JP2008076015A - Building air-conditioning system by geothermal use - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a building air-conditioning system by geothermal use, for air-conditioning a building, while saving energy and reducing an environmental load, by effectively using underground heat. <P>SOLUTION: A multitubular flat heat exchanger is formed by connecting an intake side header 21A and an exhaust side header 21B in an airtight state by a large number of metallic small diameter pipes 22, and is composed of at least one multitubular flat heat exchanger 20 buried in the ground of the required depth, an intake pipe 25 for introducing air-conditioning object air to the intake side header of the shell and tube flat heat exchanger, an exhaust ventilation pipe 26 having an air blowing mechanism 27 by connecting to the inside of a space for air-conditioning from an outlet of the exhaust side header of the flat heat exchanger 20, and an air-conditioning air blowoff part 8 arranged along a corner part of an indoor structural material via a proper space from the outlet side of the exhaust ventilation pipe 26. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to a building air conditioning system using geothermal heat that uses a soil temperature that is enormous in heat capacity and always kept at a substantially constant temperature, and that is used as a heat source.

In order to maintain a comfortable environment in a room or a specific space despite the hot and humid conditions in summer and the low-temperature dry conditions in winter, air conditioning that adjusts the temperature, humidity, and cleanliness of air in the space to the desired range Is required. A typical air conditioner includes a cold heat source that uses an endothermic effect that occurs in association with the compression and expansion of a refrigerant, and a heat source represented by combustion heat of various fuels such as soot, kerosene, LPG, and city gas, and solar heat. Widely used. In general residences, offices, workplaces, shops, etc., heat pump air conditioning that can be used for both cooling and heating by using the heat absorption and heat generation associated with refrigerant compression and expansion and switching the direction of refrigerant flow. Many devices are also used. In general, various filters and humidification mechanisms are often added to adjust the cleanliness and humidity of the air.

Such a widely used air conditioner uses an electric motor to drive the refrigerant compressor, and consumes a lot of electric power. Under weather conditions that require cooling or heating, the power demand for air conditioning in the area and its surroundings is concentrated. Such a trend, especially in conjunction with the effects of global warming, tends to be repeated every year with the rise in summer temperature. Such a situation in which electric power demand increases is usually dealt with by an electric power system mainly composed of a thermal power plant (and a nuclear power plant) that uses combustion heat. As the operating ratio of thermal power generation increases, emissions of combustion exhaust gas containing nitrogen oxides (NOx), sulfur oxides (SOx), etc. will increase, resulting in increased air pollution and increased carbon dioxide emissions. There is a concern that the global environment will be further exacerbated, such as global warming being accelerated. In addition, the amount of power used for the user increases and the economic burden also increases.

In consideration of such circumstances, many attempts have been made to construct an air conditioner that is friendly to the global environment while saving energy as much as possible using soil or groundwater having a large heat capacity. In Patent Document 1, for example, a heat storage tank in which water is stored in a tank buried under the ground such as under the floor, and a flexible pipe or the like is buried in the water in the heat storage tank. A geothermal air-conditioning system that performs air conditioning by circulating introduced air from one end of the vent pipe into the room is disclosed. In this system, the water temperature in the heat storage tank is determined by the underground temperature that is stable for a long period of time, and it is cooled (or heated) to a temperature close to the water temperature through the ventilation pipe buried in this tank. Air is introduced into the room to be air-conditioned.

Therefore, a facility for compressing and expanding the refrigerant to exhibit a cooling action (or heating action) becomes unnecessary, and air conditioning can be performed while saving energy. However, a relatively large underground tank is required according to the air-conditioned space, and there is a possibility that restrictions on the land area, topography, and the like at the installation location will increase.

Patent Document 2 discloses a heat storage chamber that has an outside air passage around and is formed under the floor of a building, a heat exchange pipe that is buried in the ground and whose open end communicates with the heat storage chamber, a floor under the building, a room And an air passage system formed on the ceiling and communicating with the heat storage chamber, and a dehumidifier for dehumidifying the air supplied into the air passage, using a geothermal heat, wherein the heat exchange pipe The air conditioning system which adjusts the room temperature in a building is distribute | circulated in the air path through the air which was cooled or heated by geothermal heat and was dehumidified by the said dehumidifier.

In the dehumidifier or in the vicinity thereof, a filter for performing antibacterial and the like of air circulated in the air passage is disposed. In this air conditioning system, the heat storage chamber formed under the building floor with an outside air passage around it becomes a fairly large facility that integrates with the building. Is difficult to apply.

In Patent Document 3, a heat exchanger for exchanging heat between water as a heat medium and air flowing through an air flow passage is installed in a residential area, an underfloor space, a ceiling space, and the like. A residential air-conditioning system using groundwater is disclosed that is configured to allow air in a heat exchanger to flow out of a flow passage and convect it in a residential area. The heat medium flow passage of these heat exchangers is formed as a closed circuit, and a ground water circulation passage that circulates ground water that performs heat exchange with geothermal heat is used as a heat source side passage of the heat pump that uses this closed circuit as an additional passage. Provided. The air conditioning system of Patent Document 3 performs indoor air conditioning while naturally convection of air in a residential area by combining a plurality of heat exchangers and using the temperature of groundwater. This system is complicated because a plurality of heat exchangers are used as the apparatus, and a large amount of groundwater circulation is used, so that there is a high possibility of being restricted in installation and operation.
JP 2001-41479 A JP 2005-201443 A JP 2005-207704 A

An object of the present invention is to provide a building air-conditioning system using geothermal heat for air conditioning of a building while saving energy and reducing environmental load by effectively using geothermal heat with a simple configuration.

The invention according to claim 1 is a multi-tubular flat heat exchanger in which an intake side header 21A and an exhaust side header 21B are connected so as to be airtight by a plurality of metal thin tubes 22. For introducing air to be conditioned into at least one multi-tube flat heat exchanger 20 embedded in the ground at a required depth and the intake-side header 21A of the multi-tube flat heat exchanger An air intake pipe 25 communicates with an air-conditioning space from an outlet of the discharge side header 21B of the flat heat exchanger, and a discharge vent pipe 26 having a blower mechanism 27, and an outlet side of the exhaust vent pipe. It is an air conditioning system for buildings using geothermal heat, which is composed of an air conditioned air discharge part 8 disposed along the corner of the indoor structural material through an appropriate space.

According to the second aspect of the present invention, the main portion of the multi-tubular flat heat exchanger 20 has 20 to 30 metal thin tubes that connect the intake side and discharge side headers 21A and B in an airtight state. It is a building air conditioning system using geothermal heat, characterized in that it is a group of stainless thin tubes joined in a two-stage staggered arrangement.

The invention according to claim 3 is a building air-conditioning system using geothermal heat, wherein a plurality of the multi-tubular flat heat exchangers 20 are arranged at appropriate intervals.

In the invention according to claim 4, the multi-tubular flat heat exchanger 20 that is installed in a plurality at appropriate intervals can be operated in any combination of alternate operation or parallel simultaneous operation by operation of switching means according to heat demand. It is a building air conditioning system using geothermal heat, which can be selected by

According to a fifth aspect of the present invention, there is provided a path that does not inhibit the temperature control effect depending on whether the path for introducing the air whose temperature is adjusted by the multi-tubular flat heat exchanger 20 into the air-conditioned space is the heating period or the cooling period. It is a building air conditioning system using geothermal heat, characterized in that it can be switched to.

The invention according to claim 6 is the geothermal heat characterized in that the air-conditioning air discharge part is a ventilation skirting board 8A, B which is disposed horizontally at the joint between the floor and the wall and forms a large number of ventilation holes. It is a building air conditioning system by use.

The invention according to claim 7 is a geothermal use characterized in that the air-conditioning air discharge part is a processed product in which a large number of ventilation holes are formed in a material arranged substantially vertically along the column and wall joint part. The invention according to claim 8 is a processed product in which a large number of ventilation holes are formed in a material in which the air-conditioning air discharge portion is disposed horizontally along the long press and the wall joint portion. This is a building air-conditioning system using geothermal heat.

The invention according to claim 9 is a processed product in which a large number of ventilation holes are formed in a material in which the air-conditioning air discharge portion is disposed horizontally along a joint portion between a peripheral edge (ceiling peripheral edge) and a wall. It is a building air conditioning system using geothermal heat.

The building air-conditioning system using geothermal heat according to the present invention performs heat exchange with intake air in a heat exchanger embedded in the ground in order to use a stable soil temperature regardless of atmospheric temperature while maintaining a large heat capacity. The air conditioning in the desired space is performed by introducing into the room the air that has been lowered and heated (or raised in temperature) and dehumidified. For example, the soil temperature in the ground, which is about 4-6 meters from the ground surface and does not cause freezing or inundation, is almost stable at around 14-18 ° C throughout the year. It pays attention to the fact that it can be expected to be environmentally friendly air-conditioning equipment while saving energy by using it as a heat source.

In this case, the heat exchanger buried in the ground needs to exchange heat efficiently while the air to be cooled or heated passes, so that the contact area with the surrounding soil should be increased. It is configured as a multi-tubular flat heat exchanger in which a header (also referred to as “pipe header”) and a discharge-side header are connected so as to be airtight with a large number of metal ventilation thin tubes. As a result of arranging the metal thin tube groups in a flat manner in this way, the contact surface between the surrounding soil and the heat exchange portion thin tubes is widened, and thus the heat exchange efficiency is improved.

Stainless steel pipes are preferred for ventilating thin tubes with an outer diameter of about 20-30 mm because they are used for a long time in a state where they are buried in the ground, so that the opposing surfaces of the ventilation inlet side header and the discharge side header are in an airtight state. It is joined by means such as welding, and as a whole, it is formed in a flat shape by both headers and a large number of, for example, about 20 to 30 ventilation thin tubes. Therefore, compared with a cylindrical or thick tubular heat exchanger, the contact area with the surrounding soil is increased, and high-efficiency heat exchange can be expected. Although the length of the ventilation thin tube can be determined by the volume of the space to be air-conditioned, for example, a standard configuration in which the number of ventilation thin tubes having a length of about 1.5 m to 2 m, for example, about 20 to 30 is configured. The heat exchange capacity can be adjusted by increasing or decreasing the length of the thin tubes and the number of tubes used. If even greater heat exchange capacity is required, install multiple heat exchangers of the standard size and switch between them as appropriate to change the outside air temperature or reduce the number of people in the room. It is possible to achieve a heat exchanging capacity that adapts to changes in heat demand due to a large number of factors.

Air that has been temperature controlled by an underground heat exchanger is switched to increase rather than hinder the air conditioning effect when introduced indoors. During the summer cooling season, the air that has fallen below the outside temperature is led to the lower air chamber formed under the floor of the building, and passes through the hollow part of the double-layered wall of the lower wall (the first floor) From the first floor to the upper floor, and during that time, it is blown out toward the indoor side through a ventilated product with an air blowing opening attached to the wall of each room, for example, a vent skirting board . On the other hand, in the winter season (heating season), air heated to a temperature higher than the outside air temperature is guided to the upper air chamber formed in the attic of the building, and is warmed by solar heat transmitted through the roofing material. The air is mixed with the heated air and becomes heated air. And the heated air once sent into the lower air chamber flows from the lower floor to the upper floor through the hollow portion of the multilayer wall, while the processed product with the air blowing opening attached to the wall in each room during that time, For example, it blows out indoors through a ventilation skirting board. By adopting such a configuration, in the cooling period, air is sent from the lower air chamber under the floor to each room without causing a temperature rise of the cooling air, and in the heating period, the heat exchange air is once sent to the upper air chamber in the attic. Since the temperature-raised air that takes into account the temperature rise due to solar heat is sent from the lower air chamber to each room, the air conditioning efficiency can be improved.

The building air-conditioning system using geothermal heat according to the present invention configured as described above takes the amount of heat held by the soil into the circulating air in the heat exchanger, and uses it as a cooling and heating source for air conditioning in the target space. . Therefore, power (excluding power saving for blowing) as well as heat of combustion from liquid fuel or gaseous fuel is not used as a heat source. This eliminates the need for electricity charges and fuel costs for the heat source, greatly contributes to energy conservation, and reduces the demand for power, thereby reducing the amount of carbon dioxide that is the cause of global warming. Moreover, since each heat source is exchange heat based on heat transfer of air-conditioning air from the soil, there is no concern of overcooling (or overheating), so-called social conditions such as infants, the elderly, and sick patients. A mild air conditioning system that is easy to use for the weak can be obtained.

Hereinafter, embodiments of the present invention will be disclosed with reference to the accompanying drawings. FIG. 1 is an overall configuration diagram showing a configuration example of a building air conditioning system using geothermal heat according to the present invention. The building 1 to be air-conditioned is represented as a two-story house having a multi-layer air flow path with a double wall surface of an outer wall 2 and an inner wall 3. An upper air chamber 4 is formed in the attic, and a lower air chamber 5 is formed under the floor. Between these air chambers 4 and 5, an air supply duct (lowering) 6 is provided for communicating air for air conditioning, and the upper air is driven by driving a circulation fan 7 installed in the upper air chamber 4. The air in the chamber 4 can flow toward the lower air chamber 5.

Ventilation skirting boards 8A and 8B are provided as air-conditioned air discharge parts provided with a large number of openings along the joints between the floor surface and the inner wall of the room of the building 1. A connecting portion between the floor of the room of the building 1 and the inner wall, and on the back side of the vent skirting boards 8A and 8B, there are communication ports with the air flow path between the inner and outer walls. It is comprised so that the conditioned air which passes the air flow path of a hollow part may be blown off to indoor space. In this case, the opening of the lower floor ventilation skirting board 8A and the opening of the upper floor ventilation skirting board 8B close to the lower air chamber 5 can be changed into the upper and lower layer rooms by appropriately changing the diameter and / or the number of openings. By adjusting the air flow rate, the effect of air conditioning can be adjusted appropriately. Furthermore, it is also possible to adjust the air conditioning effect by preparing an opening cover and reducing the amount of blown air.

The effect of the air conditioning can be adjusted by speed-controlling the drive motor of the circulation fan 7 in FIG. Note that an air supply duct 9 (up) extending vertically from the lower air chamber 5 under the floor to the upper air chamber 4 on the left hand side of the building 1 is subjected to heat exchange in a heat exchanger 20 described later, resulting in a temperature drop, The air that has been heated and dehumidified, that is, that has been subjected to the air conditioning process, is sent to the upper air chamber 4. In addition, although the air supply duct 6 connected from the upper air chamber 4 to the lower air chamber 5 and the air supply duct 9 from the lower part to the upper part are illustrated as penetrating the room for the convenience of disclosure, they are actually arranged along walls and pillars. It is arranged so as not to be a hindrance in practice.

The lower left of FIG. 1 shows a multi-tubular flat heat exchanger 20 that is buried underground in the vicinity of the building 1 and cools or heats the passing air by heat exchange with geothermal heat. The heat exchanger 20 is welded so as to be in an airtight state between a plurality of, for example, about 20 to 30 stainless thin tube groups 22 between the intake side header 21A and the discharge side header 21B. The stainless thin tubes constituting the stainless thin tube group 22 are, for example, straight tubes having a diameter of about 20 to 30 mm and a length of about 1.5 to 2 m, and both end portions are airtight between the opposing surfaces of both headers 21A and 21B. It is welded to be in a state.

When only one heat exchanger 20 is used, the heat exchange capacity can be adjusted by changing the size and number of stainless thin tubes. Here, the adjustment of the heat exchange capacity means taking into consideration the total volume of the space in which air conditioning is to be performed, the number of rooms, the desired air conditioning temperature, and the like. In addition, create a standard heat exchanger of an appropriate size, install multiple heat exchangers according to the size and application of the building, and make it possible to switch between alternate operation and parallel simultaneous operation. Therefore, it is possible to optimize the operation according to the change of the outside air temperature and the heat demand in the building. A specific configuration of the heat exchanger 20 will be described later.

The left side of the heat exchanger 20 in the drawing shows a configuration for taking in outside air from which dust or the like has been removed. The outside air inlet 23, a filter 24 for purifying air by collecting floating dust and the like, and an intake pipe An outside air introduction means for taking in outside air into the heat exchanger 20 via 25 is configured. The configuration of such outside air introduction means is preferably selected in consideration of the geographical features of the installation location, the orientation of the building and the heat exchanger installation location, location conditions such as sunlight.

The right side of the heat exchanger 20 shows a configuration in which air that has undergone heat exchange between geothermal heat and passing air in the heat exchanger 20 is sent into the building 1 that is the air conditioning target. An air intake fan 27 is disposed near the lower air chamber 5 below the floor of the building 1. The intake fan 27 determines the amount of passing air in the air conditioning system according to the present invention, and thus the total volume of air to be conditioned, and determines the air conditioning capacity of the entire apparatus. Therefore, the drive motor of the intake fan 27 has at least a multi-stage control such as a strong / weak 2 stage and a strong / medium / weak 3 stage with respect to the rated capacity. It is desirable to be configured so that stage control is possible.

Instead of such an intake fan 27 or in addition to the intake fan, a push-in fan may be disposed on either the front or back side of the filter 24 on the outside air introduction means side, for example. In this case, the heat-exchanged air can be directly supplied to the upper air chamber 4 in the attic via the air supply duct 9, but a damper 10 for switching the air supply direction is provided on the upper side of the intake fan 27. The air can be supplied toward the upper air chamber 4 as indicated by an arrow A, or can be selectively supplied toward the lower air chamber 5 as indicated by an arrow B. By adopting such a configuration, the air heat-exchanged by the heat exchanger 20 can be selectively sent to the upper air chamber 4 or the lower air chamber 5. With respect to heat demand according to various conditions according to the number of people in the room, the amount of work, etc., flexible operation in terms of room temperature adjustment becomes possible. A dew condensation water removing device 30 is added below the right discharge side header 21B.

FIG. 2 shows an embodiment of the heat exchanger 20 shown in FIG. 1, which is configured as a so-called multi-tubular flat heat exchanger. In FIG. 2A, a large number of stainless thin tube groups 22 are welded between the opposite bottoms of the intake side header 21A and the discharge side header 21B, both of which are formed in an isosceles triangle shape. It is a top view which shows the state which exists. In this embodiment, 25 stainless steel tubes having an outer diameter of 25 mm, a wall thickness of 1 mm, and a length of 1.8 m are used as the stainless steel tube group 22. These numerical values are merely examples, and can be appropriately selected in consideration of various conditions of the use environment such as the size and direction of the building, the number of residents, the sunshine condition, and the like. The multi-tubular flat heat exchanger 20 is adopted in this way by dividing the flowing air into the individual stainless steel tubes and further increasing the contact area between the surface of each stainless steel tube and the soil as much as possible. The aim is to improve the heat exchange efficiency of the entire group 22 as much as possible. In addition, when the heat exchanger provided with the above-mentioned size and the number of the stainless thin tube groups 22 is buried in the ground of about 5 meters underground and the outside air of about 33 to 35 ° C. is passed through in the summer, it is usually from the discharge side. It was confirmed that air having a sufficient air conditioning temperature of about 27 ° C. or less was obtained.

2B is a side view corresponding to FIG. 2A. The left side is connected to the intake pipe 25 via the elbow 28 and the right side is connected to the exhaust vent pipe 26 via the elbow 29. FIG. The dew condensation water removing device 30 disposed below the header 21B on the discharge vent pipe 26 side removes the dew condensation water in the heat exchanger 20. The high-temperature air introduced from the outside is dehumidified while passing through the stainless thin tube group 22 and is cooled, and inevitably dew condensation occurs in the tubes and the condensed water stays therein. Therefore, when laying the heat exchanger 20, the air introduction side of the header 21 </ b> A in FIG. 1 is set to be, for example, about 4 to 5 cm higher than the air discharge side of the header 21 </ b> B so that the flow of condensed water is not hindered. There is a need. Condensation water can be removed as appropriate depending on the geology of the installation site, groundwater level, surrounding environment, and the like. For example, in the case of dry geology with good drainage, such as a gravel layer, it is sufficient to form a sand layer in an appropriate range corresponding to the periphery of the dew condensation water removing device 30 prior to embedding the heat exchanger 20. On the other hand, in areas with high groundwater levels, poor geology of drainage, areas where groundwater levels may rise suddenly during heavy rains such as torrential rains and typhoons, and wetlands close to rivers and lakes Therefore, it is necessary to consider the installation of forced drainage means such as a pump to remove condensed water if necessary.

2C is a cross-sectional view taken along the line X-X ′ in FIG. 2A showing the arrangement of the stainless thin tube groups 22 in the heat exchanger 20. In the present embodiment, a stainless thin tube group 22 is formed in which 23 stainless thin tubes are arranged in two staggered upper and lower stages. Although the heat exchange function may be one-stage, there is a possibility of being subjected to unequal earth pressure for a long time after embedding, so the staggered two-stage structure shown in the figure is easy to form with high strength. preferable. Furthermore, it is desirable to take care to alleviate stress applied to the deformation of the stainless thin tubes and the welded portion by adding a protective frame surrounding the periphery of the heat exchanger 20 except for the stainless thin tube group 22.

FIG. 3 shows an example of the structure of a ventilation skirting board which is a blowing part of conditioned air used in a building air conditioning system using geothermal heat according to the present invention, and corresponds to 8A and 8B in FIG. In this embodiment, a through hole 12 having a diameter d [mm] as shown in FIG. 3 (A) is formed at an opening interval l (lower case el) [mm] at the center portion of a long and narrow plywood material 11 having a width of 6 cm and a thickness of about 4 mm. ] Is provided. In this case, the diameter d and the interval l of the through-holes 12 have a great influence on the adjustment of the blowout amount of air subjected to air conditioning, the temperature to the room, and the humidity. Therefore, it is changed as appropriate depending on the composition of the air-conditioning space, for example, the first or second floor, the south face with strong sunshine or other directions, the living room with high opening / closing frequency, or the study / study room with low opening / closing frequency. can do.

Alternatively, they may be arranged in a staggered two-stage as shown in FIG. In the present embodiment, a ventilation skirting board provided with an opening arranged at the joint between the floor and the wall is assumed as the conditioned air blowing processing material, but the processing material is not limited to the skirting board, for example, , Vertically arranged along the junction between the pillar and the wall, arranged along the junction between the long press and the wall at a high part of the room, and high in the room along the junction between the peripheral edge and the wall It is also possible to arrange them horizontally on the parts.

As shown in the embodiment, the building air conditioning system using geothermal heat according to the present invention embeds a heat exchanger appropriately in the ground, and lowers the introduced outside air to a temperature close to the soil temperature in the ground. Alternatively, the temperature is raised and the dehumidified air is guided into the building so as to perform indoor air conditioning. Since the cooling and heating sources in ordinary air-conditioning equipment are no longer necessary, not only energy is saved, but also the use of electricity and the use of gaseous fuel and liquid fuel can be saved, so carbon dioxide emissions are also reduced. Because it is greatly reduced, it can provide a building air conditioning system that is also effective in suppressing global warming.

It is basic composition explanatory drawing of the building air-conditioning system by the geothermal utilization which concerns on this invention. It is the top view (A) which shows the structure of the heat exchanger which concerns on this invention, a side view (B), and X-X 'arrow sectional drawing (C) of FIG. It is an example of composition of a ventilation skirting board as an air-conditioning air discharge part concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Building 2 Outer wall 3 Inner wall 4 Upper (attic) air chamber 5 Lower (under the floor) air chamber 6 Air supply (down) duct 7 Circulation fan 8 Air-conditioning air discharge | release part 8A, 8B Ventilation baseboard 9 Air supply (up) duct 10 Damper 11 Plywood (baseboard)
12 Through-hole 20 Heat exchanger 21A, 21B Header 22 Stainless steel thin tube group 23 Outside air intake 24 Filter 25 Intake pipe 26 Exhaust vent pipe 27 Intake fan 28, 29 Elbow 30 Condensation water removing device

Claims (9)

  A multi-tubular flat heat exchanger connected between the intake side header and the exhaust side header so as to be in an airtight state by a plurality of metal thin tubes, and is embedded in the ground at a required depth Multi-pipe flat heat exchanger, intake pipe for introducing air to be conditioned into the intake-side header of the multi-pipe flat heat exchanger, and discharge-side header of the flat heat exchanger An air vent that communicates with the air-conditioning space from the outlet of the air outlet, and that is disposed along the corners of the indoor structural material through an appropriate space from the outlet side of the exhaust air vent tube, and an air outlet. A building air conditioning system using geothermal heat, characterized by comprising an air discharge part.   The main part of the multi-tubular flat heat exchanger is a group of stainless thin tubes in which 20 to 30 metal thin tubes that connect the intake side and the discharge side header in an airtight state are joined in a two-stage staggered arrangement. 2. The building air-conditioning system using geothermal heat according to claim 1, wherein the building air-conditioning system is used.   The building air-conditioning system using geothermal heat according to claim 1, wherein a plurality of the multi-tubular flat heat exchangers are disposed at appropriate intervals.   The multi-tubular flat heat exchanger installed at a plurality of appropriate intervals can be selected in any combination of alternate operation or parallel simultaneous operation by operating switching means according to heat demand. The building air conditioning system using geothermal heat according to claim 3.   The path for introducing the air temperature-adjusted by the multi-tubular flat heat exchanger into the air-conditioned space can be switched to a path that does not inhibit the temperature adjustment effect according to the heating period or the cooling period. A building air conditioning system using geothermal heat according to any one of claims 1 to 4.   The geothermal heat according to any one of claims 1 to 5, wherein the conditioned air discharge part is a ventilation skirting board that is horizontally disposed at a joint between a floor and a wall and has a large number of ventilation holes. Building air conditioning system by use.   6. The conditioned air discharge part is a processed product in which a large number of ventilation holes are formed in a material that is disposed substantially vertically along a junction between a column and a wall. Building air conditioning system using geothermal heat as described in 1.   6. The conditioned air discharge part is a processed product in which a large number of ventilation holes are formed in a material that is horizontally disposed along a joint between a long press and a wall. Building air conditioning system using geothermal heat as described.   6. The conditioned air discharge portion is a processed product in which a large number of ventilation holes are formed in a material that is horizontally disposed along a joint portion between a peripheral edge and a wall. Building air conditioning system using geothermal heat as described.

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