JP2014211256A - Air conditioning system using waste heat of supplied hot water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning system using waste heat from hot water supply, capable of being provided at a smaller number of components, effectively collecting heat of hot water drained from a hot water utilization part in a building to a waste water tank together with underground heat, and using the collected heat for heating.SOLUTION: A drainage water pipe 31 connected to a hot water utilization part (a bathtub 30) in a building 3 is buried in the ground to be proximate to an underground heat exchange means (heat transport fluid storage pipe 16), so that a heat transport fluid of the underground heat exchange means (heat transport fluid storage pipe 16) can be heated with waste heat of hot water drained through the drainage water pipe 31.

Description

  The present invention relates to a hot water supply exhaust heat utilization air conditioning system that utilizes the heat of hot water used in a building for air conditioning.

  In buildings and the like, generally hot water supplied from a hot water supply device to a hot water pipe of a bathtub or sink is used and then drained from the drain pipe to the outside of the building. There is known an air conditioning system that uses the heat of the drained hot water for air conditioning in a building (see, for example, Patent Document 1).

  In this air conditioning system, a hot water heat storage tank is provided in the under-floor space of a building, and when the remaining hot water from the bathtub is drained, the heat of the remaining hot water is stored in the hot water heat storage tank. In this air conditioning system, the ventilation fan is operated to supply air into the underfloor space, the air is warmed with heat stored in the hot water heat storage tank, and then the warmed air is supplied into the building. It is used to heat the building.

  Furthermore, in this air conditioning system, the underground heat recovery pipe is buried vertically in the ground, and the air heated by the underground heat through the underground heat recovery pipe is supplied to the underfloor space. Heat recovery heat is also used for heating in the building.

JP2012-172966

  However, in this air conditioning system, a hot water heat storage tank for storing the exhaust heat of the remaining hot water in the bathtub (hot water utilization section) is provided separately from the underground heat recovery pipe, which increases the number of parts and increases the cost. There's a problem.

  In addition, this air conditioning system has a drainage pipe that drains the remaining hot water from the bathtub directly into the drainage channel without supplying it to the hot water heat storage tank. There is also a problem that the number of parts increases.

  In view of this, the present invention has a small number of parts, and can effectively recover the heat of hot water drained from the hot water use section in the building to the sewage tank together with the underground heat, and use the recovered heat for heating. The object is to provide a heat-utilizing air conditioning system.

  In order to achieve this object, the present invention provides a hot water supply / exhaust heat use air conditioning system that uses exhaust heat of hot water drained from a hot water use section in a building to the outside of the building, wherein the air conditioner is embedded in the ground. Ground heat exchange means, a heat pump that uses the heat of the refrigerant heat-exchanged in the first heat exchange unit for air conditioning in the building in the second heat exchange unit, the first heat exchange unit, and the underground A circulation pipe connected to the first heat exchanging unit and the underground heat exchange means so that a heat transfer fluid can be circulated between the heat exchange means and the heat transfer fluid via the circulation pipe; A circulation pump that circulates between the first heat exchanging unit and the underground heat exchanging means, and a drain pipe connected to the hot water utilization unit is brought close to the underground heat exchanging means and the underground The underground heat exchanging means by the exhaust heat of hot water buried in the drain pipe and drained in the drain pipe And it is provided with heat-carrying fluid to be heated.

  According to this configuration, with a small number of parts, the heat of hot water drained from the hot water utilization part in the building to the outside of the building can be effectively recovered together with the underground heat, and the recovered heat can be used for heating.

It is a schematic explanatory drawing of Example 1 of the hot water supply waste heat utilization air-conditioning system which concerns on this invention. It is a piping system diagram of the hot water supply exhaust heat utilization air conditioning system shown in FIG. It is a schematic explanatory drawing of Example 2 which shows the relationship between the drainage pipe shown in FIG. 1, and a heat conveyance fluid storage pipe. It is a schematic explanatory drawing of Example 3 which shows the relationship between the drainage pipe shown in FIG. 1, and a heat conveyance fluid storage pipe. It is a schematic explanatory drawing of Example 4 which shows the relationship between the drainage pipe shown in FIG. 1, and a heat conveyance fluid storage pipe.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Example 1
[Constitution]

  FIG. 1 is a schematic explanatory diagram of Embodiment 1 of a hot water supply exhaust heat utilization air conditioning system according to the present invention. In FIG. 1, a flat solid base 2 is provided on the ground 1. Here, the ground 1 includes the ground surface 1a and the ground (underground part) 1b below the ground surface 1a.

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

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

  Moreover, in the building 3, the bathtub 30 installed on the floor part 3a is arrange | positioned as a hot water utilization part. Hot water from a hot water supply device (not shown) is supplied to the bathtub 30. In addition, the remaining hot water in the bathtub 30 is drained to the sewage tank 33 through the drain pipe 31 and the on-off valve 32.

  The drain pipe 31 includes a hot water discharge pipe portion 31a connected to the bottom of the bathtub 30 and a heat radiating pipe portion 31b connected to the hot water discharge pipe portion 31a. The heat radiating pipe portion 31b is embedded in the ground immediately below the solid foundation 2 in close proximity to the solid foundation 2, and is inclined downward at a gentle angle from the hot water discharge pipe portion 31a toward the sewage basin 33. Yes. An opening / closing valve 32 is interposed between the lower end of the heat radiating pipe portion 31 b and the sewage basin 33. As this on-off valve 32, an electromagnetic valve or the like is used.

  Thereby, the remaining hot water of the bathtub 30 is drained to the sewage tank 33 through the drain pipe 31 and the on-off valve 32. The sewage basin 33 is embedded in the ground in the vicinity of the side opposite to the side where the bathtub 30 of the building 3 is disposed.

  In the building 3, a controller 34 that controls the opening / closing of the opening / closing valve 32 is provided. The controller 34 includes a control unit 34a that controls opening / closing of the on-off valve 32, and a switch 34b connected to the control unit 34a. And the control part 34a controls opening / closing of the on-off valve 32 to the switch 34b.

  Further, the temperature of the heat radiating pipe portion 31b of the drain pipe 31 is detected by the temperature sensor 35, and the discharge of the remaining hot water from the bathtub 30 is detected by the drain sensor 36 provided at the lower end of the heat radiating pipe portion 31b. The temperature detection signal from the temperature sensor 35 and the drainage detection signal from the drainage sensor 36 are input to the control unit 34a.

  The control unit 34 a controls the opening / closing of the on-off valve 32 based on the drainage detection signal from the drainage sensor 36 and the temperature detection signal from the temperature sensor 35.

  Furthermore, the building 3 is provided with a heat pump system 6 as an air conditioner that uses the underground heat and the exhaust heat of the remaining hot water in the bathtub 30. As shown in FIG. 1, the heat pump system (heat pump) 6 includes a heat pump unit 7 installed outside in the vicinity of the building 3, an underfloor radiator 8 installed on the bottom plate 2 a of the solid foundation 2, and the heat pump First and second connection pipes 9 and 10 for connecting the unit 7 and the underfloor radiator 8 are provided.

  As shown in FIG. 2, the underfloor radiator 8 includes a condenser (heat radiating portion) 8a and a blower fan 8b that blows air to the condenser 8a. In the first and second connection pipes 9 and 10, a refrigerant flow path for circulating the refrigerant from the heat pump unit 7 to the underfloor radiator 8 is formed.

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

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

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

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

  In FIG. 1, a heat pump system 6 that is an air conditioner has a heat transfer fluid storage pipe 16. This heat transfer fluid storage pipe 16 is positioned directly under the bottom plate 2a of the solid foundation 2 and is buried horizontally in the underground 1b. The heat transfer fluid storage pipe 16 is disposed at a position close to the bottom plate 2a, and the heat radiating pipe portion 31b of the drain pipe 31 described above is disposed between the heat transfer fluid storage pipe 16 and the bottom plate 2a. Yes. In addition, the heat radiating pipe portion 31b is disposed close to the heat transfer fluid storage pipe 16.

  For example, an inexpensive vinyl chloride resin pipe is used as the heat transfer fluid storage pipe 16, but it is not always necessary to use a vinyl chloride resin pipe.

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

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

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

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

  The upper limit of the depth of the pipe burying groove dug by such a backhoe is an example, and is not necessarily limited to the above-described numerical values. For example, when the construction condition of the pipe foundation + cover thickness changes according to the diameter of the heat transfer fluid storage pipe 16, the upper limit of the depth of the pipe burying groove changes according to the diameter, the pipe foundation, and the cover thickness.

<Lower limit of depth of pipe burial groove>
In addition, for example, when it is necessary to provide earth retaining for the building 3, the lower limit of the excavation depth dug by the backhoe is 1.5 m, for example.

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

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

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

  Further, as shown in FIG. 2, the heat transfer fluid storage pipe 16 includes a large-diameter pipe body 17 and cap-shaped lid bodies 18 and 19 that respectively close both ends of the pipe body 17. Small-diameter connecting pipe portions 18a and 19a are integrally formed at the central portions of the lids 18 and 19 so as to protrude outward.

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

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

  Further, as shown in FIG. 2, the blower fan 8b, the compressor 14, and the circulation pump 22 of the underfloor radiator 8 are controlled by a control circuit 23 as a control means (control unit). The operation of the control circuit 23 is controlled by a controller 34.

[Action]
Next, the operation of the building air conditioning system using the geothermal heat and heat pump having such a configuration will be described.

  A temperature detection signal from the temperature sensor 35 is always input to the controller 34 a of the controller 34. The controller 34a opens the on-off valve 32 when the switch 34b is turned on, and turns on (closes) the on-off valve 32 when the switch 34b is turned off. When the remaining hot water in the bathtub 30 is drained with the on-off valve 32 opened, the remaining hot water is drained into the sewage tank 33 through the drain pipe 31 and the on-off valve 32.

Along with this, the drainage sensor 36 detects the drainage state of the remaining hot water, outputs a drainage detection signal, and inputs this drainage detection signal to the control unit 34a. In the drainage detection signal, when all remaining hot water is drained into the sewage basin 33, the drainage sensor 36 does not detect the drainage flow of the remaining hot water. When the drainage detection signal disappears, the control unit 34a turns off (closes) the on-off valve 32.
If the ON / OFF time of the on-off valve 32 is set by a timer (not shown), the control unit 34a can turn on / off the on-off valve 32 at the set time.

  As the remaining hot water flows through the heat radiating pipe portion 31b of the drain pipe 31, the heat of the remaining hot water is radiated from the heat radiating pipe portion 31b to the ground and stored in the ground. Become.

  In winter and the like, the control unit 34 a can control the opening / closing valve 32 to open and close based on the wastewater detection signal from the drainage sensor 36 and the temperature detection signal from the temperature sensor 35.

  For example, in a state where the drainage detection signal from the drainage sensor 36 is detected, the temperature of the heat radiating pipe portion 31b detected from the temperature detection signal from the temperature sensor 35 is equal to or higher than a predetermined temperature (for example, lower than the underground temperature). In the high state), the on-off valve 32 is temporarily turned off (closed), and the heat of the remaining hot water in the heat radiating pipe portion 31b is radiated to the ground.

Along with this heat radiation, when the temperature of the heat radiating pipe portion 31b detected from the temperature detection signal from the temperature sensor 35 decreases, the temperature drop rate per unit time becomes lower than a predetermined value, and the temperature drop rate becomes loose. .
In this case, since the heat radiation amount decreases, the control unit 34a turns on (opens) the on-off valve 32. As a result, the remaining hot water from the bathtub 30 is further drained, and the remaining hot water that has initially been accumulated in the heat radiating pipe portion 31b and has dropped in temperature is pushed out into the sewage tank 33 by the high-temperature remaining hot water from the bathtub 30 It is.

  Along with this, when the temperature of the heat radiating pipe portion 31b detected from the temperature detection signal from the temperature sensor 35 becomes close to the temperature of the first remaining hot water, the control portion 34a turns off the on-off valve 32 (closes). The heat of the remaining hot water is released into the ground. Such ON / OFF control of the on-off valve 32 is repeatedly executed by the control unit 34a until there is no remaining hot water in the bathtub 30.

  When the heat of such remaining hot water is dissipated into the ground and the temperature in the ground rises, this heat raises the temperature of the antifreeze liquid in the heat transfer fluid storage pipe 16.

  On the other hand, when the floor 3a and the building 3 are heated in winter, the control circuit 23 drives and controls the blower fan 8b, the compressor 14, and the circulation pump 22. Along with this, the circulation pump 22 circulates the antifreeze liquid between the heat transfer fluid storage pipe 16 and the heat exchange container 11 b of the first heat exchange unit 11 via the circulation pipes 20 and 21.

  The compressor 14 compresses the refrigerant from the evaporator 11a and circulates the condenser 8a, the expansion valve 15, and the evaporator 11a in this order.

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

  At this time, when the underground temperature is heated by the remaining hot water drainage from the bathtub 30 and the temperature is rising, the antifreeze liquid in the heat transfer fluid storage pipe 16 is also heated by the heat of the remaining hot water and the temperature is increased. doing. As a result, when the antifreeze liquid in the heat transfer fluid storage pipe 16 is heated by using the heat of the remaining hot water in the bathtub 30, the antifreeze liquid in the heat transfer fluid storage pipe 16 is heated. Can be raised as compared with the case of heating only by underground heat.

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

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

  As described above, the heat pump system, that is, the hot water supply exhaust heat utilization air conditioning system is an underfloor air conditioning system, in which a heat source of the heat pump unit 7 is circulated in an underground pipe (heat transfer fluid storage pipe 16) embedded in the ground. This antifreeze is circulated between the underground pipe (heat transfer fluid storage pipe 16) and the first heat exchange part 11 of the heat pump unit 7 using the antifreeze as the liquid. Moreover, the underground pipe (heat transfer fluid storage pipe 16) is buried under the foundation (solid foundation 2) of the house that has been thermally insulated.

  In addition, an inexpensive PVC pipe is used as a general member for the underground pipe (heat transfer fluid storage pipe 16). This underground pipe (heat carrier fluid storage pipe 16) does not stick to the material and shape as long as the circulating liquid (antifreeze) can be held without leaking. However, if the material and shape of the underground pipe (heat transfer fluid storage pipe 16) is a pipe made of vinyl chloride, the length of the buried pipe can be adjusted according to the capacity of the heat pump unit 7 to construct a building (house ) Can cope with 3 heating / cooling loads.

  In this way, a buried underground pipe (heat transfer fluid storage pipe 16) is horizontally buried directly below the foundation (solid foundation 2) in the vicinity of the foundation (solid foundation 2) of the building (house) 3. By using a heat pump system in which the buried pipe (heat transfer fluid storage pipe 16) is the primary heat source, in addition to being able to use the underground heat, it is also possible to use the heat that escapes under the housing foundation (solid foundation 2). Thereby, it is possible to stably operate with high efficiency irrespective of the outside air condition that affects the capacity and efficiency of the heat pump unit 7. Moreover, it becomes a primary side heat source cheaper than the underground pile of a general underground heat pump system.

(Example 2)
In Example 1, in order to drain the remaining hot water of the bathtub 30 by its own weight, the heat radiating pipe portion 31b of the drain pipe 31 is inclined, while the heat transfer fluid storage pipe 16 is horizontally disposed. It is not limited.

  For example, as in the second embodiment shown in FIG. 3, the heat carrying fluid storage pipe 16 is inclined along the heat radiating pipe portion 31b, and the inclined heat carrying fluid storage pipe 16 and the heat radiating pipe portion 31b are brought into contact with each other. It is good also as a composition. In this configuration, since the heat of the remaining hot water can be directly transmitted to the heat transfer fluid storage pipe 16 to the heat radiating pipe portion 31b, the heat exchange efficiency between the heat dissipation pipe portion 31b and the heat transfer fluid storage pipe 16 is improved.

Example 3
Further, in the third embodiment, as shown in FIG. 4, the antifreeze liquid in the heat transfer fluid storage pipe 16 can be directly heated by the heat from the heat radiating pipe portion 31b. For this reason, in FIG. 4, the heat radiating pipe portion 31 b is inclined through the lids 18 and 19, which are end walls at both ends of the heat transfer fluid storage pipe 16, and is inclined in the heat transfer fluid storage pipe 16. ing. Thereby, in Example 4, the heat | fever of the remaining hot water of the heat radiating pipe part 31b is radiated from the whole outer peripheral surface of the heat radiating pipe part 31b in the heat transport fluid storage pipe 16, and the antifreeze liquid in the heat transport fluid storage pipe 16 is heated. Is done. According to the third embodiment, the heat exchange efficiency between the heat radiating pipe portion 31b and the heat transfer fluid storage pipe 16 is improved as compared with the second embodiment.

Example 4
In the fourth embodiment, as shown in FIG. 5, the heat transfer fluid storage pipe 16 is provided in parallel with the inflow pipe portion 16a provided in the horizontal direction and in parallel with the inflow pipe portion 16a in the horizontal direction. The return pipe portion 16b and a connecting portion connecting the inflow pipe portion 16a and the return pipe portion 16b are bent into a U shape (or a U shape).

  Further, the heat radiating pipe portion 31b of the drain pipe 31 is disposed in an inclined state so as to pass between the inflow pipe portion 16a and the return pipe portion 16b. Moreover, the heat radiating pipe portion 31b has a small inclination and is provided so as to substantially follow the inflow pipe portion 16a and the return pipe portion 16b.

  In the fourth embodiment, the heat of the remaining hot water radiated radially from the heat radiating pipe portion 31b heats the antifreeze liquid in the heat transfer fluid storage pipe 16 at two locations of the inflow pipe portion 16a and the return pipe portion 16b. Thereby, the heat exchange efficiency can be improved as compared with the first embodiment in which the heat of the remaining hot water radiated radially from the heat radiating pipe portion 31b heats the antifreeze liquid in the heat transfer fluid storage pipe 16 at one place.

  The hot water use section is not limited to the bathtub 30 but may be a sink of a kitchen that uses hot water supplied from a hot water supply device (not shown), a bowl in a washroom, or the like.

(Other)
In FIG. 4, the interval between the inflow pipe portion 16a and the return pipe portion 16b is wide, but the interval between the inflow pipe portion 16a and the return pipe portion 16b is narrowed so that heat from the heat radiating pipe portion 31b is transferred to the inflow pipe. By bringing the portion 16a and the return pipe portion 16b closer, the amount of heat transfer from the heat radiating pipe portion 31b to the heat transfer fluid storage pipe 16 may be increased.

  Further, in FIG. 4, the heat radiating pipe portion 31b of the drain pipe 31 is inclined so as to substantially follow the inflow pipe portion 16a and the return pipe portion 16b, but in parallel with the inflow pipe portion 16a and the return pipe portion 16b. It may be arranged. In this case, the inflow pipe portion 16a and the return pipe portion 16b may be set to the same inclination as the heat radiating pipe portion 31b.

<Operations and effects of the embodiment>
(1). The hot water supply exhaust heat utilization air conditioning system according to the embodiment of the present invention uses the exhaust heat of hot water drained outside the building from the hot water utilization section in the building. The air conditioner heat pump system 6 uses the underground heat exchanging means (heat transfer fluid storage pipe 16) buried in the ground and the heat of the refrigerant heat exchanged by the first heat exchanging part 11 to the second A heat exchange unit (condenser 8a) has a heat pump used for air conditioning in the building. In addition, the air conditioner heat pump system 6 is configured so that the heat transfer fluid can be circulated between the first heat exchange unit 11 and the underground heat exchange means (heat transfer fluid storage pipe 16). Circulation pipes (20, 21) connected to the exchange unit 11 and the underground heat exchange means (heat transfer fluid storage pipe 16), and the heat transfer fluid through the circulation pipe (20, 21) to the first 1 is provided with a circulation pump 22 that circulates between the heat exchange section 11 and the underground heat exchange means (heat transfer fluid storage pipe 16). Moreover, a drain pipe 31 connected to the hot water utilization section (tub 30) is buried in the ground in the vicinity of the underground heat exchange means (heat transfer fluid storage pipe 16), and the drain pipe 31 is filled with the drain pipe 31. The heat transfer fluid of the underground heat exchange means (heat transfer fluid storage pipe 16) is provided so as to be heatable by the exhaust heat of the drained hot water.
According to this configuration, with a small number of parts, the heat of hot water drained outside the building from the hot water use section (tub 30) in the building is effectively recovered together with the underground heat, and the recovered heat is used for heating. Can do.

  In addition, the hot water drained from this hot water utilization part is drained to the sewer through the sewage basin 33 outside the building in the embodiment. However, the hot water drained from the hot water utilization section may be drained to a place other than the sewerage outside the building, for example, to the septic tank, or depending on the place, it can be drained directly to a drainage channel outside the building. .

(2). Moreover, in the hot water supply exhaust heat utilization air conditioning system of the embodiment of the present invention, the drain pipe 31 has a heat radiating pipe portion 31b inclined downward from the hot water utilization portion (tub 30) side toward the outside of the building. The on-off valve 32 is interposed at the lower end of the heat radiating pipe portion 31b.

  According to this configuration, when the remaining hot water is drained to the sewage basin 33 through the drain pipe 31, the on-off valve 32 is controlled to open and close, thereby radiating heat from the heat radiating pipe portion 31 b of the drain pipe 31 to the ground and underground. Since the amount of heat transferred to the heat exchanging means (heat transfer fluid storage pipe 16) can be increased, more heat of the remaining hot water can be transferred to the heat transfer fluid storage pipe 16.

(3). Further, in the hot water supply exhaust heat utilization air conditioning system according to the embodiment of the present invention, it is located directly below the solid foundation 2 of the building and is buried in a shallow position from the ground surface 1a toward the direction along the solid foundation 2, The heat transfer fluid storage pipe 16 is disposed so as to be in contact with the heat radiating pipe portion 31 b of the drain pipe 31.

  According to this configuration, since the heat of the remaining hot water can be directly transmitted to the heat transfer fluid storage pipe 16 to the heat radiating pipe portion 31b, the heat exchange efficiency between the heat dissipation pipe portion 31b and the heat transfer fluid storage pipe 16 is improved.

(4). Further, in the hot water supply exhaust heat utilization air conditioning system according to the embodiment of the present invention, the underground heat exchange means (heat transfer fluid storage pipe 16) is located directly below the solid foundation 2 of the building and is shallow from the ground surface 1a. The heat transfer fluid storage pipe 16 is buried in a direction along the solid foundation 2 at a position, and a heat radiating pipe portion 31 b of the drain pipe 31 is disposed in the heat transfer fluid storage pipe 16.

  According to this configuration, the heat exchange efficiency between the heat radiating pipe portion 31b and the heat transfer fluid storage pipe 16 is improved.

(5). Further, in the hot water supply exhaust heat utilization air conditioning system according to the embodiment of the present invention, the underground heat exchange means (heat transfer fluid storage pipe 16) is located directly below the solid foundation 2 of the building and is shallow from the ground surface 1a. Heat transfer bent into a shape including an inflow pipe portion 16a embedded in a direction along the solid foundation 2 at a position and a return pipe portion 16b provided in parallel to the inflow pipe portion 16a with a space therebetween In addition to the fluid storage pipe 16, the heat radiating pipe portion 31b of the drain pipe 31 is disposed between the inflow pipe portion 16a and the return pipe portion 16b.

  According to this configuration, the heat of the remaining hot water radiated radially from the heat radiating pipe portion 31b heats the antifreeze liquid in the heat transfer fluid storage pipe 16 at two locations of the inflow pipe portion 16a and the return pipe portion 16b. The heat exchange efficiency can be improved as compared with the case where the heat of the remaining hot water radiated radially from the heat radiating pipe portion 31b heats the antifreeze liquid in the heat transfer fluid storage pipe 16 at one place.

1 ground 1a ground surface 1b underground 2 solid foundation (foundation)
3 Building 6 Heat pump system (air conditioner)
7 Heat pump unit 8 Underfloor radiator 8a ... Condenser (second heat exchange part)
DESCRIPTION OF SYMBOLS 11 1st heat exchange part 16 Heat transfer fluid storage pipe 16a Inflow pipe part 16b Return pipe part 20 Circulation pipe 21 Circulation pipe 22 Circulation pump 30 Bathtub (hot water utilization part)
31 Drainage pipe 31b Heat radiation pipe part 32 On-off valve 33 Sewage tank

Claims (5)

In the hot water supply exhaust heat utilization air conditioning system using the exhaust heat of the hot water drained outside the building from the hot water utilization section in the building,
The air conditioner
Underground heat exchange means buried in the ground,
A heat pump that uses the heat of the refrigerant that is heat-exchanged in the first heat exchange unit for air conditioning in the building in the second heat exchange unit;
A circulation pipe connected to the first heat exchanging unit and the underground heat exchanging means so that a heat transfer fluid can be circulated between the first heat exchanging unit and the underground heat exchanging unit;
A circulation pump for circulating the heat transfer fluid between the first heat exchange unit and the underground heat exchange means via the circulation pipe;
The drainage pipe connected to the hot water utilization part is embedded in the ground in the vicinity of the underground heat exchange means, and the heat of the underground heat exchange means by the exhaust heat of the hot water drained in the drainage pipe. An air-conditioning system using hot water and exhaust heat, which is provided so as to heat the carrier fluid.   2. The hot water supply exhaust heat utilization air conditioning system according to claim 1, wherein the drain pipe has a heat radiating pipe portion inclined downward from the hot water utilization portion side toward the outside of the building, and is opened and closed at a lower end of the heat radiating pipe portion. A hot water supply exhaust heat utilization air conditioning system, characterized in that a valve is interposed.   The hot water supply exhaust heat utilization air conditioning system according to claim 1 or 2, wherein the underground heat exchanging means is located directly below the solid foundation of the building and is directed from the ground surface to a shallow position in a direction along the solid foundation. A hot water supply exhaust heat utilization air conditioning system, characterized in that it is a heat transfer fluid storage pipe that is buried and is disposed so as to be in contact with a heat radiating pipe portion of the drain pipe.   The hot water supply exhaust heat utilization air conditioning system according to claim 1 or 2, wherein the underground heat exchanging means is located directly below the solid foundation of the building and is directed from the ground surface to a shallow position in a direction along the solid foundation. A hot water supply exhaust heat utilization air conditioning system, characterized in that the heat transfer fluid storage pipe is buried, and a heat radiating pipe portion of the drain pipe is disposed in the heat transfer fluid storage pipe. The hot water supply exhaust heat utilization air conditioning system according to claim 1 or 2, wherein the underground heat exchanging means is located directly below the solid foundation of the building and is directed from the ground surface to a shallow position in a direction along the solid foundation. A heat transfer fluid storage pipe bent into a shape including a buried inflow pipe portion and a return pipe portion provided in parallel to the inflow pipe portion at an interval;
The hot water supply exhaust heat utilization air conditioning system, wherein the heat radiating pipe portion of the drain pipe is disposed between the inflow pipe portion and the return pipe portion.

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