JP7161189B2 - Water storage facility - Google Patents

Description

TECHNICAL FIELD The present invention relates to a water storage utilization facility that adjusts the temperature of water in a water storage tank using geothermal heat such as groundwater so that the water can be used, for example, for melting snow or refrigerating and air-conditioning equipment.

Conventionally, when snow is melted, after the roads and parking lots are covered with snow, cold temperature accumulates on the road surface and roadbed, so energy for melting the snow is large. Therefore, before the snow piles up, the road surface is heated by a road heating device, or water is sprinkled on the road surface to melt the snow.
In addition, road heating devices using electric heaters raise the temperature of roads and roadbeds to indirectly melt snow, so the temperature of the heat source medium arranged in the shape of a tree trunk must be 15°C or higher. and the electricity consumption will increase.
On the other hand, when water is directly sprayed on the snow to melt it, a water temperature of about 3 to 4°C is sufficient. However, it is difficult to use groundwater, lake water, river water, or seawater as the water source due to legal restrictions.

Therefore, for example, in the invention described in Patent Document 1, snowmelt water and rainwater are stored in a water tank buried underground, and the temperature of this water is adjusted by geothermal heat such as groundwater before being used.

JP 2011-38376 A

However, in the above-mentioned prior art, the structure is complicated due to the use of a two-tank type water tank, and the geothermal heat is conducted to a metal heat collecting material, which improves the heat collecting effect and the heat transfer effect. There was room for

In view of such problems, the present invention comprises the following configurations.
First, a water storage utilization facility that includes a water tank embedded in the ground and a heat transfer pipe that penetrates the outer wall of the water tank, and uses the water that is stored in the water tank by pumping it up, wherein the heat transfer pipe has, on one end side, a tank-inside water-passage section that communicates with the inside of the water tank, and on the other end side that extends outside the water tank, has a geothermal absorption pipe part that is sealed against the ground, The water storage utilization facility is characterized by comprising a stirring device for forcibly stirring the water in the heat transfer tubes .
Secondly, a water storage utilization facility comprising a water tank embedded in the ground and a heat transfer pipe penetrating the outer wall of the water tank, wherein the water stored in the water tank is pumped up and used, wherein the heat transfer pipe has, on one end side, a tank-inside water-passage section that communicates with the inside of the water tank, and on the other end side that extends outside the water tank, has a geothermal absorption pipe part that is sealed against the ground, The stored water utilization equipment is characterized in that a return pipe is provided to guide water from outside the water tank into the water tank, and an outlet of the return pipe is arranged inside the heat transfer pipe.
Thirdly, in a water storage utilization facility comprising a water tank embedded in the ground and a heat transfer pipe penetrating the outer wall of the water tank, the water stored in the water tank is pumped up and used, wherein the heat transfer pipe has, on one end side, a tank-inside water-passage section that communicates with the inside of the water tank, and on the other end side that extends outside the water tank, has a geothermal absorption pipe part that is sealed against the ground, The water storage utilization facility is characterized by comprising auxiliary heat absorption equipment for circulating the water pumped up from the water storage tank to the solar heat absorption pipe and returning it to the water storage tank.

Since the present invention is configured as described above, it is possible to efficiently adjust the temperature of water stored in the water tank with a simple structure.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows a schematic structure about the 1st embodiment of the water storage utilization installation which concerns on this invention. It is a cross-sectional perspective view which shows a schematic structure about the 2nd embodiment of the water storage utilization facility which concerns on this invention. FIG. 3 is a vertical cross-sectional view showing a schematic structure of a third embodiment of water storage utilization equipment according to the present invention. It is the figure which looked the water storage utilization facility of FIG. 3 from the left side, and has shown the principal part in the longitudinal cross-sectional view.

The present embodiment discloses the following features.
A first feature is a water storage utilization facility that includes a water tank embedded in the ground and a heat transfer pipe that penetrates the outer wall of the water tank, and uses the water stored in the water tank by pumping it up. The heat transfer pipe has a tank-inside water passage communicating with the inside of the water tank on one end side, and a geothermal absorption pipe sealed against the ground on the other end side extending outside the water tank. (See Figure 1).
Here, the "outer wall" includes a side wall portion positioned on the lateral side of the water tank, a bottom wall portion positioned on the bottom side of the water tank, and the like.
According to the above configuration, the water in the water storage tank flows into the heat transfer tube via the tank inner water passage portion. In this state, when underground heat is transmitted to the geothermal absorption pipe, the heat is transmitted to the water inside the geothermal absorption pipe through the pipe wall. Water flows in a range from inside the heat transfer tube to inside the water tank due to a convection phenomenon or the like caused by a temperature difference. Therefore, the temperature of the water in the water tank is adjusted by the geothermal heat generated by the groundwater outside the water tank.

As a second feature, in order to effectively absorb geothermal heat, the heat transfer tubes are provided vertically through the bottom wall of the water tank (see FIGS. 1 to 3).

As a third feature, in order to improve the geothermal absorption efficiency and workability, a helical threaded portion is provided on the outer peripheral portion of the geothermal absorption pipe (see FIG. 2).

A fourth feature is that, in order to effectively collect surface water, a first collection tank into which surface water is poured, a second collection tank partitioned from the first collection tank and installed in parallel, A water passage for guiding the upper layer water in the first collection tank into the second collection tank, and the water in the second collection tank is guided into the water storage tank (see FIGS. 2 and 3). .

A fifth feature is that a stirrer for forcibly stirring the water in the heat transfer tubes is provided in order to make the temperature of the stored water even and uniform (see FIG. 1).

The sixth feature is that in order to promote convection in the heat transfer tube, a return pipe is provided to guide water outside the water tank into the water tank, and the outlet of the return pipe is arranged inside the heat transfer tube (Fig. 3 and FIG. 4).

A seventh feature is that the water pumped from the water tank is circulated through the solar heat absorption pipes and returned to the water tank in order to transfer heat to the water tank (see FIGS. 3 and 4). ).

<First Embodiment>
Next, specific embodiments having the above characteristics will be described in detail with reference to the drawings.
This water storage utilization facility 1 includes a water storage tank 10, and a plurality of first heat transfer tubes 20 and second heat transfer tubes 30 penetrating through a bottom wall portion 11 and a side wall portion 12 of the water storage tank 10, and an aquifer A1. , A2, pumps up water stored in the water tank 10, and is used for snow melting, refrigeration and air conditioning.

The water tank 10 has a rectangular parallelepiped box-shaped tank main body 10a with an upper opening, and a lid portion 10b that closes the opening of the tank main body 10a.

The tank main body 10a is integrally composed of a bottom wall portion 11 having a rectangular shape in plan view and side wall portions 12 rising upward from the four corner sides of the bottom wall portion 11. The bottom wall portion 11 has a plurality of first transmissions. It penetrates the heat tube 20 and penetrates the side wall portion 12 through the second heat transfer tube 30 .
Then, as shown in FIG. 1, the tank main body 10a is arranged such that the side wall portion 12 and the second heat transfer tube 30 are brought into contact with a relatively shallow aquifer A1 in which subsoil water permeates, and a relatively deep aquifer A1 in which groundwater permeates is brought into contact. The first heat transfer tube 20 is brought into contact with the aquifer A2 and buried in the ground.

The water tank 10 includes, for example, a water supply pipe 10c that penetrates the lid portion 10b to supply rainwater, snowmelt water, etc., a forward pipe 10d that transfers water pumped up by a pump (not shown) to the utilization equipment, and the utilization equipment side. A return pipe 10e for returning heat-exchanged water to the tank main body 10a, a drain pipe (not shown) for draining water overflowing in the tank main body 10a to the outside, etc. It is arranged as follows.

The first heat transfer pipe 20 has a tank inner water passage portion 21 communicating with the inside of the tank main body 10a on one end side, and a geothermal absorption pipe portion 22 on the other end side extending outside the tank main body 10a. According to the illustrated example, the first heat transfer pipes 20 are provided in a vertical shape penetrating the bottom wall portion 11 of the water tank 10, and a plurality of them are arranged at intervals in the horizontal direction.
Each first heat transfer pipe 20 has a tank inner water passage part 21 opened at the upper end side arranged in the water in the tank main body 10a, and a geothermal absorption pipe part 22 at the lower end side arranged in the aquifer A2. .
This first heat transfer tube 20 is made of a metal material with a relatively high thermal conductivity.

The geothermal heat absorption pipe portion 22 extends downward from the bottom wall portion 11 and is formed in a bottomed tubular shape without through-holes (holes, slits, etc.) in the thickness direction so as to be sealed against the ground. . The outer peripheral surface of this geothermal absorption pipe portion 22 is in contact with the groundwater of the aquifer A2.

Further, according to a preferred example of the present embodiment, a stirrer 23 is provided in the first heat transfer tube 20 to force the water in the heat transfer tube to flow.
That is, the water in the first heat transfer tube 20 undergoes natural convection due to the difference in temperature between the top and bottom, and the stirring device 23 is provided to promote this convection.

A preferred example of the stirring device 23 is a bubble pump. The bubble pump blows out air supplied from an air pump and piping (not shown) from the bottom side of the geothermal absorption pipe 22 to generate a large number of bubbles in the water inside the geothermal absorption pipe 22 . Therefore, the water on the bottom side of the geothermal absorption pipe portion 22 is moved upward by the buoyancy of the air bubbles, and water convection occurs between the geothermal absorption pipe portion 22 and the tank main body 10a. This convection agitates the water in the geothermal absorption pipe portion 22 and the tank main body 10a.

Other examples of the agitator 23 include an axial-flow submersible pump that sucks water from one side and discharges it to the other side, and a water pump that vigorously pushes water inside or outside the water tank 10 into the geothermal absorption pipe portion 22 . Appropriate structures such as a device that ejects water, a device that rotates wings in water, and the like can be used.

In addition, the second heat transfer pipe 30 is formed in a continuous tubular shape that penetrates the entire water tank 10 in a substantially horizontal direction, and has an underground water passage portion 31 on one end side and the other end side thereof. and the underground side water passage portion 31 on the other end side is used as the tank inner heat radiation pipe portion 32 .
According to the illustrated example, a plurality of the second heat transfer tubes 30 are provided at intervals in the vertical direction, and if necessary, a plurality of the second heat transfer tubes 30 are also provided in the horizontal direction (the depth direction in FIG. 1).
This second heat transfer tube 30 is made of a metal material with a relatively high thermal conductivity.

Each center-side water passage portion 31 protrudes from the side wall portion 12 of the water tank 10 and extends into the underground aquifer A1. The end portion and/or peripheral wall portion of the underground water passage portion 31 is provided with an opening through which the groundwater (subsoil water) of the aquifer A1 can pass. A strainer (not shown) made of, for example, a slit, a small hole, a fibrous material, or the like is provided so as to block the flow of groundwater.

The tank inner radiator pipe part 32 extends substantially horizontally between the side wall parts 12, 12 of the tank main body 10a, and the peripheral wall is formed into a cylindrical shape without a penetrating part. The outer peripheral surface of the tank inner radiator pipe portion 32 is in contact with the water stored in the water tank 10 .

Next, the characteristic functions and effects of the water storage utilization facility 1 having the above configuration will be described in detail.
Outside water such as rain water or snowmelt water is supplied into the water tank 10 through a replenishment pipe 10c. This water is stored in the water tank 10 so as to submerge the plurality of second heat transfer tubes 30 and the first heat transfer tubes 20 . Then, this stored water circulates through the user-side equipment through the forward pipe 10d, the return pipe 10e, and the like. Moreover, the water overflowing in the water tank 10 is discharged to the outside through a drain pipe (not shown).

The first heat transfer pipe 20 absorbs the groundwater heat of the aquifer A2 by bringing the outer surface of the geothermal absorption pipe portion 22 into contact with the aquifer A2. This heat is then transferred to the water in the first heat transfer tube 20 . Convection occurs in the water in the first heat transfer tube 20 due to the temperature difference between the top and bottom and the action of the stirring device 23, etc. This convection causes the water to flow from the tank main body 10a into the first heat transfer tube 20, And a flow of water from inside the first heat transfer tube 20 to inside the tank main body 10a is formed.

On the other hand, the second heat transfer pipe 30 brings the tank inner heat radiation pipe portion 32 into contact with the water in the water tank 10, and brings the underground water passage portions 31 on both sides into contact with the aquifer A1.
Groundwater intrudes into the underground water passage portion 31 through a strainer (not shown), and this water reaches the inside of the tank inner radiator pipe portion 32 . Then, the heat of this water is transmitted to the stored water in the water tank 10 via the tube wall of the tank inner radiator tube portion 32 .

Therefore, the water in the water tank 10 can be adjusted to a substantially uniform temperature by heat exchange between the water in the water tank 10 and the ground water in the aquifers A1 and A2, and by convection and agitation of the water. can be done. Then, the stored water at a stable temperature in the water tank 10 can be supplied to the user-side facilities on the ground.
Moreover, since the stored water in the water tank 10 is sealed against the groundwater, it is possible to prevent groundwater components (for example, iron, manganese, etc.) from being mixed into this stored water. It is possible to prevent clogging and failure of each device.

<Second embodiment>
Next, other embodiments according to the present invention will be described. In addition, in the embodiments described below, portions that operate in substantially the same manner as the water storage utilization facility 1 are denoted by the same reference numerals, and overlapping detailed descriptions are omitted.

The water storage utilization facility 2 shown in FIG. is configured.

The first heat transfer tubes 40 are made of a metal material having a relatively high thermal conductivity and are formed in a vertically elongated tubular shape, and are provided in plurality at intervals in the horizontal direction.
Each first heat transfer tube 40 penetrates through the bottom wall portion 11 and has a tank inner water passage portion 41 that communicates with the tank main body 10 a above the bottom wall portion 11 . also has a geothermal absorption pipe section 42 on the lower side.

A portion of the first heat transfer tube 40 above the bottom wall portion 11 is cylindrically extended to the ground surface, and an opening at the upper end thereof is closed by a detachable disk-shaped lid member 43. .
The tank-inside water passage part 41 is at a height position submerged in the water tank 10 and is formed in a slit-like shape penetrating the peripheral wall of the first heat transfer tube 40 . Other examples of the tank-inside water-conducting portion 41 may include a large number of holes or penetrating portions of other shapes.

The geothermal absorption pipe part 42 is formed in a substantially bottomed tubular shape without a through-hole in the wall part in the thickness direction so as to be sealed against the ground, and at least a part thereof is arranged in the aquifer A2. .
A threaded portion 42a is provided on the outer peripheral portion of the geothermal absorption pipe portion 42 in the form of a helical male screw. This screw portion 42a is used to insert the lower end side of the first heat transfer tube 40 into the bottom wall portion 11 of the water tank 10 and bury it in the ground while rotating it like a drill. Furthermore, the screw portion 42a secures a large outer surface area of the geothermal heat absorption pipe portion 42, thereby improving the heat transfer efficiency.

The user-side equipment 50 constitutes a snow melting equipment that melts the snow by sprinkling the water pumped up from the water tank 10 on falling snow and accumulated snow.
This user-side equipment 50 includes a pump 51a and a forward pipe 51b for pumping up the water stored in the water tank 10, a plurality of sprinklers 52a connected to the downstream side of the pipe branched from the forward pipe 51b, and a snowfall state. a snowfall sensor 52b, a control panel 52c for controlling the pump 51a in response to a detection signal from the snowfall sensor 52b, a first collection tank 53a into which surface water is poured, and a first collection tank 53a. A second water collection tank 53b, a water passage 53c that guides the upper layer water in the first water collection tank 53a into the second water collection tank 53b, and a water flow path 53c that guides the water in the second water collection tank 53b into the water tank 10. A return pipe 54 and a drain pipe 55a and a drain tank 55b for draining water overflowing in the water tank 10 are provided.

The pump 51 a is a submersible pump that is submerged in the water tank 10 .
The forward pipe 51b extends upward from the discharge port of the pump 51a and branches in multiple directions near the ground surface outside the water tank 10 . A sprinkler device 52a is connected to each of these branched pipes.

A known sprinkler, for example, can be used for the sprinkler device 52a.
The snowfall sensor 52b is configured to detect snowfall with infrared rays and output a detection signal. As another example of this snowfall sensor, it is also possible to use a moisture detection type or other types.
The control panel 52c controls ON/OFF of the pump 51a according to the detection signal of the snowfall sensor 52b. That is, when snowfall is detected by the snowfall sensor 52b, the control panel 52c drives the pump 51a, and the water pumped up by the pump 51a is discharged from the plurality of sprinklers 52a.

The first water collection tank 53a is arranged so as to be located on the downstream side of the flowing water on the inclined surface, and according to the illustrated example, is provided in the form of grooves on both sides in the width direction of the road surface.
The second water collection tank 53b is a groove arranged in parallel with the first water collection tank 53a (see FIG. 2).

A water passage 53c is provided between the first water collection tank 53a and the second water collection tank 53b so that upper layer water on the first water collection tank 53a side flows to the second water collection tank 53b.
A suction port of the return pipe 54 is connected to the second collection tank 53b. The return pipe 54 is provided with a downward slope from the second water collection tank 53 b toward the first heat transfer pipe 40 . A downstream portion of the return pipe 54 is inserted through the first heat transfer pipe 40 , and an outlet 54 a on the lower end side thereof is arranged within the geothermal heat absorption pipe portion 42 .

The drain pipe 55a has its suction port arranged in the water tank 10, and extends downwardly to the outside of the water tank 10 through the side wall portion 12 of the water tank 10, and has a discharge port on the downstream side thereof. It is located inside the water tank 55b. According to the illustrated example, the drainage tank 55b is formed in a groove shape, and drains the stored drainage to a drainage facility (not illustrated).

Next, the characteristic functions and effects of the water storage utilization facility 2 having the above configuration will be described in detail.
When snowfall is detected by the snowfall sensor 52b, the pump 51a is driven by a command from the control panel 52c, and the water in the water tank 10 is pumped up and flows through the forward pipe 51b. Then, this water is sprinkled on the road surface and the like by the sprinklers 52a on the downstream side of the pipes branched from the forward pipe 51b, respectively, to melt the snow.

Residual water from the water sprinkling, snowmelt water, and the like flow down the slope of the road surface and enter the first collection tank 53a. In the first water collection tank 53a, mud, foreign substances, etc. accumulate at the bottom, and the water in the upper layer is flowed to the adjacent second water collection tank 53b through the water passage 53c.
Then, the water in the second collection tank 53b is guided into the first heat transfer pipe 40 by the return pipe 54, and jets out from the outlet 54a in the geothermal heat absorption pipe portion 42 on the lower end side of the first heat transfer pipe 40. .

Therefore, the water in the first heat transfer tube 40 moves as if pushed by the jetted water from the outlet 54a of the return pipe 54, and the water stored in the first heat transfer tube 40 and the water tank 10 is agitated.

On the other hand, the heat of the aquifer A2 is transferred to the outer surface and the threaded portion 42a of the geothermal absorption pipe portion 42, and this heat is further transferred to the water in the geothermal absorption pipe portion 42. Also, the heat of the aquifer A1 is transmitted to the stored water in the water tank 10 via the side wall portion 12 of the water tank 10 .

Therefore, the heat exchange between the water stored in the water tank 10 and the groundwater of the aquifers A1 and A2, and the convection and agitation of the water in the first heat transfer tube 40 and the water tank 10 make the water uneven. can be adjusted to a substantially uniform temperature.
Then, the stored water at a stable temperature (for example, about 3 to 4° C.) can be sprayed on the road surface via the user-side equipment 50 on the ground to effectively melt the accumulated snow and snowfall on the road surface.

<Third embodiment>
The water storage utilization equipment 3 shown in FIGS. and an auxiliary heat absorption facility 60 (solar heat absorption facility) for returning the heat to the water tank 10'.

The water tank 10' is obtained by replacing the tank body 10a of the water tank 10 with a tank body 10a'.
The tank main body 10a' is constructed in the shape of a building whose lower side is buried in the ground and whose upper side is exposed above the ground. The upper end of the tank main body 10a' is formed in a slanted shape, and an auxiliary endothermic device 60 is mounted thereon.

A pump 51a is provided in the tank main body 10a', and a forward pipe 51b is connected to the discharge port of the pump 51a. The downstream side of the forward pipe 51b extends outside the tank main body 10a' and is branched into a plurality of branches.
The pump 51a and the water sprinkler 52a are controlled by an external snowfall sensor, a control panel, etc. (not shown) in substantially the same manner as the water storage utilization facility 2, and sprinkle water according to snowfall conditions.

Further, a return pipe 56a is inserted through the tank main body 10a' so that a discharge port 56c is arranged below the surface of the stored water. The upstream side of this return pipe 56 is configured to pump up the water in the second collection tank 53b.
That is, a first collection tank 53a, a second collection tank 53b and a water passage 53c are provided outside the tank main body 10a' in substantially the same manner as the water storage utilization facility 2 described above. A pump 56b is provided in the second collection tank 53b, and the discharge port of the pump 56b is connected to the inlet of the return pipe 56a.

The first heat transfer tube 20' is the first heat transfer tube 20 (see FIG. 1) from which the stirring device 23 as a bubble pump is omitted, and is spaced from the bottom wall portion 11 of the water tank 10'. can be provided multiple times.

In addition, the auxiliary heat absorption equipment 60 is provided in the shape of a sloping roof at the upper end of the tank body 10a'. The auxiliary heat absorption equipment 60 has meandering solar heat absorption pipes 61 arranged in a meandering manner so as to be exposed to sunlight.

A forward pipe 62 is connected to the suction portion of the solar heat absorption pipe 61 so as to introduce water pumped up by a pump 63 in the water tank 10' (see FIG. 4). The pump 63 is appropriately controlled according to the temperature of the water stored in the water tank 10'.
That is, when the temperature of the stored water is lower than a preset threshold value, the pump 63 is turned on, and hot water from the auxiliary heat absorption equipment 60 is supplied into the water tank 10'. Further, when the temperature of the stored water is equal to or higher than the threshold value, the pump 63 is turned off and the supply of hot water is stopped.

A return pipe 54 (see FIG. 3) is connected to the discharge port of the solar heat absorption pipe 61 . This return pipe 54 is guided into the first heat transfer pipe 20 ′ in substantially the same manner as the water storage utilization facility 2 (see FIG. 2), and its outlet 54 a is arranged within the geothermal absorption pipe section 22 .

In FIG. 3, reference numeral 53d denotes a drain pipe for draining the water overflowing in the second collection tank 53b to the outside, and reference numeral 57 denotes a drain pipe for draining the water overflowing in the water storage tank 10' to the outside. be.

Therefore, according to the water storage utilization facility 3 configured as described above, heat exchange is performed between the stored water in the water storage tank 10' and the groundwater of the aquifer A1 in substantially the same manner as the water storage utilization facilities 1 and 2. can maintain the water in the water tank 10' at a suitable temperature.
Moreover, when the outside air temperature is too low and the water temperature in the water tank 10' is difficult to rise, the pump 51a is operated to pump water heated by solar heat through the auxiliary heat absorption equipment 60 into the water tank 10'. can be fed into
In addition, the water in the water tank 10' is discharged from the auxiliary heat absorption equipment 60 into the first heat transfer tube 20' by the jet flow of the return pipe 54, or from the second water collection tank 53b to the tank main body 10a'. The water is agitated by the jet flow of 56a or the like, and kept at a substantially uniform water temperature with little unevenness.

According to the above embodiment, the water storage utilization facilities 1, 2, and 3 are the snow melting facilities, but the water storage utilization facilities according to the present invention may be other facilities or devices that draw up and use the water in the water storage tank. For example, the water in the water tank can be pumped up and used as cooling water for refrigerating and air-conditioning equipment (including air conditioners, chillers, cold chain equipment, etc.).

The present invention is not limited to the embodiments described above, and can be modified as appropriate without changing the gist of the present invention.

1, 2, 3: Water storage utilization equipment 10: Water storage tank 10a: Tank main body 10d, 51b, 62: Outgoing pipe 10e, 54, 56a: Return pipe 11: Bottom wall part 12: Side wall part 20, 40: First transmission Heat pipes 21, 41: Tank inner water passage part 22, 42: Geothermal absorption pipe part 23: Stirrer 30: Second heat transfer pipe 31: Underground side water passage part 32: Tank inner heat radiation pipe part 42a: Screw part 50: User side equipment 52a: Sprinkler 53a: First collection tank 53b: Second collection tank 53c: Water passage 60: Auxiliary heat absorption equipment (solar heat absorption equipment)
61: Solar heat absorption tube A1: Aquifer A2: Aquifer

Claims (3)

A water storage utilization facility comprising a water tank embedded in the ground and a heat transfer pipe penetrating the outer wall of the water tank, wherein the water stored in the water tank is pumped up and used,
The heat transfer pipe has, on one end side thereof, a tank-inside water-passage portion communicating with the inside of the water tank, and on the other end side extending outside the water tank, a geothermal absorption pipe portion sealed against the ground. have
A water storage utilization facility comprising a stirring device for forcibly stirring the water in the heat transfer tubes .
A water storage utilization facility comprising a water tank embedded in the ground and a heat transfer pipe penetrating the outer wall of the water tank, wherein the water stored in the water tank is pumped up and used,
The heat transfer pipe has, on one end side thereof, a tank-inside water-passage portion communicating with the inside of the water tank, and on the other end side extending outside the water tank, a geothermal absorption pipe portion sealed against the ground. have
A stored water utilization facility , comprising: a return pipe for introducing water from outside the water tank into the water tank, and an outlet of the return pipe being disposed within the heat transfer pipe .
A water storage utilization facility comprising a water tank embedded in the ground and a heat transfer pipe penetrating the outer wall of the water tank, wherein the water stored in the water tank is pumped up and used,
The heat transfer pipe has, on one end side thereof, a tank-inside water-passage portion communicating with the inside of the water tank, and on the other end side extending outside the water tank, a geothermal absorption pipe portion sealed against the ground. have
A water storage utilization facility comprising auxiliary heat absorption equipment for circulating water pumped up from the water storage tank through a solar heat absorption tube and returning the water to the water storage tank .

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