WO2009133708A1 - Echangeur de chaleur et système de conditionnement d’air - Google Patents

Echangeur de chaleur et système de conditionnement d’air Download PDF

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Publication number
WO2009133708A1
WO2009133708A1 PCT/JP2009/001967 JP2009001967W WO2009133708A1 WO 2009133708 A1 WO2009133708 A1 WO 2009133708A1 JP 2009001967 W JP2009001967 W JP 2009001967W WO 2009133708 A1 WO2009133708 A1 WO 2009133708A1
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WIPO (PCT)
Prior art keywords
heat
heat transfer
heat exchanger
cooling
tube
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PCT/JP2009/001967
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English (en)
Japanese (ja)
Inventor
川端克宏
谷本啓介
浅井英明
康倫明
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ダイキン工業株式会社
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Publication of WO2009133708A1 publication Critical patent/WO2009133708A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/06—Heat pumps characterised by the source of low potential heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/30—Geothermal collectors using underground reservoirs for accumulating working fluids or intermediate fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy

Definitions

  • the present invention relates to a heat exchanger installed in the ground or underwater, and an air conditioning system using the heat exchanger.
  • a geothermal heat exchanger that collects geothermal heat from the ground is used in a heat pump heating system that uses geothermal heat (see, for example, Patent Document 1).
  • a pipe referred to as an embedded pipe in this specification
  • a heat medium secondary medium
  • the pipe is branched from the buried pipe, a heat exchanger is attached to the branch pipe, and the heat recovered by the heat exchanger is used as a heat source of the heat pump heating system.
  • the present invention has been made in view of the present situation related to the present inventor, and an object thereof is to make it possible to use a heat exchanger installed in the ground or in water for both cooling and heating.
  • the first invention is An outer pipe (51) installed vertically or inclined in the ground or in water, A heat medium sealed in the outer tube (51), A heating heat transfer tube (80) that is inserted into the outer tube (51) to evaporate the refrigerant as it is introduced into the interior; A cooling heat transfer tube (52) that is inserted into the outer tube (51) and that radiates heat from the refrigerant while being introduced into the refrigerant, The cooling heat transfer tube (52) and the heating heat transfer tube (80) exchange heat with the outer tube (51) via the heat medium that changes phase.
  • the heat medium evaporates by exchanging heat in the ground or in water via the inner wall of the outer pipe (51).
  • the heating heat transfer tube (80) exchanges heat with the evaporated heat medium.
  • the heat medium condenses and the refrigerant in the heating heat transfer tube (80) evaporates. That is, the heating heat transfer tube (80) performs heat exchange in the ground or in water using the phase change of the heat medium.
  • this heat exchanger functions as an evaporator.
  • the heat medium is condensed through heat exchange in the ground or in water through the inner wall of the outer pipe (51).
  • the cooling heat transfer tube (52) exchanges heat with the condensed heat medium.
  • the heat medium evaporates and the refrigerant in the cooling heat transfer tube (52) condenses. That is, the cooling heat transfer tube (52) performs heat exchange in the ground or in water using the phase change of the heat medium.
  • this heat exchanger functions as a condenser.
  • At least one of the cooling heat transfer tube (52) and the heating heat transfer tube (80) is formed in a coil shape.
  • the contact area between the cooling heat transfer tube (52) and the heat medium increases.
  • the heating heat transfer tube (80) is configured in a coil shape, the contact area between the heating heat transfer tube (80) and the heat medium increases.
  • the cooling heat transfer tube (52) is disposed near the lower side of the outer tube (51) in the installed state of the outer tube (51),
  • the heat transfer pipe (80) for heating is arranged near the upper side of the outer pipe (51) when the outer pipe (51) is installed.
  • the heat medium condensed by the heat transfer pipe (80) flows downward, and the heat medium exchanges heat with the outer pipe (51) in the process. Further, during the cooling operation, the refrigerant condensed by the outer pipe (51) flows downward and comes into contact with the cooling heat transfer pipe (52) disposed near the lower side of the outer pipe (51). Then, heat exchange is performed between the contacted heat medium and the cooling heat transfer tube (52). That is, the condensed heat medium efficiently contacts the cooling heat transfer tube (52) or the heating heat transfer tube (80).
  • the fourth invention is in any one of the heat exchangers according to the first to third aspects of the invention,
  • the outer pipe (51) and the cooling heat transfer pipe (52) hold the liquid heat medium between the inner wall of the outer pipe (51) and the outer wall of the cooling heat transfer pipe (52). It is arranged so that it may be.
  • the heat medium holding unit (60) holds the liquid heat medium by surface tension.
  • the outer wall of the cooling heat transfer tube (52) is uniformly wetted with the liquid heat medium.
  • At least one of the cooling heat transfer tube (52) and the heating heat transfer tube (80) is in contact with the inner wall of the outer tube (51) to perform heat exchange.
  • the cooling heat transfer tube (52) extends to the lower end of the outer tube (51).
  • This configuration makes it possible to increase the contact area between the cooling heat transfer tube (52) and the heat medium.
  • a wick (100) is provided in the outer pipe (51) along the inner wall of the outer pipe (51).
  • the wick (100) permeates and holds the liquid heat medium in the outer pipe (51) and brings the held liquid refrigerant into contact with the inner wall of the outer pipe (51).
  • the eighth invention is In any one heat exchanger of the first to seventh inventions, A groove (110) that holds the heat medium by surface tension is formed on the inner wall of the outer tube (51).
  • the groove (110) holds the liquid heat medium in the outer pipe (51) and brings the held liquid refrigerant into contact with the inner wall of the outer pipe (51).
  • the ninth invention An air conditioning system that performs cooling and heating by a vapor compression refrigeration cycle, Any one of the first to third invention heat exchangers;
  • the refrigerant flows through the cooling heat transfer pipe (52) during the cooling operation, and the refrigerant flows through the heating heat transfer pipe (80) during the heating operation.
  • a heat exchanger installed in the ground or in water can be used for both cooling and heating.
  • the contact area between at least one of the cooling heat transfer tube (52) and the heating heat transfer tube (80) and the heat medium increases. Therefore, in this heat exchanger, it is possible to improve the heat exchange efficiency.
  • the condensed heat medium efficiently contacts the cooling heat transfer pipe (52) or the heating heat transfer pipe (80), so that the efficiency of cooling and heating can be improved. become.
  • the outer wall of the cooling heat transfer tube (52) is evenly wetted with the liquid heat medium, so that the cooling heat transfer tube (52) and the liquid heat medium are efficient. Heat exchange is performed. Therefore, the refrigerant in the cooling heat transfer tube (52) can be efficiently condensed. That is, the heat exchange performance of the heat exchanger is improved, and the heat exchanger can be downsized.
  • At least one of the cooling heat transfer pipe (52) and the heating heat transfer pipe (80) directly exchanges heat with the inner wall of the outer pipe (51). It becomes possible to condense or evaporate more efficiently. That is, the heat exchange performance of the heat exchanger can be improved.
  • the contact area between the cooling heat transfer tube (52) and the heat medium can be increased, so that the refrigerant in the cooling heat transfer tube (52) is more efficiently condensed. It becomes possible. That is, the heat exchange performance of the heat exchanger can be improved.
  • the wick (100) brings the held liquid refrigerant into contact with the inner wall of the outer pipe (51), uniform wetting is ensured with respect to the inner wall of the outer pipe (51). It becomes possible to do. That is, the heat exchange performance of the heat exchanger can be improved.
  • the groove (110) brings the held liquid refrigerant into contact with the inner wall of the outer pipe (51), so that uniform wetting is ensured with respect to the inner wall of the outer pipe (51). It becomes possible to do. That is, the heat exchange performance of the heat exchanger can be improved.
  • the ninth invention it is possible to perform a cooling operation in which heat is dissipated in the ground or underwater, and a heating operation using heat in the ground or underwater as a heat source.
  • FIG. 1 is a system diagram of an air conditioning system (1) including a ground heat exchanger (50) according to an embodiment of the present invention.
  • FIG. 2 is a longitudinal sectional view showing the underground heat exchanger (50) of the present embodiment.
  • FIG. 3 is a diagram schematically showing a state in which the underground heat exchanger (50) is installed in the ground.
  • 4A and 4B are diagrams for explaining the movement of the heat medium during the cooling operation.
  • FIG. 4A is a cross-sectional view of the underground heat exchanger
  • FIG. 4B is an enlarged view of the heat medium holding portion.
  • FIG. 5 is a longitudinal sectional view showing the configuration of a modification of the underground heat exchanger (50).
  • FIG. 6 is a diagram schematically showing a state in which the heat exchanger (50) is installed in water.
  • FIG. 7 is a diagram schematically showing a state in which the heat exchanger (50) is installed at an inclination.
  • 8A and 8B are diagrams showing another configuration example of the outer tube 51.
  • FIG. 8A is a cross-sectional view of the outer tube
  • FIG. 8B is a perspective view of a part of the outer tube.
  • FIG. 9 is a cross-sectional view showing still another configuration example of the outer tube (51).
  • Embodiment 1 of the Invention demonstrates the example of the heat exchanger (ground heat exchanger) installed in the ground as an example of the heat exchanger of this invention.
  • the underground heat exchanger according to the embodiment of the present invention is used in, for example, a heat pump type air conditioning system capable of cooling and heating operation. And at the time of air_conditionaing
  • an aquifer containing both earth and sand and water other than what was formed only with earth and sand here is soil. That is, this underground heat exchanger may exchange heat with ground water or both of them in addition to earth and sand, depending on the installation location and depth.
  • the example of the air-conditioning system which uses this underground heat exchanger is demonstrated.
  • FIG. 1 is a system diagram of an air conditioning system (1) including a heat exchanger (50) (ground heat exchanger) according to an embodiment of the present invention. As shown in the figure, the air conditioning system (1) includes a refrigerant circuit (10).
  • the refrigerant circuit (10) includes a compressor (20), an indoor heat exchanger (30), an expansion valve (40), a ground heat exchanger (50), a four-way switching valve (71), and a first switching valve ( 72) and a second switching valve (73).
  • the refrigerant circuit (10) is filled with a refrigerant (working fluid).
  • the compressor (20) sucks and compresses the refrigerant from the suction port, and discharges the compressed refrigerant from the discharge port.
  • various compressors such as a scroll compressor can be adopted as the compressor (20).
  • the indoor heat exchanger (30) is an air heat exchanger for exchanging heat between the refrigerant and room air.
  • the indoor heat exchanger (30) is incorporated in a so-called indoor unit that is disposed in a room that performs air conditioning.
  • this refrigerant circuit (10) one end of the indoor heat exchanger (30) is connected to the expansion valve (40), and the other end is connected to a fourth port (described later) of the four-way switching valve (71). ing.
  • the low-pressure refrigerant flowing from the expansion valve (40) into the indoor heat exchanger (30) absorbs the heat of the room air.
  • the heat of the refrigerant discharged from the compressor (20) is radiated to the room air.
  • a cross fin type fin-and-tube heat exchanger or the like can be employed.
  • An indoor fan (31) is installed in the vicinity of the indoor heat exchanger (30). The indoor fan (31) blows conditioned air into the room.
  • the expansion valve (40) has one end connected to the first switching valve (72) and the other end connected to the indoor heat exchanger (30).
  • the expansion valve (40) expands the refrigerant flowing in from the first switching valve (72) or the indoor heat exchanger (30), reduces the pressure to a predetermined pressure, and then flows it out.
  • the four-way switching valve (71) is provided with four ports from first to fourth ports.
  • the four-way switching valve (71) includes a first state (state indicated by a solid line in FIG. 1) in which the first port and the third port communicate simultaneously with the second port and the fourth port, It is possible to switch to a second state (state indicated by a broken line in FIG. 1) in which the second port and the third port communicate at the same time as the fourth port communicates.
  • the first port is connected to the discharge port of the compressor (20), and the second port is connected to the suction port of the compressor (20).
  • the third port is connected to the second switching valve (73), and the fourth port is connected to one end of the indoor heat exchanger (30).
  • FIG. 2 is a longitudinal sectional view showing the underground heat exchanger (50) of the present embodiment.
  • the underground heat exchanger (50) includes an outer pipe (51), a cooling heat transfer pipe (52), and a heating heat transfer pipe (80).
  • FIG. 3 is a diagram schematically showing a state in which the underground heat exchanger (50) is installed in the ground.
  • the stratum includes a layer mainly composed of earth and sand, a layer containing earth and sand, a layer mainly containing water, and a bedrock where rocks are continuously distributed.
  • This underground heat exchanger (50) may be installed in any formation.
  • FIG. 3 shows a state in which the underground heat exchanger (50) is installed in each of these layers.
  • the underground heat exchanger (50) performs heat exchange only in one of the formations. May be installed to do.
  • a predetermined amount of carbon dioxide (CO 2 ) is enclosed in the outer pipe (51) as a heat medium.
  • CO 2 carbon dioxide
  • this heat medium dissipates heat from the inner wall surface of the outer pipe (51) to the soil and condenses, and absorbs heat on the outer wall surface of the cooling heat transfer pipe (52) and evaporates.
  • the soil heat is absorbed from the inner wall surface of the outer pipe (51), and the heat is dissipated and condensed on the outer wall surface of the heating heat transfer pipe (80).
  • the cooling heat transfer tube (52) is inserted into the outer tube (51) and is disposed closer to the lower side than the heating heat transfer tube (80).
  • the cooling heat transfer tube (52) introduces a refrigerant during the cooling operation and releases heat from the refrigerant.
  • the cooling heat transfer tube (52) of the present embodiment is formed in a tubular shape. Specifically, as shown in FIG. 2, the cooling heat transfer tube (52) includes an introduction portion (52a), a lead-out portion (52b), an introduction-side main body portion (52c), a lead-out-side main body portion (52d), and The connection portion (52e) is formed.
  • a material for the cooling heat transfer tube (52) for example, copper, aluminum, an aluminum alloy, or other composite materials can be employed. However, it is necessary to select the thermal conductivity and corrosion resistance so as to match the use conditions.
  • the introduction part (52a) is inserted into the outer pipe (51) from the upper side of the outer pipe (51) (the side that becomes the ground side when the outer pipe (51) is buried), and one end thereof is the second switching Connected to valve (73).
  • the other end of the introduction part (52a) is connected to one end of the introduction-side main body part (52c) above the outer pipe (51).
  • the lead-out part (52b) is inserted into the outer pipe (51) from the upper side of the outer pipe (51), and one end on the outer side of the outer pipe (51) is connected to the first switching valve (72). It is connected.
  • the other end of the lead-out portion (52b) is connected to one end of the lead-out side main body portion (52d) above the inside of the outer tube (51).
  • Both the introduction-side main body portion (52c) and the lead-out-side main body portion (52d) extend from above the outer tube (51) to the bottom (lower end) along the inner wall of the outer tube (51).
  • the connecting portion (52e) crosses the bottom portion in the radial direction at the bottom portion, and is connected to one end of the introduction side main body portion (52c) and one end of the outlet side main body portion (52d) at the bottom portion. That is, in this refrigerant circuit (10), one end of the cooling heat transfer tube (52) is connected to the first switching valve (72), and the other end is connected to the second switching valve (73). Yes.
  • the outer surface wall of the introduction-side main body portion (52c) and the inner surface wall of the outer tube (51) form a heat medium holding portion (60) that holds the liquid heat medium by surface tension.
  • the outer wall of the lead-out body part (52d) and the inner wall of the outer pipe (51) also form a heat medium holding part (60).
  • the outer wall of each main body (52c, 52d) is disposed in contact with the inner wall of the outer tube (51), and as shown in FIGS.
  • the liquid heat medium adhering to the inner wall of the pipe (51) is held between these walls (for example, the outer wall of the introduction-side main body (52c) and the inner wall of the outer pipe (51)) by surface tension.
  • each main body (52c, 52d) does not necessarily need to be in contact with the inner wall of the outer tube (51) as long as the liquid heat medium can be held by the surface tension in this way.
  • the outer surface walls of the main body portions (52c, 52d) are arranged so as to come into contact with the inner wall of the outer tube (51).
  • each main body (52c, 52d) is arranged so that each outer surface wall of each main body (52c, 52d) is in contact with the inner wall of the outer pipe (51), so that each main body (52c, 52d) Direct heat exchange with 51). That is, this direct heat exchange further improves the heat exchange performance in the underground heat exchanger (50).
  • this direct heat exchange further improves the heat exchange performance in the underground heat exchanger (50).
  • the number of the main body portions (52c, 52d) is an example, and the present invention is limited to this example. Not. For example, three or more main body portions may be provided.
  • each main body (52c, 52d) may have a predetermined gap between the inner wall of the outer pipe (51).
  • the heat medium holding part (60) is not necessarily essential as long as the main body parts (52c, 52d) can be wetted with a liquid heat medium.
  • the heating heat transfer tube (80) is inserted into the outer tube (51).
  • the heating heat transfer tube (80) introduces the refrigerant into the interior and evaporates the refrigerant during the heating operation.
  • the heating heat transfer tube (80) is formed of an introduction part (80a), a main body part (80b), and a lead-out part (80c).
  • a material of the heat transfer tube (80) for heating for example, copper, aluminum, an aluminum alloy, or other composite materials can be adopted. However, it is necessary to select the thermal conductivity and corrosion resistance so as to match the use conditions.
  • the refrigerant is introduced into the interior during the heating operation, absorbs heat from the heat medium, and evaporates the introduced refrigerant.
  • the main body part (80b) is formed in a coil shape, and the upper part in the outer pipe (51) so as to surround the introduction part (52a) and the outlet part (52b) of the cooling heat transfer pipe (52). It is arranged closer. That is, the main body (80b) is disposed above the cooling heat transfer tube (52) in the embedded state of the outer tube (51). In the present embodiment, the main body (80b) is in contact with the inner wall surface of the outer tube (51) on the outer peripheral side. However, a predetermined gap may be provided between the main body portion (80b) and the inner wall of the outer tube (51).
  • the introduction part (80a) is a pipe for introducing the refrigerant into the main body part (80b), and the lead-out part (80c) is a pipe for drawing the refrigerant from the main body part (80b).
  • both the introduction part (80a) and the lead-out part (80c) are formed in a straight shape, and are inserted into the outer pipe (51) from above the outer pipe (51).
  • the first and second switching valves (72, 73) are valves that switch the flow of the refrigerant according to whether the heating operation is performed or the cooling operation is performed.
  • the first and second switching valves (72, 73) are an example of the switching unit of the present invention.
  • the first switching valve (72) includes the expansion valve (40), the lead-out part (52b) of the cooling heat transfer pipe (52), or the introduction part (80a) of the heating heat transfer pipe (80). Connect to.
  • the second switching valve (73) is connected to the third port of the four-way switching valve (71) through the introduction part (52a) of the cooling heat transfer pipe (52) or the outlet part of the heating heat transfer pipe (80) ( Connect to 80c).
  • the cooling operation will be described.
  • the four-way switching valve (71) is switched to the first state. That is, the first port and the third port communicate with each other, and at the same time the second port and the fourth port communicate with each other (a state indicated by a solid line in FIG. 1).
  • the first switching valve (72) is switched so that the expansion valve (40) and the lead-out part (52b) of the cooling heat transfer pipe (52) are connected.
  • the second switching valve (73) is switched so that the introduction part (52a) of the cooling heat transfer tube (52) and the third port of the four-way switching valve (71) are connected.
  • the compressor (20) discharges the compressed refrigerant (gas refrigerant) from the discharge port.
  • the refrigerant discharged from the compressor (20) is sent to the introduction part (52a) of the underground heat exchanger (50) and further introduced into the main body parts (52c, 52d).
  • the inner wall of the outer tube (51) is initially in a state equal to the underground temperature.
  • the heat transfer resistance of the soil is large, and the temperature rises in each main body (52c, 52d). Since the amount of heat transfer between the outer pipe (51) and the soil is limited by the heat transfer resistance of the soil, in general, the temperature gradient between the inner wall of the outer pipe (51) and each main body (52c, 52d) is maintained.
  • the flow rate of the refrigerant is controlled so that heat transfer is performed within a range where the temperature distribution in the underground is also kept constant.
  • a part of the heat medium radiates heat to the soil through the inner wall of the outer pipe (51).
  • a part of the heat medium is condensed to be liquid. This prevents the heat transfer from concentrating on the inner wall of the outer pipe (51) and the contact part of each main body (52c, 52d), and works to distribute heat dissipation over the entire inner wall of the outer pipe (51). To do.
  • This liquid heat medium gradually flows downward along the inner wall of the outer tube (51). Then, as shown in FIG. 4, the surface tension generated by the heat medium holding part (60) is formed between the inner wall of the outer pipe (51) and the outer wall of each main body part (52c, 52d). It is attracted to the heat medium holding part (60).
  • each main body (52c, 52d) extends from the upper part of the outer tube (51) to the bottom (lower end), the liquid heat medium and each main body (52c, 52d) can be more efficiently brought into contact with each other. Is possible.
  • the heat medium condensed in the outer pipe (51) is attracted to the outer wall of each main body (52c, 52d) by the heat medium holding section (60), so that each main body (52c, 52d). ) Of the outer wall uniformly gets wet with the liquid heat medium.
  • the heat medium on the outer wall of each main body (52c, 52d) absorbs heat from each main body (52c, 52d) and evaporates.
  • the heat medium evaporated in this way diffuses into the outer tube (51).
  • the diffused heat medium is condensed again by dissipating heat to the soil through the inner wall of the outer tube (51).
  • each main body (52c, 52d) radiates heat to the contacting heat medium. Furthermore, each main body (52c, 52d) radiates heat to the soil via the inner wall of the outer pipe (51) that is in contact. As described above, the main body portions (52c, 52d) dissipate heat, so that the refrigerant introduced into the main body portions (52c, 52d) is condensed. The condensed refrigerant is introduced into the expansion valve (40) through the lead-out part (52b) and the first switching valve (72). The expansion valve (40) flows into the indoor heat exchanger (30) after flowing in and reducing the pressure of the refrigerant.
  • the refrigerant flowing into the indoor heat exchanger (30) absorbs heat from the indoor air and evaporates. As a result, the indoor air is cooled in the indoor heat exchanger (30), and the cooled indoor air is sent back into the room by the indoor fan (31).
  • the refrigerant evaporated in the indoor heat exchanger (30) is introduced into the suction port of the compressor (20).
  • the compressor (20) sucks and compresses the refrigerant and discharges it to the introduction part (52a) of the underground heat exchanger (50).
  • the cooling heat transfer tube (52) exchanges heat with the soil using the phase change of the heat medium.
  • the above operation is repeated, and a refrigeration cycle (cooling in this example) is performed in which the refrigerant is compressed by the compressor (20) using the underground heat exchanger (50) as a condenser. .
  • the heating operation of the air conditioning system (1) will be described.
  • the four-way selector valve (71) is switched to the second state. That is, the first port and the fourth port communicate with each other, and at the same time the second port and the third port communicate with each other (a state indicated by a broken line in FIG. 1).
  • the first switching valve (72) is switched so that the expansion valve (40) and the introduction part (80a) of the heating heat transfer pipe (80) are connected.
  • the second switching valve (73) is switched so that the lead-out portion (80c) of the heating heat transfer tube (80) and the third port of the four-way switching valve (71) are connected.
  • the compressor (20) discharges the compressed refrigerant (gas refrigerant) from the discharge port.
  • the refrigerant discharged from the compressor (20) is sent to the indoor heat exchanger (30) through the four-way switching valve (71).
  • the refrigerant that has flowed into the indoor heat exchanger (30) radiates heat to the indoor air in the indoor heat exchanger (30).
  • the indoor air is heated, and the heated indoor air is sent back into the room by the indoor fan (31).
  • the refrigerant radiated by the indoor heat exchanger (30) is sent to the expansion valve (40).
  • the expansion valve (40) depressurizes the flowing refrigerant.
  • the decompressed refrigerant is introduced into the introduction part (80a) via the first switching valve (72) and further introduced into the main body part (80b).
  • the inner wall of the outer tube (51) is initially in a state equal to the underground temperature.
  • the heat transfer resistance of the soil is large, so that a temperature gradient proportional to the amount of heat released to the heating heat transfer tube (80) via the heat medium is generated, and the temperature of the soil decreases.
  • the gaseous heat medium absorbs heat in the main body (80b) of the heating heat transfer tube (80). Thereby, the gaseous heat medium is condensed into a liquid.
  • the heat medium that has become a liquid is contained in the outer tube (51). It flows down along the wall. In this way, while the heat medium travels along the inner wall surface of the underground heat exchanger (50), the heat medium again evaporates by absorbing heat from the soil through the inner surface wall.
  • the main body (80b) absorbs heat from the heat medium, so that the introduced refrigerant evaporates and becomes a gas refrigerant. And this gas refrigerant is derived
  • the above operation is repeated, and a refrigeration cycle (heating in this example) is performed in which the refrigerant is compressed by the compressor (20) using the underground heat exchanger (50) as an evaporator.
  • the underground heat exchanger (50) can perform the cooling operation in addition to the heating operation.
  • the heating heat transfer tube (80) of the present embodiment is disposed closer to the upper portion of the outer tube (51) in the embedded state of the outer tube (51), so that it is liquefied in the outer tube (51). It is possible to ensure a sufficient time and area for the flowing down heat medium to contact the inner wall of the outer pipe (51). That is, in this embodiment, it is possible to efficiently perform heat exchange during the heating operation.
  • the heat medium condensed in the outer pipe (51) is drawn to the outer surface wall of the main body (52c, 52d) of the cooling heat transfer pipe (52) by the heat medium holding part (60). Therefore, the outer surface walls of the main body portions (52c, 52d) are uniformly wetted with the liquid heat medium. Therefore, heat exchange is efficiently performed between the outer wall of each main body (52c, 52d) and the liquid heat medium, and the refrigerant in each cooling heat transfer tube (52) can be efficiently condensed. it can. That is, in this embodiment, the heat exchange performance of the underground heat exchanger can be improved even during the cooling operation.
  • FIG. 5 is a longitudinal sectional view showing the structure of the underground heat exchanger (50) according to the modification of the embodiment.
  • the underground heat exchanger (50) includes an outer pipe (51), a heating heat transfer pipe (80), and a cooling heat transfer pipe (90).
  • the cooling heat transfer tube (90) of the present modification includes an introduction part (91), a lead-out part (92), and a main body part (93).
  • the introduction part (91) is inserted into the outer pipe (51) from the upper side of the outer pipe (51) (the side that becomes the ground side when the outer pipe (51) is embedded), and one end thereof is the second switching Connected to valve (73).
  • the other end of the introduction part (91) is connected to one end of the main body part (93) in the lower part of the outer pipe (51).
  • the lead-out section (92) is inserted into the outer pipe (51) from the upper side of the outer pipe (51), and one end outside the outer pipe (51) is connected to the first switching valve (72). ing.
  • the other end of the lead-out portion (92) is connected to the other end of the main body portion (93) below the outer tube (51).
  • the main body portion (93) is formed in a coil shape and is disposed on the lower side of the outer tube (51). In the present embodiment, the main body portion (93) is in contact with the inner wall surface of the outer tube (51) on the outer peripheral side thereof. Also in this modified example, the outer wall of the main body (93) and the inner wall of the outer tube (51) form a heat medium holding part (60) that holds the liquid heat medium by surface tension. .
  • the contact area with the liquid heat medium can be made larger than that of the heating heat transfer tube (80). That is, in this modification, it becomes possible to improve the cooling efficiency.
  • the cooling heat transfer tube (90) is located below the outer tube (51), the liquid heat medium and the main body (93) can be brought into contact more efficiently. That is, the condensed heat medium flows on the inner wall of the outer pipe (51) and flows toward the bottom, so that the heating heat transfer pipe (80) of the present modification uses the heat medium below the outer pipe (51). It can be received efficiently by approaching.
  • FIG. 6 is a diagram schematically showing a state in which the heat exchanger (50) is installed in water.
  • Examples 1 and 2 are shown as installation examples of the heat exchanger (50) (underwater heat exchanger).
  • Example 1 is an example in which a heat exchanger (50) is installed in a water tank or pool.
  • Example 2 is an example in which a heat exchanger (50) is installed in the sea, lake, or pond.
  • “HP” indicates a main part (a part other than the heat exchanger) of the air conditioning system (1) (the same applies hereinafter).
  • FIG. 7 is a diagram schematically showing a state in which the heat exchanger (50) is installed at an inclination.
  • FIG. 7A shows an example in which the heat exchanger (50) is inclined and installed in the ground
  • FIG. 7B shows an example in which the heat exchanger (50) is inclined and installed in the water.
  • FIG. 7B shows an example in which the heat exchanger (50) is inclined and installed in the sea, lake, or pond, similarly, it can be arranged in an inclined manner in a water tank or a pool. .
  • a wick (100) may be provided on the inner wall of the outer tube (51).
  • the wick (100) permeates and holds the liquid heat medium in the outer pipe (51) and brings the held liquid refrigerant into contact with the inner wall of the outer pipe (51).
  • Examples of such wick (100) include metal porous bodies, porous ceramics, fiber aggregates, and the like.
  • a plurality of grooves (110) may be provided on the inner wall of the outer tube (51) as shown in the cross-sectional view of FIG.
  • the groove (110) has a width, a depth, a number, and the like so as to hold a liquid heat medium in the outer pipe (51).
  • the direction of the groove (110) is not limited to a direction parallel to the axial direction of the outer tube (51).
  • the circumferential direction may be sufficient and a spiral shape may be sufficient.
  • the heating heat transfer tube (80) is not limited to the above one as long as it functions as a heating heat exchanger (evaporator).
  • Carbon dioxide used as a heat medium is also an example.
  • a heat medium that changes phase in the temperature range of the refrigerant in the refrigerant circuit (for example, about 10 ° C. to + 40 ° C.) can be used.
  • ammonia can be employed.
  • the heat medium holding part (60) is not essential.
  • the present invention is useful as a heat exchanger installed in the ground or in water and an air conditioning system using the heat exchanger.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

Un échangeur de chaleur est doté d’un tuyau externe (51) monté dans le sol ou sous l'eau dans une position verticale ou inclinée, et un fluide thermique est renfermé dans le tuyau externe (51). Un tuyau de transfert de chaleur (80) destiné au chauffage est inséré dans le tuyau externe (51), et le tuyau de transfert de chaleur (80) destiné au chauffage permet à un fluide frigorigène d'être introduit à l'intérieur et fait évaporer le fluide frigorigène. Un tuyau de transfert de chaleur (52) destiné au refroidissement est également inséré dans le tuyau externe (51), et le tuyau de transfert de chaleur (52) pour le refroidissement permet au fluide frigorigène d'être introduit à l’intérieur et dissipe la chaleur du fluide frigorigène. Le tuyau de transfert de chaleur (52) destiné au refroidissement et le tuyau de transfert de chaleur (80) destiné au chauffage sont amenés à échanger de la chaleur avec le tuyau externe (51) via le fluide thermique dont la phase change.
PCT/JP2009/001967 2008-04-30 2009-04-30 Echangeur de chaleur et système de conditionnement d’air WO2009133708A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2008-118186 2008-04-30
JP2008118186 2008-04-30
JP2008-323746 2008-12-19
JP2008323746 2008-12-19

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WO2009133708A1 true WO2009133708A1 (fr) 2009-11-05

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011220603A (ja) * 2010-04-09 2011-11-04 Chemical Grouting Co Ltd 地熱利用システム
JP2012198015A (ja) * 2011-03-22 2012-10-18 Tai-Her Yang Ｕ型管路の断熱システム

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05118700A (ja) * 1991-10-31 1993-05-14 Hokkaido Electric Power Co Inc:The ヒートポンプ型空調設備
JP2000227289A (ja) * 1999-02-01 2000-08-15 Behr Gmbh & Co 一体型ヘッダ・熱交換器組立体
JP2000356433A (ja) * 1999-06-17 2000-12-26 Kubota Corp 地中熱交換器、及び、熱源設備、及び、熱源設備の運転方法
JP2006313034A (ja) * 2005-05-06 2006-11-16 Nippon Steel Engineering Co Ltd 地中熱利用装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05118700A (ja) * 1991-10-31 1993-05-14 Hokkaido Electric Power Co Inc:The ヒートポンプ型空調設備
JP2000227289A (ja) * 1999-02-01 2000-08-15 Behr Gmbh & Co 一体型ヘッダ・熱交換器組立体
JP2000356433A (ja) * 1999-06-17 2000-12-26 Kubota Corp 地中熱交換器、及び、熱源設備、及び、熱源設備の運転方法
JP2006313034A (ja) * 2005-05-06 2006-11-16 Nippon Steel Engineering Co Ltd 地中熱利用装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011220603A (ja) * 2010-04-09 2011-11-04 Chemical Grouting Co Ltd 地熱利用システム
JP2012198015A (ja) * 2011-03-22 2012-10-18 Tai-Her Yang Ｕ型管路の断熱システム

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