Ventilation system

Abstract

To provide a ventilation system which achieves reduction in air conditioning energy by recovering sufficient heat from general exhaust air and odor exhaust air while maintaining comfort in a general room.SOLUTION: A ventilation system 100 includes: a total heat exchange part 11 for general exhaust air for performing total heat exchange between general exhaust air EA1 taken out from a general room R1 to a general exhaust air passage 30 and supply air SA1 taken into a room R; and a total heat exchange part 41 for odor exhaust air for performing total heat exchange between odor exhaust air EA2 taken out from an odor generation chamber R2 separate from the general chamber R1 to an odor exhaust air passage 60 and supply air SA2 taken into the room R. A first supply air passage 20 in which the supply air SA1 passing the total heat exchange part 11 for general exhaust air circulates is provided as the one that introduces the supply air SA1 into the general room R1, and a second supply air passage 50 in which the supply air SA2 passing the total heat exchange part 41 for odor exhaust air circulates is provided as the one that allows the supply air SA2 to merge into the first supply air passage 20.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a ventilation system including a total heat exchanger for general exhaust that performs total heat exchange between general exhaust taken out from a general room and supply air taken into the room, and a total heat exchanger for odor exhaust that performs total heat exchange between odor exhaust taken out from an odor generation room separate from the general room and supply air taken into the room.

Background Art

[0002] In facilities such as office buildings, an odor generation room where odors are generated, such as a toilet, is provided separately from general rooms such as tenant-exclusive areas. In such facilities, generally, in order to prevent the odor in the odor generation room from flowing into the general room through the exhaust air duct, the odor exhaust taken out from the odor generation room and the general exhaust taken out from the general room are each discharged to the outside (outdoor) through separate independent exhaust air ducts. And, as a ventilation system provided in such a facility, in order to recover heat not only from general exhaust but also from odor exhaust and further reduce the air-conditioning heat source load, a total heat exchanger for general exhaust that performs total heat exchange between general exhaust taken out from a general room and supply air taken in from the outside, and a total heat exchanger for odor exhaust that performs total heat exchange between odor exhaust taken out from an odor generation room separate from the general room and supply air taken in from the outside are each separately provided (see, for example, Patent Document 1).

[0003] Furthermore, in the ventilation system described in Patent Document 1, the supply air ducts (suction duct 9, supply duct 10) through which the supply air (outdoor air) flowing through the total heat exchanger for general exhaust (heat exchange element 6) passes are provided as supply air ducts for the general room that introduce the supply air into the general room (clean room 1), and the supply air ducts (suction duct 34, supply duct 35) through which the supply air (outdoor air) flowing through the total heat exchanger for odor exhaust (heat exchange element 31) passes are provided as supply air ducts for the odor generation room that introduce the supply air into the odor generation room (2). That is, in the ventilation system described in this Patent Document 1, the supply and exhaust of air to and from the general room are performed through the total heat exchanger for general exhaust, and independently of the supply and exhaust of air to and from the general room, the supply and exhaust of air to and from the odor generation room are performed through the total heat exchanger for odor exhaust.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the ventilation system described in the above Patent Document 1, in order to prevent the outflow of odor from the odor generation room to the general room, the supply air volume to the general room is made larger than the exhaust air volume from the general room, and then the supply air volume to the odor generation room is made smaller than the exhaust air volume from the odor generation room, so that it is necessary to keep the odor generation room at a negative pressure lower than that of the general room. Then, in the total heat exchanger for odor exhaust where the supply and exhaust of air to and from the odor generation room are performed, since the supply air volume is less than the exhaust air volume, the heat that can be recovered from the exhaust by the total heat exchange with the supply air is reduced, and there is a problem that the effect of reducing air conditioning energy cannot be fully exerted.

[0006] In order to solve such problems, it is conceivable to introduce the supply air that has passed through the total heat exchanger for odor exhaust into the general room instead of the odor generation room, and increase the supply air volume in the total heat exchanger for odor exhaust to a volume sufficient to recover sufficient heat from the odor exhaust. However, in the total heat exchanger for odor exhaust, since total heat exchange is performed between the supply air and the odor exhaust, there is a possibility that a part of the odor contained in the odor exhaust flows into the supply air. Then, since the supply air containing the odor is introduced into the general room as it is, there is a problem that the comfort of the general room is impaired.

[0007] In view of this actual situation, the main problem of the present invention is to provide a technology that realizes reduction of air-conditioning energy by recovering sufficient heat from general exhaust air and odor exhaust air while maintaining the comfort of a general room in a ventilation system including a total heat exchanger for general exhaust air that performs total heat exchange between general exhaust air taken out from the general room and supply air taken into the room, and a total heat exchanger for odor exhaust air that performs total heat exchange between odor exhaust air taken out from an odor generation room different from the general room and supply air taken into the room.

Means for Solving the Problems

[0008] A first feature configuration of the present invention is a ventilation system including a total heat exchanger for general exhaust air that performs total heat exchange between general exhaust air taken out from a general room and supply air taken into the room, and a total heat exchanger for odor exhaust air that performs total heat exchange between odor exhaust air taken out from an odor generation room different from the general room and supply air taken into the room, wherein a first supply air duct through which the supply air passing through the total heat exchanger for general exhaust air flows is provided to introduce the supply air into the general room, and a second supply air duct through which the supply air passing through the total heat exchanger for odor exhaust air flows is provided to merge the supply air into the first supply air duct.

[0009] According to this configuration, the supply air that passes through the first supply air passage and then passes through the total heat exchanger for general exhaust and is introduced into the general room is merged with the supply air that passes through the second supply air passage and then passes through the total heat exchanger for odor exhaust. Therefore, even if a part of the odor contained in the odor exhaust flows into the supply air in the total heat exchanger for odor exhaust, the supply air containing the odor is merged from the second supply air passage into the first supply air passage and diffused and diluted by the supply air that has passed through the total heat exchanger for general exhaust, and then is introduced into the general room from the first supply air passage. Thus, it is possible to suppress the deterioration of the comfort of the general room due to the introduction of the supply air containing odor. Furthermore, the supply air after passing through the total heat exchanger for odor exhaust is introduced into the general room instead of the odor generation room, and only exhaust is performed for the odor generation room. Therefore, the supply air volume in the total heat exchanger for odor exhaust can be increased to an air volume sufficient to recover sufficient heat from the odor exhaust, keeping the odor generation room at a negative pressure compared to the general room, and preventing the outflow of odor from the odor generation room to the general room.

[0010] Therefore, according to the present invention, in a ventilation system including a total heat exchanger for general exhaust that performs total heat exchange between the general exhaust taken out from the general room and the supply air taken into the room, and a total heat exchanger for odor exhaust that performs total heat exchange between the odor exhaust taken out from an odor generation room different from the general room and the supply air taken into the room, it is possible to recover sufficient heat from the general exhaust and the odor exhaust while maintaining the comfort of the general room, thereby realizing the reduction of air conditioning energy.

[0011] The second characteristic configuration of the present invention is that in the first supply air passage, the confluence point of the second supply air passage is located upstream of the supply air fan for passing the supply air through the first supply air passage.

[0012] According to this configuration, in the first air supply duct, since the confluence point of the second air supply duct is located upstream of the air supply fan, even without providing a dedicated air supply fan for the second air supply duct, it is possible to pass the air supply through the second air supply duct provided with the total heat exchanger for odor exhaust only by the blowing power of the air supply fan for passing the air supply through the first air supply duct. Further, since the air supply including odor that merges from the second air supply duct into the first air supply duct will surely pass through the air supply fan, it is possible to introduce the air supply into the general room after diffusing the air supply more favorably.

[0013] The third characteristic configuration of the present invention lies in that, in the first air supply duct, the confluence point of the second air supply duct is located downstream of the total heat exchanger for general exhaust.

[0014] According to this configuration, in the first air supply duct, since the confluence point of the second air supply duct is located downstream of the total heat exchanger for general exhaust, the air supply that merges from the second air supply duct into the first air supply duct after passing through the total heat exchanger for odor exhaust is introduced into the general room without passing through the total heat exchanger for general exhaust. Therefore, although the air supply volume from the first air supply duct to the general room increases due to the confluence of the air supply from the second air supply duct into the first air supply duct compared to the case where there is no such confluence, the air supply volume in the total heat exchanger for general exhaust can be suppressed to an appropriate air volume suitable for the total heat exchange with general exhaust without increasing it, and an increase in the size of the total heat exchanger for general exhaust due to the confluence of the air supply from the second air supply duct into the first air supply duct can be avoided.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0016] Embodiments of the present invention will be described with reference to the drawings. First, the configuration of the ventilation system (hereinafter referred to as "this system") 100 of the present embodiment will be described with reference to FIG. 1.

[0017] This system 100 is configured as a ventilation system for ventilating facilities such as office buildings. In the present embodiment, an office building is exemplified as the facility, but it can of course be applied to other facilities as well. In the office building where this system 100 is installed, an odor generation room where odors are generated, such as a toilet R2, is provided separately from general rooms such as the tenant exclusive part R1. Further, in the present embodiment, a corridor R3 is interposed between the tenant exclusive part R1 and the toilet R2.

[0018] This system 100 is configured to include an outdoor air treatment air conditioner 10 and a total heat exchanger 40. Note that, separately from this system 100, an air conditioner for air-conditioning the tenant exclusive part R1 or the like may be installed. Connected to the outdoor air treatment air conditioner 10 are a general exhaust air duct 30 through which general exhaust air EA1 taken out from the tenant exclusive part R1 flows, and a first supply air duct 20 through which supply air SA1 taken into the tenant exclusive part R1 flows. A total heat exchange element 11 (an example of a total heat exchange part for general exhaust air), which performs total heat exchange between the general exhaust air EA1 flowing through the general exhaust air duct 30 and the supply air SA1 flowing through the first supply air duct 20, is provided. Further, the total heat exchange element 11 that performs total heat exchange between the general exhaust air EA1 and the supply air SA1 is of a rotary type (rotor type) with a relatively high processing capacity, and this enables the processing of relatively large-volume supply and exhaust air while suppressing an increase in size.

[0019] On the downstream side of the total heat exchange element 11 in the general exhaust air duct 30, a general exhaust fan 35 is provided for taking out the indoor air RA1 of the tenant exclusive area R1 as the general exhaust EA1 into the general exhaust air duct 30. On the other hand, on the downstream side of the total heat exchange element 11 in the first supply air duct 20, a supply air fan 22 is provided for taking in the outside air OA of the outdoors O as the supply air SA1 introduced into the tenant exclusive area R1 into the first supply air duct 20. Further, between the total heat exchange element 11 and the supply air fan 22 in the first supply air duct 20, a temperature control unit 23 for temperature-adjusting the supply air SA1 after passing through the total heat exchange element 11 is provided. And these general exhaust fan 35, supply air fan 22, and temperature control unit 23 are built in the outside air treatment air conditioner 10 as component devices.

[0020] In short, the outside air OA of the outdoors O is taken into the first supply air duct 20 as the supply air SA1, and the supply air SA1 recovers heat from the general exhaust EA1 by the total heat exchange element 11 and is then temperature-adjusted by the temperature control unit 23, and then blows out from the first supply air duct 20 into the tenant exclusive area R1. On the other hand, the indoor air RA1 of the tenant exclusive area R1 is taken into the general exhaust air duct 30 as the general exhaust EA1, and the general exhaust EA1 recovers heat from the supply air SA1 by the total heat exchange element 11 and is then discharged from the general exhaust air duct 30 to the outdoors O.

[0021] In the first supply air duct 20, there are provided a VAV27 which is a variable air volume control device for setting the air volume of the supply air SA1 (outside air OA) flowing from the outdoors O into the outside air treatment air conditioner 10 to a desired set supply air volume, and a VAV29 which is a variable air volume control device for setting the air volume of the supply air SA1 introduced from the outside air treatment air conditioner 10 into the tenant exclusive area R1 to a desired set supply air volume.

[0022] The total heat exchanger 40 is connected to an odor exhaust air duct 60 through which the odor exhaust EA2 taken out from the toilet R2 flows, and a second supply air duct 50 through which the supply air SA2 taken into the room R flows. A total heat exchange element 41 (an example of an odor exhaust total heat exchange section), which performs total heat exchange between the odor exhaust EA2 flowing through the odor exhaust air duct 60 and the supply air SA2 flowing through the second supply air duct 50, is provided. In addition, the total heat exchange element 41 that performs total heat exchange between the odor exhaust EA2 and the supply air SA2 is a stationary type that can substantially completely partition these flow paths. As a result, the leakage rate of odor from the odor exhaust EA2 to the supply air SA2 is reduced.

[0023] The odor exhaust air duct 60 is provided with an odor exhaust fan 65 for taking out the indoor air RA2 of the toilet R2 as the odor exhaust EA2 into the odor exhaust air duct 60. Since the odor exhaust fan 65 is provided separately from the general exhaust fan 35 described above, the exhaust air volume from the toilet R2 can be adjusted to a small air volume independently of the exhaust air volume from the tenant exclusive section R1. On the other hand, although details will be described later, since the downstream end of the second supply air duct 50 is connected to a confluence point 25 located upstream of the supply air fan 22 in the first supply air duct 20, the supply air fan 22 also functions as a supply air fan for taking in the outside air OA of the outdoors O as the supply air SA2 into the second supply air duct 50 and introducing it into the room R (tenant exclusive section R1). The second supply air duct 50 is provided with a damper 55 capable of interrupting the flow of the supply air SA2 in the second supply air duct 50.

[0024] In short, the outside air OA of the outdoors O is taken into the second supply air duct 50 as the supply air SA2, and the supply air SA2 recovers heat from the odor exhaust EA2 by the total heat exchange element 41, and then blows out from the second supply air duct 50 into the room R (tenant exclusive section R1). On the other hand, the indoor air RA2 of the toilet R2 is taken into the odor exhaust air duct 60 as the odor exhaust EA2, and the odor exhaust EA2 has heat recovered from the supply air SA2 by the total heat exchange element 41, and then is discharged from the odor exhaust air duct 60 to the outdoors O.

[0025] As described above, the odor exhaust gas EA2 extracted from the toilet R2 is discharged outdoors O through a separate odor exhaust air duct 60 independent of the general exhaust air duct 30 through which the general exhaust gas EA1 extracted from the tenant-exclusive area R1 flows. Therefore, the odor of the toilet R2 is prevented from flowing into the tenant-exclusive area R1 through these exhaust air ducts 30 and 60. Also, since the supply air SA1 and SA2 that recover heat from both the general exhaust gas EA1 and the odor exhaust gas EA2 are introduced into the room R (tenant-exclusive area R1) by the total heat exchange elements 11 and 41, the air conditioning heat source load can be reduced.

[0026] In the tenant-exclusive area R1, a ventilation window 73 that can be opened and closed is provided in the outer wall portion facing the outdoors O. Also, the tenant-exclusive area R1 and the corridor R3 communicate with each other through a ventilation port 71, and the corridor R3 and the toilet R2 communicate with each other through a ventilation port 72.

[0027] This system 100 adopts a configuration for sufficiently recovering heat from the general exhaust gas EA1 and the odor exhaust gas EA2 while maintaining the comfort of the tenant-exclusive area R1 to achieve reduction of air conditioning energy, and the details thereof will be described below.

[0028] A first supply air duct 20 through which the supply air SA1 passing through the total heat exchange element 11 of the outdoor air treatment air conditioner 10 flows is provided to introduce the supply air SA1 into the tenant-exclusive area R1, and a second supply air duct 50 through which the supply air SA2 passing through the total heat exchange element 41 of the total heat exchange device 40 flows is provided to merge the supply air SA2 into the first supply air duct 20.

[0029] That is, the supply air SA2 that has passed through the total heat exchange element 41 of the total heat exchanger 40 after flowing through the second supply air duct 50 is merged with the supply air SA1 that is introduced into the tenant exclusive area R1 after passing through the total heat exchange element 11 of the outside air treatment air conditioner 10 through the first supply air duct 20. By this, even when a part of the odor contained in the odor exhaust EA2 flows into the supply air SA2 in the total heat exchange element 41 of the total heat exchanger 40, the supply air SA2 containing the odor is diffused and diluted by the supply air SA1 that has merged from the second supply air duct 50 into the first supply air duct 20 and passed through the total heat exchange element 11 of the outside air treatment air conditioner 10, and then is introduced from the first supply air duct 20 into the tenant exclusive area R1. Therefore, the deterioration of the comfort of the tenant exclusive area R1 due to the introduction of the supply air SA2 containing the odor is suppressed.

[0030] Furthermore, the supply air SA2 after passing through the total heat exchange element 41 of the total heat exchanger 40 is introduced into the tenant exclusive area R1 instead of the toilet R2, and only the exhaust through the odor exhaust duct 60 is performed for the toilet R2. Therefore, the air volume of the supply air SA2 in the total heat exchange element 41 of the total heat exchanger 40 can be increased to an air volume capable of sufficiently recovering heat from the odor exhaust EA2, and the toilet R2 can be maintained at a negative pressure compared to the corridor R3 and the tenant exclusive area R1. Then, the indoor air RA1 of the tenant exclusive area R1 flows into the corridor R3 through the ventilation port 71, and the indoor air RA3 of the corridor R3 flows into the toilet R2 through the ventilation port 72, so that an air current of the indoor air RA1 and RA3 from the tenant exclusive area R1 side to the toilet R2 side is generated, and the odor of the toilet R2 is prevented from flowing out to the corridor R3 and the tenant exclusive area R1 side against the air current.

[0031] In the first air supply duct 20, the confluence point 25 of the second air supply duct 50 is located upstream of the air supply fan 22 for passing the air supply SA1 through the first air supply duct 20. Thus, even without providing a dedicated air supply fan for the second air supply duct 50, the air supply SA2 can flow through the second air supply duct 50 where the total heat exchange element 41 of the total heat exchanger 40 is provided, solely by the blowing power of the air supply fan 22 for passing the air supply SA1 through the first air supply duct 20. Furthermore, since the air supply SA2 containing odors that merges from the second air supply duct 50 into the first air supply duct 20 necessarily passes through the air supply fan 22, the air supply SA2 is diffused better and then introduced into the tenant exclusive area R1.

[0032] Furthermore, in the first air supply duct 20, the confluence point 25 of the second air supply duct 50 is located downstream of the total heat exchange element 11 of the outdoor air treatment air conditioner 10. Thus, the air supply SA2 that merges from the second air supply duct 50 into the first air supply duct 20 after passing through the total heat exchange element 41 of the total heat exchanger 40 is introduced into the tenant exclusive area R1 without passing through the total heat exchange element 11 of the outdoor air treatment air conditioner 10. Then, although the air supply volume (the set air supply volume of VAV29) from the first air supply duct 20 to the tenant exclusive area R1 increases due to the confluence of the air supply SA2 from the second air supply duct 50 into the first air supply duct 20 compared to the case without such confluence, the air supply volume (the set air supply volume of VAV27) in the total heat exchange element 11 of the outdoor air treatment air conditioner 10 is suppressed to an air volume suitable for total heat exchange with the general exhaust EA1 without being increased. Therefore, an increase in the size of the total heat exchange element 11 of the outdoor air treatment air conditioner 10 due to the confluence of the air supply SA2 from the second air supply duct 50 into the first air supply duct 20 is avoided.

[0033] Furthermore, in the first air supply duct 20, the confluence point 25 of the second air supply duct 50 is located upstream of the temperature control section 23. Thus, since all of the air supplies SA1 and SA2 that merge at the confluence point 25 are temperature-controlled by the temperature control section 23 and then introduced into the tenant exclusive area R1, the comfort of the tenant exclusive area R1 is improved.

[0034] This system 100 is configured to change the operating mode among a first operating mode (Figure 1), a second operating mode (Figure 2), and a third operating mode (Figure 3) according to the outside air load for bringing the outside air taken into the room closer to the indoor temperature and humidity. Explanations will be added below for each operating mode. In addition, in Figures 1, 2, and 3, the air ducts in the ventilated state are represented by thick lines, and the air ducts in the non-ventilated state are represented by thin lines. Also, in Figures 1, 2, and 3, the closed damper 55 is represented by being painted black, and the open damper 55 is represented by being white.

[0035] (First Operating Mode) The first operating mode shown in Figure 1 is the operating mode when there is a requirement for mechanical ventilation during a period when there is an outside air load. In this first operating mode, all fans 22, 35, and 65 are operated, and the damper 55 is opened. Then, the indoor air RA1 in the tenant exclusive part R1 is forcibly exhausted outdoors O by the general exhaust fan 35 through the general exhaust air duct 30 as the general exhaust EA1, and the indoor air RA2 in the toilet R2 is forcibly exhausted outdoors O by the odor exhaust fan 65 through the odor exhaust air duct 60 as the odor exhaust EA2. At the same time, the outside air OA is introduced into the tenant exclusive part R1 forcibly by the supply fan 22 after recovering the heat of the general exhaust EA1 in the total heat exchange element 11 through the first supply air duct 20 as the supply air SA1. Also, the outside air OA is introduced into the first supply air duct 20 forcibly by the supply fan 22 after recovering the heat of the odor exhaust EA2 in the total heat exchange element 41 through the second supply air duct 50 as the supply air SA2, and after being merged into the supply air SA1, diffused and diluted, it is introduced into the tenant exclusive part R1 from the first supply air duct 20.

[0036] Here, in the total heat exchange element 11, the supply air volume of the supply air SA1 is set to be approximately the same as the exhaust air volume of the general exhaust EA1, and in the total heat exchange element 41, the supply air volume of the supply air SA2 is set to be approximately the same as the exhaust air volume of the odor exhaust EA2. On the other hand, the supply air volume from the first supply air duct 20 to the tenant exclusive area R1 (the set supply air volume of the VAV 29) is set to be larger than the exhaust air volume of the general exhaust EA1 from the tenant exclusive area R1 by the exhaust air volume of the odor exhaust EA2 from the toilet R2. From this, when the indoor air RA1 of the tenant exclusive area R1 flows into the corridor R3 through the ventilation opening 71, and the indoor air RA3 of the corridor R3 flows into the toilet R2 through the ventilation opening 72, an air current of the indoor air RA1 and RA3 from the tenant exclusive area R1 side to the toilet R2 side is generated, preventing the odor of the toilet R2 from flowing back to the corridor R3 and the tenant exclusive area R1 side.

[0037] And in this first operation mode, so-called mechanical ventilation can be performed, in which both the general exhaust EA1 and the odor exhaust EA2 are forcibly exhausted to the outdoors O while forcibly supplying the corresponding supply air SA1 and SA2 to the indoors R. At the same time, the supply air SA1 and SA2 obtained by recovering heat from both the general exhaust EA1 and the odor exhaust EA2 are appropriately temperature-controlled by the temperature control unit 23 and then introduced into the tenant exclusive area R1 at a relatively high air volume, enabling it to cope with a relatively large ventilation volume.

[0038] (Second operation mode) The second operation mode shown in FIG. 2 is an operation mode when there is a requirement for mechanical ventilation during a period without an outdoor air load such as in the intermediate period. In this second operation mode, all the fans 22, 35, and 65 are operated, and the damper 55 is closed. Then, the indoor air RA1 in the tenant exclusive area R1 is forcibly discharged outdoors O as general exhaust EA1 by the general exhaust fan 35 through the general exhaust air duct 30. At the same time, the indoor air RA2 in the toilet R2 is forcibly discharged outdoors O as odor exhaust EA2 by the odor exhaust fan 65 through the odor exhaust air duct 60. At the same time, the outside air OA is forcibly introduced into the tenant exclusive area R1 as supply air SA1 by the supply air fan 22 through the first supply air duct 20. On the other hand, since the damper 55 is closed, the confluence of the supply air SA2 from the second supply air duct 50 into the first supply air duct 20 does not occur. Therefore, the supply air SA1 introduced from the first supply air duct 20 into the tenant exclusive area R1 is completely prevented from being mixed with odors due to the confluence of the supply air SA2.

[0039] In this second operation mode, since there is no outside air load, heat recovery from the odor exhaust EA2 by total heat exchange with the supply air SA2 in the total heat exchanger 40 becomes unnecessary. Therefore, the intake of the outside air OA (supply air SA2) in the total heat exchanger 40 is stopped. On the other hand, also in the outside air treatment air conditioner 10, heat recovery from the general exhaust EA1 by total heat exchange with the supply air SA1 becomes unnecessary. Therefore, by stopping the rotational operation of the rotary type total heat exchange element 11, the total heat exchange between the supply air SA1 and the general exhaust EA1 is stopped. Incidentally, as another method of stopping the total heat exchange between the supply air SA1 and the general exhaust EA1 in the outside air treatment air conditioner 10, a bypass air duct (not shown) that bypasses the total heat exchange element 11 may be provided in each of the first supply air duct 20 and the general exhaust air duct 30, and the supply air SA1 and the general exhaust EA1 may be passed through the bypass air duct to bypass the total heat exchange element 11.

[0040] Here, the exhaust air volume of the odor exhaust EA2 from the toilet R2 is set to be approximately the same as the exhaust air volume of the odor exhaust EA2 in the first operation mode. However, the exhaust air volume of the general exhaust EA1 from the tenant exclusive area R1 is set to be less than the exhaust air volume of the general exhaust EA1 in the first operation mode. On the one hand, the supply air volume from the first supply air duct 20 to the tenant exclusive area R1 (the set supply air volume of VAV29) is set to be larger than the exhaust air volume of the general exhaust EA1 from the tenant exclusive area R1 by the exhaust air volume of the odor exhaust EA2 from the toilet R2. From this, when the indoor air RA1 of the tenant exclusive area R1 flows into the corridor R3 through the ventilation opening 71, and the indoor air RA3 of the corridor R3 flows into the toilet R2 through the ventilation opening 72, an air current of the indoor air RA1 and RA3 from the tenant exclusive area R1 side to the toilet R2 side is generated, preventing the odor of the toilet R2 from flowing back to the corridor R3 and the tenant exclusive area R1 side. However, since the supply air SA2 from the second supply air duct 50 does not merge into the first supply air duct 20, in order to maintain the supply air volume from the first supply air duct 20 to the tenant exclusive area R1 (the set supply air volume of VAV29) equivalent to that in the first operation mode, the supply air volume taken into the outdoor air treatment air conditioner 10 (the set supply air volume of VAV27) is increased compared to the first operation mode.

[0041] And in this second operation mode, a so-called mechanical ventilation can be performed in which both the general exhaust EA1 and the odor exhaust EA2 are forcibly exhausted to the outdoors O while forcibly supplying supply air SA1 corresponding to it to the indoors R. At the same time, the outdoor air OA close to the indoor temperature is taken in as the supply air SA1 with a relatively high air volume, and after appropriately temperature-adjusting the supply air SA1 by the temperature adjustment unit 23, it is introduced into the tenant exclusive area R1, enabling rational response to a relatively large ventilation volume while saving energy.

[0042] (Third operation mode) The third operation mode shown in FIG. 3 is an operation mode when there is no requirement for mechanical ventilation during a period without outdoor air load such as in the intermediate period. In this third operation mode, only the odor exhaust fan 65 is operated and the damper 55 is closed in order to discharge only the odor of the toilet R2 to the outdoors O. Also, the ventilation window 73 is opened to supply the outdoor air OA to the tenant exclusive area R1 naturally. Then, the indoor air RA2 in the toilet R2 is discharged to the outdoors O as the odor exhaust EA2 through the odor exhaust air duct 60. At the same time, the outside air OA is naturally supplied to the tenant exclusive area R1 from the opened ventilation window 73. Here, the exhaust air volume of the odor exhaust EA2 from the toilet R2 is set to be approximately the same as the exhaust air volume of the odor exhaust EA2 in the above first operation mode. In this way, the indoor air RA1 in the tenant exclusive area R1 flows into the corridor R3 through the ventilation opening 71, and the indoor air RA3 in the corridor R3 flows into the toilet R2 through the ventilation opening 72. In this form, an air current of the indoor air RA1, RA3 from the tenant exclusive area R1 side to the toilet R2 side is generated, and the odor in the toilet R2 is prevented from flowing back to the corridor R3 and the tenant exclusive area R1 side. And in this third operation mode, while forcibly exhausting the odor exhaust EA2 to the outdoors O, the corresponding outside air OA can be naturally supplied to the tenant exclusive area R1.

[0043] 〔Alternative Embodiment〕 Another embodiment of the present invention will be described. Note that the configurations of each embodiment described below are not limited to being applied alone, and can also be applied in combination with the configurations of other embodiments.

[0044] (1) In the above embodiment, the general room is the tenant exclusive area R1, and the odor generating room is the toilet R2. However, rooms other than the tenant exclusive area R1 and the toilet R2 may be used as the general room or the odor generating room.

[0045] (2) In the above embodiment, the outside air OA taken in from the outdoors O is introduced into the indoor area R as the supply air SA1, SA2. However, as long as the supply air SA1, SA2 is introduced into the indoor area R, for example, the indoor air taken out from the indoor area R may be refluxed as the return air to the outside air OA taken in from the outdoors O and then introduced into the indoor area R as the supply air SA1, SA2.

[0046] (3) In the above-described embodiment, in the first air supply duct 20, the confluence point 25 of the second air supply duct 50 is arranged at a position upstream of the air supply fan 22 and the temperature control unit 23 and downstream of the total heat exchange element 11. However, the position of the confluence point 25 of the second air supply duct 50 in the first air supply duct 20 can be appropriately changed.

Explanation of Signs

[0047] 11 Total heat exchange element (total heat exchange section for general exhaust air) 20 First air supply duct 22 Air supply fan 25 Confluence point 41 Total heat exchange element (total heat exchange section for odor exhaust air) 50 Second air supply duct 100 Ventilation system EA1 General exhaust air EA2 Odor exhaust air R Indoor R1 Tenant exclusive area (general room) R2 Toilet (odor generating room) SA1 Air supply SA2 Air supply

Claims

1. A total heat exchanger for general exhaust air that performs total heat exchange between general exhaust air taken out from a general room and supply air taken into the room, A ventilation system comprising: a total heat exchanger for odor exhaust air that performs total heat exchange between odor exhaust air taken out from an odor generating room separate from the general room and supply air taken into the room, A first supply air duct through which the supply air passing through the total heat exchanger for general exhaust air flows is provided to introduce the supply air into the general room, A ventilation system in which a second supply air duct through which the supply air passing through the total heat exchanger for odor exhaust air flows is provided to merge the supply air into the first supply air duct.

2. The ventilation system according to claim 1, wherein in the first supply air duct, the merging portion of the second supply air duct is located upstream of a supply air fan for allowing the supply air to flow through the first supply air duct.

3. The ventilation system according to claim 1 or 2, wherein in the first supply air duct, the merging portion of the second supply air duct is located downstream of the total heat exchanger for general exhaust air.

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