JP2012097459A - Ventilation system of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency of an indoor cooling by utilizing geothermal heat.SOLUTION: A building 12 is provided with a down pipe 16 as a rainwater drainage system which recovers rainwater flowing along the building 12, and an underground rainwater pipeline 17 which discharges the rainwater flowing through the rainwater drainage system to a sewage system is provided in the ground around the building. The underground rainwater pipeline 17 is used as an underground heat exchange pipe and heat exchange is performed between a space inside the pipe and the ground. The underground rainwater pipeline 17 is connected with a communication pipeline 25 which discharges air after the heat exchange is performed in the underground rainwater pipeline 17 to a habitable room 13. The underground rainwater pipeline 17 is also connected with a cool air intake pipe 31 which is provided in the state of being at least partially embedded in the ground around the building and which takes in cool air generated by evaporation of water in or near the ground surface around the building.

Description

  The present invention relates to a building ventilation system.

  Conventionally, it has been proposed to air-condition a building using geothermal heat whose temperature is stable throughout the year (see, for example, Patent Document 1). Specifically, a heat exchanging tube is buried in the ground below the soil concrete of the building, and one end of the tube communicates with the indoor space. Then, for example, air in a tube cooled by heat exchange with geothermal heat in the summer is blown into the indoor space, thereby cooling the indoor space.

JP 2003-35456 A

  However, in recent years, demands for environmental conservation are increasing, and new technologies for realizing energy saving are desired in building-related technologies. Here, if the efficiency of indoor cooling by using geothermal heat can be realized, it is considered that it is possible to reduce the operation amount of the air conditioner using electric energy etc., and from that viewpoint, in the system of geothermal heat use There is room for technological improvement.

  An object of the present invention is to provide a ventilation system for a building that can improve the efficiency of indoor cooling by using geothermal heat.

  Hereinafter, means and the like effective for solving the above-described problems will be described while showing functions and effects as necessary.

  1st invention is embed | buried in the ground of a building, and is connected to the underground heat exchange pipe | tube which is heat-exchanged between the space inside a pipe | tube, and the said ground, and this underground heat exchange pipe | tube An air exhaust pipe that exhausts the air after the heat exchange has been performed in the pipe to the indoor space, and a ground that is at least partially buried in the ground around the building, and the ground around the building or near the ground A cold air intake pipe for taking in cold air generated by vaporization of water in the water, and the cold air intake pipe is connected to the underground heat exchange pipe.

  In a high temperature environment such as summer, air in the underground heat exchange pipe is cooled by heat exchange with the ground, and the generated cold air is discharged into the indoor space through the air discharge pipe. Thereby, the indoor space can be cooled. In particular, the underground heat exchange pipe receives cold air generated by water vaporization through the cold air intake pipe. In this case, in the underground heat exchange pipe, since further geothermal cooling is performed on air containing cold air, further cooling of the air blown into the indoor space is possible. As a result, it is possible to increase the efficiency of indoor cooling using geothermal heat.

  In the second invention, the building is provided with a rainwater drainage system that collects rainwater flowing through the building, and the ground around the building discharges rainwater flowing through the rainwater drainage system to the sewage system. A rainwater conduit is provided, and the underground rainwater conduit is used as the underground heat exchange tube.

  In general, rainwater drainage systems consisting of eaves and ridges are provided at multiple locations in a building, and underground rainwater pipes that collect rainwater from the rainwater drainage system are extended along the building, for example, surrounding the building. The Under such a premise, by using the underground rainwater pipe as the underground heat exchange pipe, the heat exchange section in which heat exchange with the geothermal heat is performed is naturally a long pipe section. Therefore, heat exchange when air passes through the underground heat exchange pipe (underground rainwater pipe line) can be greatly promoted, and geothermal utilization can be efficiently performed.

  In addition, by using the underground rainwater pipe as an underground heat exchange pipe, an effect in terms of facilities can be obtained. That is, when the heat exchange section is lengthened to promote underground heat exchange, if the underground pipe (so-called earth tube) is lengthened, there is a concern that the equipment cost increases accordingly. In this regard, by using the underground rainwater pipe as a underground heat exchange pipe, a new pipe extension is not required, and a preferable configuration can be realized from the viewpoint of facility installation.

  In a third aspect of the invention, the rainwater drainage system has a vertical shaft extending in the vertical direction along the outer wall of the building and connected to the underground rainwater pipeline at the lower end portion. A vertical opening / closing means is provided that opens when the rainwater is distributed and closes when the rainwater is not distributed.

  In the state where the vertical ridge leading to the underground rainwater pipeline is open to the atmosphere, even if cold air is generated in the underground rainwater pipeline, it may not be supplied to the indoor space side and may be released to the outside through the vertical rainwater. is there. In this respect, the above-mentioned inconvenience can be suppressed while the function as the rainwater drainage system is maintained by providing the vertical shaft opening / closing means on the vertical shaft. That is, when rainwater flows in rainy weather, the vertical shaft opening / closing means is opened, and rainwater flowing through the rainwater drainage system can be discharged to the sewerage system through the underground rainwater pipeline. Further, when the rainwater is not distributed, the vertical opening / closing means is closed, so that it is possible to suppress the cold air generated in the underground rainwater pipeline from being released to the outdoors through the vertical rainwater.

  In a fourth aspect of the invention, the building is provided with an exhaust passage portion that generates an air flow due to a temperature rise accompanying irradiation of sunlight and exhausts the air to the outdoors. The exhaust passage is communicated with the indoor space, and when the cold air is taken into the indoor space, the indoor space is exhausted through the exhaust passage.

  According to the above configuration, when the weather is fine, an air flow is generated in the exhaust passage due to a temperature rise associated with the irradiation of sunlight, and the air is exhausted outdoors in the indoor space. By exhausting from the indoor space to the outside in this way, introduction of cold air from the underground heat exchange pipe to the indoor space is promoted. Also, the intake of cold air through the cold air intake tube is promoted as well. Therefore, the cooling efficiency of the indoor space is increased.

  In the fifth aspect of the invention, the indoor space communicates with a vertical shaft constituting the rainwater drainage system of the building, and the vertical beam is used as the exhaust passage portion.

  The space in the vertical wall is a vertically long space extending vertically, and an upward air flow is generated in the vertical wall due to a temperature rise accompanying the irradiation of sunlight. Using this, exhausting to the outside in an indoor space is carried out. Thereby, introduction of cold air from the underground heat exchange pipe to the indoor space is promoted.

  In the sixth invention, the intake pipe opening and closing means for opening and closing the cold air intake pipe, the temperature detection means for detecting the temperature of the indoor space, and the intake pipe opening and closing based on the temperature detected by the temperature detection means Control means for controlling opening and closing of the means.

  According to the above configuration, the opening / closing of the intake pipe opening / closing means is controlled when the temperature of the indoor space becomes equal to or higher than a predetermined value during the daytime in summer, for example. Thereby, cold air can be taken in according to the indoor environment.

The block diagram which shows a building and a drainage system. The drainage system figure which shows arrangement | positioning of the drainage system around a building. The figure which shows the flow of the air at the time of ventilation implementation. The block diagram about another embodiment. The block diagram which shows the building ventilation control system.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a building ventilation system according to the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing a building and a drainage system, and FIG. 2 is a drainage system diagram showing an arrangement of drainage systems around the building. FIG. 2 is a diagram showing a drainage system around the building in plan view.

  In FIG. 1, a foundation 11 is provided on the ground, and a building 12 is installed on the foundation 11. The ground is the surface layer of the core that supports the building. In FIG. 1, for convenience of explanation, a one-story building is shown as the building 12, and a living room 13 is shown as a space in the building. The building 12 is provided with a roof portion 14. The roof portion 14 is made of, for example, a gable roof, and an eaves 15 is provided on each inclined surface of the roof portion 14. Each eaves 15 is connected to a vertical stand (rainwater standpipe) 16 extending in the vertical direction along the outer wall of the building 12. The lower end of the vertical rod 16 is embedded in the ground around the building and connected to the underground rainwater conduit 17. The underground rainwater pipe 17 is made of, for example, a concrete pipe.

  As shown in FIG. 2, standing rods 16 are provided at a plurality of locations around the building 12, and underground rainwater pipes 17 are provided so as to surround the plurality of standing rods 16. In the configuration shown in the figure, underground rainwater pipes 17 are extended in a substantially U shape along three side surfaces of the four side surfaces of the building 12. In the underground rainwater pipeline 17, a rainwater mass 17 a is provided at a connection portion with the vertical rod 16. The underground rainwater pipeline 17 constitutes a rainwater collecting route for collecting and collecting rainwater flowing down through each vertical shaft 16, and the underground rainwater pipeline 17 around the building is illustrated via the sewage system 18. Not connected to public sewers. Therefore, the rainwater flowing down through the roof portion 14 flows into the underground rainwater pipeline 17 below the ground through the eaves 15 and the standing rod 16 and is discharged to the sewage system 18 through the underground rainwater pipeline 17. The sewage system 18 is provided with a sewage system opening / closing means 19 (for example, an opening / closing plate) that opens and closes the pipeline of the sewage system 18. By closing the sewage system opening / closing means 19, the underground rainwater pipe 17 and the sewage system are connected. The air flow between the two is interrupted. A rainwater drainage system is constituted by the eaves fence 15 and the standing fence 16.

  Further, in the building 12, a shed ventilation passage 22 is provided in the shed space 21 between the living room 13 and the roof 14. The attic ventilation passage 22 is a ventilation passage for exhausting the air in the living room 13 through the skylight 23 provided in the roof portion 14, and the temperature of the attic space portion 21 is increased as the roof portion 14 is irradiated with sunlight. When it rises, an updraft is generated in the attic ventilation passage 22. And the air in the living room 13 is discharged | emitted outside through the skylight 23 by the updraft. In addition, the skylight 23 is provided with a window door that opens and closes manually or electrically. The cabin back ventilation passage 22 corresponds to an exhaust passage portion.

  In the building 12 of this embodiment, the structure which takes in cold air and warm air in the living room 13 using geothermal heat is employ | adopted, and in order to improve the heat exchange efficiency especially with geothermal, the underground rainwater pipe line 17 is exchanged with underground heat. The structure is used as a tube. That is, the underground rainwater pipe 17 is used as a so-called earth tube. The details will be described below.

  As shown in FIGS. 1 and 2, a communication pipe 25 that connects the underground rainwater conduit 17 and the living room 13 is embedded in the ground. The communication pipe 25 is provided across the ground portion that is below the building 12 and the ground portion that is around the building 12 by being inserted into the foundation through-hole 11 a formed at the rising portion of the foundation 11. The communication pipe 25 has a horizontal pipe part 25a provided across the inside and outside of the foundation 11, and a vertical pipe part 25b extending in the vertical direction via the underfloor space. One end of the horizontal pipe portion 25 a is connected to the underground rainwater pipe 17 on the outside of the foundation 11. The communication pipe 25 corresponds to an air discharge pipe. It is also possible to use the horizontal pipe part 25a of the communication pipe 25 as an underground heat exchange pipe together with the underground rainwater pipe 17 and the vertical pipe part 25b as an air discharge pipe.

  In the underground rainwater pipeline 17, each vertical rod 16 is connected at a first connection point J1, and a communication pipe 25 is connected at a second connection point J2. In the present embodiment, the rainwater mass 17a is the first connection point J1. Moreover, the 2nd connection point J2 is provided in the underground rainwater pipe line 17 extended along one building side surface among the two side surfaces which oppose in the building 12. FIG.

  At the upper end of the vertical pipe portion 25b of the communication pipe 25, that is, at the room-side air discharge port of the communication pipe 25 provided on the floor of the room, the room 13 and the communication pipe 25 are either in communication or blocked. A lid plate 26 is provided as a discharge port opening / closing means.

  A drain trap 27 for opening and closing an internal rainwater passage which is an internal passage of the standing rod 16 is provided on each of the above-mentioned plurality of standing rods 16 on the ground. The drain trap 27 constitutes a vertical opening / closing means that opens when rainwater flows in rainy weather and closes when rainwater does not flow. More specifically, the drain trap 27 is an open / close valve that is opened by its weight when a predetermined amount of rainwater is accumulated in the vertical rod 16, for example, in a state where rainwater does not accumulate more than a predetermined amount, Under the circumstances, the closed state is maintained, and the communication between the vertical rod 16 (the vertical vertical portion above the drain trap 27) and the underground rainwater conduit 17 is blocked. In addition, the drain trap 27 is provided with an open maintenance mechanism that can maintain an open state regardless of the presence or absence of rainwater in the vertical rod 16, for example, according to the amount of rainwater in the vertical rod 16 by a user's manual operation. The open / closed state and the open-maintained state can be switched. The drain trap 27 may be provided not in the ground portion of the vertical rod 16 but in the underground portion.

  The ground around the building is provided with a cold air intake pipe 31 for taking in cold air generated by vaporization of water around or near the ground around the building. As shown in FIG. 2, the cold air intake pipes 31 are provided at a plurality of locations (two locations in the figure) around the building, and each cold air intake pipe 31 provides an outdoor space (a space portion near the ground around the building). And the underground rainwater pipeline 17 are communicated with each other. The inlet opening / closing means for connecting the outdoor space and the cold air intake pipe 31 to either the open or closed state at the upper end opening of the cold air intake pipe 31, that is, the outdoor intake port of the cold air intake pipe 31. A cover plate 32 is provided.

  Moreover, the outdoor vaporization generation | occurrence | production part 33 is provided in the ground surface around a building. The outdoor vaporization generation part 33 consists of dog running comprised by laying stone, brick, concrete, gravel etc. on the ground, for example, The upper end opening part of the cold air intake pipe 31 is set in the outdoor vaporization generation part 33 (Outdoor side inlet) is provided. A watering device 35 is provided in the vicinity of the outdoor vaporization generating unit 33. When water is sprayed from the sprinkler 35 to the outdoor vaporization generating unit 33 in fine weather, the outdoor vaporization generating unit 33 vaporizes water by irradiation of sunlight, and the cold air generated by the vaporization of the water is taken out by the cold air. It is taken into the take-in tube 31. In addition, the structure which accumulates rainwater in the outdoor vaporization generation | occurrence | production part 33, and vaporizes the rainwater may be sufficient.

  The operation of the ventilation system configured as described above will be described with reference to FIG. FIGS. 3A and 3B are diagrams showing the air flow during ventilation, where FIG. 3A shows the air flow when cooling the living room 13 and FIG. 3B shows the air flow when warming the living room 13. . In FIG. 3, for convenience of explanation, only the configuration of the passage portion that is actually opened in the configuration of the drainage system shown in FIG. 2 is shown, and the illustration of the configuration of the passage portion that is not opened is omitted. In both (a) and (b), the sewage system opening / closing means 19 is closed, and the flow of air between the underground rainwater pipeline 17 and the sewage system 18 is blocked.

  The flow of air in a high temperature environment such as summer is as shown in FIG. In this case, the cover plates 26 and 32 of the communication pipe 25 and the cold air intake pipe 31 are opened, and ventilation through the pipes 25 and 31 is possible. In addition, all the drain traps 27 provided on each vertical rod 16 are in a closed state (illustration of the vertical rod 16 is omitted). In the state of FIG. 3A, the air in the underground space of the underground rainwater pipe 17 is cooled by heat exchange with the ground, and the generated cold air is discharged to the living room 13 through the communication pipe 25. Thereby, the living room 13 is cooled. Here, at the time of fine weather, ascending airflow is generated in the shed ventilation passage 22 by the irradiation of sunlight to the roof portion 14, and in the state where the skylight 23 is opened, the air in the living room 13 is discharged outside through the skylight 23. Thereby, introduction of cold air from the underground rainwater pipeline 17 to the living room 13 is promoted.

  In particular, cold air generated by the evaporation of water outdoors is taken into the underground rainwater pipe 17 through the cold air intake pipe 31. In such a case, in the underground rainwater pipe 17, since geothermal cooling is further performed on air containing cold air, further cooling of the air blown into the living room 13 is possible.

  On the other hand, the flow of air in a low temperature environment such as in winter is as shown in FIG. In this case, the cover plate 26 of the communication pipe 25 is in an open state and can be ventilated, and the cover plate 32 of the cold air intake pipe 31 is in a closed state and cannot be vented. Of the drain traps 27 provided on each vertical rod 16, the drain trap 27 of the vertical rod 16 close to the connection point J2 between the underground rainwater pipe 17 and the communication pipe 25 is in a closed state (ie, not shown) and connected. The drain trap 27 of the stand 16 far from the point J2 is in an open state (that is, illustrated). That is, three standing beams 16 are provided around the building 12 on the two opposite side surfaces (see FIG. 2), one of which (upper side in the drawing) is a standing beam 16 far from the connection point J2. The other side (the lower side of the figure) is a vertical shaft 16 close to the connection point J2. And the drain trap 27 is open | released only about the three stand 16 far from the connection point J2.

  In the state shown in FIG. 3B, in winter, the air in the underground rainwater pipe 17 is heated by heat exchange with the ground, and the generated warm air is discharged to the living room 13 through the communication pipe 25. . Thereby, the living room 13 is warmed. At this time, since the drain trap 27 is opened only for the vertical rod 16 far from the connection point J2 between the underground rainwater pipeline 17 and the communication pipe 25, air is sucked into the underground rainwater pipeline 17 from the vertical rod 16. In this case, it is possible to secure a section where the air is warmed by heat exchange in the underground rainwater pipe 17.

  According to the embodiment described in detail above, the following excellent effects can be obtained.

  A cold air intake pipe 31 is connected to the underground rainwater pipe 17 as a ground heat exchange pipe, and the cold air generated by the vaporization of water on the ground around the building or near the ground is passed through the cold air intake pipe 31. 17 to take in. Thereby, in the underground rainwater pipe line 17, further geothermal cooling is performed on air containing cold air, and thus further cooling of the air blown into the living room 13 is possible. As a result, it is possible to increase the efficiency of indoor cooling using geothermal heat.

  Since the underground rainwater pipeline 17 is used as the underground heat exchange pipe, the heat exchange section in which heat exchange with the geothermal heat is performed is naturally a long pipeline section. Therefore, heat exchange when air passes through the underground rainwater pipe 17 is greatly promoted, and geothermal utilization can be efficiently performed. In addition, when the heat exchange section is lengthened to promote underground heat exchange, if the underground pipe (so-called earth tube) is lengthened, there is a concern that the equipment cost increases accordingly. In this regard, by using the underground rainwater pipe 17 as an underground heat exchange pipe, a new pipe extension is unnecessary, and a preferable configuration can be realized from the viewpoint of facility installation.

  In the state where the standing ridge 16 leading to the underground rainwater conduit 17 is opened (open to the atmosphere), even if cold air is generated in the underground stormwater conduit 17, it is not supplied to the room 13 side, and is outdoors through the standing ridge 16. There is a possibility of being released. In this respect, the provision of the drain trap 27 as the vertical opening / closing means on the vertical rod 16 makes it possible to suppress the above-described disadvantage while maintaining the function as the rainwater drainage system. That is, the drain trap 27 is opened when rainwater flows in rainy weather, and rainwater flowing through the rainwater drainage system can be discharged to the sewage system 18 through the underground rainwater pipe 17. In addition, since the drain trap 27 is closed when rainwater is not distributed, it is possible to suppress the cool air generated in the underground rainwater conduit 17 from being released to the outside through the vertical wall 16.

  A hut ventilation passage 22 is provided in the building 12, and the warm air in the living room 13 is discharged outside through the hut ventilation passage 22. Thereby, introduction of cold air from the underground rainwater pipeline 17 to the living room 13 is promoted. Also, the intake of cold air through the cold air intake pipe 31 is promoted in the same manner. Therefore, the cooling efficiency of the indoor space is increased.

  When supplying warm air into the living room 13, among the plurality of vertical rods 16, the first connection point J1 (the connection point between the vertical rod 16 and the underground rainwater conduit 17) to the second connection point J2 (the underground rainwater tube). A pipe having a short pipe length up to the connection point between the pipe 17 and the communication pipe 25 is closed, and a pipe having a pipe length longer than the closed standing bar 16 is opened. As a result, when air is sucked into the underground rainwater conduit 17 from the vertical shaft 16, a section where the air is warmed by heat exchange in the underground rainwater conduit 17 can be sufficiently secured, and the efficiency of warm air can be increased. it can.

[Other Embodiments]
The present invention is not limited to the description of the above embodiment, and may be implemented as follows, for example.

  -It is good also as a structure which uses the vertical rod 16 as an exhaust passage part for discharging | emitting the air in the living room 13. As shown in FIG. Specifically, as shown in FIG. 4, a communication pipe 37 that communicates between the living room 13 and the upright 16 is provided, and when the cold air is taken into the living room 13, the living room 13 is exhausted through the upright 16. Good. In short, the space in the vertical rod 16 is a vertically long space extending vertically, and an upward air flow is generated inside the vertical beam due to a temperature rise accompanying the irradiation of sunlight. Utilizing this, the outside air is exhausted in the living room 13. Thereby, introduction of cold air from the underground rainwater pipeline 17 to the living room 13 is promoted. In addition, it is desirable to provide an open / close member (such as a shutter) in the communication pipe 37 and to prevent rainwater, outdoor dust, and the like from entering the living room 13 through the communication pipe 37 with the open / close member.

  -In the said embodiment, although it was set as the structure which changes the distribution route of air by the case where the inside of the room 13 is cooled and the case where it warms (refer FIG. 3 (a), (b)), it replaces with this and the inside of the room 13 is changed. It is good also as a structure which does not change the distribution route of air by the case where it cools and the case where it warms. Specifically, both the case where the inside of the living room 13 is cooled and the case where it is warmed are configured to circulate air through the distribution route shown in FIG. That is, it is considered that the configuration using the underground rainwater pipe 17 as the underground heat exchange pipe is useful not only when cooling the interior of the living room 13 but also when heating the interior of the living room 13. In the configuration in which the heat exchange section is extended by using the underground rainwater pipe 17 as the underground heat exchange pipe, the air introduced into the living room 13 can be efficiently cooled in the summer, and to the living room 13 in the winter. The introduced air can be warmed efficiently.

  In this case, if the inside of the living room 13 is cooled, there are two ways, and these may be switched as appropriate. For example, the configuration shown in FIGS. 3A and 3B is alternately switched at a predetermined time period. Alternatively, the state of water vaporization in the outdoor vaporization generating unit 33 is determined, and when the vaporization cooling is possible, the state shown in FIG. 3A is set. When the vaporization cooling is not possible, the state shown in FIG. As described above, the state switching control may be performed. The determination as to whether evaporative cooling is possible is, for example, determining whether the outdoor vaporization generating unit 33 is in a predetermined high temperature state where vaporization of water occurs, or there is water in the outdoor vaporization generating unit 33. It is good to determine whether or not.

  -In the building ventilation system of the said structure, it is good also as a structure which implements ventilation control to the living room 13 with an electronic controller. Specifically, the control system shown in FIG. 5 is adopted. The controller 40 is a known electronic control device having a CPU and various memories, and the detection signal of the room temperature sensor 41 and the detection signal of the room human sensor 42 are input to the controller 40. The room temperature sensor 41 is a temperature detection unit that detects the temperature (room temperature) in the room 13, and the room presence sensor 42 is a person detection unit that detects the presence or absence of a person in the room 13.

  In this control system, the drain trap 27, the cover plates 26 and 32, the watering device 35, and the fan device 43 are assumed as control targets, and the drain trap 27, the cover plates 26 and 32, and the watering device 35 are shown in FIG. Is shown in In such a case, in the drain trap 27, an open / close plate for opening / closing the vertical passage is opened / closed by driving the motor. The lid plates 26 and 32 are opened and closed by driving a motor. The lid plate 32 corresponds to intake pipe opening / closing means. The watering device 35 performs watering by driving a watering actuator. Moreover, the fan apparatus 43 is provided in the middle of the communication pipe 25, and the airflow which flows toward the living room 13 side from the underground rainwater pipe line 17 side generate | occur | produces by fan drive.

  In the summer, the controller 40 detects that there is a person in the room 13 by the room presence sensor 42 and if the temperature detected by the room temperature sensor 41 is equal to or higher than a predetermined temperature (for example, 30 ° C.), the controller 40 cools the room 13. Implement cold air intake control to capture air. This is, for example, control for taking cold air into the living room 13 in the manner shown in FIG. Specifically, all the drain traps 27 of each vertical rod 16 are closed. Further, the watering device 35 is sprinkled to cause the outdoor vaporization generating unit 33 to vaporize the water and open the cover plates 26 and 32. Further, the fan device 43 is driven.

  In addition, the controller 40 detects that there is a person in the room 13 by the room presence sensor 42 in the winter and if the temperature detected by the room temperature sensor 41 is equal to or lower than a predetermined temperature (for example, 10 ° C.), the controller 40 Execute warm air intake control for taking in warm air. This is, for example, control for taking warm air into the living room 13 in the manner shown in FIG. Specifically, among the drain traps 27 of each vertical rod 16, one with a short pipe length from the first connection point J1 to the second connection point J2 is closed, and one with a long pipe length is opened. Further, the lid plate 26 is opened and the fan device 43 is driven. Thereby, warm air is taken into the living room 13.

  According to said ventilation control, cold air and warm air can be taken in according to indoor environment.

  -It is good also as a structure which uses heat exchange piping (heat exchange chamber) only for geothermal recovery other than using the underground rainwater pipe 17 as a ground heat exchange pipe. In this case, the communication pipe 25 and the cold air intake pipe 31 are connected to the heat exchange pipe.

  The communication pipe 25 may be provided with a filter. Thereby, it is possible to prevent insects and small animals from entering the living room 13 through the communication pipe 25. In addition, a deodorizing member or a dehumidifying member may be provided in the communication pipe 25 in order to suppress odors and moisture from entering the living room 13 through the communication pipe 25.

  In the configuration of FIG. 1, the air heated by the roof portion 14 may be taken into the vertical rod 16 and further guided to the underground rainwater conduit 17 through the vertical rod 16. Specifically, a fan device is provided in the vertical rod 16, and air is taken into the vertical rod 16 and introduced into the underground rainwater pipe 17 by the airflow generated by driving the fan. For example, warm air generated in the roof portion 14 is taken into the living room 13 through the vertical wall 16, the underground rainwater pipe 17 and the communication pipe 25 in winter. Thereby, the inside of the living room 13 can be warmed efficiently.

  The building 12 shown in FIG. 1 is merely an example, and the present invention can be applied to buildings having other configurations. For example, the present invention can be applied to a building having a plurality of rooms on the same floor or a multi-storey building having two or more floors.

[Other inventions that can be extracted from this specification]
In the following, inventions that can be extracted in addition to the inventions described in the means column for solving the problems within the scope of disclosure of the present specification will be described while showing effects and the like as necessary.

(1) The building is provided with a rainwater drainage system that collects rainwater flowing through the building,
The ground around the building is provided with underground rainwater pipes that drain the rainwater flowing through the rainwater drainage system to the sewer system,
An underground heat exchange pipe buried in the ground of the building and allowing heat exchange between the space inside the pipe and the ground,
An air discharge pipe that is connected to the underground heat exchange pipe and discharges air into the indoor space after the heat exchange is performed in the underground heat exchange pipe;
With
The building ventilation system, wherein the underground rainwater pipe is used as the underground heat exchange pipe.

  In general, rainwater drainage systems consisting of eaves and ridges are provided at multiple locations in a building, and underground rainwater pipes that collect rainwater from the rainwater drainage system are extended along the building, for example, surrounding the building. The Under such a premise, by using the underground rainwater pipe as the underground heat exchange pipe, the heat exchange section in which heat exchange with the geothermal heat is performed is naturally a long pipe section. Therefore, heat exchange when air passes through the underground heat exchange pipe (underground rainwater pipe line) can be greatly promoted, and geothermal utilization can be efficiently performed.

  In addition, by using the underground rainwater pipe as an underground heat exchange pipe, an effect in terms of facilities can be obtained. That is, when the heat exchange section is lengthened to promote underground heat exchange, if the underground pipe (so-called earth tube) is lengthened, there is a concern that the equipment cost increases accordingly. In this regard, by using the underground rainwater pipe as a underground heat exchange pipe, a new pipe extension is not required, and a preferable configuration can be realized from the viewpoint of facility installation.

(2) The building is provided with a plurality of uprights as the rainwater drainage system, and the plurality of uprights are connected to the underground rainwater pipelines,
When performing ventilation using the underground rainwater conduit, the underground rainwater conduit and the air are connected to each other from a first connection point at which the standing rain and the underground rainwater conduit are connected. The building according to the above (1), in which a pipe having a short pipe length to the second connection point to which the discharge pipe is connected is closed, and a pipe having a long pipe length than the closed vertical shaft is opened. Ventilation system.

  According to the above-described configuration, the vertical stand far from the second connection point between the underground rainwater pipeline and the air discharge pipe, that is, the vertical stand having a long pipeline length to the second connection point is opened, and the rest is closed. As a result, when air is sucked into the underground rainwater pipeline from the standing wall, a section where the air is cooled or warmed by heat exchange in the underground rainwater pipeline can be sufficiently secured.

  12 ... Building, 13 ... Living room (indoor space), 14 ... Roof, 15 ... Eaves (rainwater drainage system), 16 ... Standing wall (rainwater drainage system), 17 ... Underground rainwater pipe (ground heat exchange pipe) , 18 ... sewage system, 22 ... shed ventilation passage (exhaust passage part), 27 ... drain trap (stand-up and closing means), 31 ... cold intake pipe, 32 ... cover plate (uptake opening and closing means), 40 ... Controller (control means), 41 ... room temperature sensor (temperature detection means).

Claims (6)

An underground heat exchange pipe buried in the ground of the building and performing heat exchange between the space inside the pipe and the ground,
An air discharge pipe that is connected to the underground heat exchange pipe and discharges air into the indoor space after the heat exchange is performed in the underground heat exchange pipe;
A cold air intake pipe that is provided in a state where at least a part is buried in the ground around the building, and takes in cold air generated by vaporization of water on or around the ground around the building;
With
The building ventilation system, wherein the cold air intake pipe is connected to the underground heat exchange pipe. The building is provided with a rainwater drainage system that collects rainwater flowing through the building,
The ground around the building is provided with underground rainwater pipes that drain the rainwater flowing through the rainwater drainage system to the sewer system,
The building ventilation system according to claim 1, wherein the underground rainwater pipe is used as the underground heat exchange pipe. The rainwater drainage system has a vertical shaft extending in the vertical direction along the outer wall of the building and connected to the underground rainwater pipeline at the lower end portion,
The building ventilation system according to claim 2, wherein the standing fence is provided with standing opening / closing means that opens when rainwater flows in rainy weather and closes when rainwater does not flow. The building is provided with an exhaust passage portion that generates an air flow due to a temperature rise associated with irradiation of sunlight and exhausts outdoors.
The exhaust passage is communicated with the indoor space,
The building ventilation system according to any one of claims 1 to 3, wherein when the cool air is taken into the indoor space, the indoor space is exhausted through the exhaust passage portion. The indoor space communicates with a vertical wall constituting the rainwater drainage system of the building,
The building ventilation system according to claim 4, wherein the vertical wall is used as the exhaust passage portion. Intake pipe opening and closing means for opening and closing the cold air intake pipe;
Temperature detecting means for detecting the temperature of the indoor space;
Control means for controlling opening and closing of the intake pipe opening and closing means based on the temperature detected by the temperature detecting means;
The ventilation system for buildings according to any one of claims 1 to 5.

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