JP2000234777A - Air conditioning system for building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save energy by recovering thermal energy from air conditioning exhaust gas and to enhance cleanliness of air by suppressing use of circulating air in air conditioning. SOLUTION: Conditioned air enters into an exhaust duct 5 after convecting through the living spaces 21, 22, 23 in a building 20 and since the exhaust duct abuts, at part 1 in a dashed line, on air supply ducts 4 or wraps one of them and a heat insulating material is applied to the outer circumferential part of both ducts, heat is exchanged efficiently between exhaust air and supply air. Thermal energy of exhaust gas is thereby recovered to the air supply side and energy is saved by taking supply air into an air conditioner 6. On the other hand, exhaust air from the exhaust duct 5 is not recirculated but exhausted to the outside of the building. According to the system, dust, house dust, chemical substances, bacteria, fungi, virus, allergens, smoke, and the like, storing in the building are thereby exhausted to the outside of the building and the building is filled only with clean conditioned air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention achieves energy saving by efficiently exchanging heat between an exhaust gas and air supply in air conditioning while moving a duct, and taking in the air supply which has recovered heat energy from the exhaust gas into an air conditioner. On the other hand, the present invention relates to an air conditioning system for a building that can significantly improve air cleanliness by not using exhaust gas as reflux air.

[0002]

2. Description of the Related Art At present, in many buildings, ventilation is performed by introducing fresh air which has been air-conditioned into the interior of a building, while discharging old air existing inside the building to the outside of the building. In this case, the old air should be of all amounts (100
%) To the outside of the building. This is because dust, mites, bacteria, smoke, etc. caused by the presence of people in the building float or accumulate, so the air in the building contains a lot of these substances, and indoor air is This is because it is not preferable for the user. In particular, in recent years, a number of social problems that have not been exaggerated due to insufficient ventilation have been raised, such as nosocomial infections in hospitals, allergy problems due to house dust, and health problems due to secondhand smoke.

[0003] Despite such a situation, 100% of the old air cannot be discharged outside the room or outside the building by the current air conditioning system because the loss of heat energy is enormous. In other words, in order to minimize the heat energy loss, the discharge of old air is limited to about 30%, and the remaining 7
At present, 0% of old air is mixed with fresh air as so-called reflux air and reused. When using circulating air, most of the bacteria, viruses, chemicals, etc. existing in the old air flow back into the building as it is,
As a result, these are accumulated in the building. Furthermore, a serious problem is that serious bacteria and viruses that exist in a particular room, such as an intensive care unit, are infinitely distributed to other general rooms when the recirculating air is recirculated. It can be raised. In other words, with the current ventilation system, bacteria and viruses that originally existed in separate rooms in hospitals and the like gradually spread throughout the hospital building, and consequently hospital infections etc. must be promoted. It can be said that the system cannot be obtained. In this case, about 30% of the exhaust gas discharged outside the building,
The heat energy in the exhaust gas is not recovered and is discharged out of the building as it is, and the current ventilation system still has a large energy loss.

[0004] On the other hand, in the air conditioning method in ordinary households, it is rare to recirculate and use the recirculated air, but in general, the exhaust is performed naturally rather than forcibly. That is, fresh air is constantly supplied to the room because the recirculated air is not recirculated. And the staying air exist in a unified manner, so that it is far from the situation where the air having a longer staying time is discharged in order. In other words, in this case, the exhaust air does not circulate as recirculated air, so that "blowing amount = exhaust amount" and the loss of thermal energy becomes extremely large, but it is far from the goal of always filling the room only with fresh air. You can say that.

[0005] In any case, according to the current air conditioning method, the recovery of heat energy is insufficient.
At the same time, the aforementioned problems of hospital-acquired infections, allergies, and secondhand smoke are postponed as major social problems without being solved.

[0006]

The biggest reason for having to set the reflux air to about 70% in the prior art is that thermal energy cannot be sufficiently recovered from exhaust air. In other words, because the technology for recovering heat energy from exhaust gas was insufficient, energy saving was not sufficient,
Moreover, it can be said that the ventilation of the building, which is one of the primary purposes of air conditioning, was insufficient.

The present invention recovers heat energy from exhaust gas to air supply while keeping the exhaust duct and the air supply duct adjacent to each other or including one of them, and suppressing heat energy from diffusing outside the duct system. Energy saving by introducing air supply to the air conditioner after the recovery of heat energy, while improving air cleanliness by not introducing exhaust air to the air conditioner as circulating air. The purpose is to provide an improved air conditioning system.

[0008]

According to a first aspect of the present invention, there is provided an air conditioning system for a building, wherein an exhaust duct and an air supply duct are adjacent to each other or include one of them, thereby enabling heat exchange between the two ducts. The outer peripheries of the two ducts are covered with a heat insulating material (the two ducts are referred to as “heat exchange type supply / discharge ducts”), while the air supply via the supply ducts of the heat exchange type supply / discharge ducts is air-conditioned. It is a system to take in.

Therefore, it is possible to recover the heat energy from the exhaust gas to the air supply between the exhaust duct and the air supply duct of the heat exchange type air supply / discharge duct, and to transfer the heat energy to the outside of the duct system before and after the heat energy recovery. Is also suppressed, so that the efficiency of recovering the heat energy is improved. By introducing the air supply after recovering the heat energy into the air conditioner and using it, energy saving can be remarkably achieved. Here, when heating with an air conditioner, the warm air of the exhaust gas is collected to the air supply side, and when cooling with the air conditioner, the cool air of the exhaust gas is collected to the air supply side. The term “recovery of heat energy” in the above includes both cases (the same applies to the recovery of heat energy hereinafter).

According to a second aspect of the present invention, there is provided an air conditioning system for a building according to the first aspect of the present invention, wherein any recirculated air including exhaust gas discharged from an exhaust duct is not taken into the air conditioner. It is what it was.

Therefore, the air supplied to the air conditioner does not include any exhaust gas, and the dust and air accumulated in the building are not included.
Dust, bacteria, pathogens, viruses, allergens, smoke, etc. are discharged out of the building, and the building is filled only with clean air-conditioned air.

According to a third aspect of the present invention, there is provided an air conditioning system for a building according to the first or second aspect of the present invention, wherein the heat exchange type supply / exhaust duct includes an “exhaust duct / air supply duct / connection pipe”. A unit structure having a “heat insulation layer” as a constituent element, and the units can be connected to each other.

Therefore, if the heat exchange type supply / discharge duct unit is freely connected and disposed by utilizing the empty space such as a ceiling surface, a floor surface, and a wall surface, the effective area of heat exchange can be increased as much as possible. As a result, desired energy saving can be achieved. At the same time, the air supply taken into the air conditioner can take measures that do not include any exhaust gas accumulated in the building, in which case dust, dust, bacteria, pathogens, viruses, allergens, Smoke and the like are completely discharged to the outside of the building, and the building can be filled only with clean air-conditioned air. That is, by incorporating the heat exchange type supply / exhaust duct unit into the air conditioning system of the building, energy saving and complete air purification can be achieved at the same time.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below to make the present invention easier to understand. The embodiment shows one embodiment of the present invention, and does not limit the present invention. That is, it can be arbitrarily changed within the scope of the present invention.

FIG. 1 is an explanatory view showing an air conditioning system for a building according to the present invention. At each level of the building 20, there are living spaces 21, 22, and 23. In these living spaces, the outside air 9 taken in at the outside air inlet 19 enters the air conditioner 6 through the air supply duct 4, and the temperature and After adjusting the humidity and the like, the air is sent to the air duct 10 by the blower 7, and is blown out to the living space from the outlets 11, 13, and 15 provided in the living space of each floor.

On the other hand, the blown air convects in the living space, and then the suction port 1 provided at an appropriate place in each living space.
The air is sucked from 2, 14, and 16 and enters the exhaust duct 5, and is exhausted to the outside of the building through the exhaust fan 8 as exhaust 18. In this case, the air supply duct 4 and the exhaust duct 5 disposed on the wall surface have a heat exchange function adjacent to each other at a portion surrounded by a broken line, and the outer peripheral portion is covered with a heat insulating material. Therefore, the heat energy is recovered from the exhaust gas to the supply air in the part 1, and the supply air having recovered the heat energy from the exhaust gas is supplied to the six air conditioners. In this case, as shown in FIG. 1, the heat exchange portion does not need to be the entire length of both ducts, and may be a part in consideration of heat exchange efficiency and the like. FIG. 1 shows that all the exhaust air from the building is exhausted to the outside of the building via the exhaust fan 8, which corresponds to claim 2.

On the other hand, claim 1 is not limited to this point, but from the viewpoint of energy saving, a part of the exhaust gas may be introduced again into the air conditioner as reflux air. That is, in the air conditioning system for a building that is currently widely used as shown in FIG. 6, about 70% of the exhaust gas discharged from the exhaust fan 8 is recycled air duct 25.
Is introduced into the air conditioner 6 and reused as circulating air. In this case, about 30% of the air is exhausted to the outside of the building by the exhaust fan 8, but the 30% exhaust is A great deal of thermal energy remains contained. However, even if the system of the present invention using the heat exchange type supply / exhaust duct in part 1 of FIG. 1 is adapted to the conventional air conditioning system using a part of the exhaust gas of FIG. 6 as reflux air,
It is clear that a considerable amount of heat energy can be recovered from the 30% exhaust to the air supply side. In other words, claim 1 has the merit that the energy saving effect is great even if it is applied to a current air conditioning system using circulating air.

In FIG. 1, for convenience of explanation of the entire system of the present invention, a portion where "exhaust duct and air supply duct are adjacent to each other or one of them is included so that heat can be exchanged between both ducts", that is, so-called heat Although the exchange type supply / discharge duct is macroscopically and illustratively indicated by a broken line 1, this will be described in detail below.

FIG. 2 is a schematic partial front view of the heat exchange type supply / discharge duct disposed on the wall surface of the living space 21. The outside air taken in at the outside air inlet 19 enters through the air supply inlet 41 to be supplied air, and is introduced into the heat exchange type supply / discharge duct 44.
The air supply passes through an air supply duct in the heat exchange type air supply and exhaust duct,
The air enters the air supply duct of the adjacent heat exchange type air supply / discharge duct 45 via the air supply duct connecting pipe 52. In this case, the air supply duct connection pipe 52 connects the air supply / exhaust port of the air supply duct in the heat exchange type air supply / discharge duct 44 and the air supply intake port of the heat exchange type air supply / discharge duct 45. Thereafter, the air supply gradually passes through the heat exchange type air supply / discharge ducts 46, 47, 48, and then exits from the air supply / exhaust port 43, and passes through the air supply duct 4 of FIG.
After passing through a similar heat exchange type air supply / discharge duct disposed on the wall of the air conditioner, the air enters the air supply duct 4 again and finally reaches the air conditioner 6. On the other hand, the exhaust gas enters the heat exchange type supply / discharge duct 44 from the exhaust intake port 40 connected to the exhaust duct 5. The exhaust gas passes through an exhaust duct in the heat exchange type supply / discharge duct 44, and enters an exhaust duct of an adjacent heat exchange type supply / discharge duct 45 via an exhaust duct connecting pipe 51. In this case, the exhaust duct connecting pipe 51 connects the exhaust outlet of the exhaust duct in the heat exchange type supply / discharge duct 44 and the exhaust intake port of the heat exchange type supply / discharge duct 45. Thereafter, the exhaust gas gradually passes through the heat exchange type supply / discharge ducts 46, 47, and 48, then exits from the exhaust discharge port 42, enters the exhaust duct 5 in FIG. 1 again, and reaches the exhaust fan 8. At this time, since the air supply duct and the exhaust duct are adjacent to each other in the heat exchange type supply / discharge duct, heat exchange is performed between the air supply and the exhaust while passing through both ducts, and Recovery of thermal energy to the air supply is performed.

FIG. 3 is a sectional view taken along line AA in FIG. The peripheral portion of the heat exchange type supply / discharge duct 46 is surrounded by a heat insulating layer 61, in which a rectangular duct pipe 60 is housed. The rectangular duct pipe 60 has a partition plate 59 fixed inside, and the partition plate 59 divides the internal space into an exhaust duct 57 and an air supply duct 56. Therefore, the exhaust gas passes through the exhaust duct 57 and the air supply
While passing through 6, heat exchange is performed between the exhaust gas and the air supply through the partition plate 59, and heat energy is recovered from the exhaust gas to the air supply. The exhaust duct 57 is connected to an exhaust duct connecting pipe 58.
The air supply duct 56 is connected to the air supply duct connecting pipe 5.
Connect with 5.

The heat exchange type air supply / discharge duct can be arranged singly or plurally in an empty space such as a ceiling surface, a floor surface, a wall surface or the like. The connection can be made in the lateral direction as shown in FIG. 2 or in the longitudinal direction. Therefore, according to the system using the heat exchange type supply / discharge duct, the length of the heat exchange type supply / discharge duct required to achieve the desired heat exchange is calculated in advance,
In order to realize this length, the free space on the ceiling surface, floor surface and wall surface can be freely used. In addition,
The connection of the plurality of heat exchange type supply / discharge ducts can be performed by using a flexible pipe or other commonly used connecting material. In any heat exchange type supply / discharge duct, a heat insulating material layer 61 is provided outside the duct, and a heat insulating material layer, a moistureproof material layer, and the like are appropriately provided inside and outside the heat insulating material layer.
Alternatively, these members may be mixed and used in the heat insulating material layer. On the other hand, the partition plate 59 is preferably processed with a material having a high thermal conductivity, and usually uses a metal such as aluminum or copper, but the material is not limited to these, and other metals, resins, or It may be a composite of both. The material of the rectangular duct tube 60 is often a metal such as tin or steel, but may be a resin or a composite of a metal and a resin.

FIG. 4 is a partially exploded perspective view of a heat exchange type supply / discharge duct unit showing another embodiment of the present invention. The heat exchange type supply / discharge duct unit 93 of FIG.
The outer peripheral portion is composed of heat insulating layers 76 and 77, and accommodates rectangular duct tubes 78 and 99 therein. The inner space of the rectangular duct pipe is partitioned into a plurality of triangular cylinders, for example, 95 and 96 by a partition plate 81. In this case, the group 82 in which the triangular cylindrical bottom surface is on the upper surface of the square duct tube 78,
94, 96, 98 and two groups 83, 95, 97, 99 whose bottoms are on the underside of the rectangular duct tube 78. The former is collected in the air supply duct 85 through the circular holes 71 and 72 formed in the upper surface of the rectangular duct pipe.
The latter is collected in an exhaust duct 86 through circular holes 74 and 75 formed in the lower surface of the rectangular duct pipe. That is, the rectangular duct pipe 78, which is the main body of the heat exchange type supply / discharge duct unit, divides the inside of the rectangular duct pipe into a plurality of exhaust duct pipes and an air supply duct pipe by a jagged partition plate 81. Each single pipe has a structure in which air supply and exhaust air are adjacent to each other.

First, exhaust gas is introduced from an exhaust gas inlet 90 and enters an exhaust duct 91 of the heat exchange type supply / discharge duct. Next, a triangular cylindrical exhaust duct 83 divided into a plurality of pieces through a perforation formed in the upper surface of the wall of the exhaust duct,
95, 97, and 99, and are collected again in one exhaust duct 86 from perforations 74 and 75 formed in the lower surface of the plurality of exhaust ducts at the end portions thereof.
Get out of. After that, the exhaust gas enters the exhaust duct 5 of FIG. 1 and eventually reaches the exhaust fan 8. On the other hand, air is supplied from an air supply inlet 84 to an air supply duct 85 of a heat exchange type air supply / discharge duct unit.
to go into. Next, a triangular cylindrical exhaust duct such as 82, 94, 96, 9 is divided into a plurality of pieces by passing through perforations 71, 72 formed in the lower surface of the wall of the air supply duct.
1 and is collected again in one exhaust duct 89 from a perforation formed in the upper surface of the duct at the end portions of the plurality of air supply ducts. It enters the duct 4 and finally reaches the air conditioner 6. In this case, while the supply air and the exhaust air pass through each of the triangular cylindrical ducts divided into a plurality of sections, the respective ducts are adjacent to each other via the partition plate 81, so that heat exchange is performed at this portion. Is performed, and the heat energy of the exhaust gas is recovered to the air supply.

Although FIG. 4 is divided into three parts, that is, a part including the air supply inlet 84, a part 93 and the part including the air supply outlet 88, the drawing is made for convenience of explanation. In practice, the three parts are integrated, and the five perforations shown on the part including the air intake 84 and the five perforations shown on the top of the part 93 are shown. The perforations are identical and therefore the air intake 84
Is slid to the side of the portion 93 to align the five perforations, and similarly, the portion including the air supply outlet 88 is 9
When the heat-insulating layer 76 and the heat-insulating layer 93 are integrated by sliding to the part 3 side, the duct after the sliding becomes the structure of the actual heat exchange type supply / discharge duct unit.

FIG. 5 is a partially exploded perspective view of a heat exchange type supply / discharge duct unit showing another embodiment of the present invention. The outer peripheral portion of the heat exchange type supply / discharge duct unit in FIG.
An exhaust duct and an air supply duct are housed inside. In the exhaust duct, a space portion 101 including an exhaust inlet 100 and a space portion 106 including an exhaust outlet 105 face each other, and these two portions are connected to a plurality of cylindrical exhaust duct branch pipes such as 102, 121, 122. Are connected to form a single exhaust duct system. On the other hand, in the air supply duct, the space 104 including the air intake 103 and the space 107 including the air discharge 113 are opposed to each other, and only the space 112 exists between the two parts. A plurality of cylindrical exhaust duct branch pipes such as 10
2, 121 and 122 are provided. In addition, the air supply duct 104 including the air intake 103 and the air supply duct 107 including the air supply outlet 113 are disposed to face each other, and are drawn in a state separated from each other in FIG.
This is a measure for convenience of explanation, and an air supply duct wall surface 116 having a heat insulating layer 117 is present on the upper surface of the space 112 between these two air supply ducts. A wall 118 is present. That is, the air supply duct is a single rectangular parallelepiped duct composed of four surfaces of the wall surfaces 108, 110, 116, and 118 and two spaces 104 and 107, and a plurality of exhaust duct branch pipes are provided in the duct. It is disposed orthogonal to the direction of air supply, and has a structure in which an exhaust duct branch pipe is included in the air supply duct.

First, the exhaust gas enters through the exhaust intake port 100 and is introduced into the exhaust duct 101, and then the perforations formed in the inner wall 110 of the exhaust duct, for example, 111,
124, 125 from the exhaust duct branch pipe, for example 102,
Enter 121 and 122. Then, the air returns to one exhaust duct 106 again through perforations 109, 128, and 129 formed in the wall surface 108 of the exhaust duct 106 disposed opposite to the exhaust duct 101. Next, the exhaust gas is discharged from the exhaust outlet 105 through the exhaust duct. On the other hand, the air supply is taken in from the air supply inlet 103 and enters the air supply duct 104. Then, the air passes through the space 112 in this portion while contacting the outer wall surfaces of the exhaust duct branch pipes, for example, 102, 121, 122, and reaches the air supply duct 107 disposed opposite thereto. Thereafter, the supply air is discharged from the supply air outlet 113.

In this case, when the supply air passes through the space 112, the supply air is adjacent to the exhaust via the outer wall of the exhaust duct branch pipe, so that heat exchange is performed at this location. Therefore, the heat energy of the exhaust gas is recovered to the air supply side. The heat exchange type supply / discharge duct unit shown in FIG. 5 is connected to the air supply duct 4 and the exhaust duct 5 in FIG. 1 and constitutes a part of a duct system surrounded by a broken line. That is, the air supply duct 4 is connected to the air supply inlet 103 of the heat exchange type air supply / discharge duct unit, and the air supply / exhaust port 113 of the heat exchange type air supply / discharge duct unit is connected to the air supply duct 4 again to perform heat exchange. The supply air passing through the mold supply / discharge duct unit is finally guided to the air conditioner 6. On the other hand, exhaust duct 5
Is connected to the exhaust inlet 100 of the heat exchange type air supply / discharge duct unit, and is connected to the exhaust air outlet 10 of the heat exchange type air supply / discharge duct unit.
5 is again connected to the exhaust duct 5, and the exhaust gas that has passed through the heat exchange type supply / discharge duct finally reaches the exhaust fan 8. In this case, the exhaust duct 5 may be connected to the exhaust inlet 100 or to the exhaust outlet 105. Air supply duct 4
The flow of air supply and exhaust in the exhaust duct 5 may be countercurrent or cocurrent depending on the situation at the site. In the case of cocurrent, the flow direction shown in FIG. In this case, it is more reasonable to reverse the exhaust flow.

In FIG. 5, a plurality of exhaust duct branch pipes are present and have a cylindrical shape. However, the present invention is not limited to this. It may be square. The material may be a metal, resin, fiber, or a composite thereof having good thermal conductivity. In addition, polystyrene, vinyl chloride, polyurethane, perlite,
Cork, corrugated glass, foamed glass, molded products such as glass wool and foamed molded products are used, but the present invention is not particularly limited to these, and also, moisture-proof materials and sound-insulating materials other than heat-insulating materials,
Use in combination with refractory materials, etc. can be used at all.

Experimental Example: An experiment of heat exchange using two ducts having inner diameters of 30 cm and 20 cm, placing the latter in the former, using the outside as an exhaust duct, and using the inside as an air supply duct to flow exhaust and air supply. Was done. Further, glass wool was used as a heat insulating material, and an exterior was applied to the outside of the exhaust duct with a thickness of about 5 cm. Aluminum with a thickness of 1 mm was used for the air supply duct, and steel with a thickness of 3 mm was used for the exhaust duct.

After circulating the conditioned air from an air conditioner used in a room having an effective volume of 50 m ^{3 into} the room, the exhaust is connected to the exhaust duct, while the air supplied from the air supply duct is supplied. Was introduced into the air conditioner. In addition,
The air conditioner is 50 m ³ / hr. And the set temperature in the room was 25 ° C. The extension distance of the heat exchange type supply / discharge duct was 12 m.

In the experiments, (1) when only the air supply duct of the heat exchange type supply / discharge duct was used and the exhaust was not passed, (2) both heat exchange type supply / exhaust ducts were used and the heat insulating material was not provided. In the case where (3) both heat exchange type supply / exhaust ducts were used and the heat insulating material was used and the heat insulating material was provided, the exhaust temperature at the outlet of the exhaust duct and the supply temperature at the inlet of the air conditioner were measured for the three cases. . As a result, the exhaust temperature was “20 ° C., 12 ° C., 7 ° C.” in the order of the experiment, and the supply temperature was “5 ° C.” in the order of the experiment.
° C, 10 ° C, 22 ° C ".

From these results, when the exhaust duct and the air supply duct are arranged adjacent to each other to provide a heat exchange function, and when the outer surfaces of the two ducts are covered with a heat insulating material, the discharge from the exhaust gas to the air supply is performed. It has been found that the recovery of heat energy can be achieved very efficiently.

[0033]

According to the air conditioning ventilation system of the present invention, high-quality ventilation of a building can be easily and easily achieved with a small loss of heat energy as compared with the current air conditioning ventilation system. That is, when the air supply duct and the exhaust duct are adjacent or one of them is enclosed and the outer peripheral portions of both ducts are covered with a heat insulating material, and when heat exchange is performed between the air supply and the exhaust, much of the heat energy of the exhaust is removed. It can be collected on the air supply side, and high energy saving can be achieved by introducing the air supply to the air conditioner. In addition, bacteria, dust, ticks, chemicals, etc. in the building can be quickly discharged to the outside of the building by measures not to circulate exhaust air, so that bacteria in hospitals and other places where many carriers are gathered And the accumulation and accumulation of viruses, dust, etc.
The use of circulating air can prevent the spread of bacteria, viruses and the like throughout the building. Thus, various nosocomial infections in a hospital can be prevented, and prevention of various allergies, asthma and bacterial infection can be achieved with energy saving. Further, prevention of cross-contamination of drugs, bacteria and the like in pharmaceutical companies and the like can be achieved with energy saving.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an air conditioning system for a building of the present invention.

FIG. 2 is a schematic partial front view when a heat exchange type supply / discharge duct according to the present invention is disposed on a wall surface.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a partially exploded perspective view of a heat exchange type supply / discharge duct unit according to another embodiment of the present invention.

FIG. 5 is a partially exploded perspective view of a heat exchange type supply / discharge duct unit according to another embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a conventional building air conditioning system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchange type supply / exhaust duct 4 Air supply duct 5 Exhaust duct 6 Air conditioner 7 Blower 8 Exhaust air 9 Outside air 10 Blow duct 11, 13, 15 Outlet 12, 14, 16 Inlet 19 Outside air intake 20 Multi-story building 25 Duct for recirculated air 61, 76, 77, 117, 120, 130 Thermal insulation layer 102, 121, 122 Exhaust duct branch pipe

Claims (3)

[Claims] An exhaust duct and an air supply duct are adjacent to each other or one of them is included, an outer peripheral portion is covered with a heat insulating material, and heat exchange between the exhaust air and the air supply is performed between the two ducts. An air conditioning system for a building, characterized in that the air supply after heat exchange is taken into an air conditioner. 2. The air conditioning system for a building according to claim 1, wherein any reflux air including exhaust gas discharged from the exhaust duct is not taken into the air conditioner. 3. The heat exchange type supply / discharge duct according to claim 1, wherein the unit is constituted by an air supply duct, an exhaust duct, a connecting pipe, and a heat insulating material layer, and one or more of the units are used. The air conditioning system for a building according to claim 1 or 2, wherein: