JP2014098535A - Air conditioning system for building utilizing geothermal heat and heat pump - Google Patents

Abstract

To provide a building air conditioning system using geothermal heat and a heat pump that can reduce the number of days related to the undergrounding work of a heat transfer fluid storage pipe for underground heat collection and can be constructed at low cost.
A heat transfer fluid is circulated between a first heat exchanging portion 11 of a heat pump system 6 and a heat transfer fluid storage pipe 16 for use of underground heat, and the heat transfer fluid is A circulation pump 22 that circulates between the first heat exchanging section 11 and the heat transfer fluid storage pipe 16 is provided, and the heat transfer fluid storage pipe 16 is positioned directly below the solid foundation 2 of the building 3 to be grounded. The surface 1a is embedded in a shallow position in the horizontal direction.
[Selection] Figure 1

Description

  The present invention relates to underground heat used for air conditioning in a building by exchanging heat with underground heat pump and an air conditioning system for buildings using a heat pump.

  Conventionally, as an air conditioning system for buildings, a heat pump for air-conditioning the interior of the building, a heat collecting pile buried in the ground, an antifreeze liquid provided through a heat exchanger of the heat pump and the heat collecting pile Pipes, antifreeze filled in antifreeze liquid pipes, and pumps for circulating antifreeze liquids in antifreeze liquid pipes, for buildings using heat pumps that use geothermal heat to exchange heat between the ground and indoor air by circulation An air conditioning system is known (see, for example, Patent Document 1).

JP 2012-47360 A

  However, in this building air conditioning system, a number of pile insertion holes are formed in the ground with a boring machine, and a hollow heat-collecting pile is inserted and buried in this pile insertion hole, so a pile insertion hole is formed in the ground. As a result, many days are involved in the work of burying the heat collection pile in the pile insertion hole, and the cost is high.

  Accordingly, the present invention provides an air conditioning system for buildings using geothermal heat and a heat pump that can reduce the number of days related to the undergrounding work of the heat transfer fluid storage pipe for underground heat collection and can be built at low cost. It is intended to do.

  In order to achieve this object, the present invention comprises a foundation provided in a flat plate shape on the ground and a building is constructed on the upper part thereof, and an underground heat exchanging means buried below the foundation and buried in the ground. The heat pump that uses the heat of the refrigerant heat-exchanged in the first heat exchanging unit for air conditioning in the building in the second heat exchanging unit, and between the first heat exchanging unit and the underground heat exchanging means A circulation pipe connected to the first heat exchanging unit and the underground heat exchanging means so as to be able to circulate the heat transfer fluid, and the first heat exchanging unit via the circulation pipe. And a ground pump for circulating heat between the ground heat exchanging means and a ground heat and heat pump building air conditioning system, wherein the ground heat exchanging means is located directly below the foundation from the ground surface. Heat transfer fluid storage pie buried horizontally in a shallow position And characterized in that.

  According to this configuration, it is possible to reduce the number of days related to the operation of burying the heat transfer fluid storage pipe for underground heat collection into the ground, and it can be constructed at low cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic explanatory diagram of a building air conditioning system using ground heat and a heat pump according to a first embodiment of the present invention. It is a piping system diagram of the building air conditioning system using the underground heat and heat pump shown in FIG. It is an expanded sectional view of the heat carrier fluid storage pipe of FIG. It is explanatory drawing which shows the other example of the heat conveyance fluid storage pipe of FIG. It is explanatory drawing of Example 2 which shows the further another example of the heat conveyance fluid storage pipe of FIG. It is a schematic explanatory drawing which shows the other example of the building air-conditioning system using geothermal heat and heat pump concerning this invention. It is a schematic explanatory drawing of Example 3 which shows the further another example of the building air conditioning system using the geothermal heat and heat pump which concerns on this invention. It is a piping system diagram of the building air conditioning system using the underground heat and heat pump of FIG. It is a schematic explanatory drawing of the building air-conditioning system using the ground heat and heat pump of Example 4 which concerns on this invention. It is explanatory drawing of the heat conveyance fluid storage pipe shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Constitution]
In FIG. 1, a solid foundation 2 is provided on the ground 1 as a flat foundation. Here, the ground 1 includes the ground surface 1a and the ground (underground part) 1b below the ground surface 1a.

  The solid foundation 2 includes a bottom plate 2a and a rising portion 2b that is integrally formed around the bottom plate 2a. A building 3 such as a house is constructed on the rising portion 2b by installing the peripheral edge of the floor 3a of the building 3 on the rising portion 2b.

  An underfloor space 4 is formed between the floor 3 a of the building 3 and the bottom plate 2 a of the solid foundation 2. In the underfloor space 4, a foundation heat insulating member 5 is disposed along the peripheral edge of the solid foundation 2. The basic heat insulating member 5 has a side surface portion 5a fixed to the inner surface of the rising portion 2b, and a bottom surface portion 5b provided on the bottom plate 2a and connected to the lower end portion of the side surface portion 5a. For this basic heat insulating member 5, glass wool, urethane foam, polystyrene foam or the like is used.

  Furthermore, a heat pump system 6 is disposed in the underfloor space 4. As shown in FIG. 1, the heat pump system (heat pump) 6 includes a heat pump unit 7 and an underfloor radiator 8 installed on the bottom plate 2 a of the solid foundation 2, and a first connecting the heat pump unit 7 and the underfloor radiator 8. 1 and 2nd connection pipes 9 and 10 are provided. As shown in FIG. 2, the underfloor radiator 8 includes a condenser (heat radiating portion) 8a and a blower fan 8b that blows air to the condenser 8a. In the first and second connection pipes 9 and 10, a refrigerant flow path for circulating the refrigerant from the heat pump unit 7 to the underfloor radiator 8 is formed.

  As shown in FIG. 2, the heat pump unit 7 includes a first heat exchange unit (primary side heat exchange unit) 11. The first heat exchange unit 11 includes an evaporator 11a and a heat exchange container 11b that accommodates the evaporator 11a.

  Further, the heat pump unit 7 includes first and second refrigerant flow paths 12 and 13 connected to both ends of the evaporator 11a, a compressor 14 interposed in the middle of the first refrigerant flow path 12, and a second refrigerant flow. An expansion valve 15 interposed in the middle of the passage 13 is provided. In addition, the 1st, 2nd refrigerant flow paths 12 and 13 are formed from the some pipe.

  The condenser 8 a of the underfloor radiator 8 is connected to the first and second refrigerant flow paths 12 and 13 via the first and second connection pipes 9 and 10 described above. Thus, the first and second connection pipes 9 and 10, the evaporator 11a, the first and second refrigerant flow paths 12 and 13, the compressor 14, the expansion valve 15, the condenser 8a and the like form a series of refrigerant ring flow paths. ing.

  The compressor 14 compresses the gaseous refrigerant from the evaporator 11a and supplies it to the condenser 8a, and the expansion valve 15 expands the refrigerant that has been radiated and liquefied by the condenser 8a and supplies it to the evaporator 11a. It is arranged.

  In FIG. 1, a heat transfer fluid storage pipe 16 is horizontally embedded in the underground 1 b so as to be positioned directly below the bottom plate 2 a of the solid foundation 2. The heat transfer fluid storage pipe 16 is disposed at a position close to the bottom plate 2a. For example, an inexpensive vinyl chloride resin pipe is used as the heat transfer fluid storage pipe 16, but it is not always necessary to use a vinyl chloride resin pipe.

  For example, a backhoe is used to embed the heat transfer fluid storage pipe 16 in the underground 1b. This backhoe is a construction machine in which a shovel (bucket) is attached to the operator side among the construction machines collectively referred to as a hydraulic excavator. It has become. This backhoe is suitable for excavation at a place lower than the ground surface 1a.

  Also, the backhoe is used to dig the ground 1 during foundation work for the solid foundation 2 and heats up to the width and depth that can be dug by the backhoe in the recess of the ground 1 dug during the foundation work. The carrier fluid storage pipe 16 is embedded.

Here, assuming that the groove for burying the heat transfer fluid storage pipe 16 is buried, the upper and lower construction conditions for burying the pipe 16 are set as follows, for example.
<Upper limit of depth of pipe burial groove>
(A). When the heat transfer fluid storage pipe 16 is buried in the ground, the heat transfer is performed so that the position at a depth of 10 cm from the lower end of the foundation crushed stone (not shown) of the solid foundation 2 becomes the upper end of the heat transfer fluid storage pipe 16. It is necessary to set the depth of the groove for burying the fluid storage pipe 16. That is, a covering soil having a covering thickness of about 10 cm is required on the upper part of the heat transfer fluid storage pipe 16.
(B). Further, a pipe foundation of about 10 cm is provided under the heat transfer fluid storage pipe 16.

  Therefore, for example, when the diameter D of the heat transfer fluid storage pipe 16 is 15 cm, the upper limit of the excavation depth of the pipe burying groove dug by the backhoe is 35 cm (diameter 15 cm + tube foundation 10 cm + covering thickness (covering thickness) 10 cm). = 35 cm).

The upper limit of the depth of the pipe burying groove dug by such a backhoe is an example, and is not necessarily limited to the above-described numerical values. For example, when the construction condition of the pipe foundation + cover thickness changes according to the diameter D of the heat transfer fluid storage pipe 16, the upper limit of the depth of the pipe burying groove changes according to the diameter D, the pipe foundation, and the cover thickness.
<Lower limit of depth of pipe burial groove>
In addition, for example, when it is necessary to provide earth retaining for the building 3, the lower limit of the excavation depth dug by the backhoe (yumbo) is, for example, 1.1 m (tube foundation 10 cm + tube diameter 15 cm + tube upper portion 85 cm).

  The depth of the pipe burying groove dug by such a backhoe is an example, and is not necessarily limited to this value.

  Considering the backhoe used in the foundation construction in this way, if the heat carrier fluid storage pipe 16 is embedded in a width and depth that can be dug by the backhoe, it can be constructed at low cost. Since a general backhoe has a bucket width of 550 mm, the width necessary for the backfilling operation is a portion formed on the left and right sides of the heat transfer fluid storage pipe 16. The diameter D of the heat transfer fluid storage pipe 16 may be set so that the width required for this backfilling operation is, for example, about 150 to 200 mm, or about 200 mm to 300 mm.

  Therefore, when the floor area of the floor 3a of the building 3 is about 8 m × 8 m, for example, the heat transfer fluid storage pipe 16 having the following specifications may be used. That is, for the heat transfer fluid storage pipe 16, for example, a pipe having a diameter D of 150 to 250 φ and a length L of about 20 to 40 m may be used. In addition, this numerical value shows an example and is not limited to this.

  As shown in FIG. 3, the heat transfer fluid storage pipe 16 includes a large-diameter pipe body 17 and cap-shaped lids 18 and 19 that respectively close both ends of the pipe body 17. Small-diameter connecting pipe portions 18a and 19a are integrally formed at the central portions of the lids 18 and 19 so as to protrude outward.

  Then, as shown in FIGS. 2 and 3, one end portions of the circulation pipes 20 and 21 are airtightly connected to the connection pipe portions 18a and 19a, respectively. The other end portions of the circulation pipes 20 and 21 are connected to the heat exchange vessel 11b of the first heat exchange unit 11 as shown in FIG. A circulation pump 22 is interposed in the middle of the circulation pipe 20. The heat exchange container 11b, the heat transfer fluid storage pipe 16, and the circulation pipes 20 and 21 are filled with antifreeze as a heat transfer fluid.

  The circulation pipes 20 and 21 generally have a diameter d of, for example, 20 mm if the hot water system of the heat pump with floor heating is replaced with a heat collection application. Therefore, the diameter D of the heat transfer fluid storage pipe 16 described above is 15 to 25 times the diameter d of the circulation pipes 20 and 21. Here, the heat pump with floor heating refers to a configuration in which a pipe (not shown) is laid on the floor portion 3a and hot water heated by the heat pump unit 7 is circulated through the pipe. By heating the floor portion 3a, the indoor air on the floor portion 3a can be heated.

  Further, as shown in FIG. 2, the blower fan 8b, the compressor 14, and the circulation pump 22 of the underfloor radiator 8 are controlled by a control circuit 23 as a control means (control unit).

[Action]
Next, the operation of the building air conditioning system using the geothermal heat and heat pump having such a configuration will be described.
In such a configuration, when the floor 3a and the building 3 are heated, the blower fan 8b, the compressor 14, and the circulation pump 22 are driven and controlled by the control circuit 23 in winter. Along with this, the circulation pump 22 circulates the antifreeze liquid between the heat transfer fluid storage pipe 16 and the heat exchange container 11 b of the first heat exchange unit 11 via the circulation pipes 20 and 21. The compressor 14 compresses the refrigerant from the evaporator 11a and circulates the condenser 8a, the expansion valve 15, and the evaporator 11a in this order.

  As the refrigerant circulates, heat is exchanged between the underground heat from the antifreeze liquid in the heat transfer fluid storage pipe 16 circulated by the circulation pump 22 and the refrigerant in the evaporator 11a in the heat exchange vessel 11b. The refrigerant in the evaporator 11a is heated and the temperature rises.

  The refrigerant whose temperature has risen is further heated by being compressed by the compressor 14, and becomes a high-temperature and high-pressure refrigerant. The compression-heated refrigerant is supplied to the condenser 8a that is the second heat exchange unit.

  At this time, the blower fan 8b of the underfloor radiator 8 is driven. Accordingly, the air blown by the blower fan 8b flows around the condenser 8a and is heated and blown into the underfloor space 4 to heat the underfloor space 4. Thereby, the floor 3a is heated. In addition, when the louver (not shown) for air conditioning is provided in the floor part 3a, the air | conditioned air in the underfloor space 4 is supplied in the building 3 via a louver, and the inside of the building 3 Can be heated.

  As described above, the heat pump system, that is, the building air conditioning system using the underground heat and the heat pump is an underfloor air conditioning system, and is an underground pipe (heat transfer fluid storage pipe) embedded in the heat source of the heat pump unit 7. 16) Using the antifreeze liquid as the circulating liquid in the inside, the antifreeze liquid circulates between the underground pipe (heat transfer fluid storage pipe 16) and the first heat exchange unit 11 of the heat pump unit 7. Moreover, the underground pipe (heat transfer fluid storage pipe 16) is buried under the foundation (solid foundation 2) of the house that has been thermally insulated. In addition, an inexpensive PVC pipe is used as a general member for the underground pipe (heat transfer fluid storage pipe 16). This underground pipe (heat carrier fluid storage pipe 16) does not stick to the material and shape as long as the circulating liquid (antifreeze) can be held without leaking. However, if the material and shape of the underground pipe (heat transfer fluid storage pipe 16) is a pipe made of vinyl chloride, the length of the buried pipe can be adjusted according to the capacity of the heat pump unit 7 to construct a building (house ) Can cope with 3 heating / cooling loads.

In this way, a buried underground pipe (heat transfer fluid storage pipe 16) is horizontally buried directly below the foundation (solid foundation 2) in the vicinity of the foundation (solid foundation 2) of the building (house) 3. By using a heat pump system in which the buried pipe (heat transfer fluid storage pipe 16) is the primary heat source, in addition to being able to use the underground heat, it is also possible to use the heat that escapes under the housing foundation (solid foundation 2). Thereby, it is possible to stably operate with high efficiency irrespective of the outside air condition that affects the capacity and efficiency of the heat pump unit 7. Moreover, it becomes a primary side heat source cheaper than the underground pile of a general underground heat pump system.
In addition, the area directly under the foundation (solid foundation 2) of the building (house) 3 is not easily affected by the outside air temperature, so that the underground underground pipe (heat transfer fluid storage pipe 16) does not generate ground heat even if it is shallow. Easy to absorb. For this reason, in order to make it easy to embed the underground pipe (heat transfer fluid storage pipe 16) in the underground 1b, the underground pipe (heat transfer fluid storage pipe 16) is placed at a shallow position from the ground surface 1a. Even if buried, the thermal energy efficiency of the use of underground heat can be increased.

(Modification 1)
Moreover, in Example 1, although the case where the heat conveyance fluid storage pipe 16 was one was shown, it is not necessarily limited to this. For example, as shown in FIG. 4, a plurality of heat transfer fluid storage pipes 16 may be arranged in parallel, and the plurality of heat transfer fluid storage pipes 16 may be connected by connection pipes 24.

  Further, as shown in FIG. 5, a plurality of heat transfer fluid storage pipes 16 are arranged in parallel, and the plurality of heat transfer fluid storage pipes 16 are connected by connection pipes 25 having an arc shape or a U shape. It is good also as a structure. The diameter of the connection pipe 25 may be either a value that fits to the outer peripheral surface of the heat transfer fluid storage pipe 16 or a value that fits to the inner peripheral surface of the heat transfer fluid storage pipe 16.

(Example 2)
FIG. 6 is a schematic explanatory view showing a second embodiment of a building air-conditioning system using geothermal heat and heat pump according to the present invention, and FIG. 7 is a piping diagram of the building air-conditioning system using geothermal heat and heat pump of FIG. It is.

  In the second embodiment, the heat pump unit 7 using the ground heat of the heat pump system (heat pump) 6 of FIG. 1 is installed as an outdoor unit outside the building 3 as shown in FIG. 6, and the heat pump unit 7a using the outside air is installed in the building. The outdoor unit 3 is installed as an outdoor unit so that the more efficient of the outside air and the underground heat is used. Since the configuration of the heat pump unit 7a is the same as that of the heat pump unit 7, detailed illustration and description of the piping are omitted. Further, the heat pump unit 7a is connected to the condenser (heat radiating portion) 8a of the underfloor radiator 8 in FIG.

  In this embodiment, the control circuit 23 turns ON / OFF the compressor 14 and the circulation pump 22 of the heat pump unit 7 and ON / OFF of the underfloor radiator 8 (ON / OFF of the blower fan 8b) as in FIG. It has become. In addition, the control circuit 23 performs ON / OFF control of a blower fan (not shown) of the underfloor radiator 8.

  In addition, an outside air temperature signal from the outside air temperature sensor 26, an indoor temperature signal from the indoor temperature sensor 27, and a ground temperature signal from the ground heat temperature sensor 28 are input to the control circuit 23. The outside air temperature sensor 26 is provided outside the building 3, and the indoor temperature sensor 27 is provided in a room in the building 3. The underground heat temperature sensor 28 is provided in the heat transfer fluid storage pipe 16 or on the outer surface thereof so that the temperature in the heat transfer fluid storage pipe 16 can be detected.

  In such a configuration, the control circuit 23 obtains the outside air temperature from the outside air temperature signal from the outside air temperature sensor 26, obtains the room temperature from the room temperature signal from the room temperature sensor 27, and subsurface from the underground heat temperature sensor 28. The temperature in the heat transfer fluid storage pipe 16 is obtained from the temperature signal as the underground heat temperature.

  In winter, the control circuit 23 calculates the heat pump unit from the outside air temperature obtained by the outside air temperature sensor 26, the room temperature obtained by the room temperature sensor 27, the underground heat temperature obtained by the underground heat temperature sensor 28, and the like. 7 and 7a are selected and operated to be more efficient for heating the room in the building 3, and the under-floor radiator 8 is turned ON / OFF (the blower fan 8b is turned ON / OFF).

(Example 3)
FIG. 7 shows a third embodiment of a building air-conditioning system using geothermal heat and heat pump according to the present invention, and FIG. 8 is an explanatory diagram showing piping of the building air-conditioning system using geothermal heat and heat pump of FIG. is there.

  In the third embodiment, in the configuration of the first embodiment, the solar heat collecting device 30 is further installed on the roof 3b of the building 3 as shown in FIG. 7, and the solar heat collecting device 30 collects heat during the daytime in winter. The antifreeze in the heat transfer fluid storage pipe 16 thus heated is warmed, and the antifreeze in the heat transfer fluid storage pipe 16 heated by the solar heat is circulated to the heat pump system 6 at night in winter to perform heating similar to that in the first embodiment. It is what I do.

  In the third embodiment, as shown in FIGS. 7 and 8, one end portions of the circulation pipes 31 and 32 are connected to the solar heat collecting device 30, and the circulation pump 22 and the heat exchange vessel 11b are connected to each other as shown in FIG. The flow path switching valve 33 is connected to the circulation pipe 20 so as to be positioned between them. In addition, as shown in FIG. 8, the other end of the circulation pipe 31 is connected to the circulation pipe 20 via the flow path switching valve 33, and the other end of the circulation pipe 32 is connected to the circulation pipe 21. An electromagnetic switching valve is used as the flow path switching valve 33.

  The flow path switching valve 33 communicates the circulation pump 22 and the circulation pipe 31 and blocks the communication between the circulation pump 22 and the heat exchange container 11b of the first heat exchange section 11 (not shown). And a second flow path switching position (not shown) that cuts off the communication between the circulation pump 22 and the circulation pipe 31 and allows the circulation pump 22 and the heat exchange container 11b of the first heat exchange unit 11 to communicate with each other. . The first flow path switching position is a heating mode switching position in which the antifreeze liquid (heat carrier fluid) in the heat carrier fluid storage pipe 16 is heated by the heat collected by the solar heat collector 30. Further, the second flow path switching position is a switching position of a heat storage utilization mode in which the antifreeze liquid (heat carrier fluid) in the heat carrier fluid storage pipe 16 is used for the heat pump system 6.

  In addition, the control circuit 23 receives a heat collection temperature detection signal from a heat collection temperature detection sensor 34 provided in the solar heat collector 30, and receives a ground heat temperature detection signal from the geothermal heat temperature detection sensor 34. It is designed to be entered. In addition, the control circuit 23 collects heat by the solar heat collector 30 based on the heat collection temperature detection signal from the heat collection temperature detection sensor 34 and the underground heat temperature detection signal from the underground heat temperature detection sensor 35. When it is determined that the heat collection temperature is higher than the underground heat temperature, the flow path switching valve 33 is switched to the first flow path switching position in the heating mode.

  The control circuit 23 communicates the circulation pipe 31 with the circulation pump 22 through the flow path switching valve 33 when the collected heat temperature collected by the solar heat collecting device 30 is higher than the underground heat temperature during the daytime in winter. Then, the communication between the circulation pump 22 and the heat exchange container 11b is blocked by the flow path switching valve 33 and the circulation pump 22 is driven, so that the circulation pipe 20, 21, 31, 32 and the flow path switching valve 33 are connected. The antifreeze liquid is circulated between the solar heat collecting device 30 and the heat transfer fluid storage pipe 16 to heat the antifreeze liquid in the heat transfer fluid storage pipe 16, and solar heat is stored in the antifreeze liquid in the heat transfer fluid storage pipe 16.

  On the other hand, the control circuit 23 cuts off the communication between the circulation pipe 31 and the circulation pump 22 with the flow path switching valve 33 at night in winter, and causes the circulation pump 22 and the heat exchange container 11b to communicate with each other with the flow path switching valve 33. In this state, the control circuit 23 drives and controls the blower fan 8b, the compressor 14, and the circulation pump 22. Thereby, the antifreeze liquid is circulated between the heat transfer fluid storage pipe 16 and the heat exchange container 11b by the circulation pump 22, and the refrigerant in the evaporator 11a of the first heat exchange unit 11 is warmed by solar heat to It is heated by the heat of the antifreeze liquid in the heat transfer fluid storage pipe 16 having a temperature higher than the intermediate heat. The heated and warmed refrigerant is supplied to the condenser 8a after being expanded through the expansion valve 15, and warms the air blown around the condenser 8a by the blower fan 8b. The warmed air is blown into the underfloor space 4 to heat the underfloor space 4.

  The control circuit 23 is provided with a timer setting function, and the daytime and nighttime settings in winter are set in the control circuit 23 using the timer setting function, so that the control circuit 23 can be used for daytime and nighttime. It is advisable to execute such control.

  In this way, since the underground pipe (heat transfer fluid storage pipe 16) is connected to a heat source such as the solar heat collector 30, heat is collected by the solar heat collector during the winter day, and the underground pipe is collected. The circulating fluid (antifreeze) in the (heat carrier fluid storage pipe 16) can be kept warm, and highly efficient heating can be performed at night in winter. The heat source may be an electric heater, a boiler, or the like, but by using natural energy such as solar heat or waste heat, an economical and environmentally superior system can be obtained.

  In the third embodiment, the heat collecting temperature and the underground heat temperature of the solar heat collecting device 30 are detected to control the first and second flow path switching positions. However, this temperature detection is always necessary. is not. The first and second flow path switching positions may be controlled only by daytime and nighttime control set by the timer setting function described above.

(Modification 2)
In the third embodiment, the switching control of the first and second channel switching positions is performed by the channel switching valve 33, but the present invention is not necessarily limited to this. For example, without providing the flow path switching valve 33, the solar heat collecting device 30 and the heat transfer fluid storage pipe 16 are directly connected by the circulation pipes 31 and 32, and a circulation pump (not shown) is connected to one of the circulation pipes 31 and 32. ), The circulation pump (not shown) is operated during the daytime, and the circulation pump 22 is operated at night.

(Example 4)
FIG. 9 is a schematic explanatory diagram of a building air conditioning system using geothermal heat and a heat pump according to a fourth embodiment of the present invention. FIG. 10 is an explanatory diagram of the heat transfer fluid storage pipe shown in FIG.
In the fourth embodiment, the heat pump unit 7 of FIG. 1 is installed outside the building 3 as shown in FIG. 9 as an outdoor unit. In the fourth embodiment, the heat transfer fluid storage pipe 16 ′ shown in FIG. 10 is used instead of the heat transfer fluid storage pipe 16. This heat transfer fluid storage pipe 16 ′ is formed by meandering a vinyl chloride pipe having a diameter of 20 mm so as to correspond to the entire range of the solid foundation 2. The circulation pump 22 can also be incorporated in the heat pump unit 7.
Since the configuration other than the arrangement of the heat pump unit 7 and the shape of the meandering heat transfer fluid storage pipe is the same as that of the first embodiment, the description thereof is omitted.
According to this configuration, it is possible to effectively use the underground heat just below the entire range of the solid foundation 2.

(Operations and effects of the embodiment of the invention)
(1). As described above, the building air-conditioning system using the underground heat and heat pump according to the embodiment of the present invention is provided with a flat plate shape on the ground 1 and the building 3 is constructed on the top (solid foundation 2). And an underground heat exchanging means buried below the foundation (solid foundation 2). In addition, the building air conditioning system using the underground heat and the heat pump uses heat from the refrigerant exchanged in the first heat exchange unit 11 in the building 3 in the second heat exchange unit (underfloor radiator 8). A heat pump (heat pump system 6) used for air conditioning is provided. Furthermore, the building air conditioning system using geothermal heat and a heat pump is capable of circulating the heat transfer fluid between the first heat exchanging unit 11 and the underground heat exchanging means. And circulation pipes 20, 21 connected to the underground heat exchange means, and the heat transfer fluid between the first heat exchange section 11 and the underground heat exchange means via the circulation pipes 20, 21. And a circulation pump 22 that circulates between them. Moreover, the underground heat exchanging means is a heat transfer fluid storage pipe 16 that is located directly below the foundation (solid foundation 2) and is buried in a horizontal direction from a ground surface 1a to a shallow position.
According to this configuration, it is possible to reduce the number of days related to the operation of burying the heat transfer fluid storage pipe 16 for underground heat collection into the ground, and it can be constructed at low cost.

(1). In the building air conditioning system using the geothermal heat and heat pump according to the embodiment of the present invention, the diameter D of the heat transfer fluid storage pipe 16 is formed larger than the diameter d of the circulation pipes 20 and 21. When the amount of the heat transfer fluid that can use the underground heat according to the air conditioning capability of the heat pump system 6 (the antifreeze liquid that is the circulating fluid) is the amount of the underground heat use fluid storage amount, the heat transfer fluid storage pipe 16 The length L and the diameter D are set to a diameter and a length that can secure a volume capable of storing the heat transfer fluid of the underground heat utilization fluid storage amount.
According to this configuration, the heat pump system 6 having an air conditioning capability (heating capability) according to the area of the floor 3a of the building 3 and the volume of the underfloor space 4 can be employed. Moreover, when carrying out the foundation work at the construction site of the building 3, the heat transfer fluid storage pipe 16 having a diameter and a length capable of storing the heat transfer fluid of the underground heat utilization fluid storage amount according to the air conditioning capability of the heat pump system 6. The underground can be used according to the air-conditioning capability (heating) of the heat pump system 6 used in the building 3 only by placing the heat transfer fluid storage pipe 16 close to the ground surface and burying it horizontally in the ground. Thermal energy can be sufficiently secured with a simple configuration.

(1). Further, in the building air conditioning system using the geothermal heat and heat pump according to the embodiment of the present invention, a solar heat collecting device 30 is provided in the building 3, and the solar heat collecting device 30 and the heat transfer fluid storage pipe 16 circulate. The solar heat collecting device 30 is connected to the pipes 31 and 32 and is capable of storing heat by heating the heat carrying fluid in the heat carrying fluid storage pipe 16 with the heat collected by the solar heat collecting device 30. A circulation pump (circulation pump 22 of the third embodiment or a circulation pump (not shown) of the second modification) that circulates the heat transfer fluid between the heat transfer fluid storage pipe 16 and the heat transfer fluid storage pipe 16 is provided.

  Thus, since the heat transfer fluid storage pipe 16 is connected to a heat source such as the solar heat collector 30, heat collection is performed by the solar heat collector during the winter day, and the heat transfer fluid storage pipe 16 circulates in the heat transfer fluid storage pipe 16. Liquid (antifreeze) can be kept warm, and high-efficiency heating can be performed at night in winter.

1 ground 1a ground surface 2 solid foundation (foundation)
3 Building 6 Heat pump system (heat pump)
8 Underfloor radiator (second heat exchanger)
DESCRIPTION OF SYMBOLS 11 1st heat exchange part 16 Heat transfer fluid storage pipe 16 'Heat transfer fluid storage pipe 20 Circulation pipe 21 Circulation pipe 22 Circulation pump 30 Solar thermal collector 31 Circulation pipe 32 Circulation pipe d Diameter (diameter of circulation pipe)
L length (length of fluid storage pipe)
D Diameter (diameter of fluid storage pipe)

Claims (3)

A foundation which is provided in a flat plate shape on the ground and a building is constructed at the top;
Underground heat exchange means buried below the foundation,
A heat pump that uses the heat of the refrigerant that is heat-exchanged in the first heat exchange unit for air conditioning in the building in the second heat exchange unit;
A circulation pipe connected to the first heat exchanging unit and the underground heat exchanging means so that a heat transfer fluid can be circulated between the first heat exchanging unit and the underground heat exchanging unit;
In a building air conditioning system using ground heat and a heat pump, comprising: a circulation pump that circulates the heat transfer fluid between the first heat exchange unit and the underground heat exchange means via the circulation pipe ,
The underground heat exchanging means is a heat transfer fluid storage pipe that is located directly below the foundation and is buried in a horizontal direction in a shallow position from the ground surface. Air conditioning system.   The building air conditioning system using geothermal heat and heat pump according to claim 1, wherein a diameter of the heat transfer fluid storage pipe is formed larger than a diameter of the circulation pipe and depends on an air conditioning capability of the heat pump system. When the amount of the heat transfer fluid that can use the underground heat is defined as the ground heat utilization fluid storage amount, the length and diameter of the heat transfer fluid storage pipe is the heat transfer fluid of the ground heat utilization fluid storage amount. An air conditioning system for buildings using geothermal and heat pumps, characterized in that a diameter and a length capable of securing a storable volume are set.   In the building air-conditioning system using geothermal heat and heat pump according to claim 1 or 2, a solar heat collector is provided in the building, and the solar heat collector and the fluid storage pipe are connected by a circulation pipe. Heat transfer between the solar heat collector and the heat transfer fluid storage pipe so that the heat transfer fluid in the heat transfer fluid storage pipe is heated by the heat collected by the solar heat collector and can be stored. A building air conditioning system using geothermal and heat pumps, characterized in that a circulation pump for circulating fluid is provided.