JPS63108158A - Underground heat exchanger - Google Patents

Abstract

PURPOSE:To utilize a limitless amount of thermal source by a method wherein a first pipe having a natural thermal accumulation pipe and a metering pipe, a second pipe capable of performing an efficient radiation down to a deep layer with a slight pressure force with liquified gas being applied as liquid at its upper part are inserted into the underground hole to form a high efficient underground heat exchanger device. CONSTITUTION:Liquified gas is forcibly circulated under its decreased pressure within forced thermal accumulation pipes 1-4. Liquified gas in a going pipe 2 and a return pipe 3 is sucked out, and interior parts of the pipes are reduced in pressure, resulting in that the liquified gas within the going pipe 1 acting as a metering pipe takes a gasification heat within the going pipe 2 and evaporates. Then, it is overheated within the return pipe 3 of which pressure is lower and then goes out. Liquified gas in the natural thermal accumulation pipe 5 may take a gasification heat, discharge its condensation heat, show a natural circulation and carry heat from lower part to upper part. Liquified gas within a second pipe 9 to 11 flows with a steam of hot temperature and high pressure and into a pipe 10 having a heat exchanging feature, resulting in that heat of the thermal accumulative material around the pipe is collected by the first pipe and its temperature is kept low, so that its condensation heat is discharged to form liquified gas. Temperature of the condensed liquified gas is gradually decreased while being circulated within the heat exchanging pipe 10. The liquified gas of which temperature is than of the underground area passes insulatingly within the non-heat exchanging pipe 11 and flows out.

Description

[Detailed Description of the Invention] "Technical Field" The present invention makes full use of geothermal heat, the vast heat capacity and constant temperature of the earth, and the heat retention ability of the earth, making it possible to utilize deep underground easily and effectively. The present invention proposes an underground heat exchange device, and relates to an underground heat exchange device for, for example, hot water supply, heating, cooling, and refrigeration.

"Prior art and its problems" The temperature deep underground is almost unaffected by air temperature and is stable throughout the seasons, remaining constant at about 6 to 7 meters underground and gradually rising in shallower layers. . In deeper layers, it increases further due to geothermal heat from within. The surface temperature of the earth fluctuates with changes in air temperature, but there are places in the shallow layer several seven meters underground that, contrary to the temperature, are higher in winter than in summer.

This is because the earth conducts heat very slowly.
This is probably due to the vast heat capacity of the earth and the heat retention properties of the earth. In other words, when the surface layer of the earth is heated in the summer, it gradually warms up from the shallower layers in the winter, and the surface layer cools down in the winter. The shallow layers gradually cool down over the summer. Due to this time lag in heat conduction, it is higher in winter than in summer. Also, heat deep underground gathers no matter how much heat you take away. This is due to the constant temperature of the earth, and is due to the vast heat capacity h1 of the earth, which stores solar heat and geothermal heat, and the heat retention ability of the earth. There is groundwater underground, and the heat capacity M of the ground increases due to groundwater, and heat exchange takes place quickly.

However, even if we try to use the conventional technology deep underground, the frictional pressure loss due to the circulation of the heat exchange medium is large.
This requires excessive power, significantly reducing efficiency, making the pipes thicker, making the perforations larger, making the equipment larger, and requiring more extensive installation work. A geothermal heat exchange device that can reach deep underground and take advantage of this ability has not yet been realized.

"Objective of the Invention - 1 The present invention solves the conventional problems and provides a highly efficient and large-capacity underground heat exchange device that can be easily and effectively used deep underground. This aims to fully utilize the abundant dormant heat resources.

"Summary of the Invention" In order to achieve the first objective, the present invention does not target the four surface layers of the earth where the soil temperature fluctuates as the temperature changes;
Targets shallow to deep layers approximately 6 to 7 meters underground. Therefore, the depth that this device can reach ranges from several tens of meters underground to several thousand meters. As a method for effectively utilizing the deep underground, the present invention separates the heat collection cycle and the heat radiation cycle into separate systems, and the heat collection cycle includes a primary system that carries heat from the bottom to the top free of charge, no matter how deep A tube is installed. This is a heat collection tube that automatically operates based on temperature differences, allowing liquefied gas to circulate naturally, and requiring no running costs. Therefore, heat extraction by power only needs to be done from one part at all times, making it possible to place forced heat collection tubes in the ground, reducing frictional pressure loss inside the tubes, and efficiently exchanging a large amount of heat with thin tubes. Can be done. In addition, in the heat radiation cycle, a second pipe is provided together with the heat collection cycle, and the high-liter packed high-pressure steam can be cooled and liquefied at the upper part of the forced heat collection pipe, etc.
The specific weight increases in the upper part, which reduces the circulation speed and balances the weight of the liquid liquefied gas, making it possible to efficiently dissipate heat deep into the earth with a small pressure. Because it is reduced in size, a large amount of heat can be exchanged in a thin tube.

If the lubricating oil that fractionates and accumulates at the bottom of the tube due to depressurization does not circulate within the forced heat collection tube, it is possible to further shorten the forced heat collection tube and reduce pressure loss by using a liquid receiving natural heat collection tube. You can do it.

Another feature of the present invention is that the outgoing tube of the forced heat collection tube is a constricted tube, and the liquefied gas in the outgoing tube is circulated as a liquid to make the outgoing tube a thin tube. Further, a liquid retention heat transfer body is provided in the heat exchange portion of the first pipe to appropriately retain an appropriate amount of liquid liquefied gas so that heat radiation condensation and endothermic evaporation can be performed efficiently.

In particular, natural heat collection pipes serve not only as natural heat collection pipes, but also as liquid receivers, where they separate liquid and steam, prevent excess liquid from clogging the pipes, and prevent steam from clogging the pipes. In addition to ensuring smooth flow is not disturbed, the amount of liquefied gas circulating within the device is automatically adjusted to facilitate startup and high-speed operation of the device.

As described above, the present invention utilizes simple poling holes to reduce pressure loss in the pipeline, save power, and enable high-speed heat exchange with high efficiency, regardless of the depth. To provide an underground heat exchange device that can easily reach deep underground by making the pipes constituting the device thinner so that the device can easily withstand high pressure and be easily bent.

The present invention not only uses geothermal heat directly, but also uses solar heat, heat obtained from water or the atmosphere, or heat obtained from air conditioning or refrigeration to supply hot water or space heaters, and stores the excess heat underground. There is also underground heat exchange equipment for hot water supply and space heating. The heat used for hot water supply and space heating is dissipated into wastewater, the atmosphere, and returned underground. In this way, only heat is circulated and no material is consumed.

Traditionally, we have used heat to cool things down, and heat to beat the heat. On the other hand, fuel is consumed to boil water,
We have been consuming fuel to survive the cold. The fact that we are wasting heat in this way teaches us a new need. Here, the present invention takes advantage of the heat retention properties of the earth, uses the underground as a large heat storage body to adjust the excess or deficiency of heat, or directly utilizes geothermal heat to utilize the dormant inexhaustible heat resources. This paper proposes a geothermal heat exchange device that utilizes the ground heat exchange system.

“Embodiments of the invention” The invention will now be described with reference to the illustrated embodiments.

In the present invention, the "surface layer" refers to the range that fluctuates due to changes in ground temperature, the "shallow layer" refers to the range where heat can be collected using only power, and the "deep layer" refers to the area where heat can be collected through natural circulation of liquefied gas. This refers to the range in which heat can be collected while minimizing frictional pressure loss in the road.

1, 8, 9, 10, 14, and 15 each show an embodiment of the present invention, and the forced heat collection tube in FIG. 15 shows a longitudinal section. Figures 2 to 7 and 1
1 to 13 are cross-sectional views of the main parts thereof. In the figure, first pipes 1 to 8 and second pipes 9 to 11 are inserted into underground poling holes [3H, and liquefied gas circulates inside the pipes. The liquefied gases used are ammonia and fluorocarbons, which decompose in the air and do not react with ozone. A backfilling material 12 such as sand or gravel is filled around these pipes to facilitate the movement of groundwater, increase the exchange efficiency of this device, and prevent collapse of the borehole BH.
However, the buoyancy of groundwater prevents these pipes from floating up. These tubes do not necessarily have to be inserted into the same borehole, but only need to be positioned so that they can exchange heat with each other.

In Figures 1, 8, 9, 10, 14, and 15, forced heat collection tubes 1 to 4 are tubes that retain heat by power, and do not provide heat to the outside of the device. A heat exchange section communicates with the exchangeable outgoing pipe, and a non-heat exchange return pipe communicates with the outside of the device, forming a forced circulation pipe system including the compressor. There is. In the reciprocating pipes 1 to 1, the thicker and shorter the pipe in the reduced-pressure circulating section is, the more the frictional pressure loss can be reduced. Therefore, natural heat collecting pipes 5 to 7
If natural heat is collected as much as possible by the liquid receiving natural heat collection pipe 8, power can be saved.
This device can be made smaller.

If the outgoing pipe 1 in Fig. 1, Fig. 8, Fig. 9, Fig. 14, and Fig. 15, or the outgoing pipes 1 and 2 in Fig. 10 are used as throttle pipes,
Since the liquefied gas inside the pipe can be circulated as a liquid, the device can be further miniaturized.

If the liquefied gas circulating in the forced heat collection tubes 1 to 4 contains lubricating oil, and this lubricating oil is fractionated and retained at the bottom of the tube due to pressure reduction, Figs. As shown in Figure 15, the forced heat collection pipes 1 to 1 without the pipe 8 to natural soil collection.
Use 4. In this case, forced circulation performs heat exchange with the surrounding heat storage parts, the natural heat collection tube 5, and the second pipe 10, so forced heat collection tubes 1 to 4 of sufficient length are required. In the example shown in FIG. 10, FIG. 14, and the lower part of FIG.
~4 can be shortened.

In Figures 1, 8, 9, 10, 14 and 15, non-heat exchangeable tubes 1.4 ensure that there is no thermal influence on the outside of the device. This is an insulated pipe that uses cladding. Examples are shown in FIGS. 18 and 19. FIG. 18 is a cross-sectional view, and FIG. 19 is a vertical cross-sectional view.

The pipe 19 is made of a flexible pipe that is not eroded by liquefied gas, the heat insulating material 20 is made of multi-layer foamed polypropylene, etc., and the covering material 21 is made of a material that is not eroded by groundwater.

If the tubes that make up this device are flexible tubes that can be easily bent, the long tubes can be coiled and handled, making transportation and installation easier.

In Figures 1, 8, and 9, forced heat collection tubes 1 to
4, surface area increasing heat transfer bodies are provided on the outer surface of the outgoing pipe 2 and the outer surface and inner surface of the return pipe 3 in the heat exchange portion to increase the heat transfer area and improve the heat exchange efficiency. In particular, a liquid retention heat transfer body with an increased surface area is provided on the inner surface of the outgoing pipe 2, which is an evaporation pipe, so that the liquid liquefied gas of suitable Ii1 is appropriately retained, easily obtaining vaporization heat, and endothermic evaporation. This makes it easy to remove vapor and supply liquid liquefied gas continuously. Examples of such tubes are shown in FIGS. 20 and 21. FIG. 20 is a cross-sectional view of this tube, and FIG. 21 is an L-longitudinal cross-sectional view. The pipe 22 is made of a flexible material that is not eroded by liquefied gas or underground water and has high thermal conductivity.

This has a protrusion 23 on the outer surface with a large surface area, and a protrusion 24 on the inner surface not only has a large surface area, but also makes it easier for liquefied gas to flow when used in a straight pipe, and when used in a spiral pipe. , liquid tends to stagnate.

As shown in Figs. 1, 8, and 9, if the outgoing pipe 2 of the heat exchange part is a spiral pipe, the whole will have a constant gentle slope, which will not only make it easier for the liquid to accumulate, but also make it possible to maintain the same depth. Even with a small device, the heat transfer area can be increased. Furthermore, since the device can be easily bent, transportation and installation are simplified. Furthermore, this spiral tube 2 encloses the return tube 3, the natural heat collection tube 5, and the second tube 10, so that heat exchange with these tubes is effectively performed, and the filtrate and liquefied gas flowing through the return tube 3 can be easily filtered. Can overheat.

In FIG. 8, FIG. 10, FIG. 14, and the lower part of FIG.
This liquid receiving natural heat collection pipe 8 is connected to the surrounding heat storage part, the second pipe l
Since heat is collected from O and the natural heat collection pipe 5, the forced circulation pipe can be shortened and frictional pressure loss can be reduced. In addition, when forced circulation inside the reciprocating tubes 1 to 4, the liquid and steam are separated at the upper part of the liquid receiving natural heat collection tube 8, and the flow of the steam is performed smoothly, and the circulation amount of the liquefied gas is automatically adjusted. This makes it easy to start up and operate the device at high speed.

When forced circulation is not performed in reciprocating pipes 1 to 4, reciprocating pipes 1 to 4
The liquefied gas naturally circulates and collects heat in the synthetic heat collecting tube where the liquid receiving natural heat collecting tube 8 and 4 are combined, but when forced circulation is used, the pressure inside this synthetic heat collecting tube is reduced, so the temperature is lower. Heat is collected through forced circulation and natural circulation. That is,
When a liquefied gas with a liquid is depressurized, the liquid also becomes a vapor and reaches the temperature when the saturated vapor pressure of the liquefied gas is equal to the reduced pressure.

Examples of the liquid receiving natural heat collection tube 8 shown in Fig. 8 are shown in Figs. 23 and 24.
As shown in the figure. FIG. 23 is a cross-sectional view of M in FIG. 22 showing the lower part of the synthetic heat collection tube, and FIG. 24 is a cross-sectional view of N in FIG. 23. In Figures 23 and 24, the outlet 25 of the outgoing pipe 2 and the inlet 26 of the incoming pipe 3 of the forced heat collecting pipe are in communication with part J of the liquid receiving natural heat collecting pipe 8, and this Liquid natural heat collection tube 8
It has a heat transfer body 27 with increased surface area on its outer surface, and a liquid retention heat transfer body 28 with increased surface area on its inner surface. The liquid retention heat transfer body 28 at the bottom of the liquid receiving natural heat collection pipe 8 is for boiling, but the liquid retention heat transfer body 28 at the top is used for boiling as the liquefied gas is depressurized during forced circulation operation, and the operation is stopped. The liquefied gas naturally circulates in the l- and is used for condensation. The condensing type is designed to break the surface tension with the stagnant liquid liquefied gas so that the condensed liquefied gas does not stay there due to surface tension, and is continuously guided away. The vapor is retained and warms up easily, and the removal of vapor and the supply of liquid liquefied gas are performed continuously.

In FIG. 1O and FIG. 14, the outgoing pipe 1.2 is a pipe that exchanges heat with the inside of the apparatus, and is a throttle pipe. This may be a spiral tube or a straight tube. This outbound pipe 1.2
The liquid inside the pipe is cooled while heating the liquefied gas in the return pipe 3.4. The return pipe 3 and liquid receiving natural heat collecting pipe 8 of the heat exchange section are corrugated pipes, and have an increased surface area and serve as filter pipes for retaining the liquid. This is a flexible pipe with high thermal conductivity that is not attacked by liquefied gas or groundwater. The return pipe 3 serves as an evaporation pipe and a superheating pipe when the liquefied gas is being forcedly circulated, and serves as a condensing pipe when the liquefied gas is not being forcedly circulated. If there is no liquid receiving natural heat collecting pipe 8, an independent natural heat collecting pipe 5 is required.

In FIG. 15, the outgoing pipe 2 of the heat exchange part, the return pipe 3 of the heat exchange part, and the liquid receiving natural heat collection pipe 8 exchange heat with the inside of the apparatus, but do not exchange heat with the outside of the apparatus. but,
When the outgoing pipe 2, the returning pipe 3, and the liquid receiving natural heat collection pipe 8 are surrounded by a heat storage part, heat is also exchanged with the outside of the device.

The liquefied gas is circulated under forced pressure inside the reciprocating pipe 2.3 in Fig. 15, but the liquefied gas flowing tangentially to the circumference of the outgoing pipe 2 from the outgoing pipe 1, which is a throttle pipe, flows into the heat exchange section. After rotating, the water passes through the return pipe 3 and flows out from the return pipe 4. Due to the centrifugal force of this rotation, the liquid liquefied gas rotates along the pipe wall of the reciprocating pipe 2.3, which is a corrugated pipe. At this time, the corrugated tube 2.
The narrowed portion of 3 becomes a liquid dispersion protrusion 15, and the liquid liquefied gas is sprayed into the natural heat collection pipe 5 at the center. Moreover, due to this centrifugal force, the pressure on the outside of the rotating liquefied gas becomes high and the pressure on the inside becomes low, promoting the evaporation of the liquid liquefied gas dispersed in the natural heat collection tube 5 at the center.

The cycle of the liquefied gas in the forced heat collection tubes 1 to 4 will be explained with reference to FIGS. 1, 9, and the upper part of FIG. 15. The liquefied gas is forced to circulate through the forced heat collection tubes 1 to 4 under reduced pressure. When the liquefied gas in the outgoing pipe 2 and the returning pipe 3 is sucked and the pressure inside the pipe is reduced, the liquefied gas in the outgoing pipe 1, which is a throttle pipe, is transferred to the outgoing pipe 2.
The liquefied gas absorbs the heat of vaporization and evaporates, and is superheated in the return pipe 3 where the pressure is lower. At first, the liquefied gas becomes wet steam, which is a mixture of liquid and steam, but when it is overheated on the way, It becomes dry steam and then superheated steam. Here, the circulation speed in the pipe should be set to 4 m/sec or more for horizontal pipes and 8 m/sec for vertical pipes.
m/sec or more, the lubricating oil can be circulated together with the liquefied gas.

In FIG. 8, FIG. 1O, FIG. 14, and the lower part of FIG. 15, the cycle of the liquefied gas in the synthetic heat collecting tubes 1 to 4.8 will be explained. The liquefied gas is circulated under reduced pressure and naturally within the synthetic heat collecting tubes 1 to 11.8. When this device is operated, it performs depressurized circulation and natural circulation, and when it is stopped, only natural circulation occurs. In the depressurized circulation, when the liquefied gas is sucked and the pressure inside the tube is reduced, the liquefied gas in the liquid receiving natural heat collection tube 8 and the liquid liquefied gas freely falling from the throttle tube take away the heat of vaporization and evaporate, resulting in superheating. It comes out as steam. At this time, the excess liquid liquefied gas accumulates at the lower part of the liquid receiving natural heat collection tube 8. In natural circulation, when the temperature of the upper part of the synthetic heat collection rf1 to 4.8 becomes lower than the lower part, it continues to circulate naturally and collect heat for free. That is, the liquid liquefied gas is stored in the lower part of the liquid receiving natural heat collection tube 8, and the other portions of the synthetic heat collection tubes 1 to 4.8 are filled with saturated vapor of the liquefied gas. If a temperature difference occurs in the range where the liquefied gas is a liquid, natural circulation occurs due to convection, but if a temperature difference occurs in the range where the liquefied gas is a saturated vapor, the lower temperature part of the two parts will become saturated. The vapor condenses, releases the heat of condensation, and becomes a liquid liquefied gas. While falling freely, if there is a high temperature part on the way down, it is warmed there, absorbs the heat of vaporization, and evaporates to the saturated vapor pressure of that temperature. . In this way, L from the bottom through natural circulation.
Bring heat to the area.

In Figures 1, 8, 9, and 15, the natural heat collection tubes 5 to 7 are heat exchangeable tubes in at least 6 lower portions, are closed tubes as a whole, and have liquefaction inside the tubes. A tube filled with gas, which may be a single tube or multiple tubes. Natural heat collection tube 5~
7, when the temperature of the second part becomes lower than the temperature of the lower part, the liquefied gas sealed in the tube naturally circulates and carries heat from the lower part to the upper part. As shown in FIG. 8, FIG. 9, and FIG. 15, by using a non-heat exchanging tube 6 in the middle of the natural heat collecting tubes 5 to 7, heat radiation in the middle can be prevented. In particular, if a non-heat exchangeable enclosing tube 7 as shown in FIG. 8 is provided,
After installing the natural heat collecting pipes 5 to 7, it is possible to fill in an appropriate liquefied gas depending on the underground temperature, and also to fill in the appropriate liquefied gas depending on the temperature difference between the upper and lower sides of the natural heat collecting pipes 5 to 7 and the type of liquefied gas. The discharge of the sealed liquefied gas can be adjusted to reach the maximum capacity.

Regarding the heat exchange parts of natural heat collecting pipes 5 to 7, Fig. 1 and Fig. 8
In the case of Fig. 9 and Fig. 9, the heat transfer tube has a surface area increasing heat transfer body on its outer surface, a liquid staying heat transfer body for boiling on the inner surface at the lower part, and a liquid staying heat transfer body for condensing on the upper part. In the case of Fig. 15, a liquid retention heat transfer element for boiling is provided on the upper outer surface. An example of such a tube is shown in FIGS. 16 and 17. FIG. 16 is a cross-sectional view, and FIG. 17 is a J-longitudinal cross-sectional view. In these diagrams, heat transfer tubes! 6 is a flexible pipe with high thermal conductivity that is not attacked by liquefied gas or ground water, and the surface area increasing heat transfer body 17 is a protrusion that has a large heat transfer area and is easy to conduct heat, and is a liquid retention heat transfer body. Reference numeral 18 denotes a heat-transferring protrusion that allows easy exchange of vaporization heat and condensation heat. Note that the liquid retention heat transfer body for condensing and boiling has the same structure as that of the liquid receiving natural heat collection tube 8.

As shown in Fig. 8, Fig. 9 and Fig. 15, the natural heat collecting pipe 5
When the intermediate part of 7 to 7 is a non-heat exchangeable tube, a cladding tube is used, an example of which is shown in FIGS. 18 and 19. This has the same structure as the non-heat exchangeable tubes 1 to 4.

As mentioned above, when a temperature difference occurs between the upper and lower portions of the natural heat collection tubes 5 to 7, that is, when the temperature of a part becomes lower than the temperature of the lower part, the liquefied gas sealed in the tubes circulates naturally and continues collecting heat for free. This operates independently even when forced heat collection tubes 1 to 4, liquid natural heat collection tube 8, and second tubes 9 to II are not operating, and operates constantly as long as there is a temperature difference between the upper and lower sides. It is.

The cycle of liquefied gas in the natural heat collecting pipes 5 to 7 will be explained.

The natural heat collection tubes 5 to 7 are filled with a suitable amount of liquefied gas, and the lower part is filled with liquid liquefied gas, and the second part is filled with saturated vapor of the liquefied gas. First, when a temperature difference occurs in the range where the liquefied gas is in a liquid state, convection causes the higher temperature liquefied gas to move upwards and the lower temperature liquefied gas to move downwards, resulting in natural circulation. Next, when a temperature difference occurs in the range where the liquefied gas is saturated vapor, the saturated vapor of the sealed liquefied gas condenses in the lower temperature part of the upper part.
It releases the heat of condensation and becomes a liquid liquefied gas that falls freely.

If this liquid liquefied gas falls in one heap, and there is a high-temperature part along the way, it will be warmed there, take away the heat of vaporization, and evaporate to the saturated vapor pressure at that temperature. As a result, the natural heat collecting tubes 5 to 7 are constantly filled with liquefied gas at the saturated vapor pressure of the portion of the tube with the highest temperature. In this way, the enclosed liquefied gas operates automatically, absorbing the heat of vaporization and releasing the heat of condensation, while naturally circulating and transporting heat from the bottom to the top. This vertical difference is
We will continue to carry it for free, even if it is thousands of meters away. The factors that determine the capacity of the natural heat collecting tubes 5 to 7 are the temperature difference between the upper and lower sides, the material and size of the tubes, the material and structure of the heat transfer bodies inside and outside the tubes, and the type and amount of the enclosed liquefied gas.

In FIGS. 1, 8, 9, 10, 14, and 15, second pipes 9 to II are reciprocating pipes that radiate heat deep underground. The outgoing pipe 9, which has no heat exchange property with respect to the outside of the device, may be a pipe with heat exchange property with respect to the inside of the device.

In this example, the outgoing pipe 9 includes a non-heat exchange pipe 11, and
The cladding shown in FIGS. 18 and 19 is used.

The heat exchange tube IO is a flexible tube with high thermal conductivity that is not attacked by liquefied gas or ground water, and has a surface area increasing heat transfer body on its outer surface. When the natural heat collection pipes 5 to 7 and the liquid receiving natural heat collection pipe 8 reach deep underground, the deepest part of the second pipes 9 to I+ is It is folded back.

In this example, the liquefied gas in the second pipe often flows in as high-temperature, high-pressure steam, but when the heat of condensation is released as close to the ground as possible and the state changes from gas to liquid, the weight of the liquid liquefied gas increases. Balance is achieved and pressurized circulation is facilitated.

The cycle of the liquefied gas in the second pipes 9 to 11 will be explained with reference to FIGS. 1, 8, 9, 10, 14, and 15. As mentioned above, when the liquefied gas flows in as high-temperature, high-pressure steam, when it enters the heat exchange pipe 10, the heat of the surrounding heat storage body is collected by the first pipe, and the temperature becomes lower. There, it releases heat of condensation and becomes a liquid liquefied gas. For this reason, the specific weight of the liquefied gas increases, the circulation speed decreases, and the friction pressure loss in the pipeline decreases.The weight balance of the liquid liquefied gas in the outgoing and returning pipes allows the gas to circulate with a small pressure. It becomes like this. The temperature of this condensed liquid liquefied gas gradually decreases as it circulates inside the heat exchange pipe 10, and heat is radiated into the ground, which has a huge heat capacity (jt), reaching the temperature of the ground. The liquid liquefied gas, which has reached a temperature of Due to the frictional resistance that the circulating liquefied gas receives from the pipe wall, it is slightly lower than when it enters the device.

FIG. 9 shows an example in which the heat storage body 13 is placed in two parts, and the heat storage body 13 is surrounded by a heat insulating layer 14. In this way, if the heat storage body including the forced heat collection tubes 1 to 4 is provided in as many parts as possible, the frictional pressure loss of the forced circulation pipe can be reduced accordingly, and power can be saved. Also,
The forced heat collection tubes 1 to 4 shown in FIG. 15 can be provided inside the heat storage body.

FIG. 25 is an example of a control system using the device of the present invention. The device of the present invention is connected to a hot water supply, heating, cooling, and refrigeration cycle, and is also connected to a solar heat, atmospheric heat, and underwater heat collection cycle.

In Fig. 25, 29 and 30 of the natural circulation pipe system are cycles dedicated to heating, and a heat collecting coil 31 is installed in the circulation system.
, a radiator 32 and a regulating valve 33.

34.35.36.37 and 3 of the first forced circulation pipeline system
8 is a cooling/freezing cycle, which is a cycle that collects solar heat, atmospheric heat, and underwater heat.

This circulation system includes a compressor 39, a hot water supply coil 40, a heating coil 41, a device of the present invention, a safety valve 42, a filter 43, a heat exchanger 44, a dryer 45, an air vent 46, a regulating valve 47, an expansion valve 48, a cooling - Contains a heat collector 49 and a heat exchanger 44, this heat is used for hot water supply and space heating, and excess heat is stored underground.

34.35.50.51 and 3 of the second forced circulation pipeline system
8 is a cycle for collecting geothermal heat or heat stored underground, and the circulation system includes a compressor 39, a hot water supply coil 40, a heating coil 41.
Device of the present invention, safety valve 12, filter 43, heat exchanger 44
, dryer 45, air vent 46, adjustment valve 52, expansion valve 53,
It includes a liquid receiver 54, a regulating valve 55, a device of the present invention, a regulating valve 56, and a heat exchanger 44, and provides hot water and space heating using underground heat.

By automatically or manually operating the regulating valves 47, 52, 55 and 56, it is possible to operate the first forced circulation line system and the second forced circulation line system in parallel.

The water flows from the water supply pipe 57 to the hot water supply pipe 59 via the hot water tank 58. The path includes a check valve 60 and a safety valve 61, and the hot water tank 58 has a lower part as a hot water tank for heating and an upper part as a hot water tank for hot water supply.

The arrows in FIG. 25 indicate the flow of liquefied gas during operation. The liquefied gas cycle will be explained for each circulation pipe system.

The cycle of the natural circulation pipe system is a heating-only cycle, and when the regulating valve 33 is opened, the liquid liquefied gas accumulated in the pipe 29 is evaporated by the heat collecting coil 31 in the heating hot water tank. Then, it flows through the pipe 30 by natural circulation, releases condensation heat in the radiator 32, becomes a liquid liquefied gas, and freely falls in the pipe 29 by natural circulation. This released condensed heat is used for heating.

A number of irises 32 can be provided in lk rows.

The cycle of the forced circulation pipe system is a cycle that performs cooling and freezing, as well as a cycle that collects solar heat, atmospheric heat, and underwater heat.At the same time, this heat is used for hot water supply and space heating, and the surplus heat is This is a cycle in which water is stored underground.

The hot water tank 58 is prepared to be supplied with drinking water and to produce hot water. Here, when the regulating valve 52 is closed and the regulating valves 47, 55 and 56 are opened appropriately, and the compressor 39 is operated, the liquefied gas in the liquid receiver 54 and the forced heat collection pipes 1 to 4 is absorbed by the underground heat. It evaporates, is sucked into the compressor 39, is adiabatically compressed, and accumulates in the pipeline from the compressor 39 to the expansion valve 48, but does not pass through the liquid receiver 54 or the forced heat collection pipes 1 to 48.
When the liquefied gas in 4 is exhausted, the regulating valves 55 and 56 are closed and the operation is started.

When operating in this state, the high-temperature, high-pressure liquefied gas vapor adiabatically compressed by the compressor 39 releases condensation heat in the hot water supply coil 40 and further releases condensation heat in the heating coil 41.

Hot water is created by this condensation heat, but at this time, the liquefied gas reaches the temperature of the hot water tank 58 and enters the device of the present invention, and the heat of the liquefied gas is radiated underground by the device of the present invention and stored underground. At the same time, it becomes a liquid liquefied gas at underground temperature and exits the device of the present invention. The liquid liquefied gas, which has reached the underground temperature, undergoes heat exchange in the heat exchanger 44, is supercooled, becomes a lower temperature liquid liquefied gas, and reaches the expansion valve 48. A safety valve 42, a filter 43, a dryer 45, and an air vent 46 on the way prevent abnormally high pressure within the system 11 and remove foreign matter, moisture, and air.

The liquid liquefied gas adiabatically expanded by the expansion valve 48 absorbs vaporization heat in the cooling/collector 49 and evaporates, becomes superheated vapor in the heat exchanger 44, and is sucked into the compressor 39. At this time, the cooling/heat collector 49 provides cooling/freezing effects and collects solar heat, atmospheric heat, and underwater heat. Similar to the heat radiator 32, a number of cooling/heat collectors 49 can be provided in parallel.

When the temperature of the upper hot water tank for hot water supply of the hot water tank 58 becomes sufficiently high, the liquefied gas passes through the hot water supply coil 40 as high-temperature, high-pressure steam, and releases condensation heat in the heating coil in the lower hot water tank for heating. It becomes like this. However, when the temperature of this heating hot water tank becomes high enough, the liquefied gas becomes
Until the device of the present invention, high-temperature, high-pressure steam is produced. In this way, when the pipeline from the compressor 39 to the device of the present invention is filled with high-temperature, high-pressure steam, the volume of the liquefied gas increases and there is a surplus of liquefied gas, so when the regulating valve 52 is opened automatically or manually, Surplus liquid liquefied gas is stored in the liquid receiver 54.

The cycle of the second forced circulation pipe system is a cycle for supplying hot water and heating using underground heat, and can also be operated in parallel with the cycle of the first forced circulation pipe system.

The hot water tank 58 is prepared to be supplied with drinking water and to produce hot water. Here, when the compressor 39 is operated by closing the control valve 47, fully opening the control valve 56, and opening the control valves 52 and 55 moderately, the liquid receiver 54 and the forced heat collection pipes 1 to 1 are The liquefied gas is evaporated by the heat in the ground, sucked into the compressor 39, adiabatically compressed, and accumulated in the pipe line leading from the compressor 39 to the expansion valve 53.

In this state, the regulating valves 52 and 5 are automatically or manually operated.
5, when operated, hot water is produced and liquid liquefied gas is supercooled in the same cycle as the first forced circulation pipe system. This supercooled liquid liquefied gas is adiabatically expanded by the expansion valve 53, takes away the heat of vaporization and evaporates in the device of the present invention, and is turned into superheated vapor by the heat exchanger 44 and sucked into the compressor 39. During this time, heat from the ground is collected.

When the knee I regulating valve 47 is appropriately opened and the regulating valve 52 is appropriately closed, the cooling/heat collector 496 function 1. , parallel operation can be turned off while collecting heat from the sun. Additionally, when the temperature of the hot water in the hot water tank 58 becomes sufficiently high, surplus liquid liquefied gas will be generated, but by appropriately adjusting the #AI regulating valves 52 and 55, this surplus liquid liquefied gas can be transferred to the receiver. You will be asked to save it within 54 days.

In this way, the present invention not only utilizes geothermal heat directly, but also
A geothermal heat exchange system that uses solar heat, heat obtained from the air and water, and heat obtained from air conditioning and refrigeration to supply hot water and space heaters, stores the excess heat underground, and uses that heat to supply hot water and space heaters. ``Effects of the Invention'' As described above, the present invention provides a natural heat collection tube and a constriction tube that can efficiently and freely collect heat from any depth by using a liquid retention heat transfer element. A first pipe with a liquefied gas and a second pipe that can be efficiently penetrated to deep depths with a slight pressure by converting the liquefied gas into a liquid in two parts are inserted into a simple hole underground. A highly efficient underground heat exchange device with reduced frictional pressure loss in the pipeline can be obtained. This makes it possible to utilize the vast heat capacity and heat retention properties of the earth to store waste heat, solar heat, etc., adjust the excess or deficiency of heat, or directly utilize land heat. It is possible to dramatically increase the coefficient of performance of hot water supply, heating, cooling, and refrigeration cycles, and it is possible to utilize dormant and inexhaustible thermal resources.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a first embodiment of the underground heat exchange device according to the present invention; FIGS. 2, 3, 4, 5, 6, and 7 are respectively Δ sectional view, I3 sectional view, C sectional view, D sectional view, E sectional view and F sectional view shown in Figure 1;
8, 9, and 10 are front views showing second to fourth embodiments of the present invention, respectively; FIGS. 11, 12, and 13 are C sectional views shown in FIG. 1O, respectively. , I
T sectional view and ■ sectional view: Fig. 14 is a front view showing the fifth embodiment of the present invention; Fig. 15 shows the sixth embodiment of the present invention, including a longitudinal sectional view of the forced heat collection pipe portion Front view; 16th
The figure is an enlarged cross-sectional view showing examples of heat exchangeable natural heat collecting tubes shown in FIGS. 1, 8, 9 and 15:
Fig. 17 is an enlarged vertical cross-sectional view of J shown in Fig. 16; Fig. 18 is a non-heat exchangeable cross-sectional view shown in Figs. An enlarged cross-sectional view showing an example of a tube or a non-heat exchangeable part: FIG. 19 is an enlarged longitudinal section similar to that shown in FIG. 18! ; Fig. 20 is an enlarged cross-sectional view showing an example of the heat exchange portion of the forced heat collection tube shown in Figs. 1, 8, and 9; Fig. 21 is an enlarged longitudinal sectional view of the same as shown in Fig. 20; : Fig. 22 is a partial front view showing the lower part of the synthetic heat collection tube shown in Fig. 8; Fig. 23 is an enlarged vertical sectional view of M shown in Fig. 22; Fig. 24 is an enlarged N part shown in Fig. 23. Longitudinal cross-sectional view;
FIG. 25 is a schematic diagram showing an example of use of the underground heat exchange device according to the present invention. ■... Outgoing pipe of the forced heat collection tube that does not exchange heat with the outside of the device, 2... Outgoing pipe of the heat exchange part of the forced heat collection pipe, 3
... Return pipe of the heat exchange part of the forced heat collection pipe, 4... Return pipe of the forced heat collection pipe, which does not have heat exchange properties with respect to the outside of the device, 5.
... Heat exchangeable pipe of the natural heat collection pipe, 6... Non-heat exchangeable part of the natural heat collection pipe, 7... Non-heat exchangeable liquefied gas filled pipe of the natural heat collection pipe, 8... Receiver Liquid natural heat collection pipe, 9...Second pipe, outgoing pipe that does not have heat exchange with the outside of the device, IO/
...Second heat exchange pipe, 11...Second non-heat exchange pipe, 12...Backfilling material, RH...Underground poling hole, G L... Ground surface, 13... Heat storage body, 1
4... Heat insulation layer, 15... Liquid dispersion protrusion, 17... Surface area increasing heat transfer body or liquid retention heat transfer body, 18... Liquid retention heat transfer body, 32... Heat radiator, 39.・Compressor, 44・
...Heat exchanger, 49... Cooling/heat collector, 54... Liquid receiver, 58... Hot water tank. 1st m 2nd illustration 3z 4th figure Jj, 5th figure 7th figure 8z Stem? 2 nu/θ2 nm 1st Z decoy tea 14Ω haiku 2nd 17Δ 18th fJJ $1'f/Mth zo(Hmeizt(gl th zzm name 23)

Claims (10)

[Claims] (1) A forced reciprocating pipe in which a heat exchange part communicates with an outgoing pipe that does not have heat exchange properties to the outside of the equipment, and a return pipe that does not have heat exchange properties communicates with this heat exchange part to the outside of the equipment. A natural heat collection tube that has at least a heat exchanger section at the bottom and is completely closed, with liquefied gas sealed inside the tube; A natural heat collection tube that has at least a heat exchange section at the bottom and is closed. There is a natural heat collection tube that is a natural heat collection tube; the forced heat collection tube and natural heat collection tube are in a heat exchange relationship, or it is a synthetic heat collection tube in which the upper part of the natural heat collection tube communicates with the deepest part of the forced heat collection tube. , or the synthetic heat collecting pipe and the natural heat collecting pipe are in a heat exchange relationship with the first pipe; the heat exchangeable pipe is connected to the outgoing pipe that does not have heat exchange with the outside of the device, and this heat exchange A second pipe, which is a reciprocating pipe in which a non-heat exchange return pipe communicates with the pipe, is inserted into a hole bored underground, and these first pipe and second pipe are in a heat exchange relationship, and liquefy. A geothermal heat exchange device in which gas is circulated under reduced pressure in a forced heat collection pipe, naturally circulated in a natural heat collection pipe, circulated under reduced pressure and naturally in a synthetic heat collection pipe, and circulated under pressure in a second pipe. (2) The underground heat exchange device according to claim 1, wherein the outgoing pipe of the forced heat collection pipe has a throttle pipe or a throttle valve. (3) Claim 1 in which the heat exchange portion is spiral-shaped.
The underground heat exchange device according to item 1 or 2. (4) The underground heat exchange device according to any one of claims 1 to 3, wherein the natural heat collection pipe has a non-heat exchange portion. (5) The underground heat exchange device according to any one of claims 1 to 4, wherein the natural heat collection pipe has a non-heat exchangeable liquefied gas filled pipe. (6) The underground heat exchange device according to any one of claims 1 to 5, wherein at least the first pipe is inside a heat storage body surrounded by a heat insulating layer. (7) The underground heat exchange device according to any one of claims 1 to 6, wherein the pipes constituting the device are bendable pipes. (8) The underground heat exchange device according to any one of claims 1 to 7, wherein the forced collection pipe has a liquid dispersion projection on its inner surface. (9) The underground heat exchange device according to any one of claims 1 to 8, which has a liquid retention heat transfer body in the heat exchange portion of the first pipe. (10) The underground heat exchange device according to any one of claims 1 to 9, wherein the heat exchange pipe has a surface area increasing heat transfer body on its heat exchange surface.