the same as or smaller than the groove width of the groove, and the fluid flowing in the pipe is supplied from the electric wire. A heat exchange system characterized by exchanging heat with generated heat. The heat exchange system according to claim 11, wherein the fluid that has undergone heat exchange is caused to flow through a structure, and heat of the fluid is used for the structure. The heat exchange system according to claim 11, wherein the heat of the fluid that has undergone heat exchange is used for preheating of a thermal device.

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