JP2003227104A - Geothermal heat using system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a geothermal heat using system capable of preventing snow from accumulating on a road/an expressway/a bridge/a house in winter. <P>SOLUTION: The geothermal heat using system is so constituted that a plurality of heat pumps 1 circulating in the ground 4 having at least a depth of 1.5 m and around the ground surface 2 and circulating heat in the ground 4 and around the ground surface 2 are embedded in the direction at approximately right angles to the driving forward direction of the road 3 to prevent the accumulation of snow on the road 3 by making use of the geothermal heat. The system can be applied to the expressway, the bridge spanning across a river, the house or the like. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a geothermal heat utilization system capable of melting snow accumulated by utilizing geothermal heat, for example, easily melting snow accumulated on general roads / highways / bridges / houses / tracks. Geothermal utilization system that can be.

[0002]

2. Description of the Related Art Generally, when heavy snowfall occurs in winter,
Snow accumulates on general motorways, obstructs the passage of cars, and the snow freezes after snowfall, causing slip accidents. In particular, on the bridge that crosses the river, the space under the bridge also cools the bridge itself, and the amount of deposition increases, which often causes the obstruction of the passage and slip accidents.
As a conventional technique for melting the snow accumulated on the road or bridge, a melting agent is sprinkled on the snow or the snow is moved to the side of the road or the like by hand or a snowplow.

[0003] In the expressway of a viaduct, since the bottom of the road surface is exposed to the outside air, the road surface itself of the expressway is cooled from the up and down direction, and the temperature drop of the road surface is larger than that of the general road. There was a great tendency to freeze and snow.

Further, even in a general house, when a large amount of snow is accumulated, the house may be collapsed, and the snow is manually removed.

Further, even in railways, the point switching unit for switching rails may freeze, and switching may not be possible, and railway operation may stop. For this reason, conventionally, a large number of heaters such as heaters are arranged in the point switching unit. However, the heating tool is used to prevent freezing.

[0006]

The conventional technique for removing snowfall on the roads / highways is difficult to remove the snow sufficiently even if a dissolving agent is used, and it is costly when using a human or a snowplow. In addition, there was a problem that it took time and that the snow that moved to the side of the road hindered traffic. On the other hand, when the road is asphalt, there is a possibility that the road surface becomes hot in midsummer and the vehicle tires melt. Furthermore, there is a problem that the temperature rise of the road contributes to the heat island phenomenon in which the center of the city becomes hotter than the surrounding area.

The work of manually removing the snow accumulated in the house has a problem that the work is complicated and is dangerous because of the work at a high place. Furthermore, the technique of using a heating tool for preventing the point switching section from being frozen on the railway has a problem that the heating tool needs to be manually arranged at each of a large number of points each time and further maintenance is required. .

The present invention provides a geothermal utilization system capable of eliminating the above-mentioned problems of the prior art, easily melting snow on roads, bridges, houses, railways, highways, etc., and preventing snow accumulation. It is to be. Specifically,
It is an object of the present invention to easily melt snow falling on roads (including highways) and bridges, obstructing the passage of automobiles due to snow accumulation and preventing freezing, and further reducing the heat island phenomenon. Providing a geothermal utilization system, providing a geothermal utilization system that can easily melt snow falling on a house and eliminate the time and effort of snow removal, and can easily prevent freezing of railway point changers It is to provide a geothermal utilization system.

[0009]

In order to achieve the above object, the geothermal utilization system according to the present invention has at least 1.5.
The first feature is to include a heat pump that circulates in the ground at a depth of m and near the ground surface and circulates heat in the ground and near the ground surface.

Further, the present invention is, in the first feature,
The second feature is that a plurality of the heat pumps are buried substantially at right angles to the traveling direction of the road, and the heat pump is buried along the bridge over the river in the surface layer and the ground on both sides of the bridge. The third feature is that the surface layer part is arranged on the bridge, and the deep layer part is buried in the ground on both sides of the bridge, and the heat pump is supported by a viaduct. The fourth step is to divide the surface layer portion extending along the vehicle traveling direction of the highway road surface and the deep layer portion buried in the ground supporting the viaduct to pneumatically connect the surface layer portion and the deep layer portion. Characteristically, the heat pump is divided into a surface layer portion extending along a direction substantially vertical to the rail of the railway and a deep layer portion buried in the ground supporting the rail, and the heat pump is placed at a location where heat conduction can be performed with the rail. Place the surface layer, and That buried deep portion in the ground for supporting the rail a fifth feature.

Further, in the geothermal heat utilization system according to the present invention, in the second to fifth characteristics, the heat pump is
A sixth feature is that a fan that circulates heat inside is provided.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a geothermal utilization system according to the present invention will be described in detail below with reference to the drawings. Figure 1
Is a diagram for explaining an embodiment in which the geothermal heat utilization system according to the present invention is applied to a road, FIG. 2 is a diagram for explaining the heat pump in FIG. 1, and FIG. 3 is a diagram for explaining another embodiment of the heat pump. FIG. 4 is a diagram for explaining an embodiment in which the geothermal utilization system according to the present invention is applied to a bridge, FIG. 5 is a diagram for explaining an embodiment in which the geothermal utilization system according to the present invention is applied to a house, and FIG. 6 is FIG. 7 is a diagram for explaining an embodiment in which the geothermal utilization system according to the present invention is applied to a railway, FIG. 7 is a diagram for explaining an embodiment in which the geothermal utilization system according to the present invention is applied to a highway, and FIG. 8 is a principle diagram thereof. Is. <First Embodiment Applied to Road> First, an embodiment in which a geothermal utilization system is applied to a road will be described with reference to FIGS. 1 and 2. The geothermal heat utilization system shown in FIG. 1 includes a large number of annular heat pumps 1 that circulate between a ground surface 2 and an underground 4 of a road 3 extending in a traveling direction of a vehicle along a direction perpendicular to the vehicle traveling direction of the road 3. It is constructed by being buried.

The heat pump 1, as shown in FIG.
The height H is about 150 cm, the width W is equal to the road width, the pipe diameter is about 10 cm, and a flow passage through which air can circulate is formed inside. The temperature of the portion 1a near the surface of the heat pump 1 is the outside air. Due to the temperature and radiant heat from the sun, the temperature becomes relatively high in the summer and relatively low in the winter, and the temperature of the deep portion 1b of the heat pump 1 becomes substantially constant regardless of the season, for example, about 18 degrees. . Further, as shown in FIG. 3B, a fan motor 33 and a fan 32, which is a blade that is rotationally driven by the fan motor 33, are built in a part of the heat pump 1, for example, a part of a vertical part.
As a drive source of the motor 33, a solar cell arranged on the side of the road surface or the like can be considered.

For this reason, the buried heat pump 1 is composed of a temperature changing region 20 where the temperature changes depending on the season near the surface of the earth and a room temperature region 21 where the temperature is substantially constant regardless of the season deep in the ground, and in the summer, The temperature change area 20 is relatively high, for example, 40 degrees or more in the case of an asphalt road, and the room temperature area 21 is relatively low at about 18 degrees, and the temperature change area 20 is relatively low in winter, for example, an asphalt road during snowfall. In this case, the temperature is 0 degrees or less, and the room temperature region 21 is about 18 degrees, which is a relatively high temperature.

In the geothermal heat utilization system configured as described above, the temperature changing region 2 of the heat pump 1 near the surface 2 of the earth is used in winter.
Since 0 becomes a relatively low temperature and the room temperature region 21 of the underground heat pump 1 becomes a relatively high temperature, an ascending air current is generated from the room temperature region 21 to the temperature changing region 20 toward the heat pump 1
The convection 22 of air occurs in the inside of the chamber, thereby warming the temperature changing region 20. Therefore, the surface portion of the road 3 is also warmed, the snow falling on the surface can be melted, and the accumulation of snow on the road can be prevented. In addition, in order to promote the generation of the convection 22, the fan 3 is driven by the motor 33.
2 may generate an air flow from below (underground) to above (ground).

Further, in the geothermal heat utilization system, in the summer, the temperature change region 20 of the heat pump 1 near the surface 2 becomes a relatively high temperature, for example, 40 ° C. or higher, and the heat pump 1 in the ground is heated.
The room temperature region 21 is at a relatively low temperature of about 18 degrees. In this state, the motor 32 causes the fan 32 to generate an airflow from the upper side (surface) to the lower side (underground), thereby generating the convection 22. As a result, in the heat pump 1, an air flow from the temperature changing region 20 to the normal temperature region 21 is generated, and the temperature changing region 20 is cooled. Therefore, the surface portion of the road 3 is also cooled, and the surface of the road 3 can be prevented from becoming abnormally hot.

Therefore, the geothermal utilization system according to the present embodiment can prevent the road surface from being warmed to accumulate snow in winter and prevent the road surface from becoming hot in summer. Therefore, it is possible to prevent the passage of automobiles and freezing due to the accumulation of snow, and further reduce the heat island phenomenon.

In the above embodiment, an example in which the heat pump 1 having a horizontal portion buried in the ground shown in FIG. 2 is used has been described, but the present invention is not limited to this, and for example, FIG. As shown in a), the heat pump 30 in which the portion to be buried in the ground is deepened stepwise may be used.
The heat pump 30 has a portion 1c deeper than the height H of about 150 cm, has a tube diameter of about 10 cm, and forms a flow passage in which air can circulate. This heat pump 30 forms a room temperature region 21 portion in the ground in a step shape,
As shown in FIG. 3, because of left-right asymmetry, a differential pressure of the ascending airflow is generated in the left and right heat pumps, and convection can be more easily generated.

In the above embodiment, an example in which a fan and a fan motor are provided in a part of the heat pump has been described. However, when only the purpose of melting snow in winter is, convection occurs due to rising air current. The fan and fan motor can be omitted. Further, according to the above-described embodiment, an example in which the shape of the heat pump is stepwise has been described, but it may be triangular. Further, the depth of the heat pump may be 180 cm or less. Further, the geothermal heat utilization system may be arranged, for example, on an inclined surface of a road, and may be embedded especially in a place where slippage of a vehicle is a problem.
Further, although the example in which the heat pump 1 is filled with air has been described, a gas with good heat circulation may be filled, and fins (radiating plates) for increasing heat exchange efficiency may be provided in the deep layer portion. These modifications are the same in the embodiments described later. <Second Embodiment Applied to Bridge> Next, an embodiment in which a geothermal utilization system is applied to a bridge will be described with reference to FIG. FIG. 4 shows an example in which a heat pump 40 including two pipes that circulate by connecting both sides of the bridge 43 is used for a bridge 43 having a balustrade 42 over a river. The geothermal heat utilization system according to the present embodiment includes a heat pump 40.
Is divided into a surface layer portion embedded in a bridge 43 extending in the direction of crossing the river and a deep layer portion embedded in the ground on both banks of the bridge 43. Is buried underground on both sides of the bridge 43.

In the geothermal heat utilization system according to the present embodiment, both ends of the circulating heat pump 40 are about 150 on both banks.
It is buried in a deep layer of cm or less, and due to the temperature difference between the room temperature region of this deep portion and the temperature change portion arranged on the surface of the bridge, the relatively high temperature portion of the deep portion and the bridge surface are It is possible to prevent snow from accumulating on the bridge due to convection in the room temperature. Further, the present embodiment can be applied to a road supported by a pillar such as a highway,
In this case, it is conceivable to arrange the heat pops in a direction substantially vertical to the road and bury the deep layer in the ground. In addition, in order to promote the generation of the convection in the present embodiment as well, FIG.
The fan and motor shown in (b) may be provided. <Third Embodiment Applied to House> FIG. 5 is a diagram for explaining an embodiment in which the geothermal utilization system according to the present invention is applied to a house. In the geothermal utilization system according to the present embodiment, for a house 52 having a roof 51, two series of circulating heat pumps 50 are arranged so as to have a deep layer portion that straddles the roof 51 and is buried in the ground surface 53 on both sides of the house 52. Here is an example.

In the geothermal heat utilization system according to this embodiment, a house 52 is provided at both ends of a heat pump 50 in which air circulates.
It is buried in a deep layer of about 150 cm or less on both sides of the ground, and due to the temperature difference between the normal temperature region of this deep layer and the temperature changing portion arranged on the surface of the roof 51, the deep layer comparison in the same manner as in the above example in winter. It is possible to prevent snow from accumulating on the roof due to convection between the high temperature part and the room temperature part of the bridge surface.

Further, in the summer, the motor 33 and the fan 32 shown in FIG. 3 are provided inside, and the air flow is generated from the upper side (roof 51) to the lower side (underground), whereby the roof 51
The heat of can be released to the ground, and the cooling cost can be reduced. <Fourth Embodiment Applied to Railway> FIG. 6 is a view for explaining an embodiment in which the geothermal utilization system according to the present invention is applied to rails of a railway. The geothermal heat utilization system according to the present embodiment is configured by arranging a sleeper 62 having high thermal conductivity under a rail 61 of a railway and burying a number of heat pumps 60 in contact with the sleeper 62.

In the geothermal heat utilization system according to the present embodiment, the heat pump 60 in which air circulates is buried so that the upper part is in contact with the sleeper 62 and the lower part is on the ground to a depth of about 150 cm or less, and the room temperature of the deep part is Due to the temperature difference between the region and the temperature changing part (sleepers in contact with the rail), convection occurs between the relatively high temperature part of the deep part and the room temperature part of the ground in winter, and snow is accumulated on the rail, as in the above embodiment. Can be prevented, and freezing of the point switching unit and the like can be prevented. Further, the heat pump 60 may be embedded only in the vicinity of the point switching section, or may be installed together with a conventional heater.

Further, in the summer, the motor 33 and the fan 32 shown in FIG. 3 are provided inside, and the heat of the rail 61 is transferred to the ground by generating an air flow from the upper side (rail 61) to the lower side (ground). The rail 61 can be released and the expansion of the rail 61 can be reduced. The sleeper 62 is preferably made of a material having good thermal conductivity, and may be concrete. Further, in the above embodiment, an example of performing heat exchange with the heat pump through the sleeper has been described, but the present invention is not limited to this, and the heat pump can be directly connected to the rail or via a cushioning material having good thermal conductivity. It may be configured to connect,

<Fifth Embodiment Applied to Expressway> FIG. 7 is a diagram for explaining an embodiment in which the geothermal utilization system according to the present invention is applied to a highway, and FIG. 8 is a principle diagram thereof. The geothermal utilization system according to the present embodiment is shown in FIG.
As shown in FIG.
A large number of heat pumps 70b are embedded in the road of a highway bridge 71 of a viaduct on which vehicles run, and air pipes are connected to the ends of the plurality of heat pumps 70b to connect air pipes at the ends. Connection part 7 to be integrated into one tube
0a and the underground heat pump unit 70c buried in the ground
And a connecting portion 70 that connects the connecting portion 70a and the underground heat pump portion 70c while supporting them. As shown in FIG. 7 (b), the underground heat pump unit 70c guides the air flow collected by the continuous row unit 70a to the inner peripheral portion of the pipe outer shape, and has an open end portion, from which the end portion flows out. An inner tube 70 including a fan 32 for admitting a restricted air flow
and d. As shown in FIG. 8, the geothermal heat utilization system configured in this manner allows the air flow (indicated by the arrow) flowing through the heat pump portion 70b buried in the expressway surface to be arranged in a row 70a / support portion 70 / underground. It is configured to circulate through the heat pump unit 70c.

In the geothermal heat utilization system thus constructed, the heat pump section 7 buried in the road surface of the highway is used in winter.
0b becomes a relatively low temperature, and the heat pump part 70c in the ground
Becomes relatively hot, so the underground heat pump unit 70c
As a result of the ascending airflow from the road surface to the heat pump unit 70b on the road surface and the above-described air flow, the temperature decrease on the road surface of the highway can be prevented, the snow falling on the surface can be melted, and the snow accumulates on the road surface. Can be prevented. In order to promote the generation of the convection, the motor 32 may cause the fan 32 to generate an air flow from below (underground) to above (ground).

Further, the geothermal heat utilization system is such that the heat pump section 7 buried in the road surface of the highway bridge 71 in summer.
0b becomes a relatively high temperature, for example, 40 degrees or more, and the heat pump section 70c in the ground becomes a relatively low temperature, about 18 degrees. In this state, the fan 32 generates an air flow, so that the heat pump section 70b on the road surface By circulating the air in the heat pump unit 70c buried in the ground, the heat of the road surface can be released into the ground, and thus the road surface can be prevented from becoming abnormally hot.

Therefore, the geothermal heat utilization system according to the present embodiment can prevent the highway surface from warming up in the winter to prevent snow accumulation, and prevent the road surface from becoming hot in the summer. Therefore, it is possible to prevent the passage of automobiles and freezing due to the accumulation of snow, and further reduce the heat island phenomenon. In the above embodiment, as shown in FIG. 8, an example in which two underground heat pump parts 70c are provided at both ends in the vehicle traveling direction of the highway has been described, but the present invention is not limited to this, and for example, A U-shaped heat pump portion 70b having a U-shaped road surface that extends from the forward path of the expressway road surface and returns after reaching a predetermined distance is formed, and the heat pump portion 70c of the forward path and the return path is
One heat pump unit 70 is integrated by one connecting unit 70a.
You may comprise so that the above-mentioned heat exchange may be performed by c.

As described above, the geothermal heat utilization system according to the present invention uses the heat pump for circulating the heat of the earth to utilize the heat of the earth for the general road / light flux road / bridge / house / railroad in winter. As a result, the accumulation of snow can be prevented, and the heating of roads and the like can be reduced even in summer.

In the above embodiment, an example in which the present invention is applied to roads / bridges / houses / railroads / highways has been described, but the present invention is not limited to these, and uses underground geothermal heat. It can be applied to everything that reduces the temperature in summer of structures on the ground, such as airport runways, buildings, and anything else that can be damaged by snow. Further, the present invention divides the heat pump into a surface layer portion extending along the roof of the house and a deep layer portion buried in the ground where the house is built, and disposing the surface layer portion on the roof of the house. Also, it can be represented as a geothermal utilization system characterized in that the deep portion is buried in the ground where a house is built.

[0031]

As described above, the geothermal heat utilization system according to the present invention uses a heat pump that circulates the heat of the earth to the surface of the earth, so that roads / bridges / houses / railroads /
It is possible to prevent snow from accumulating on the expressway and the like by utilizing the heat in the ground, and further reduce the heating of the road and the like even in the summer.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an embodiment in which a geothermal utilization system according to the present invention is applied to a road.

FIG. 2 is a diagram for explaining the heat pump in FIG.

FIG. 3 is a view for explaining a heat pump according to another embodiment of the present invention.

FIG. 4 is a view for explaining an embodiment in which the geothermal utilization system according to the present invention is applied to a bridge.

FIG. 5 is a diagram for explaining an embodiment in which the geothermal heat utilization system according to the present invention is applied to a house.

FIG. 6 is a diagram for explaining an embodiment in which the geothermal utilization system according to the present invention is applied to a railway.

FIG. 7 is a diagram for explaining an embodiment in which the geothermal utilization system according to the present invention is applied to a highway.

FIG. 8 is a diagram for explaining the principle of an embodiment in which the geothermal utilization system according to the present invention is applied to a railway.

[Explanation of symbols]

1: heat pump, 2: ground surface, 3: road, 4: underground, 2
0: Variable temperature region, 21: Normal temperature region, 22: Convection, 30: Heat pump, 31: Convection, 30a: Part of heat pump, 32: Fan, 33: Fan motor, 40: Heat pump, 41: Bridge, 42 and 43 : Bridge girder, 50: Heat pump, 51: Roof, 52: House, 53: Ground surface, 60:
Heat pump, 61: Rail, 62: Sleepers, 63: Ground surface, 71: Expressway, 70b: Heat pump section, 72:
Prop, 73: ground surface, 70a: connection part, 70b: support part,
70c: Heat pump part.

Claims (6)

[Claims] 1. A geothermal heat utilization system comprising a heat pump which circulates at least 1.5 m deep into the ground and near the ground surface and circulates heat in the ground and near the ground surface. 2. The geothermal heat utilization system according to claim 1, wherein a plurality of the heat pumps are buried substantially at right angles to the traveling direction of the road. 3. The heat pump is divided into a surface layer portion buried along a bridge spanning a river and a deep layer portion buried in the ground on both sides of the bridge, and the surface layer portion is arranged on the bridge. 2. The geothermal utilization system according to claim 1, wherein the deep portion is buried in the ground on both sides of the bridge. 4. The heat pump is divided into a surface layer portion extending along a vehicle traveling direction of a road surface of an expressway supported by a viaduct and a deep layer portion buried in the ground supporting the viaduct, and the surface layer portion is provided. The geothermal utilization system according to claim 1, wherein the deep portion is pneumatically connected. 5. A place where heat can be conducted to the rail by dividing the heat pump into a surface layer portion extending along a direction substantially perpendicular to a rail of a railway and a deep layer portion buried in the ground that supports the rail. 2. The geothermal heat utilization system according to claim 1, wherein the surface layer portion is arranged in the ground and the deep layer portion is buried in the ground that supports the rail. 6. The geothermal utilization system according to claim 2, 3 or 4 or 5, wherein the heat pump is provided with a fan for circulating heat inside.