JP2014142151A - Air conditioning system using geothermal heat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning system using geothermal heat capable of reducing heat loss in winter and heat inflow in summer, efficiently cooling/heating an entire building, and realizing energy saving.SOLUTION: An air conditioning system using geothermal heat comprises: heat exchange means 2 for exchanging heat with an underground soil, and cooling/heating air; cooled/heated air ventilation means 3 for cooling/heating an interior of a building by ventilating the air cooled/heated by this heating means; and air exhaustion means 4 for discharging the air ventilated by this cooled/heated air ventilation means to outdoor air from an attic space. As the cooling/heating ventilation means, the air conditioning system using geothermal heat comprises: an underfloor space 31 temporarily storing the air cooled/heated by the heat exchange means; inner-wall cooled/heated air passages 32 and 33 communicating with this underfloor space; an inner-ceiling cooled/heated air passage 34 communicating with these inner-wall cooled/heated air passages 32 and 33; and an attic space duct 35 communicating with this inner-ceiling cooled/heated air passage, and led to the outside air via the attic space. A portion of a ceiling where the inner-ceiling cooled/heated air passage is provided is formed into a double ceiling in which plate materials are installed to be vertically away from each other by a predetermined distance, and the inner-ceiling cooled/heated air passage is installed between the plate materials so as to be provided below a ceiling heat insulation material.

Description

  The present invention relates to a geothermal air-conditioning system, and more specifically, air that has been heated or cooled by exchanging heat with the underground ground by utilizing the fact that there is not much temperature change in the ground at a certain depth or more. It is related to the technology which air-conditions along a wall and a ceiling, and performs the air conditioning of the interior space of buildings, such as a living room.

  Conventionally, an air conditioning system using geothermal heat that heats and cools the building by exchanging heat with the underground underground deeply using the fact that the underground temperature does not change much at a certain depth is known. ing. For example, in Patent Document 1, heat exchange with the underground ground is performed to cool in the summer, and in the winter, warm air is taken under the floor, and the air is forced to exhaust from the back of the hut through the outer wall. An underfloor ventilation system that can be reduced is disclosed.

  However, in the underfloor ventilation system described in Patent Literature 1, air that has been heated and cooled by exchanging heat with the underground ground is indirectly heated and cooled through the inside of the outer wall, and is located near the center of the interior of the building far from the outer wall. There was a problem that the room could not be air-conditioned and the effect of reducing the air-conditioning of the entire building was small.

  Further, in Patent Document 2, one end of a heat exchange pipe 1 made of a mesh tube faces the ground outside the house, and the other end of the heat exchange pipe 1 faces the underfloor space H1 of the house H. 1 is buried in the ground at a required depth, and a heat insulating material H3 is lined on the inner surface of the outer wall H2 of the house H so that the space between the interior wall H4 and the indoor space H4 communicates with the underfloor space H1 and the ceiling space H7. One end of the indoor air introduction pipe 4 is connected to the other end of the replacement pipe 1 and the other end is connected to the room H8, and the air flowing through the wall space H5 is sucked by the first exhaust fan 5 installed in the attic space H6. Then, the air is exhausted outside the house, one end of the indoor air discharge pipe 6 is connected to the room, and the other end is connected to the suction port of the second exhaust fan 7 installed on the attic or the back of the ceiling. The exhaust fan 7 sucks indoor H8 circulating air and exhausts it outside the house. In the summer, the outdoor warm air can be exchanged with the cold in the ground to distribute the cool air through the wall space and indoors, effectively cooling and dehumidifying the entire house. Heat exchange with warm heat circulates warm air in the wall space and indoors to effectively heat the entire house, so that the facility cost can be kept low, and it can contribute to energy saving and low running cost. An air conditioner is disclosed (see claim 1 of the utility model registration request in Patent Document 2, paragraphs 0002 and 0005 of the specification, FIG. 1 of the drawings, etc.).

  However, although the underground heat utilization cooling and heating apparatus described in Patent Document 2 is certainly configured to allow the air exchanged with the underground ground to be directly introduced into the room H8 through the indoor wall H4, the two fans 5 , 7 is expensive, and the initial cost is high, and the air in the room H8 is forcibly exhausted by the second exhaust fan 7, so that the warm air is exhausted in the winter and the thermal efficiency is not good.

JP 2005-90202 A Utility Model Registration No. 3032891

  Therefore, the present invention solves the problems of the prior art, and can reduce the heat loss to the outdoor air in winter and the heat inflow from the outdoor air in summer, thereby efficiently cooling and heating the entire building, thereby saving energy. An object of the present invention is to provide an air conditioning system using geothermal heat.

  In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that heat exchange means for heat-exchanging air by exchanging heat with an underground ground of a predetermined depth or more, and ventilating air cooled / heated by this heat exchange means. A ground that cools and heats the entire building using geothermal heat, and has a cooling / warming ventilation means for cooling and heating the inside of the building and an exhausting means for exhausting air ventilated by the cooling and warming ventilation means from the back of the hut to the outside air In the heat utilization air conditioning system, the cooling / warming ventilation means includes an underfloor space for temporarily storing air cooled and heated by the heat exchange means, a wall cooling / warming path communicating with the underfloor space, and a wall cooling / warming path. A ceiling cool air passage that communicates with the ceiling, and a roof duct that communicates with the ceiling air cool passage through the back of the cabin and communicates with the outside air. , The plate material was installed up and down at predetermined intervals Has a heavy ceiling, the ceiling in the cold warm path, characterized in that it is installed so as to be below the ceiling insulation material between the double ceiling plate.

  According to a second aspect of the present invention, in the ground heat utilization air conditioning system according to the first aspect, the wall cooling / heating air passage is provided in a partition wall which is an inner wall.

  According to a third aspect of the present invention, in the geothermal air conditioning system according to the first or second aspect, the wall cooling / heating air path is provided inside an outer wall heat insulating material in the outer wall.

  According to a fourth aspect of the present invention, in the ground heat utilization air conditioning system according to any one of the first to third aspects, the outside air is communicated with the outside air and the shed space inside the exterior material of the exterior wall. An external ventilation path is provided to block heat from being transferred to the interior of the building.

  The invention according to claim 5 is the ground heat utilization air conditioning system according to any one of claims 1 to 4, wherein the outside of the outer wall heat insulating material of the outer wall communicates with the underfloor space and the attic space. A wall ventilation path is provided that prevents condensation in the wall and reduces heat inflow from the outside air or heat outflow to the outside air.

  A sixth aspect of the present invention is the underground heat-utilizing air conditioning system according to any one of the first to fifth aspects, wherein a communication port that communicates the underfloor space and the space inside the building on the upper floor is provided. Yes.

  The invention according to claim 7 is the geothermal heat-use air conditioning system according to any one of claims 1 to 6, wherein the underfloor space communicates with an underfloor vent that takes outside air into the foundation, and the underfloor vent Is openable and closable.

  The invention according to claim 8 is the geothermal heat-use air conditioning system according to any one of claims 1 to 7, wherein the exhaust means can suck air in the attic space, and the attic duct is It can be opened and closed freely.

  This invention is as described above, and according to the invention described in claim 1, heat exchange means for heat-cooling air by exchanging heat with the underground ground of a predetermined depth or more, and air-conditioning by this heat exchange means The whole building is equipped with a cooling / warming ventilation means for cooling and heating the inside of the building by ventilating the air, and an exhausting means for exhausting the air ventilated by the cooling / warming ventilation means from the back of the hut to the outside air using the underground heat A geothermal air conditioning system for cooling and heating a building, wherein the cooling / warming ventilation means includes an underfloor space for temporarily storing air cooled and heated by the heat exchange means, a wall cooling / warming path communicating with the underfloor space, A cooling / warming passage in the ceiling that communicates with the cooling / warming passage in the wall and a duct in the ceiling that communicates with the cooling / warming passage in the ceiling and communicates with the outside air through the back of the hut. The ceiling of the raised part is separated by a certain distance in the vertical direction. Since it is an installed double ceiling and the cooling and heating air passage in the ceiling is installed under the ceiling heat insulating material between the plate materials of the double ceiling, geothermal heat that does not require much running cost Double-ceiling ceiling heat insulating material that heats and heats the underground ground, which has little fluctuation throughout the year, by heat exchange means, and heats the air from the underfloor space through the wall cooling and heating airway. Because the interior of the ceiling can be cooled and heated by passing through the cooling / heating air passage inside the ceiling, the outside air is transferred from the object to the outside air through the wall cooling / heating air passage (direct heat transfer from one object to another) Heat transfer can be cut off to reduce heat loss to the outside air in winter and heat inflow from outside air in summer. In addition, it is possible to efficiently cool and heat the interior of buildings such as hallways and stairs such as indoors by using the underfloor space where the cool and warm air accumulates, the wall cool and warm air passage, and the ceiling cooling and warm air passage inside the ceiling insulation. it can. For this reason, the air-conditioning load in a room can be reduced and energy saving can be achieved.

  According to the second aspect of the present invention, in the ground heat utilization air conditioning system according to the first aspect, the wall cooling / warming air passage is provided in the partition wall which is the inner wall. Air that has been air-conditioned and heated will pass through the partition walls that are both inside the building, and the room can be more efficiently air-conditioned.

  According to the invention described in claim 3, in the geothermal air conditioning system according to claim 1 or 2, the wall cooling / warming path is provided inside the outer wall heat insulating material in the outer wall. The inside of the building can be efficiently cooled and heated by the wall cooling / heating passage provided inside the outer wall heat insulating material while blocking heat transfer with the outside air in the wall cooling / heating passage inside the outer wall.

  According to a fourth aspect of the present invention, in the ground heat utilization air conditioning system according to any one of the first to third aspects, the outside wall communicates with the outside air and the shed space inside the exterior material. Since the external air passage that shields the heat of the material from being transmitted to the inside of the building is provided, the heat transfer can be shielded by the external air passage. For this reason, in summer, heat from exterior materials heated by solar radiation (radiant heat from the sun) is reduced from penetrating into the air-conditioned building (indoors), and in winter, from the heated building interior (indoors) to the cold outside air The heat loss can be reduced.

  According to a fifth aspect of the present invention, in the ground heat utilization air conditioning system according to any one of the first to fourth aspects, the outer wall of the outer wall of the outer wall communicates with the underfloor space and the cabin space. In addition, there is a wall ventilation path that prevents condensation in the wall and reduces heat inflow from the outside air or heat outflow to the outside air. Moisture can be discharged, condensation in the wall can be prevented, and heat inflow from the outside air or heat outflow to the outside air can be reduced.

  According to a sixth aspect of the invention, in the geothermal air conditioning system according to any one of the first to fifth aspects, a communication port is provided for communicating the underfloor space with the space inside the building on the upper floor. Therefore, it is possible to use indoor air that has been air-conditioned and heated by another air-conditioning equipment instead of outside air as the air supply destination to the underfloor space, and more efficiently, heat loss to the outside air in winter and outside air in summer in the entire building It is possible to reduce the heat inflow and save energy.

  According to a seventh aspect of the present invention, in the geothermal air conditioning system according to any one of the first to sixth aspects, the underfloor space communicates with an underfloor ventilation port for taking outside air into the foundation. Since the ventilation opening is openable and closable, outside air can be taken in from the underfloor ventilation opening, and it is possible to switch to natural ventilation by stopping the exhaust means when air conditioning is not required. For this reason, further energy saving can be achieved.

  According to an eighth aspect of the present invention, in the geothermal air conditioning system according to any one of the first to seventh aspects, the exhaust means is capable of sucking air in the attic space and the attic space. Since the duct is openable and closable, the air in the cabin space can be forcibly exhausted by the exhaust means. Further, not only the wall cooling / warming path and the ceiling cooling / warming path but also the adjustment of the ventilation amount of the external ventilation path and the wall ventilation path can be performed by the exhaust means. For this reason, taking into consideration the influence of rainy season, typhoon, etc., increase or decrease the ventilation volume of the external ventilation path or the ventilation path in the wall according to the wetness of the exterior materials (including the backing insulation) or according to the outside temperature In addition, energy saving can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a vertical sectional view which shows typically the case where the underground heat utilization air conditioning system which concerns on Example 1 of one embodiment of this invention is applied to a 2-story wooden detached house. It is a vertical sectional view mainly showing a perforated pipe, a heat exchange pipe, and a circulation pump of the heat exchange means according to the first embodiment. It is a top view of the underground pit in which the heat exchange means same as the above was stored. It is a top view which shows the simple substance of the heat exchange panel of the heat exchange means which concerns on Example 1 according to type. (A) is a general part type, (B) is a U-turn part type. It is a vertical sectional view of the single body of a heat exchange panel same as the above. It is a vertical sectional view mainly showing the periphery of the foundation of the building of FIG. It is a 1st floor top view which mainly shows allocation of a heat exchange panel same as the above. FIG. 3 is a first floor plan view mainly showing an underfloor communication port of the cool / warm air ventilation means according to the first embodiment. It is a vertical sectional view mainly showing the inner wall of the building shown in FIG. It is a vertical sectional view mainly showing the outer wall of the building shown in FIG. FIG. 6 is a vertical sectional view schematically showing a geothermal air conditioning system according to a second embodiment.

  A geothermal air conditioning system according to an embodiment of the present invention will be described below with reference to the drawings.

  Implementation of the present invention by exemplifying the case where the present system is applied to a two-story wooden experimental house building by a panel method with a core scale of about 5.46m x 5.46m (see Fig. 8 etc.) An outline of the overall configuration of the geothermal air conditioning system according to Example 1 will be described. Reference numeral 1 shown in FIG. 1 is a geothermal air conditioning system according to the present embodiment. The geothermal air conditioning system 1 performs heat exchange with the underground ground having a predetermined depth or more to heat and cool the air. Means 2, cooling / heating air ventilation means 3 for cooling / heating the interior of the building by ventilating air cooled / heated by the heat exchange means 2, and exhaust means for exhausting the air ventilated by the cooling / heating air ventilation means 3 from the back of the hut to the outside air 4 or the like.

(Heat exchange means)
As shown in FIG. 1, the heat exchanging means 2 includes a perforated pipe 21 embedded in a heat collecting hole for heat excavation excavated in the ground, and a heat exchanging pipe 22 provided in the perforated pipe 21. A heat exchange panel 23 that is in communication with the heat exchange pipe 22 and is laid on a pressure-resistant panel of a solid foundation of the building, and a circulation that circulates a liquid as a heat medium in the heat exchange pipe 22 and the heat exchange panel 23. It comprises a pump 24 and the like, and has a function of heat-exchanging air between the heat medium flowing through the heat exchange pipe 22 and the underground ground to cool and heat the air in an underfloor space 31 described later by the heat exchange panel 23.

  As shown in FIGS. 1 and 2, the perforated pipe 21 is inserted into a heat collecting hole 21a having a predetermined depth (5 m in this embodiment) or more at which the temperature is kept almost constant throughout the year. It is a perforated tube which is made of a vinyl chloride tube having a diameter of about φ200 mm and reaches the vicinity of the bottom of the heat hole 21a, and has a large number of holes formed in the whole or in the lower part. For this reason, the groundwater easily enters the pipe, and the underground heat of the underground ground and the heat medium flowing in the heat exchange pipe 22 are easily exchanged with heat. Moreover, as shown in FIG. 2, it is preferable to wind concrete around the perimeter of the perforated pipe 21 for fixing and reinforcing the upper end portion.

  As shown in FIGS. 2 and 3, the heat exchange pipe 22 is basically not limited to the material of the pipe material, but preferably has a high thermal conductivity (heat transfer coefficient) for heat exchange with the underground ground. In the embodiment, it is composed of a metal tube having a diameter of about 50 mm. The heat exchange pipe 22 is provided with a flow setter valve 22a for adjusting pressure, a strainer 22b for removing solid impurities, other valves 22c, a flow setter 22d, and the like (see also FIG. 7).

  The heat medium circulating in the heat exchange pipe 22 may be water (tap water), but it is preferable to use an antifreeze liquid in an area where there is a risk of freezing. In this embodiment, propylene glycol is the main component. The antifreeze is used.

  As shown in FIGS. 4 to 7, the heat exchange panel 23 is made of a resin material such as polypropylene having a predetermined strength as a base 23a (especially, see FIG. 4), and a thin tube 23b of heat-resistant resin such as polybutene (see FIG. 5). ) Is composed of two types of panels (Fig. 4 (A) is 800 mm x 400 mm, (B) is 400 mm x 400 mm), and a solid foundation concrete slab S (withstand pressure) A plurality of flat plates are laid out on top of each other to join the dovetail joints, and the thin tubes 23b (see FIG. 5) are fitted into the grooves 23c of the base 23a while being connected to each other, thereby exchanging heat. A meandering pipe 23d meandering in the horizontal direction connected to the pipe 22 is formed (particularly, see FIG. 7). The meandering pipe 23d passes through the heat exchange pipe 22 to exchange heat with the ground deep underground. A heating / cooling heat medium (antifreeze) flows in, and contacts with air in an underfloor space 31 described later to exchange heat with the heat medium, thereby cooling and heating.

  In addition, as shown in FIG. 5, the heat exchange panel 23 is provided with a heat insulating material 23e such as polyurethane foam below the narrow tube 23b, and the heat transfer resistance on the concrete slab S side is high, and the inside of the narrow tube 23b. In order to prevent heat from escaping from the heat medium flowing through the concrete slab S in winter, it is difficult for heat to flow in from the concrete slab in summer.

  The circulation pump 24 is capable of applying a pressure at which a liquid heat medium can reach the lowermost part of the heat exchange pipe 22 and can be recirculated, and can be sent through a meandering pipe 23d composed of a thin tube 23b. Any pressure pump can be used.

The heat exchange means 2 has been described by exemplifying the air cooling / heating of the air in the underfloor space 31 through the heat medium of the antifreeze liquid, but the heat exchange pipe 22 etc. directly in the heat collecting hole 21a from the underfloor space 31 Heat exchange means that directly cools and heats the air may be used, and if heat exchange means that employs a heat pump is used, the efficiency of heat exchange is further improved. Moreover, although the thing which provided the heat collection hole 21a in the exterior of the foundation G of a building was illustrated, of course, you may provide a heat collection hole under the pressure | voltage resistant board S of a foundation, as shown in FIG. The efficiency of air conditioning is improved by providing a plurality of heat collecting holes.
In short, the heat exchanging means 2 may adopt other known heat exchanging means regardless of the configuration and the number of installed heat exchange means 2 as long as it can heat and cool the air by exchanging heat with the underground ground of a predetermined depth. Is possible.

(Cooling and warming ventilation means)
Next, the cooling / heating air ventilation means 3 will be described with reference to FIGS. 1, 6, and 8 to 10.
As shown in FIG. 1, the cool / warm air ventilation means 3 includes an underfloor space 31 for temporarily storing air cooled and heated by the heat exchange means 2, wall cool / warm air passages 32 and 33 communicating with the underfloor space 31, The inside cooling / warming passage 34 communicated with the body cooling / warming passages 32, 33, and the roof duct 35 communicating with the ceiling cooling / warming passage 34 through the back of the hut to the outside air. It has the function of cooling and heating the inside of the building by ventilating air that has been air-conditioned and heated.

  As shown in FIGS. 1 and 6, the underfloor space 31 includes a foundation of a building, that is, a foundation slab G and a concrete slab S which is a pressure platen, and a floor F1 (large floor in this embodiment) on the upper floor (in this embodiment). In this under-floor space 31, the heat exchange panel 23 cools and cools the surrounding air and temporarily stores it. doing. This underfloor space 31 has a certain size, is surrounded by a concrete foundation having a large heat capacity and a small temperature change, and is not affected by solar radiation because the building covers the upper part. It is a suitable place for temporary storage.

  In addition, as shown in FIG. 1, the foundation beam G is provided with an underfloor ventilation opening G1, which is openable and closable. Thus, it is possible to select whether to store air cooled or heated by the heat exchange means 2.

As shown in FIGS. 1 and 8, the floor F1 on the first floor is formed with three 100mm square underfloor communication openings F1a that communicate with the space inside the building on the first floor. The mouth G1 is closed, and the indoor air on the first floor can be supplied to the underfloor space 31 from the underfloor communication port F1a.
For this reason, as a supply source of air to the underfloor space 31 that is air-conditioned by the heat exchange panel 23 of the heat exchange means 2, not only the outside air but also an air conditioner (not shown) installed in the first floor room different from the heat exchange means 2 ) Can be used, and the energy can be saved more efficiently by reducing heat loss to the outside air in winter and heat inflow from outside air in summer in the entire building.
If the underfloor space 31 is about the size shown (assuming 5.35 m × 5.35 m × 0.4 m≈11.45 m ³ ), it is sufficient that there are about three 100 mm square underfloor communication ports F1a. It goes without saying that the size, installation location, installation position, etc. of the underfloor communication port can be appropriately changed according to the scale of the building.

  As shown in FIGS. 1 and 9, the wall cooling / warming path 32 is formed by striking 30 mm thick timber at appropriate intervals on both sides of the outer surface of the core panel IW0 made of a crosspiece and a plate material. Affixed with a gap of about 30 mm formed on the left and right sides (in the vertical cross section) of the partition wall IW, which is the inner wall, by attaching a 5 mm thick gypsum board. The first-floor inner wall cooling / warming passage 32a is formed in the first floor portion (first-floor partitioning wall IW1) of the partition walls IW, and the second-floor inner wall cooling / warming passage 32b is formed in the second-floor portion (second-floor partitioning wall IW2). Is formed.

This wall cooling / warming passage 32 communicates with the underfloor space 31 through a lower wall communication port 32c formed in the floor immediately below the first floor partition wall IW1, and is on the wall formed on the ceiling directly above the second floor partition wall IW2. The communication port 32d communicates with a cooling / heating passage 34 in the ceiling, which will be described later, and has a function of cooling and heating the interiors of buildings such as indoors, corridors, and stairs by ventilating air that has been heated and cooled in the underfloor space 31. .
For this reason, the air inside and outside the building can be efficiently air-conditioned by allowing the air cooled and heated by using the underground heat to pass through the partition wall IW whose both sides are the inside of the building.

  Further, as shown in FIG. 1 and FIG. 10, the wall cooling / warming passage 33 is struck with a 30 mm thick timber at an appropriate interval as a spacer inside the outer surface of the core panel OW0 made of a crosspiece and a plate material. By affixing a 9 mm thick softwood plywood, it is a ventilation path consisting of a gap of about 30 mm formed inside the outer wall OW, and the first floor portion of the outer wall OW formed through the first floor to the second floor ( A first-floor outer wall cooling / heating passage 33a is formed in the first-floor outer wall OW1), and a second-floor outer wall cooling / heating passage 33b is formed in the second-floor portion (second-floor outer wall OW2).

  This wall cooling / warming passage 33 communicates with the underfloor space 31 through a lower wall communication port 33c formed in the floor immediately below the first floor outer wall OW1, and is connected to the upper wall formed in the ceiling directly above the second floor outer wall OW2. 33d communicates with a ceiling cooling / heating passage 34, which will be described later, and has a function of cooling and heating the interior of the building such as each room, corridor, and stairs by ventilating the air that has been cooled and heated in the underfloor space 31. For this reason, the inside / outside wall heat insulation path 33 in the outer wall OW blocks the heat transfer with the outside air, and is provided inside the outer wall insulation D to be described later, thereby efficiently cooling / heating the inside of the building. Can do.

  The reason why softwood plywood was used as the indoor plywood is because it uses a phenol-formaldehyde resin adhesive that has low formaldehyde emission because it is stable. Of course, boards can also be used.

<Inside wall ventilation path>
As shown in FIGS. 1 and 10, an outer wall heat insulating material D1 made of a non-combustible material such as glass wool is unevenly inserted into the outer wall OW on the inner side (inside the building) inside the core panel OW0, and the core panel OW0. A gap space is formed at 30 mm on the outer side, and this gap serves as a ventilation passage 5 in the wall.

  This wall passage 5 includes a first-floor wall passage 51 and a second-floor passage 52, and is connected to the underfloor space 31 by a lower wall communication port 53 formed on the floor immediately below the first-floor outer wall OW1. Communicating with the back of the hut space through a communication port 54 on the wall formed in the ceiling directly above the second floor outer wall OW2, and the air from the underfloor space 31 to the first floor wall ventilation path 51 and the second floor wall ventilation path. By flowing into the attic space through 52, the moisture containing moisture leaking from the room is prevented from condensing inside the wall due to the temperature difference between the inside and outside of the outer wall heat insulating material D1, and by heat transfer from the outside temperature It has a function of reducing the heat inflow from the outside air or the heat outflow to the outside air by escaping the warmed or cooled air from the back of the cabin. Therefore, moisture leaked from the room can be discharged while shielding heat transfer by the wall ventilation path 5, preventing condensation in the wall and reducing heat inflow from the outside air or heat outflow to the outside air. Can do.

<External ventilation path>
In addition, on the outer wall OW, the outer surface of the core panel OW0 (surface on the outside of the building) is struck with 30 mm thick lumber as a spacer at an appropriate interval, and a general galvalume steel plate or siding plate is used. An exterior material E is attached, and an external ventilation path 6 having a gap of about 30 mm is formed inside the exterior material E.

  This external ventilation path 6 is composed of a first-floor external ventilation path 61 and a second-floor external ventilation path 62, communicates with the outside air through an outside air communication port 63 provided immediately below the first-floor outer wall OW 1, and is formed on the second-floor outer wall OW 2. It communicates with the back of the hut space through the hut back communication port 64 provided directly above, and has a function of shielding heat transfer from the exterior material E by the external air passage 6 by ventilating the inside of the exterior material E. ing. For this reason, in summer, heat from exterior materials heated by solar radiation is reduced from entering the cooled building (indoors), and in winter, heat loss from the heated building (indoors) to the chilled outside air is reduced. be able to. Further, even if the exterior material E is lined with a heat insulating material (not shown) such as polyurethane foam, it is possible to prevent the mold from growing by dehumidification by ventilation and leaving the heat insulating material wet.

  As shown in FIGS. 1 and 9, the ceiling cooling / warming passage 34 has a 12.5 mm thick gypsum board attached under a normal ceiling foundation such as a ceiling joist, and a 30 mm thick timber as a spacer below it. Is attached at an appropriate interval, and a gypsum board with a thickness of 9 mm is attached below it. In addition to communicating with the wall cooling and warming passages 32 and 33 through the above-mentioned communication ports 32d and 33d on the wall, the air passage is connected to a hut back duct 35, which will be described in detail later. It has the function of cooling and heating the inside of the building by ventilating the air.

  Further, the ceiling heat insulating material D2 made of non-combustible material such as glass wool that shields heat transfer from the outside air through the shed space is above the 12.5 mm thick gypsum board that is above the cooling / heating air passage 34 in the ceiling. Therefore, the inside of the building can be efficiently cooled and heated from the inside of the ceiling heat insulating material D2 by the cooling / heating air passage 34 in the ceiling. For this reason, especially in the summer, the air inside the building is cooled and lowered by the air cooled by the heat exchange means 2 passing through the ceiling cooling / warming passage 34, and the relatively hot air rises. Since it descends in contact with the ceiling cooling / warming passage 34 via the gypsum board, the inside of the building can be efficiently cooled while being convected.

  As shown in FIG. 1, the shed duct 35 is a duct made of an aluminum flexible pipe, a spiral pipe made of galvanized steel plate, etc., and communicates with the above-described ceiling cooling / warming passage 34, It is a duct that reaches outside air from the gable face of the gable roof, and is provided with exhaust means 4 to be described in detail later, and exhausts the air in the communicating air passage such as the cooling / heating air passage 34 in the ceiling to the outside air. This is a passage for forced exhaust by means 4.

(Exhaust means)
Next, the exhaust means 4 will be described with reference to FIG.
The exhaust means 4 is mainly composed of an exhaust fan 40 which is a general axial fan capable of adjusting the exhaust amount (air flow rate), and is capable of sucking air in the shed back duct 35 and the shed space. The air has a function of forcibly exhausting the air to the outside air. The exhaust fan 40 has a shutter 41 that can freely open and close the shed duct 35, and by opening and closing the shutter 41, both the air in the air passage communicating with the shed duct 35 and the air in the shed space are provided. It is possible to select whether to forcibly exhaust by sucking the air or to forcibly exhaust only the air in the cabin space.

In addition, the exhaust means 4 has a hut back top on-off valve 42 at the top of the roof of the building, and the air in the back of the hut can be naturally ventilated from the hut back top on / off valve 42.
In addition, although the general axial fan was illustrated as an exhaust fan, the fan of the total heat exchange type which exchanges heat and humidity between the air taken in and the air taken in from external air can also be used. In addition, the efficiency of air conditioning is improved.

(Operation of underground heat utilization air conditioning system)
[summer]
Next, the operation of the ground heat utilization air conditioning system 1 according to the first embodiment will be described with reference to FIG. First, in the summer, when the entire building is cooled using the geothermal air conditioning system 1, the underfloor vent G1 and the hut back top on-off valve 42 are closed, the shutter 41 is opened, and the shed duct 35 is opened. In this state, the exhaust fan 40 is operated. Then, air is sucked from the cooling / heating air passage 34 in the ceiling communicating with the roof duct 35 and air in the roof space is sucked.

  Heat transfer from the exterior material E that is heated by solar radiation, etc., generated by an air flow in the internal ventilation path 5 and the external ventilation path 6 that communicates with the back space, the communication port 54 on the wall, and the communication port 64 on the wall By releasing the air that has become hotter from the back of the cabin to the outside air, the heat inflow from the outside can be reduced.

  At the same time, an air flow is generated in the wall cooling / warming passages 32, 33 communicating with the cooling / warming passage 34 in the ceiling, the communication port 32d on the wall, and the communication port 33d on the wall. The air in the underfloor space 31 that is exchanged and cooled to about 20 ° C. passes through the wall cooling / heating passages 32 and 33 and the ceiling cooling / heating passage 34, and is exhausted from the cabin back duct 35 to the outside air. For this reason, the air cooled to about 20 ° C. through a thin plate material (12.5 mm thick gypsum board or 9 mm thick softwood plywood) when passing through the wall cooling / warming passages 32 and 33 and the ceiling cooling / heating passage 34. The air inside the building in contact with the air can be efficiently cooled, and the cooling load in summer can be reduced.

  Especially in the summer, the air inside the building on the top floor (second floor in FIG. 1) is cooled and lowered by the air cooled by the heat exchanging means 2 passing through the cooling / heating passage 34 in the ceiling. The hot air rises and comes into contact with the cool air in the ceiling cool / warm passage 34 through a thin plate material (gypsum board) and descends again, so that the inside of the building can be efficiently cooled while being convected. At this time, since the first floor portion can be cooled from the atrium space such as stairs, the entire building can be cooled very efficiently. Further, if necessary, a communication port that connects the first floor and the second floor can be provided to cool the entire building evenly.

  In addition, the supply of air to the underfloor space 31 is performed not from outside air through the underfloor ventilation port G1, but from the inside of the first floor building through the underfloor communication port F1a. In winter, energy used for heating, the same applies hereinafter) can be efficiently saved by reducing heat inflow from outside air temperature without wasting energy.

In the operation at this time, when the shed back top opening / closing valve 42 is opened, outside air flows into the shed space through the shed back top opening / closing valve 42, and the air flow generated in the wall ventilation path 5 and the external ventilation path 6 is generated. Can be reduced. That is, according to the wet state of the exterior material E (for example, after a typhoon or heavy rain, the rainy season, etc.), the amount of solar radiation, the outside temperature, etc. The amount of ventilation in the external ventilation path 6 can be adjusted, and the entire building can be cooled and heated more effectively and economically.
Further, it goes without saying that the ventilation rate can be adjusted not only by opening / closing the hut back top opening / closing valve 42 but also by changing the rotational speed of the exhaust fan 40 per hour.

[winter]
Next, with reference to FIG. 1, a description will be given of heating the entire building using the underground heat utilization air conditioning system 1 in winter.
In this case, as in the summer, the exhaust fan 40 is operated in a state in which the underfloor ventilation opening G1 and the hut back top opening / closing valve 42 are closed and the shutter 41 is opened and the shed duct 35 is opened. Then, air is sucked from the cooling / heating air passage 34 in the ceiling communicating with the roof duct 35 and air in the roof space is sucked.

At this time, an air flow is generated in the wall ventilation path 5 and the external ventilation path 6, and the heat transfer from the room is blocked by this air flow, and the heat of the heated indoor air is prevented from escaping to the outside air. The heat loss in winter can be reduced, and the heat exchange means 2 exchanges heat with the underground ground via the thin plate material 15 when passing through the wall cooling / heating passages 32, 33 and the ceiling cooling / heating passage 34. It is possible to efficiently heat the air inside the building that comes into contact with the air heated to about ℃.
Further, similarly to the above, according to the outside air temperature, the snow condition, etc., the ventilation amount in the wall ventilation path 5 and the external ventilation path 6 can be adjusted by opening / closing the hut back top opening / closing valve 42.

  In particular, in winter, air containing moisture leaked from the room is rapidly cooled by the outside air temperature at the boundary of the outer wall insulation material, so that it falls below the dew point temperature, causing condensation within the wall, impairing the durability of the building, There is a problem that it becomes a hotbed such as and there is a risk of harming health. However, in the underground heat-utilizing air conditioning system 1, the wall cooling / heating passages 32, 33 and the ceiling cooling / heating passage 34 are heated, and at the same time, the outer wall is insulated by the ventilation of the wall ventilation passage 5 and the exhaust from the cabin space. Since ventilation and dehumidification are performed on both the inside and outside of the material D1 and the ceiling heat insulating material D2, such a problem can be solved.

[Spring, Autumn]
Next, the operation of the geothermal air conditioning system 1 according to the first embodiment will be described with reference to FIG. 1 when there is no particular need for air conditioning such as spring or autumn.
In this case, the exhaust fan 40 is stopped in a state where the underfloor ventilation port G1 and the hut back top opening / closing valve 42 are opened, the shutter 41 is opened, and the shed back duct 35 is opened. Then, ventilation occurs in each of the wall cooling / heating passages 32 and 33, the ceiling cooling / heating passage 34, the wall ventilation passage 5, and the external ventilation passage 6 due to the difference in atmospheric pressure due to the height. For this reason, running cost can be reduced without using mechanical power, wall materials and the like can always be kept in an air-dry state, and the durability of the building can be improved and energy saving can be achieved.
Furthermore, mechanical ventilation is also possible by closing the underfloor ventilation opening G1 and operating the exhaust fan 40 according to the weather, so that the wall material or the like can be kept in an air-dried state with a minimum amount of energy.

[24 hour ventilation]
In addition, a building that is in a certain airtight state is obligated by law to provide mechanical ventilation for 24 hours for the purpose of ventilation of volatile chemical substances such as formaldehyde, and it is necessary to install a ventilation fan that operates for 24 hours. However, according to the underground heat-utilizing air conditioning system 1, by closing the underfloor ventilation opening G1 and operating the exhaust fan 40 with the shutter 41 opened and the roof duct 35 open, Since all the rooms inside the building can be ventilated through the indoor ventilation openings of each room where the installation is obligatory, the above-described ventilation fan can be substituted with the exhaust fan 40 of the underground heat utilization air conditioning system 1, and this ventilation fan The installation cost and running cost can be reduced, which is economical.

  As described above, according to the ground heat utilization air conditioning system 1, the entire building can be maintained at a suitable temperature throughout the year by using the heat exchange means of the ground heat that does not require much running cost. Can be saved to save energy.

  Next, the outline of the whole structure of the geothermal air-conditioning system according to Embodiment 2 of the present invention will be described with reference to FIG. As shown in FIG. 11, the difference between the geothermal air conditioning system 1 according to the first embodiment and the geothermal air conditioning system 1 ′ according to the second embodiment is that the first floor partition wall IW1 and the second floor partition wall IW2 coasts, and a part of the ceiling on the first floor is also a double ceiling, and a ceiling cooling / heating passage 34 'similar to the ceiling cooling / heating passage 34' is provided. For this reason, according to the local medium heat utilization air conditioning system 1 ′, it is possible to further efficiently cool and heat the space below the ceiling cooling / heating passage 34 ′ on the first floor.

  As described above, the ground heat utilization air conditioning system according to the first and second embodiments of the present invention has been described. However, the present invention is not limited to the illustrated embodiment, and can be appropriately changed within the scope of the claims. Needless to say. In particular, known heat exchange means and exhaust means can be applied, and the present invention can be applied to a building made of wood by a panel method.

DESCRIPTION OF SYMBOLS 1 Air-conditioning system using geothermal heat 2 Heat exchange means 3 Cooling / warming ventilation means 31 Underfloor spaces 32, 33 Cooling / warming air paths 34, 34 'in the wall Cooling air warming path 35 in the roof Back top on-off valve 5 Ventilation path in wall 6 External ventilation path G Foundation beam G1 Underfloor ventilation opening S Concrete slab (pressure-resistant panel)
F1 1st floor (base upper floor)
F1a Underfloor communication entrance F2 2nd floor (top floor)
IW partition wall (inner wall)
OW outer wall

Claims (8)

Heat exchange means for cooling and heating the air by exchanging heat with the underground ground of a predetermined depth, cooling / warming ventilation means for cooling and heating the interior of the building by ventilating the air cooled and heated by this heat exchange means, and this cooling / warming ventilation means An air-conditioning system that uses geothermal heat to cool and heat the entire building using geothermal heat, and an exhaust means for exhausting the air ventilated from the back of the cabin to the outside air,
The cooling / warming ventilation means includes an underfloor space for temporarily storing air cooled and heated by the heat exchanging means, a wall cooling / warming path communicating with the underfloor space, and a ceiling cooling / warming path communicating with the wall cooling / warming path. And a shed back duct that communicates with the cooling air passage in the ceiling and passes through the shed to the outside air,
The ceiling of the portion in which the cooling / heating air passage in the ceiling is provided is a double ceiling in which plate materials are installed at a predetermined interval in the vertical direction, and the cooling / heating air passage in the ceiling is between the double ceiling plate materials. An underground air-conditioning system that is installed under the ceiling insulation.   The geothermal heat-use air conditioning system according to claim 1, wherein the wall cooling / warming path is provided in a partition wall which is an inner wall.   The ground heat utilization air conditioning system according to claim 1 or 2, wherein the wall internal cooling / warming passage is provided inside an outer wall heat insulating material in an outer wall.   4. An external air passage that communicates with the outside air and the cabin space and that shields heat from the exterior material from being transmitted to the interior of the building is provided inside the exterior material of the outer wall. The ground heat utilization air conditioning system described in Crab.   Outside the outer wall heat insulating material of the outer wall, there is provided a ventilation passage in the wall that communicates with the underfloor space and the shed space, prevents condensation in the wall and reduces heat inflow from the outside air or heat outflow to the outside air. The underground heat utilization air conditioning system according to any one of claims 1 to 4.   The geothermal heat-use air conditioning system according to any one of claims 1 to 5, wherein a communication port that communicates the underfloor space and the space inside the building on the upper floor is provided.   The underground heat utilization air conditioning system according to any one of claims 1 to 6, wherein the underfloor space communicates with an underfloor ventilation port for taking outside air into the foundation, and the underfloor ventilation port is openable and closable.   The ground heat utilization air conditioning system according to any one of claims 1 to 7, wherein the exhaust means can suck air in the attic space, and the attic duct is openable and closable.

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