JP2009275931A - Air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning system suitable for a building having a large-scaled space such as a factory building. <P>SOLUTION: In this air conditioning system conditioning the air inside of a building by introducing the outside air through a geothermal utilization tube 10 buried in the ground E, a supply duct 12 is connected to the geothermal utilization tube 10, a supply opening 12 of the supply duct 12 is opened to a lower region inside of the building, and the air is released from the supply opening 12a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an air conditioning system using geothermal heat, and particularly to an air conditioning system suitable for cooling a building having a large-scale space such as a factory building.

  An example of an air conditioning system that uses geothermal energy to save energy is described in Patent Document 1. In this air conditioning system, the air introduced from the underfloor space is supplied to a geothermal utilization tube buried in the ground, and then discharged to the attic space.

  According to this air conditioning system, heat is exchanged between the air introduced from the underfloor space and the underground in the geothermal utilization tube. Here, since the underground temperature is lower than the outside air temperature in the summer, the temperature of the outside air introduced into the geothermal utilization tube is lowered, and the indoor temperature can be lowered.

Japanese Patent Publication No. 63-67109

  By the way, in the air-conditioning system of patent document 1, in order to guide the air discharged | emitted to the attic space under the floor, it is necessary to comprise space in the wall of a building. For this reason, when the temperature of a building having a large-scale space such as a factory building is adjusted, the introduction cost is remarkably increased. And the air conditioning system of patent document 1 makes temperature control object the whole building. Therefore, it is not suitable for air conditioning of a building having a large-scale space such as a factory building, and it may be difficult to adjust the room to a desired cooling temperature.

  In view of the above circumstances, an object of the present invention is to provide an air conditioning system suitable for a building having a large-scale space such as a factory building.

  In order to achieve the above object, an air conditioning system according to claim 1 of the present invention is an air conditioning system that performs air conditioning inside a building by introducing outside air through a geothermal utilization tube embedded in the ground, A blowout duct is connected to the geothermal utilization tube, and a blowout opening of the blowout duct is opened in a lower area inside the building, and air is discharged from the blowout opening.

  The air conditioning system according to claim 2 of the present invention is the distribution system according to claim 1, wherein the geothermal utilization tubes are arranged in a manner along the floor surface of the building, and a plurality of blowing ducts are connected. A tube portion, and a heat exchange tube portion that has one end portion connected to the outside air introduction duct and the other end portion connected to the distribution tube portion, and supplies outside air introduced from the outside air introduction duct to the distribution tube portion. It is characterized by having.

  The air conditioning system according to claim 3 of the present invention is characterized in that in claim 2 described above, an auxiliary heat exchanger is interposed between the heat exchange tube portion and the distribution tube portion.

  According to the present invention, since the blowout opening of the blowout duct is opened to the lower area inside the building, only the lower layer portion where many people are present inside the building having a large-scale space such as a factory building. Can be efficiently cooled.

  Exemplary embodiments of an air conditioning system according to the present invention will be described below in detail with reference to the accompanying drawings.

(Embodiment 1)
1 to 3 show an air conditioning system according to Embodiment 1 of the present invention. The air conditioning system exemplified here applies to a factory building (building) having a width W of about 110 m, a depth D of about 140 m, and a height H of about 10 m, and adjusts the temperature of the room surrounded by the outer wall 1. Is. Although not explicitly shown in the figure, this factory building has no room for partitioning in the room, and the room is configured as a single large-scale space. A plurality of pillars 2 are provided at equal intervals in the factory building. In the factory building to which the first embodiment is applied, a total of 60 pillars 2 are provided so as to have an interval of about 22 m in the width W direction and an interval of about 12 m in the depth D direction.

  In the underground E, a geothermal utilization tube 10 is embedded in a region which is a lower region of the floor F of the factory building. The geothermal utilization tube 10 is formed in a cylindrical shape by a synthetic resin material having a high thermal conductivity such as polyethylene, and is arranged substantially horizontally in the ground E in a mode along the floor surface F of the factory building. In the first embodiment, five polyethylene geothermal heat utilization tubes 10 having a diameter of 800 mm are prepared, and as shown in FIG. 3, these five geothermal heat utilization tubes 10 are respectively dug down 1500 mm from the ground surface E1, It is embed | buried along the depth direction between the columns 2 of the pillar 2 arranged in parallel along the depth direction of a factory building.

  As shown in FIG. 1, an introduction duct connecting portion 10 a that is curved upward is formed in a portion of each geothermal utilization tube 10 that extends outside the lower area of the floor F of the factory building.

  An external air introduction duct 11 and a plurality of blowing ducts 12 are attached to each geothermal utilization tube 10. The outside air introduction duct 11 is connected to the introduction duct connection portion 10a of the geothermal utilization tube 10 through the base end portion, extends vertically upward from the introduction duct connection portion 10a, and the distal end portion extends from the ground surface E1. It is exposed and opened outdoors. In the first embodiment, as shown in FIG. 1, an outside air introduction duct 11 whose tip is curved substantially at a right angle in the horizontal direction is applied. As a site | part which arrange | positions the external air introduction duct 11, it is preferable that it is the north side which is behind a factory building and does not receive sunlight.

  Each outside air introduction duct 11 is provided with a blower fan 13. The blower fan 13 introduces outside air into the outside air introduction duct 11 when driven. In this Embodiment 1, the ventilation fan 13 from which the flow velocity of the air which passes the inside of the geothermal utilization tube 10 will be about 2 m / s is applied.

  As shown in FIG. 2, the blowout duct 12 alternately extends in the horizontal direction from the circumferential surfaces on both sides of the geothermal utilization tube 10 and then curves in the vertical direction. It is exposed from the surface F and opens into the room of the factory building. The position where the air outlet 12a of the air outlet duct 12 is exposed from the floor surface F to the room is a part close to the pillar 2 around each pillar 2 so as not to hinder indoor work and layout of various machines. It is preferable. In the first embodiment, a polyethylene blowing duct 12 having a diameter of 300 mm is applied. The amount of protrusion of the blowing duct 12 from the floor surface F is set to about 100 mm so that foreign matter does not easily enter.

  In the air conditioning system configured as described above, when the blower fan 13 of the outside air introduction duct 11 is driven, outside air is introduced into the geothermal utilization tube 10 through the outside air introduction duct 11 and is sequentially sent downstream, and each blowout The air is discharged from the outlet 12a of the duct 12 into the room of the factory building.

  Here, in the spring, summer and autumn, the temperature of the underground E tends to be lower than the outside air temperature. Therefore, the relatively high temperature outside air introduced into the outside air introduction duct 11 exchanges heat with the earth and sand in the underground E while passing through the inside of the geothermal utilization tube 10, and the temperature is higher than that of outdoor air. Will decrease by about 4 ° C. As a result, if only the blower fan 13 of each outside air introduction duct 11 is driven, air having a temperature lower by about 4 ° C. than the outside air can be supplied into the room of the factory building. As a result, it is possible to cool the factory building without incurring an increase in running cost or an increase in the amount of discharged carbon dioxide compared to installing a cooling device.

  Moreover, as described above, the outlet 12a of the outlet duct 12 is set at a position of only 100 mm from the floor F of the factory building, and the flow velocity of the air passing through the geothermal utilization tube 10 is about 2 m / s. Therefore, the released air becomes gentle. Therefore, most of the air discharged from the outlet 12a of the outlet duct 12 is supplied only to the lower layer in the room of the factory building and does not reach the upper layer. That is, in the air conditioning system described above, only the lower layer portion is cooled in a room that is a large-scale space of a factory building. In such an air conditioning system, the upper part of the room remains in a high temperature state, but it is the lower part of the room that has many people, and as a result, the room that becomes a large-scale space can be efficiently cooled. . From these points, it is possible to reduce the running cost and the amount of discharged carbon dioxide.

  In winter, the temperature of the underground E tends to be higher than the outside air temperature. Accordingly, the relatively low temperature outside air introduced into the outside air introduction duct 11 exchanges heat with the earth and sand in the ground E while passing through the inside of the geothermal utilization tube 10, and the temperature is higher than that of outdoor air. Will rise by about 4 ° C. As a result, if the blower fan 13 of each outside air introduction duct 11 is driven, air having a temperature higher by about 4 ° C. than outside air can be supplied into the room of the factory building. Therefore, by installing this air conditioning system and a separate heater, the factory building can be heated without incurring an increase in running costs or an increase in the amount of carbon dioxide emitted compared to installing only a heater. It becomes possible to do. However, in this case, the relatively high temperature air discharged from the outlet 12a reaches the upper layer portion of the room. Therefore, it is preferable to install a blower for supplying the air of the upper layer part to the lower layer part in the upper part of the room.

(Embodiment 2)
4 to 6 show an air conditioning system according to Embodiment 2 of the present invention. As in the first embodiment, the air conditioning system exemplified here is a room that is applied to a factory building (building) in which there is no partition wall in the room and the room is configured as a single large-scale space. The temperature adjustment of the geothermal heat utilization tube is different from that of the first embodiment. That is, in Embodiment 2, the geothermal heat utilization tube 20 having the distribution tube portion 21 and the heat exchange tube portion 22 is applied.

  The distribution tube portion 21 is embedded in the underground E in a region below the floor F of the factory building, and is formed into a cylindrical shape with a synthetic resin material having high thermal conductivity such as polyethylene. In the second embodiment, six distribution tube parts 21 made of polyethylene having a diameter of 800 mm are prepared, and as shown in FIG. 6, each of the six distribution tube parts 21 is digged 1500 mm from the ground surface E1, respectively. It is arranged substantially horizontally in the ground E in a manner along the floor surface F. Each distribution tube part 21 is embed | buried along the depth direction in the aspect which adjoins to the row | line | column of the pillar 2 arranged in parallel along the depth direction of a factory building, respectively.

  A plurality of blow-out ducts 23 are connected to the individual distribution tube portions 21 on the peripheral surface close to the column 2 column. As shown in FIGS. 4 to 6, the blow-out duct 23 extends from the peripheral surface of the distribution tube portion 21 in the horizontal direction and then curves vertically upward. It is exposed from the surface F and opens into the room of the factory building. The position where the air outlet 23a of the air outlet duct 23 is exposed to the room from the floor surface F is a part close to the pillar 2 around each pillar 2 so as not to hinder indoor work and layout of various machines. It is preferable. As the blow-out duct 23, a polyethylene made of Φ300 mm is applied also in the second embodiment, and the protruding amount from the floor surface F is also set to about 100 mm.

  The heat exchange tube portions 22 are provided corresponding to the respective distribution tube portions 21, and are embedded in the ground E in a manner parallel to the distribution tube portions 21. In the second embodiment, a cylindrical cylindrical member made of polyethylene having a length of Φ800 mm and a length of about 60 m is applied as the heat exchange tube portion 22. These heat exchange tube portions 22 are arranged substantially horizontally in the ground E in a manner along the floor surface F of the factory building at a position dug down 1500 mm from the ground surface E1. As shown in FIG. 4, the portion of the heat exchange tube portion 22 that is disposed in the lower region of the floor F of the factory building is connected to the intermediate portion of the distribution tube portion 21 via the connection tube 24.

  On the other hand, an outside air introduction duct 25 is connected to an introduction duct connection portion 22a that is curved upwardly at a portion of each heat exchange tube portion 22 that is disposed outside the lower region of the floor F of the factory building. The outside air introduction duct 25 is connected to the introduction duct connection part 22a of the heat exchange tube part 22 through the base end part, extends vertically upward from the introduction duct connection part 22a, and the tip part is the ground surface E1. It is exposed from and opened outdoors. In the second embodiment, as shown in FIG. 4, an outside air introduction duct 25 having a distal end curved in a substantially right angle toward the horizontal direction is applied. The part where the outside air introduction duct 25 is arranged is preferably on the north side where the sun is behind the factory building and is not exposed to the sun.

  Each outside air introduction duct 25 is provided with a blower fan 26. The blower fan 26 introduces outside air into the outside air introduction duct 25 when driven. In the second embodiment, the blower fan 26 in which the flow rate of the air passing through the heat exchange tube portion 22 is about 2 m / s is applied. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed descriptions thereof are omitted.

  In the air conditioning system configured as described above, when the blower fan 26 of the outside air introduction duct 25 is driven, outside air is introduced into the heat exchange tube portion 22 through the outside air introduction duct 25, and then the connection tube 24 and the distribution tube portion 21 are connected. It is sequentially fed downstream and discharged from the outlet 23a of each outlet duct 23 into the room of the factory building.

  Here, in the spring, summer and autumn, the temperature of the underground E tends to be lower than the outside air temperature. Therefore, the relatively high temperature outside air introduced into the outside air introduction duct 25 is heated between the heat exchanging tube portion 22, the connecting tube 24 portion and the distribution tube portion 21 with the earth and sand in the ground E. The temperature is reduced by about 4 ° C. compared to outdoor air. As a result, if only the blower fan 26 of each outside air introduction duct 25 is driven, air having a temperature lower by about 4 ° C. than outside air can be supplied into the room of the factory building. As a result, it is possible to cool the factory building without incurring an increase in running cost or an increase in the amount of discharged carbon dioxide compared to installing a cooling device.

  Moreover, as described above, the outlet 23a of the outlet duct 23 is set at a position of only 100 mm from the floor F of the factory building, and the flow velocity of air passing through the heat exchange tube portion 22 is about 2 m / s. Because of the degree, the released air becomes gentle. Therefore, most of the air discharged from the outlet 23a of the outlet duct 23 is supplied only to the lower layer portion in the room of the factory building, and does not reach the upper layer portion. That is, in the air conditioning system described above, only the lower layer portion is cooled in a room that is a large-scale space of a factory building. In such an air conditioning system, the upper part of the room remains in a high temperature state, but it is the lower part of the room that has many people, and as a result, the room that becomes a large-scale space can be efficiently cooled. . From these points, it is possible to reduce the running cost and the amount of discharged carbon dioxide.

  Further, in the above-described air conditioning system, the heat exchange tube portion 22 and the distribution tube portion 21 are divided as the geothermal utilization tube 20, and the length of the heat exchange tube portion 22 on the upstream side is not provided without providing the blowing duct 23. To ensure enough. Therefore, the air passing through the heat exchange tube portion 22 is efficiently and sufficiently heat-exchanged, and the above-described effects become more remarkable.

  In winter, the temperature of the underground E tends to be higher than the outside air temperature. Therefore, the relatively low temperature outside air introduced into the outside air introduction duct 25 is heated between the heat exchanging tube portion 22, the connecting tube 24 portion and the distribution tube portion 21 with the earth and sand in the ground E. It will be replaced and the temperature will rise by about 4 ° C compared to outdoor air. As a result, if the blower fan 26 of each outside air introduction duct 25 is driven, air having a temperature about 4 ° C. higher than the outside air can be supplied into the room of the factory building. Therefore, by using this air conditioning system in combination with a separately installed heater, the factory building can be heated without incurring an increase in running costs or an increase in the amount of emitted carbon dioxide compared to the case where only the heater is installed. It becomes possible to do.

(Embodiment 3)
7 and 8 show an air conditioning system according to Embodiment 3 of the present invention. The air conditioning system illustrated here is different from the second embodiment only in the configuration of the connection tube 34 that connects between the heat exchange tube portion 22 and the distribution tube portion 21 of the geothermal utilization tube 20.

  That is, the connection tube 34 of the third embodiment extends upward from the end of the heat exchange tube portion 22 and then extends downward after passing under the roof at the top of the factory building. It is connected to the middle part of the distribution tube part 21 and includes an auxiliary heat exchanger 35 in a part passing through the ceiling.

  The auxiliary heat exchanger 35 takes in relatively high temperature air staying in the upper layer portion of the room as the return air when the return port 35a is opened, and mixes the return air with the air passing through the connection tube 34. It has a function to increase the temperature. The auxiliary heat exchanger 35 includes heating means such as a hot water heater (not shown) inside, and has a function of heating the air passing through the connection tube 34. In the third embodiment, the same components as those in the second embodiment are denoted by the same reference numerals, and detailed descriptions thereof are omitted.

  In the air conditioning system configured as described above, when the blower fan 26 of the outside air introduction duct 25 is driven, outside air is introduced into the heat exchange tube portion 22 through the outside air introduction duct 25, and then the connection tube 34 and the distribution tube portion 21 are connected. It is sequentially fed downstream and discharged from the outlet 23a of each outlet duct 23 into the room of the factory building.

  Here, in the spring, summer and autumn, the temperature of the underground E tends to be lower than the outside air temperature. Therefore, if the auxiliary heat exchanger 35 interposed in the connection tube 34 is stopped, the relatively high temperature outside air introduced into the outside air introduction duct 25 passes through the heat exchange tube portion 22 and the distribution tube portion 21. During the passage, heat exchange is performed with the earth and sand in the ground E, and the temperature is reduced by about 4 ° C. compared to outdoor air. As a result, if only the blower fan 26 of each outside air introduction duct 25 is driven, air having a temperature lower by about 4 ° C. than outside air can be supplied into the room of the factory building. As a result, it is possible to cool the factory building without incurring an increase in running cost or an increase in the amount of carbon dioxide discharged.

  Moreover, as described above, the outlet 23a of the outlet duct 23 is set at a position of only 100 mm from the floor F of the factory building, and the flow velocity of air passing through the heat exchange tube portion 22 is about 2 m / s. Because of the degree, the released air becomes gentle. Therefore, most of the air discharged from the outlet 23a of the outlet duct 23 is supplied only to the lower layer portion in the room of the factory building, and does not reach the upper layer portion. That is, in the air conditioning system described above, only the lower layer portion is cooled in a room that is a large-scale space of a factory building. In such an air conditioning system, the upper part of the room remains in a high temperature state, but it is the lower part of the room that has many people, and as a result, the room that becomes a large-scale space can be efficiently cooled. . From these points, it is possible to reduce the running cost and the amount of discharged carbon dioxide.

  Further, in the above-described air conditioning system, the heat exchange tube portion 22 and the distribution tube portion 21 are divided as the geothermal utilization tube 20, and the length of the heat exchange tube portion 22 on the upstream side is not provided without providing the blowing duct 23. To ensure enough. Therefore, the air passing through the heat exchange tube portion 22 is efficiently and sufficiently heat-exchanged, and the above-described effects become more remarkable.

  In winter, the temperature of the underground E tends to be higher than the outside air temperature. Accordingly, the relatively low temperature outside air introduced into the outside air introduction duct 25 exchanges heat with the earth and sand in the ground E while passing through the inside of the heat exchange tube portion 22 and the distribution tube portion 21, and the outdoors. The temperature rises by about 4 ° C. compared to the air. And in winter, it becomes possible to further raise the temperature of the air which passes the connection tube 34 by driving the auxiliary heat exchanger 35 mentioned above, and it becomes possible to fully heat the room of a factory building. . In this case, air heated by geothermal heat or relatively hot air staying in the upper layer portion of the room is introduced into the auxiliary heat exchanger 35, so that the auxiliary heat exchanger 35 is compared with the case where the outside air is directly introduced. The heat exchange efficiency can be improved. This makes it possible to heat the factory building without incurring an increase in running costs or an increase in the amount of carbon dioxide that is emitted.

  The auxiliary heat exchanger 35 described above does not necessarily need to be driven only during indoor heating, and may be driven during cooling as long as it has a cooler. However, the return port 35a for introducing return air needs to be kept closed. Even during the cooling, since the air cooled by the geothermal heat is introduced into the auxiliary heat exchanger 35, it is possible to improve the heat exchange efficiency as compared with the case where the outside air is directly introduced.

  When the auxiliary heat exchanger 35 is provided with a blower fan that supplies air after heat exchange to the distribution tube portion 21, the blower fan 26 of the outside air introduction duct 25 may be omitted. .

(Embodiment 4)
FIG. 9 shows an air conditioning system according to Embodiment 4 of the present invention. The air conditioning system illustrated here differs from the third embodiment only in the configuration of the connection tube 44 that connects between the heat exchange tube portion 22 and the distribution tube portion 21 of the geothermal utilization tube 20.

  That is, the connection tube 44 of the fourth embodiment extends upward from the end portion of the heat exchange tube portion 22, and extends downward after passing through the roof under the factory building. The first connection tube portion 44a connected to the distribution tube portion 21 and the second connection tube portion 44b for directly connecting the heat exchange tube portion 22 and the distribution tube portion 21 in the underground E are configured. is there.

  The first connection tube portion 44a and the second connection tube portion 44b are provided with first partition means 45a and second partition means 45b for opening and closing each.

  In the air conditioning system configured as described above, if the first connection tube portion 44a is opened by the first partition means 45a while the second connection tube portion 44b is closed by the second partition means 45b, the heat exchange tube portion 22 is provided. Since the auxiliary heat exchanger 35 is interposed between the distribution tube portion 21 and the distribution tube portion 21, it is possible to perform the same operation as that of the third embodiment (path indicated by a broken line in FIG. 9).

  On the other hand, if the first connecting tube portion 44a is closed by the first partitioning means 45a, and the second connecting tube portion 44b is opened by the second partitioning means 45b, the space between the heat exchange tube portion 22 and the distribution tube portion 21 is reduced. It is directly connected, and the same operation as that of the second embodiment can be performed (route shown by a solid line in FIG. 9).

  In Embodiments 1 to 4 described above, the outlet of the outlet duct is made to protrude by 100 mm from the floor surface. However, the present invention is not limited to this, and is located in the lower area in the room of the factory building. What is necessary is just to make it open. As described above, the lower area in the room where the air outlet is opened is the height at which the air discharged from the air outlet is supplied only to the lower layer in the room where there are many people. Therefore, for example, as shown in the modification of FIG. 10, after extending in the horizontal direction from the geothermal utilization tube 120, it is curved upward and the outlet 23 a is provided at a height of about 2 m from the floor F. However, the same effect can be obtained. In the example shown in FIG. 10, two blowout ports 123 a are provided at the upper end portion of the blowout duct 123. The member constituting the blowout port 123a is, for example, configured in a bellows shape, and is preferably configured so that the direction can be appropriately changed. Even in this case, it is preferable that the portion provided with the outlet 123 a is in the vicinity of the column 2.

  Moreover, in Embodiment 1-4 mentioned above, although all have illustrated the air-conditioning system which applied factory factory as application object, it is possible to apply similarly to another building.

  Furthermore, the specific numerical values described in the first to fourth embodiments are for illustrative purposes and do not limit the present invention. For example, in the second to third embodiments, the diameter of the distribution tube portion 21 and the diameter of the heat exchange tube portion 22 are the same, but it is not always necessary to have the same diameter, and the room is in accordance with the scale of the building. What is necessary is just to set suitably according to conditions, such as an air quantity supplied to a heat exchanger and heat exchange efficiency.

It is a conceptual diagram which shows the principal part of the air conditioning system which is Embodiment 1 of this invention. It is sectional drawing which shows the principal part of the air conditioning system shown in FIG. It is a top view which shows the layout of the air conditioning system shown in FIG. It is a conceptual diagram which shows the principal part of the air conditioning system which is Embodiment 2 of this invention. It is sectional drawing which shows the principal part of the air conditioning system shown in FIG. It is a top view which shows the layout of the air conditioning system shown in FIG. It is a conceptual diagram which shows the principal part of the air conditioning system which is Embodiment 3 of this invention. It is sectional drawing which shows the principal part of the air conditioning system shown in FIG. It is a conceptual diagram which shows the principal part of the air conditioning system which is Embodiment 4 of this invention. It is principal part sectional drawing which shows the modification of this invention.

Explanation of symbols

2 pillar 10 geothermal use tube 10a introduction duct connection portion 11 outside air introduction duct 12 blowout duct 12a blowout port 13 blower fan 20 geothermal use tube 21 distribution tube portion 22 heat exchange tube portion 22a introduction duct connection portion 23 blowout duct 23a blowout port 24 connection Tube 25 Outside air introduction duct 26 Blower fan 34 Connection tube 35 Auxiliary heat exchanger 35a Return port 44 Connection tube 44a First connection tube portion 44b Second connection tube portion 45a First partition means 45b Second partition means 120 Geothermal utilization tube 123 Duct 123a Outlet E Underground F Floor

Claims (3)

An air conditioning system that air-conditions the interior of a building by introducing outside air through a geothermal tube embedded in the ground,
An air conditioning system characterized in that a blowout duct is connected to the geothermal utilization tube, a blowout opening of the blowout duct is opened in a lower area inside the building, and air is discharged from the blowout opening. The geothermal utilization tube is
A distribution tube portion arranged in a manner along the floor of the building, and connected to a plurality of blowing ducts;
A heat exchange tube portion having one end connected to the outside air introduction duct and the other end connected to the distribution tube portion, and supplying outside air introduced from the outside air introduction duct to the distribution tube portion. The air conditioning system according to claim 1, wherein   The air conditioning system according to claim 2, wherein an auxiliary heat exchanger is interposed between the heat exchange tube portion and the distribution tube portion.

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