JP2021105460A - Air conditioning system - Google Patents

Abstract

To acquire a desired air conditioning environment in an overall air conditioning target space while achieving energy saving.SOLUTION: An air conditioning system equipped with a refrigerant circuit 4 in which a plurality of indoor units 3 are connected to one outdoor unit 2, the indoor units 3 being configured so as to be switched into a plurality of operation states and execute air conditioning processing using a refrigerant supplied in the refrigerant circuit 4 in an operation state, includes: an air supply part 7 for supplying air conditioning air to an air conditioning target space 6; and an operation control part 9 for controlling operation states of the plurality of indoor units 3. The plurality of indoor units 3 are provided in the middle part of the air supply part 7. The air supply part 7 is configured so as to bring the air subjected to air conditioning processing in the plurality of indoor units 3 into air conditioning air, and supply the air conditioning air to the air conditioning target space 6. The operation control part 9 is configured so as to execute a mixed operation mode for switching the plurality of indoor units 3 into any one of the plurality of operation states in a state that the indoor units 3 with different operation states are mixed.SELECTED DRAWING: Figure 1

Description

The present invention relates to an air conditioning system provided with a refrigerant circuit in which a plurality of indoor units are connected to one outdoor unit.

In the above air conditioning system, a refrigerant circuit in which a plurality of indoor units are connected to one outdoor unit is provided, and air conditioning processing using a refrigerant can be performed in each of the plurality of indoor units.

The indoor unit is freely configured to switch between a cooling operation state in which cooling processing is performed using the refrigerant supplied in the refrigerant circuit and a heating operation state in which heat treatment is performed using the refrigerant supplied in the refrigerant circuit. ing. The operation control unit that controls the operation state of a plurality of indoor units is not only an operation mode for switching a plurality of indoor units to the same operation state, but also a form in which indoor units having different operation states are mixed. It is configured to be able to execute a mixed operation mode for switching to any of the operating states (see, for example, Patent Document 1).

In the system described in Patent Document 1, the operation control unit switches one indoor unit to the heating operation state and another indoor unit to the cooling operation state in the mixed operation mode, so that the heating operation state is obtained. The indoor unit of the above and the indoor unit in the cooling operation state are mixed. In this way, when indoor units with different operating states coexist, for example, the refrigerant acquires heat (cold heat) from the indoor unit in the heating operating state, and the refrigerant having that heat (cold heat) is in the cooling operating state. It is supplied to the indoor unit of the above, and air conditioning treatment (cooling treatment) is performed using the refrigerant. Therefore, it is possible to perform air conditioning treatment in each indoor unit while transferring heat between the indoor unit in the heating operation state and the indoor unit in the cooling operation state through the refrigerant in the refrigerant circuit, which saves energy. Can be planned.

Japanese Patent No. 5309717

However, in the system described in Patent Document 1, since a plurality of indoor units are provided in the air-conditioned space, individual air-conditioned air is individually supplied from each of the plurality of indoor units to the air-conditioned space. .. Therefore, in the mixed operation mode, the individually air-conditioned air individually supplied from each of the plurality of indoor units has different air-conditioning states such as temperature and humidity, so that it is difficult to obtain a desired air-conditioned environment in the entire air-conditioned space. It has become.

For example, a heating effect can be obtained near an indoor unit in a heating operating state, but it is difficult to obtain a cooling effect. Conversely, a cooling effect can be obtained near an indoor unit in a cooling operating state, but heating is obtained. Difficult to get the effect.

In view of this situation, a main object of the present invention is to provide an air conditioning system capable of obtaining a desired air conditioning environment in the entire air conditioning target space while saving energy.

The first characteristic configuration of the present invention includes a refrigerant circuit in which a plurality of indoor units are connected to one outdoor unit.
In an air-conditioning system in which the indoor unit can be switched to a plurality of operating states and can freely perform air-conditioning processing using the refrigerant supplied by the refrigerant circuit in the operating state.
An air supply unit that supplies air-conditioned air to the air-conditioned space,
It is provided with an operation control unit that controls the operation state of the plurality of indoor units.
The plurality of indoor units are provided in an intermediate portion of the air supply unit.
The air supply unit is configured to use air that has been air-conditioned by the plurality of indoor units as air-conditioned air and supply the air-conditioned air to the air-conditioned space.
The operation control unit is configured to be capable of executing a mixed operation mode in which a plurality of indoor units are switched to any of a plurality of operating states in a form in which indoor units having different operating states are mixed.

According to this configuration, the operation control unit can execute a mixed operation mode in which a plurality of indoor units are switched to any of a plurality of operating states in a form in which indoor units having different operating states are mixed. Therefore, for example, heating An indoor unit in a heating operating state for processing and an indoor unit in a cooling operating state for cooling processing can be mixed. As a result, it is possible to perform air conditioning treatment in each indoor unit while transferring heat between the indoor unit in the heating operation state and the indoor unit in the cooling operation state through the refrigerant in the refrigerant circuit, which saves energy. Can be planned.

Since the air supply unit uses air that has been air-conditioned by a plurality of indoor units as air-conditioned air and supplies the air-conditioned air to the air-conditioned space, the operating state differs in the middle part of the air-conditioning unit in the mixed operation mode. Air conditioning is performed in each of the indoor units to generate air-conditioned air, and the generated air-conditioned air is supplied to the air-conditioned space. As a result, air-conditioned air adjusted to a desired air-conditioned state is supplied to the air-conditioned space, so that a desired air-conditioned environment can be appropriately obtained in the air-conditioned space.

The second characteristic configuration of the present invention is that the air supply unit is provided with two indoor units.
In the mixed operation mode, the operation control unit switches to a cooling operation state in which one indoor unit is cooled as an air conditioning treatment, and the other indoor unit is heat-treated as an air conditioning treatment. The point is to switch to the state.

According to this configuration, in the mixed operation mode, the operation control unit switches one of the two indoor units to the cooling operation state and the other indoor unit to the heating operation state. Therefore, it is possible to generate and supply conditioned air that has been subjected to both cooling treatment and heat treatment to the air-conditioned space. For example, by cooling and dehumidifying the air by the cooling treatment and heating the air by the heat treatment, the conditioned air that has been cooled and dehumidified to a desired temperature and a desired humidity can be supplied to the conditioned space. Therefore, by combining the cooling treatment and the heat treatment, it is possible to obtain a desired air-conditioned environment not only for the temperature but also for the humidity, and it is possible to improve the comfort of the air-conditioned space.

In the third characteristic configuration of the present invention, the air supply unit is provided with two indoor units in series in the air flow direction.
In the mixed operation mode, the operation control unit switches the indoor unit located on the upstream side in the air flow direction to a cooling operation state in which the indoor unit is cooled as an air conditioning process, and is on the downstream side in the air flow direction. The point is to switch the indoor unit located in the above to a heating operation state in which heat treatment is performed as air conditioning treatment.

According to this configuration, the air supply unit is provided with two indoor units in series in the air flow direction. Therefore, as the air supply unit, the air from the indoor unit on the upstream side is supplied to the downstream side. It suffices to provide a configuration that only supplies the indoor unit of the above, and the configuration can be simplified. Moreover, in the mixed operation mode, the air can be cooled and dehumidified to a desired humidity by first cooling the indoor unit in the cooling operation state in the air supply unit, and then in the heating operation state. By heat-treating in the indoor unit, the cooled and dehumidified air can be heated to a desired temperature. As a result, conditioned air adjusted to a desired temperature and desired humidity can be supplied to the conditioned space, and cooling and dehumidification can be performed so that a desired conditioned environment can be obtained in the conditioned space.

In the fourth characteristic configuration of the present invention, the air supply unit is provided with two indoor units in parallel in the air flow direction.
The air supply unit is obtained by mixing a branch portion that branches and supplies air to the indoor unit on one side and the indoor unit on the other side, and air from the indoor unit on one side and air from the indoor unit on the other side. The point is that it is equipped with a mixing section for conditioned air.

According to this configuration, the air supply unit is air-conditioned by mixing air from two indoor units provided in parallel with a branch portion for branching and supplying air to each of the two indoor units provided in parallel. Since it is equipped with a mixing unit that generates air, even when two indoor units are provided in parallel, each of the two indoor units generates air-conditioned air and supplies it to the air-conditioned space. And the air-conditioned air can be appropriately supplied to the air-conditioned space.

In the fifth characteristic configuration of the present invention, the operation control unit is set as an operation mode.
The mixed operation mode and
A ventilation operation mode in which both of the two indoor units are switched to a ventilation operation state in which air is blown without air conditioning.
Of the two indoor units, the first cooling operation mode in which one indoor unit is switched to the ventilation operation state and the other indoor unit is switched to the cooling operation state.
The point is that any operation mode of the second cooling operation mode for switching both of the two indoor units to the cooling operation state can be freely executed.

According to this configuration, the operation control unit can execute not only the mixed operation mode but also a plurality of operation modes of the blower operation mode, the first cooling operation mode, and the second cooling operation mode. It is possible to execute the operation mode according to the above. As a result, it is possible to obtain an air-conditioned environment that meets the needs of the user and the like, and it is possible to flexibly respond to the needs of the user and the like.

The sixth characteristic configuration of the present invention is that the operation control unit is configured to select and execute any of a plurality of operation modes according to the load condition of the air-conditioned space.

According to this configuration, the operation control unit automatically selects and executes the operation mode according to the load status of the air-conditioned space from among the plurality of operation modes. Therefore, the operation control unit automatically selects and executes the operation mode according to the load status in the air-conditioned space. A desired air-conditioned environment can be easily and appropriately obtained.

The figure which shows the schematic structure of the air conditioning system The figure which shows the outline of the refrigerant circuit of an air conditioning system. Flowchart showing operation in dehumidifying and reheating operation mode Flow chart showing operation in the first cooling operation mode Flow chart showing operation in the second cooling operation mode The figure which shows the schematic structure of the air conditioning system in 2nd Embodiment

An embodiment of the air conditioning system according to the present invention will be described with reference to the drawings.
[First Embodiment]
As shown in FIG. 1, the air conditioning system 1 includes an outdoor unit 2, an indoor unit 3, and a refrigerant circuit 4, and a plurality of indoor units 3 are connected to one outdoor unit 2 by the refrigerant circuit 4. ing. Incidentally, in FIG. 1, in order to show a state in which a plurality of indoor units 3 are mainly connected to one outdoor unit 2, the switching unit 5 and some refrigerant passages are omitted, and the refrigerant circuit is omitted. 4 is schematically shown.

As shown in FIG. 2, the outdoor unit 2 includes a compressor 21, an outdoor three-way valve 22, an outdoor heat exchanger 23, an outdoor fan 24, an outdoor expansion valve 25, and an outdoor on-off valve 26. In the refrigerant circuit 4, the outdoor unit 2 connects the first refrigerant passage 41 that connects the outside of the outdoor unit 2 and the suction side of the compressor 21, and the discharge side of the compressor 21 and the outdoor heat exchanger 23. The second refrigerant passage 42, the third refrigerant passage 43 connecting the outdoor heat exchanger 23 and the outside of the outdoor unit 2, and the intermediate portion of the first refrigerant passage 41 and the intermediate portion of the second refrigerant passage 42 are connected. A fourth refrigerant passage 44 and a fifth refrigerant passage 45 connecting an intermediate portion of the second refrigerant passage 42 and the outside of the outdoor unit 2 are provided.

The outdoor three-way valve 22 is arranged at a connection point with the fourth refrigerant passage 44 in the middle portion of the second refrigerant passage 42. The outdoor three-way valve 22 connects the discharge side of the compressor 21 and the outdoor heat exchanger 23 to cause the outdoor heat exchanger 23 to function as a condenser (see the solid line in FIG. 2) and the compressor 21. It is configured to be switchable to an evaporation state (see the dotted line in FIG. 2) in which the suction side and the outdoor heat exchanger 23 are connected so that the outdoor heat exchanger 23 functions as an evaporator.

The outdoor expansion valve 25 is arranged in the middle of the third refrigerant passage 43. The fifth refrigerant passage 45 is branched and connected from between the outdoor three-way valve 22 and the compressor 21 at an intermediate portion of the second refrigerant passage 42. The outdoor on-off valve 26 is arranged in the middle of the fifth refrigerant passage 45, and stops the supply state of supplying the refrigerant discharged from the compressor 21 to the outside through the fifth refrigerant passage 45 and the supply of the refrigerant to the outside thereof. It is configured to be switchable to the supply stop state. By setting the outdoor on-off valve 26 to the supply state, a part of the refrigerant discharged from the compressor 21 can be freely supplied to the outside through the fifth refrigerant passage 45.

As shown in FIG. 2, the indoor unit 3 includes an indoor heat exchanger 31, an indoor fan 32, and an indoor expansion valve 33. The indoor unit 3 is configured so that the air conditioning process can be freely executed by the indoor heat exchanger 31 using the refrigerant supplied by the refrigerant circuit 4 with respect to the supplied air. In the indoor unit 3, as an operating state, the indoor heat exchanger 31 functions as an evaporator to cool the supplied air, and the indoor heat exchanger 31 functions as a condenser. It is configured to be switchable to a plurality of operating states such as a heating operating state in which the supplied air is heat-treated.

In the indoor unit 3, the third refrigerant passage 43 is connected to the indoor heat exchanger 31, and the indoor expansion valve 33 is arranged in the middle of the third refrigerant passage 43. Since a plurality of indoor units 3 are provided, the plurality of indoor heat exchangers 31 in the plurality of indoor units 3 are connected in parallel to the third refrigerant passage 43.

The indoor unit 3 is connected to the refrigerant circuit 4 via a switching unit 5 that can switch the flow state of the refrigerant, and is provided with a sixth refrigerant passage 46 that connects the indoor heat exchanger 31 and the switching unit 5. .. Since a plurality of indoor units 3 are provided, the plurality of indoor units 3 are connected to the refrigerant circuit 4 in parallel via the plurality of switching units 5. The switching unit 5 can be provided not only separately from the indoor unit 3 but also integrally with the indoor unit 3.

The switching unit 5 includes a seventh refrigerant passage 47 connected to the first refrigerant passage 41 and an eighth refrigerant passage 48 connected to the fifth refrigerant passage 45, and the seventh refrigerant passage 47 and the eighth refrigerant. A switching three-way valve 51 is provided at a connection point with the road 48. The switching three-way valve 51 is in a cooling state in which the first refrigerant passage 41 and the sixth refrigerant passage 46 are connected via the seventh refrigerant passage 47 to cause the indoor heat exchanger 31 to function as an evaporator (switching on the left side in FIG. 2). A heated state (see the right side in FIG. 2) in which the unit 5) is connected to the fifth refrigerant passage 45 and the sixth refrigerant passage 46 via the eighth refrigerant passage 48 to cause the indoor heat exchanger 31 to function as a condenser (right side in FIG. 2). It is configured to be switchable with the switching unit 5).

As shown in FIG. 1, the air conditioning system 1 is provided with an air supply unit 7 that supplies air conditioning air to the air conditioning target space 6, and a plurality of indoor units 3 are arranged in an intermediate portion of the air supply unit 7. .. As a result, the air supply unit 7 uses the air that has been air-conditioned by the plurality of indoor units 3 as air-conditioned air, and supplies the air-conditioned air to the air-conditioned space 6.

The air supply unit 7 is provided with a first chamber unit 3a on the upstream side and a second chamber unit 3b on the downstream side in series in the air flow direction, and the first chamber unit 3a and the second chamber unit 3b are provided in series. A humidifier 8 is arranged between the two.

The air conditioning system 1 has an air intake path 71 for taking in air (a mixture of outside air and return air or only outside air) to the first chamber unit 3a as a flow path for passing air, and a first chamber unit. The air supply path 72 that supplies the air from the second chamber unit 3b to the second chamber unit 3b, the air supply passage 73 that supplies the air from the second chamber unit 3b to the air conditioning target space 6, and the air in the air conditioning target space 6 are returned. A return air passage 74 that returns the air to an intermediate portion of the air intake passage 71 is provided.

The air supply unit 7 is composed of an air intake path 71, an inter-unit supply path 72, an air supply path 73, and the like. In the air conditioning system 1, the air supply unit 7 supplies the air-conditioned mixture of the outside air and the return air in the order of the first room unit 3a and the second room unit 3b to perform air conditioning processing, and the air conditioning air after the air conditioning processing is subject to air conditioning. It supplies space 6.

Regarding the installation locations of the plurality of indoor units 3, for example, the first indoor unit 3a and the second indoor unit 3b can be installed side by side in the attic space or the underfloor space of the air-conditioned space 6. Further, for example, the first chamber unit 3a and the second chamber unit 3b can be installed side by side in a machine room or the like adjacent to the air-conditioned space 6.

As shown in FIG. 1, the air conditioning system 1 is provided with an operation control unit 9 that controls the operation of the system. The operation control unit 9 controls switching of the operating state of the outdoor unit 2, the plurality of indoor units 3, the plurality of switching units 5, etc., and also controls the operating state of the outdoor unit 2 and the indoor unit 3 switched to each operating state. It is configured to do.

Regarding the switching of the operating state of the indoor unit 3, as described above, each of the plurality of indoor units 3 is configured to be freely switchable between the cooling operating state and the heating operating state as the operating state. The operation control unit 9 switches the indoor unit 3 to the cooling operation state by operating the indoor fan 32 to switch the switching three-way valve 51 to the cooling state (see the first indoor unit 3a on the left side in FIG. 2). There is. Further, the operation control unit 9 activates the indoor fan 32 to switch the switching three-way valve 51 to the heating state (see the second indoor unit 3b on the right side in FIG. 2), thereby putting the indoor unit 3 into the heating operation state. I'm switching.

Each of the plurality of indoor units 3 is in an operating state, in addition to a cooling operating state and a heating operating state, in a blowing operating state in which air is blown without heat exchange in the indoor heat exchanger 31. It is configured to be switchable. The operation control unit 9 blows the indoor unit 3 by operating the indoor fan 32 in a state where the flow of the refrigerant to the indoor heat exchanger 31 is stopped by the indoor expansion valve 33, the switching three-way valve 51, or the like. Switching to the operating state.

Regarding the operating state in each operating state of the indoor unit 3, the operation control unit 9 sets a set temperature that is a target of the supply air temperature of the air supplied from the indoor unit 3 for each of the plurality of indoor units 3, and supplies the air. After controlling the rotation speed of the indoor fan 32 and the opening degree of the indoor expansion valve 33 in the indoor unit 3 so that the air temperature becomes the set temperature, the rotation speed of the indoor fan 32 and the opening degree of the indoor expansion valve 33, etc. By changing the temperature, the air conditioning capacity of the indoor unit 3 can be changed.

Regarding the switching of the operating state of the outdoor unit 2, the operation control unit 9 can switch the outdoor unit 2 to the heating priority operating state by switching the outdoor three-way valve 22 to the condensed state (see the solid line in FIG. 2). By switching the outdoor three-way valve 22 to the evaporation state (see the dotted line in FIG. 2), the outdoor unit 2 can be freely switched to the cooling priority operation state. For example, in a plurality of indoor units 3, when the number of indoor units 3 to be switched to the heating operation state is large, the operation control unit 9 switches the outdoor unit 2 to the heating priority operation state, and conversely, the cooling operation state. When the number of indoor units 3 to be switched to is large, the operation control unit 9 can switch the outdoor unit 2 to the cooling priority operation state.

Regarding the operating state of the outdoor unit 2 in each operating state, the rotation speed of the outdoor fan 24 and the outdoor expansion valve 25 so that the operation control unit 9 brings the refrigerant into a desired state by heat exchange in the outdoor heat exchanger 23. The opening degree and the like are controlled. Regarding the outdoor on-off valve 26, when the operation control unit 9 has an indoor unit 3 for switching to the heating operation state, the indoor unit 3 switches the outdoor on-off valve 26 to the open state and switches to the heating operation state. If it does not exist, the outdoor on-off valve 26 is closed.

The air-conditioning system 1 is configured to be feasible to perform a cooling operation for cooling the air-conditioning target space 6 in summer, an intermediate period, or the like, and a heating operation for heating the air-conditioning target space 6 in winter or the like. First, the cooling operation will be described. As an operation mode in which the operation control unit 9 switches the operation state of the plurality of indoor units 3 to a predetermined operation state, a blower operation mode, a dehumidification reheat operation mode, a first cooling operation mode, and a first It is configured so that any operation mode of the two cooling operation modes can be freely executed.

(Blower operation mode)
In the ventilation operation mode, the operation control unit 9 switches the first chamber unit 3a and the second chamber unit 3b to the ventilation operation state. As a result, as shown in FIG. 1, air is taken into the first chamber unit 3a by the air intake passage 71, and the air blown by the first chamber unit 3a is blown by the inter-unit supply passage 72 to the second chamber unit 3b. The second chamber unit 3b is blown. In this way, the air in which the first chamber unit 3a and the second chamber unit 3b are sequentially blown is supplied as air conditioning air to the air conditioning target space 6 through the air supply passage 73.

In the blower operation mode, the operation control unit 9 determines the rotation speed of the indoor fan 32 of the first room unit 3a and the second room unit 3b regarding the operating state of the first room unit 3a and the second room unit 3b in the blower operation state. By controlling the rotation speed of the indoor fan 32 to a predetermined rotation speed, the ventilation capacity of the first indoor unit 3a and the second indoor unit 3b can be controlled to a constant ventilation capacity. Further, the operation control unit 9 changes the amount of air blown to the air-conditioned space 6 by changing the air-conditioning capacity of the second room unit 3b while keeping the air-conditioning capacity of the first room unit 3a constant. You can also do it.

In the ventilation operation mode, the air obtained by sequentially blowing the first chamber unit 3a and the second chamber unit 3b in the ventilation operation state is supplied to the air conditioning target space 6 as air conditioning air, so that the first chamber unit 3a and the first chamber unit 3a It is possible to air-condition the air-conditioned space 6 by blowing air-conditioned air while minimizing the energy consumption in the two-indoor unit 3b.

(Dehumidification reheat operation mode)
In the dehumidifying / reheating operation mode (corresponding to the mixed operation mode), the operation control unit 9 switches the first chamber unit 3a to the cooling operation state and the second chamber unit 3b to the heating operation state. .. As a result, as shown in FIG. 1, air is taken into the first chamber unit 3a by the air intake path 71, and the first chamber unit 3a is cooled and dehumidified (cooled) by the chamber heat exchanger 31. The air that has been cooled and dehumidified is supplied to the second chamber unit 3b through the inter-unit supply path 72, and the second chamber unit 3b is reheated (heat treated) by the chamber heat exchanger 31. In this way, the air that has been cooled and dehumidified in the first chamber unit 3a and then reheat-treated in the second chamber unit 3b is supplied to the air-conditioned space 6 by the air supply passage 73 as air-conditioned air.

In the dehumidifying / reheating operation mode, the indoor humidity H of the air-conditioned space 6 detected by the operation control unit 9 by the humidity detection sensor 11 is set to the target humidity for the operating state of the first indoor unit 3a in the cooling operation state. In addition, the cooling / dehumidifying capacity (cooling capacity) of the first indoor unit 3a is controlled by controlling the rotation speed of the indoor fan 32 of the first indoor unit 3a, the opening degree of the indoor expansion valve 33, and the like. Further, regarding the operating state of the second indoor unit 3b in the heating operation state, the second indoor unit is set so that the room temperature T of the air-conditioning target space 6 detected by the operation control unit 10 by the temperature detection sensor 10 becomes the target temperature. The reheating capacity (heating capacity) of the second indoor unit 3b is controlled by controlling the rotation speed of the indoor fan 32 of 3b, the opening degree of the indoor expansion valve 33, and the like. In this way, the operation control unit 9 adjusts the indoor humidity H to the target humidity by controlling the cooling / dehumidifying capacity (cooling capacity) of the first indoor unit 3a, and the reheating capacity of the second indoor unit 3b. By controlling (heating capacity), the room temperature T can be adjusted to the target temperature. Incidentally, the target humidity and the target temperature can be set by the user or the like by an operation unit such as a remote controller.

In the dehumidification / reheat operation mode, the first indoor unit 3a is in the cooling operation state and the indoor heat exchanger 31 is functioning as an evaporator, while the second indoor unit 3b is in the heating operation state. , The indoor heat exchanger 31 functions as a condenser. As a result, the refrigerant acquires heat (cold heat) from the second indoor unit 3b in the heating operating state, and the refrigerant having the heat (cold heat) is supplied to the first indoor unit 3a in the cooling operating state. Therefore, through the refrigerant of the refrigerant circuit 4, heat is exchanged between the second indoor unit 3b in the heating operation state and the first indoor unit 3a in the cooling operation state, and the air conditioning treatment in each indoor unit 3 is performed. Since it can be done, energy saving can be achieved.

In the dehumidifying / reheating operation mode, the air can be cooled and dehumidified to a desired humidity (target humidity) by first cooling and dehumidifying in the first chamber unit 3a in the cooling operation state, and then for heating. By reheating the second chamber unit 3b in the operating state, the cooled and dehumidified air can be heated to a desired temperature (target temperature). As a result, conditioned air adjusted to a desired temperature and desired humidity can be supplied to the conditioned space 6, and cooling and dehumidification can be performed so that a desired conditioned environment can be obtained in the conditioned space 6.

(1st cooling operation mode)
In the first cooling operation mode, the operation control unit 9 switches the first room unit 3a to the ventilation operation state and the second room unit 3b to the cooling operation state. As a result, as shown in FIG. 1, air is taken into the first chamber unit 3a by the air intake passage 71, and the air blown by the first chamber unit 3a is sent to the second chamber unit 3b by the inter-unit supply passage 72. The second indoor unit 3b is supplied and cooled by the indoor heat exchanger 31. In this way, the first chamber unit 3a is blown, and then the air cooled by the second chamber unit 3b is supplied as air conditioning air to the air conditioning target space 6 through the air supply passage 73.

In the first cooling operation mode, the operation control unit 9 controls the rotation speed of the indoor fan 32 of the first indoor unit 3a to a predetermined rotation speed with respect to the operating state of the first indoor unit 3a in the ventilation operation state. , The ventilation capacity of the first chamber unit 3a is controlled to a constant ventilation capacity. Regarding the operating state of the second indoor unit 3b in the cooling operation state, the rotation of the indoor fan 32 of the second indoor unit 3b so that the room temperature T detected by the operation control unit 10 by the temperature detection sensor 10 becomes the target temperature. The cooling capacity of the second indoor unit 3b is controlled by controlling the speed, the opening degree of the indoor expansion valve 33, and the like. In this way, the operation control unit 9 can adjust the room temperature T to the target temperature by controlling the cooling capacity of the second chamber unit 3b.

In the first cooling operation mode, the first indoor unit 3a is blown in the air-conditioning operation state, and the air cooled by the second indoor unit 3b is supplied to the air-conditioned space 6 as air-conditioned air. The air-conditioned space 6 can be cooled by supplying the cooled air-conditioned air while suppressing the energy consumption in the indoor unit 3a.

(Second cooling operation mode)
In the second cooling operation mode, the operation control unit 9 switches the first chamber unit 3a and the second chamber unit 3b to the cooling operation state. As a result, as shown in FIG. 1, air is taken into the first indoor unit 3a by the air intake path 71, and the first indoor unit 3a is cooled by the indoor heat exchanger 31 and cooled. Is supplied to the second chamber unit 3b through the inter-unit supply path 72, and the second chamber unit 3b is cooled again by the chamber heat exchanger 31. In this way, the air that has been cooled by the first chamber unit 3a and then cooled again by the second chamber unit 3b is supplied to the air-conditioned space 6 by the air supply passage 73 as air-conditioned air.

In the second cooling operation mode, regarding the operating state of the first indoor unit 3a in the cooling operation state, the operation control unit 9 sets the rotation speed of the indoor fan 32 of the first indoor unit 3a to a constant rotation speed and the indoor expansion valve. By setting the opening degree of 33 to a constant opening degree or the like, the cooling capacity of the first chamber unit 3a can be controlled to a constant cooling capacity. Regarding the operating state of the second indoor unit 3b in the cooling operation state, the rotation of the indoor fan 32 of the second indoor unit 3b so that the room temperature T detected by the operation control unit 10 by the temperature detection sensor 10 becomes the target temperature. The cooling capacity of the second indoor unit 3b is controlled by controlling the speed, the opening degree of the indoor expansion valve 33, and the like. In this way, the operation control unit 9 can adjust the room temperature T to the target temperature by controlling the cooling capacity of the second chamber unit 3b with the cooling capacity of the first chamber unit 3a as a constant capacity.

In the second cooling operation mode, not only the first chamber unit 3a but also the second chamber unit 3b supplies the cooled air to the air-conditioned space 6 as air-conditioned air, so that the first chamber unit 3a and the first chamber unit 3a The air that has been sufficiently cooled in two stages with the two indoor units 3b can be supplied to the air-conditioned space 6 to efficiently and smoothly cool the air-conditioned space 6.

The operation control unit 9 is configured to select and execute any of a plurality of operation modes according to the load condition of the air-conditioned space 6. In order to grasp the load status of the air-conditioning target space 6, a temperature detection sensor 10 for detecting the room temperature T of the air-conditioning target space 6 and a humidity detection sensor 11 for detecting the indoor humidity H of the air-conditioning target space 6 are provided. .. Although the temperature detection sensor 10 and the humidity detection sensor 11 can be provided separately, they can also be provided as a temperature / humidity sensor capable of detecting both temperature and humidity.

For example, when the air conditioning load of the air conditioning target space 6 is reduced by executing the dehumidifying / reheating operation mode, the operation control unit 9 can switch the operation mode from the dehumidifying / reheating operation mode to the ventilation operation mode. Further, if the air conditioning load in the air conditioning target space 6 increases even after executing the dehumidifying / reheating operation mode, the operation control unit 9 may switch the operation mode from the dehumidifying / reheating operation mode to the first cooling operation mode. can. In this way, the operation control unit 9 can switch the operation mode according to the load condition of the air conditioning target space 6, so that a good environment can be obtained as the air conditioning environment of the air conditioning target space 6.

The operation in each of the dehumidifying / reheating operation mode, the first cooling operation mode, and the second cooling operation mode will be described with reference to the flowcharts of FIGS. 3 to 5.

(Operation in dehumidifying and reheating operation mode)
In the dehumidifying / reheating operation mode, as described above, the operation control unit 9 controls the cooling / dehumidifying capacity (cooling capacity) of the first room unit 3a as the operating state of the first room unit 3a and the second room unit 3b. Therefore, the room temperature T is adjusted to the target temperature by adjusting the indoor humidity H to the target humidity and controlling the reheating capacity (heating capacity) of the second indoor unit 3b.

In this operating state, as shown in FIG. 3, the operation control unit 9 determines whether or not the room temperature T detected by the temperature detection sensor 10 is constant, and if the room temperature T is not constant, the room temperature is not constant. It is determined whether or not T has increased (in the case of No in step # 1, step # 2). When the room temperature T has decreased, the operation control unit 9 determines whether or not the indoor humidity H detected by the humidity detection sensor 11 has increased, and if the indoor humidity H has decreased, The operation mode is switched from the dehumidification / reheat operation mode to the ventilation operation mode (in the case of No in step # 2, step # 4 in the case of No in step # 3). In this way, when the room temperature T decreases and the indoor humidity H also decreases due to the execution of the dehumidifying and reheating operation mode, it is assumed that excessive cooling is performed with respect to the cooling load of the air-conditioned space 6, and the operation is controlled. Part 9 switches the operation mode from the dehumidifying / reheating operation mode to the ventilation operation mode.

When the indoor humidity H is rising, the operation control unit 9 sets the set temperature of the first indoor unit 3a to the initial state (for example, 22 ° C.) and controls the cooling / dehumidifying capacity of the first indoor unit 3a. In addition, the temperature is set to the initial temperature / capacity increase state in which the reheating capacity of the second chamber unit 3b is increased (in the case of Yes in step # 3, step # 5). In this initial temperature / capacity increase state, the cooling / dehumidifying capacity of the first indoor unit 3a is increased so that the indoor humidity H becomes the target humidity. The room temperature of 6 may decrease. Therefore, by increasing the reheating capacity of the second indoor unit 3b, the decrease in the room temperature of the air-conditioned space 6 is suppressed, and the indoor humidity H detected by the humidity detection sensor 11 is adjusted to the target humidity while the temperature is adjusted. The room temperature T detected by the detection sensor 10 can also be adjusted to the target temperature.

Returning to step # 2, when the room temperature T has risen, it is determined whether or not the indoor humidity H detected by the humidity detection sensor 11 has risen, and it is determined that the indoor humidity H has decreased or is constant. , The operation control unit 9 sets the set temperature of the first chamber unit 3a to the initial state (for example, 22 ° C.) to control the cooling / dehumidifying capacity of the first chamber unit 3a, and also controls the cooling / dehumidifying capacity of the second chamber unit 3b. It is in the initial temperature / reduced capacity state in which the reheating capacity is lowered (in the case of Yes in step # 2, in the case of No in step # 6, step # 7). In this initial temperature / reduced capacity state, the room temperature of the air-conditioned space 6 is lowered by lowering the reheating capacity of the second chamber unit 3b, and the room temperature T detected by the temperature detection sensor 10 is adjusted to the target temperature. is doing.

When the room temperature T rises further during the execution of step # 7, the operation control unit 9 switches the operation mode from the dehumidification / reheat operation mode to the first cooling operation mode (in the case of Yes in step # 8, step # 9). If the room temperature T rises even after executing the dehumidifying / reheating operation mode, the operation control unit 9 determines that the cooling load of the air-conditioned space 6 cannot be covered, and the operation control unit 9 changes from the dehumidifying / reheating operation mode to the first cooling operation mode. The operation mode is switched to.

Returning to step # 6, when the indoor humidity H has risen, the operation control unit 9 sets the set temperature of the first indoor unit 3a to the lowest state (for example, 14 ° C.) to cool the first indoor unit 3a. The dehumidifying capacity is controlled, and the temperature is set to the minimum temperature / capacity reduction state that reduces the reheating capacity of the second chamber unit 3b (in the case of Yes in step # 6, step # 10). Incidentally, the set temperature of the second chamber unit 3b is set to a constant predetermined temperature (for example, 26 ° C.). In this minimum temperature / capacity decrease state, the set temperature of the first room unit 3a is set to the minimum state (for example, 14 ° C.) and the cooling / dehumidifying capacity of the first room unit 3a is increased to increase the cooling / dehumidifying capacity of the first room unit 3a. The room temperature of the air-conditioned space 6 is lowered by lowering the indoor humidity of the room, adjusting the indoor humidity H detected by the humidity detection sensor 11 to the target humidity, and lowering the reheating capacity of the second indoor unit 3b. The room temperature T detected by the temperature detection sensor 10 is adjusted to the target temperature.

When the room temperature T rises further during the execution of step # 10, the operation control unit 9 switches the operation mode from the dehumidification / reheat operation mode to the second cooling operation mode (in the case of Yes in step # 11, step # 12). When the room temperature T rises even if the set temperature of the first chamber unit 3a is set to the minimum state (for example, 14 ° C.) and the cooling / dehumidifying capacity of the first chamber unit 3a is increased in the dehumidification / reheat operation mode. The operation control unit 9 switches the operation mode from the dehumidifying / reheating operation mode to the second cooling operation mode because the cooling load of the air conditioning target space 6 cannot be covered.

Returning to step # 1, if the room temperature T is constant, the operation control unit 9 determines whether the indoor humidity H is constant, and if the indoor humidity H is constant, the cooling / dehumidifying of the first indoor unit 3a. The capacity and the reheating capacity of the second chamber unit 3b are maintained in the operating state as they are (in the case of Yes in step # 1, in the case of Yes in step # 13, step # 14).

If the indoor humidity H is not constant and the indoor humidity H is rising, the operation control unit 9 sets the set temperature of the first indoor unit 3a to the lowest state (for example, 14 ° C.) and sets the first indoor unit 3a. The cooling / dehumidifying capacity of the second chamber unit 3b is controlled, and the temperature is set to the minimum / capacity increasing state to increase the reheating capacity of the second chamber unit 3b (in the case of No in step # 13, in the case of Yes in step # 15, step # 16). In this minimum temperature / capacity increase state, the set temperature of the first room unit 3a is set to the minimum state (for example, 14 ° C.) to increase the cooling / dehumidifying capacity of the first room unit 3a, so that the first room unit 3a There is a possibility that the room temperature of the air-conditioned space 6 will decrease as the cooling / dehumidifying capacity of the air-conditioned space 6 increases. Therefore, by increasing the reheating capacity of the second indoor unit 3b, the decrease in the room temperature of the air-conditioned space 6 is suppressed, and the indoor humidity H detected by the humidity detection sensor 11 is adjusted to the target humidity while the temperature is adjusted. The room temperature T detected by the detection sensor 10 can also be adjusted to the target temperature.

If the indoor humidity H is not constant and the indoor humidity H is low, the operation control unit 9 sets the set temperature of the first indoor unit 3a to the initial state (for example, 22 ° C.) and sets the first indoor unit 3a. In the case of No in step # 13, in the case of No in step # 15, step # 17). In this initial temperature / capacity decrease state, the cooling / dehumidifying capacity of the first indoor unit 3a is reduced so that the indoor humidity H becomes the target humidity. The room temperature of 6 may rise. Therefore, by reducing the reheating capacity of the second indoor unit 3b, the rise in the room temperature of the air-conditioned space 6 is suppressed, and the indoor humidity H detected by the humidity detection sensor 11 is adjusted to the target humidity while the temperature is adjusted. The room temperature T detected by the detection sensor 10 can also be adjusted to the target temperature.

While the dehumidifying / reheating operation mode is being executed without switching to another operation mode (step # 5, step # 7, step # 10, step # 14, step # 16, step # 17), Every time a predetermined cycle elapses, the process returns to step # 1 to determine whether or not the room temperature T is constant. As a result, the above-mentioned operation is repeated every time a predetermined cycle elapses, and the air-conditioned space 6 can be set to a desired air-conditioned state (target temperature and target humidity), and a comfortable air-conditioned environment can be created. Obtainable.

(Operation in the first cooling operation mode)
In the first cooling operation mode, as described above, in the operating state of the first room unit 3a and the second room unit 3b, the operation control unit 9 sets the first room unit 3a as a predetermined ventilation capacity and sets the second room unit 3b. By controlling the cooling capacity of the room temperature T, the room temperature T is adjusted to the target temperature.

In this operating state, as shown in FIG. 4, the operation control unit 9 determines whether or not the room temperature T detected by the temperature detection sensor 10 is constant, and if the room temperature T is not constant, the room temperature is not constant. It is determined whether or not T has increased (in the case of No in step # 21, step # 22). When the room temperature T is lowered, the operation control unit 9 is in a lowered state in which the cooling capacity of the second chamber unit 3b is lowered (in the case of No in step # 22, step # 23). Incidentally, the set temperature of the second chamber unit 3b is set to a constant predetermined temperature (for example, 26 ° C.). In this lowered state, the room temperature of the air-conditioned space 6 is raised by lowering the cooling capacity of the second chamber unit 3b, and the room temperature T detected by the temperature detection sensor 10 is adjusted to the target temperature.

When the room temperature T further decreases during the execution of step # 23, the operation control unit 9 switches the operation mode from the first cooling operation mode to the dehumidification / reheat operation mode (in the case of Yes in step # 24, step # 25). When the room temperature T drops due to the execution of the first cooling operation mode, the operation control unit 9 dehumidifies from the first cooling operation mode, assuming that the cooling load of the air-conditioned space 6 is excessively cooled. The operation mode is switched to the reheat operation mode.

Returning to step # 22, when the room temperature T rises, the operation control unit 9 is in an elevated state to increase the cooling capacity of the second chamber unit 3b (in the case of Yes in step # 22, step # 26). In this rising state, the room temperature of the air-conditioned space 6 is lowered by increasing the cooling capacity of the second chamber unit 3b, and the room temperature T detected by the temperature detection sensor 10 is adjusted to the target temperature.

When the room temperature T rises further during the execution of step # 26, the operation control unit 9 switches the operation mode from the first cooling operation mode to the second cooling operation mode (in the case of Yes in step # 27, step # 28). If the room temperature T rises even after executing the first cooling operation mode, the operation control unit 9 determines that the cooling load of the air-conditioned space 6 cannot be covered, and the operation control unit 9 changes from the first cooling operation mode to the second cooling operation mode. The operation mode is switched to.

Returning to step # 21, if the room temperature T is constant, the operation control unit 9 determines whether or not the indoor humidity H is constant and whether or not the indoor humidity H is rising (step). # 29, step # 30). If the indoor humidity H is constant, the operation control unit 9 maintains the cooling capacity of the second indoor unit 3b in the operating state as it is (in the case of Yes in step # 29, step # 31), and the indoor humidity H is constant. Even if it is not, if it is lowered, the cooling capacity of the second chamber unit 3b is maintained in the operating state as it is (in the case of No in step # 29, in the case of No in step # 30, step # 32).

If the indoor humidity H is not constant and rises, the operation control unit 9 switches the operation mode from the first cooling operation mode to the dehumidifying / reheating operation mode (in the case of No in step # 29, step # 30). In the case of Yes, step # 33). If the indoor humidity H rises even after executing the first cooling operation mode, the operation control unit 9 changes from the first cooling operation mode to the dehumidifying / reheating operation mode so that the desired humidity can be obtained. Is switching.

While the first cooling operation mode is being executed without switching to another operation mode (step # 23, step # 26, step # 31, step # 32), every time a predetermined cycle elapses, Returning to step # 21, it is determined whether or not the room temperature T is constant. As a result, the above-mentioned operation is repeated every time a predetermined cycle elapses, the air-conditioned space 6 can be set to a desired air-conditioned state (target temperature), and a comfortable air-conditioned environment can be obtained. ..

(Operation in the second cooling operation mode)
In the second cooling operation mode, as described above, in the operating state of the first room unit 3a and the second room unit 3b, the operation control unit 9 sets the first room unit 3a as a predetermined cooling capacity and sets the second room unit 3b. By controlling the cooling capacity of the room temperature T, the room temperature T is adjusted to the target temperature.

In this operating state, as shown in FIG. 5, the operation control unit 9 determines whether or not the room temperature T detected by the temperature detection sensor 10 is constant, and if the room temperature T is not constant, the room temperature is not constant. It is determined whether or not T has increased (in the case of No in step # 41, step # 42). When the room temperature T is lowered, the operation control unit 9 is in a lowered state in which the cooling capacity of the second chamber unit 3b is lowered (in the case of No in step # 42, step # 43). Incidentally, the set temperature of the first chamber unit 3a is set to a constant predetermined temperature (for example, 12 ° C.), and the set temperature of the second chamber unit 3b is set to a constant predetermined temperature (for example, 26 ° C.). In this lowered state, the room temperature of the air-conditioned space 6 is raised by lowering the cooling capacity of the second chamber unit 3b, and the room temperature T detected by the temperature detection sensor 10 is adjusted to the target temperature.

When the room temperature T further decreases during the execution of step # 43, the operation control unit 9 switches the operation mode from the second cooling operation mode to the first cooling operation mode (in the case of Yes in step # 44, step # 45). When the room temperature T drops due to the execution of the second cooling operation mode, the operation control unit 9 determines that the cooling load of the air-conditioned space 6 is excessively cooled, and the operation control unit 9 starts from the second cooling operation mode. 1 The operation mode is switched to the cooling operation mode.

Returning to step # 42, when the room temperature T rises, the operation control unit 9 is in an elevated state to increase the cooling capacity of the second chamber unit 3b (in the case of Yes in step # 42, step # 46). In this rising state, the room temperature of the air-conditioned space 6 is lowered by increasing the cooling capacity of the second chamber unit 3b, and the room temperature T detected by the temperature detection sensor 10 is adjusted to the target temperature.

Returning to step # 41, if the room temperature T is constant, the operation control unit 9 maintains the cooling capacity of the second chamber unit 3b in the operating state as it is (in the case of Yes in step # 41, step # 47).

While the second cooling operation mode is being executed (step # 43, step # 46, step # 47) without switching to another operation mode, step # 41 is performed every time a predetermined cycle elapses. Returning, it is determined whether or not the room temperature T is constant. As a result, the above-mentioned operation is repeated every time a predetermined cycle elapses, the air-conditioned space 6 can be set to a desired air-conditioned state (target temperature), and a comfortable air-conditioned environment can be obtained. ..

Explaining the heating operation for heating the air-conditioned space 6 in winter or the like, the operation control unit 9 switches the operation state of the first room unit 3a and the second room unit 3b to the heating operation state, and operates the humidifier 8. ing. As a result, as shown in FIG. 1, air is taken into the first indoor unit 3a by the air intake path 71, and the first indoor unit 3a is heat-treated by the indoor heat exchanger 31 and the heat-treated air. Is humidified by the humidifier 8, and then supplied to the second chamber unit 3b through the inter-unit supply path 72, and the second chamber unit 3b is heat-treated by the chamber heat exchanger 31. In this way, the air that has been heat-treated by the first chamber unit 3a, humidified by the humidifier 8, and then reheat-treated by the second chamber unit 3b is used as air conditioning air and air-conditioned by the air supply passage 73. It is supplied to the target space 6.

In the heating operation, the operation control unit 9 not only switches both the first room unit 3a and the second room unit 3b to the heating operation state, but also, for example, when the heating load is small, the operation control unit 9 causes the operation control unit 9. , The first chamber unit 3a can be switched to the heating operation state, and the second chamber unit 3b can be switched to the ventilation operation state. As described above, in the heating operation, the operation control unit 9 not only switches both the first room unit 3a and the second room unit 3b to the heating operation state, but also depends on the magnitude of the heating load in the first room. Either one of the unit 3a and the second chamber unit 3b can be switched to the blowing operation state.

[Second Embodiment]
This second embodiment is another embodiment regarding the arrangement configuration of the plurality of indoor units 3 in the first embodiment. Hereinafter, the arrangement configuration of the plurality of indoor units 3 in the second embodiment will be mainly described with reference to FIG. 6, and the other configurations will be omitted by the same reference numerals and the like.

In the first embodiment, as shown in FIG. 1, in the air supply unit 7, the first chamber unit 3a and the second chamber unit 3b are arranged in series. On the other hand, in the second embodiment, as shown in FIG. 6, the first chamber unit 3a and the second chamber unit 3b are arranged in parallel in the air supply unit 7.

In this second embodiment, in order to dispose the first chamber unit 3a and the second chamber unit 3b in parallel, the air supply unit 7 has air in the first chamber unit 3a and the second chamber unit 3b. A branching portion 12 for branching and supplying the air, and a mixing portion 13 for mixing the air from the first chamber unit 3a and the air from the second chamber unit 3b into air-conditioned air are provided.

In this second embodiment, as shown in FIG. 6, as a flow path for passing air, an outside air intake path 75 that takes in outside air into a branch portion 12 and an air branch from the branch portion 12 to a first chamber unit 3a. The first branch supply path 76 for supplying air, the second branch supply path 77 for branching and supplying air from the branch portion 12 to the second chamber unit 3b, and the first for supplying air from the first chamber unit 3a to the mixing section 13. The mixing supply path 78, the second mixing supply path 79 that supplies the air from the second chamber unit 3b to the mixing section 13, and the air supply path that supplies the conditioned air mixed in the mixing section 13 to the air conditioning target space 6. 80 and a return air passage 81 that returns the air in the air-conditioned space 6 to the branch portion 12 as return air are provided.

The air supply section 7 includes an outside air intake path 75, a branch section 12, a first branch supply path 76, a second branch supply path 77, a first mixed supply path 78, a second mixed supply path 79, a mixing section 13, and air supply. It is composed of road 80 and the like. In the air conditioning system 1, the air supply unit 7 branches and supplies the air-fuel mixture of the outside air and the return air to the first chamber unit 3a and the second chamber unit 3b for air conditioning, and the air from the first chamber unit 3a. And the air from the second indoor unit 3b are mixed and the air-conditioned air is supplied to the air-conditioned space 6 as the air-conditioned air after the air-conditioning treatment.

Regarding the configuration and operation in the ventilation operation mode, the dehumidification reheat operation mode, the first cooling operation mode, and the second cooling operation mode in the cooling operation, the branch portion 12 sends air to the first chamber unit 3a and the second chamber unit 3b. The only difference is that the air is branched and supplied, and the air from the first chamber unit 3a and the air from the second chamber unit 3b are mixed by the mixing unit 13 to obtain air-conditioned air, and the other configurations and operations are the same as those of the first embodiment. The same is true.

Further, in the heating operation as well as the cooling operation, the branch portion 12 branches and supplies the air to the first chamber unit 3a and the second chamber unit 3b, and the mixing portion 13 branches and supplies the air from the first chamber unit 3a and the second chamber unit 3a. The only difference is that the air from the indoor unit 3b is mixed to obtain air-conditioned air, and other configurations and operations are the same as those in the first embodiment. The humidifier 8 is arranged on the downstream side of the first chamber unit 3a, and is configured to freely humidify the air heat-treated by the first chamber unit 3a.

[Another Embodiment]
Other embodiments of the present invention will be described.
It should be noted that the configurations of the respective embodiments described below are not limited to being applied individually, but can also be applied in combination with the configurations of other embodiments.

(1) In the above embodiment, an example is shown in which two indoor units 3 are provided, the first indoor unit 3a and the second indoor unit 3b, but the number of the indoor units 3 can be changed as appropriate. It is also possible to include one or more indoor units 3.

(2) In the above embodiment, in the first cooling operation mode, the operation control unit 9 switches the first chamber unit 3a to the ventilation operation state and the second chamber unit 3b to the cooling operation state. However, conversely, the operation control unit 9 can switch the first chamber unit 3a to the cooling operation state and the second chamber unit 3b to the ventilation operation state.

1 Air conditioning system 2 Outdoor unit 3 Indoor unit 4 Refrigerant circuit 6 Air conditioning target space 7 Air supply unit 9 Operation control unit 12 Branch unit 13 Mixing unit

Claims (6)

A refrigerant circuit in which a plurality of indoor units are connected to one outdoor unit is provided.
The indoor unit is an air-conditioning system that can be switched to a plurality of operating states and that can perform air-conditioning processing using the refrigerant supplied by the refrigerant circuit in the operating state.
An air supply unit that supplies air-conditioned air to the air-conditioned space,
It is provided with an operation control unit that controls the operation state of the plurality of indoor units.
The plurality of indoor units are provided in an intermediate portion of the air supply unit.
The air supply unit is configured to use air that has been air-conditioned by the plurality of indoor units as air-conditioned air and supply the air-conditioned air to the air-conditioned space.
The operation control unit is an air conditioning system configured to be capable of executing a mixed operation mode in which a plurality of indoor units are switched to any of a plurality of operating states in a form in which indoor units having different operating states are mixed. The air supply unit is provided with two indoor units.
In the mixed operation mode, the operation control unit switches to a cooling operation state in which one indoor unit is cooled as an air conditioning treatment, and the other indoor unit is heat-treated as an air conditioning treatment. The air conditioning system according to claim 1, wherein the state is switched. The air supply unit is provided with two indoor units in series in the air flow direction.
In the mixed operation mode, the operation control unit switches the indoor unit located on the upstream side in the air flow direction to a cooling operation state in which the indoor unit is cooled as an air conditioning process, and is on the downstream side in the air flow direction. The air-conditioning system according to claim 2, wherein the indoor unit located in the above is switched to a heating operation state in which heat treatment is performed as air-conditioning treatment. The air supply unit is provided with two indoor units in parallel in the air flow direction.
The air supply unit is obtained by mixing a branch portion that branches and supplies air to the indoor unit on one side and the indoor unit on the other side, and air from the indoor unit on one side and air from the indoor unit on the other side. The air-conditioning system according to claim 2, further comprising a mixing unit for conditioned air. The operation control unit is set as an operation mode.
The mixed operation mode and
A ventilation operation mode in which both of the two indoor units are switched to a ventilation operation state in which air is blown without air conditioning.
Of the two indoor units, the first cooling operation mode in which one indoor unit is switched to the ventilation operation state and the other indoor unit is switched to the cooling operation state.
The air conditioning system according to any one of claims 2 to 4, wherein any operation mode of the second cooling operation mode for switching both of the two indoor units to the cooling operation state can be executed. The air conditioning system according to claim 5, wherein the operation control unit is configured to select and execute one of a plurality of operation modes according to a load condition of the air conditioning target space.

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