JP4764796B2 - Geothermal heat extraction and heating system - Google Patents

Description

  The present invention relates to an air conditioning system, and more particularly to a geothermal heat collecting air conditioning system that collects underground heat and uses it as a heat source for air conditioning.

  Against the backdrop of increasing awareness of environmental conservation in recent years, further promotion of energy conservation measures is required in order to suppress the emission of greenhouse gases such as carbon dioxide. Under such circumstances, reducing the energy consumption of air conditioning equipment used for cooling or heating in air conditioning contributes to energy saving.

One technique used to reduce the energy consumption of air conditioning equipment is what is called an earth tube (sometimes called a cool tube). The earth tube embeds a tube that allows air to flow in the ground, heat is exchanged between the air flowing in the tube and the ground, and the air after heat exchange is used for air conditioning (for example, (See Patent Document 1). The underground temperature is almost constant throughout the four seasons, and is lower than the atmospheric temperature in summer and higher than the atmospheric temperature in winter, reducing the heat load of air after heat exchange. As a result, the energy consumption of the air conditioner can be reduced.
JP-A-9-72011 (paragraph 0017 etc.)

  However, as the heat exchange between the heat of the air in the tube and the heat of the ground progresses, the temperature of the ground around the tube approaches the temperature of the air taken into the tube, and the heat of the air in the tube The amount of heat exchanged with the underground heat has decreased, and the amount of reduction in energy consumption of air conditioning equipment has become smaller.

  In view of the above-described problems, an object of the present invention is to provide a geothermal heat-collecting air-conditioning system that can continuously reduce the energy consumption of air-conditioning equipment used for cooling or heating.

In order to achieve the above object, a geothermal heat collection cooling and heating system according to the invention described in claim 1 is embedded under the ground surface GL and flows air a therein as shown in FIG. 1 (FIG. 4), for example. A wind guide 11; an air conditioning apparatus 20 (40) that introduces air a flowing through the wind guide 11 and performs at least one of cooling and heating of the heat medium wm (ar) using the air a as a heat source; A groundwater heat transfer means 50 for transferring heat of the moving groundwater g on the outer surface of the groundwater; the groundwater heat transfer means 50 is disposed along the wind guide 11 above the wind guide 11 below the ground surface GL. The groundwater g has a sprinkling pipe 51 that sprinkles the groundwater g on the outer surface of the wind guide 11 and a groundwater pump 53 that pumps the groundwater g toward the sprinkling pipe 51. It is configured to merge with the groundwater below. Here, the geothermal heat collection cooling and heating system is a system that extracts underground heat and uses it for cooling and heating. Also, the transfer of heat from the moving groundwater means that the surface around the wind guide does not saturate so that heat exchange with the air flowing through the wind guide can be maintained. It is to transfer the heat of groundwater. Moreover, the heat transmitted by the groundwater heat transfer means includes not only warm heat but also cold heat.

  When configured in this way, the heat of groundwater that moves to the outer surface of the wind guide is transmitted, so that the temperature difference between the air in the wind guide and the ground is prevented from becoming so small that heat exchange cannot be performed. It is possible to practically reduce the energy consumption of the air conditioning equipment.

  Moreover, the geothermal heat collection cooling / heating system according to the invention described in claim 2 is the geothermal heat collection cooling / heating system according to claim 1, wherein the surface of the air guide 11 (see, for example, FIG. 1) is uneven.

  If comprised in this way, the surface area of a wind guide can be increased and the amount of exchange heat between the ground and the air which flows through the inside of a wind guide can be increased.

  Moreover, the geothermal heat collection cooling and heating system which concerns on invention of Claim 3 is a wind guide 11 in the geothermal heat collection cooling and heating system of Claim 1 or Claim 2, as shown, for example in FIG. 6 (FIG. 7). There is provided swirl flow inducing means 60 (68) that uses the air a flowing therein as a swirl flow.

  If comprised in this way, the distance which the air which flows the inside of a wind guide contacts a wind guide becomes long, and the amount of exchange heat between the underground and the air which flows the inside of a wind guide can be increased.

  Moreover, the geothermal heat collection cooling and heating system which concerns on invention of Claim 4 is shown in FIG. 1 (FIG. 4), for example, The geothermal heat collection cooling and heating system of any one of Claim 1 thru | or 3 is provided. In 1 (2), an air introduction portion 22 (42) that takes in air a as a heat source and constitutes the air conditioning device 20 (40) is disposed in the device installation chamber 91.

  If comprised in this way, it can prevent that external air is directly introduce | transduced into the apparatus for air conditioning, and can suppress the raise of the humidity of the air taken in into an air introduction part.

  Moreover, the geothermal heat collection cooling and heating system which concerns on invention of Claim 5 is a heat carrier in the geothermal heat collection cooling and heating system 1 of any one of Claim 1 thru | or 4, as shown, for example in FIG. wm is water, and a heat storage tank 92 for storing water wm whose temperature is adjusted by the air conditioning equipment 20 is provided.

  If comprised in this way, it will become possible to store the water which adjusted temperature, and to utilize for arbitrary time.

  According to the present invention, since the heat of the groundwater moving to the outer surface of the air guide is transmitted, the temperature difference between the air in the air guide and the ground is prevented from becoming so small that heat exchange cannot be performed. It is possible to practically reduce the energy consumption of the air conditioning equipment.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or similar members are denoted by the same or similar reference numerals, and redundant description is omitted.

  First, with reference to FIG. 1, the structure of the geothermal heat collection cooling and heating system 1 which concerns on the 1st Embodiment of this invention is demonstrated. FIG. 1 is a schematic system diagram for explaining a geothermal heat collection cooling / heating system 1. The geothermal heat collection cooling / heating system 1 includes an air guide 11 for flowing air a, a heat pump chiller 20 as an air conditioning device, a heat storage tank 92, a fan coil unit 33 disposed in a living room 94, and groundwater heat transfer means. The underground water sprinkling system 50 is provided.

  The wind guide 11 is typically embedded in the aquifer Gb below the ground surface GL. Here, the “aquifer” is a permeable layer that has a large gap between particles constituting the formation and is saturated with groundwater. That is, the groundwater g exists in the aquifer Gb. In the underground G in the example shown in FIG. 1, a ground layer Ga, an aquifer Gb, and a deep layer Gc are formed in order from the ground surface GL vertically downward. The aquifer Gb has a higher heat transfer rate in the ground than the surface layer Ga and the deep layer Gc, and therefore the amount of heat exchanged with the air a flowing in the air guide 11 is increased.

  Typically, a synthetic resin corrugated pipe (spiral grooved tube) is used for the air guide 11. When the air guide 11 is made of a synthetic resin, the corrosion resistance is improved. In general, synthetic resin ducts are advantageous in that they are lighter, easier to construct, and less expensive than those made of metal, cast iron, or concrete. Furthermore, since the corrugated pipe has irregularities on the surface, the surface area of the air guide 11 can be increased. When the surface area of the air guide 11 is increased by forming irregularities on the surface, the heat transfer area from the ground increases, and the amount of heat exchanged between the aquifer Gb and the air a can be increased.

  If the wind guide 11 is installed in the aquifer Gb at the time of rooting work when building the building where the geothermal heat-collecting cooling / heating system 1 is constructed, it is preferable to save work. Moreover, in order to grasp | ascertain the aquifer Gb of underground G, you may utilize the data of the ground investigated, for example, when laying the foundation pile of the building which installs the geothermal heat collection cooling and heating system 1. FIG. Both ends of the air guide 11 are led to an underground chamber 91 as an equipment installation room in which the outdoor unit 22 of the heat pump chiller 20 is installed. The air in the underground chamber 91 is taken in, and the aquifer Gb and heat The exchanged air a is disposed so as to be supplied to the underground chamber 91 again. In the air guide 11, a fan 12 for flowing air a is disposed in the underground chamber 91.

  The heat pump chiller 20 is an apparatus that produces cold water and hot water as a heat medium used for air conditioning with air as a heat source. Hereinafter, cold water and warm water as a heat medium may be referred to as heat medium water wm. The heat pump chiller 20 heats the heat transfer water wm with heat released when the refrigerant r condenses using the heat pump cycle of the refrigerant r, and when the refrigerant r evaporates using the refrigeration cycle of the refrigerant r. It is a unit that cools the heat transfer water wm by absorbing heat from the heat transfer water wm. The heat pump chiller 20 in the present embodiment includes an indoor unit 21 and an outdoor unit 22 as an air introduction unit. The indoor unit 21 is a water heat exchanger that exchanges heat between the heat transfer water wm and the refrigerant r. The outdoor unit 22 is an air heat exchanger that performs heat exchange between the air a and the refrigerant r. The indoor unit 21 includes a water temperature adjusting unit 21a and a refrigerant introducing unit 21b. The water temperature adjusting unit 21a introduces the heat transfer water wm. The refrigerant introduction part 21b has a compressor (not shown) and is configured to introduce the refrigerant r. The outdoor unit 22 and the refrigerant introduction part 21 b are connected by an in-machine pipe 23. The refrigerant r flows inside the in-machine piping 23. Connected to the water temperature adjusting unit 21a are an introduction pipe 25 for introducing the heat transfer medium wm and a lead-out pipe 26 for deriving the heat transfer medium wm whose temperature has been adjusted. The other ends of the introduction pipe 25 and the outlet pipe 26 are led to the heat storage tank 92.

  The heat storage tank 92 is a water tank that stores the heat transfer water wm whose temperature is adjusted by the heat pump chiller 20. When there is the heat storage tank 92, the heat pump chiller 20 can be operated regardless of the generation time of the load in the living room 94. Therefore, when operating the heat pump chiller 20, it becomes possible to always operate at full load. Full load operation is generally the most efficient. Moreover, if there exists the thermal storage tank 92, it will become possible to drive the heat pump chiller 20 with the electric power generated at night when electric power demand is generally low, which will contribute to the leveling of electric power usage. In general, night power is less expensive than purchasing electricity during the day, so there is an economic advantage.

  The heat storage tank 92 is typically a water tank surrounded by a casing (concrete) using an underground pit, but is a portable water tank made of FRP or steel plate installed on the ground or indoors. Also good. Moreover, in order to suppress the temperature change until the heat-medium water wm temperature-controlled with the heat pump chiller 20 is utilized for air conditioning, the thermal storage tank 92 is preferably insulated appropriately. For the heat insulation, an appropriate method may be selected from various known techniques. The heat storage tank 92 is provided with a heat medium water pump 24 that pumps the heat medium water wm to the water temperature adjusting unit 21 a of the heat pump chiller 20. An introduction pipe 25 is connected to the heat medium water pump 24. Further, the heat storage tank 92 is provided with a cold / hot water pump 31 that pumps the heat transfer water wm to the fan coil unit 33 as the outgoing / warm water CHS. The outgoing / warm water CHS becomes cold water when the living room 94 is cooled, and becomes hot water when the room 94 is heated. The chilled / hot water pump 31 is connected to an outgoing pipe 32 that flows the chilled / hot water CHS toward the fan coil unit 33. Further, the heat storage tank 92 is provided with an end portion of a return pipe 34 through which the return cold / hot water CHR derived from the fan coil unit 33 flows.

  The fan coil unit 33 takes in the air ar of the living room 94 and introduces the cool / warm water CHS, and performs heat exchange between the taken air ar and the introduced cool / warm water CHS, and uses the air as after the heat exchange as a fan. This is a device supplied to the living room 94 (not shown). The fan coil unit 33 is one of heat exchange devices. In the example shown in FIG. 1, the fan coil unit 33 is installed on the ceiling, but it may be floor-mounted or wall-mounted. Also, it does not matter whether it is concealed or exposed. An outgoing pipe 32 and a return pipe 34 are connected to the fan coil unit 33.

  In the example shown in FIG. 1, a machine room 93 as an equipment installation room is provided next to the living room 94. The machine room 93 and the living room 94 are partitioned by a partition wall 95. The underground chamber 91 and the heat storage tank 92 are formed under the slabs of the machine room 93 and the living room 94. Moreover, the underground chamber 91 and the heat storage tank 92 are arrange | positioned below the ground surface GL. Although not shown, when condensed water is generated in the air guide 11, a dredger or a drain pipe is provided at an appropriate location of the air guide 11, and the generated condensed water is discharged from the air guide 11. It is good to do so.

  The groundwater sprinkling system 50 will now be described with reference to FIG. 2 together with FIG. 2A and 2B are schematic diagrams for explaining the groundwater sprinkling system 50. FIG. 2A is a schematic diagram of the configuration, and FIG. The groundwater sprinkling system 50 is a system that artificially and forcibly exchanges heat between the air a in the air guide 11 and the aquifer Gb. The groundwater sprinkling system 50 includes a sprinkler pipe 51 that sprinkles groundwater g toward the outer surface of the wind guide 11, a groundwater pump 53 that pumps the groundwater g toward the sprinkler pipe 51, and a sprinkler pipe from the groundwater pump 53. And a guide pipe 52 leading to 51. “Sprinkling” here means that when the air guide 11 is present in the groundwater g, the heat from the groundwater g moving to the outer surface of the air guide 11 can be transmitted from a plurality of locations. This is a concept including deriving water toward the lead 11. The plurality of locations are typically the entire area of the buried wind guide 11 where heat exchange between the underground G and the air a is performed.

  The water spray pipe 51 is configured such that a plurality of small holes 51h are formed in the pipe, and the groundwater g flowing inside can be led out of the pipe from the small holes 51h. The water spray pipe 51 is typically a hard vinyl chloride pipe. Two small holes 51h are typically formed on the circumference of the tube so as to bisect the tube in a cross section perpendicular to the axis of the tube, and are arranged in the longitudinal direction with an appropriate interval in the longitudinal direction of the tube. A plurality are formed along. The size of the small holes 51h is appropriately determined in consideration of the desired amount of groundwater g sprayed, flow resistance, and the like, and may be, for example, about 1/8 to 1/16 of the nominal diameter of the water spray pipe 51.

  The water spray pipe 51 is disposed on the upper part of the air guide 11. Preferably, the air guide 11 is disposed so that the center of the cross section in the direction perpendicular to the axis of the water spray pipe 51 is positioned vertically above the center of gravity of the cross section in the direction perpendicular to the axis of the air guide 11. Moreover, the water spray pipe 51 is arrange | positioned in the direction where the small hole 51h is located in each right and left with respect to the axis | shaft (virtual line) of the perpendicular direction which passes through the center of the cross section perpendicular to the axis. By being arranged in this way, the groundwater g is sprinkled on both sides with respect to the top of the air guide 11. It is preferable that the water spray pipe 51 is disposed on the upper part of the air guide 11 over a portion (length) in which the air a in which heat exchange is substantially performed with the aquifer Gb flows.

  The groundwater pump 53 is disposed in a pump pit 54 formed vertically below the surface of the groundwater g (typically, the boundary surface between the surface layer Ga and the aquifer Gb). The groundwater pump 53 is typically a submersible pump. At the upper part of the pump pit 54, a water passage lid 54a is installed so that gravel on the upper part does not enter the pump pit 54. The water flow lid 54 a is formed of a mesh or a punching metal so that the groundwater g can be introduced into the pump pit 54. A guide pipe 52 is connected to the groundwater pump 53. The guide tube 52 is typically a hard vinyl chloride tube. The guide pipe 52 is connected to one end of the water spray pipe 51 through the water passage lid 54a. A cap (not shown) is attached to the other end of the water spray pipe 51.

  With reference to FIG.1 and FIG.2 continuously, the effect | action of the geothermal heat collection cooling / heating system 1 is demonstrated. In the geothermal heat collection cooling and heating system 1 configured as described above, the heat pump chiller 20 is activated (refrigerant introduction unit) in order to adjust the heat transfer water wm in the heat storage tank 92 to a temperature suitable for the use of cooling and heating in the living room 94. The compressor 21b (not shown) is started), and the heat medium water pump 24 and the fan 12 are started. When the heat medium water pump 24 is activated, the heat medium water wm is introduced into the water temperature adjusting unit 21a. The refrigerant introduction part 21b acts as an evaporator when lowering the temperature of the heat transfer water wm introduced into the water temperature adjustment part 21a (when operating as a chiller), and when raising the temperature of the heat transfer water wm (heat pump) Acts as a condenser. On the other hand, the outdoor unit 22 acts as a condenser when lowering the temperature of the heat transfer water wm (when operating as a chiller), and evaporates when increasing the temperature of the heat transfer water wm (when operating as a heat pump). Acts as a vessel. When the outdoor unit 22 acts as a condenser, the lower the temperature of the air a as a heat source, the higher the COP (coefficient of performance). When the outdoor unit 22 acts as an evaporator, the temperature of the air a as a heat source is high. The COP becomes higher (see FIG. 3). FIG. 3A shows an example of the relationship between the temperature of the air a when the air a is a cold heat source and the COP. FIG. 3B shows the temperature of the air a when the air a is a heat source and the COP. One example of the relationship is shown. The relationship between the temperature of the air a and the COP is a value specific to the model, which varies depending on the type of heat pump chiller.

  When the heat pump chiller 20 is used as a chiller, the COP is higher as the temperature of the air a as a heat source is lower. When the heat pump chiller 20 is used as a heat pump, the COP is higher as the temperature of the air a as a heat source is higher. The higher the COP of the heat pump chiller 20, the less energy consumption in the heat pump chiller 20. The geothermal heat collecting and cooling system 1 uses the air guide 11 (so-called earth tube) to lower the temperature of the air a when the heat pump chiller 20 is used as a chiller, and the temperature of the air a when used as a heat pump. It is rising. The temperature in the aquifer Gb varies depending on the region, but in regions where it is desirable to cool in the summer and to heat in the winter, the temperature is generally below 20 ° C in summer and above 7 ° C in winter. It is. Thus, the temperature of the aquifer Gb is lower than the outside air temperature in summer and higher than the outside air temperature in winter, and is a temperature at which heat can be collected for air conditioning.

  When the fan 12 is activated, the air a flows in the air guide 11, and heat exchange is performed between the air a flowing in the air guide 11 and the aquifer Gb. By this heat exchange, the air a is pre-cooled (during cooling) or pre-heated (during heating) and supplied to the outdoor unit 22 in the underground chamber 91. The refrigerant r of the heat pump chiller 20 is condensed by the pre-cooled air a during cooling and is evaporated by the pre-heated air a during heating, and the cycle of the heat pump chiller 20 is continued. The air a heat-exchanged with the refrigerant r in the outdoor unit 22 is sucked into the fan 12 and flows through the air guide 11 again. As described above, when the air a supplied to the outdoor unit 22 is circulated, the generation of condensation in the air guide 11 can be suppressed, particularly in the summer, as compared with the case where outside air is introduced each time.

  The geothermal heat collecting and cooling system 1 further uses a groundwater sprinkling system 50. When the groundwater pump 53 is activated, the groundwater g stored in the pump pit 54 is pumped to the water spray pipe 51 through the guide pipe 52. The groundwater g introduced into the sprinkling pipe 51 is led out of the pipe from the small hole 51 h and sprinkled on the outer surface of the air guide 11. Here, being sprayed on the outer surface of the air guide 11 includes being sprayed on the aquifer Gb in contact with the outer surface of the air guide 11. The aquifer Gb in contact with the outer surface of the air guide 11 is typically a portion of the aquifer Gb that contributes to heat exchange with the air a flowing in the air guide 11. When the groundwater g is sprinkled on the outer surface of the air guide 11, it is possible to prevent the temperature difference between the air a and the aquifer Gb from becoming so small that heat exchange is not performed. The heat exchange between the air a and the aquifer Gb can be performed continuously. Moreover, since the groundwater sprinkling system 50 activates the groundwater pump 53 and sprinkles the groundwater g, it is possible to stably create a state in which there is a temperature difference between the air a in the air guide 11 and the aquifer Gb. The sprinkled groundwater g merges with the underground water in the ground. The underground groundwater flows into the pump pit 54 whose water level has decreased due to the water supply by the underground pump 53. In this way, groundwater is circulated and heat is used, but groundwater itself is not consumed, so no ground subsidence occurs.

  In FIG. 1, the wind guide 11 is shown as being embedded in the aquifer Gb. However, in the groundwater sprinkling system 50, the wind guide 11 is disposed above the surface of the groundwater g in the aquifer Gb. Even in such a case, heat exchange with the air a in the air guide 11 can be promoted through the groundwater g. In this case, if the lower part of the wind guide 11 is arranged so as to be immersed in the groundwater g, for example, the groundwater g sprayed from the water spray pipe 51 penetrates into the underground G and reaches the outer surface of the wind guide 11. Even if a portion that does not occur is generated, the groundwater g may rise due to a capillary phenomenon in the gap formed between the outer surface of the wind guide 11 and the underground G in this part, and the air flowing in the wind guide 11 Since it becomes possible to promote heat exchange with a and underground G, it is preferable. In addition, since the aquifer Gb has a gentle flow of groundwater g, when the air guide 11 is embedded in the aquifer Gb, the groundwater g moves along the outer surface of the air guide 11, and the air a Heat exchange with the groundwater g.

  In order to use the heat transfer water wm in the heat storage tank 92, the temperature of which has been adjusted by the heat pump chiller 20, for air conditioning in the living room 94, the cold / hot water pump 31 is activated and the cool / warm water CHS is supplied to the fan coil unit 33. . In the fan coil unit 33, heat exchange is performed between the taken-in air ar and the introduced cool / warm water CHS, and the air as after heat exchange is supplied to the room 94 by a fan (not shown), thereby cooling and heating the room 94. Is done. The heat transfer water after heat exchange returns to the heat storage tank 92 as return cold / hot water CHR. The temperature of the returned cold / warm water CHR (heat medium water wm) returned to the heat storage tank 92 is adjusted by the heat pump chiller 20.

  In the above description of the geothermal heat collecting and cooling system 1, the heat pump chiller 20 is a separate type divided into the indoor unit 21 and the outdoor unit 22, but a water heat exchanger and an air heat exchanger (air introduction unit) May be an integrated type housed in one housing. Even in the case of the integrated type, the heat pump chiller can be installed in the equipment installation room (for example, the machine room 93). In addition, although the heat exchange device has been described as the fan coil unit 33, other known heat exchange devices such as an air handling unit may be used.

  Next, with reference to FIG. 4, the geothermal heat collection cooling and heating system 2 which concerns on the 2nd Embodiment of this invention is demonstrated. FIG. 4 is a schematic system diagram illustrating the geothermal heat collection cooling / heating system 2. The geothermal heat collection cooling / heating system 2 includes a package type air conditioner 40 (hereinafter referred to as a “package 40”) as an air conditioning device, whereas the geothermal heat collection cooling / heating system 1 (see FIG. 1) has a heat pump. A chiller 20 (see FIG. 1), a heat medium water pump 24 (see FIG. 1), a cold / hot water pump 31 (see FIG. 1), a fan coil unit 33 (see FIG. 1), and a heat storage tank 92 (see FIG. 1) are provided. There is no compact configuration. In addition to the package 40, the geothermal heat collection cooling / heating system 2 includes a wind guide 11 and a groundwater sprinkling system 50 as groundwater heat transfer means. Since the air guide 11 and the groundwater sprinkling system 50 are configured in the same manner as in the geothermal heat collection cooling and heating system 1 (see FIG. 1), redundant description is omitted.

  The package 40 uses air as a heat source, heats the air ar as a heat medium with heat released when the refrigerant r condenses using a heat pump cycle of the refrigerant r, and uses the refrigeration cycle of the refrigerant r to cool the refrigerant. This unit cools the air ar by absorbing heat from the air ar when r evaporates. The package 40 in the present embodiment has an indoor unit 41 and an outdoor unit 42. The indoor unit 41 is a heat exchanger that performs heat exchange between the refrigerant r and the air ar in the living room 94. The outdoor unit 42 is a heat exchanger that performs heat exchange between the air a and the refrigerant r in the underground chamber 91. The indoor unit 41 and the outdoor unit 42 are connected by a refrigerant pipe 43. The refrigerant r flows through the refrigerant pipe 43.

  The operation of the geothermal heat collection cooling / heating system 2 is as follows. In the geothermal heat collection cooling / heating system 2, the package 40 and the fan 12 are activated in order to heat / cool the living room 94. The outdoor unit 42 of the package 40 acts as a condenser during cooling, and acts as an evaporator during heating. When the outdoor unit 42 acts as a condenser, the lower the temperature of the air a as the heat source, the higher the COP. When the outdoor unit 42 acts as the evaporator, the higher the temperature of the air a as the heat source, the higher the COP. This is the same as in the case of the heat pump chiller 20 (see FIG. 1).

  On the other hand, when the fan 12 is activated, the air a flows through the air guide 11, and heat exchange is performed between the air a flowing in the air guide 11 and the aquifer Gb. By this heat exchange, the air a is pre-cooled (during cooling) or pre-heated (during heating) and supplied to the outdoor unit 42 in the underground chamber 91. The refrigerant r in the package 40 is condensed by the air a pre-cooled during cooling in the outdoor unit 42 and evaporated by the air a pre-heated during heating, and the cycle of the package 40 is continued. The air a heat-exchanged with the refrigerant r in the outdoor unit 42 is sucked into the fan 12 and flows through the air guide 11 again. When the air a flows through the air guide 11, the ground water g is sprinkled on the outer surface of the air guide 11 by the activation of the ground water sprinkling system 50 (see also FIG. 2), and the air a becomes small by heat exchange between the aquifer Gb. This prevents the temperature difference between the two from becoming so small that heat exchange is not performed. Thereby, heat exchange with air a and aquifer Gb can be performed continuously. On the other hand, the air ar that has exchanged heat with the refrigerant r in the indoor unit 41 is supplied to the living room 94 as supply air as as a heat medium whose temperature is adjusted, and the heating and cooling of the living room 94 is performed.

  In the geothermal heat collection cooling and heating systems 1 and 2 described above, a groundwater circulation system may be used as a modification of the groundwater sprinkling system 50. Although the illustration of the groundwater circulation system itself is omitted, the outline of the groundwater circulation system will be described with reference to FIG. 2. Based on the same configuration as the configuration of the groundwater sprinkling system 50, the small holes are not formed in the sprinkling pipe 51. Replace with a pipe and arrange so that the end of the pipe not connected to the guide pipe 52 (opened without a cap attached) is positioned above the wind guide 11 upstream of the flow of groundwater g. . The groundwater circulation system transmits the heat of the groundwater g moving to the outer surface of the wind guide 11 by forcing the groundwater g to flow into the underground G. The groundwater g led out from the end of the pipe may return to the pump pit 54, or may diffuse into the underground G and flow into the pump pit 54. As described above, the groundwater circulation system is also a system that artificially and forcibly exchanges heat between the air a in the air guide 11 and the aquifer Gb. Similarly to the groundwater sprinkling system 50 (see FIG. 2), the groundwater circulation system can be used both when the air guide 11 is embedded in the aquifer Gb and when it is not embedded.

  Further, in the geothermal heat sampling and heating systems 1 and 2 described above, the wind guide 11 is embedded in the groundwater g of the aquifer Gb, but the wind guide 11 is the groundwater g of the aquifer Gb. When not buried in the ground, it may be configured to include a water absorbing member as the groundwater heat transfer means instead of the groundwater sprinkling system 50 (see FIG. 2) or the groundwater circulation system.

  The water absorbing member 58 will be described with reference to FIG. 5A and 5B are schematic views around the air guide 11 of the system including the water absorbing member 58. FIG. 5A is a side view of the air guide 11 around which the water absorbing member 58 is wound, and FIG. It is sectional drawing of a right angle direction. The system including the water absorbing member 58 is a system for artificially exchanging heat between the air a in the air guide 11 and the underground G. The water-absorbing member 58 is a member having water-absorbing and diffusing characteristics due to capillary action, and for example, a non-woven fabric can be used. In addition to the nonwoven fabric, a highly water-absorbing polymer (such as sodium polyacrylate) may be used, and other known water-absorbing members may be used.

  The water absorbing member 58 is typically formed in a string shape and is wound around the air guide 11 in a spiral shape. The water absorbing member 58 wound around the air guide 11 is disposed so that a part thereof is immersed in the groundwater g. At this time, it is preferable that the air guide 11 around which the water absorbing member 58 is wound is disposed so as to be immersed in the groundwater g. In this way, the distance that the groundwater g moves due to the capillary phenomenon is shorter than half of the circumferential length in the cross section perpendicular to the axis of the wind guide 11, and the amount of the groundwater g that moves around the entire wind guide 11 is increased. Can do. In the case where a part of the air guide 11 is not disposed so as to be immersed in the groundwater g, the water absorbing member 58 is disposed so as to extend to be immersed in the groundwater g. The arrangement of extending the water absorbing member 58 is performed at a plurality of locations with appropriate intervals in the longitudinal direction of the air guide 11. A water absorbent member 58 capable of sucking up the groundwater g from the surface of the groundwater g to the top of the wind guide 11, whether or not a part of the wind guide 11 around which the water absorbent member 58 is wound is immersed in the ground water g. It is preferable to use it. In the present embodiment, the lower portion of the air guide 11 around which the water absorbing member 58 is wound is disposed so as to be immersed in the groundwater g, and this case will be described below as an example.

  The water absorbing member 58 operates as follows. The water absorbing member 58 wound around the air guide 11 absorbs the ground water g from the lower part of the air guide 11 (the part immersed in the ground water g), and the upper part of the air guide 11 due to the capillary phenomenon (the part not in contact with the ground water g). The water-absorbing member 58 penetrates. That is, the groundwater g moves on the outer surface of the air guide 11. When the groundwater g penetrates the water absorbing member 58, the water absorbing member 58 in the upper part of the air guide 11 is in a state where there is more moisture than the surrounding soil. Then, water permeates from the water absorbing member 58 above the air guide 11 toward the soil with less moisture. Water moves again from the lower portion of the air guide 11 to the water absorbing member 58 at the upper portion of the air guide 11 from which moisture has been removed. As described above, the groundwater g continuously moves from the lower part to the upper part of the outer surface of the air guide 11 by the capillary phenomenon in the water absorbing member 58.

  When the ground water g moves around the air guide 11, the temperature difference between the air a and the underground G, which should be reduced by heat exchange, can be prevented from becoming so small that heat exchange is not performed. Can perform heat exchange between the air a and the underground G. When the water absorbing member 58 is used as the groundwater heat transfer means, the temperature difference between the air a in the air guide 11 and the underground G can be reduced with a simple configuration as compared with the case where the groundwater sprinkling system 50 (see FIG. 2) is used. Can be maintained.

  Further, in the geothermal heat collecting and cooling systems 1 and 2 described above, in order to increase the amount of heat exchanged between the underground G and the air a flowing in the wind guide 11, the air a swirls in the wind guide 11. You may make it flow. In order to swirl the air a in the air guide 11, swirl flow inducing means is provided.

  FIGS. 6A and 6B are schematic views of a jet supply system 60 as a swirl flow generating means. FIG. 6A is a schematic diagram of the configuration, and FIG. 6B is a cross-sectional view of the air guide 11 in the direction perpendicular to the axis. In FIG. 6A, in order to facilitate understanding of the configuration, a part of the air guide 11 is notched. The jet supply system 60 connects the jet pipe 61 that supplies the jet air aj into the wind guide 11, the small fan 63 that pumps the air aj toward the jet pipe 61, and the small fan 63 and the jet pipe 61. And a connecting pipe 62.

  The jet pipe 61 is only required to be able to supply the jet air 11 with the jet air aj to which the air a flowing in the wind guide 11 is swirled. Typically, a hard polyvinyl chloride pipe of about 20A to 50A is used. . The size of the jet pipe 61 is not limited to that illustrated, and may be appropriately determined according to the diameter and length of the air guide 11 and the flow rate of the air a flowing through the air guide 11. The jet pipe 61 is formed with a plurality of small holes 61h for ejecting air aj. The small holes 61h are formed at an appropriate interval on one virtual straight line extending in the longitudinal direction of the tube. The size of the small hole 61h is preferably set such that the air aj supplied from the jet tube 61 becomes a jet. When the jet air aj is supplied into the air guide 11, the air a flowing in the air guide 11 is attracted by the jet air aj and tends to be a swirling flow.

  The jet pipe 61 is disposed in the air guide 11. The jet pipe 61 is configured such that the jet direction of the jet air aj at the position where the jet air aj derived from the small hole 61h collides with the inner wall of the wind guide 11 and the tangential direction of the inner wall of the wind guide 11 are as close as possible to each other. The small hole 61h is directed in the direction, and it is preferable that the small hole 61h is disposed at a position close to the inner wall of the air guide 11 but not in contact with the inner wall. The closer the jet pipe 61 is arranged to the inner wall of the wind guide 11, the closer the impinging direction of the jet air aj derived from the small hole 61h and the tangential direction of the inner wall of the wind guide 11 are in the same direction. Further, the more the jet pipe 61 is arranged away from the inner wall of the air guide 11, the more obstructed the flow of the air a swirling along the inner wall of the air guide 11 is achieved.

  The small fan 63 is disposed in the underground chamber 91. The small fan 63 may be a blower. A connecting pipe 62 is connected to the small fan 63. The connecting pipe 62 is typically a hard vinyl chloride pipe. The connection pipe 62 is connected to one end of the jet pipe 61. A cap (not shown) is attached to the other end of the jet pipe 61.

  In the geothermal heat collecting and cooling systems 1 and 2 (see FIGS. 1 and 4) including the jet supply system 60, the small fan 63 is also activated when the fan 12 (see FIGS. 1 and 4) is activated. Then, the air a flowing through the air guide 11 advances in the air guide 11 while turning along the inner wall of the air guide 11. When the air a flowing in the air guide 11 becomes a swirl flow along the inner wall, heat exchange between the air a and the underground G is further promoted. When the swirl flow inducing means is the jet flow supply system 60, the air a in the air guide 11 can be stably swirled.

  FIG. 7 is a partial perspective view for explaining a guide vane 68 as a swirling flow inducing means instead of the jet supply system 60 (see FIG. 6). The guide vane 68 is formed by attaching a band-shaped member on the inner wall of the air guide 11 in a spiral shape so that the width direction of the band stands on the inner wall of the air guide 11. The guide vanes 68 may be attached over the entire length of the air guide 11, or may be attached with a length and an interval so as to give a chance to turn the air a in the air guide 11.

  When the fan 12 (see FIGS. 1 and 4) is activated, the geothermal heat collection and cooling systems 1 and 2 (see FIGS. 1 and 4) including the guide vane 68 are configured to cause the air a flowing in the air guide 11 by the guide vane 68. Advances along the wind guide 11 while turning along the inner wall of the wind guide 11. When the air a flowing in the air guide 11 becomes a swirl flow along the inner wall, heat exchange between the air a and the underground G is further promoted. If the swirl flow inducing means is the guide vane 68, the system can be simplified.

  In the above description, the air guide 11 is described as being made of synthetic resin, but may be made of metal having corrosion resistance. Since a metal duct generally has a higher thermal conductivity than a synthetic resin, if it is a metallic duct, the heat exchange efficiency between the underground G and the air a is increased. The term “having corrosion resistance” refers to a property capable of suppressing the progress of corrosion to such an extent that the function can be exhibited for a predetermined period.

  In the above description, the outdoor units 22 (see FIG. 1) and 42 (see FIG. 4) have been described as being installed in the underground chamber 91, but may be installed outdoors (including the rooftop). In this case, it is preferable to provide the outlet of the air guide 11 that supplies the air a to the outdoor units 22 and 42 as close to the outdoor units 22 and 42 as possible. In addition, when a large amount of outside air is taken into the wind guide 11 when the outdoor units 22 and 42 are installed outdoors, it is preferable to take measures that allow the condensed water to be appropriately discharged from the wind guide 11 particularly in summer. .

It is a typical systematic diagram of the geothermal heat collection cooling and heating system which concerns on the 1st Embodiment of this invention. It is a schematic diagram explaining an example of a groundwater heat transfer means. (A) is a schematic diagram of the configuration, and (b) is a cross-sectional view in the direction perpendicular to the axis of the wind guide. It is a graph which shows an example of the relationship between the temperature of heat source air, and COP. (A) is a graph when air is used as a cold heat source, and (b) is a graph when air is used as a heat source. It is a typical systematic diagram of the geothermal heat collection cooling and heating system which concerns on the 2nd Embodiment of this invention. It is a schematic diagram explaining another example of a groundwater heat transfer means. (A) is a side view of the air guide around which the water absorbing member is wound, and (b) is a cross-sectional view in the direction perpendicular to the axis of the air guide. It is a schematic diagram explaining an example of a swirl flow inducing means. (A) is a schematic diagram of the configuration, and (b) is a cross-sectional view in the direction perpendicular to the axis of the wind guide. It is a schematic diagram explaining another example of a swirl flow inducing means.

Explanation of symbols

1, 2 Geothermal sampling air conditioning system 11 Wind guide 20 Heat pump chiller (air conditioning equipment)
22 Outdoor unit 40 Package type air conditioner (equipment for air conditioning)
42 Outdoor unit 50 Groundwater sprinkling system (groundwater heat transfer means)
58 Water-absorbing member (groundwater heat transfer means)
60 Jet supply system (swirl flow generating means)
68 Guide vane (means for swirling flow)
91 Basement chamber (equipment installation room)
92 Heat storage tank a Air g Ground water wm Heat transfer water GL Ground surface

Claims (5)

A wind guide buried under the ground surface and flowing air inside;
Air-conditioning equipment that introduces air that has flowed through the air guide and that performs at least one of cooling and heating of the heat medium using the air as a heat source;
Groundwater heat transfer means for transferring heat of the moving groundwater to the outer surface of the wind guide;
The groundwater heat transfer means is
Disposed along the Kazeshirube above the Kazeshirube under the ground surface, a water spray tube for sprinkling groundwater outside the surface of the wind guide,
A groundwater pump for pumping groundwater toward the sprinkling pipe,
The groundwater sprayed from the sprinkler pipe is configured to merge with the groundwater below the ground surface;
Geothermal sampling air conditioning system. Unevenness was formed on the surface of the air guide;
The geothermal heat collecting and cooling system according to claim 1. A swirl flow inducing means for swirling the air flowing in the air guide;
The geothermal heat collecting and cooling system according to claim 1 or 2. An air introduction section for taking in air as the heat source, which constitutes the air conditioning equipment, is disposed in the equipment installation chamber;
The geothermal heat collection cooling and heating system of any one of Claims 1 thru | or 3. The heat medium is water, and includes a heat storage tank for storing water whose temperature is adjusted by the air conditioning equipment;
The geothermal heat collection cooling and heating system of any one of Claims 1 thru | or 4.

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