JP7316686B2 - Heat utilization device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat utilization device that utilizes the heat of a heat medium fluid stored in a storage tank.

In the groundwater heat utilization facility described in Patent Literature 1, groundwater is circulated through a snow melting facility of a closed tube-like closed circuit type embedded in the ground, and is used for snow melting or the like.

Japanese Patent Application Laid-Open No. 2006-009335

By the way, the closed circulation circuit type snow melting equipment can also be used to collect heat and cold heat from the ground. However, if the closed circulation circuit type snow melting equipment of the conventional structure is used as it is for heat collection, there is a concern that the heat collection capacity will be insufficient.

In view of such problems, the present invention comprises the following configurations.
a heat medium fluid storage tank that stores a heat medium fluid that is brine; and heat of the heat medium fluid that is brine sucked from the heat medium fluid storage tank is heat-exchanged with external heat to heat the heat medium fluid storage tank. and a heat collection piping system connected so as to return to the heat medium fluid storage tank, and the heat medium fluid, which is brine sucked from the heat medium fluid storage tank, is passed through utilization equipment and is connected so as to return to the heat medium fluid storage tank. Equipped with a utilization piping system,
The heat collection piping system is for flowing the heat medium fluid that is brine, and is connected to an underground heat exchanger that is buried in the ground and an outside air heat exchanger that is exposed to the outside air. The heat carrier fluid is returned to the heat carrier fluid reservoir , and the heat carrier fluid reservoir comprises an outer tubular portion embedded in the ground and an inner tubular portion embedded in the outer tubular portion. A water passage penetrating inside and outside is provided in the peripheral wall of the outer tubular portion, and the water passage is provided between the inner tubular portion and the outer tubular portion via the water passage. A groundwater storage chamber for storing inflowing groundwater is provided, and the inner cylindrical portion has an inner space serving as a heat medium fluid storage chamber for storing the heat medium fluid, and the heat medium fluid storage chamber and the heat medium fluid storage chamber. A heat insulating material is provided on the upper end side between the inner cylindrical portion and the outer cylindrical portion, and the groundwater storing chamber is provided below the heat insulating material. and a heat utilization device, wherein the water passage is provided.

ADVANTAGE OF THE INVENTION Since this invention is comprised as demonstrated above, a heat collecting ability can be improved effectively.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows typically an example of the heat utilization apparatus which concerns on this invention. It is a front view which shows an example of the outside air heat exchanger in the heat utilization apparatus. It is a front view which shows the other example of an outside air heat exchanger.

The present embodiment discloses the following features.
A first feature is a heat medium fluid storage tank that stores a heat medium fluid, and the heat of the heat medium fluid sucked from the heat medium fluid storage tank is heat exchanged with external heat and returned to the heat medium fluid storage tank. and a utilization piping system connected by piping so that the heat medium fluid sucked from the heat medium fluid storage tank is passed through utilization equipment and returned to the heat medium fluid storage tank. The heat collection piping system connects an underground heat exchanger embedded in the ground with an outside air heat exchanger exposed to the outside air (see FIGS. 1 and 2).

As a second feature, the outside-air heat exchanger has an underground pipe part embedded in the ground and an exposed pipe part that is connected to the underground pipe part in a communication manner and is exposed to the outside air. , through which the heat carrier fluid flows (see FIGS. 1 and 2).

As a third feature, the exposed tube portion is formed in a tubular shape that stands up vertically (see FIGS. 1 and 2).

As a fourth feature, the heat medium fluid storage tank is configured in a double tubular shape by including an outer tubular portion embedded in the ground and an inner tubular portion embedded in the outer tubular portion, A water passage penetrating inside and outside is provided in the peripheral wall of the outer tubular portion, and a groundwater storage chamber for storing groundwater flowing through the water passage is provided between the inner tubular portion and the outer tubular portion. is provided, and the inner cylindrical portion has an inner space as a heat medium fluid storage chamber for storing the heat medium fluid, and the heat medium fluid storage chamber and the groundwater storage chamber are watertightly separated from each other. (see Figure 1).

As a fifth feature, a heat insulating material is provided on the upper end side between the inner cylindrical portion and the outer cylindrical portion, and the groundwater storage chamber and the water passage are provided below the heat insulating material. (See Figure 1).

<Specific embodiment>
Next, specific embodiments having the above characteristics will be described in detail with reference to the drawings.

FIG. 1 shows an example of a heat utilization device according to the present invention.
This heat utilization device includes a heat medium fluid storage tank 1 which is buried underground and stores a heat medium fluid B, and a heat medium fluid B sucked from the heat medium fluid storage tank 1, which exchanges heat with external heat to generate heat. A heat collection piping system 2 connected so as to return to the medium fluid storage tank 1, and a heat medium fluid B sucked from the heat medium fluid storage tank 1 is passed through the utilization equipment X and returned to the heat medium fluid storage tank 1. The heat of the heat medium fluid B whose temperature is adjusted by the underground water and the heat collection piping system 2 is utilized in the utilization piping system 3 .

The underground in which the heat medium fluid storage tank 1 is buried has an impermeable layer and an aquifer. An aquifer is a stratum containing water formed between upper and lower impermeable layers. Consists of rocks, rarely basalt, igneous layers of interspersed lava, or layers of porous, hollow limestone. The heat medium fluid storage tank 1 of the illustrated example is buried so as to be inserted through an impermeable layer and an aquifer below it.

The heat medium fluid storage tank 1 has an outer tubular portion 12 buried in the ground and an inner tubular portion 11 embedded in the outer tubular portion 12 to form a double tubular shape.
The heat medium fluid storage tank 1 secures the heat medium fluid storage chamber 1A for storing the heat medium fluid B in the inner cylindrical portion 11, and the outer peripheral surface of the inner cylindrical portion 11 and the outer cylindrical portion 12 are separated from each other. A groundwater storage chamber 1B for temporarily storing groundwater flowing through the water conduit 12a is secured between the inner peripheral surface of the .

The inner cylindrical portion 11 is formed in a bottomed cylindrical shape from a cylindrical peripheral wall portion and a bottom portion at the lower end thereof. The peripheral wall portion of the inner tubular portion 11 is configured, for example, by vertically connecting a plurality of metal pipes.
The peripheral wall portion and the bottom portion of the inner cylindrical portion 11 watertightly partition the heat medium fluid storage chamber 1A and the groundwater storage chamber 1B. An upper end portion of the inner tubular portion 11 is closed by a disk-shaped lid member 13 .

A heat medium fluid B is stored in the inner tubular portion 11 .
The heat transfer medium fluid B is an anticorrosion antifreeze liquid, and is sometimes called brine or the like. A brine antifreeze containing ethylene glycol as a main component, for example, may be used as the heat medium fluid B, but water or other liquids may also be used.

Further, the outer tubular portion 12 is formed in a bottomed tubular shape in which the lower end of a cylindrical peripheral wall portion larger than the outer diameter of the inner tubular portion 11 is closed with a bottom portion.
A heat insulating material 14 is provided on the upper side between the outer cylindrical part 12 and the inner cylindrical part 11, and the space below the heat insulating material 14 serves as an underground water storage chamber 1B.

A plurality of water passages 12a are provided in the peripheral wall portion of the outer cylindrical portion 12 at intervals in the circumferential direction.
Each water passage 12a is formed in a slit shape extending vertically through the peripheral wall portion of the outer cylindrical portion 12 below the heat insulating material 14 .
According to the illustrated example, the water passage 12a is formed in a long shape extending from the impermeable layer in the ground to the aquifer below it, and a plurality of the water passages 12a are provided at intervals in the circumferential direction of the outer cylindrical portion 12. .
The width of each water passage 12a in the circumferential direction is appropriately set so that pebbles (pebbles) around the outer tubular portion 12 are less likely to pass through.

The heat insulating material 14 is provided in a cylindrical shape on the upper end side between the inner tubular portion 11 and the outer tubular portion 12 so that there is no gap.
The heat insulating material 14 is provided within a depth (outside temperature interference depth) in the impermeable layer that is easily affected by the outside temperature.
According to the illustrated example, the total length of the heat medium fluid storage tank 1 is approximately 50 to 100 m, and the total length (dimension in the depth direction) d of the heat insulating material 14 is approximately 10 m.
The material of the heat insulating material 14 is preferably a material that does not absorb water.
According to the heat insulating material 14 having the above configuration, it is possible to prevent the temperature of the heat medium fluid B in the heat medium fluid storage tank 1 from fluctuating due to the outside air temperature.

In the heat collection piping system 2, an underground heat exchanger 25 buried in the ground is connected in series with an outside air heat exchanger 20 exposed to the outside air, and the heat medium fluid B in the inner tubular portion 11 is connected in series. , the air is sucked from the relatively upper layer side, heat-exchanged by the underground heat exchanger 25 and the outside air heat exchanger 20 , and then returned to the inner cylinder part 11 .

Specifically, the heat collection piping system 2 extends upward from the suction port 2a in the inner cylindrical portion 11, penetrates the lid member 13, and extends to the underground heat exchanger 25 near the surface of the ground. A pipe 2b, a pump P provided in the middle of the outgoing pipe 2b for forcibly conveying the heat medium fluid B in the pipe, a return pipe 2c for returning the heat medium fluid B that has passed through the outside air heat exchanger 20 to the inner cylindrical portion 11, etc. Equipped with

According to the example shown in FIG. 1 , the suction port 2a of the forward pipe 2b is located near the upper layer of the heat medium fluid B stored in the inner tubular portion 11 . The discharge port of the return pipe 2c is positioned above the liquid surface of the heat medium fluid B in the inner cylindrical portion 11 .

The underground heat exchanger 25 is, for example, a tubular body wound in a toguro shape or the like, and the heat medium fluid B is circulated inside its peripheral wall, and the outer surface of the peripheral wall is in contact with the ground.
In addition, according to FIG. 1, the underground heat exchanger 25 is coiled in a longitudinal direction (depth direction of the ground), which schematically shows the structure of the underground heat exchanger 25. The actual underground heat exchanger 25 is wound in a substantially horizontal coil shape near the ground surface, and can be used as a road snow melting device in winter.
Moreover, the underground heat exchanger 25 may be formed, for example, in a hairpin coil shape (substantially the same shape as the outside air heat exchanger 20), other than in a ridged shape.

The outside air heat exchanger 20 includes a heat exchanging portion 21 and a support 22 that supports the heat exchanging portion 21, and is configured in a transportable integral manner.
This outside air heat exchanger 20 is provided so that part or all of it is located directly above the underground heat exchanger 25, and a particularly preferable example of the outside air heat exchanger 20 is the underground heat exchanger 25. It is arranged above the underground heat exchanger 25 so as to be included in the horizontal footprint.

The heat exchange unit 21 includes a plurality of straight pipe portions 21a vertically spaced apart in the horizontal direction, and a hairpin pipe portion 21b that alternately connects the upper ends and the lower ends of the straight pipe portions 21a, It has an underground pipe portion 20a embedded in the ground and an exposed pipe portion 20b that is connected to the underground pipe portion in a communication manner and exposed to the outside air, and is configured in a vertically meandering integral tubular shape. .
The upstream end of the heat exchange section 21 is connected in communication with the downstream end of the pipe that constitutes the underground heat exchanger 25, and the downstream end of the heat exchange section 21 is in communication with the return pipe 2c. connected to
The height dimension H of the heat exchange section 21 is set to, for example, about 5 m.

The underground pipe portion 20a is composed of a lower end portion of the straight pipe portion 21a, a lower hairpin pipe portion 21b, and the like, and is buried in the ground.
The exposed pipe portion 20b is composed of a portion of the straight pipe portion 21a above the ground surface and an upper hairpin pipe portion 21b, and is exposed to the outside air.

As shown in FIG. 2, the supporting body 22 includes a rectangular frame 22a, a plurality of hanging tools 22b fixed to the outer periphery of the frame 22a, and a frame on the peripheral side so as to cover the inside of the frame 22a. A mesh member 22c is secured to the body 22a, and the heat exchange section 21 is fixed to the mesh member 22c.

The support body 22 is vertically erected with its lower end buried in the ground, supports the heat exchange section 21 vertically, and circulates air through the meshes of the mesh member 22c to support the heat exchange section 21. Facilitates heat exchange action.
Moreover, the suspension tool 22b is configured by an eyebolt, a U-shaped bolt, or the like. A wire, a hook, or the like is hung on the hanging tool 22b when the outside air heat exchanger 20 is transported.

The utilization piping system 3 is composed of a utilization device X, a forward pipe 31 connected to the utilization device, a pump P, a return pipe 32, and the like.

The utilization device X passes the heat medium fluid B pumped up by the forward pipe 31 and the pump P through the heat source side heat exchanger x1 for heat utilization, and returns the heat medium fluid B after the utilization to the return pipe 32 .
A suction port 31 a of the forward pipe 31 is positioned on the bottom side of the heat medium fluid B. As shown in FIG. The discharge port of the return pipe 32 is located above the liquid surface of the heat medium fluid B in the inner cylindrical portion 11 .
A utilization device X is a heat pump water heater equipped with a refrigeration cycle. Other examples of the equipment X that can be used include heat pump refrigeration and air conditioning equipment capable of switching between heating and cooling (including, for example, water-cooled heat pump cooling and heating equipment), cold chain equipment, snow melting machines, and the like.

Next, the characteristic functions and effects of the heat utilization device having the above configuration will be described in detail.
The heat medium fluid B in the heat medium fluid storage tank 1 is maintained at an appropriate temperature by heat exchange with groundwater, geothermal heat, and outside air. Then, the heat of the heat medium fluid B is circulated through the utilization piping system 3 and utilized by the utilization equipment X.

Specifically, in the heat medium fluid storage tank 1, groundwater infiltrates into the groundwater storage chamber 1B through a plurality of water passages 12a. According to the example shown in FIG. 1, this groundwater has a liquid level slightly above the boundary between the aquifer and the impermeable layer.
This groundwater flows into the groundwater storage chamber 1B or flows out of the outer tubular portion 12 according to changes in temperature, hydraulic pressure, and the like.
The heat of the groundwater is transferred to the heat medium fluid B through the tube wall of the inner tubular portion 11 . Since the inside of the inner cylinder portion 11 and the groundwater storage chamber 1B are separated by the pipe wall of the inner cylinder portion 11, the heat medium fluid B does not enter the groundwater storage chamber 1B.

On the other hand, the heat collection piping system 2 pumps up the heat medium fluid B from the heat medium fluid storage tank 1, distributes it to the underground heat exchanger 25 and the outside air heat exchanger 20, and then to the heat medium fluid storage tank 1. return. In this circulation process, the heat of the heat medium fluid B is heat-exchanged with geothermal heat by the underground heat exchanger 25 and further heat-exchanged with outside air heat by the outside air heat exchanger 20 .

Therefore, the heat medium fluid B in the heat medium fluid storage tank 1 can be maintained at an appropriate temperature by heat exchange between the ground water and the heat collection piping system 2 .

In addition, the heat collection piping system 2 includes a flow rate adjustment unit (specifically, a flow rate regulating valves, flow rate regulating piping circuits, etc.) are provided.

In the utilization piping system 3, after the heat of the heat medium fluid B pumped up from the heat medium fluid storage tank 1 is utilized by the utilization equipment X via a heat exchanger or the like (not shown), the heat medium fluid B is Return to heat carrier fluid storage tank 1 .

Therefore, according to the heat utilization apparatus having the above configuration, the heat collection capacity can be effectively improved by the heat collection piping system 2 having a relatively small installation area.

A specific utilization mode of the heat utilization device will be described below.
For example, the device X used is a heat pump water heater, and this heat pump water heater is used in the summertime, the ground water temperature T1 = 13 to 15 ° C., the outside temperature T2 = 30 to 35 ° C., the surface layer around the underground heat exchanger 25 Use under medium temperature conditions of 40-60°C.
The heat medium fluid B in the heat medium fluid storage tank 1 is stably retained to some extent by heat exchange with the groundwater in the groundwater storage chamber 1B.
When this heat medium fluid B is sucked into the utilization equipment X and passes through the heat source side heat exchanger x1, it is heat-exchanged with the low-temperature gas in the refrigeration cycle of the utilization equipment X and cooled to form a heat medium fluid storage tank. Returned to 1.
On the other hand, when this heat medium fluid B is sucked into the heat collection piping system 2 and passes through the underground heat exchanger 25 and the outside air heat exchanger 20, it exchanges heat with the relatively high temperature surface layer underground and outside air. , heated and returned to the heat medium fluid storage tank 1 .
Therefore, due to these heat exchange actions, the heat medium fluid B in the heat medium fluid storage tank 1 can be maintained at an appropriate temperature, and the performance of the utilization equipment X can be stabilized.

<Modification>

According to the above-described embodiment, as the pipes (straight pipe portion 21a and hairpin pipe portion 21b) constituting the heat exchange portion 21, normal tubular bodies having no irregularities on the inner and outer wall surfaces were used. As other examples, it is also possible to use a mode using an inner grooved tube or an outer grooved tube, a mode using a plate fin coil, or a mode using other heat exchangers.

Furthermore, as another example, the heat exchange section 21 can be replaced with a heat exchange section 23 shown in FIG.
The heat exchanging portion 23 is formed by forming a forward pipe 23a and a return pipe 23b, which are arranged substantially parallel to each other, in a substantially twisted winding shape and fixed to the frame body 22a.
More specifically, an inlet 23a1 and an outlet 23b1 are superimposed on one end sides of the forward pipe 23a and the return pipe 23b. The other end sides of the forward pipe 23a and the return pipe 23b are overlapped and bent in a substantially twisted coil shape (in other words, a spiral shape) toward the center of the frame 22a. connected in a continuous manner.
The inlet 23a1 is connected to the downstream side (outlet side) of the underground heat exchanger 25, and the outlet 23b1 is connected to the upstream side of the return pipe 2c.
The outer peripheral surfaces of the overlaid forward pipe 23a and return pipe 23b are exposed to the outside air.
According to the heat exchange section 23 having the above configuration, the same effects as those of the heat exchange section 21 described above can be obtained, and in addition, the heat exchange performance can be further improved by the unique tread-shaped piping.

Further, as a configuration added to the above embodiment, a fan for blowing air to the heat exchange section 21 may be provided in the vicinity of the heat exchange section 21 to further improve the heat collection performance.

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: Heat medium fluid storage tank 2: Heat collection piping system 3: Utilization piping system 11: Inner cylinder part 12: Outer cylinder part 12a: Water passage 14: Heat insulating material 20: Outside air heat exchanger 20a: Underground pipe part 20b : Exposed pipe section 21, 23: Heat exchange section 25: Underground heat exchanger B: Heat medium fluid X: Utilization equipment

Claims (3)

a heat medium fluid storage tank that stores a heat medium fluid that is brine; and heat of the heat medium fluid that is brine sucked from the heat medium fluid storage tank is heat-exchanged with external heat to heat the heat medium fluid storage tank. and a heat collection piping system connected so as to return to the heat medium fluid storage tank, and the heat medium fluid, which is brine sucked from the heat medium fluid storage tank, is passed through utilization equipment and is connected so as to return to the heat medium fluid storage tank. Equipped with a utilization piping system,
The heat collection piping system is for flowing the heat medium fluid that is brine, and is connected to an underground heat exchanger that is buried in the ground and an outside air heat exchanger that is exposed to the outside air. returning heat transfer fluid to the heat transfer fluid reservoir;
The heat medium fluid storage tank is configured in a double tubular shape including an outer tubular portion embedded in the ground and an inner tubular portion embedded in the outer tubular portion,
A water passage penetrating inside and outside is provided in the peripheral wall of the outer tubular portion, and a groundwater storage chamber for storing groundwater flowing through the water passage is provided between the inner tubular portion and the outer tubular portion. is provided, and the inner cylindrical portion has an inner space as a heat medium fluid storage chamber for storing the heat medium fluid, and the heat medium fluid storage chamber and the groundwater storage chamber are watertightly separated from each other. cage,
A heat insulating material is provided on an upper end side between the inner cylindrical portion and the outer cylindrical portion, and the groundwater storage chamber and the water passage are provided below the heat insulating material. heat utilization equipment.
The outside air heat exchanger has an underground tube section embedded in the ground and an exposed tube section that is connected to the underground tube section in a communication manner and is exposed to the outside air. 2. The heat utilization device according to claim 1, wherein a certain heat medium fluid is circulated.
3. The heat utilization device according to claim 2, wherein said exposed tube portion is formed in a tubular shape that stands up vertically.

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