JP7374776B2 - heat exchange system - Google Patents

Description

The present invention relates to heat exchange systems.

Conventionally, the increase in temperature of road surfaces has not only been considered as one of the causes of the heat island phenomenon, but also a factor that reduces the durability of roads. As countermeasures against such high temperatures on road surfaces, it is known to change existing concrete pavements and asphalt pavements to water-retaining pavements, and to water roads using reclaimed sewage water.
In addition, as a method for recovering heat from the road surface as a countermeasure against the heat island phenomenon, for example, as shown in Patent Document 1, a fluid is sent to the road surface layer and heat exchange is performed between the road surface and the fluid. There are ways to cool it down.

Patent Document 1 discloses a road cooling/snow melting system that cools or heats groundwater pumped up from a production well by supplying it to a surface layer consisting of an aquifer provided in a road pavement section, in which the road pavement section An inlet that introduces fluid into the surface layer, a feed channel that supplies groundwater pumped up from a production well to the inlet, a discharge section that discharges fluid that has been supplied to the surface layer and exceeds a certain amount, and the discharge A configuration is described in which a discharge channel is provided to guide fluid from the drain to a reinjection well or a sewage channel.

Japanese Patent Application Publication No. 2007-046331

However, the method of recovering road surface heat as shown in Patent Document 1 requires a pump to pump and circulate fluid, so it is necessary to recover road surface heat without power. There was room for improvement in that respect.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a heat exchange system that can efficiently reduce the temperature of a heat recovery section without using power.

In order to achieve the above object, a heat exchange system according to the present invention is a heat exchange system capable of exchanging thermal energy between a heat recovery section and a heat radiation section, and a heat exchange system that is arranged in contact with the heat recovery section. a heat pipe having a first evaporation section and a first condensation section; and a circular heat exchange device arranged in contact with the heat radiation section, having a second evaporation section and a second condensation section, and formed in an annular shape, The first condensing part of the heat pipe and the second evaporating part of the circulation heat exchange device have a heat exchange part in which they contact each other so as to be able to transfer heat, and the heat pipe has a heat medium inside the pipe. The first evaporator is disposed underground so as to exchange heat with the environment around the tube by enclosing it, and the first evaporator of the heat pipe recovers thermal energy, and the thermal energy is transferred to the first evaporator. The circulating heat exchange device is formed of only annular piping in which a heat medium is sealed in a tube and the heat medium is circulated, and the circulation heat exchange device is a first circulation path for cooling while going from the condensation section to the second evaporation section; and a second circulation path for vaporized vapor in the second evaporation section to move while going from the second evaporation section to the second condensation section. The second evaporation section, the second condensation section, and the second circulation path in which the heat exchange section is located are arranged on the ground, and the first condensation section of the heat pipe is provided with a The second evaporator is characterized in that it is in contact with a region of the second evaporator that includes a water surface of the heat medium enclosed in the circulation heat exchange device.

In the heat exchange system according to the present invention, thermal energy recovered from the heat recovery section in the first evaporation section of the heat pipe is transferred from the first condensation section to the second evaporation section of the circulation heat exchange device via the heat exchange section. be done. Then, the heat medium in the circulation heat exchange device is evaporated in the second evaporation section by the heat supplied from the heat exchange section, a circulation flow is generated in the heat medium, and the transferred vapor is condensed in the second condensation section and becomes a fluid. By returning, heat exchange takes place. For example, by arranging the first evaporation part of the heat pipe on the road surface, which is the heat recovery part, and arranging at least a part of the circulation heat exchange device in the waste water in the sewage pipe, which is the heat radiating part, heat from the road surface can be transferred to the heat pipe. The recovered heat can be recovered without power, and the recovered heat can be radiated to waste water without power using an annular circulation heat exchange device.

Furthermore, in the heat exchange system of the present invention, by adjusting the amount and pressure of the medium sealed in the heat pipe, the heat recovery by the heat pipe is automatically stopped when the temperature of the heat recovery section drops to a predetermined temperature. Furthermore, when the temperature of the heat recovery section rises to a predetermined temperature, heat recovery by the heat pipe can be automatically started.

Furthermore , since the heat recovered by the heat pipe in the heat exchange section can be directly transferred to the area containing the water surface of the heat medium enclosed in the circulation heat exchange device, the second evaporator of the circulation heat exchange device The heat medium can be efficiently evaporated in the heat transfer section, and heat exchange can be performed with high thermal efficiency.

Further, in the heat exchange system according to the present invention, the circulation heat exchange device is cooled in the first circulation path between the second condensing section and the second evaporation section in the circulation direction of the heat medium; At least a part of the second circulation path from the second evaporating section to the second condensing section may be thermally insulated.

In this case, since at least a portion of the second circulation path of the circulation heat exchange device is insulated, the influence of external temperature can be suppressed. That is, it is possible to prevent the second circulation path itself from becoming high temperature due to the outside air becoming high temperature in summer, and it is possible to suppress a decrease in heat exchange efficiency.

Further, the heat exchange system according to the present invention may be characterized in that the heat recovery section is a roadbed, and the heat radiating section is drainage inside a drainage storage facility buried underground.

In this case, the underground drainage water, which has a significantly lower temperature than the outside air in the summer, becomes the heat radiating part in which the circulation heat exchange device is arranged, so that effective heat exchange can be performed.

According to the heat exchange system of the present invention, by using a combination of heat exchange that recovers heat from heat recovery parts such as roadbeds, and heat exchange that radiates the recovered heat to sewage, domestic wastewater, or the ground, it is possible to operate without power. The temperature of the heat recovery section can be efficiently reduced.

1 is a longitudinal cross-sectional view showing the configuration of a heat exchange system according to an embodiment of the present invention. FIG. 2 is an enlarged view of a main part of the heat exchange system of FIG. 1, and is a longitudinal cross-sectional view showing a connection state between a heat supply section of a heat pipe and a circulation heat exchange device.

Hereinafter, a heat exchange system according to an embodiment of the present invention will be described based on the drawings.

The heat exchange system 1 according to the present embodiment shown in FIG. ) is a system that allows thermal energy to be exchanged between That is, the heat from the road surface 10a of the roadbed 10 is recovered and the heat is radiated to the waste water W.
In the sewer pipe 2 through which the waste water W flows, which is the heat radiating part of the heat exchange system 1 of the present embodiment, the waste water W such as rainwater or household waste water flows and is stored in a flowing state.

The heat exchange system 1 includes a heat pipe 3 that is placed in contact with a roadbed 10 and has a first evaporation section 3A and a first condensation section 3B, and a heat pipe 3 that is placed in contact with waste water W and has a second evaporation section 4A and a second condensation section. 4B, and a circular heat exchange device 4 formed in an annular shape. The heat exchange system 1 includes a heat exchange section P in which the first condensing section 3B of the heat pipe 3 and the second evaporation section 4A of the circulation heat exchange device 4 are in contact with each other so as to be able to transfer heat.

As shown in FIG. 2, the heat pipe 3 is formed into a rod shape, and is used to exchange heat with the environment around the pipe by enclosing a heat medium 31 inside the pipe. The heat pipe 3 recovers thermal energy from the road surface 10 at the first evaporating section 3A at one end in the length direction, and the thermal energy is transmitted to the first condensing section 3B at the other end. In this embodiment, the heat pipe 3 is buried in a shallow roadbed 10, for example, about 0.1 to 2 m above the ground, with the first evaporator 3A facing horizontally.
As the heat medium 31 sealed in the tube of the heat pipe 3, a liquid such as water, ethanol, aqueous ammonia, etc. is used.

The first condensing section 3B of the heat pipe 3 is provided with each section communicating with each other via a connecting section 3C extending obliquely upward from the first evaporating section 3A, and is connected to the circulation heat exchange device 4 which is the heat exchange section P. It is provided in a state in which it is in contact with the second evaporator section 4A on the outer circumferential surface 42a of the first vertical pipe 42A located above ground so as to be able to transfer heat. The first condensing section 3B is in contact with a region of the second evaporating section 4A that includes the water surface 41a of the heat medium 41 enclosed in the circulation heat exchange device 4.

The first condensing part 3B only needs to be in contact with the outer circumferential surface 42a of the first vertical pipe 42A at the heat exchange part P, but the viewpoint is that higher temperature heat can be imparted from the first condensing part 3B to the first vertical pipe 42A. Therefore, it is preferable that the contact area of the first condensing section 3B is small.
In addition, as a structure of the 1st condensation part 3B, it may be formed in the cylindrical shape which externally fits on the outer peripheral surface 42a of 42 A of 1st vertical pipes, for example.

In the first evaporation section 3A, the heat medium 31 inside the tube absorbs heat from the roadbed 10 outside and evaporates, thereby collecting heat. The steam evaporated by the heat extraction moves at high speed toward the first condensing section 3B due to the pressure difference between the steam. Then, in the first condensing section 3B, the steam releases latent heat of condensation and liquefies by transferring heat to the circulation heat exchange device 4 in the heat exchange section P, and the liquid is refluxed by gravity. That is, the liquid of the heat medium 31 moves from the first condensing section 3B to the first evaporating section 3A.

As shown in FIG. 1, the circulation heat exchange device 4 has a heat medium 41 sealed in a tube, and is formed in an annular shape so that the heat medium 41 is circulated in a circulation direction (direction indicated by symbol E shown in FIGS. 1 and 2). This is the piping that has been installed. The circulation heat exchange device 4 is provided with a first circulation path 4C that cools while going from the second condensation section 4B to the second evaporation section 4A in the circulation direction E, and a first circulation path 4C that cools the passage from the second evaporation section 4A to the second condensation section in the circulation direction E. A second circulation path 4D is provided in which the vapor vaporized in the second evaporation section 4A moves while heading to the section 4B. Here, in this embodiment, the second evaporation section 4A, the second condensation section 4B, and the second circulation path 4D in which the heat exchange section P is located are arranged on the ground.

The first circulation path 4C has a cooling section 43 through which the waste water W of the sewer pipe 2 passes. The first circulation path 4C and the second circulation path 4D include a first vertical pipe 42A that extends in the vertical direction and in which the second evaporation section 4A is arranged, and a first vertical pipe 42A that extends in the vertical direction and in which the second condensation section 4B is arranged. 2 vertical piping 42B. The first vertical pipe 42A and the second vertical pipe 42B are arranged in parallel. The circulation heat exchange device 4 is configured to adjust the water level of the heat medium 41 in the first vertical pipe 42A (height of the first water surface 41a) and the water level of the heat medium 41 in the second vertical pipe 42B (height of the second water surface 41b). ) are trying to maintain the same position.
As the heat medium 41 sealed in the tubes of the circulating heat exchange device 4, liquids such as water, ethanol, and aqueous ammonia are used.

Furthermore, in the circulation heat exchange device 4, the pressure inside the tubes is reduced below atmospheric pressure, and the boiling point of the heat medium 41 is set low. Thereby, the heat medium 41 evaporates at a temperature lower than the boiling point of the fluid at atmospheric pressure.
As shown in FIG. 1, a spiral cooling part 43 is formed in the first circulation path 4C at a portion that contacts the waste water W as described above. The cooling unit 43 is formed in a spiral shape centered on the flow direction of the waste water W, so that the contact area with the waste water W is increased and the thermal efficiency of heat radiation is enhanced.

Further, the circulation heat exchange device 4 moves along the circulation direction E from the heat exchange section P (second evaporation section 4A) with which the first condensation section 3B of the heat pipe 3 contacts, to the second condensation section 4B (second water surface 41b). At least a portion of the second circulation path 4D up to the second circulation path 4D is insulated by being covered with a heat insulating material (not shown) or the like.

Next, the operation of the heat exchange system 1 described above will be explained in detail based on the drawings.
In the heat exchange system 1 according to the present embodiment, as shown in FIG. 1, thermal energy recovered by the first evaporation section 3A of the heat pipe 3 from the roadbed 10, which is a heat recovery section, is heat exchanged from the first condensation section 3B. The heat is transmitted to the second evaporation section 4A of the circulation heat exchange device 4 via the section P. Then, the heat medium 41 in the circulation heat exchange device 4 evaporates (steam E1 shown in FIG. 2) at the first water surface 41a due to the heat supplied from the heat exchange part P, and a circulating flow is generated in the heat medium 41. By supplying heat to the second water surface 41b (heat medium 41) of the second vertical pipe 42B located on the opposite side to the first water surface 41a of the heat medium 41 in the first vertical pipe 42A, the transferred steam Heat exchange is performed by condensing E1 in the second condensing section 4B and returning to a fluid (fluid E2 shown in FIG. 2).

At this time, in the heat exchange system 1, the heat medium 41 in the first vertical pipe 42A is evaporated by the heat supplied from the heat pipe 3 in the heat exchange part P (second evaporation part 4A), so that the heat medium 41 in the first vertical pipe 42A is temporarily evaporated. Although the position of the first water surface 41a is lowered, it is not equal to the height of the second water surface 41b of the heat transfer medium 41 existing in the second vertical pipe 42B located in the second condensation section 4B on the opposite side from the second evaporation section 4A. Because of the force acting to reduce heat, a circulating flow is generated within the circulating heat exchange device 4.
While this circulating flow is occurring, heat exchange is performed between the heat medium 41 and the waste water W in the first circulation path 4C (mainly the cooling section 43) located in the waste water W in the sewage pipe 2.

Therefore, as in the present embodiment, the first evaporation section 3A of the heat pipe 3 is arranged on the roadbed 10, which is a heat recovery section, and the first circulation path 4C of the circulation heat exchange device 4 is arranged on the waste water W, which is a heat radiation section. By doing so, the heat of the roadbed 10 can be recovered by the heat pipe 3 without using power, and the heat can be radiated to the waste water W of the sewage pipe 2.

Furthermore, in the heat exchange system 1 according to the present embodiment, the first condensing section 3B of the heat pipe 3 comes into contact with a region (second evaporating section 4A) including the position of the first water surface 41a of the heat medium 41 of the circulating heat exchange device 4. are doing. Therefore, the heat recovered by the heat pipe 3 in the heat exchange section P can be directly transferred to the first water surface 41a of the heat medium 41 enclosed in the circulation heat exchange device 4, so that The heat medium 41 can be efficiently evaporated at 4A, and heat exchange can be performed with high thermal efficiency.

Further, in the present embodiment, in the circulation heat exchange device 4, at least a part of the second circulation path 4D from the second evaporation section 4A to the second condensation section 4B is insulated. . In other words, the portion of the circulating heat exchange device 4 where the heat medium 41 is vaporized is insulated, so that the influence of external temperature can be suppressed. That is, it is possible to prevent the second circulation path 4D itself from becoming high temperature due to the outside air becoming high temperature in the summer, and it is possible to suppress a decrease in heat exchange efficiency.

Furthermore, in this embodiment, the underground waste water W, which has a significantly lower temperature than the outside air in the summer, serves as a heat dissipation section in which the circulation heat exchange device 4 is disposed, so that effective heat exchange can be performed.

As described above, in the heat exchange system 1 according to the present embodiment, the heat pipe 3 that recovers heat from the roadbed 10 and the circulation heat exchange device 4 that radiates the recovered heat to sewage, domestic wastewater, or the ground are used together. , it is possible to efficiently reduce road surface temperature without power.

Although the embodiments of the heat exchange system according to the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be modified as appropriate without departing from the spirit thereof.

For example, in the present embodiment, the first condensing section 3B of the heat pipe 3 is located in a region (second evaporating section 4A) that includes the position of the first water surface 41a of the heat medium 41 in the first vertical pipe 42A in the circulation heat exchange device 4. However, the contact position between the first condensing part 3B and the second evaporating part 4A in the heat exchange part P is an area including the position of the first water surface 41a of the heat medium 41 in the first vertical pipe 42A. Don't be limited by one thing. In short, if heat is transferred from the first condensing part 3B in contact with the first vertical pipe 42A in the heat pipe 3 to the first water surface 41a of the heat medium 41 in the first vertical pipe 42A within a range where it can be evaporated. It is sufficient that the first condensing section 3B of the heat pipe 3 is in contact with the vicinity of the first water surface 41a of the heat medium 41 in the first vertical pipe 42A.

Further, in the circulation heat exchange device 4, the installation range of the heat insulating material provided in the second circulation path 4D can be set as appropriate.

Furthermore, in the present embodiment, the heat dissipation section of the circulation heat exchange device 4 is directed to the waste water W stored in the sewer pipe 2 (waste water storage equipment), but the present invention is not limited to this. For example, the sewage pipe 2 may be replaced with a water tank, and the waste water stored in the water tank may be used as the heat radiating part. Also, river water may be used as a heat dissipation part. Furthermore, it is also possible to use the ground as the heat dissipation part instead of water.

Further, the installation position, shape, size, length, and other configurations of the heat pipe 3 and the circulation heat exchange device 4 may be optimally designed in consideration of conditions such as the size of the space of the heat recovery section.

In addition, it is possible to appropriately replace the components in the above-described embodiments with well-known components without departing from the spirit of the present invention.

1 Heat exchange system 2 Sewer pipe (wastewater storage equipment)
3, 3C Heat pipe 3A First evaporation section 3B First condensation section 4 Circulating heat exchange device 4A Second evaporation section 4B Second condensation section 4C First circulation path 4D Second circulation path 10 Roadbed (heat recovery section)
10a Road surface 31 Heat medium of heat pipe 41 Heat medium of circulation heat exchange device 42A First vertical pipe 42B Second vertical pipe 42a Outer surface 43 Cooling part P Heat exchange part W Drainage (heat radiation part)

Claims (3)

A heat exchange system capable of exchanging thermal energy between a heat recovery section and a heat radiation section,
a heat pipe disposed in contact with the heat recovery section and having a first evaporation section and a first condensation section;
a circulating heat exchange device disposed in contact with the heat radiation section, having a second evaporation section and a second condensation section, and formed in an annular shape;
The first condensing part of the heat pipe and the second evaporating part of the circulation heat exchange device have a heat exchange part in which they are in contact with each other so as to be able to transfer heat,
In the heat pipe, the first evaporation section is disposed underground so as to exchange heat with the environment around the tube by sealing a heat medium inside the tube,
recovering thermal energy in the first evaporating section of the heat pipe, and transmitting the thermal energy to the first condensing section;
The circulating heat exchange device is formed of only annular piping in which a heat medium is enclosed in a pipe and the heat medium is circulated,
The circulation heat exchange device includes a first circulation path for cooling while going from the second condensing section to the second evaporation section, and a second circulation path for cooling while going from the second evaporation section to the second condensation section. a second circulation path through which the vaporized vapor moves;
The second evaporation section, the second condensation section, and the second circulation path in which the heat exchange section is located are arranged on the ground,
The first condensing section of the heat pipe is in contact with a region of the second evaporating section that includes a water surface of the heat medium enclosed in the circulating heat exchange device. The circulating heat exchange device includes:
Cooled in a first circulation path between the second condensing section and the second evaporation section in the circulation direction of the heat medium,
The heat exchange system according to claim 1, wherein at least a portion of the second circulation path from the second evaporation section to the second condensation section in the circulation direction is insulated. The heat recovery section is a roadbed,
3. The heat exchange system according to claim 1 , wherein the heat radiating section is waste water inside a waste water storage facility buried underground.

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