JP2021134964A - Geothermal unit - Google Patents

Abstract

To obtain stable heat quantity.SOLUTION: A geothermal unit includes: a heat source-side piping system 10 forming a circulation flow channel of a heat medium liquid between an underground side and a ground side; a utilization-side piping system 30 forming a circulation flow channel of a liquid for utilizing heat at the ground side independently from the heat source-side piping system 10; a first heat exchanger 20 exchanging heat between the heat medium liquid flowing in the heat source-side piping system 10 and the liquid flowing in the utilization-side piping system 30; an auxiliary piping system 40 branched from the utilization-side piping system 30 at a downstream side with respect to the first heat exchanger 20, and joined to the utilization-side piping system 30 at a downstream side with respect to a branch point; and a second heat exchanger 50 exchanging heat between the liquid flowing in the auxiliary piping system 40 and the air outside of the auxiliary piping system 40 in a passage of the auxiliary piping system 40.SELECTED DRAWING: Figure 1

Description

The present invention relates to a geothermal heat utilization device in which geothermal heat is used as a heat source (including a heat source and a cold heat source) of a heat utilization device such as a snow melting device, an air conditioner, a refrigerator, and a water heater. ..

Conventionally, in this type of invention, for example, as described in Patent Document 1, a vertical casing, an outward pipe extending from the inside of the casing to the outside of the upper casing, and an outbound pipe extending from the outside of the casing to the inside of the casing are entered. With a return pipe extending downward, the ground water in the casing is pumped up by the outbound pipe and used by heat utilization equipment on the ground, and then the used water is returned to the inside of the casing by the return pipe and further to the groundwater vein. There is a groundwater return device that is designed to be returned.

Japanese Unexamined Patent Publication No. 2006-9335

By the way, according to the above-mentioned prior art, the performance of the above-mentioned heat utilization equipment may not be sufficiently exhibited due to temperature fluctuations due to changes in climate and seasons.

In view of such problems, the present invention has the following configurations.
A heat source side piping system that forms a heat medium liquid circulation flow path between the underground side and the ground side, and a liquid circulation flow path for heat utilization on the ground side are formed independently of the heat source side piping system. The first heat exchanger that exchanges heat between the utilization-side piping system, the heat medium liquid flowing through the heat source-side piping system, and the liquid flowing through the utilization-side piping system, and downstream from the first heat exchanger. An auxiliary piping system that is branched from the utilization side piping system on the side and joins the utilization side piping system on the downstream side of the branch point, and a liquid flowing through the auxiliary piping system in the path of the auxiliary piping system and the said An underground heat utilization device including a second heat exchanger that exchanges heat with the air outside the auxiliary piping system.

Since the present invention is configured as described above, the performance of the heat utilization device can be fully exhibited.

It is a structural drawing which shows typically an example of the geothermal heat utilization apparatus which concerns on this invention. It is a structural drawing which shows typically another example of the geothermal heat utilization apparatus which concerns on this invention.

In this embodiment, the following features are disclosed.
The first feature is the heat source side piping system that forms a circulation flow path for the heat medium liquid between the underground side and the ground side, and the liquid for heat utilization on the ground side independently of the heat source side piping system. The first heat exchanger that exchanges heat between the utilization-side piping system that forms the circulation flow path of the above, the heat medium liquid that flows through the heat source-side piping system, and the liquid that flows through the utilization-side piping system, and the first An auxiliary piping system that branches from the utilization-side piping system on the downstream side of the heat exchanger and joins the utilization-side piping system on the downstream side of the branch point, and the auxiliary piping in the path of the auxiliary piping system. It is provided with a second heat exchanger that exchanges heat between the liquid flowing through the system and the air outside the auxiliary piping system (see FIGS. 1 and 2).

The second feature is provided with a flow rate adjusting means for adjusting the ratio of the flow rate of the liquid flowing through the utilization side piping system to the flow rate of the liquid flowing through the auxiliary piping system (see FIGS. 1 and 2).

The third feature is that a blower for forcibly blowing air to the second heat exchanger is provided (see FIGS. 1 and 2).

The fourth feature is that a duct for flowing air from one end side to the other end side is provided, the blower is arranged on the upstream side of the air flow path in the duct, and the second is on the downstream side of the air flow path. The heat exchanger of No. 1 was arranged (see FIGS. 1 and 2).

As a fifth feature, the blower includes an impeller that rotates and blows wind onto the second heat exchanger, and a water turbine that mechanically transmits a rotational force to the impeller. It is provided in the liquid flow path on the downstream side of the second heat exchanger (see FIG. 2).

As a sixth feature, a water turbine chamber for accommodating the water turbine is provided on the downstream side of the second heat exchanger, and a discharge port for discharging the liquid in the second heat exchanger is provided in the water turbine chamber. , The water turbine was rotated by the liquid discharged from the discharge port and dropped (see FIG. 2).

The seventh feature is that the heat source side piping system, the utilization side piping system, and the auxiliary piping system rotate in the flow path of any of the piping systems due to the pressure of the liquid in the flow path. As described above, the water turbine is provided so that the rotational force of the rotating shaft of the water turbine is mechanically transmitted to the rotating shaft of the blower to rotate the blower (see FIG. 2).

<First embodiment>
Next, a specific embodiment having the above characteristics will be described in detail with reference to the drawings.
FIG. 1 shows an example of a geothermal heat utilization device according to the present invention.
The underground heat utilization device 1 includes a heat source side piping system 10 that forms a circulation path for the heat medium liquid between the ground and the ground, and a liquid flowing through the heat source side piping system 10 on the ground and the utilization side piping system 30. Circulation for heat utilization on the ground independently of the heat source side piping system 10 on the secondary side of the first heat exchanger 20 and the first heat exchanger 20 that exchange heat with the liquid flowing through the Auxiliary pipes that form a path and branch from the user-side duct system 30 on the downstream side of the first heat exchanger 20 and join the user-side pipe system 30 on the downstream side of the branch point. A second heat exchanger 50 that exchanges heat between the system 40 and the liquid flowing through the auxiliary piping system 40 in the flow path of the auxiliary piping system 40 and the air outside the auxiliary piping system 40, and a second heat exchange. It includes a blower 60 that forcibly blows air onto the vessel 50, and a tubular duct 70 that contains a second heat exchanger 50 and a blower 60 and allows air to flow from one end side to the other end side.

The heat source side piping system 10 is composed of piping and other equipment extending between the ground and the ground, sucks the heat medium liquid from the outgoing pipe 11 by a pump (not shown), and uses this heat medium liquid as the first heat exchanger. It is passed through the primary side flow path 21 of 20 and returned to the return pipe 12.

The heat medium solution may be groundwater, an antifreeze solution (brine solution) whose heat has been exchanged with the groundwater, or the like.
The outward pipe 11 and the return pipe 12 are connected to, for example, a device (not shown) that pumps up and circulates the heat medium liquid, a device (not shown) that exchanges heat with groundwater to circulate the antifreeze liquid, and the like.

The first heat exchanger 20 is a device that exchanges heat between the heat medium liquid flowing through the primary side flow path 21 and the liquid flowing through the secondary side flow path 22 independent of the primary side flow path 21. For the first heat exchanger 20, for example, a plate type heat exchanger, a shell & tube type heat exchanger, a double tube type heat exchanger, or the like can be used.

The utilization side piping system 30 is a circulation piping path for circulating a liquid in order to utilize the heat obtained by the first heat exchanger 20, and the secondary side of the first heat exchanger 20 is in the piping path. The flow path 22 is included.

More specifically, in the utilization side piping system 30, the suction port of the heat utilization device 31 is connected to the outlet of the piping 30a on the immediate downstream side of the first heat exchanger 20 and immediately after the heat utilization device 31. A three-way valve 32 is connected to the downstream pipe 30b, a merging pipe 33 is connected to the pipe 30c further downstream of the three-way valve 32, and the downstream pipe 30d of the merging pipe 33 is electric. It is connected to the inlet of the secondary side flow path 22 of the first heat exchanger 20 via the circulation pump P of the above.

The heat utilization device 31 indirectly or directly utilizes the heat of the liquid in the utilization side piping system 30, such as a snow melting device, an air conditioner (including a water-cooled heat pump chiller, etc.), a refrigerator, a heat pump type water heater, and the like. It may be a device.

The liquid flowing through the utilization side piping system 30 may be water such as tap water, but as another example, antifreeze liquid (brine liquid) or other liquid can also be used.

The three-way valve 32 is configured in a three-pronged shape having a pipe connection port in three directions, and according to a preferred example of the present embodiment, the electric three-way valve 32 is appropriately controlled by a signal from a control circuit (not shown). Is used.
In this electric three-way valve, the piping 30b on the downstream side of the heat utilization device 31 is branched into two, a piping 30c constituting the utilization side piping system 30 and a piping 40a constituting the auxiliary piping system 40. Further, this electric three-way valve functions as a flow rate adjusting means for adjusting the ratio of the flow rate of the liquid flowing to the auxiliary piping system 40 side and the flow rate of the liquid flowing to the utilization side piping system 30 side.

Further, the merging pipe 33 is configured in a three-pronged shape having pipe connection ports in three directions, and the liquid flowing from the pipe 30c of the utilization side pipe system 30 and the pipe 40b of the auxiliary pipe system 40 are merged to form the pipe 30d. Flush to.

The auxiliary piping system 40 is connected to one of the pipes 40a branched by the three-way valve 32, the second heat exchanger 50 connected to the downstream side of the pipe 40a, and the outlet of the second heat exchanger 50. It is provided with a pipe 40b.

The second heat exchanger 50 is a device that exchanges heat between the liquid flowing in the pipe and the air outside the pipe. As an example of the second heat exchanger 50, a large number of heat exchange fins (not shown) arranged substantially in parallel with appropriate gaps and a liquid inserted through these heat exchange fins in a serpentine manner. A plate fin coil heat exchanger equipped with a tube is used. The air sent by the blower 60 is passed through the large number of heat exchange fins.

The liquid flowing through the liquid pipe of the second heat exchanger 50 is returned to the utilization side piping system 30 via the pipe 40b and the merging pipe 33.

The blower 60 is provided on the upstream side (suction side) of the second heat exchanger 50 in the air flow path in the duct 70, and is provided on the heat exchange fin (not shown) of the second heat exchanger 50. On the other hand, air is forcibly blown and distributed.

The blower 60 of the illustrated example includes an impeller 61 that sucks air from one of the axial directions and discharges the air outward in the radial direction, and a rotary drive source 62 that drives and rotates the rotating shaft of the impeller 61. (Including sirocco fans).

The impeller 61 is configured to support a large number of blades spaced in the circumferential direction by a rotation shaft on the center side thereof, and is arranged in the duct 70.

The rotary drive source 62 is a rotary electric motor according to the illustrated example. The rotary drive source 62 is supported outside the duct 70 so that the rotary drive shaft connected to the rotary shaft of the impeller 61 penetrates the wall portion of the duct 70.

As another example of the blower 60, it is also possible to use a blower of a type other than the illustrated example, such as a propeller fan or a turbo fan.

The duct 70 is a tubular member that discharges the air sucked from the suction port 71 on one end side from the discharge port 72 on the other end side.
According to the illustrated example, the duct 70 is bent in a substantially U-shape from the space A on one side partitioned by the wall W to the space B on the other side (for example, indoors).

The suction port 71 is arranged in the space A on one side and sucks the air in the space A. According to the illustrated example, the suction port 71 opens in a direction intersecting the air flow direction in the duct 70, but as another example, when the blower 60 is a propeller fan, the air flow direction Open the upstream end of.

The discharge port 72 is arranged in the space B on the other side with respect to the one side, and discharges air into the space B.

The duct 70 having the above configuration has the pipes 40a and 40b of the auxiliary piping system 40 penetrating the wall surface thereof. Then, in the duct 70, a second heat exchanger 50 is connected between these two pipes 40a and 40b.
Further, in the air flow path in the duct 70, an impeller 61 of the blower 60 is provided on the upstream side of the second heat exchanger 50 (see FIG. 1).

<Effect>
Next, the characteristic action and effect of the geothermal heat utilization device 1 having the above configuration will be described in detail.
For example, if the geothermal heat utilization device 1 is used when the outside temperature is relatively high in summer, the underground heat medium liquid having a relatively low temperature and the liquid in the utilization side piping system 30 exchange heat with each other to exchange heat with the utilization side. The liquid in the piping system 30 can be cooled. Then, the heat utilization device 31 can be operated by using this cooled liquid as a cold heat source.

If the liquid is circulated to the auxiliary piping system 40 by the three-way valve 32 and the merging pipe 33 during the operation of the heat utilization device 31, the amount of heat of the liquid in the utilization side piping system 30 is transferred by the liquid on the second heat exchanger 50 side. By adjusting, it becomes possible to fully exert the performance of the heat utilization device 31.
In particular, according to a preferred example of the present embodiment, since the three-way valve 32 can be electrically controlled, the amount of heat can be finely adjusted to stabilize the performance of the heat utilization device 31.

Further, according to the geothermal heat utilization device 1, the liquid branched from the utilization side piping system 30 and flowing to the auxiliary piping system 40 exchanges heat with the air in the duct 70 via the second heat exchanger 50.
Therefore, the air in the space A can be temperature-controlled by the second heat exchanger 50 and supplied to the other space B.
For example, if the geothermal heat utilization device 1 is used when the outside air temperature is relatively low in winter, the relatively high temperature heat medium liquid and the liquid of the utilization side piping system 30 exchange heat with each other to exchange heat with the utilization side piping system 30. The liquid can be heated. Then, using this heated liquid as a heat source, the heat utilization device 31 (for example, a heat pump type water heater) can be efficiently operated, and the heated liquid is further distributed to the second heat exchanger 50. The air flowing through the duct 70 can be made into appropriately heated air and supplied to another space B.

Further, if the geothermal heat utilization device 1 is used when the outside temperature is relatively high in summer, the relatively low temperature heat medium liquid (liquid on the heat source side piping system 10 side) and the liquid on the utilization side piping system 30 are heated. It can be replaced to cool the liquid in the utilization side piping system 30. Then, using this cooled liquid as a cold heat source, the heat utilization device 31 (for example, a heat pump type chiller) can be efficiently operated, and the cooled liquid is further distributed to the second heat exchanger 50. The air flowing through the duct 70 can be made into appropriately cooled and dehumidified air and supplied to another space B.

<Second embodiment>
Next, another example of the geothermal heat utilization device according to the present invention will be described.
Since the geothermal heat utilization device shown below is a partial modification of the above-mentioned geothermal heat utilization device 1, the same reference numerals are given to the configuration substantially similar to that of the geothermal heat utilization device 1. Will be used, and duplicate detailed explanations will be omitted.

The geothermal heat utilization device 2 shown in FIG. 2 replaces the blower 60 with the blower 60X with respect to the geothermal heat utilization device 1, and accommodates the water turbine 62X on the downstream side of the second heat exchanger 50. 90 is provided.

The blower 60X is a blower 60 in which the rotary drive source 62, which is an electric motor, is replaced with a water turbine 62X.

The turbine 62X is embedded in the turbine chamber 90, which is in the flow path of the liquid on the downstream side of the second heat exchanger 50.
The water turbine 62X supports a plurality of water receiving plates 62X2 at intervals in the circumferential direction on the outer periphery of the drive rotating shaft 62X1 connected to the rotating shaft of the impeller 61, and the water receiving plates 62X2 receive the liquid. When it rotates, the rotational force is mechanically transmitted to the impeller 61 by the drive rotation shaft 62X1.

The drive rotating shaft 62X1 projects into the water turbine chamber 90 so as to penetrate the outer wall of the duct 70, and is rotatably supported by a bearing member (not shown).

The plurality of water receiving plates 62X2 receive the liquid (water) discharged from the discharge port 40c and fall at a position horizontally separated from the rotation axis.

The water turbine chamber 90 is a closed room located outside the duct 70. In the turbine chamber 90, a turbine 62X having the above configuration, a discharge port 40c, a liquid receiving unit 91, a discharge port 92, and the like are provided.

The discharge port 40c is formed so that a pipe on the downstream side of the second heat exchanger 50 is passed through the outer wall of the duct 70 and the tip thereof is opened in the water turbine chamber 90. The liquid discharged from the discharge port 40c freely falls and is received by the water receiving plate 62X2 of the water turbine 62X.

The liquid receiving portion 91 constitutes a concave storage tank having a bottom portion on the lower side of the water turbine 62X. The liquid receiving unit 91 temporarily stores the liquid received by the water receiving plate 62X2.

The discharge port 92 is provided on the wall portion on the bottom side of the liquid receiving portion 91. The discharge port 92 is connected to a pipe 40d outside the turbine chamber 90. Like the geothermal heat utilization device 1, the pipe 40d is connected so as to join the utilization side piping system 30 via the confluence pipe 33. Therefore, the liquid discharged from the liquid receiving unit 91 is returned to the utilization side piping system 30 via the pipe 40d and the merging pipe 33.

According to the geothermal heat utilization device 2 having the above configuration, if a liquid (water) is circulated in the auxiliary piping system 40, the liquid falls from the discharge port 40c and is received by the water receiving plate 62X2, and the water turbine 62X and the impeller 61 rotates to forcibly convey the air in the duct 70.
Therefore, heat exchange by the second heat exchanger 50 can be performed with low power consumption and high efficiency.

<About cold and hot water supply channels>
The geothermal heat utilization devices 1 and 2 having the above configuration are provided with a cold / hot water supply path 80, if necessary.
The cold / hot water supply path 80 is configured to supply the liquid heated or cooled by the heat utilization device 31 to the upstream side of the second heat exchanger 50 in the auxiliary piping system 40.
More specifically, the cold / hot water supply path 80 joins the pipe 81 through which the liquid (for example, water) heated or cooled by the heat utilization device 31 flows and the liquid flowing through the pipe 81 into the auxiliary piping system 40. It is provided with a merging pipe 82.

The upstream side of the pipe 81 is connected to the hot water supply pipe of the heat utilization device 31 via a three-way valve or the like (not shown), and the downstream side is connected to the combined pipe 82. Then, the pipe 81 takes in a part of the heated or cooled liquid from the heat utilization device 31.

Further, as a preferable example, an electric three-way valve is used for the combined pipe 82. This electric three-way valve is controlled by a control circuit (not shown) to appropriately adjust the flow rate of the liquid supplied from the pipe 81 on the heat utilization device 31 side.

Therefore, according to the embodiment in which the cold / hot water supply path 80 is added to the geothermal heat utilization device 1 (or 2), the amount of heat of the liquid flowing through the auxiliary piping system 40 is adjusted by the temperature of the liquid merging from the cold / hot water supply path 80. can do.
For example, if the heat utilization device 31 is used as a water heater and the cold / hot water supply path 80 is provided, the heat utilization device can be added to the auxiliary piping system 40 in winter when the air heating in the duct 70 by the second heat exchanger 50 is insufficient. The hot water of 31 (water heater) can be added to raise the temperature of the liquid flowing through the auxiliary piping system 40, and the air heating performance (heating capacity) of the second heat exchanger 50 can be improved.

<Dry mist supply route>
The geothermal heat utilization devices 1 and 2 having the above configuration are provided with a dry mist supply path 100 for injecting water into the duct 70 in the form of mist, if necessary.
The dry mist supply path 100 includes a pipe 101 branched from the pipe 81 and heading into the duct 70, a flow rate adjusting valve 102 that adjusts the flow rate of water in the pipe in the middle of the pipe 101, and a downstream end of the pipe 101. A nozzle 103 that is connected to the duct 70 and sprays water into the duct 70, and a control unit 104 that adjusts the opening degree of the flow rate adjusting valve 102 according to the humidity of the space B are provided.

The nozzle 103 is a nozzle for dry mist having an opening having a small diameter, and is connected to each of the branched pipes on the downstream side of the pipe 81.

The control unit 104 is a device that turns contacts on and off so that the humidity sensed by the sensor approaches an arbitrarily set humidity, and is sometimes called a humidist or the like.
The control unit 104 is electrically wired so as to adjust (for example, open or close) the opening degree of the flow rate adjusting valve 102.

According to the embodiment in which the dry mist supply path 100 is added, for example, the heat utilization device 31 is used as a water heater, and in winter, the hot water heated by the heat utilization device 31 is guided into the duct 70 by the pipe 81 and fog from the nozzle 103. By injecting the air in the same manner, it is possible to impart an appropriate amount of moisture to the air flowing through the duct 70 and maintain the space B at an appropriate humidity.

<Other variants>
According to the geothermal heat utilization device 2 of the above embodiment, the water turbine 62X is provided in the auxiliary piping system 40, but as another example, a water turbine is provided in the heat source side piping system 10 or the utilization side piping system 30. It is also possible to mechanically transmit the rotational force to the impeller 61 in the duct 70.

Further, according to the above embodiment, the rotational force of the rotary drive source 62 (or the water wheel 62X) is directly transmitted to the impeller 61 by connecting the rotary shafts, but as another example, the rotary drive source 62 It is also possible to transmit the rotational force of (or the water wheel 62X) to the impeller 61 via a gear or a flexible shaft.

Further, according to the above embodiment, a single heat utilization device 31 is provided in the utilization side piping system 30, but as another example, a plurality of heat utilization devices 31 are provided in the utilization side piping system 30. Things are possible.

Further, according to the above embodiment, a three-way valve 32 having a flow rate adjusting function is provided at a branch point from the user-side piping system 30 to the auxiliary piping system 40, but as another example, the three-way valve 32 has a flow rate adjusting function. It is also possible to use a branch pipe that does not have the above, a mode in which a flow rate adjusting valve is provided in the pipe 40a, and the like.

Further, according to the above embodiment, the discharge port 72 of the duct 70 is arranged indoors, but as another example, the discharge port 72 of the duct 70 is arranged outdoors to blow cold air or hot air to the outside. Is also possible.

Further, the present invention is not limited to the above-described embodiment, and can be appropriately changed without changing the gist of the present invention.

1, 2, Geothermal heat utilization device 10: Heat source side piping system 20: First heat exchanger 30: Utilization side piping system 31: Heat utilization equipment 32: Three-way valve (flow rate adjusting means)
40: Auxiliary piping system 40c: Discharge port 50: Second heat exchanger 60: Blower 61: Impeller 62: Rotating drive source 62X: Water wheel 70: Duct 80: Cold / hot water supply path 90: Water wheel room

Claims (7)

A heat source side piping system that forms a circulation flow path for the heat medium liquid between the underground side and the ground side,
A utilization-side piping system that forms a liquid circulation flow path for heat utilization on the ground side independently of the heat source-side piping system.
A first heat exchanger that exchanges heat between the heat medium liquid flowing through the heat source side piping system and the liquid flowing through the utilization side piping system.
An auxiliary piping system that branches from the utilization side piping system on the downstream side of the first heat exchanger and joins the utilization side piping system on the downstream side of the branch point.
Geothermal utilization characterized by comprising a second heat exchanger that exchanges heat between the liquid flowing through the auxiliary piping system and the air outside the auxiliary piping system in the path of the auxiliary piping system. Device. The geothermal heat utilization device according to claim 1, further comprising a flow rate adjusting means for adjusting the ratio of the flow rate of the liquid flowing through the utilization side piping system to the flow rate of the liquid flowing through the auxiliary piping system. The underground heat utilization device according to claim 1 or 2, wherein the second heat exchanger is provided with a blower forcibly blowing air. A duct for circulating air from one end side to the other end side is provided, the blower is arranged on the upstream side of the air flow path in this duct, and the second heat exchanger is arranged on the downstream side of the air flow path. The geothermal heat utilization device according to claim 3, wherein the device is provided. The blower includes an impeller that rotates and blows wind onto the second heat exchanger, and a water turbine that mechanically transmits a rotational force to the impeller.
The geothermal heat utilization device according to claim 3 or 4, wherein the water turbine is provided in a liquid distribution path on the downstream side of the second heat exchanger. A water turbine chamber for accommodating the water turbine is provided on the downstream side of the second heat exchanger, and a discharge port for discharging the liquid in the second heat exchanger is provided in the water turbine chamber, and the liquid is discharged from the discharge port. The geothermal heat utilization device according to claim 5, wherein the water turbine is rotated by a liquid that is dropped. A water wheel is provided in the flow path of any of the heat source side piping system, the utilization side piping system, and the auxiliary piping system so as to rotate by the pressure of the liquid in the flow path. The underground heat utilization device according to claim 3, wherein the rotational force of the rotating shaft of the water turbine is mechanically transmitted to the rotating shaft of the blower to rotate the blower.

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