JP2020003099A - Air conditioning system - Google Patents

Abstract

To improve efficiency of air conditioning that efficiently uses a latent heat treatment part and a sensible heat treatment part by properly switching a bypass state between a return air bypass state and an outer air bypass state.SOLUTION: An air conditioning system includes: a bypass passage 33 capable of communicating an upstream side of a latent heat treatment unit 12 in an outer air side air channel 11 with an upstream side of a sensible heat treatment unit 22 in a return air side air channel 21; a bypass air volume adjusting unit 34 disposed in the bypass passage 33; a ventilation resistance adjusting unit 35 disposed on the downstream side in the air circulation direction of the bypass passage 33 in a casing 2 capable of adjusting a relative relationship between ventilation resistance to the sensible heat treatment unit 22 and ventilation resistance to the latent heat treatment unit 12; and a bypass state switching control unit 41 for controlling operations of the bypass air volume adjusting unit 34 and the ventilation resistance adjusting unit 35, and switching the bypass state between an outer air bypass state for introducing part of outer air to the return air side air channel 21 through the bypass passage 33 and a return air bypass state for introducing part of return air to the outer air side air channel 11 through the bypass passage 33.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air conditioning system provided with a latent heat treatment unit capable of processing latent heat of ventilation air and a sensible heat treatment unit capable of processing sensible heat of ventilation air.

  In this air conditioning system, an outside air passage for taking in outside air and a return air passage for taking in return air from a space to be air-conditioned are provided, and the latent heat treatment unit reduces the latent heat of the ventilation air in the outside air passage. The sensible heat treatment unit processes the sensible heat of the ventilation air in the return air passage. A common fan was provided to allow the outside air to flow through the latent heat treatment section and the return air to the sensible heat treatment section, and was subjected to sensible heat treatment in the outside air after the latent heat treatment in the latent heat treatment section and in the sensible heat treatment section. The air is mixed with the return air to be supplied to the air-conditioned space (for example, see Patent Documents 1 and 2).

  In the systems described in Patent Literatures 1 and 2, an external air passage in which a latent heat treatment unit is disposed, a return air passage in which a sensible heat treatment unit is disposed, and a common fan are provided in a casing. .

  In such an air conditioning system, an external air bypass state in which part of the outside air taken into the outside air side air path is introduced into the return air side air path through the bypass path depending on the condition of the latent heat load and the sensible heat load of the space to be air conditioned. In addition, it is desired to switch a part of the return air taken into the return air side air passage into a return air bypass state in which the air is introduced into the outside air side air passage through a bypass passage.

  Therefore, the system described in Patent Literature 1 includes a bypass state switching control unit that can switch between an outside air bypass state and a return air bypass state. In the system described in Patent Literature 1, a bypass path is provided in the casing that allows communication between the upstream side of the latent heat treatment section in the outside air side air path and the upstream side of the sensible heat treatment section in the return air side air path, The bypass path is provided with a first adjustment damper and a second adjustment damper capable of adjusting the amount of bypass air in the bypass path. Outside the casing, an outside air duct communicating with the outside air passage in the casing and a return air duct communicating with the return air passage in the casing are provided, and the outside air duct has an outside air passage in the casing. The return air duct is provided with an outside air damper capable of adjusting the amount of outside air flowing into the casing, and the return air duct is provided with a return air damper capable of adjusting the amount of ventilation of the return air to the return air side air passage in the casing. The bypass state switching control unit is configured to be able to switch between the outside air bypass state and the return air bypass state by controlling the operation of the first adjustment damper, the second adjustment damper, the outside air damper, and the return air damper.

  Further, the system described in Patent Literature 2 includes a bypass state switching control unit that can switch only to the return air bypass state between the outside air bypass state and the return air bypass state. In the system described in Patent Document 2, the first air passage communicating with the outside air passage, the second air passage communicating with the return air passage, the first air passage and the second air passage, And a bypass path capable of communicating with An outside air adjustment damper capable of adjusting the amount of outside air flow is provided upstream of the communication point of the bypass in the first air passage, and downstream of the communication point of the bypass in the second air passage. In addition, a return air adjustment damper capable of adjusting the flow rate of return air is provided, and the bypass path is provided with a mixing adjustment damper capable of adjusting the bypass air flow rate in the bypass path. The bypass state switching control unit is configured to control the operation of the mixing adjustment damper so as to switch to the return air bypass state.

JP-A-2001-082763 JP-A-2005-059692

  In the system described in Patent Document 1, the bypass state switching control unit adjusts the first adjustment damper and the second adjustment damper to an appropriate intermediate opening, and adjusts the return air damper and the outside air damper to a predetermined opening. By setting the wind pressure flowing from the return air duct to the return air passage in the casing to be smaller than the wind pressure flowing from the outside air duct to the outside air passage in the casing, an outside air bypass state is realized. Further, the bypass state switching control unit adjusts the first adjustment damper to an appropriate intermediate opening, fully opens the second adjustment damper, adjusts the return air damper and the outside air damper to a predetermined opening, and controls the return air duct from the return air duct. By setting the wind pressure flowing into the return air passage in the casing to be higher than the wind pressure flowing from the outside air duct into the outside air passage in the casing, a return air bypass state is realized.

  As described above, in the system described in Patent Document 1, the relative relationship between the wind pressure flowing from the outside air duct to the outside air passage in the casing and the wind pressure flowing from the return air duct to the return air passage in the casing (large or small) By adjusting the relationship, the air conditioner is switched between the outside air bypass state and the return air bypass state.

  However, if there is a difference between the ventilation resistance to the latent heat treatment part and the ventilation resistance to the sensible heat treatment part due to the arrangement and specifications (pressure loss) of the latent heat treatment part and the sensible heat treatment part, the presence of a filter, etc. It may not be possible to properly switch to the return air bypass state.

  For example, an outside air filter is arranged upstream of the latent heat treatment section of the outside air passage, and a return air filter is often arranged upstream of the sensible heat treatment section of the return air passage. Generally, the outside air filter is configured by a filter having a higher collection rate and a larger pressure loss than the return air filter. Therefore, the ventilation resistance to the latent heat treatment unit in the outside air passage tends to be larger than the ventilation resistance to the sensible heat treatment unit in the return air passage.

  Therefore, when switching to the return air bypass state, even if the wind pressure flowing from the return air duct to the return air passage in the casing is larger than the wind pressure flowing from the outside air duct to the outside air passage in the casing, The return air bypass path, which introduces return air from the return air path to the outside air path through the bypass path only when the amount of ventilation to the sensible heat treatment section of the return air path with low ventilation resistance is increased, is appropriate. However, even if it does, the control of the bypass airflow cannot be performed precisely.

  Further, in the system described in Patent Literature 1, since the return air damper and the outside air damper for switching the bypass state are provided outside the casing, it is difficult to assemble them in advance, and work at the system construction site is difficult. The trouble is increased.

  In the system described in Patent Document 2, it is possible to switch to the return air bypass state, but not to the outside air bypass state. Therefore, since it is not possible to take an air conditioning pattern that allows a part of the outside air to flow through the sensible heat treatment unit, it is not possible to respond to a request to switch to the outside air bypass state, and the air conditioning using the latent heat treatment unit and the sensible heat treatment unit efficiently. Efficiency cannot be achieved sufficiently.

  Further, in the system described in Patent Document 2, when the outside air adjustment damper, the return air adjustment damper, and the mixing adjustment damper are provided outside the casing, it is difficult to assemble them in advance, and the work at the system construction site is difficult. The trouble is increased.

  In view of this situation, the main problem of the present invention is to appropriately switch between the return air bypass state and the outside air bypass state while reducing the labor required at the system construction site, and to set the latent heat treatment unit and the sensible heat treatment unit An object of the present invention is to provide an air-conditioning system capable of improving the efficiency of air-conditioning efficiently used.

A first characteristic configuration of the present invention is provided inside a casing, and an outside air passage through which outside air is taken;
A return-air-side air passage provided in the casing and into which return air is taken;
A latent heat treatment unit arranged in the outside air side air passage and capable of processing latent heat of ventilation air,
A sensible heat treatment unit disposed in the return air side air passage and capable of processing sensible heat of the ventilation air,
The outside air and the return air are taken into the outside air passage and the return air passage, and the taken outside air and the return air are passed through the latent heat treatment unit and the sensible heat treatment unit, and then mixed and supplied to the air-conditioned space. Common fans possible,
Provided in the casing, a bypass path that can communicate with the upstream side of the latent heat treatment section in the outside air side air path and the upstream side of the sensible heat treatment section in the return air side air path,
A bypass air volume adjusting unit that is arranged on the bypass path and that can adjust a bypass air volume;
A ventilation resistance adjustment unit that is disposed downstream of the bypass passage in the air flow direction in the casing and that can adjust a relative relationship between ventilation resistance to the sensible heat treatment unit and ventilation resistance to the latent heat treatment unit; ,
An external air bypass state for controlling the operation of the bypass air volume adjustment unit and the ventilation resistance adjustment unit, and introducing a part of the outside air taken into the outside air side air passage to the return air side air passage through the bypass passage. A bypass state switching control unit capable of switching between a return air bypass state in which a part of the return air taken into the return air side air path is introduced into the outside air side air path through the bypass path. It is in.

  According to this configuration, the bypass state switching control unit can switch to the outside air bypass state or the return air bypass state according to the state of the sensible heat load or the latent heat load, and the excessive indoor temperature drop or excessive indoor humidity Ascent can be prevented.

  When the bypass state switching control unit switches to the outside air bypass state or the return air bypass state, the ventilation resistance adjustment unit adjusts the relative relationship between the ventilation resistance to the sensible heat treatment unit and the ventilation resistance to the latent heat treatment unit, and the outside air bypass state. And a return air bypass state can be realized. Therefore, even if there is a difference between the ventilation resistance to the latent heat treatment part and the ventilation resistance to the sensible heat treatment part due to the arrangement and specifications (pressure loss) of the latent heat treatment part and the sensible heat treatment part, the presence of a filter, etc. By appropriately adjusting the relative relationship between the ventilation resistance and the ventilation resistance to the latent heat treatment section, the outside air bypass state and the return air bypass state can be appropriately exhibited.

  For example, the bypass state switching control unit allows the bypass air volume adjustment unit to allow air to pass through the bypass passage, and the ventilation resistance adjustment unit allows the ventilation resistance to the latent heat treatment unit to be greater than the ventilation resistance to the sensible heat treatment unit. By adjusting to, the outside air bypass state can appear. In addition, the bypass state switching control unit allows the bypass air volume adjustment unit to allow air to pass through the bypass passage, and the ventilation resistance adjustment unit allows the ventilation resistance to the sensible heat treatment unit to be larger than the ventilation resistance to the latent heat treatment unit. By adjusting to, the return air bypass state can appear.

  As described above, by appropriately switching between the return air bypass state and the outside air bypass state, it is possible to improve the efficiency of air conditioning by efficiently using the latent heat treatment unit and the sensible heat treatment unit. Further, by providing the bypass air volume adjusting unit and the ventilation resistance adjusting unit in the casing before the carry-in to the system construction site, it is possible to reduce the labor required for the system construction site.

A second characteristic configuration of the present invention is that the ventilation resistance adjustment unit is disposed downstream of a communication point of the bypass passage in the return air passage in the casing and adjusts a ventilation amount of the sensible heat treatment unit. A possible first air volume adjuster is provided,
The bypass state switching control unit operates at least the bypass air volume adjustment unit so that air can be passed through the bypass passage, and the ventilation resistance to the sensible heat treatment unit is smaller than the ventilation resistance to the latent heat treatment unit. The present invention is characterized in that the first air volume adjusting unit is operated so as to increase the size, and the return air bypass state appears.

  According to this configuration, even when the ventilation resistance to the latent heat treatment section is greater than the ventilation resistance to the sensible heat treatment section due to the arrangement and specifications (pressure loss) of the latent heat treatment section and the sensible heat treatment section, the presence of a filter, etc. The switching control unit activates at least the bypass air volume adjusting unit so that air can be passed through the bypass passage, and the first air volume such that the ventilation resistance to the sensible heat treatment unit is greater than the ventilation resistance to the latent heat treatment unit. By operating the adjustment unit (reducing the air volume), a part of the return air can be appropriately supplied to the latent heat treatment unit side, and the return air bypass state can be appropriately manifested.

  Further, when the ventilation resistance to the latent heat treatment section is larger than the ventilation resistance to the sensible heat treatment section, at least by operating the bypass air volume adjustment section so as to allow ventilation through the bypass passage, the latent heat treatment section By utilizing the magnitude relationship between the ventilation resistance and the ventilation resistance to the sensible heat treatment unit, a part of the outside air can be supplied to the sensible heat treatment unit side, and the outside air bypass state can be efficiently exhibited.

A third characteristic configuration of the present invention is that the ventilation resistance adjustment unit is disposed downstream of a communication point of the bypass passage in the outside air passage in the casing and adjusts a ventilation amount of the latent heat treatment unit. A second air volume adjusting unit is further provided;
The bypass state switching control unit activates the bypass air volume adjustment unit so that air can pass through the bypass passage, and the ventilation resistance to the latent heat treatment unit is larger than the ventilation resistance to the sensible heat treatment unit. Activating the first air volume adjusting unit and the second air volume adjusting unit to cause the outside air bypass state to appear, and operating the bypass air volume adjusting unit so that air can be passed through the bypass passage; and The first air volume adjustment unit and the second air volume adjustment unit are operated so that the ventilation resistance to the heat treatment unit is greater than the ventilation resistance to the latent heat treatment unit, and the return air bypass state appears. .

  According to this configuration, the bypass state switching control unit includes the bypass air volume adjustment unit arranged in the bypass air passage, the first air volume adjustment unit arranged in the return air passage, and the second air volume adjustment unit arranged in the outside air passage. By controlling the operation of the three members of the air volume adjustment section, not only can the air volume be properly switched to the outside air bypass state or the return air bypass state, but also the air volume adjustment when switching to the outside air bypass state or the return air bypass state is accurately performed. be able to.

A fourth characteristic configuration of the present invention is an outside air-side filter disposed downstream of a communication point of the bypass path in the outside air-side air path,
A return-air-side filter disposed downstream of the communication point of the bypass in the return-air-side air path,
The point is that the outside air side filter is constituted by a filter having a higher collection rate and a larger pressure loss than the return air side filter.

  According to this configuration, the outside air filter disposed in the outside air passage and the return air filter disposed in the return air passage allow the air flowing through the outside air passage and the return air passage to pass through. Dust and the like can be collected. In particular, since the outside air filter is constituted by a filter having a higher collection rate and a larger pressure loss than the return air filter, dust and the like can be appropriately collected from the outside air having a large amount of dust.

  When switching to the return air bypass state, the bypass state switching control unit activates at least the bypass air volume adjustment unit so that air can be passed through the bypass passage, and the ventilation resistance to the sensible heat treatment unit reduces the latent heat treatment. By operating the first air volume adjusting unit so as to be larger than the ventilation resistance to the air passage, a latent heat treatment having a large ventilation resistance due to the presence of the outside air filter having a higher collection rate and a large pressure loss than the return air filter. A part of the return air can be appropriately supplied to the side of the section, and the return air bypass state can be appropriately manifested.

  In a fifth characteristic configuration of the present invention, the bypass state switching control unit acquires the sensible heat load and the latent heat load of the air-conditioned space, and enters the outside air bypass state when the acquired sensible heat load of the air-conditioned space becomes lower than or equal to a lower limit. The point is to switch to the return air bypass state when the switched and acquired latent heat load of the air-conditioned space exceeds the upper limit.

  According to this configuration, when the acquired sensible heat load of the air-conditioned space is equal to or less than the lower limit, the bypass state switching control unit causes the outside air that introduces part of the outside air taken into the outside air-side air passage to the return air-side air passage. By switching to the bypass state, the amount of sensible heat treatment (excessive sensible heat treatment accompanying latent heat treatment) by the latent heat treatment unit arranged in the outside air passage can be suppressed, and an appropriate sensible heat load can be adjusted.

  Also, when the latent heat load of the acquired air conditioning target space is equal to or more than the upper limit, the bypass state switching control unit sets the return air bypass state in which a part of the return air taken into the return air path is introduced into the outside air path. By switching, the latent heat treatment amount (cooling dehumidification amount) by the latent heat treatment unit arranged in the outside air side air passage can be increased and adjusted to an appropriate latent heat load.

Diagram showing the overall outline of the air conditioning system The figure which shows the whole air conditioning system outline when switched to an outside air bypass state Diagram showing the overall outline of the air conditioning system when switching to the return air bypass state Flow chart showing the operation of the air conditioning system Flowchart showing operation in bypass control The figure which shows the whole air conditioning system outline in another embodiment.

An embodiment of an air conditioning system according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the air-conditioning system 100 includes a casing 2 in which various devices for air-conditioning a space 1 to be air-conditioned, such as a living room of a building, and a plurality of ducts 3 to 5 connected to the casing 2. An operation control unit 40 for controlling the operation of the air conditioning system 100 is provided. As ducts 3 to 5 connected to the casing 2, an outside air duct 3 that can supply outside air OA into the casing 2, a return air duct 4 that can supply return air RA from the air-conditioned space 1 into the casing 2, An air supply duct 5 that can supply air conditioned in the casing 2 to the air-conditioned space 1 as air supply SA is provided.

  The casing 2 is provided with an outside air side air passage 11 for taking in outside air OA from the outside air duct 3 and a return air side passage 21 for taking in return air RA from the return air duct 4. A partition 2a is provided in the casing 2, and the partition 2a defines an outside air passage 11 and a return air passage 21 in the casing 2. A latent heat treatment unit 12 capable of processing the latent heat of the ventilation air is arranged in the outside air passage 11, and a sensible heat treatment unit 22 capable of treating the sensible heat of the ventilation air is arranged in the return air passage 21. I have. The latent heat treatment section 12 is connected to a latent heat side circulation supply path 13 that circulates and supplies a heat medium (for example, cold water) from a heat source (not shown). Is provided with a latent heat side adjusting valve 14 capable of adjusting the circulating supply amount of the heat medium. The sensible heat treatment section 22 is also connected to a sensible heat side circulation supply path 23 that circulates a heat medium (for example, cold water) from a heat source (not shown). A sensible heat side adjustment valve 24 capable of adjusting the circulating supply amount of the heat medium to 22 is provided.

  In the casing 2, in addition to the outside air passage 11 and the return air passage 21, outside air OA and return air RA are taken into the outside air passage 11 and the return air passage 21, and the taken outside air OA and A common fan 31 is provided, which allows the return air RA to flow to the latent heat treatment unit 12 and the sensible heat treatment unit 22 and then mix and supply the mixed air to the air-conditioned space 1. By operating the common fan 31, outside air OA is taken into the outside air passage 11 through the outside air duct 3, the taken outside air OA is passed through the latent heat treatment section 12, and the return air duct is passed through the return air duct 4. The return air RA is taken into 21 and the taken return air RA is passed through the sensible heat treatment section 22. The outside air OA subjected to the latent heat treatment (cooling and dehumidification treatment) in the latent heat treatment unit 12 and the return air RA subjected to the sensible heat treatment (cooling treatment) in the sensible heat treatment unit 22 were mixed in the mixing space 32 in the casing 2. Thereafter, a mixture of the outside air OA and the return air RA is supplied to the air-conditioned space 1 through the air supply duct 5 as the air supply SA.

  Inside the casing 2, the upstream side of the latent heat treatment section 12 in the outside air side air path 11 in the air flow direction and the upstream side of the sensible heat treatment section 22 in the return air side air path 21 in the air flow direction can be communicated. A simple bypass path 33 is provided. The bypass passage 33 is configured to allow communication between the upstream end of the outside air passage 11 and the upstream end of the return air passage 21 in the air flow direction. In the bypass passage 33, a bypass air volume adjusting unit 34 capable of adjusting the bypass air volume is disposed. The bypass air volume adjustment unit 34 is configured by, for example, an opening adjustment valve that can adjust the bypass air volume by adjusting the opening.

  The outside air filter 11 is disposed in the outside air passage 11 on the downstream side in the air flow direction from the communication point of the bypass passage 33, and the return air passage 21 is provided with more air than the communication point of the bypass passage 33. A return air filter 25 is disposed downstream of the flow direction. Dust and the like contained in the outside air OA passed through the latent heat treatment unit 12 are removed by the outside air filter 15, and dust and the like contained in the return air RA passed through the sensible heat treatment unit 22 are removed by the return air filter 25. Have been. Between the outside air side filter 15 and the return air side filter 25, the outside air side filter 15 is configured by a filter having a higher collection rate and a larger pressure loss than the return air side filter 25.

  Ventilation resistance adjustment that is arranged in the casing 2 downstream of the bypass passage 33 in the air flow direction and that can adjust the relative relationship between the ventilation resistance to the latent heat treatment unit 12 and the ventilation resistance to the sensible heat treatment unit 22. A part 35 is provided. As the ventilation resistance adjustment unit 35, a first air volume adjustment unit 26 that can adjust the air volume of the sensible heat treatment unit 22 and a second air volume adjustment unit 16 that can adjust the air volume of the latent heat treatment unit 12 are provided. The first air volume adjustment unit 26 and the second air volume adjustment unit 16 are configured by, for example, an opening degree adjustment valve capable of adjusting a ventilation amount by adjusting an opening degree. The first air volume adjustment unit 26 is disposed downstream of the communication point of the bypass passage 33 in the return air side air channel 21 in the air flow direction, and is configured to be capable of adjusting the ventilation resistance to the sensible heat treatment unit 22. . The second air volume adjustment unit 16 is arranged downstream of the communication point of the bypass passage 33 in the outside air side air channel 11 in the ventilation direction, and is configured to be capable of adjusting the ventilation resistance to the latent heat treatment unit 12.

  In this manner, in the outside air side air passage 11, from the upstream side in the air flow direction, the outside air side filter 15, the second air volume adjustment unit 16, and the latent heat treatment unit 12 are arranged in this order. The return air filter 21, the first air volume adjustment unit 26, and the sensible heat treatment unit 22 are arranged in the return air path 21 in this order from the upstream side in the air flow direction.

  The operation control unit 40 is configured to control the operation of the air conditioning system 100 by controlling the operation states of the common fan 31, the latent heat side adjustment valve 14, the sensible heat side adjustment valve 24, and the like. When a remote controller (not shown) is operated by a user or the like, the operation control unit 40 controls the operation of the air conditioning system 100 in accordance with the operation of the remote controller.

  When the remote controller is turned ON, the operation control unit 40 operates the common fan 31 to open the latent heat side adjustment valve 14 and the sensible heat side adjustment valve 24 to the set opening degree, and the air conditioning system 100 Is turned ON. When turning on the air-conditioning system 100, the operation control unit 40 sets the bypass air volume adjustment unit 34 to the fully closed state, and sets the first air volume adjustment unit 26 and the second air volume adjustment unit 16 to the fully open state. By this ON operation, as shown in FIG. 1, outside air OA is taken into the outside air passage 11 through the outside air duct 3, and the taken outside air OA is passed through the latent heat treatment section 12 to perform latent heat treatment (cooling and dehumidification processing). The return air RA is taken into the return air passage 21 through the return air duct 4, and the taken return air RA is passed through the sensible heat treatment section 22 for sensible heat treatment (cooling treatment). The outside air OA subjected to the latent heat treatment (cooling and dehumidification treatment) in the latent heat treatment unit 12 and the return air RA subjected to the sensible heat treatment (cooling treatment) in the sensible heat treatment unit 22 were mixed in the mixing space 32 in the casing 2. Thereafter, a mixture of the outside air OA and the return air RA is supplied to the air-conditioned space 1 through the air supply duct 5 as the air supply SA.

  The air-conditioned space 1 is provided with a humidity sensor 6 for detecting a latent heat load of the air-conditioned space 1 and a temperature sensor 7 for detecting a sensible heat load of the air-conditioned space 1. The operation control unit 40 controls the common fan 31, the latent heat side adjustment valve 14, and the sensible heat side adjustment valve 24 so that the humidity detected by the humidity sensor 6 becomes the set humidity and the temperature detected by the temperature sensor 7 becomes the set temperature. And other operating states. The user can set the set humidity and the set temperature using a remote controller or the like.

  As shown in FIG. 2, the operation control unit 40 includes an outside air bypass state in which a part of the outside air OA taken into the outside air side air path 11 is introduced into the return air side air path 21 through the bypass path 33. As shown in FIG. 7, a bypass state switching control unit 41 capable of switching a part of the return air RA taken into the return air path 21 to the return air bypass state in which the return air RA is introduced into the outside air path 11 through the bypass path 33. Is provided.

  The bypass state switching control unit 41 controls the operation of the bypass air volume adjustment unit 34, the first air volume adjustment unit 26, and the second air volume adjustment unit 16, and controls the outside air bypass state (see FIG. 2) and the return air bypass state (see FIG. 2). 3). Incidentally, in FIGS. 1 to 3, the open / closed states of the bypass air volume adjustment unit 34, the first air volume adjustment unit 26, and the second air volume adjustment unit 16 are shown by white outlines, which are open and closed. Some are shown in black.

  When the bypass state switching control unit 41 switches to the outside air bypass state, when the ventilation resistance to the sensible heat treatment unit 22 becomes larger than the ventilation resistance to the latent heat treatment unit 12, the outside air OA is appropriately introduced into the return air passage 21. Cannot be properly switched to the outside air bypass state. Further, when the bypass state switching control unit switches to the return air bypass state, if the ventilation resistance to the latent heat treatment unit 12 becomes larger than the ventilation resistance to the sensible heat treatment unit 22, the return air RA is appropriately supplied to the outside air side air passage 11. It cannot be introduced and cannot be properly switched to the return air bypass state.

  Therefore, the bypass state switching control unit 41 not only controls the operation of the bypass air volume adjustment unit 34 but also controls the operation of the first air volume adjustment unit 26 and the second air volume adjustment unit 16, so that the ventilation to the sensible heat treatment unit 22 is performed. The relative relationship between the resistance and the ventilation resistance to the latent heat treatment unit 12 is adjusted to switch between the outside air bypass state and the return air bypass state.

A case of switching to the outside air bypass state will be described based on FIG.
The bypass state switching control unit 41 not only operates the bypass air volume adjustment unit 34 so that air can be passed through the bypass passage 33, but also has a ventilation resistance to the latent heat treatment unit 12 larger than a ventilation resistance to the sensible heat treatment unit 22. By operating the first air volume adjustment unit 26 and the second air volume adjustment unit 16 so as to achieve the outside air bypass state. The bypass state switching control unit 41 operates, for example, the bypass air volume adjusting unit 34 to a fully open state, and opens the first air volume adjusting unit 26 and the second air volume adjusting unit 16 to the opening degree for outside air bypass. Let me. As described above, the bypass state switching control unit 41 opens the first air volume adjustment unit 26 and the second air volume adjustment unit 16 to the opening degree for outside air bypass, thereby reducing the ventilation resistance to the latent heat treatment unit 12 by the sensible heat treatment. It becomes larger than the ventilation resistance to the part 22, and a part of the outside air OA can be appropriately introduced into the return air passage 21, so that it is possible to appropriately switch to the outside air bypass state.

The outside air bypass setting opening will be described.
When the pressure loss in the outside air filter 15 is larger than the pressure loss in the return air filter 25, the ventilation resistance to the latent heat treatment unit 12 tends to be larger than the ventilation resistance to the sensible heat treatment unit 22. When the pressure loss in the latent heat treatment unit 12 is larger than the pressure loss in the sensible heat treatment unit 22, the ventilation resistance to the latent heat treatment unit 12 tends to be larger than the ventilation resistance to the sensible heat treatment unit 22. . As described above, the magnitude relationship between the ventilation resistance to the latent heat treatment unit 12 and the ventilation resistance to the sensible heat treatment unit 22 is determined by the magnitude relationship between the pressure loss in the outside air filter 15 and the pressure loss in the return air filter 25, In addition, the pressure loss in the latent heat treatment section 12 and the pressure loss in the sensible heat treatment section 22 have a certain relationship with each other.

  Therefore, the set opening degree for the outside air bypass is determined by the magnitude relation between the pressure loss in the outside air filter 15 and the pressure loss in the return air filter 25, and the pressure loss in the latent heat treatment section 12 and the sensible heat treatment section 22. Based on the magnitude relationship with the pressure loss, experiments and the like are set in advance so that the ventilation resistance to the latent heat treatment section 12 is larger than the ventilation resistance to the sensible heat treatment section 22. As the outside air bypass setting opening, a setting opening for the first air volume adjustment unit 26 and a setting opening for the second air volume adjustment unit 16 are set.

  Incidentally, the set opening degree for outside air bypass is not only set to a fixed opening degree, but also in accordance with, for example, a change in a magnitude relationship between a pressure loss in the latent heat treatment section 12 and a pressure loss in the sensible heat treatment section 22. It is also possible to change and set.

  In the outside air bypass state, as shown in FIG. 2, part of the outside air OA taken into the outside air side air passage 11 is introduced into the return air side air passage 21 through the bypass passage 33, and the introduced outside air OA and the return air The return air RA taken into the air-side air passage 21 is mixed with the return air RA and is passed through the sensible heat treatment unit 22. The rest of the outside air OA taken into the outside air passage 11 is passed through the latent heat treatment unit 12. A mixture of the outside air OA subjected to the latent heat treatment (cooling and dehumidifying treatment) in the latent heat treatment unit 12 and the outside air OA subjected to the sensible heat treatment (cooling treatment) in the sensible heat treatment unit 22 and the return air RA is mixed in the casing 2. After being mixed in the space 32, it is supplied to the air-conditioned space 1 through the air supply duct 5 as air supply SA.

  The bypass state switching control unit 41 controls the opening degree of each of the bypass air volume adjustment unit 34, the first air volume adjustment unit 26, and the second air volume adjustment unit 16 in the state where the air conditioner is switched to the outside air bypass state, so that the latent heat is controlled. The airflow to the processing unit 12 and the airflow to the sensible heat treatment unit 22 are adjustable. For example, when the room temperature, which is the temperature detected by the temperature sensor 7 in the air-conditioned space 1, is lower than the set temperature, the bypass state switching control unit 41 sets the opening of the first air volume adjustment unit 26 to the outside air bypass setting opening. The latent heat treatment unit is configured to perform at least one of the control of adjusting the opening degree of the second air flow rate adjusting unit 16 to the opening side and the control of adjusting the opening degree of the second air volume adjusting unit 16 to the closing side of the outside air bypass setting opening degree. It is possible to reduce the amount of airflow to the sensible heat treatment unit 22 and to reduce the amount of airflow to the sensible heat treatment unit 22.

The case of switching to the return air bypass state will be described based on FIG.
The bypass state switching control unit 41 not only operates the bypass air volume adjustment unit 34 so that air can be passed through the bypass passage 33, but also has a ventilation resistance to the sensible heat treatment unit 22 larger than a ventilation resistance to the latent heat treatment unit 12. By operating the first air volume adjusting unit 26 and the second air volume adjusting unit 16 so as to achieve the return air bypass state. The bypass state switching control unit 41, for example, activates the bypass air volume adjustment unit 34 to the fully open state, and opens the opening of the first air volume adjustment unit 26 and the second air volume adjustment unit 16 to the set opening for return air bypass. It is working. As described above, the bypass state switching control unit 41 opens the first air volume adjustment unit 26 and the second air volume adjustment unit 16 to the opening degree for return air bypass, so that the ventilation resistance to the sensible heat treatment unit 22 becomes latent heat. It becomes larger than the ventilation resistance to the processing unit 12, and a part of the return air RA can be appropriately introduced into the outside air side air passage 11, so that the air can be appropriately switched to the return air bypass state.

  About the set opening for return air bypass, similarly to the set opening for outside air bypass, the magnitude relationship between the pressure loss in the outside air filter 15 and the pressure loss in the return air filter 25 and the latent heat treatment unit 12 Based on the magnitude relationship between the pressure loss of the sensible heat treatment unit 22 and the pressure loss of the sensible heat treatment unit 22, it is preset by experiments or the like such that the ventilation resistance to the sensible heat treatment unit 22 is larger than the ventilation resistance to the latent heat treatment unit 12. ing. As the set opening for the return air bypass state, a set opening for the first air flow adjusting unit 26 and a set opening for the second air flow adjusting unit 16 are set.

  In the return air bypass state, as shown in FIG. 3, a part of the return air RA taken into the return air passage 21 is introduced into the outside air passage 11 through the bypass passage 33, and the introduced return air RA and the outside air OA taken into the outside air side air passage 11 are mixed and are passed through the latent heat treatment unit 12. The mixture of the outside air OA and the return air RA subjected to the latent heat treatment (cooling and dehumidification processing) in the latent heat treatment unit 12 and the return air RA subjected to the sensible heat treatment (cooling treatment) in the sensible heat treatment unit 22 are contained in the casing 2. After being mixed in the mixing space 32, the air is supplied to the air-conditioned space 1 through the air supply duct 5 as air supply SA.

  The bypass state switching control unit 41 controls the opening degree of each of the bypass air volume adjustment unit 34, the first air volume adjustment unit 26, and the second air volume adjustment unit 16 in the state where the air conditioner is switched to the return air bypass state, The amount of ventilation to the latent heat treatment unit 12 and the amount of ventilation to the sensible heat treatment unit 22 are adjustable. For example, when the indoor humidity which is the detection humidity of the humidity sensor 6 of the air-conditioned space 1 is higher than the set humidity, or when the indoor temperature which is the detected temperature of the temperature sensor 7 of the air-conditioned space 1 is higher than the set temperature, The bypass state switching control unit 41 controls the opening of the first air volume adjusting unit 26 to be closer to the closing side than the set opening for return air bypass, and the opening of the second air volume adjusting unit 16 for the return air bypass. By performing at least one of the controls for adjusting the opening to the opening side from the set opening, the amount of air flow to the latent heat treatment unit 12 can be increased and the amount of air flow to the sensible heat treatment unit 22 can be reduced. .

  Hereinafter, the operation of the air conditioning system 100 will be described based on the flowcharts of FIGS. 4 and 5. FIG. 5 is a flowchart showing the operation in the “bypass control” of step # 4 in FIG.

  The user sets a target set temperature and a set humidity as targets of the air-conditioning state of the air-conditioned space 1 using a remote controller or the like (step # 1). The operation control unit 40 measures the latent heat load of the air-conditioned space 1 based on the deviation between the detected humidity of the humidity sensor 6 and the set humidity, and the like, and measures the latent heat load of the air-conditioned space 1 based on the deviation between the detected temperature of the temperature sensor 7 and the set temperature. Is measured (step # 2).

  The operation control unit 40 determines whether or not the bypass condition is satisfied using the measured latent heat load and sensible heat load (step # 3). When the bypass condition is satisfied, the operation control unit 40 performs bypass control (in the case of Yes in Step # 3, Step # 4).

  The bypass condition is set according to the state of the latent heat load and the sensible heat load in the space 1 to be air-conditioned. One of three conditions: a condition in which the sensible heat load of the air-conditioned space 1 is equal to or less than the lower limit, a condition in which the latent heat load of the air-conditioned space 1 is equal to or more than the upper limit, and a condition in which the sensible heat load of the air-conditioned space 1 is equal to or more than the upper limit Is satisfied, the bypass condition is set to be satisfied. When the room temperature detected by the temperature sensor 7 is equal to or lower than the lower limit of temperature, the sensible heat load of the air-conditioned space 1 is equal to or lower than the lower limit. When the room humidity, which is the humidity detected by the humidity sensor 6, is equal to or higher than the upper humidity limit, the latent heat load of the air-conditioned space 1 is equal to or higher than the upper limit. When the room temperature detected by the temperature sensor 7 is equal to or higher than the upper temperature limit, the sensible heat load of the air-conditioned space 1 is equal to or higher than the upper limit. The lower temperature limit can be set to a temperature lower than the set temperature by a lower set temperature (for example, 4 ° C.). The humidity upper limit can be set to a humidity higher than the set humidity by the upper limit set humidity (for example, 20%). The temperature upper limit can be set to a temperature higher than the set temperature by the upper limit set temperature (for example, 3 ° C.).

  When the bypass condition is not satisfied, the operation control unit 40 is in the non-bypass state (if No in Step # 3, Step # 5). The operation control unit 40 closes the bypass air volume adjustment unit 34 and fully opens the first air volume adjustment unit 26 and the second air volume adjustment unit 16, thereby controlling the ventilation of the air passing through the bypass passage 33. It is in a non-bypass state that is not performed.

  The operation control unit 40 controls the common fan 31, the latent heat side adjustment valve 14, and the sensible heat side adjustment valve 24 so that the humidity detected by the humidity sensor 6 becomes the set humidity and the temperature detected by the temperature sensor 7 becomes the set temperature. Is performed (step # 6).

The bypass control will be described based on FIG.
First, the bypass state switching control unit 41 of the operation control unit 40 determines whether the sensible heat load of the air-conditioned space 1 is equal to or lower than the lower limit. If the room temperature detected by the temperature sensor 7 is equal to or lower than the lower limit of temperature, the bypass state switching controller 41 determines that the sensible heat load of the air-conditioned space 1 is equal to or lower than the lower limit and switches to the outside air bypass state (step # 11). If No, step # 12). The bypass state switching control unit 41 maintains the state of switching to the outside air bypass state until the room temperature, which is the temperature detected by the temperature sensor 7, becomes higher than the set temperature (Yes in Step # 13).

  In the outside air bypass state, as shown in FIG. 2, part of the outside air OA taken into the outside air side air passage 11 is introduced into the return air side air passage 21 through the bypass passage 33, so that the latent heat The ventilation amount decreases, and the ventilation amount to the sensible heat treatment unit 22 increases. As a result, the temperature of the supply air SA supplied to the air-conditioned space 1 increases, and the indoor temperature of the air-conditioned space 1 can be increased. Therefore, even if the sensible heat load of the air-conditioned space 1 is equal to or lower than the lower limit, the indoor temperature of the air-conditioned space 1 can be higher than the set temperature by the bypass state switching control unit 41 switching to the outside air bypass state. .

  As described above, in the state where the air conditioner is switched to the outside air bypass state, the bypass state switching control unit 41 performs the bypass air volume adjustment unit 34 and the first air volume based on the relationship between the set temperature and the room temperature detected by the temperature sensor 7. By controlling the degree of opening in each of the adjustment unit 26 and the second air volume adjustment unit 16, it is possible to adjust the air volume to the latent heat treatment unit 12 and the air volume to the sensible heat treatment unit 22.

  Returning to FIG. 5, next, the bypass state switching control unit 41 determines whether or not the latent heat load of the air-conditioned space 1 is equal to or more than the upper limit. In the case of Yes in step # 11 and in the case of No in step # 13, if the indoor humidity, which is the detected humidity of the humidity sensor 6, is equal to or higher than the upper humidity limit, it is determined that the latent heat load of the air-conditioned space 1 is equal to or higher than the upper limit. Then, the bypass state switching control unit 41 switches to the return air bypass state (if No in Step # 14, Step # 15). The bypass state switching control unit 41 maintains the state of switching to the return air bypass state until the room humidity, which is the humidity detected by the humidity sensor 6, becomes lower than the set humidity (Yes in step # 16).

  In the return air bypass state, as shown in FIG. 3, a part of the return air RA taken into the return air passage 21 is introduced into the outside air passage 11 through the bypass passage 33. The ventilation amount to the latent heat treatment section 12 increases. As a result, the humidity of the supply air SA supplied to the air-conditioned space 1 decreases, and the indoor humidity of the air-conditioned space 1 can be reduced. Therefore, even if the latent heat load of the air-conditioned space 1 is equal to or higher than the upper limit, the indoor humidity of the air-conditioned space 1 can be made lower than the set humidity by the bypass state switching control unit 41 switching to the return air bypass state. .

  As described above, in the state where the return air bypass state has been switched, the bypass state switching control unit 41 determines whether the bypass air volume adjustment unit 34 and the first airflow amount adjustment unit 34 have the first humidity based on the relationship between the indoor humidity, which is the humidity detected by the humidity sensor 6, and the set humidity. By controlling the degree of opening in each of the air volume adjusting unit 26 and the second air volume adjusting unit 16, the air volume to the latent heat treatment unit 12 and the air volume to the sensible heat treatment unit 22 can be adjusted.

  Returning to FIG. 5, next, the bypass state switching control unit 41 determines whether the sensible heat load of the air-conditioned space 1 is equal to or more than the upper limit. In the case of Yes in step # 14 and in the case of No in step # 16, if the room temperature detected by the temperature sensor 7 is equal to or higher than the upper temperature limit, the sensible heat load of the air-conditioned space 1 is equal to or higher than the upper limit. As a result, the bypass state switching control unit 41 switches to the return air bypass state (if No in Step # 17, Step # 18). The bypass state switching control unit 41 maintains the state of switching to the return air bypass state until the room temperature, which is the temperature detected by the temperature sensor 7, becomes lower than the set temperature (Yes in Step # 19).

  In the return air bypass state, as shown in FIG. 3, a part of the return air RA taken into the return air passage 21 is introduced into the outside air passage 11 through the bypass passage 33. The ventilation amount to the latent heat treatment section 12 increases. As a result, the temperature of the supply air SA supplied to the air-conditioned space 1 decreases, and the indoor temperature of the air-conditioned space 1 can be reduced. Therefore, even if the sensible heat load of the air-conditioned space 1 is equal to or more than the upper limit, the bypass state switching control unit 41 switches to the return air bypass state, so that the room temperature of the air-conditioned space 1 can be lower than the set temperature. it can.

  As described above, in the state where the air conditioner is switched to the return air bypass state, the bypass state switching control unit 41 determines whether the bypass air volume adjustment unit 34 and the first air temperature adjustment unit 34 have the first temperature based on the relationship between the room temperature detected by the temperature sensor 7 and the set temperature. By controlling the degree of opening in each of the air volume adjusting unit 26 and the second air volume adjusting unit 16, the air volume to the latent heat treatment unit 12 and the air volume to the sensible heat treatment unit 22 can be adjusted.

  In this way, in the bypass control, the bypass state switching control unit 41 switches between the outside air bypass state and the return air bypass state in accordance with the sensible heat load and the latent heat load of the air-conditioned space 1, thereby controlling the air-conditioning target. The indoor temperature of the space 1 can be set to the set temperature, and the indoor humidity of the air-conditioned space 1 can be set to the set humidity.

[Another embodiment]
Another embodiment of the present invention will be described. In addition, the configuration of each embodiment described below is not limited to being applied independently, and can be applied in combination with the configuration of another embodiment.
(1) In the above embodiment, as shown in FIG. 1, in order to supply a heat medium from a heat source to the latent heat treatment section 12 and the sensible heat treatment section 22, the latent heat side circulation supply path 13 and the sensible heat side circulation supply path 23 And the latent heat treatment unit 12 and the sensible heat treatment unit 22 are connected in parallel to the heat source.

  Instead of this, as shown in FIG. 6, the latent heat treatment unit 12 is set to the upstream side in the flow direction of the heat medium and the sensible heat treatment unit 22 is set to the downstream side in the flow direction of the heat medium with respect to the heat source. The processing unit 12 and the sensible heat treatment unit 22 can be connected in series. In this case, a common circulation supply path 36 for circulating and supplying a heat medium from the heat source to the latent heat treatment section 12 and the sensible heat treatment section 22 is provided. A common adjusting valve 37 is provided which can adjust the amount of the circulating supply of the heat medium to the heat treatment unit 12 and the sensible heat treatment unit 22.

(2) In the above embodiment, the first air volume adjustment unit 26 is disposed upstream of the sensible heat treatment unit 22 in the air flow direction in the return air channel 21, and the second air volume adjustment unit 16 In the side air passage 11, the air passage is disposed upstream of the latent heat treatment unit 12 in the air flow direction. Instead, the first air volume adjustment unit 26 is arranged downstream of the sensible heat treatment unit 22 in the air flow direction from the sensible heat treatment unit 22 in the return air passage 21, and is disposed in the outside air side air passage 11 more than the latent heat treatment unit 12. The second air volume adjustment unit 16 can be arranged downstream in the air flow direction.

(3) In the above embodiment, the example in which one common fan 31 is provided has been described, but a plurality of common fans 31 may be provided.

(4) In the above-described embodiment, the bypass air volume adjustment unit 34 is, for example, configured with an opening adjustment valve that can adjust the bypass air volume by adjusting the opening, but is not limited thereto. For example, the bypass air volume adjusting unit 34 can be configured with an on-off valve that can adjust the bypass air volume by switching between an open state and a closed state.

(5) In the above-described embodiment, the example in which the first air volume adjusting unit 26 and the second air volume adjusting unit 16 are provided as the ventilation resistance adjusting unit 35 has been described, but the first air volume adjusting unit 26 and the second air volume adjusting unit are provided. 16 can be provided.

  For example, from the magnitude relationship between the pressure loss in the outside air filter 15 and the pressure loss in the return air filter 25, and from the magnitude relationship between the pressure loss in the latent heat treatment unit 12 and the pressure loss in the sensible heat treatment unit 22, etc. If the ventilation resistance to the latent heat treatment unit 12 is greater than the ventilation resistance to the sensible heat treatment unit 22, the second air volume adjustment unit 16 can be omitted and only the first air volume adjustment unit 26 can be provided.

  Conversely, the magnitude relationship between the pressure loss in the outside air filter 15 and the pressure loss in the return air filter 25, and the magnitude relationship between the pressure loss in the latent heat treatment section 12 and the pressure loss in the sensible heat treatment section 22, etc. Therefore, when the ventilation resistance to the sensible heat treatment unit 22 is larger than the ventilation resistance to the latent heat treatment unit 12, the first air volume adjustment unit 26 can be omitted and only the second air volume adjustment unit 16 can be provided.

DESCRIPTION OF SYMBOLS 1 Air-conditioning target space 2 Casing 11 Outside air side passage 12 Latent heat treatment unit 15 Outside air side filter 16 Second air volume adjustment unit 21 Return air side air passage 22 Sensible heat treatment unit 25 Return air side filter 26 First air volume adjustment unit 31 Common fan 33 bypass passage 34 bypass air volume adjustment unit 35 ventilation resistance adjustment unit 41 bypass state switching control unit

Claims (5)

An outside air-side air passage provided in the casing and into which outside air is taken;
A return-air-side air passage provided in the casing and into which return air is taken;
A latent heat treatment unit arranged in the outside air side air passage and capable of processing latent heat of ventilation air,
A sensible heat treatment unit disposed in the return air side air passage and capable of processing sensible heat of the ventilation air,
The outside air and the return air are taken into the outside air passage and the return air passage, and the taken outside air and the return air are passed through the latent heat treatment unit and the sensible heat treatment unit, and then mixed and supplied to the air-conditioned space. Common fans possible,
A bypass path provided in the casing and upstream of the latent heat treatment section in the outside air side air path and capable of communicating with the upstream side of the sensible heat treatment section in the return air side air path,
A bypass air volume adjusting unit that is arranged on the bypass path and that can adjust a bypass air volume;
A ventilation resistance adjustment unit that is arranged downstream of the bypass in the air flow direction in the casing and that can adjust a relative relationship between ventilation resistance to the sensible heat treatment unit and ventilation resistance to the latent heat treatment unit; ,
An external air bypass state for controlling the operation of the bypass air volume adjustment unit and the ventilation resistance adjustment unit, and introducing a part of the outside air taken into the outside air side air passage to the return air side air passage through the bypass passage. An air conditioner provided with a bypass state switching control unit capable of switching between a return air bypass state in which a part of the return air taken into the return air side air path is introduced into the outside air side air path through the bypass air path; system. The airflow resistance adjustment unit includes a first airflow amount adjustment unit that is disposed downstream of a communication point of the bypass passage in the return airflow passage in the casing and that can adjust the airflow amount of the sensible heat treatment unit. And
The bypass state switching control unit operates at least the bypass air volume adjustment unit so that air can be passed through the bypass passage, and the ventilation resistance to the sensible heat treatment unit is smaller than the ventilation resistance to the latent heat treatment unit. The air conditioning system according to claim 1, wherein the first air volume adjustment unit is operated so as to increase the air volume, and the return air bypass state appears. The airflow resistance adjustment unit further includes a second airflow amount adjustment unit that is disposed downstream of the communication point of the bypass passage in the outside air passage in the casing and adjusts the airflow amount of the latent heat treatment unit. ,
The bypass state switching control unit activates the bypass air volume adjustment unit so that air can pass through the bypass passage, and the ventilation resistance to the latent heat treatment unit is larger than the ventilation resistance to the sensible heat treatment unit. Activating the first air volume adjusting unit and the second air volume adjusting unit to cause the outside air bypass state to appear, and operating the bypass air volume adjusting unit so that air can be passed through the bypass passage; and 3. The return air bypass state is activated by operating the first air volume adjustment unit and the second air volume adjustment unit such that the ventilation resistance to the heat treatment unit is greater than the ventilation resistance to the latent heat treatment unit. An air conditioning system according to claim 1. An outside air-side filter disposed downstream of a communication point of the bypass passage in the outside air-side air passage;
A return-air-side filter disposed downstream of the communication point of the bypass in the return-air-side air path,
The air conditioning system according to any one of claims 1 to 3, wherein the outside air filter is configured by a filter having a higher collection rate and a larger pressure loss than the return air filter.   The bypass state switching control unit acquires the sensible heat load and the latent heat load of the air-conditioned space, and switches to the outside air bypass state when the acquired sensible heat load of the air-conditioned space is equal to or lower than the lower limit, and acquires the acquired latent heat of the air-conditioned space. The air conditioning system according to any one of claims 1 to 4, wherein the air conditioner is switched to the return air bypass state when a load exceeds an upper limit.

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