JP2018003542A - Geothermal snow-melting facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a geothermal snow-melting facility requiring no electricity or water, which can be easily installed.SOLUTION: A geothermal snow-melting facility includes a plurality of thermally conductive rods 2 in a rod shape having a high thermal conductivity, which extend in the vertical direction to be installed in a ground G for conducting the geothermal heat collected at the lower end side 21 to the upper end side 22, and a radiator 3 having a high thermal conductivity, which is connected to the upper end side 22 of the thermally conductive rods 2 and disposed along the ground surface G1 so as to radiate the geothermal heat conducted from the thermally conductive rods 2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a snow melting facility for melting snow, and more particularly to a geothermal snow melting facility for melting snow by geothermal heat.

  For example, when there is snow in an electric power facility, it has been necessary to remove snow around a passageway and fence doors with a snow remover and human power, which requires a lot of time and labor. Therefore, in order to eliminate the need for snow removal, a snow melting device that melts snow with heat generated by electricity (see, for example, Patent Document 1) and a snow melting device that melts snow using running water pumped by a pump (for example, patents). Reference 2) is known.

  In addition, a snow melting system using geothermal heat is known (see, for example, Patent Document 3). In other words, an artificial heat source is buried in the ground, and from immediately below this artificial heat source to the ground, it absorbs geothermal heat when the artificial heat source is inactive and stores heat, and when the artificial heat source is activated, the heat energy released from it is stored. A heat storage layer that absorbs part of the heat and stores it is stacked. In addition, a high heat conductive material is mixed from the heat storage layer to the ground, and a heat dissipation layer having better heat conduction characteristics and heat radiation characteristics than the heat storage layer is laminated.

JP 56-999991 A JP 57-1230612 A JP-A-11-222803

  By the way, in the snow melting apparatus of patent document 1, since electricity is required, it cannot apply in the mountain part etc. to which electricity is not supplied. Similarly, in the snow melting apparatus described in Patent Document 2, since running water is required, it cannot be applied in a place where there is no water source such as tap water, valley water, or groundwater, and the application place is limited. In addition, the water distribution pipe of the snow melting device may freeze and cannot be used. Furthermore, in the snow melting apparatus described in Patent Documents 1 and 2, running costs such as electricity bills and water bills are required.

  Further, in the snow melting system described in Patent Document 3, an artificial heat source (such as an electric heater) is embedded in the ground, and a heat storage layer is stacked between the area immediately below the artificial heat source and the ground, and further, from the heat storage layer to the ground. A heat dissipation layer must be laminated on the surface. For this reason, not only a large construction is required for installation, but also a great expense is required, and it may not be applicable depending on the surrounding environment.

  Therefore, an object of the present invention is to provide a geothermal snow melting facility that does not require electricity or water and is easy to install.

  In order to solve the above-mentioned problems, the invention of claim 1 is a rod-like and has high thermal conductivity, extends in the vertical direction, is buried in the ground, and conducts geothermal heat collected at the lower end side to conduct to the upper end side. A heat conduction rod, and a heat radiator that has high thermal conductivity, is connected to the upper end side of the heat conduction rod, is disposed along the ground surface, and dissipates the geothermal heat conducted from the heat conduction rod. This is a geothermal snow melting facility characterized by

  According to this invention, the geothermal heat collected by the plurality of heat conducting rods is conducted to the heat radiating body and radiated from the heat radiating body, and the ground snow melts by this geothermal heat.

  According to a second aspect of the present invention, in the geothermal snow melting facility according to the first aspect, the outer peripheral surface of the heat conducting rod is covered with a heat insulating material except for the lower end side.

  According to a third aspect of the present invention, in the geothermal snow melting facility according to the first or second aspect, the heat radiator is configured by arranging a plurality of rod-shaped heat radiation rods that dissipate geothermal heat in a grid pattern. It is characterized by.

  According to the invention of claim 1, since snow on the surface is melted by geothermal heat, electricity and water are unnecessary, and it can be applied to various places and the running cost can be reduced. In addition, since it is only necessary to embed a plurality of heat conduction rods in the ground and dispose a radiator along the surface of the earth, it is easy to install and can reduce installation costs. It becomes possible to apply to.

  According to the invention of claim 2, since the outer peripheral surface of the heat conducting rod is covered with the heat insulating material except for the lower end side, the geothermal heat collected on the lower end side of the heat conducting rod is efficiently and effectively upper end. Conducted by the side and the radiator, it can effectively melt snow.

  According to the third aspect of the present invention, since the heat radiating body is configured by arranging the plurality of heat radiating rods in a lattice shape, it is possible to effectively radiate geothermal heat with a small amount of material. In addition, by making it possible to connect multiple heatsinks, it is possible to easily configure a heatsink suitable for the installation location and the surrounding environment simply by changing the location (layout) of the heatsink. High degree of freedom. Further, when some of the heat radiating rods are damaged, only the heat radiating rods need to be repaired or replaced, so that it is possible to respond quickly and appropriately at low cost.

1 is a plan view showing a geothermal snow melting facility according to Embodiment 1 of the present invention. It is sectional drawing (side view) which shows the geothermal snow-melting equipment of FIG. It is a schematic plan view which shows the 1st example (a) and the 2nd example (b) which connect a radiation stick in the geothermal snow melting equipment of FIG. It is a schematic side view which shows the 1st example (a) and 2nd example (b) which connect a heat radiator and a heat-conducting rod in the geothermal snow melting equipment of FIG. It is the top view (a) which shows the geothermal-type snow melting facility which concerns on Embodiment 2 of this invention, and its AA sectional drawing (b).

  The present invention will be described below based on the illustrated embodiments.

(Embodiment 1)
FIG. 1 and FIG. 2 are a plan view and a cross-sectional view showing a geothermal snow melting facility 1 according to this embodiment. The geothermal snow melting facility 1 is a facility that melts snow S by geothermal heat, and mainly includes a plurality of heat conducting rods 2 and a radiator 3.

  The heat conduction rod 2 has a rod shape and high thermal conductivity, extends in the vertical direction, is buried in the underground G, and conducts the geothermal heat collected at the lower end side 21 to the upper end side 22. That is, in this embodiment, it is a round bar made of copper or carbon nanotubes having high thermal conductivity, extends vertically and is buried in the underground G, and the end face of the upper end side 22 is located near the ground surface G1. ing. The length of the heat conduction rod 2, that is, the depth of the lower end side 21 is set so that the snow S on the ground surface G1 is melted by the surrounding geothermal heat. For example, the end surface of the lower end side 21 is 5 m from the ground surface G1. Set to a depth of.

  Moreover, in this embodiment, the cross section (outer diameter) of the lower end side 21 is larger than that of the conductive portion which is another portion, and the cross section and length (heat collection area) of the lower end side 21 are the heat collection portion. It is set so that the snow S on the ground surface G1 is melted by the geothermal heat collected at a certain lower end side 21, for example, the outer diameter of the lower end side 21 is set to 10 cm and the length is set to 1 m. Then, the geothermal heat collected at the lower end side 21 is conducted to the upper end side 22 through the central portion.

  The outer peripheral surface of the heat conducting rod 2 is covered with the heat insulating material 4 except for the lower end side 21. That is, the outer peripheral surface of the central portion and the upper end side 22 of the conductive portion of the heat conducting rod 2 so that the geothermal heat collected at the lower end side 21 is efficiently transmitted to the radiator 3 without escaping to the outside. It is covered with a heat insulating material 4 such as polystyrene foam or glass wool. Furthermore, the heat insulating material 4 is covered with a hard cover (not shown), and the heat conducting rod 2 and the heat insulating material 4 are integrally formed so that handling such as embedding and transportation is easy.

  The radiator 3 has high thermal conductivity and high thermal radiation, is connected to the upper end side 22 of the thermal conduction rod 2, is disposed along the ground surface G1, and radiates the geothermal heat conducted from the thermal conduction rod 2. A plurality of rod-shaped heat radiation rods 31 that radiate geothermal heat are arranged in a grid pattern. That is, in this embodiment, a plurality of rectangular bar-shaped heat dissipation rods 31 made of copper or carbon nanotubes having high thermal conductivity, that is, heat dissipation, are arranged vertically and horizontally to form a square lattice grid, A radiator rod 31 is disposed along the diagonal line to constitute a lattice plate-like radiator 3.

  Here, the heat radiating body 3 may be configured by combining (connecting) the heat radiating bars 31 as separate bodies, or the heat radiating body 3 including the plurality of heat radiating bars 31 may be integrally configured. In this embodiment, the radiator 3 is configured by connecting a separate radiator rod 31. That is, the heat radiator 3 is configured by cutting each long body of copper or carbon nanotube into a desired length to produce each heat dissipating rod 31 and connecting and joining the heat dissipating rods 31 to each other.

  Here, the connecting and joining of the heat radiating bars 31 may be of any type. For example, as shown in FIG. 3A, the side surfaces of the heat radiating bars 31 are bolted via a connector 51. (Fastening member) may be detachably connected. Further, as shown in FIG. 3B, the flat surfaces (the upper surface or the lower surface, and the lower surface is shown in the drawing) of the heat dissipating rods 31 may be detachably connected with a bolt via a connector 52. Alternatively, the heat radiating bars 31 may be joined together with a joining agent.

  Such a radiator 3 is connected to the end face of the upper end side 22 of each heat conducting rod 2, and the upper surface of the radiator 3 is disposed along the ground surface G1. Here, the connection between the heat radiating body 3 and each of the heat conducting rods 2 may be any type, and may be connected by a bonding agent, connected through a connecting tool, or connected by fitting or engaging. You may do it. For example, as shown in FIG. 4A, the lower surface of the heat dissipating rod 31 and the side surface of the heat conducting rod 2 may be detachably connected with a bolt via a connector 61, or as shown in FIG. As described above, the protrusion 63 provided on the upper end surface of the heat conducting rod 2 may be detachably fitted in the fitting hole 62 provided on the lower surface of the heat radiating rod 31.

  The ground surface G1 is a surface (snow surface) on which snow S falling from above hits, and includes not only the ground but also the entrance of a building, a paved passage, and the like. That is, the surface of the place where the snow S to be melted by the geothermal snow melting facility 1 is accumulated.

  Furthermore, a top plate (not shown) for a person to walk is laid on the upper surface of the radiator 3. And the geothermal heat conducted from the heat conducting rod 2 is radiated from the radiator 3 to the outside and the surroundings. The size and number of the radiator rods 31 (the heat radiation area of the radiator 3) are It is set so that the snow S on the ground surface G1 (on the top plate of the radiator 3) is melted by the radiated heat.

  Specifically, first, the number of the heat conductive rods 2 arranged per unit area is set so that the snow S is melted by the heat radiation from the heat radiator 3. For example, when the heat conducting rod 2 is made of carbon nanotubes and the outer diameter of the lower end side 21 is 10 cm, calculation and setting are performed as follows.

The amount of heat Q transmitted to one heat conducting rod 2 is obtained by the following equation.
Q = λ × S × (TH−TL) ÷ L
λ: thermal conductivity (5,500 W / (m · K) for carbon nanotube)
S: cross-sectional area of the heat conducting rod 2 (0.0079 m ² )
TH: Higher temperature (the temperature at the lower end 21 is 10 ° C.)
TL: Lower temperature (temperature on the ground surface G1 side, 0 °)
L: Length of the heat conduction rod 2 (assumed to be 5 m)
Q = 5,500 × 0.0079 × (10−0) ÷ 5 = 86.9J
= 20.77 cal / book

Heat QL required to comb the 1cm piled up snow 1 hour 1 m ² is obtained by the following equation.
QL = 80,000 cal × M = 80,000 cal × (ρ × R)
80,000: Heat of melting of ice M: Amount of snowfall per unit area ρ: Density of fresh snow (assumed to be 60 kg / m ³ )
R: Snowfall (0.01m / h)
QL = 80,000 × (60 × 0.01) = 48,000cal

When this is converted into the amount of heat per sectional area of the heat conducting rod 2,
48,000 cal × 0.0079 m ² = 379.2 cal
Therefore, the number of the heat conducting rods 2 necessary for melting snow that accumulates 1 cm per 1 m ² in 1 hour is:
379.2 cal ÷ 20.77 cal / line = 18.26≈20 lines / m ² .

  And the size (cross-sectional area, surface area), the number of arrangements, and the arrangement of the radiation bars 31 so that the snow S is melted by the geothermal heat conducted from the heat conduction bars 2 with the number of arrangements to the radiator 3. The position is calculated and set.

  According to the geothermal snow melting facility 1 having such a configuration, the geothermal heat collected on the lower end side 21 of the plurality of heat conducting rods 2 is conducted to the heat radiating body 3 and is radiated from the heat radiating body 3, and the ground surface is heated by this geothermal heat. The snow S on G1 (on the radiator 3) melts.

  Thus, since the snow S on the ground surface G1 is melted by geothermal heat, electricity and water are unnecessary, and it can be applied to various places, and the running cost can be reduced. Moreover, since the outer peripheral surface of the heat conducting rod 2 is covered with the heat insulating material 4 except for the lower end side 21, the geothermal heat collected on the lower end side 21 of the heat conducting rod 2 is efficiently and effectively the upper end side 22. And it is conducted to the radiator 3 and the snow S can be melted effectively. And by providing such a geothermal snow melting facility 1 around the passage of electric power facilities, fence doors, etc., it becomes possible to respond quickly, appropriately and smoothly in an emergency.

  On the other hand, since it is only necessary to embed a plurality of heat conducting rods 2 in the underground G and dispose the radiator 3 along the ground surface G1, the installation is easy and the installation cost can be kept low. It becomes possible to apply to various places. In other words, since it is only necessary to dig a buried hole in the underground G with a drill or the like to embed the heat conduction rod 2, it is not necessary to dig up the underground G widely and deeply, and it can be easily installed at low cost. And it is reduced that the application is restricted by the surrounding environment or the like. Moreover, since electricity and water are not required and the configuration is simple, the occurrence of failures can be reduced, and maintenance costs can be reduced.

  In addition, since the radiator 3 is configured by arranging the plurality of radiator rods 31 in a lattice shape, it is possible to effectively radiate geothermal heat with a small amount of material. That is, it is possible to effectively dissipate geothermal heat by increasing the surface area, and the material can be suppressed as compared with the case where carbon nanotubes are spread over the entire surface. In addition, since the radiator 3 is configured by connecting the plurality of radiator rods 31, the radiator 3 suitable for the installation location and the surrounding environment can be easily changed by simply changing the arrangement position (layout) of the radiator rod 31. It can be configured and has high convenience and flexibility. Further, when some of the heat radiating rods 31 are damaged, only the heat radiating rods 31 need be repaired or replaced, so that it is possible to respond quickly and appropriately at low cost.

  By the way, when the outside air temperature is higher than the geothermal temperature in summer or the like, heat is conducted from the radiator 3 toward the heat conducting rod 2. That is, the heat of the outside air is conducted to the underground G, and a cooling effect can be obtained. For this reason, for example, heat stroke etc. can be suppressed by providing this geothermal type snow melting facility 1 in the place where work is frequently performed.

(Embodiment 2)
FIG. 5 is a plan view (a) showing the geothermal snow melting facility 10 according to this embodiment, and an AA cross-sectional view (b) thereof. In this embodiment, the shape of the heat radiating body 3 is different from that of the first embodiment, and the same components as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  The radiator 3 of this embodiment is a flat plate, and a plurality of panel-like (flat plate) heat radiating plates 35 that radiate geothermal heat are arranged on the same horizontal plane. That is, the heat radiation plate 35 has a substantially rectangular planar shape, and a fitting hole 35b for fitting and connecting the upper end side 22 of the heat conducting rod 2 is formed at the center of the lower surface. In addition, a stepped portion 35a is formed on a pair of opposite side portions of the heat radiating plate 35, and the stepped portions 35a of the adjacent radiating plates 35 are overlapped with each other so that the plurality of radiating plates 35 do not have a gap and are not displaced. They are arranged on the same horizontal plane.

  A desired number of such heat radiating plates 35 are arranged in accordance with the snow melting area to form the heat radiating body 3, and the heat radiating body 3 is arranged along the ground surface G1. Further, the upper end side 22 of the heat conducting rod 2 is fitted into the fitting hole 35 b of each heat radiating plate 35, and each heat conducting rod 2 and the radiator 3 are connected.

  According to such an embodiment, since the radiator 3 is flat and does not have a gap, the ground heat from the heat conducting rod 2 is conducted on the entire surface of the radiator 3 on an average, and the ground surface G1 (the radiator 3). It becomes possible to melt the snow S of the top) evenly.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above embodiment, the heat conducting rod 2 and the heat radiating body 3 are made of copper or carbon nanotubes, but may be made of other highly heat conductive materials, and copper and carbon nanotubes may be made of You may comprise combining. For example, the main body may be composed of carbon nanotubes, and the parts requiring strength and rigidity such as outer shells and connecting portions may be composed of copper.

1, 10 Geothermal snow melting equipment 2 Heat conduction rod 21 Lower end side (heat collecting part)
22 Upper end side 3 Radiator 31 Radiator 4 Heat insulation material S Snow G Underground G1 Ground surface

Claims (3)

A plurality of heat conducting rods that have a high thermal conductivity in a rod shape, extend in the vertical direction and are embedded in the ground, and conduct geothermal heat collected at the lower end side to the upper end side;
A heat radiator having high thermal conductivity, connected to the upper end side of the heat conduction rod, arranged along the ground surface, and radiating the geothermal heat conducted from the heat conduction rod,
A geothermal snow melting facility characterized by comprising: The outer peripheral surface of the heat conducting rod is covered with a heat insulating material except for the lower end side,
The geothermal snow melting facility according to claim 1. The radiator is configured by arranging a plurality of rod-shaped radiator rods that dissipate geothermal heat in a grid pattern,
The geothermal snow melting facility according to any one of claims 1 and 2.

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