JP2514425Y2 - Structure of soil heat storage - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a soil heat storage section that stores heat energy in a retrievable manner.

[0002]

2. Description of the Related Art It has been considered that solar heat, surplus heat, etc. should be accumulated and taken out when necessary, for example, during the snow season in winter and used as a heat source for road snow melting. Soil may be used as a heat storage material for storing heat.

For example, the specification of the application attached to the application of Japanese Patent Application No. 2-321503 shows an example in which a part of the embankment of an expressway is used as a heat storage unit of a snow melting facility.

As shown in FIG. 3, a soil heat storage section 3 is installed below a road surface 2 of a highway 1 constructed by embankment. Is filled with soil 5 having a predetermined water content as a heat storage material. In the highway 1, the south-facing slope 6 on the road side serves as a solar heat collecting part, and the evaporating part 7a of the heat pipe 7 is buried in this slope 6 and the condensing part 7 of this heat pipe 7 is embedded.
b is arranged in the soil 5 of the soil heat storage section 3. Furthermore, in the soil 5 of the soil heat storage unit 3, a hot water circulation pipe 8 is provided, a part of which is arranged immediately below the road surface 2 above the soil heat storage unit 3, to heat the soil heat storage unit 3 from a wide range. It is arranged so that it can be absorbed.

Then, the south-facing slope 6 of the highway 1
When the temperature rises due to the irradiation of sunlight, the heat pipe 7
Is heated, the heat energy thereof is transported into the soil heat storage unit 3 and accumulated in the soil 5.

The heat thus stored in the soil heat storage section 3 is used for heating the hot water flowing through the hot water circulation pipe 8 in the winter season, and the heated hot water circulates so that the road surface 2 Snow melting and freeze prevention are performed.

[0007]

In the case of the soil heat storage section 3 of the snow melting device described above, hot water is circulated in the hot water circulation pipe 8 to collect heat from the soil heat storage section 3, and the hot water is heated at a high speed. Melting snow on road 1. And
The warm water that has been used for snow melting and has decreased in temperature is again stored in the soil heat storage unit 3.
While flowing through the hot water circulation pipe 8 disposed inside, heat is absorbed from the surrounding soil 5 and the temperature rises. As a result, the temperature of the hot water flowing while absorbing heat from the surroundings gradually rises.

Therefore, the temperature of the hot water flowing through the hot water circulation pipe 8 arranged in the soil heat storage section 3 is low on the upstream side, which is the inlet side of the soil heat storage section 3, and increases as it flows downstream. , And becomes the highest at the outlet from the soil heat storage section 3 on the most downstream side. Therefore, the temperature of the soil in the soil heat storage unit 3 is low on the upstream side of the hot water circulation pipe 8 through which low-temperature hot water flows, because the temperature is low, and on the downstream side of the hot water circulation pipe 8, the hot water flowing is low. The soil temperature rises because the amount of heat absorbed at high temperatures is small.
As a result, uneven temperature occurs in the soil heat storage section 3,
There is a problem that the heat collection efficiency of the hot water circulation pipe 8 is reduced.

The present invention has been made in view of the above circumstances, and provides a structure of a soil heat storage part capable of improving the heat collection efficiency by correcting the temperature unevenness of the soil heat storage part to equalize the temperature. Is intended.

[0010]

[Means for Solving the Problems] As a means for solving the above problems, the present invention provides a hot water circulation pipe between a soil part for storing heat and a heat radiating part for consuming heat, and supplies water to the hot water pipe. In the structure of the soil heat storage part that circulates and collects heat from the soil part, a heat pipe is provided in the soil, one end side of which is arranged on the downstream side of the hot water circulation pipe and the other end side is arranged on the upstream side. Is characterized by.

Further, the heat pipe arranged in soil may be provided so that the downstream side of the hot water circulation pipe is low and the upstream side thereof is high.

It is also possible to provide an opening / closing valve at a lower position of the condensing part of the inclined heat pipe and to provide a reservoir tank at a position higher than this opening / closing valve.

[0013]

As described above, since the heat pipe is provided in the soil of the soil heat storage unit by arranging one end side thereof on the downstream side of the hot water circulation pipe and the other end side thereof on the upstream side, the heat storage pipe is taken from the soil heat storage unit. When heat is removed from the soil portion during heating, temperature unevenness occurs in which the temperature of the soil around the upstream side of the hot water circulation pipe becomes lower than the temperature of the soil around the downstream side.
As a result, of the heat pipe, the part disposed in the high temperature soil on the downstream side becomes the evaporation part, and the part disposed in the low temperature soil on the upstream side becomes the condensation part. Is transferred to the low temperature side, the temperature of the entire soil heat storage part is equalized, and the heat collection efficiency of the hot water circulation pipe is improved.

If the heat pipe arranged in the soil is provided so that the downstream side of the hot water circulation pipe is low and the upstream side thereof is high, the heat pipe can be efficiently operated in a so-called bottom heat state in which the evaporator side is low. In addition, a heat pipe having a simple structure without a wick can be used.

If an on-off valve is provided at a lower position of the condenser portion of the inclined heat pipe and a reservoir tank is provided at a higher position than this on-off valve, the on-off valve is closed to close the on-off valve. The section can be heat pipe operated. At this time, the reservoir tank portion becomes the evaporation portion.

[0016]

EXAMPLE An example in which the structure of the soil heat storage section of the present invention is applied to a heat storage section of a snow melting facility using a bank portion such as an expressway will be described with reference to FIGS. 1 and 2.

The soil heat storage section 11 is installed in the ground on the roadside 12a of the highway 12 constructed by embankment. The soil heat storage unit 11 is isolated from the surrounding soil by a water-blocking and heat-insulating layer, and the water content of the soil in this portion is maintained at about 20%.

On the south-facing slope 13 of the highway 12 constructed by embankment, the evaporation portions 14a of the heat collecting heat pipes 14 are buried along the surface of the slope 13 and the solar heat is applied. It is a heat collecting part. The condenser sections 14b of the heat collecting heat pipes 14 are arranged at predetermined inclination angles in the soil of the soil heat storage section 11 so that the ends on the condenser section 14b side are the highest. It is provided and carries the heat absorbed by the evaporation section 14a arranged on the slope 13 which is the solar heat collecting section and accumulates it in the soil heat storage section 11.

Further, in the soil heat storage section 11, the heat collection section 15a of the hot water circulation pipe 15 is brought close to the condensation section 14b of the heat collection heat pipe 14 which is arranged to be inclined, and the soil heat storage section 11 is also provided. They are arranged in a zigzag shape so that heat can be collected from a wide range. The downstream side of the heat collecting section 15a (the lower side at the right end in FIG. 1) is pipe-connected to one end of a U-shaped header pipe section 16 installed below the road surface of the upper expressway 12. Pipe section 16
The other end is connected to the upstream side of the hot water circulation pipe 15 in the soil heat storage section 11 to form a hot water circulation pipe line equipped with a circulation pump (not shown). Further, the evaporation portions of the snow melting heat pipes 17 are respectively inserted in the U-shaped header pipe portions 16, and the snow melting heat pipes 17 are
The condensing section side of each is disposed directly below the road surface of the highway 12.

The condenser section 14b provided in the soil heat storage section 11 of the heat collecting heat pipe 14 is provided with a solenoid valve 18 near the lower end of the slanted section. Reservoir tanks 19 for accumulating the working fluid F are provided on the lower surfaces on the side higher than the valve 18 (see FIG. 2).

Next, the operation of this embodiment configured as described above will be explained. When the snow is not melted, the soil heat storage section 11 of the snow melting apparatus has a slope 13 which is a solar heat collecting section. The radiated solar heat heats the evaporation section 14a of the heat collecting heat pipe 14, and the enclosed working fluid F becomes vapor and moves to the condensation section 14b arranged in the soil heat storage section 11, The condenser section 14b radiates heat to be condensed, returns to the working fluid F in the liquid phase, flows downward due to gravity, and flows into the reservoir tank 19 provided near the lower end of the condenser section 14b.
Overflows from the tank and flows back to the lower evaporation section 14a.

In this way, the solar heat collected on the slope 13 is carried to the soil heat storage section 11 by the heat collecting heat pipe 14 and accumulated therein. In addition, during the winter season when the amount of collected solar heat decreases, the solenoid valve 18 of the heat collecting heat pipe 14 is used.
Is closed by a signal operation from the ground to stop the heat collection operation.

When snow is melted in the winter season or the like, the circulation pump is driven to circulate the hot water in the hot water circulation pipe 15, and when passing through the heat collecting section 15a arranged in the soil heat storage section 11. After flowing down while absorbing the heat of the surrounding soil and raising the temperature, it is sent to the U-shaped header pipe portion 16 arranged below the road surface. While hot water is flowing through the U-shaped header pipe portion 16, the evaporation portion of the snow melting heat pipe 17 inserted into each U-shaped header pipe portion 16 is heated, and the working fluid sealed inside is vaporized. Then, it moves to the condensation section arranged directly below the road surface, and radiates heat there to perform snow melting on the road surface.

As a result, the hot water gradually loses heat while flowing through the U-shaped header pipe portion 16 and its temperature drops, and becomes low-temperature hot water, and the hot water flows from the U-shaped header pipe portion 16 into the soil heat storage unit 1.
1 flows into the heat collecting portion 15a disposed inside the heat collecting portion 1
While flowing through the inside of 5a, heat is absorbed from the surrounding soil and the temperature is raised again to the temperature required for snow melting.

In this way, the heat collecting heat pipe 14 is used.
The heat accumulated in the soil heat storage section 11 by
By gradually consuming it, snow melting on the road etc. is performed,
Then, heat is collected, and the temperature of the soil around the heat collecting unit 15a decreases.

As a result, the temperature of the hot water flowing through the hot water circulation pipe 5 arranged in the soil heat storage unit 11 is determined by the heat collection unit 15
Since the temperature is low on the upstream side of a and increases as it goes on the downstream side, the temperature of the soil around the heat collecting section 15a is also 1
5a is low on the upstream side and high on the downstream side.

However, the condenser part 14b side of the heat collecting heat pipe 14 arranged in the soil heat storage part 11 is blocked by the solenoid valve 18 from communicating with the evaporation part 14a side, and at the same time, in the reservoir tank 19. Since the working fluid is retained, only the portion arranged in the soil heat storage section 11 acts as a heat pipe. Therefore, the heat collecting unit 15 of the condensing unit 14b, which has a high temperature of the soil heat storage unit 11, is used.
The portion disposed on the downstream side of a, that is, the lower side (the right side in FIG. 2) of the slanted section newly becomes the evaporation section, absorbs heat from the surrounding soil, and cools at a low temperature. The heat is transported to the upstream side of a certain heat collecting part 15a, that is, the condensing part on the higher side (left side in FIG. 2) of the section that is arranged to be inclined, so that the soil heat storage part 11 is made uniform in temperature.

Therefore, due to the heat pipe action of the condenser portion 14b, a large amount of heat is collected and the temperature tends to decrease.
In the soil heat storage section 11, heat is transported from the soil around the downstream side having a high temperature to the soil around the upstream side of the heat collection section 15a so as to equalize the temperature, so that hot water caused by uneven temperature in the soil heat storage section 11 is generated. A decrease in heat collection efficiency due to the circulation pipe 15 is prevented, and a stable snow melting capacity is maintained.

Further, as described above, in this embodiment, since the heat collecting portion 15a of the hot water circulation pipe 15 is provided close to the condenser portion 14b of the heat collecting heat pipe 14,
The temperature unevenness in the soil heat storage unit 11 can be quickly dealt with to make the temperature uniform.

In the above embodiment, the case where the condenser part 14b side is also used as a soaking heat pipe by closing the middle of the heat collecting heat pipe 14 with the solenoid valve 18 has been described. Even if the heat pipe and the soaking heat pipe are separately provided, the same effect can be obtained. In this case, the heat equalizing heat pipe does not require a reservoir tank, and if a heat pipe equipped with a wick is used, it is not necessary to incline it.

[0031]

As described above, according to the present invention, the hot water circulation pipe is circulated between the soil part for storing heat and the heat radiating part for consuming heat, and water is circulated through the hot water circulation pipe so that In the structure of the soil heat storage unit for collecting heat, a heat pipe is provided in the soil, one end side of which is arranged downstream of the hot water circulation pipe, and the other end side of which is arranged upstream, so that the action of this heat pipe By this, the inside of the soil heat storage section is maintained in a uniform temperature state, and the heat collection efficiency of the hot water circulation pipe is improved.

If the heat pipe arranged in the soil of the soil heat storage unit is provided so that the downstream side of the hot water circulation pipe is low and the upstream side thereof is high, it operates in a so-called bottom heat state in which the evaporation unit side is low. As a result, heat transfer efficiency is improved, and since a heat pipe having a simple structure without a wick can be used, cost reduction and durability can be improved.

If an on-off valve is provided at a lower position of the condensing part of the inclined heat pipe, and a reservoir tank in which a part of the working fluid flowing down inside the condensing part is accumulated at a position higher than this on-off valve, By closing the on-off valve, only the section above the on-off valve can operate the heat pipe.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of a soil heat storage unit of the present invention.

FIG. 2 is an enlarged cross-sectional view showing the structure of a heat collecting heat pipe.

FIG. 3 is a sectional view showing a structure of a conventional soil heat storage section.

[Explanation of symbols]

 11 Soil Heat Storage Section 12 Expressway 13 Slope 14 Heat Collection Heat Pipe 14a Evaporation Section 14b Condensing Section 15 Hot Water Circulation Pipe 16 U-shaped Header Pipe Section 17 Snow Melting Heat Pipe 18 Solenoid Valve 19 Reservoir Tank F Working Fluid

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Yuuji Saito 1-5-1 Kiba, Koto-ku, Tokyo Fujikura Electric Cable Co., Ltd. (56) Reference JP-A-4-189906 (JP, A)

Claims (3)

(57) [Scope of utility model registration request] 1. A structure of a soil heat storage part in which a hot water circulation pipe is circulated between a soil part for storing heat and a heat radiating part for consuming heat, and water is circulated through the hot water circulation pipe to collect heat from the soil part. A structure of a soil heat storage section, characterized in that a heat pipe is provided in the soil, one end side of which is arranged on the downstream side of the hot water circulation pipe and the other end side thereof is arranged on the upstream side. 2. The structure of the soil heat storage section according to claim 1, wherein the heat pipe is inclined so that the downstream side of the hot water circulation pipe is low and the upstream side thereof is high. 3. The heat pipe is provided with an opening / closing valve at a lower position of the condensing part, and a reservoir tank at a position higher than the opening / closing valve, in which a part of the working fluid flowing down in the condensing part is accumulated. The structure of the soil heat storage part according to claim 2.