JP6464482B2 - Air conditioning system - Google Patents

Description

  The present invention relates to an indoor air conditioning system.

  In indoor cooling by a general central air-conditioning system, air that has been cooled and adjusted in temperature by an air conditioner installed in a machine room or the like is transported to a living room space and sent out from a blow-out port to the room. Air conveyance power is said to account for 10% to 18% of energy consumption by use of office buildings, and reduction of energy consumption is expected to protect the global environment and reduce power costs.

  In addition, when the conveyed air is blown into the room from the air outlet, unevenness in the room temperature tends to occur near and far from the air outlet. In the vicinity of the air outlet, the wind speed is high and a convection sensation is felt, which causes discomfort such as direct contact of cold air with the office worker, and if it is far from the air outlet, the cooling effect may not be sufficiently obtained. Further, even when an air conditioner integrated with a heating / cooling device called a package type and a fan is installed on a ceiling surface or the like, the influence of the position of the outlet is large, and it is difficult to obtain a uniform environment.

  On the other hand, in the ceiling radiation air conditioning system described in Patent Literature 1, a radiation panel and a cooling water pipe are provided on the ceiling to partition the space in the ceiling into the interior side and the perimeter side. When the perimeter side is under low load, cool water is supplied to the cooling pipe to cool the ceiling surface, and when the perimeter side is under high load, the air on the interior side is sent to the perimeter side by a blower so that air-conditioned air is blown into the room. I have to. As a result, the room load is processed to obtain a uniform environment with a small vertical temperature distribution.

Moreover, in the full-surface floor blowing type air conditioner described in Patent Document 2, an exhaust passage is provided in the upper part of the room, and the blow-out opening provided on the entire surface of the floor member partitioning the double floor and a part of the office room area, etc. And a spot blowing device capable of adjusting the amount of blowing air provided. Then, cold and warm air is supplied from the air conditioner to the double floor and blown out into the room through the outlet of the floor member and the spot outlet.
In addition, when the heat load is unevenly distributed in the room or when you want a personal air flow, you can adjust the air volume blown from the spot blower device and select the optimal air conditioning environment such as full-floor blowout or personal floor blowout I made it.

JP 2011-2105 A Japanese Patent No. 3275195

However, in the ceiling radiation type air conditioning system described in Patent Document 1 described above, comfort is obtained by the ceiling radiation air conditioning, but when the amount of heat becomes high due to, for example, the office worker moving from the outside to the inside, the radiation panel. It was not possible to sufficiently cool by the radiation effect. In addition, there is a problem that fresh outdoor air cannot be introduced into the room and comfort due to the flow of wind cannot be obtained.
Further, the full-floor blow-out air conditioning system described in Patent Document 2 supplies air-conditioned air for the air conditioner not only for ventilation but also for adjusting the indoor thermal environment. The conventional problem of large energy consumption has not been solved.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an air conditioning system that can control an indoor load by natural convection and requires only a small amount of air conveyance power.

An air conditioning system according to the present invention is provided in a ceiling space and cools air by natural convection, and the ceiling space and the living room are partitioned to supply air conditioned by the cooling device to the living room. A ceiling having ventilation holes, and an air conditioner for supplying outside air to the living room through an outlet of a floor member for supplying air into the double floor and partitioning the double floor and the living room, and the ceiling is made of metal The vent hole is formed in a circular shape, and an opening ratio that is the sum of the area of the vent hole with respect to the area of the ceiling is set to 6 to 22%, and the cooling device Includes a chilled water pipe for distributing load-adjustable chilled water, heat is exchanged between the chilled water and the air around the chilled water pipe in the ceiling space, and the cooled air is sent to the ceiling side. Move and cool the ceiling It is coolable constituting the room by thermal radiation at Rukoto, and, characterized in that it is configured to be cooled the room by natural convection through the vent holes.
According to the present invention, the air conditioned by the cooling device provided in the ceiling space can be treated by the natural convection through the ceiling vents to the room side to handle the load in the room, and the air conditioner such as an external air conditioner. The fresh air can be introduced into the living room through the blowout port of the floor member of the double floor by supplying the double floor with the air that has been treated with the outdoor air load. Therefore, there is no need for air conveyance for treating the indoor load with the air conditioner, and it is only necessary to convey the air for ventilation by the air conditioner into the room through the floor member of the double floor, so that it is possible to reduce the energy for conveying air. .
In that case, it is preferable to supply the outside air introduced into the living room from the outlet of the floor member without hindering the cooling air from dropping due to natural convection. The outside air supplied from the air conditioner to the double floor includes not only the air that has processed the outside air load but also the air that is introduced without adjustment.
In the cooling device, the load of the cooling air in the ceiling can be adjusted by the temperature of the cold water flowing through the cold water pipe. Also, by adjusting the humidity and temperature of the outside air introduced into the double floor with the air conditioner, the temperature of the cold water used in the chilled water piping of the cooling device can be adjusted, and the temperature of the cooling source such as a refrigerator or heat pump Increases efficiency.
In the air conditioning system according to the present invention, the cooling device includes a plurality of plate fins that are spaced apart from each other in the extending direction of the cold water pipe and in which through holes that penetrate in the extending direction are formed. The cold water pipe may be inserted into the through hole of the plate fin, and the plate fin may be arranged in a four-sided frame-shaped casing.

Moreover, it is preferable that the double-floor outlet is provided on the entire surface or / and part of the floor member.
When the floor member outlet is provided on the entire surface of the room, air can be uniformly blown from the entire surface of the floor member in the room, so that outside air can be uniformly introduced into the room, for example, a floor member When a blowout port is provided in a part of an area or the like, for example, it can be supplied from a floor member close to the office worker in the living room, so that comfort can be improved. Alternatively, when the air outlet is provided on the entire surface of the floor member and another air outlet is provided in a part of the office worker area or the like, the comfort can be further improved. In this case, another spot outlet may be provided with a spot balloon device capable of adjusting the volume of blown air.

The outside air supplied from the outlet to the living room may be controllable so as to have a wind speed that does not prevent the cooled air from descending due to natural convection from the ceiling .

According to the air conditioning system of the present invention, the air conditioned by the cooling device in the ceiling space is supplied to the living room through the ventilation holes of the ceiling panel by natural convection and can handle the indoor load. It is only necessary to introduce outside air through the machine, and it is possible to reduce the energy for conveying air.
In addition, the load of the cooling device can be reduced when the air that has been treated for the outside air load by the air conditioner is introduced into the living room through the double floor outlet.

It is a mimetic diagram showing an air-conditioning system by an embodiment of the present invention. (A) is a figure which shows the arrangement | sequence of the ceiling panel used in FIG. 1, (b) is a figure which shows a single ceiling panel. It is a principal part perspective view of the cooling device used in FIG. It is a typical figure showing the composition of the air-conditioning system by the modification of this embodiment. It is a schematic diagram which shows the structure of the laboratory by the air conditioning system by embodiment. It is a figure which shows the cooling device and temperature measurement point in the ceiling plan of the air conditioning system shown in FIG. It is a figure which shows the temperature distribution of the height direction in the air conditioning system in the laboratory shown in FIG. 5, (a) is a comparative example which does not introduce external air by an external air conditioner, (b) This is the case of the embodiment in which it was introduced.

Hereinafter, an air conditioning system according to an embodiment of the present invention will be described with reference to the accompanying drawings.
An air conditioning system according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a diagram showing an air conditioning system 1 according to an embodiment of the present invention. In a room 2, side portions formed between upper and lower slabs 3 and 4 of a building are partitioned by wall surfaces 5. FIG. In the lower part of the chamber 2, an underfloor space serving as a double floor 6 is installed between the lower slab 4 and the floor member 7, and the floor member 7 forming the double floor 6 is blown out at predetermined intervals over the entire surface. 7a is formed.

A ceiling 8 is installed in the upper part of the chamber 2, and an in-ceiling space 9 is formed between the ceiling 8 and the upper slab 3. A living room 10 partitioned by a wall surface 5 is formed between the ceiling 8 and the floor member 7.
As shown in FIG. 2 (a), a ceiling panel body 12 having a horizontal plane is disposed on the ceiling 8, and the ceiling panel body 12 is a ceiling formed in a thin panel shape as shown in FIG. 2 (b). A plurality of panels 13 are arranged side by side. In the present embodiment, the ceiling panel 13 has a rectangular plate shape made of metal such as aluminum. In addition, the ceiling panel 13 may be comprised from the asbestos sound-absorbing board.

As shown in FIG. 2B, the ceiling panel 13 is formed with a plurality of through holes 13 a that allow the space 9 in the ceiling and the living room 10 to communicate with each other. The through hole 13a is formed in a circular shape in FIG. 2B, but the shape is arbitrary. In addition, although the aperture ratio which is the sum total of the area of the several through-hole 13a with respect to the area of the ceiling panel 13 was set to 6 to 22%, you may remove | deviate from this range.
In the ceiling 8, slits may be formed at predetermined intervals instead of the through holes 13a. In this case, a plurality of slits may be formed in a parallel direction or a direction intersecting each other.

The air-conditioning system 1 according to the present embodiment is installed in the living room 10 and a temperature detecting unit 15 that measures the temperature in the living room 10, and cooling that is installed in the ceiling space 9 and adjusts the temperature in the living room 10. The apparatus 16 and the control part 17 which controls the temperature of the cooling device 16 based on the measured temperature of the temperature detection part 15 are provided.
As shown in FIG. 3, the cooling device 16 includes a housing 18 and a cold water pipe 19 formed by meandering through the side surface 18 a facing the housing 18. The cold water pipe 19 is meandered a plurality of times by projecting to the outside of the side surface 18 a of the housing 18 and curving in a substantially U shape. The chilled water pipe 19 is connected to a cooling source such as a refrigerator or a heat pump (not shown), and cools ambient air by circulating cold water having an appropriate temperature produced by the refrigerator or the heat pump.
The opening 18b communicating with each other on the upper and lower surfaces of the housing 18, 18c are formed, the openings 18b of the top and bottom, a plurality of plate fins 20 in 18c is arranged. The cold water pipe 19 is disposed through a plurality of arranged plate fins 20.

Further, the control unit 17 controls the cooling capacity of the cooling device 16 according to the detected temperature of the living room 10 detected by the temperature detecting unit 15. For example, the control unit 17 operates the cooling device 16 by comparing a preset initial set temperature with a detected temperature. That is, the temperature of the chilled water flowing through the cooling device 16 (hereinafter referred to as chilled water temperature) and the chilled water flow rate are adjusted according to the temperature difference between the detected temperature and the initial set temperature, and the temperature difference between the detected temperature and the initial set temperature is large. Accordingly, the temperature of the cold water is lowered to increase the cold water flow rate. Further, when the detected temperature is equal to or lower than the initial set temperature, the operation of the cooling device 16 is stopped.
In addition, it is preferable that the distance from the upper surface to the upper slab 3 and the distance from the lower surface to the ceiling 8 of the cooling device 16 installed in the ceiling space 9 are set to be equal. However, the installation position of the cooling device 16 may be set at an arbitrary height. Even in this case, it is preferable to provide a gap between the cooling device 16 and the slab 3 and between the cooling device 16 and the ceiling 8.

In addition, the air conditioning system 1 according to the present embodiment is provided with an external air conditioner 22 for introducing fresh outdoor air into the living room 10 separately from the cooling device 16. The external air conditioner 22 is installed outside the room 2 and includes an air supply pipe 23 that communicates with the double floor 6 and a return air pipe 24 that communicates with the living room 10 through, for example, a return air port 24 a installed on the ceiling 8. ing.
The outside air introduced by the external air conditioner 22 is subjected to an outside air load, temperature-adjusted and supplied to the double floor 6 as the supply air SA, and fresh air is introduced into the living room 10 through the outlet 7 a of the floor member 7. Then, the air in the living room 10 was sucked from the return air port 24a, returned to the external air conditioner 22 through the return air pipe 24, and discharged to the outside air.
Therefore, the air conditioning system 1 according to the present embodiment is configured by combining a ceiling cooling air conditioning system using the ceiling 8 in which the cooling device 16 and the through-holes 13a are arranged, and an entire floor blowing air conditioning system using the external air conditioner 22.

The air conditioning system 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.
In the air conditioning system 1, when the temperature in the living room 10 is higher than the initial set temperature, the cooling device 16 provided between the ceiling 8 and the upper slab 3 operates. Then, cold water flows through the cold water pipe 19 in the cooling device 16, and heat exchange is performed between the cold water flowing through the cold water pipe 19 and the air around the cold water pipe 19. The air around the chilled water pipe 19 that has been cooled and increased in density moves downward from the cooling device 16 in the ceiling space 9 through the opening 18c by natural convection.
And this cooling air oozes out into the living room 10 through the through-hole 13a formed in each ceiling panel 13 of the ceiling 8.

On the other hand, the air heated by the heat load caused by the heat generated by the workers in the living room 10 or the heat generated by the equipment moves upward, passes through the through holes 13a of the ceiling panel body 12, and enters the interior space 9 of the ceiling. To the inside of the housing 18 from the opening 18b of the cooling device 16 in the ceiling space 9. And this air is cooled by heat exchange with the cold water which distribute | circulates the inside of the cold water piping 19 as mentioned above. The air that has been cooled by the cold water pipe 19 and has a high density moves downward again and falls to the living room 10.
In this way, natural convection is generated in which the cooling air and the heated air circulate in the vertical direction in the ceiling space 9 and the living room 10.

By the way, in the air conditioning system 1, while the inside of the living room 10 is cooled by the cooling device 16, it is necessary to introduce fresh air into the office area etc. in the living room 10. Therefore, outside air is introduced into the external air conditioner 22. The outside air conditioner 22 processes the outside air load by reducing the outside air temperature to be equal to the temperature of the living room 10, for example, and supplies this air SA to the double floor 6 in the room 2 through the air supply pipe 23.
Then, fresh air SA is blown out into the living room 10 through a large number of outlets 7a formed on the entire surface of the floor member 7 of the double floor 6 at predetermined intervals. At this time, the flow of the air SA supplied into the living room 10 from the outlet 7a of the floor member 7 is externally adjusted so as to have a blowing air volume and a speed that do not prevent the cooling air from falling due to natural convection from the ceiling 8. Controlled by machine 22. Further, the air SA consumed in the living room 10 is heated and rises, and a part thereof is conveyed from the return air opening 24a provided in the ceiling 8 to the external air conditioner 22 through the return air piping 24 and discharged to the outside air. The

  As described above, the air conditioning system 1 according to the present embodiment is configured by combining the ceiling cooling air conditioning system using the cooling device 16 and the entire floor blowing air conditioning system using the external air conditioner 22. Therefore, unlike the general central convection air-conditioning system, there is no need for air conveyance for processing the load in the living room 10 by the air conditioner, and only the power for conveying the outside air SA by the external air conditioner 22 is installed. It is possible to reduce the conveyance power energy for conveying air.

In addition, when introduce | transducing outside air from the external air conditioner 22, the temperature of the fresh air SA supplied in the living room 10 can be reduced by controlling by reducing the humidity of outside air. In that case, since the temperature in the living room 10 can be lowered, the difference between the detected temperature and the initial set temperature becomes small, and the cold water flowing through the cold water pipe 19 of the cooling device 16 provided in the ceiling space 9 is relatively high. The driving efficiency of the refrigerator or heat pipe can be increased by setting the temperature.
For example, the temperature of cold water generated by a refrigerator is generally low-temperature cold water of about 7 ° C., but when the humidity is controlled by the external conditioner 22, it can be medium-temperature cold water of about 16 ° C., for example.

As described above, according to the air conditioning system 1 according to the present embodiment, the temperature load in the room 10 is controlled by natural convection, heat flow, and heat radiation generated due to a temperature difference between the ceiling space 9 and the room 10. For the air energy, fresh outside air for ventilation by the external air conditioner 22 may be used for introduction into the living room 10. Therefore, it is possible to reduce the air transport power energy as compared with the air conditioning system that handles both the room load and the outside air load in the conventional air conditioner.
In addition, there is an advantage that the cost can be reduced and the construction is easy as compared with a ceiling radiation type air conditioning system using a conventional radiation panel.

In addition, it is possible to achieve an appropriate natural convection of the air through the through hole 13a of the ceiling 8 to equalize the room temperature of the living room 10, and to obtain a radiant sensation for lowering the low-temperature air from the ceiling 8, thereby creating a comfortable thermal environment. Can be formed. Moreover, fresh outside air can be supplied from the outlet 7 a of the floor member 7 close to the office space in the living room 10.
Further, by adjusting the humidity of the outside air introduced by the external air conditioner 22, the temperature of fresh outside air supplied into the living room 10 can be lowered, so that the cold water supplied to the cold water pipe 19 of the cooling device 16 can be raised to an intermediate temperature. Therefore, energy saving can be achieved by increasing the efficiency of driving the heat source.

  In addition, the air conditioning system 1 by this invention is not limited to the above-mentioned embodiment, A various change, substitution, etc. are possible in the range which does not deviate from the summary. In the following, modifications of the present invention will be described using the same reference numerals for the same or similar parts and members as those of the above-described embodiment.

FIG. 4 is a schematic diagram showing an air conditioning system 1A according to the first modification of the embodiment described above.
This first modification is different from the above-described embodiment in that a personal floor blowing air-conditioning system is adopted as the floor blowing air-conditioning system instead of the full floor blowing air-conditioning system, and the remaining configuration is made common.
That is, in the air conditioning system 1 </ b> A according to this modification, the office space 28 for the office worker is installed on the floor member 7 in the living room 10, and the personal outlet 28 a is formed near the office space 28 in the floor member 7. In addition, personal blowing ports 28b are also formed at appropriate intervals other than the office space 28. The other structure is the same as that of the air conditioning system 1 by embodiment mentioned above.

  In the air conditioning system 1A according to the present modification, fresh outside air is supplied from the personal air outlet 28a and the other personal air outlets 28b in the office space 28, so that the office space 28 can be effectively air-conditioned. In particular, if the humidity is controlled by the external air conditioner 22, the temperature of fresh outside air supplied to the office space 28 can be lowered, the cooling efficiency is good, and a comfortable indoor environment can be realized.

Further, as a second modification of the present invention, the floor blowing air-conditioning system may be configured by combining the personal floor blowing air-conditioning system shown in the first modification described above in addition to the entire floor blowing air-conditioning system shown in the embodiment described above. Good.
According to the second modification, in the air conditioning system 1, the fresh air SA introduced by the external air conditioner 22 supplied from the floor member 7 of the double floor 6 into the living room 10 is provided on the entire surface of the floor member 7. In addition to being supplied from a large number of outlets 7a, a part of fresh air SA is also supplied from personal outlets 28a formed in the floor member 7 of the office space 28. Therefore, since fresh fresh air can be supplied to the entire living room 10 and fresh fresh air can be supplied to the office space 28, the efficiency of cooling and returning air is further increased.
In addition to the full-floor blowing air conditioning system, spot blowing devices capable of adjusting the blowing air volume installed by the above-described conventional technology may be installed as the personal blowing ports 28a and 28b to be installed.

Next, a cooling performance confirmation experiment performed in a laboratory in which the air conditioning system 1 according to the present embodiment is installed will be described with reference to FIGS.
FIG. 5 shows a schematic configuration diagram of an air conditioning system provided in a laboratory. The same configuration as the air conditioning system 1 according to the present embodiment will be described using the same reference numerals.
In the laboratory air conditioning system 1 shown in FIG. 5, a cooling device 16 is installed in a ceiling space 9 partitioned by a ceiling 8, and a ceiling panel body 12 in which ceiling panels 13 having through holes 13 a are arranged in the vertical and horizontal directions as the ceiling 8. Laid. Further, the double floor 6 partitioned by the floor member 7 was provided to partition the living room 10. In the living room 10, the heat generated by the assumed office worker, the heat generated by the installed devices, and the like were installed as a simulated load 30.

The laboratory is 5.4 m × 6.0 m (floor area 32.4 m ² ) in the vertical and horizontal directions, the height in the chamber 2 is 4150 mm, the height of the double floor 6 is 150 mm, the height of the living room 10 is 2800 mm, The height of the interior space 9 (ceiling pocket) partitioned by the ceiling 8 was set to 1200 mm.
Air conditioning system 1 of the laboratory is floor-balloon system by double bed 6, 6 m 3 ^/ air volume outlet 7a is assumed to require fresh air amount of the general office ^{(m 2 · h) × 32.4m} 2 ≈200 m ³ / h. The temperature in the living room 10 was 26 ° C., and the temperature at which the outside air SA was blown out from the double floor 6 was also 26 ° C. The simulated load 30 in the living room 10 was set to 60 W / m ^{2, which} is a heating element simulating the load (simulating human body heat and already developed heat) and the heating value of lighting, which is used as the maximum value during facility design. Chilled water at 16 ° C. was allowed to flow at a flow rate of 7 L / min through the chilled water pipe 19 of the cooling device 16 (load processing capacity: about 200 W / piece × 12 pieces) installed in the ceiling space 9. Moreover, the ceiling 8 used the through-hole 13a of the ceiling panel 13 whose opening diameter is 1.5 mmφ and whose opening ratio is 17.4%.

  FIG. 6 shows a ceiling plan view of the air conditioning system 1 in the laboratory. In the ceiling plan shown in FIG. 6, eight points a, b, c, d, e, f, g, and h were selected as temperature measurement points. Each temperature measurement point a to h is set in the height direction from the floor member 7 every 500 mm, and the room 10 side of the ceiling 8 is indicated by a black circle and the space 9 in the ceiling is indicated by a white circle. Points f and g were measured only on the ceiling 9 side of the ceiling 8.

In the cooling performance confirmation experiment, cooling in the ceiling is performed by the cooling device 16, the outside air SA is not blown by the external air conditioner 22, and the combined use of the air blow-off air conditioning with an air volume of 200 m ³ / h is used in combination. The living room 10 and the space 9 in the ceiling were measured by measuring temperatures at eight points of measurement points a, b, c, d, e, f, g, and h. The measurement results are shown in the vertical temperature distribution diagrams shown in FIGS. 7 (a) and 7 (b). FIG. 7A is a comparative example in the case where the outside air SA 22 is not blown by the external air conditioner 22, and FIG. 7B is an embodiment in the case where the cooling air in the ceiling and the entire floor air-conditioning are used in combination.
From this result, even when the outside air SA is not blown by the external air conditioner 22, there is no significant change in the temperature distribution state in the living room 10 even when the necessary amount of outside air is blown from the bottom of the double floor 6. I was able to confirm that.

In addition, when personal air conditioning from the floor member 7 shown in FIG. 4 is used instead of the full floor blowing air conditioning system, the floor member 7 is provided with personal air outlets 28a and 28b for personal convection to provide a sense of convection. Can be obtained. For this reason, it is possible to cope with not only an entirely uniform thermal environment using the entire floor blowing air-conditioning system but also environmental control using the personal floor blowing air-conditioning system.
Therefore, according to the cooling performance confirmation experiment described above, the outside air load is processed by the external air conditioner 22 and the outside air SA is supplied into the living room 10 at a temperature level substantially equal to room temperature, thereby increasing the vertical temperature difference of the cooling device 16. And the capacity of the cooling device 16 can be increased. On the other hand, when the cooling device 16 has insufficient capacity, such as when the cooling load in the living room 10 suddenly increases, the supply temperature of the outside air SA is lowered to assist the cooling of the living room 10. It can also bear.

  In the above-described embodiment, the external air conditioner 22 is used to supply the external air SA. However, an air conditioner other than the external air conditioner 22 may be used, and the external air conditioner 22 is included in the air conditioner.

DESCRIPTION OF SYMBOLS 1 Air conditioning system 6 Double floor 7 Floor member 7a Outlet 8 Ceiling 9 Ceiling space 10 Living room 13 Ceiling panel 13a Through-hole 16 Cooling device 19 Cold water piping 22 External air conditioner

Claims (4)

A cooling device that is provided in the ceiling space and cools the air by natural convection;
A ceiling having a vent hole that partitions the space in the ceiling and the room and supplies air conditioned by the cooling device to the room;
An air conditioner for supplying outside air to the living room through a blowout port of a floor member for supplying air into the double floor and partitioning the double floor and the living room;
Equipped with a,
The ceiling is composed of a metal plate panel,
The vent hole is formed in a circular shape,
The opening ratio that is the sum of the areas of the vent holes with respect to the area of the ceiling is set to 6 to 22%,
The cooling device includes a chilled water pipe for distributing a chilled water whose load can be adjusted,
In the space in the ceiling, heat exchange is performed between the cold water and air around the cold water pipe, and the cooled air moves to the ceiling side, and the ceiling cools the ceiling by heat radiation. An air conditioning system characterized in that the living room can be cooled, and the living room can be cooled by natural convection through the vent hole .   The cooling device is
  A plurality of plate fins that are spaced apart from each other in the extending direction of the cold water pipe and in which through holes penetrating in the extending direction are formed;
  The cold water pipe is inserted into the through hole of the plate fin,
  The air conditioning system according to claim 1, wherein the plate fin is arranged in a four-sided frame-shaped casing. The air-conditioning system according to claim 1 or 2 , wherein the double floor outlet is installed on the entire surface or / and part of the floor member. The outside air supplied to the living room from the outlet is configured to be controllable so as to have a wind speed that does not prevent the cooled air from descending by natural convection from the ceiling . The air conditioning system described in any one of the items .

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