JP6548088B2 - Air conditioning system - Google Patents

Description

  The present invention relates to an air conditioning system.

  In conventional heating systems for general buildings, the rooms are often heated directly by using a wood stove, an oil stove, a gas stove, etc. as a heat source, often resulting in temperature differences between rooms or even within a single room. It was difficult to obtain a comfortable heating environment, such as temperature differences depending on the location. With respect to such a heating system, there are central heating and floor heating, for example, to realize a comfortable temperature environment by reducing the temperature difference throughout the building. However, central heating and floor heating have problems of high energy consumption and economic burden such as fuel cost.

  As a countermeasure, Patent Document 1 discloses a heating system using a ground-heat heat pump apparatus that uses ground heat whose temperature is substantially constant throughout the year. The heating system described in Patent Document 1 heats the inside of a building by causing a floor heating panel or the like to distribute a heat medium which has been heated using a geothermal heat pump device.

JP, 2011-226660, A

  As described in Patent Document 1, a heating system using ground heat generally embeds the ground heat exchange section at a ground depth of about 100 m in order to obtain stable heat from the ground. There is a problem that it is difficult to spread to general houses because the configuration of the underground layer is restricted or the installation cost is high.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an air conditioning system having a low installation cost.

In order to solve the above-mentioned subject, the heating and cooling system of the present invention is provided with a ground heat exchange unit, a heat exchanger on a heat source side, and a heat exchanger on a load side, and an air heat pump system. And an indoor heat exchanger that circulates a heat medium heated by the ground heat heat pump device and the air heat heat pump device to exchange heat with the air in the building, and the ground heat exchange unit first latent heat storage material is accommodated, the heat medium is circulated in the first phase change material and the heat source-side heat exchanger through a piping to the inside of the first tank embedded in, ground heat The heat pump apparatus has an in-air heat exchange unit disposed on the ground in addition to the underground heat exchange unit embedded in the ground, and the second in-air heat exchange unit is disposed on the ground. The second latent heat storage material is accommodated in the tank, and the second latent heat storage material, the first latent heat storage material, and the heat exchanger on the heat source side A through pipe for circulating a heat medium, and that.

  Further, in addition to the above invention, the burial depth of the underground heat exchange section is a depth at which the underground temperature substantially the same as the annual average temperature of the area where the building is installed, and the phase displacement of the first latent heat storage material It is preferable that the point be approximately the same as the annual average temperature.

  Further, in addition to the above invention, it is preferable to make the phase shift point of the second latent heat storage material the same as the phase shift point of the first latent heat storage material.

  Further, in addition to the above invention, a flow path for circulating a heat medium through a pipe between the second latent heat storage material, the first latent heat storage material, and the heat exchanger on the heat source side, and a second It is preferable to have a dedicated flow path for circulating the heat medium between the latent heat storage material and the first latent heat storage material via a dedicated pipe.

  In addition to the above-mentioned invention, it is preferred to have a heater which heats up the 2nd latent heat storage material.

  Further, in addition to the above-described invention, it is preferable that the pipe and the dedicated pipe are made of a material having high thermal conductivity, at least a portion to be embedded in the first latent heat storage material or the second latent heat storage material.

  Further, in addition to the above invention, the indoor heat exchanger for exchanging heat between the air in the building and the heat medium is mainly an indoor heat exchanger for heating, disposed on the floor, and mainly disposed near the ceiling. It is preferable that an indoor heat exchanger for cooling be provided, and it is possible to switch and drive the indoor heat exchanger for heating and the indoor heat exchanger for cooling.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram which shows the air conditioning system which concerns on the 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is structure explanatory drawing which shows the air conditioning system which concerns on the 1st Embodiment of this invention. It is a flowchart shown about the example of operation | movement of the control part which concerns on the 1st Embodiment of this invention. It is structure explanatory drawing which shows the air conditioning system which concerns on the 2nd Embodiment of this invention. It is structure explanatory drawing which shows the air conditioning system which concerns on the 3rd Embodiment of this invention.

First Embodiment
FIG. 1 is an overall configuration diagram showing a cooling / heating system 1 according to a first embodiment. As shown in FIG. 1, the air conditioning system 1 can heat and cool, for example, the interior 41 of a building 40. In the room 41, an indoor heat exchanger 43 for heating is disposed on the floor 42, and an indoor heat exchanger 45 for cooling is disposed in the vicinity of the ceiling 44. The underground heat pump apparatus 2 and the air heat pump apparatus 4 are arrange | positioned outdoors. In the pipes L5 and L6 connected to the indoor heat exchanger 43 and the indoor heat exchanger 45, the heat medium F3 which is heated by the ground heat heat pump device 2 and the air heat heat pump device 4 and becomes a heat source for heating It is circulated. The heat medium F3 is, for example, antifreeze. In a cool area, the indoor heat exchanger 43 can be omitted and only the indoor heat exchanger 43 may be used, or both the indoor heat exchangers 43 and 45 may be used for heating, such as weather or temperature It is possible to switch and use properly depending on the situation. The geothermal heat pump apparatus 2 has a ground heat exchange unit 6 embedded in the ground and uses the ground heat as a heat collection source. The air heat pump apparatus 4 has an in-air heat exchange unit 20 described later in the description of FIG. 2 and uses air heat as a heat collection source.

  The geothermal heat pump 2 and the air heat pump 4 cooperate to raise the temperature of the heat medium F 3 to a predetermined temperature and circulate the heat medium F 3 to the indoor heat exchanger 43 and the indoor heat exchanger 45. Then, the indoor heat exchanger 43 blows and heats the warm air heated to the room 41. In addition, the indoor exchange unit 45 cools the room 41 by blowing the cooled cold air into the room 41. In addition, although the house of FIG. 1 illustrates the first floor structure, the heating and cooling system 1 is also applicable to a second floor or a third floor structure.

  FIG. 2: is structure explanatory drawing which shows the air conditioning system 1 which concerns on 1st Embodiment. As shown in FIG. 2, the cooling and heating system 1 includes a ground heat heat pump device 2, an air heat pump device 4, and indoor heat exchangers 43 and 45. Moreover, the air conditioning system 1 has the control part 5 which controls the geothermal heat pump apparatus 2, the air heat pump apparatus 4, and the indoor heat exchangers 43 and 45. As shown in FIG. The control unit 5 controls the drive of the geothermal heat pump 2, the air heat pump 4 and the indoor heat exchangers 43 and 45 based on the room temperature set by the user, and secures the flow paths of the respective heat mediums connecting them. , Has a function of controlling the flow rate and flow rate per unit time of each heat medium.

  The heat pump apparatus 2 for ground heat exchange heat between ground heat and the heat medium F in the pipe L1 to collect heat from ground heat, which is a heat source, and heat exchange on the heat source side And a heat exchanger 8 (described as a second heat exchanger 8) on the load side. The underground heat exchange unit 6 and the first heat exchanger 7 are connected by the pipe L 1, and the pump 9 is used to transfer the heat medium F between the underground heat exchange unit 6 and the first heat exchange unit 7. It is circulated in the direction of the arrow shown. As the heat medium F, an antifreeze liquid having high heat conductivity is used, but water may be used. The underground heat exchange unit 6 includes a first tank 3 embedded at a depth of 10 m to 20 m, a first latent heat storage material P accommodated in the first tank 3, and a pipe L1. The tip of the pipe L1 is disposed in the first latent heat storage material P embedded in the ground, and the heat medium F is circulated between the first latent heat storage material P and the first heat exchanger 7 Ru.

  The first latent heat storage material P stores latent heat (heat of fusion) at a phase shift point (also referred to as a phase change point) from the solid phase to the liquid phase, and latent heat at the phase shift point from the liquid phase to the solid phase ( Heat of solidification). The first latent heat storage material P includes, for example, inorganic hydrated salts such as calcium chloride hexahydrate, sodium sulfate decahydrate, sodium acetate trihydrate and the like, and organic compounds such as paraffin (paraffin-based material). In the example of the present embodiment, as the first latent heat storage material P, paraffin having a latent heat storage amount of about 130 to 250 kJ / kg, a latent heat storage amount higher than other heat storage materials, and being chemically stable I use it. The latent heat energy of paraffin is, for example, that the latent heat of solution when it shifts from the solid phase to the liquid phase is approximately 200 kJ / kg at a temperature change + 4 ° C, and the latent heat of solidification when it shifts from the liquid phase to the solid phase is It is about 240 kJ / kg (sometimes expressed as -240 kJ / kg) at 2 ° C.

  Paraffin has an advantage that the phase shift point can be widely adjusted to -20 ° C to + 50 ° C, and the phase shift point can be arbitrarily selected from them. In addition, the phase displacement point of the first latent heat storage material P (paraffin) used for the heating and cooling system 1 is approximately the annual average temperature of the area where the building 40 is installed. The underground temperature is approximately 10m to 20m in depth and roughly an average annual temperature. It is known that the underground temperature becomes higher as the depth becomes deeper than 20 m, and is approximately 15 ° C. at the depth of 100 m. In addition, the annual average temperature of Nagano City is 11.9 ° C. (statistical period 1981-2010). That is, when the cooling and heating system 1 is installed in Nagano city, it can be determined that the underground temperature is 11.9 ° C. at an annual average temperature of 11.9 ° C. at a depth of 10 to 20 m. The temperature should be about 9 ° C.

  The pipe L1 uses a resin pipe such as a cross-linked polyethylene pipe having high thermal insulation between the underground heat exchange portion 6 and the first heat exchanger 7, and the heat conduction of the copper pipe etc. in the first heat exchanger 7 High quality metal is used. Further, the portion of the pipe L1 embedded in the first latent heat storage material P is made of a material having high thermal conductivity, such as a copper pipe or stainless steel, in order to facilitate heat collection in the ground heat. Preferably. The material of the first tank 3 may be made of plastic, but a material having high thermal conductivity, stainless steel having excellent durability in the ground, or the like is more preferable. The first latent heat storage material P is charged in the first tank 3 with a margin of about 10% with respect to the volume of the first tank 3 in consideration of increase or decrease in volume accompanying temperature change.

  The first heat exchanger 7 and the second heat exchanger 8 are connected by the pipe L2, and the pipe L2 is filled with HFC (substituted fluorocarbon gas) or HC (non-fluorocarbon gas) as the heat medium F2, and the arrow shown in the figure It is circulated in the direction. The first compressor 10 is disposed upstream of the second heat exchanger 8, and the first expansion valve 11 is disposed downstream of the second heat exchanger 8. The first compressor 10 compresses and raises the temperature of the heat medium F2. The first expansion valve 11 is a so-called evaporator, and lowers the temperature of the heat medium F2 heated by the first compressor 10. By heat exchange between the heat medium F2 heated by the first compressor 10 and the heat medium F3, the temperature of the heat medium F3, which is a heating medium for the building 40, is increased. The heat transfer medium F is cooled and returned to the ground as a heat transfer medium having a temperature close to the ground temperature. The heat medium F returned to the ground is collected by the heat exchange action of the underground heat exchange unit 6 through the first latent heat storage material P, but the phase displacement action of the first latent heat storage material P The temperature is maintained constant until phase displacement, and the latent heat during that time is stored.

  The second heat exchanger 8 and the indoor heat exchangers 43 and 45 are connected by pipes L3 and L4. The indoor heat exchangers 43 and 45 have the indoor heat exchanger 43 for heating and the indoor heat exchanger 45 for cooling, respectively, and the piping L5 on the indoor heat exchanger 43 side and the indoor heat exchanger 45 side from the piping L3 respectively The heat medium F3 is diverted to the pipe L6 of The pipes L5 and L6 are made of resin such as cross-linked polyethylene pipe or metal such as copper pipe. Further, as the heat medium F 3, an antifreeze liquid or water is used in the same manner as the heat medium F. The pipe L3 may be referred to as a forward pipe L3 because the heat medium F3 is fed to the indoor heat exchangers 43 and 45. On the other hand, the pipe L4 may be described as a return pipe L4 because the heat medium F3 is returned from the indoor heat exchangers 43, 45 to the second heat exchanger 8 side.

  The pump 15, the check valve 16, and the outgoing pipe header 17 are connected to the outgoing pipe L3 in this order from the second heat exchanger 8 side. The pump 15 feeds the heat medium F3 in a direction indicated by an arrow at a predetermined flow rate and a flow rate per predetermined unit time. The check valve 16 has a function of preventing the heat medium F3 from flowing backward from the heat storage material heat exchanger 3 side to the second heat exchanger 8 side. Then, the outgoing pipe header 17 branches and sends the heat medium F3 sent to the outgoing pipe L3 to each of the pipes L5 and L6 at substantially the same flow velocity and flow rate. Further, a return pipe header 18 is connected to the return pipe L4. The return pipe header 18 collects the heat medium F3 returned from the indoor heat exchangers 43 and 45, and returns it to the second heat exchanger 8 with the flow rate condition being approximately the same as the flow rate condition of the forward pipe L3. Here, when the pipes L3 to L6 are cross-linked polyethylene pipes, if the return header 17 and the return pipe header 18 are set to be sheath headers, it is possible to easily carry out the pipes. Moreover, the temperature sensor 19 which detects the temperature of the heat medium F3 is arrange | positioned at the return pipe L4. The temperature sensor 19 detects the temperature of the heat medium F3 in the return flow path from the indoor heat exchangers 43 and 45, and this temperature may be referred to as the return heat medium temperature.

  The heating and cooling system 1 includes an air heat pump 4 in addition to the geothermal heat pump 2. The air heat pump apparatus 4 includes an in-air heat exchange unit 20 and a third heat exchanger 21. The in-air heat exchange unit 20 operates as an evaporator. The in-air heat exchange unit 20 and the third heat exchange unit 21 are connected by a pipe L7. The heat medium F4 is filled in the pipe L7. The heat medium F4 is the same as the heat medium F2, such as HFC (replacement fluorocarbon gas) or HC (non-fluorocarbon gas), and is circulated in the direction indicated by the arrow. A second compressor 22 is disposed upstream of the third heat exchanger 21, and a second expansion valve 23 is disposed downstream of the third heat exchanger 21. The pipe L7 is made of a metal such as a copper pipe having a high thermal conductivity.

  The second compressor 22 compresses and heats the fourth heat medium F4. The second expansion valve 23 is a so-called evaporator, and lowers the temperature of the fourth heat medium F4 heated by the second compressor 22. The heat medium F4 heated by the second compressor 22 heats the heat medium F3 by heat exchange with the heat medium F3 on the building 40 side. In addition, the second expansion valve 23 reduces the temperature of the heated fourth heat medium F4. The in-air heat exchange unit 20 has a function of collecting heat from the outside air. The heat medium F3 heated by the second heat exchanger 8 is circulated to the third heat exchanger 21 through the pipe L8. The heat medium F3 further heated by the heat exchange function of the third heat exchanger 21 is fed through the pipe L9.

  The heat medium F3 sent from the second heat exchanger 8 flows between the pump 15 and the check valve 16 toward the indoor heat exchangers 43, 45 and toward the third heat exchanger 21. It branches at the branch part 24. A three-way valve or the like is disposed at the branch portion 24. Further, the heat medium F3 fed from the third heat exchanger 21 is joined to the forward pipe L3 at the joining portion 25 between the check valve 16 and the forward pipe header 17. A three-way valve or the like is disposed in the merging portion 25. A check valve 16 is disposed between the junction portion 25 and the branch portion 24 of the forward pipe L3, and the second heat exchanger 8 side and the third heat exchanger 21 side are arranged from the indoor heat exchangers 43 and 45 side. The heat medium F3 is prevented from flowing backward toward the

  The pump 26, the thermal valve 27, and the constant flow valve 28 are connected to the pipe L9 in order from the third heat exchanger 21 side. The pump 26 feeds the heat medium F3 divided at the branch portion 24 in the direction of the arrow in the drawing. The thermal valve 27 has a function of stopping the flow or the flow of the heat medium F3 transferred from the third heat exchanger 21 by opening and closing the pipe L9. Moreover, the constant flow valve 28 has a function of controlling the flow rate of the heat medium F3 from the third heat exchanger 21 joining the forward pipe L3. The flow rate per unit time of the heat medium F3 sent from the third heat exchanger 21 is smaller than the flow rate of the heat medium F3 sent from the second heat exchanger 8. The forward pipe header 17 mixes the heat medium F3 fed from both the second heat exchanger 8 and the third heat exchanger 21 into the indoor heat exchanger 43 for heating and the indoor heat exchanger 45 for cooling. It diverts. The flow rate per unit time of the heat medium F3 flowing through the indoor heat exchanger 43 and the indoor heat exchanger 45 is substantially the same by the action of the forward pipe header 17.

  The control unit 5 controls the operation of the geothermal heat pump apparatus 2, the heat storage material heat exchanger 3, and the air heat pump apparatus 4. In the underground heat pump 2, the drive control of the pump 9 and the drive control of the first compressor 10 and the first expansion valve 11 are performed. In addition, the pump 9 selects what has a lift which can send the 1st heat medium F1 from the deepest part under the ground to the 1st heat exchanger 7. As shown in FIG. The control unit 5 controls the temperature rise of the second heat exchanger 8 based on the temperature of the return heat medium detected by the temperature sensor 19. Further, the control unit 5 performs drive control of the pump 15. The pump 15 controls the flow rate and the flow rate per unit time of the heat medium F3 sent to the indoor heat exchangers 43 and 45. The operation panel (not shown) is disposed in the room 41 of the building 40, and performs settings such as room temperature. The setting of the room temperature may be input by a remote control or the like.

  Further, the control unit 5 controls the driving of the second compressor 22 and the second expansion valve 23 in the air heat pump device 4. The second compressor 22 is driven when the temperature of the return heat medium is equal to or lower than the predetermined temperature even when the geothermal heat pump device 2 performs the temperature raising operation of the heat medium F3, and the pump 26 is simultaneously driven. At this time, the thermal valve 27 is released, and the heat medium F3 heated by the third heat exchanger 21 is sent out toward the merging portion 25. When the third heat exchanger 21 is not driven, the three-way valve of the branch portion 24 is controlled to continue the flow of the heat medium F3 from the second heat exchanger 8 side toward the heat storage material heat exchanger 3. The heat medium F3 is not fed to the heat exchanger 21 side. When the third heat exchanger 21 is driven, the three-way valve of the branch portion 24 is completely released or a predetermined amount is released, and the heat medium F3 is the heat storage material from both the second heat exchanger 8 and the third heat exchanger 21 It is sent to the heat exchanger 3.

  When only the indoor heat exchanger 43 for heating is operated, the forward pipe header 17 is controlled so that the heat medium F3 is fed to the indoor heat exchanger 43 only. When only the indoor heat exchanger 452 for cooling is operated, the forward pipe header 17 is controlled to supply the heat medium F3 to only the indoor heat exchanger 45, and both indoor heat exchangers are operated (for example, heating) In the latter case, all the forward pipe headers 17 are released and the heat medium F3 is fed to both the indoor heat exchangers 43 and 45.

  In the room 41, an indoor temperature sensor 29 for detecting the temperature of the room to be heated is installed. When there is a difference from the room temperature detected with respect to the set room temperature, the control unit 5 drives and controls the geothermal heat pump device 2 and the air thermal heat pump device 4 to raise or lower the temperature.

  In the present embodiment, for example, the deliverable flow rate of the pump 26 of the thermal air heat pump device 4 is made smaller than the deliverable flow rate of the pump 15 of the geothermal heat pump device 2. This is because, when the thermal valve 27 is in the open state, a part of the heat medium F3 sent from the geothermal heat pump device 2 is caused to flow to the air heat pump device 4. For example, when the deliverable flow rate of the pump 15 is 15 liters per minute, the deliverable flow rate of the pump 26 can be 5 liters per minute, or the like. The flow rate of the heat medium F3 flowing to the air heat pump 4 can be controlled by the degree of opening and closing of the three-way valve of the branch unit 25.

  FIG. 3 is a flowchart showing an embodiment of the operation of the control unit 5. It is assumed that a temperature desired by the user is set in the control unit 5 by an operation from an operation panel (not shown). As an example of the set temperature, it is assumed here that the user sets the room temperature to 20 ° C. Further, at this time, the control unit 5 prestores information on a suitable return heat medium temperature with respect to the set temperature of room temperature in a memory (not shown), and automatically sets the return heat medium temperature. The information stored in the memory described above is acquired by a manufacturer of the air conditioning system 1 through an experiment, a simulation, or the like. Alternatively, the user may optionally set both the room temperature and the return hot water temperature.

  Further, it is assumed that the measurement result of the return heat medium temperature from the temperature sensor 19 and the measurement result of the indoor temperature to be heated from the indoor temperature sensor 29 are transmitted to the control unit 5. Here, in the condition of "START", power is supplied to the indoor heat exchanger 43, the ground heat heat pump device 6, and the air heat heat pump device 4, and a difference occurs between the set temperature and the indoor temperature. To Note that the indoor heat exchanger 43 is a hot air blower, and it is assumed that air is blown when power is supplied.

  In step S10, the control unit 5 determines the difference between the measurement result of the indoor temperature sensor 29 and the set temperature. If it is determined in step S10 that the difference between the set temperature and the room temperature is large, the flow proceeds to step S11. On the other hand, if it is determined in step S10 that the difference between the set temperature and the room temperature is not large, the flow proceeds to step S12. Here, "the difference between the set temperature and the room temperature is large" is a temperature difference such that the room temperature can not be raised to the set temperature only by the heat quantity of the geothermal heat pump device 6, for example, the room temperature In this case, the temperature is higher than 5 ° C. and lower than the set temperature. In step S11, the control unit 5 drives the air heat pump apparatus 7 together with the geothermal heat pump apparatus 6, and the flow proceeds to step S12.

  As described above, in the case of “the difference between the set temperature and the room temperature is large”, by driving the air heat heat pump device 7 together with the ground heat heat pump device 6, compared to the case of driving only the ground heat heat pump device 6 Thus, a large amount of heat can be given to the heat medium F3 (the temperature of the heat medium F3 can be raised), and the indoor temperature can be easily brought closer to the set temperature.

  In step S12, the control unit 5 determines the difference between the set temperature and the room temperature. If it is determined in step S12 that the difference between the set temperature and the room temperature is medium, the flow proceeds to step S13. On the other hand, if it is determined in step S12 that the difference between the set temperature and the room temperature is not medium, the flow proceeds to step S14. Here, “the difference between the set temperature and the room temperature is medium” is a temperature difference that can raise the room temperature to the set temperature only by the heat quantity of the geothermal heat pump device 6, and, for example, It is a case where a difference with indoor temperature is less than 5 ° C. In step S13, the control unit 5 drives only the geothermal heat pump device 6, and the flow proceeds to step S14.

  In step S14, the control unit 5 determines the difference between the set temperature and the room temperature. If it is determined in step S14 that there is no difference between the set temperature and the room temperature, the flow proceeds to step S15. On the other hand, if it is determined in step S14 that there is a difference between the set temperature and the room temperature, the flow returns to step S10. Here, “there is no difference between the set temperature and the room temperature” assumes, for example, a case where the difference between the set temperature and the room temperature is within 1 ° C.

  In step S15, the control unit 5 stops the geothermal heat pump device 6 and the air heat pump device 7 (END).

  The process of the flowchart of FIG. 3 is started once the condition of “START” is established even after the process ends (END). That is, when the difference between the set temperature and the room temperature disappears and the difference between the set temperature and the room temperature decreases after the process of the flowchart of FIG. 3 ends, the process of the flowchart of FIG. 3 is started again. As described above, according to the process of the flowchart shown in FIG. 3, since the control can be performed based on only the measurement result of the indoor temperature sensor 29, the process can be performed easily. The flow in the case of cooling the room 41 can be described by following the operation flow of the control unit 5 for heating and replacing the case where the room temperature is higher than the set temperature.

  The heating and cooling system 1 according to the first embodiment described above includes the underground heat exchange device 6 including the underground heat exchange unit 6, the first heat exchanger 7 on the heat source side, and the heat exchanger 8 on the load side. , And an indoor heat exchanger 43, 45 that circulates heat medium F3 heated by ground heat heat pump device 2 and air heat heat pump device 4 and exchanges heat with air in building 40; Have. In the underground heat exchange unit 6, the first latent heat storage material P is accommodated inside the first tank 3 embedded in the ground, and the latent heat storage material and the heat exchanger on the heat source side are connected via piping. The heat medium F3 is circulated.

  The first latent heat storage material P stores latent heat (heat of fusion) at a phase displacement point from the solid phase to the liquid phase, and dissipates latent heat (heat of solidification) at the phase displacement point from the liquid phase to the solid phase. By using this latent heat as a heat source, the depth of the underground heat exchange section 6 is about 100 m, and even if the underground heat exchange part 6 is shallowed to a depth of 10 m to 20 m, the depth is 100 m The ground heat collecting effect equivalent to the conventional example is obtained. Therefore, the drilling cost can be reduced to one tenth to a few tenths.

  Further, the burial depth of the underground heat exchange portion 6 is a depth at which the underground temperature substantially the same as the average annual temperature of the area where the building 40 is installed, and the phase displacement point of the first latent heat storage material P is Make it almost the same as the annual average temperature. The depth at which the underground temperature is almost the same as the annual average temperature is 10m to 20m. Therefore, by making the phase displacement point of the first latent heat storage material P approximately the same as the annual average temperature, latent heat can be efficiently stored by phase displacement from the solid phase to the liquid phase and from the liquid phase to the solid phase.

Second Embodiment
Next, an air conditioning system 50 according to a second embodiment will be described with reference to FIG. The geothermal heat pump apparatus 2 described in the first embodiment includes the underground heat exchange unit 6 embedded in the ground, but in the second embodiment, the underground heat exchange unit 6 In addition to the above, it is different in having an in-air heat exchange unit 52 disposed on the ground. The differences from the first embodiment will be mainly described below. The same parts as in the first embodiment will be described with the same reference numerals as in FIG.

  FIG. 4: is structure explanatory drawing which shows the air conditioning system 50 which concerns on 2nd Embodiment. As shown in FIG. 4, the geothermal heat pump apparatus 50 has a ground heat exchange unit 6 embedded in the ground and an in-air heat exchange unit 52 disposed on the ground. The in-air heat exchange unit 52 includes a second tank 53 disposed on the ground, and the second tank 53 contains a second latent heat storage material P2. The underground heat exchange unit 6 and the in-air heat exchange unit 52 are connected by a pipe L1. The pipe L1 is embedded in the first latent heat storage material P and the second latent heat storage material P2, and is connected to the first heat exchange unit 7. The heat medium F is circulated through the pipe L1. The configuration of the underground heat exchange unit 6 is the same as that of the first embodiment.

  The heat pump apparatus 51 performs heat exchange between ground heat and the heat medium F by the ground heat exchange unit 6 to collect ground heat which is a heat source. However, in the configuration without the in-air heat exchange unit 52, the ground temperature around the first tank 3 may decrease due to the heat exchange (heat collection), and the heat medium F can not sufficiently collect heat from the ground. There is a case. In such a case, the in-air heat exchanger 52 performs heat exchange between the heat medium F and the in-air heat exchange unit 52, collects latent heat due to phase displacement of the second latent heat storage material P2, and raises its temperature By circulating the heat medium F thus obtained into the first latent heat storage material P of the underground heat exchange unit 6, the temperature rise of the underground heat exchange unit 6 is compensated. Therefore, it is preferable to make the phase displacement point of the second latent heat storage material P2 the same as or higher than that of the first latent heat storage material P. Further, paraffin is used as the second latent heat storage material P2 in the same manner as the first latent heat storage material P.

  As explained above, in addition to the underground heat exchange section 6 buried in the ground, the underground heat pump apparatus 51 has the in-air heat exchange section 52 disposed on the ground. In the in-air heat exchange unit 52, the second latent heat storage material P2 is accommodated in the second tank 53 disposed on the ground, and the second latent heat storage material P2 and the first latent heat storage material P The heat medium F is circulated through the piping to the first heat exchanger 7 on the heat source side. As described above, by providing the in-air heat exchange unit 52, the heat medium F heated by the outside air on the ground is circulated in the first latent heat storage material P of the underground heat exchange unit 6 to perform the first latent heat storage. Heat exchange can be performed between the heat storage material P and the heat medium F, and the heat collection of the heat medium F can be stably maintained.

  Further, the phase displacement point of the second latent heat storage material P2 is substantially the same as the phase displacement point of the first latent heat storage material P in the ground. In this way, the temperature of the heat medium F circulating through the pipe L1 can be maintained substantially constant.

Third Embodiment
Next, an air conditioning system 60 according to a third embodiment will be described with reference to FIG. The heat pump apparatus 50 according to the second embodiment described above includes the ground heat exchange unit 6 and the in-air heat exchange unit 51, and the ground heat exchange unit 6 and the in-air heat exchange unit 52. And the flow path which circulates the heat medium F with piping L1 between the 1st heat exchangers 7 is provided. The third embodiment is different from the first embodiment in that a dedicated flow path for circulating the heat medium F between the underground heat exchange portion 6 and the in-air heat exchange portion 52 is provided in addition to the flow path. Therefore, differences from the second embodiment will be mainly described. The same parts as in the second embodiment will be described with the same reference numerals as in FIG.

  FIG. 5: is structure explanatory drawing which shows the air conditioning system 60 which concerns on 3rd Embodiment. As shown in FIG. 5, the geothermal heat pump apparatus 61 has a ground heat exchange unit 6 embedded in the ground and an in-air heat exchange unit 52 disposed on the ground. The in-air heat exchange unit 52 includes a second tank 53 disposed on the ground, and the second latent heat storage material P2 is accommodated in the second tank 53. The pipe L1 passes through the inside of the first latent heat storage material P on the ground side and the second latent heat storage material P2 on the ground side, is connected to the first heat exchanger 7, and a flow path through which the heat medium F is circulated. Have.

  In addition, the geothermal heat pump 61 is provided with a dedicated pipe L10 connecting the ground heat exchange unit 6 and the in-air heat exchange unit 52, and the first latent heat storage material P on the ground side and the ground side are provided. The heat medium F is circulated in the dedicated pipe L10 through the second latent heat storage material P2 of the second embodiment. This dedicated flow path is a flow path independent of the pipe L1, is embedded in the first latent heat storage material P and the second latent heat storage material P2, and the underground heat exchange unit 6 and the in-air heat exchange unit 52 The heat medium F is circulated to both. A pump 62 for circulating the heat medium F is disposed in the middle of the flow path of the dedicated pipe L10. The dedicated pipe L10 is a closed circuit in which the heat medium F is circulated between the underground heat exchange unit 6 and the in-air heat exchange unit 52.

  The pump 62 is driven and controlled by the control unit 5. Even when the heat medium F is circulated in the flow path of the pipe L1, the pump 62 is driven when the temperature in the room is large with respect to the set temperature. The dedicated flow path heats the heat medium F in the dedicated pipe L10 by heat exchange with the ground heat via the first latent heat storage material P in the ground heat exchange unit 6, and the air heat exchange unit 52 A circulation flow path is formed such that the heat medium F in the dedicated pipe L10 is heated up and returned to the underground heat exchange unit 6 by heat exchange with air heat through the latent heat storage material F.

  As described above, the cooling and heating system 60 circulates the heat medium F between the second latent heat storage material P2, the first latent heat storage material P, and the heat exchanger 7 on the heat source side via the pipe L1. And a dedicated passage for circulating the heat medium F between the second latent heat storage material P2 and the first latent heat storage material P via the second pipe L2. For example, even if the heat medium F is circulated through the pipe L1 as in the second embodiment, the first latent heat storage material P in the ground and the ground (in the air) can not be reached if the set temperature is not reached. The heat medium F is circulated through the pipe L10 (dedicated flow path) between the second latent heat storage material P2 and the heat medium F is supplied to the first heat exchanger 7 by making the flow paths of the heat medium F into two systems. It becomes possible to stably maintain F at a predetermined temperature.

(Modification of the third embodiment)
Next, a modification of the third embodiment will be described with reference to FIG. The air conditioning system 60 according to this modification includes a heater 63 in the second tank 53, that is, in the second latent heat storage material P2. The heater 63 raises the temperature of the second latent heat storage material P2. The heater 63 is, for example, an infrared heater, and is controlled to substantially the same temperature as the phase displacement point of the second latent heat storage material P2. Even if the heating medium 63 drives the underground heat exchange unit 6 and the in-air heat exchange unit 52, and the heat medium F is further circulated in the dedicated pipe L10, the difference in the indoor temperature with respect to the set temperature is still When it is determined that the second latent heat storage material P2 is determined to be large, the heat energy is supplied from the heater 63 to the second latent heat storage material P2, and the heat collection of the underground heat exchange unit 6 is complemented.

  The latent heat storage material has an almost constant underground temperature, absorbs heat of melting when it shifts from the solid phase to the liquid phase, and releases solidification heat when it shifts from the liquid phase to the solid phase. Therefore, the heater 63 may be intermittently energized for a short time, and the power consumption of the heater 63 can be suppressed. The heater 63 is turned on by the control unit 5 when the room temperature difference with respect to the set room temperature is equal to or more than a predetermined difference, and turned off by the control unit 5 when the difference disappears.

  The underground heat pump apparatus 61 according to the modification of the third embodiment described above is provided with a heater for raising the temperature of the second latent heat storage material P2. The heating heater 63 is driven when it is determined that the difference in room temperature is large with respect to the set temperature, and is provided to supplement the heat collection of the underground heat exchange unit 6. By providing the heating heater 63 to supplement the heat energy to the first latent heat storage material P and the second latent heat storage material P2, the ground temperature has a large difference from the predetermined set temperature, or the temperature fluctuation is large. It is possible to maintain a comfortable indoor temperature even at places. In addition, from this, even if the underground heat exchange section is installed at a shallow depth than conventional, or there is a difference in underground temperature with respect to the annual average temperature depending on the building installation location Even in this case, energy saving air conditioning can be realized.

  In the first to third embodiments described above, portions of the pipe L1 and the dedicated pipe L10 embedded in the first latent heat storage material P or the second latent heat storage material P2 are copper It is made of a material with high thermal conductivity such as a tube. By doing this, the efficiency of heat exchange between the heat medium F and the first latent heat storage material P and the second latent heat storage material P2 in the pipe L1 and the dedicated pipe L10 can be enhanced. The pipe L1 and the dedicated pipe L10 are preferably made of crosslinked polyethylene or the like having high thermal insulation outside the first latent heat storage material P and the second latent heat storage material P2.

  Moreover, the indoor heat exchangers that exchange heat between the air in the building 40 and the heat medium F3 of the above-described air conditioning and heating systems 1, 50, 60 are disposed mainly on the floor 42, and the indoor heat exchangers 43 for heating mainly. And the indoor heat exchanger 45 mainly for cooling disposed near the ceiling 44, and it is possible to switch and drive the indoor heat exchanger 3 for heating and the indoor heat exchanger 45 for cooling There is. In this way, when the air temperature is low, the indoor heat exchanger 43 is switched to the indoor heat exchanger 45 when the air temperature is high, and when both the air temperature is low, both the indoor heat exchanger 43 and the indoor heat exchanger 45 are operated. By doing so, it is possible to obtain a comfortable room temperature environment throughout the year.

  Note that the present invention is not limited to the above-described embodiment, and modifications, improvements, and the like as long as the object of the present invention can be achieved are included in the present invention. For example, the in-air heat exchange unit 52 disposed on the ground may be connected to a separately disposed solar heat exchanger to raise the temperature of the second latent heat storage material P2. In this case, the phase displacement point of the second latent heat storage material P2 is preferably set higher than the underground temperature. Moreover, although the example which arrange | positions the heater 63 is described in the modification of 3rd Embodiment, it is good also as a power supply of the heater 63 providing a solar panel.

  In the first to third embodiments, an example is described in which one indoor heat exchanger 43, 45 is provided, but when the room 41 has a large area, etc. It is also possible to increase the number of indoor heat exchangers 43, 45 installed.

1 ... Air conditioning system (first embodiment)
DESCRIPTION OF SYMBOLS 2 ... Geothermal heat pump apparatus 3 ... 1st tank 4 ... Air heat heat pump apparatus 6 ... Ground heat exchange part 7 ... 1st heat exchanger (heat exchanger by the side of a heat source)
8 ... 2nd heat exchanger (heat exchanger on the load side)
20: In-air heat exchange unit (first embodiment)
DESCRIPTION OF SYMBOLS 40 ... Building 41 ... Interior 42 ... Floor 44 ... Ceiling 43, 45 ... Indoor heat exchanger 50 ... Air-conditioning system (2nd embodiment)
51 Geothermal heat pump apparatus (second embodiment)
52 ··· Air heat exchange section (second embodiment)
53 ... 2nd tank 60 ... air-conditioning system (3rd embodiment)
61 Geothermal heat pump apparatus (third embodiment)
63 ... heating heater L1 ... piping (ground heat exchange unit)
L10: Dedicated piping F: Heat medium P: First latent heat storage material P2: Second latent heat storage material

Claims (7)

Ground heat pump apparatus comprising a ground heat exchange unit, a heat exchanger on the heat source side, and a heat exchanger on the load side,
An air heat pump system,
An indoor heat exchanger that circulates a heat medium heated by the ground heat pump and the air heat pump and exchanges heat with air in a building;
Have
In the underground heat exchange unit, a first latent heat storage material is accommodated inside a first tank buried in the ground,
The heat medium is circulated between the first latent heat storage material and the heat exchanger on the heat source side via a pipe,
The geothermal heat pump apparatus has an in-air heat exchange unit disposed on the ground in addition to the ground heat exchange unit embedded in the ground;
The second latent heat storage material is accommodated in the second tank disposed on the ground in the in-air heat exchange unit,
The heat medium is circulated through the pipe to the second latent heat storage material, the first latent heat storage material, and the heat exchanger on the heat source side,
An air conditioning system characterized by In the air conditioning system according to claim 1,
The burial depth of the underground heat exchange section shall be the depth at which the underground temperature will be approximately the same as the annual average temperature of the area where the building is installed,
The phase displacement point of the first latent heat storage material is approximately the same as the annual average temperature,
An air conditioning system characterized by In the air conditioning system according to claim 1 or 2 ,
The phase displacement point of the second latent heat storage material is substantially the same as the phase displacement point of the first latent heat storage material,
Air conditioning system characterized by. In the air conditioning system according to claim 1 or 2 ,
A flow path for circulating the heat medium through the pipe between the second latent heat storage material, the first latent heat storage material, and the heat exchanger on the heat source side;
A dedicated flow path for circulating the heat medium between the second latent heat storage material and the first latent heat storage material via dedicated piping;
have,
An air conditioning system characterized by In the air conditioning system according to claim 4 ,
A heater for elevating the temperature of the second latent heat storage material is provided.
An air conditioning system characterized by In the air conditioning system according to claim 4 ,
In the pipe and the dedicated pipe, a portion to be embedded in the first latent heat storage material or the second latent heat storage material is made of a material having high thermal conductivity.
An air conditioning system characterized by In the air conditioning system according to claim 1,
The indoor heat exchanger is composed mainly of a heating indoor heat exchanger disposed on the floor and a cooling indoor heat exchanger disposed near the ceiling,
It is possible to switch and drive the indoor heat exchanger for heating and the indoor heat exchanger for cooling.
An air conditioning system characterized by

Images