TW201135166A - Terrestrial heat employing system - Google Patents

Abstract

A terrestrial heat employing system is provided which is capable of mitigating the labor for burying pine lines underground. The terrestrial heat employing system comprises a pipe line system (La) buried underground (G), the piping system (La) being configured to have a function allowing a heat exchange medium to flow through the interior thereof to perform a heat exchange with the terrestrial heat. A heat exchanger (1) connecting with a compression type air conditioner is installed in the piping system. The heat exchange medium is carbon dioxide. The heat of gasification and the terrestrial heat are exchanged. The pipe line system is composed of double pipes (9). The carbon dioxide of liquid phase flows along an inner pipe (91), while the carbon dioxide of gaseous phase flows along an outer pipe (92). For exchanging the heat of gasification and the terrestrial heat, the temperature in an area of the piping system beyond the heat exchanger (1) is set as 0 to 15 DEG C during warming operation and as 15 to 30 DEG C during heating operation.

Description

201135166 VI. Description of the Invention: TECHNICAL FIELD OF THE INVENTION The present invention relates to a technique for recovering geothermal heat and/or heat to the ground for efficient use in air conditioning, hot water supply, and other heat loads. [Prior Art] For example, in Japan, the temperature in the ground is about 15 °C throughout the year. Moreover, the temperature in winter in Japan is much lower than that at 15 °C. 'Summer temperature is much higher than 15 °C, so consider the effective use of air conditioning, hot water supply and other heat loads, for example. Temperature difference. Therefore, the technology for recycling geothermal heat has previously been proposed. Here, the recovery of geothermal heat (or heat removal into the ground) causes a well-known liquid phase heat medium (saline) to flow through a pipe buried in the ground, and heat exchange between the liquid phase heat medium and the geothermal heat (so-called "display" Heat and sensible heat exchange"). However, since the heat medium exchanges heat with the geothermal heat, it is necessary to secure a necessary area, so that the diameter of the piping through which the refrigerant flows can become large. Further, for example, in order to recover only the heat of the air conditioner, it is necessary to embed a very long pipe into a deep field in the ground. Moreover, there is a problem that a lot of cost is required in order to bury a large-diameter pipe in a deep underground field. Other prior art proposals include, for example, the use of groundwater as a heat medium to store heat under the ground (see Patent Document 1). However, in the related prior art (Patent Document 1), it is necessary to drill a vertical hole. When the heat storage amount increases, the depth of the vertical hole well must be increased, so that the above problem cannot be solved. [PRIOR ART DOCUMENT] [Patent Document 1] [Patent Document 1] Japanese Laid-Open Patent Publication No. H20-38507 [Summary of the Invention] [Problems to be Solved by the Invention] The present invention has been proposed in view of the problems of the prior art described above. The purpose is to provide a geothermal utilization system that can reduce the labor of burying pipes in the ground. [Means for Solving the Problem] The geothermal utilization system of the present invention has a piping system (La, 9) embedded in the ground (G), and the piping system (La, 9) is configured to have a heat medium flowing inside and geothermally The heat exchange function, the piping system (La, 9) (for example, an air conditioning load 3 or a hot water supply load 8 is attached) is connected to a compression type air conditioner (having a first heat medium line Lb, an outdoor unit 1, an indoor unit) 2. The heat exchanger of the compressor 4, the pressure reducing valve V3 and the compression air conditioner of the four-way valve V4 (for example, when the heat load is a compression type air conditioner, the outdoor unit 1), the heat medium is carbon dioxide, carbon dioxide Gasification heat (condensation heat) and geothermal heat exchange, the piping system (La, 9) is composed of a double tube (9), and the liquid phase carbon dioxide flows through the inner tube (9 1 ), and the carbon dioxide in the gas phase flows outside. The tube (92), in order to exchange heat of vaporization (condensation heat) of carbon dioxide with geothermal heat, the temperature in the field of the heat exchanger (outdoor unit 1) in the piping system (La, 9) is set to be implemented as a greenhouse It is 0~15 °C during operation and 15~3 when running cold room (TC. In room 1) Machine applicator exchange heat t 5 - Λ 1 when the state is the same as when the S is transported, Γ ,, 9 transport the La, the house C warm} system p pipe real 30 match when ~3 C 5 degrees 1 when the temperature is flowing, the domain turns t heavy ^ late

The external solid room is the gasification temperature of carbon dioxide in C, JTJ 201135166 (La, 9). When the house of carbon oxide is operated (La, 9 ) I is more than 15 high, the carbonization heat of the above-mentioned configuration (3 1 ° C) is exchanged in the bottom ( G ) of the carbon in the ground. Also, the heat of vaporization and the sensible heat of the heat discharge correspond to the pressure in the piping system (La, 9). Further, when the vaporization temperature is too low (when the heating temperature is less than 0 ° C and the cold room operation is less than 15 ° C), the pressure of the piping becomes too low, which is not suitable for the circulation of carbon dioxide. Further, when the vaporization temperature is too high and the temperature of the greenhouse is turned to its temperature, the pressure of the piping system (La, 9) becomes too dangerous. Further, when the operation of the cold room exceeds 30 °C, the carbon dioxide of the circulation piping system (La, 9) is too close to the gas-liquid mixing point (31 ° C), which is not suitable. Further, when the critical point is reached and the carbon dioxide becomes a gas-liquid mixed state, the heat exchange efficiency between the geothermal heat and the second oxidation is lowered. Further, in the present invention, it is preferable that the piping system (La, 9D) is divided into a plural system. Alternatively, the piping system (La, 9E, 9F) is preferably spiraled in the ground cj. [Effect of the Invention] According to the present invention having the above configuration, the heat of vaporization (condensation heat) of carbon dioxide and the geothermal heat are used by using a dioxygen heat medium, that is, when the geothermal heat is recovered, the carbon dioxide in the liquid phase is recovered from the geothermal heat when the heat is discharged. In the bottom (G), the carbon dioxide in the gas phase will condense into the ground (G) to condense. In other words, the latent heat of the heat medium composed of carbon dioxide and the geothermal heat apply the so-called "latent heat-sensible heat exchange". Here, "latent heat-sensible heat exchange j and previous geothermal utilization equipment

S 201135166 Compared with the so-called "sensible heat-sensible heat exchange" of heat and geothermal heat, each unit of heat medium can recover or discharge a large amount of heat, so that the heat efficiency can be greatly improved. Further, the carbon dioxide has a larger heat capacity than the brine used in the prior art. Therefore, according to the present invention, the heat medium can efficiently recover the geothermal heat or efficiently discharge the heat into the ground. Therefore, the piping system (La, 9) embedded in the ground (G) can be shortened and thinned. Therefore, when the piping (La, 9) is buried in the ground (G), it is not necessary to dig deep into the deeper area of the ground. It is not necessary to obtain a large space for embedding piping. Herein, in the prior art in which the brine heat medium is used, it is necessary to arrange the piping in the underground of the brine along the foundation pile along the foundation pile, or to arrange the piping in the foundation in the foundation pile. Incurring additional costs. Further, when the piping in the underground flowing through the brine is not disposed near the pile in the ground, it is necessary to control the well for burying the piping in the underground, and thus the cost occurs. When the present invention which can shorten and reduce the diameter of the piping system (La, 9) embedded in the ground (G) is used, these costs can be reduced. Further, according to the present invention, the piping system (La) of the ground (G) is constituted by the double pipe (9), so that, for example, when the geothermal heat (warm operation) is recovered, it is sent from the heat exchanger (for example, the outdoor unit 1). The liquid phase carbon dioxide is lowered in the inner tube (91) of the double tube (9). Here, the liquid phase carbon dioxide has a larger specific gravity than the gas phase carbon dioxide, so the liquid phase carbon dioxide falls downward by its weight. In addition, when liquid phase carbon dioxide recovers geothermal heat (heat of vaporization) to vaporize,

S 201135166 The gas phase carbon dioxide has a smaller specific gravity than the liquid phase carbon dioxide. The heat exchanger (for example, the outdoor unit 1) rises and the tube (92) rises outside the double tube (9). Therefore, even if no external power is applied, liquid carbon dioxide and gas phase carbon dioxide will flow through the double tube. Further, according to the present invention, the temperature of the field of the heat exchanger (outdoor unit 1) flowing out of the piping system (La, 9) is set to be 0 to 15 °C when the greenhouse operation is performed, and 15 when the cold room is operated. ~30 °C, this temperature (0~15 °C when the greenhouse is running, 15~30 °C when the cold room is running) is the carbon dioxide gas in the piping system (La, 9) in this operating state. Temperature. According to the inventors' research, when the temperature is the vaporization temperature of carbon dioxide, in the present invention, the efficiency of the greenhouse or the efficiency of the cold room is most enhanced. In the present invention, if the (G) piping system (9D) in the ground of the complex system is provided, the geothermal heat can be efficiently recovered and the heat can be discharged to the ground. Here, if the (G) piping system in the ground is arranged in a spiral shape (9E, 9F), the circumferential length is three times the diameter. Therefore, the depth of excavation for setting the piping in the ground can be 1/1 of the prior art. 3 or so. [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the illustrated embodiment, a system in which heat in the ground is utilized in an air conditioner is exemplified. In other words, in the embodiment shown in the figure, the heat load is, for example, connected to the air conditioner 3. Fig. 1 to Fig. 16 show a first embodiment (including various modifications) of the present invention. .201135166 Here, Fig. 1, Fig. 3, and Fig. 4 are diagrams for easily understanding the operation, and the piping (La) in the ground is partially displayed to be different from the actual one, and the piping (La) in the ground is The composition is described later. Further, in Fig. 1, there is shown a control system (control unit 50 or the like) having a cold room switching control. However, in Figs. 3 and 4, the illustration of the control system is omitted. First, the first embodiment will be briefly described with reference to Fig. 1 . In the first embodiment, the first geothermal system (hereinafter referred to as "outdoor unit") and the second heat exchanger (hereinafter referred to as "indoor unit") 2 are indicated by the element number 1 〇〇. 'The air conditioner 3 (which also includes a warm water bed heater) as a heat load, the piping system La buried in the ground, the 1st heat medium line Lb, and the 2nd heat medium line Lc. The piping system La buried in the ground is provided with a second heat exchanger 1, a pump 5, on-off valves V1, V2, and temperature detectors 6, 7. Further, liquid phase carbon dioxide or gas phase carbon dioxide as a heat medium flows through the piping system La (hereinafter, carbon dioxide is described as C〇2). The piping system La has a line Lal~La5. The pipeline Lai is connected with the discharge port 5 of the pump 5 and the valve body VI. The pipe body La2 is connected to the valve body VI and the connection port n of the outdoor unit 1. In the line La2, a branch point B1 is provided in the vicinity of the valve body VI, and a temperature detector 6 is interposed in the vicinity of the port i i . The connection port 12 of the outdoor unit 1 and the valve body V2 are connected to the line La3. In the line La3, a branch point B2 is provided in the vicinity of the valve body V2, and a temperature detector 7 is interposed in the vicinity of the port 12. The line La4 is connected to the valve body V2 and the suction port 5i of the pump 5. -10- .201135166 The pipeline La5 is connected to the bypass line of the branch point B1 and the branch point B2 and bypassing the pump 5. In Fig. 1, except for the line La2 of the piping system La and the outdoor unit 1 side of the line La3, the piping system La is entirely buried in the ground. The configuration of the portion buried in the ground will be described later with reference to Figs. 5 to 13 . In Fig. 1, the first heat medium line Lb is provided with an outdoor unit 1, an indoor unit 2, a compressor 4, a pressure reducing valve V", and a four-way valve V4 to constitute a compression type air conditioner. Further, primary brine (e.g., chlorofluorocarbon R 1 3 4 ) as a heat medium flows through the first heat medium line Lb. The first heat medium line Lb has lines Lb l to Lb5. The line Lb 1 is connected to the discharge port 4 of the compressor 4 and the opening Vpl of the four-way valve V4. The line Lb2 is connected to the opening Vp2 of the four-way valve V4 and the connection port 2 of the indoor unit 2. The connection port 22 of the indoor unit 2 and the interface 13 of the outdoor unit 1 are connected to the line Lb 3. A pressure reducing valve V3 is interposed in the line Lb 3. The line Lb4 is connected to the connection port 14 of the outdoor unit 1 and the opening Vp3 of the four-way valve V4. The line Lb5 is connected to the opening Vp4 of the four-way valve V4 and the suction port 4i of the compressor 4. The second heat medium line Lc is provided with the indoor unit 2 and the air conditioner 3. The secondary brine as a heat medium flows through the heat medium line Lc. The second heat medium line Lc has a line Lcl and a line LC2. The connection port 31 of the air conditioner 3 and the interface 23 of the indoor unit 2 are connected to the line Lcl. The connection line 24 of the indoor unit 2 and the air conditioner 3 are connected to the pipeline Lc2.

S -11 - 201135166 connector 32. As shown in Fig. 1, the geothermal utilization system 100 has a control unit 50 as a control mechanism. The control unit 50 is connected to the compressor 4, the pump 5, and the switching valves VI, V2 via the control signal line So. Here, in Fig. 1, the symbol G indicates the ground and the symbol Gf indicates the surface. Next, the cold room/room heating switching control when the air conditioner 3 of Fig. 1 is operated will be described with reference to Fig. 2 . In step S1 of Fig. 2, an unillustrated control panel having a control unit 50 is operated by an automatic control or a manual operation to operate the air conditioner 3. In step S2, the automatic operation or the manual operation is used to determine the operation of the warm room or the operation of the cold room, and the operation after the decision is performed. When the greenhouse operation is performed ("warm house" in step S2), the control unit 50 locks the piping system La opening/closing valves VI, V2 embedded in the ground, and stops the pump 5 attached to the piping system La (step S3). ). Then, proceeding to step S4, the four-way valve V4 is switched to the warm room side. When the four-way valve V4 is switched to the greenhouse side, the four-way valve V4 opening Vpl communicates with the opening Vp2, and the opening Vp3 communicates with the opening Vp4 (refer to FIG. 3), and if the cold room operation is performed ("cold room" in step S2) Then, the control unit 50 opens and closes the piping system La opening and closing valve VI, V2, and acts on the pump 5 of the piping system La (step S5). Then, the process proceeds to step S6' to switch the four-way valve V4. When the four-way valve V4 is switched to the cold room side, the four-way valve V4 opening Vpl is in communication with the opening vp3, and the opening Vp2 is in communication with the opening Vp4 (refer to FIG. 4). When the step S4 or the step S6 ends, the process proceeds to In step S7, the control unit -12-201135166 yuan 50 acts to clamp the compressor 4 of the first heat medium line Lb to perform the greenhouse operation or the cold room operation, and then proceeds to step S8. In step S8, the control unit 50 determines the greenhouse. Whether the operation of the operation or the operation of the cold room has been completed. When the end operation has been completed (YES in step S8), the control is ended. If the end operation is not performed (step S8 is NO), the process returns to the step. S2, after step S2 is repeated. Referring to Fig. 3, the operation of the greenhouse operation will be described. When the greenhouse is operated as shown in Fig. 3, as described above, the opening and closing valve VI of the piping system La is closed, and the V2 system is locked, and is attached to the piping system La. Then, the four-way valve V4 interposed in the first heat medium line Lb is switched to the greenhouse side, the opening Vpl of the four-way valve V4 is in communication with the opening Vp2, and the opening Vp3 is in communication with the opening Vp4. Then, the compressor 4 Actuated, the heat medium (for example, the chlorofluorocarbon R134) is compressed into a high-temperature and high-pressure gas phase fluorine 'chlorinated carbide' from the discharge port 4 of the compressor 4, and the high temperature and high pressure gas phase chlorofluorocarbon discharged from the compressor 4 is discharged. The carbide flows into the heat exchange unit 2h of the indoor unit 2 through the line Lbl, the opening Vpl of the four-way valve V4, the opening Vp2, and the line Lb2 from the first connection port 21 of the indoor unit 2. The heat exchange unit 2h of the indoor unit 2 The high-temperature high-pressure gas phase chlorofluorocarbon is heat-exchanged with the heat medium flowing through the second heat medium line Lc (heat medium flowing from the air conditioner 3 through the line Lc 1 into the indoor unit 2: for example, water). In the heat exchange, the water flowing in the heat medium line Lc (heat medium) is heated, high temperature The high-pressure gas phase chlorofluorocarbon loses the heat of vaporization and condenses into a high-pressure liquid phase-13- 201135166 CFC. The indoor heating machine 2 is heated from the pipeline Lc2 to the air conditioner 3, to the air conditioner 3 In the indoor unit 2, the water is supplied to the indoor unit 2 via the line Lcl. The water is supplied to the indoor unit 2 via the line Lcl. The high-pressure liquid phase chlorofluorocarbon is supplied from the connection port 22 of the indoor unit 2 to the heat exchange unit 1 h in the outdoor unit 1 from the outdoor unit 1 connection port 13 via the line Lb3. When the high-pressure liquid phase chlorofluorocarbonized stream passes through the line Lb3, it is depressurized by the pressure reducing valve V3 to become a low-pressure liquid phase chlorofluorocarbon. In the heat exchange unit 1h of the outdoor unit 1, the low-pressure liquid phase chlorofluorocarbon is heat-exchanged with the gas phase CCh flowing through the piping system La buried in the ground, and the heat of vaporization is introduced. Then, in order to introduce vaporization heat to the low-pressure liquid phase chlorofluorocarbon, the gas phase C 〇 2 flowing through the piping system La is condensed to form a liquid phase C 〇 2 . In other words, in the heat exchange unit 1h, the low-pressure liquid phase chlorofluorocarbon is exchanged with the gas phase CCh as heat of vaporization of latent heat, and so-called "latent heat-latent heat exchange" is performed. As a result, the low pressure liquid phase chlorofluorocarbon gasification becomes a low pressure gas phase chlorofluorocarbon. The low-pressure gas-phase chlorofluorocarbon gasified by the outdoor unit 1 is connected to the opening of the outdoor unit 1 through the port 14' line 1^4 and the four-way valve ¥4. 3. What is the opening? 4 and the line Lb5 flows into the inflow port 4i of the compressor 4. Further, the gas phase chlorofluorocarbon which is compressed to a higher temperature and pressure by the compressor .4 is discharged from the discharge port 4 。. Further, the liquid phase C〇2 condensed in the outdoor unit is discharged from the connection port 1 of the outdoor unit 1, and flows through the line La2 by its own weight. When flowing through the line La2, the liquid phase C〇2 is heated by the heat of the ground, and the phase changes to the gas phase C〇2. When the greenhouse is running, the on-off valves V 1, V2 are closed 'so C' flowing through the line La2 flows through the bypass La5 from the divergent point B1, and flows from the divergent point B2-14-.201135166 into the pipeline La3 β geothermal is fully invested Flow into line C3 of line La3 to vaporize C〇2. Here, the liquid phase C 〇 2 discharged from the outdoor unit 1 has a larger specific gravity than the gas phase C 〇 2 . Therefore, the gas phase C 〇 2 in the line La3 rises in the line La3 so that the liquid phase C 〇 2 is pressed out. Therefore, when the greenhouse is running, it is not necessary to activate CCh to use the pump 5. The gas phase C〇2 rising in the line La3 flows into the outdoor unit 1 from the connection port 12. Moreover, as indicated above, the gasification heat is supplied to the low pressure gas phase chlorofluorocarbon. Next, referring to Fig. 4, a case where the operation of the cold room is performed will be described. When the cold room of Fig. 4 is operated, as described above, the opening and closing valves VI, V2 which are attached to the piping system La are opened, and the pump 5 is attached to the piping 5 of the piping system La. In the piping system La, the liquid phase C 〇 2 of the pump 5 boost is raised at the discharge port 5 〇, the line Lai, the switching valve VI, and the line La2. Further, it flows into the heat exchange unit 1 h in the outdoor unit 1 via the connection port 1 1 . In the outdoor unit 1, the liquid phase C 〇 2 exchanges heat with the high-pressure gas phase chlorofluorocarbon discharged from the discharge port 4 of the compressor 4 . The liquid phase C 〇 2 which is put into the heat of vaporization becomes the gas phase CCh, and flows into the suction port 5i of the pump 5 through the connection port 12, the line La3, the opening and closing valve v2, and the line La4. Here, the negative pressure of the suction port 5i of the pump 5 acts on the line La3, so that the gas phase C〇2 which is vaporized in the outdoor unit 1 descends toward the bottom side of the line La3.

In the gas phase C 〇 2, during the fall of the line La3, the heat of vaporization is discarded into the ground and condensed to become the liquid phase CCh. Further, by the negative pressure of the suction port 5i of the pump 5, the liquid phase C〇2 does not divide in the line La5, and the entire amount flows through the line La4, and is sucked by the suction port 5i of the pump 5. S -15- 201135166 When the cold room is running, the four-way valve V4 clamped in the first heat medium line Lb is switched to the cold room side, the opening Vpl of the four-way valve V4 is in communication with the opening Vp3, and the opening Vp2 is in communication with the opening Vp4. The compressor 4 is started, and the chlorofluorocarbon R1 34 as a heat medium is compressed into a high-temperature and high-pressure gas phase chlorofluorocarbon, which is discharged from the discharge port. The high-temperature and high-pressure gas-phase chlorofluorocarbon discharged from the compressor 4 flows into the heat exchange portion lh of the outdoor unit 1 from the connection port 14 of the outdoor unit 1 via the opening Vpl' opening Vp3 and the line Lb4 of the line Lb 1' four-way valve V4. . The high-temperature and high-pressure gas-phase chlorofluorocarbon in the heat exchange unit 1h of the outdoor unit 1 is supplied with heat of vaporization (heat exchange). The line La2 from the piping system La flows into the liquid phase c〇2 of the connection port 1 1 and is condensed to become High pressure liquid phase chlorofluorocarbons. At this time, the liquid phase C〇2 of the piping system La is vaporized. The high-pressure liquid phase chlorofluorocarbon condensed in the outdoor unit 1 is discharged from the connection port 13 to the line Lb3, and is decompressed into a low-pressure liquid phase chlorofluorocarbon by a pressure reducing valve V3 interposed in the line Lb3. The low-pressure liquid phase chlorofluorocarbons flow from the connection port 22 into the heat exchange portion 2h of the indoor unit 2. In the heat exchange unit 2h, the low-pressure liquid phase chlorofluorocarbon flowing through the first heat medium line Lb and the water (heat medium) flowing through the second heat medium line Lc are heat-exchanged, and the heat of vaporization is introduced to become a low pressure. Gas phase chlorofluorocarbons. At this time, the water flowing through the second heat medium line Lc is cooled to reduce the amount of heat of vaporization flowing through the first heat medium line Lb. In other words, in the indoor unit 2, the sensible heat of the water (heat medium) flowing through the second heat medium line Lc and the latent heat exchange of the chlorofluorocarbon flowing through the first heat medium line Lb (sensible heat-latent heat exchange) ). The cold water discharged from the connection port 23 of the indoor unit 2 from the air conditioner 3 connection port -16- 201135166 31 flows into the air conditioner 3, and the air conditioner is provided with a space of the air conditioner. The refrigerant (water) cools the indoor air in the air conditioner 3, and is sent from the connection port 32 to the connection port 24 of the indoor unit 2 via the line Lc2. Further, the low-pressure gas-phase chlorofluorocarbon gasified in the indoor unit 2 passes through the connection port 2 of the indoor unit 2, the line Lb2, the opening Vp2 of the four-way valve V4, the Vp4, and the line Lb5, from the suction port 4i of the compressor 4. Being inhaled. Further, the compressor 4 is compressed to be discharged from the discharge port 4 of the high pressure gas phase chlorofluorocarbon. When the greenhouse is operated as shown in Fig. 3, the CO flowing through the piping system La can be circulated on the ground side and the ground side even if the pump 5 is not operated. On the other hand, in the operation of the cold room shown in Fig. 4, as described above, the C〇2 flowing through the piping system La cannot be circulated in the piping system La unless the pump 5 is operated. Referring to Figure 7 to Figure 9, the relevant pump 5 and pipeline Lal, La4, La5 are detailed later. Here, even in the warm room operation shown in FIG. 3, even in the cold room operation shown in FIG. 4, in the outdoor unit 1, C〇2 flowing through the piping system La and flowing through the first heat medium line Lb's chlorofluorocarbon heat exchange heat of vaporization, the so-called "latent heat and latent heat exchange", so that a large amount of heat is exchanged and the efficiency is high. In the first, third, and fourth figures, in order to simplify the flow direction of the heat medium (C〇2), the piping system La in which the heat medium flows in the ground is expressed as a U-shaped reciprocating path. Tubular, however, in the illustrated embodiment, the pipe in the relevant ground is formed by a double pipe. The relevant double pipe will be described with reference to Figs. 5 to 12 . -17- 201135166 In the fifth aspect, the double pipe 9 constituting the piping system La is composed of an inner pipe 91 and an outer pipe 92. As shown in Fig. 5, in the case of a warm room (see Fig. 3), the liquid phase C〇2 sent from the outdoor unit 1 falls in the inner tube 91 of the double pipe 9. The liquid phase C 〇 2 has a larger ratio than the gas phase C 〇 2, so it falls down to the lower side by its weight. When the heat of vaporization is introduced into the liquid phase C〇2 from the ground, the liquid phase C〇2 is vaporized to become the gas phase C 0 2 . Further, since the gas phase C 0 2 has a smaller specific gravity than the liquid phase C 〇 2, it rises toward the outdoor unit 1 along the outer tube 92 of the double pipe 9. That is, in the greenhouse of Fig. 3, the liquid phase C 0 2 which must be sent to the bottom of the ground is dropped downward by the inner tube 91, and the gas phase C 〇 2 which is returned to the bottom of the ground rises in the outer tube 92, so The power used by the heat medium c〇2 flowing through the double pipe 9 does not need to be supplied from the outside. When referring to the cold room explained in Fig. 4, as shown in Fig. 6, the gas phase C〇2 sent from the outdoor unit 1 is lowered in the outer tube 92 of the double pipe 9. Further, the gas phase c〇2 puts the vaporization heat into the soil G to condense the liquid phase C〇2 toward the outdoor unit 丨' along the inner tube 91 of the double tube 9. Here, in the case of a cold room, it is different from that in a greenhouse, and it is required to reduce the weight of the chrysanthemum which has a small specific gravity: the phase C〇2 and the liquid phase c〇2 having a large specific gravity. Therefore, as shown in Fig. 7, the first switching valve Vbl is provided at the bottom of the outer tube 92 of the double pipe 9, and the pump 5 for CCh circulation is provided in front of it. Then, the second switching valve Vb 2 is attached to the lower end of the inner tube 91. Here, when the second switching valve Vb2 is opened, the front end of the inner tube 91 communicates with the outer tube 92, and when the second switching valve Vb2 is closed, the front end of the inner tube 91 is closed. The discharge port of the pump 5 is connected to the bottom of the inner pipe 91 by a line 93 -18- 201135166. The third switch valve Vb3 is placed in the line 93. In the warm room, as shown in Fig. 8, the first switch 3 switching valve Vb3 is closed, and the second switching valve Vb2 is opened. As described above, in the warm room, the liquid heat and heat exchange from the inner pipe 91 is introduced into the gas phase C〇2 by the heat of vaporization. Further, the second switching valve Vb2 flows into the bottom portion near the bottom of the outer tube 92 and rises along the outer tube 92. Here, the gas phase CCh and the liquid phase are in a so-called "gas-liquid two-phase flow" to flow into the outer tube 92, and exchange heat with the geothermal heat to completely become the gas phase CO: while the outdoor unit is not shown, the liquid is The phase c〇2 may be provided with a mechanism for promoting gasification (for example, a heating mechanism) in the ground. In the cold room, as shown in Fig. 9, the inner pipe 91 is opened and closed, the valve Vb2 is opened, the first switching valve Vb1 is opened, and the third switch is operated by the pump 5, by actuating the pump 5, and the negative pressure acts on the outer pipe 92. 'The smaller gas phase C〇2 drops. The gas phase c 〇 2 descending from the outer tube 92 is discharged to the bottom of the ground to condense. Further, the liquid phase CCh which is discharged into the liquid phase c〇2 by the pump 5 is sent to the outdoor unit 1 via the line 93 and the third opening from the inner tube 91. As shown in FIG. 5 to FIG. 9 , 'the difference between the heat medium from the outdoor unit 1 and the heat medium entering the outdoor unit 1 in the tube 9 or the tube 92 flowing outside the double tube 9 is different in the cold room. . Fig. 10 is a view schematically showing the end portion of the double tube 9 at the outdoor unit (the piping is constituted. The valve Vbl and the phase C 〇 2 and the ground, the gas phase C 〇 2 are mixed from the outer tube 92 C 〇 2, even if so, 1 When the gas is not vaporized, w·丄山_t— /rAr r\ 刖% brother 2 ϊ V b 3, and then, + specific gravity 3, will attract the gasification thermopulse 5. Close the valve Vb3, conservatory When flowing out through the upper end of the double pipe)

S -19- 201135166 In Fig. 10, the upper end of the inner tube 91 of the double tube 9 is connected to the line La2 shown in Figs. 1 to 3, and the upper end of the outer tube 92 is connected to the first to third figures. Pipeline La3. Further, in the case of a cold room and a warm room, the flow direction of C〇2 flowing through the piping system La and the chlorofluorocarbon flowing through the first heat medium line Lb may be different from those shown in Figs. 1 to 3 . In order to cope with such a situation, as shown in Fig. 1, the four valve bodies Val to Va4 may be interposed on the piping system La side, and the line La2 and the line La3 may communicate with the inner pipe 92 or the outer pipe 93. In Fig. 11, the line La2 connected to the port 1 of the outdoor unit 1 and the line La3 connected to the port 12 of the outdoor unit 1 are in communication with the outer tube 92. An opening and closing valve val' is interposed in the line La2, and an opening and closing valve Va2 is interposed in the line La3. The line La6 is divergent from the branch point Ba2 of the line La2 and is in communication with the inner tube 91. Further, the line La7 is branched from the branch point Ba3 of the line La3 and communicates with the inner tube 91. The opening and closing valve Va3 is interposed in the line La6, and the opening and closing valve Va4 is interposed in the line La7. The first modification of the double pipe 9 which has been described with reference to Figs. 5 to 11 is not shown in Fig. 12. In the first modification of Fig. 12, the outer tube 92A of the double tube 9A has irregularities formed in the longitudinal direction (the center line CL direction). By forming the relevant concavities and convexities, the surface area is increased and the heat exchange efficiency is improved. Although not shown, the inner tube 91A of the double tube 9A may have irregularities formed in the longitudinal direction.

S -20- 201135166 Fig. 13 shows a second modification of the double pipe 9. In the second modification of Fig. 13, the tube 92B outside the double tube 9B is provided with irregularities in the circumferential direction, so that the surface area is increased and the heat exchange efficiency is improved. In the second modification, although not shown, the inner tube 91B of the double tube 9B may be provided with irregularities in the circumferential direction. Further, although the modification of the double pipe 9 is not shown, a fin is provided in the pipe (or the outer pipe and the inner pipe) outside the double pipe. According to the first embodiment, the heat medium is exchanged with the geothermal heat by using C〇2, and the heat of vaporization (condensation heat) of c〇2 is exchanged with the geothermal heat, or is discharged from the heat medium to the ground. Further, the latent heat of the c〇2 heat medium and the geothermal heat are subjected to so-called "latent heat-sensible heat exchange". Here, the "latent heat-sensible heat exchange" compares with the "sensible heat-sensible heat exchange" in the heat medium and geothermal heat in the previous geothermal utilization equipment, and the heat medium per unit amount can recover or discharge a large amount of heat. So the heat efficiency is very good. Further, C〇2 has a larger heat capacity than the brine used in the prior art. Therefore, according to the first embodiment, the heat medium can efficiently collect the geothermal heat or efficiently discharge the heat to the ground G. Therefore, the piping system La (the double pipe 9) embedded in the ground G can be shortened and thinned. Therefore, when the piping system La (double pipe 9) is buried in the ground, it is not necessary to control the deeper areas in the ground, and it is necessary to embed the piping without the need for a large space. In the prior art case where the liquid phase brine is used in the heat medium, the piping system in the bottom of the liquid phase brine must be disposed along the foundation pile configuration, or the piping system in the ground pile must be disposed in the foundation pile, when the foundation pile is constructed , will cause the extra cost of -21-201135166 to occur. Further, when the piping in the underground of the brine is not disposed near the pile in the ground, the well for burying the piping system in the underground must be excavated to a deeper area in the ground, and therefore, a cost is incurred. According to the first embodiment, the piping system La (the double pipe 9) embedded in the ground G can be shortened and thinned, so that the above-described cost does not occur. In the first embodiment, the double pipe 9 constitutes a piping system La of G in the ground. In the warm room operation, the liquid phase CCh having a large specific gravity falls in the inner tube 91 of the double pipe 9, and the gas phase CCh which is put into the geothermal heat (gasification heat) and vaporizes rises in the outer pipe 92 of the double pipe 9 When the CO 2 cycle as the heat medium circulates in the piping system La, no external power is required. Therefore, the running cost of the greenhouse can be reduced. Fig. 14 shows a first modification of the first embodiment. According to the inventors' research, it can be understood that the temperature of the heat medium sent from the outdoor unit 1 to the ground side is a predetermined temperature (for example, the temperature of the liquid phase C〇2 sent from the outdoor unit 1 to the ground when the greenhouse operation is performed). 0~1 5 °C 'When the cold room is running, the temperature of the gas phase CCh from the outdoor unit 1 to the ground is 15~30 °C), the efficiency of the greenhouse or the efficiency of the cold room is increased the most. Therefore, the temperature of the heat medium sent from the outdoor unit to the ground side is preferably maintained at the predetermined temperature (e.g., 6 ° C in a greenhouse) to enable efficient operation. Here, in the experiment of the inventor, in the greenhouse, when the temperature of the liquid phase C〇2 sent from the outdoor unit to the ground is 6 ° C, it is buried in the ground and communicated with the outdoor unit as a heat medium. The pressure of C〇2 is 4MPa~5 MPa ° The temperature of CCh from the outdoor unit to the middle side of the ground and the temperature (pressure) of -22-201135166 CCh at that time point and the amount of heat medium c〇2 in the whole system Therefore, the modification of Fig. 14 constitutes the temperature (pressure) in response to C〇2 sent from the outdoor unit 1 to the middle side G, and the amount of adjustment system total c〇2 is adjusted in the modification of Fig. 14 to adjust c. The amount of 〇2 is to control the opening degree of the regulating valve Vc in the inflow path (c〇2 supply line) Lc of the C〇2 supply source 1〇 and the system La attached to the piping system La 9 connected to the ground. The upper discharge valve Va (having a function opening degree as a flow rate adjustment valve. In Fig. 14, the outdoor unit 1 and the underground piping system La9 also constitute a closed circuit by the side piping La. Moreover, in Fig. 14, in order to simplify As shown in the figure, the CCh system La9 on the bottom side does not appear as a double tube, but the U-shaped tube that appears as a reciprocating line is in Fig. 14, and the ground side is equipped with La is composed of a line La20 and a line, and the connection port Pa2 of the line La20 and the piping system La9 is connected to the connection port 11 of the machine 1, and the connection of the line La30 to the outdoor unit 1 is connected to the connection port Pa3 of the piping system La9. A discharge valve Va (flow rate adjustment valve) is interposed. Further, in the line La20, a C〇2 supply line Lc is connected between the outdoor unit 1 and the discharge valve Va, and the C〇2 supply line Lc is connected to the C〇2 source 10 In the C〇2 supply line Lc, the CCh supply amount adjustment valve Vc is installed to control the opening degree of the C〇2 supply amount adjustment valve Vc, and the supply amount of the C 0 2 in the piping is adjusted. In the line La20, In the field between the discharge valve Va and the connection Pa2 in the pipe La9, the temperature detector 6 (or the pressure detector 40) is placed on the ground of the flow rate discharge pipe 0 La30 outdoor 3 12 collar supply, borrowing 9 a Interface -23- 201135166 Here, in Fig. 14, the temperature detector 6 (or the pressure detector 40) is connected to the line La 20, but in the actual equipment, the 'clip is attached to the line La20 and The line in the line La30 and serving as the heat medium C〇2 from the outdoor unit 1 outflow side. Further, if the C〇2 of the heat medium flows into the line of the outdoor unit 1 side during the operation of the greenhouse and the operation of the heating and cooling room, the temperature detector 6 (or the pressure detector 4) is preferably sandwiched between the line La20 and the line. La30 is both. The modification of Fig. 14 has a control unit 50A as a control mechanism. The control unit 50A connects the temperature detector 6 and the pressure detector 40 through the input signal line Si. Further, the control unit 50A connects the discharge valves Va and C2 to the supply amount adjustment valve Vc via the control signal line So. Next, the control of the supply amount of C〇2 will be described mainly with reference to Fig. 15 and the reference to Fig. 14 for reference. In Fig. 15, step S11 is performed by the temperature detector 6 to measure C〇2 flowing through the line La20 (for example, when the greenhouse is in the liquidus C〇2 temperature, or by the pressure detector 40, the flow through the line La20) C0: pressure (step S12). In step S13, the control unit 50A determines the opening degree of the discharge valve (flow rate control valve) Va. Although not explicitly illustrated, there is a predetermined memory in the control unit 50A. The characteristic is that the CCh temperature (or C〇2 pressure) flowing through the line La20 and the temperature of the heat medium sent from the outdoor unit 1 to the bottom side of the ground become a predetermined temperature of the heat medium CO: (hereinafter referred to as "established heat medium" The relationship (quantity) of the quantity "). Further, the control unit 50A has the discharge valves Va and CCh from the time point.

S 24 • 201135166 The valve opening degree of the supply amount adjustment valve Vc is determined as a function of the amount of C〇2 (hereinafter referred to as "C〇2 circulation amount") of the circulation in the piping system 9a at this time point. Further, the control unit 50A has a valve opening degree which compares the c〇2 circulation amount at the time point and the discharge valve Va and the C〇2 supply amount adjustment valve Vc for the predetermined heat medium amount at the time point to determine and discharge. The valves Va and C〇2 supply the function of the valve opening degree of the amount adjustment valve Vc. In the next step S14, the control unit 50A obtains the (1) circulation amount from the valve opening degrees Va and CO in the time point and the valve opening degree of the supply amount adjustment valve Vc, and compares it with the predetermined amount of heat medium to determine whether or not it is appropriate. When the C 〇 2 circulation amount is appropriate (YES in step S14), the valve opening degree of the discharge valve Va and the C 〇 2 supply amount adjustment valve Vc is maintained in the original state (step S 15 5 ) and the process proceeds to step S 18 . If the amount of C 〇 2 circulation is too large (step S14 is "large"), the valve opening degree of the c 〇 2 supply amount adjusting valve Vc is decreased, and/or the valve opening degree of the discharge valve Va is increased (step S16). And it proceeds to step S18. If the C 〇 2 circulation amount is too small ("Small" in step S14), the valve opening degree of the c 〇 2 supply amount adjusting valve Vc is increased and/or the valve opening degree of the discharge valve Va is decreased (step S17). And it proceeds to step S18. In step S18, it is determined whether or not the operation of the system is ended. If the operation of the system is completed (step S 18 is YES), the control is ended. If the operation of the system is continued (step S 1 8 is no), the process returns to step s丨i and is repeated. The other configurations and operational effects of the first modification of Figs. 14 and 15 are the same as those of the first embodiment of Figs. 1 to 13 . Fig. 16 shows a second modification of the first embodiment. e*v -25- 201135166 In the first to fourth figures, the first heat medium line Lb is thermally connected to the indoor unit 2 to thermally connect the air conditioner load as the heat load (the second heat medium line Lc of the air conditioner 3) ). On the other hand, in Fig. 16, the hot water supply load 8 as a heat load is also thermally connected to the first heat medium line Lb. In Fig. 16, a hot water supply load (e.g., water heater 8) is interposed between the four-way valve V4 opening Vp2 connected to the first heat medium line Lb and the line Lb2 of the indoor unit 2 connection port 21. The operation of the greenhouse by the hot water supply by the water heater 8 is the same as that of the first embodiment. Further, although not shown, the air-conditioning load can be omitted and only the hot water load 8 can be supplied. Other configurations and operational effects in the second modification of Fig. 16 are the same as those in the first to fifth embodiments. Further, although not shown, the four-way valve V4 and the lines Lai, La4 and the pump 5 in the ground may be omitted, and the system in which only the greenhouse operation is performed in the first embodiment of Figs. 1 to 15 will be omitted. Even in this case, as shown in the second modification of Fig. 16, it is possible to provide a hot water supply load and an air conditioning load, or to supply only a hot water supply load. Fig. 17 shows a second embodiment. In the first embodiment, only one system is used for the C〇2 pipe for heat exchange heat and heat of vaporization of C〇2 as a heat medium. However, in the second embodiment of Fig. 17, the C〇2 pipe is divided into two systems, and in each system, heat of vaporization and geothermal heat of C〇2 as a heat medium can be exchanged.

S -26- ‘201135166 In Fig. 17, the C〇2 pipe La circulating in the outdoor unit 1 is connected to the double pipe 9C near the surface Gf. A three-way valve V30 is interposed at the lower end of the double pipe 9C. The double pipe 9D, 9D of the same specification is connected to the three-way valve V30. Moreover, the double pipes 9D and 9D of the same specification are respectively buried in the ground. The double tube 9D itself is the same as that shown in Figs. 5 to 13 . Here, in Fig. 17, the diverging pipes 9D, 9D must be separated from each other by at least 1 m so that C 〇 2 flowing through the double pipe 9D has no heat influence with each other, or flows through the double pipe 9D C 〇2 does not exchange heat with each other (C〇2 flowing through the double tube 9D has no thermal interference with each other). According to the second embodiment, the G system of the piping system 9D in the ground is provided with a plurality of systems, so that the geothermal heat can be efficiently recovered or the heat can be efficiently discharged to the ground. The other configurations and operational effects of the second embodiment of Fig. 17 are the same as those of the first embodiment of Figs. 1 to 16. Fig. 18 to Fig. 21 show a third embodiment of the present invention. In Fig. 18, a C〇2 pipe La buried in the ground is connected to a spiral double pipe 9E. In this case, the linear double tube 9C may be interposed, or the piping system La and the spiral double tube 9E may be directly connected. The double pipe 9E as a C〇2 pipe is embedded in the ground in a spiral shape, and the CCh pipe is made of a material having good flexibility. Further, a flexible rod having a drill at the tip (by a so-called "bent boring") is used to spirally control the ground, and a C〇2 pipe (double pipe 9E) is disposed in the rod. After the ground is spirally excavated, the flexible rod body is separated from the drill bit, and the CCh pipe is left in the ground, as long as the flexible body is recovered only on the ground side -27-.201135166. In this case, the drill bit is treated as a so-called "live burying". Alternatively, a shape memory alloy may be used to form a c〇2 pipe (double pipe 9E). In this shape, the memory of the alloy is as shown in Fig. 18 when it reaches the temperature in the ground (about 15 ° C throughout the year). In the spiral shape, a rod body press-fitting device used in a control technology using a flexible rod (so-called "bent boring") is used, and a C〇2 pipe (double pipe) made of a shape memory alloy is used. Press into the ground. According to the third embodiment of the eighteenth embodiment, the piping system 9E of the G in the ground is arranged in a spiral shape. Therefore, the length in the circumferential direction is three times the diameter, and the length of the ground heat exchange can be sufficiently ensured. The digging depth for setting the piping 9E in the ground is reduced to about 1/3 of the previous one. Moreover, the result of reducing the depth of the digging can save the cost of the construction system. Here, the spiral pitch and the diameter are preferably 1 m or more, so that C 〇 2 flowing through the respective portions in the spiral piping system 9E does not exchange heat with each other (flows through the respective portions of the spiral diameter piping system 9E). 〇2 does not affect each other). The other configurations and operational effects of the third embodiment of Fig. 18 are the same as those of the respective embodiments of Figs. 1 to 17 . The drawings from Fig. 21 to Fig. 21 show the order of implementation in the modification of the third embodiment. In the third embodiment of Fig. 18, the piping system 9E is disposed in the ground floor G, but in the modification of the 19th to 21st drawings, the piping system 9E is disposed in the groundwater W. When the modification of Fig. 19 to Fig. 21 is carried out, first, as shown in Fig. 19-28-201135166, the vertical hole GH ° is excavated in the soil G in which the piping system 9E must be disposed, and then, as shown in Fig. 20' In the vertical? A spiral piping system 9E is disposed in the L GH. Here, the pitch and diameter in the spiral piping system 9E are 1 meter or more, and it is preferably as small as possible. Because if the pitch and the diameter are less than 1 meter, the CCh flowing through the various portions of the spiral piping system 9E. The heat exchange (the CCh flowing through the respective portions in the spiral pipe system 9E will be thermally affected), and if the pitch and diameter of the spiral pipe system 9E are large, the diameter and depth of the longitudinal holes GH must be large. After the spiral piping system 9E is disposed in the longitudinal hole GH, as shown in Fig. 21, the vertical hole GH is filled with the ground water W. The temperature of the groundwater W is the same as that of the soil G, and the CCh system flowing through the piping system 9E can exchange heat with the groundwater W in the same place as the geothermal heat. Other configurations and operational effects in the modifications of Figs. 19 to 21 are the same as those in the third embodiment of Fig. 18. Fig. 22 shows a fourth embodiment of the present invention. The fourth embodiment of Fig. 22 corresponds to the combination of the second embodiment of Fig. 17 and the third embodiment of Fig. 18. In Fig. 22, the CCh pipe La circulating in the outdoor unit 1 is connected to the double pipe 9C. Further, a three-way valve V30 is interposed at the lower end of the double pipe 9C.

A double pipe 9D and a spiral double pipe 9E buried in the ground are connected to each other from the three-way valve V30. The configuration of the double pipe 9D is the same as that described in the fifth to thirteenth drawings of the first embodiment, and is the same as the use of the double pipe 9C. Further, the spiral double tube 9E is the same as the screw-shaped double tube 9E of the third embodiment shown in Figs. 18 to 21 . According to the fourth embodiment of Fig. 22, the efficiency of recovering geothermal heat is superior to the respective embodiments of Figs. 17 to 21 . Other configurations and operational effects in the fourth embodiment of Fig. 22 are the same as those of the first to twenty-first embodiments. Fig. 23 shows a fifth embodiment of the present invention. In the embodiment of Fig. 23, with respect to the fourth embodiment of Fig. 22, the double pipes which are different from the three-way valve 3V are spirally doubled pipes 9E ° here, in the closest part, It must be separated by at least 1 meter so that the spiral double pipe (C〇2 pipe) 9E does not interfere with heat. When the fifth embodiment of Fig. 23 is used, the geothermal heat can be recovered more efficiently than the fourth embodiment of Fig. 22. The other configurations and operational effects of the fifth embodiment of Fig. 23 are the same as those of the respective embodiments of Figs. 1 to 22 . Fig. 24 shows a sixth embodiment of the present invention. In the sixth embodiment of Fig. 24, similarly to the fifth embodiment of Fig. 23, the double pipes which are different from the three-way valve 3V are spiral, but a spiral double pipe 9F is arranged in The other outer side of the spiral double tube 9E (same as the double tube 9E of Fig. 23) surrounds the other spiral double tube 9E. Even in this case, at least 1 meter in the radial direction of the spiral double pipe (C〇2 pipe) 9E, 9F is isolated, so that the spiral double pipes (C〇2 pipes) 9E, 9F do not thermally interfere with each other. In addition, in each of the spiral double tubes 9E, 9F, ' must be separated by at least 1 meter in the up and down direction -30-201135166 (the pitch direction of the spiral). When the sixth embodiment of Fig. 24 is used, compared with the fifth embodiment of Fig. 23, the horizontal space for arranging the double pipes 9E and 9F can be reduced, and the buried in the ground can be shortened. The length of the pipe 9F can maintain or increase the heat recovery amount of the geothermal heat. The other configurations and operational effects of the sixth embodiment of Fig. 24 are the same as those of the respective embodiments of Figs. 1 to 23 . In the embodiment shown in the drawings, when the inventors connected a compression air conditioner as a heat load to perform a greenhouse operation, an experiment of comparing the geothermal utilization system of the illustrated embodiment with the geothermal recovery mechanism using the previous brine was carried out. As a result of the experiment, when the outside air temperature is the same, the heat medium using the illustrated embodiment of C〇2 is the closed space of the greenhouse, and the temperature of the space (room) rises. At this time, in the compression type air conditioner connected to the previous geothermal utilization mechanism using the brine as the heat medium, the compressor must be operated 100%. On the other hand, it is sufficient that the compressor in the embodiment shown in the figure in which the CO: is used for the heat medium is operated as long as 50% of the load is operated. Further, the compression type air conditioner connected to the embodiment shown in the drawing has a power consumption of about 1 /2 as compared with the case where it is connected to the previous geothermal utilization equipment. In this experiment, in the embodiment shown in the figure, in the same manner as the second embodiment of Fig. 17, the tube having a "tube diameter of one inch and a half" is divided into two systems to recover the geothermal heat to carry out the greenhouse. Moreover, in the prior art, the so-called "three-inch pipe" pipe was buried in the ground as a system to recover geothermal heat. In this experiment, the difference between the illustrated embodiment and the prior art greenhouse capacity was known. -31 - 201135166 In other words, in the illustrated embodiment, even if the c〇2 pipe buried in the ground uses a small diameter 'compared with the prior art using the thick piping system, it is known that there is no meaningful difference in the capacity of the greenhouse. . If the piping in the ground can be used with a small diameter, the cost of the excavation and other various costs can be reduced when the piping is buried in the ground. Therefore, compared with the prior art, it can be seen that the illustrated embodiment can reduce various costs. The illustrated embodiments are merely illustrative, and are not intended to limit the scope of the technical scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing a first embodiment of the present invention. Fig. 2 is a flow chart showing the switching of the cold room and the warm room in the first embodiment. Fig. 3 is a view showing the flow of the heat medium during the operation of the greenhouse in Fig. 1. Fig. 4 is a view showing the flow of the heat medium during the operation of the cold room in Fig. 1. Fig. 5 is a partial cross-sectional view showing the flow of the heat medium during operation of the greenhouse when the piping in the underground is a double pipe. Fig. 6 is a partial cross-sectional view showing the flow of the heat medium during operation of the cold room when the piping in the underground is a double pipe. Figure 7 is a block diagram showing the construction of the lower end of the double pipe. Fig. 8 is a view showing the plane when the greenhouse is operated in Fig. 7. Fig. 9 is a block diagram showing the upper end of the double pipe in Fig. 7 showing the drawing of the cold room during operation. Fig. 11 is a block diagram showing a modification of the upper end portion of the double pipe. -32-.201135166 Fig. 12 is a cross-sectional view showing a first modification of the double pipe. Fig. 13 is a longitudinal sectional view showing a second modification of the double pipe. Fig. 14 is a block diagram showing important parts of the first modification of the first embodiment. Fig. 15 is a flow chart showing the control in the first modification of Fig. 14. Fig. 16 is a view showing a second modification of the first embodiment. Fig. 17 is a block diagram showing important parts of the second embodiment of the present invention. Fig. 18 is a block diagram showing an important part of a third embodiment of the present invention. Fig. 19 is a block diagram showing the order of execution of the modification of the third embodiment. Figure 20 is a block diagram showing the sequence of execution of the continuous ninth diagram. Fig. 2 is a block diagram showing the order of execution of the continuation of Fig. 20. Figure 22 is a block diagram showing an important part of a fourth embodiment of the present invention. Figure 23 is a block diagram showing an important part of a fifth embodiment of the present invention. Figure 24 is a block diagram showing an important part of the sixth embodiment of the present invention.

S -33- 201135166 [Description of main components] 1 Outdoor unit 2 Indoor unit 3 Air conditioner 4 Compressor 5 Pump 9 Double tube 40 Pressure detector 50 Control unit 91 Inner tube 92 Outer tube 100 Geothermal utilization system 11, 12,13,21,22,23,24,31,32 connection port lh, 2h heat exchange unit 4 〇 vent outlet 50A control unit 5i suction port 5 ο discharge port 6, 7 temperature detector 91 A, 91B inner tube 92A, 92B Outer tube 9 a Piping system 9A, 9B Double tube 9C, 9D, 9E, 9F Double valve 9D, 9E, 9F Piping system B 1 , B2 Bifurcation point 34- 201135166 Β a 2, Β a 3 Bifurcation point G Ground G Gf Surface GH Longitudinal hole La,9 Piping system Lai, La2, La3, La4, La5 Line La20, La30 Line La9 Underground piping system Lb First heat medium line Lbl, Lb2, Lb3, Lb4, Lb5 Lc 2nd heat medium line Lc C02 supply line L c 1 , L c 2 Line Pa2, Pa3 So connection control signal line V 1 , V2 switching valve V3 pressure reducing valve V30 three-way valve V4 four-way valve Va discharge valve Val switch Valve Vc Co2 supply quantity regulating valve Vpl, Vp2, Vp3, Vp4 opening W Groundwater-35-

Claims (1)

.201135166 VII. Patent application scope: 1. A geothermal utilization system, which has a piping system embedded in the ground to form a compression type air conditioner in which the piping is interposed and exchanged with the geothermal heat. The heat exchanger, the former is carbon dioxide, the heat of vaporization of carbon dioxide and the geothermal heat exchange, the pipe system is composed of a double pipe, and the carbon dioxide flowing through the inner pipe of the liquid phase flows through the outer pipe, in order to heat the carbon dioxide. The exchange, the field of the heat exchanger in the piping system is set to be 0 to 15 ° C when the greenhouse operation is performed, and 1 5 to 30 ° C when the cold room is implemented. 2 · The geothermal utilization system of claim 1 of the patent scope, wherein the piping system is divided into a plurality of systems in the ground. 3. The geothermal system according to any one of the first or the second aspect of the patent application, wherein The piping is arranged in a spiral shape in the ground. , the function, the heat medium, the above-mentioned distribution, the gas phase and the geothermal temperature are operated, the aforementioned utilization system -36-