JP2016003799A - Air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve dehumidification performance and energy-saving performance in a system having high versatility, which includes a plurality of indoor heat exchangers with respect to an air-conditioned space.SOLUTION: In an air conditioning system, plural indoor heat exchangers 9 is provided with respect to an air-conditioned space 1. The air conditioning system includes: a refrigerant circuit 2 that circulates refrigerant to a compressor 6, an outdoor heat exchanger 7, an expansion unit 8 and the plural indoor heat exchangers 9; an air supply path 3 that supplies air outside the air-conditioned space 1 into the air-conditioned space 1; an exhaust path 4 that exhausts the air inside the air-conditioned space 1 to the outside of the air-conditioned space 1; a dehumidification unit 5 that adsorbs moisture of the air supplied into the air-conditioned space 1 in the air supply path 3, and emitting the moisture to the air exhausted to the outside of the air-conditioned space 1 in the exhaust path 4; a heating unit 14 that heats air before supplied to the dehumidification unit 5 in the exhaust path 4 by the refrigerant of the refrigerant circuit 2; and a cooling unit 15 that cools the air supplied into the air-conditioned space 1 in the air supply path 3 by the refrigerant of the refrigerant circuit 2.

Description

  The present invention relates to an air conditioning system that performs air conditioning of an air conditioning target space.

  As an air conditioning system as described above, for example, a system in which a direct expansion type air conditioner that cools and heats an air-conditioning target space and a desiccant device that dehumidifies the air-conditioning target space has been proposed (for example, a patent) References 1 and 2).

  In the systems described in Patent Documents 1 and 2, a direct expansion type air conditioner includes a refrigerant circuit that allows a refrigerant to flow through a compressor, an outdoor heat exchanger, an expansion unit, and an indoor heat exchanger, and is subject to air conditioning. By supplying the refrigerant to the indoor heat exchanger provided in the space, the air-conditioning target space is cooled or heated. The desiccant device adsorbs moisture in the air supplied to the room from the outside through the air supply path for supplying the outdoor air to the room, the exhaust path for exhausting the indoor air to the outside, and the exhaust path. Is provided with a dehumidifying part (desiccant rotor) that releases moisture to the air exhausted from the room to the outside, and performs ventilation and dehumidification of the air-conditioning target space.

  In the system described in Patent Document 1, a heating heat exchanger is provided on the upstream side of the desiccant rotor in the exhaust passage, before the refrigerant is supplied to the heating heat exchanger and supplied to the desiccant rotor in the exhaust passage. By heating the air, the heat of the refrigerant is also used for regeneration of the desiccant rotor. In the system described in Patent Document 2, not only a heating heat exchanger is provided upstream of the desiccant rotor in the exhaust passage, but also a cooling heat exchanger is provided upstream or downstream of the desiccant rotor in the supply passage. The refrigerant is supplied to the cooling heat exchanger to cool the air supplied to the air-conditioning target space through the air supply path. Thus, in the system described in Patent Document 2, the heat of the refrigerant is used not only for regeneration of the desiccant rotor but also for cooling the air supplied to the air-conditioning target space through the air supply path.

  As described above, in the systems described in Patent Documents 1 and 2, the heat of the refrigerant is used not only in the air conditioner but also in the desiccant device, thereby improving the energy saving performance.

JP 2005-180885 A Japanese Patent No. 5062216

  However, in the system described in Patent Document 1, when the heat of the refrigerant is used in the desiccant device, it is only used for regeneration of the desiccant rotor, so there is room for improvement in terms of energy saving performance. In this regard, in the system described in Patent Document 2, the heat of the refrigerant is used not only for regeneration of the desiccant rotor but also for cooling the air supplied to the air-conditioning target space in the air supply path. The energy saving performance can be improved as compared with the system described in 1.

  However, the system described in Patent Literature 2 includes one indoor heat exchanger for the air-conditioning target space, or a system including one indoor heat exchanger for each of the plurality of air-conditioning target spaces. Therefore, there is a possibility that the air conditioning target space cannot be properly air-conditioned.

  On the other hand, recently, an air conditioning system including a plurality of indoor heat exchangers for an air-conditioning target space has become widespread. In this system, even if the air-conditioning target space is a large space, the air-conditioning target space can be appropriately air-conditioned by a plurality of indoor heat exchangers. Therefore, since such an air conditioning system can be widely used in buildings and the like, it is desired to improve dehumidification performance and energy saving performance in such a highly versatile air conditioning system.

  In view of this situation, the main problem of the present invention is to improve dehumidification performance and energy saving performance in a system that includes a plurality of indoor heat exchangers for an air-conditioned space and can appropriately air-condition the air-conditioned space. It is to provide an air conditioning system that can do this.

The first characteristic configuration of the present invention is provided with a plurality of indoor heat exchangers for the air-conditioning target space,
A compressor, an outdoor heat exchanger, an expansion unit, and a refrigerant circuit for allowing a refrigerant to flow through the plurality of indoor heat exchangers;
An air supply path for supplying air outside the air conditioning target space into the air conditioning target space;
An exhaust path for exhausting the air in the air conditioning target space to the outside of the air conditioning target space;
A dehumidifying unit that adsorbs moisture in the air supplied into the air-conditioning target space in the air supply path and releases moisture to the air exhausted outside the air-conditioning target space in the exhaust path;
A heating unit that heats the air before being supplied to the dehumidifying unit in the exhaust passage by the refrigerant of the refrigerant circuit;
And a cooling unit that cools the air supplied into the air-conditioning target space in the air supply path by the refrigerant in the refrigerant circuit.

  According to this characteristic configuration, since a plurality of indoor heat exchangers are provided for the air-conditioning target space, as described above, the air-conditioning target space can be appropriately air-conditioned, and heat transfer loss when transferring heat can be reduced. Cost can be reduced, and a highly versatile system that can be widely used in buildings such as buildings can be obtained. In such a highly versatile system, the heating unit heats the air before being supplied to the dehumidifying unit by the refrigerant, and the cooling unit uses the air in the air supply path that is supplied into the air-conditioned space by the refrigerant. Can be cooled. Therefore, the heat of the refrigerant is used not only for the regeneration of the desiccant rotor (dehumidifying part) but also for cooling the air supplied to the air-conditioning target space through the air supply path, thereby improving the dehumidifying performance and energy saving performance. It is possible to provide a highly versatile air conditioning system capable of

  In addition, the heating unit uses the heat that has been radiated to the outside by the outdoor heat exchanger to heat the air before being supplied to the dehumidification unit, so that the heat can be used effectively to the outside. This makes it possible to reduce the amount of heat released and to improve the energy saving performance. Further, since the heating unit and the cooling unit use the heat of the refrigerant supplied to each of the plurality of indoor heat exchangers, even if the heat of the refrigerant supplied to one indoor heat exchanger is small The heat of the refrigerant supplied to each of the plurality of indoor heat exchangers can be collected and used. Therefore, when the heat of the refrigerant is used for regeneration of the desiccant rotor and cooling of the air supplied to the air-conditioning target space through the air supply path, sufficient heat can be ensured and used effectively and appropriately. From this point, it is possible to improve the dehumidifying performance and the energy saving performance.

  The 2nd characteristic structure of this invention exists in the point to which the said some indoor heat exchanger and the said cooling part are connected in series in the said refrigerant circuit.

  According to this characteristic configuration, for example, a plurality of indoor heat exchangers and cooling units can be connected in series in the refrigerant flow direction. In this case, since the heat of the refrigerant after being supplied to each of the plurality of indoor heat exchangers can be used in the cooling unit, the heat of the refrigerant is first given priority to each of the plurality of indoor heat exchangers. It is possible to cool the cooling unit with the remaining heat while air-conditioning the air-conditioning target space. Thereby, it is possible to improve the dehumidifying performance and the energy saving performance while appropriately performing air conditioning of the air-conditioning target space by a plurality of indoor heat exchangers.

According to a third characteristic configuration of the present invention, the cooling unit is disposed on the downstream side of the dehumidifying unit and the first cooling unit disposed on the upstream side of the dehumidifying unit in the air flow direction in the air supply path. And a second cooling part,
In the refrigerant circuit, the first cooling part and the second cooling part are connected in parallel or in series.

  According to this characteristic configuration, by performing the cooling by the first cooling unit, the relative humidity of the air supplied to the dehumidifying unit is increased, and the moisture can be efficiently and effectively adsorbed by the dehumidifying unit. You can make it appear. In addition, by performing the cooling by the second cooling unit, it is possible to cool the air whose temperature has increased due to moisture adsorption by the dehumidifying unit. Therefore, for example, when the air-conditioning target space is cooled by an indoor heat exchanger, the cooled air can be supplied to the air-conditioning target space that is being cooled, without hindering the effect of cooling, Ventilation and dehumidification can be performed, and a comfortable air-conditioning environment can be provided.

A fourth characteristic configuration of the present invention includes the compressor, the outdoor heat exchanger, the plurality of expansion sections, the plurality of indoor heat exchangers, the refrigerant circuit, the air supply path, the exhaust path, the dehumidifying section, A unit device group comprising the heating unit and the device group having the cooling unit as one unit is configured,
The air-conditioning target space is divided into a plurality of zones, and one unit device group is provided for each of the plurality of zones.

  For example, depending on the size and shape of the air conditioning target space, it may be preferable to divide into a plurality of zones and perform air conditioning for each zone. Therefore, in this feature configuration, the air-conditioning target space is divided into a plurality of zones, and one unit device group is provided for each of the plurality of zones. Thereby, even when the air-conditioning target space is divided into a plurality of zones, it is possible to appropriately perform air conditioning of the zones while improving the dehumidifying performance and energy saving performance in each zone.

Diagram showing schematic configuration of air conditioning system The figure which shows the arrangement configuration of the air-conditioning system when dividing the air-conditioning target space into a plurality of zones The figure which shows schematic structure of the air conditioning system in 2nd Embodiment. The figure which shows schematic structure of the air conditioning system in 3rd Embodiment.

An embodiment of an air-conditioning system according to the present invention will be described with reference to the drawings.
[First Embodiment]
As shown in FIG. 1, this air conditioning system 100 uses a room of a building such as a building as an air conditioning target space 1, an outdoor unit 10 for cooling and heating the air conditioning target space 1, a plurality of indoor units 12, and A refrigerant circuit 2 that connects them, an air supply path 3 for exhausting and dehumidifying the air-conditioning target space 1, an exhaust path 4, and a desiccant rotor 5 (corresponding to a dehumidifying section) are provided. Incidentally, although the number of indoor units 12 is three in FIG. 1, this number can be changed as appropriate.

  The refrigerant circuit 2 is configured to allow the refrigerant to flow through the compressor 6, the outdoor heat exchanger 7, the plurality of expansion valves 8 (corresponding to the expansion portion), and the plurality of indoor heat exchangers 9. The plurality of indoor heat exchangers 9 are connected in parallel, and the refrigerant branches off and is supplied to each of the plurality of indoor heat exchangers 9. The outdoor unit 10 includes a compressor 6, an outdoor heat exchanger 7, and an outdoor fan 11, and the air (outside air) ventilated by the outdoor fan 11 in the outdoor heat exchanger 7 exchanges heat with the refrigerant. I am letting. A plurality of indoor units 12 are provided for the air-conditioning target space 1, and each of the plurality of indoor units 12 is provided with an expansion valve 8, an indoor heat exchanger 9, and an indoor fan 13. In each of the plurality of indoor units 12, the air sucked from the air-conditioning target space 1 is supplied to the indoor heat exchanger 9 by the indoor fan 13, and the supplied air is returned to the air-conditioning target space 1. The air in the target space 1 is circulated in a state in which heat is exchanged with the refrigerant in the indoor heat exchanger 9.

  In the refrigerant circuit 2 shown in FIG. 1, the refrigerant is circulated in the order of the compressor 6, the outdoor heat exchanger 7, the plurality of expansion valves 8, and the plurality of indoor heat exchangers 9, so that the outdoor heat exchanger 7 is a condenser. In addition, each of the plurality of indoor heat exchangers 9 functions as an evaporator to cool the air-conditioning target space 1.

  Incidentally, although illustration is omitted, a switching valve (for example, a four-way valve) for switching the refrigerant flow state is provided in the refrigerant circuit 2, and the compressor 6, the plurality of indoor heat exchangers 9, and the plurality of expansions are provided by the switching valve. By switching to the state in which the refrigerant is circulated and supplied in the order of the valve 8 and the outdoor heat exchanger 7, the outdoor heat exchanger 7 functions as an evaporator, and the plurality of indoor heat exchangers 9 function as condensers. The target space 1 can also be heated.

  The air supply path 3 is configured by a flow path that supplies air outside the air-conditioning target space 1 (outside air) into the air-conditioning target space 1, and the exhaust path 4 supplies the air in the air-conditioning target space 1 to the air-conditioning target space. 1 is constituted by a flow path exhausting outside. The air supply path 3 and the exhaust path 4 are provided adjacent to each other, and the desiccant rotor 5 is driven to rotate by a drive unit (not shown) so as to pass through the air supply path 3 and the exhaust path 4 alternately. Has been placed. The desiccant rotor 5 includes, for example, an adsorbent such as a polymer adsorbent, zeolite, silica gel, etc., adsorbs the moisture of the outside air supplied into the air-conditioning target space 1 through the air supply path 3, and the exhaust path 4. Is configured to release moisture to the air exhausted outside the air-conditioning target space 1.

  Here, the arrangement of the air supply path 3, the exhaust path 4, and the desiccant rotor 5 is not illustrated, but for example, dehumidification provided with the air supply path 3, the exhaust path 4, and the desiccant rotor 5. A unit can be configured and a dehumidifying unit can be provided separately from the outdoor unit 10. Further, instead of this dehumidifying unit, the outdoor unit 10 may be provided with an air supply path 3, an exhaust path 4, and a desiccant rotor 5.

  In this manner, the air conditioning target space 1 is cooled and dehumidified by the air supply path 3, the exhaust path 4, and the desiccant rotor 5 while the refrigerant circuit 2 cools the air conditioning target space 1. In this air conditioning system 100, since the plurality of indoor heat exchangers 9 are provided for the air-conditioning target space 1, even if the air-conditioning target space 1 is a large space, it can be appropriately cooled by the plurality of indoor heat exchangers 9. . Such an air conditioning system 100 can be used for a wide variety of buildings, and is a highly versatile system such as a multi air conditioning system for buildings.

  In this air conditioning system 100, by providing the heating unit 14 and the cooling unit 15, the heat of the refrigerant of the refrigerant circuit 2 is not used only for cooling the air-conditioning target space 1, but the regeneration of the desiccant rotor 5 and The air supply passage 3 is also used for cooling the outside air supplied to the air-conditioning target space 1.

  The heating unit 14 is configured to heat the air before being supplied to the desiccant rotor 5 through the exhaust passage 4 by the refrigerant of the refrigerant circuit 2. The heating unit 14 is configured by a heat exchanger that receives supply of a refrigerant and directly heats the air with the refrigerant. The heating unit 14 is disposed in front of the desiccant rotor 5 in the air flow direction in the exhaust passage 4. Yes. The heating unit 14 is arranged in the refrigerant circuit 2 in a state of being connected in series between the compressor 6 and the outdoor heat exchanger 7, and is supplied with superheated steam refrigerant (high-temperature high-pressure gas) from the compressor 6. It is configured to be.

  The cooling unit 15 is configured to cool the outside air supplied into the air-conditioning target space 1 in the air supply path 3 by the refrigerant of the refrigerant circuit 2. The cooling unit 15 is configured by a heat exchanger that receives supply of a refrigerant and directly cools outside air with the refrigerant. The cooling unit 15 is arranged in a state of being connected in series between the plurality of indoor heat exchangers 9 and the compressor 6 in the refrigerant circuit 2, and is a refrigerant of superheated steam (low pressure gas) from the indoor heat exchanger 9. Is configured to be supplied.

  As the cooling unit 15, a first cooling unit 15 a disposed on the upstream side of the desiccant rotor 5 and a second cooling unit 15 b disposed on the downstream side of the desiccant rotor 5 in the air supply passage 3 in the flow direction of the outside air Is provided. The first cooling unit 15 a is disposed in front of the desiccant rotor 5 in the air supply path 3 in the direction of the outside air flow, and the second cooling unit 15 b is the desiccant rotor in the direction of the outside air flow in the air supply path 3. It is arranged downstream of 5. The first cooling unit 15 a and the second cooling unit 15 b are connected in parallel in the refrigerant circuit 2, and the superheated steam refrigerant (low-pressure gas) from the indoor heat exchanger 9 is branched and supplied.

  In the refrigerant circuit 2, the compressor 6, the heating unit 14, the outdoor heat exchanger 7, the plurality of expansion valves 8, the plurality of indoor heat exchangers 9, and the cooling unit 15 (the first cooling unit 15a and the second cooling unit 15b). The refrigerant is circulated in order. As a result, each of the plurality of indoor heat exchangers 9 functions as an evaporator to cool the air-conditioning target space 1, and the heating unit 14 functions as a condenser to allow the desiccant rotor 5 to function in the exhaust passage 4. The dried air can be supplied to the desiccant rotor 5 by heating the air before being supplied to the desiccant rotor 5. Therefore, water can be sufficiently released from the desiccant rotor 5 to the air in the exhaust passage 4, and therefore, moisture is sufficiently adsorbed in the desiccant rotor 5 from which water is sufficiently released in the air supply passage 3. And the dehumidifying performance can be improved.

  In addition, the first cooling unit 15a functions as an evaporator to cool the outside air before being supplied to the desiccant rotor 5 in the air supply path 3, thereby increasing the relative humidity and adsorbing moisture by the desiccant rotor 5. Thus, it is possible to reveal a state in which the dehumidifying performance can be efficiently and effectively performed, and from this point, it is possible to improve the dehumidifying performance. Furthermore, since the second cooling unit 15b can function as an evaporator to cool the outside air whose temperature has risen due to moisture adsorption by the desiccant rotor 5, the air-conditioning target space 1 that is cooled by the indoor heat exchanger 9 can be cooled. On the other hand, the cooled outside air can be supplied, ventilation and dehumidification can be performed without impeding the cooling effect, and a comfortable air-conditioning environment can be provided.

  Further, in the refrigerant circuit 2, since the plurality of indoor heat exchangers 9 and the cooling unit 15 (the first cooling unit 15a and the second cooling unit 15b) are connected in order, the circuit configuration is simplified, Comfortable air-conditioning that can be used in the cooling unit 15 to cool the air-conditioning target space 1 after being evaporated in two stages of the heat exchanger 9 and the cooling unit 15 and used in the cooling unit 15 Energy saving performance can be improved while giving priority to obtaining the environment.

  As described above, when the air conditioning system 100 is used as a multi-air conditioning system for buildings, the air-conditioning target space 1 may be divided into a plurality of zones 1a to 1d as shown in FIG. In the example shown in FIG. 2, for example, there is a core provided with a toilet, a staircase, etc. (not shown) in the center of the building in plan view, and an area surrounding the core is an air-conditioning target space 1. Space 1 is divided into four zones according to the direction, such as east zone 1a, west zone 1b, south zone 1c, and north zone 1d.

  In this case, the compressor 6, the outdoor heat exchanger 7, the plurality of expansion valves 8, the plurality of indoor heat exchangers 9, the refrigerant circuit 2, the air supply path 3, the exhaust path 4, the desiccant rotor 5, the heating unit 14, And the unit apparatus group which uses the apparatus group which has the cooling part 15 as one unit is comprised, and one unit apparatus group is provided with respect to each of several zone 1a-1d. That is, as shown in FIG. 2, one outdoor unit 10 and a plurality of indoor units 12 and a refrigerant circuit 2 connecting them to each of the east zone 1a, the west zone 1b, the south zone 1c, and the north zone 1d. And are provided. At this time, the number and installation locations of the indoor units 12 provided in each zone can be changed for each zone, and the numbers and installation locations suitable for air-conditioning the zones are set.

  Further, as described above, with respect to the air supply path 3, the exhaust path 4, and the desiccant rotor 5, a dehumidifying unit including them is provided separately from the outdoor unit 10, or the air supply path 3 is provided in the outdoor unit 10. The exhaust path 4 and the desiccant rotor 5 can be provided. Therefore, although omitted in FIG. 2, one supply passage 3, one exhaust passage 4, and one desiccant rotor 5 are provided for each of the east zone 1a, the west zone 1b, the south zone 1c, and the north zone 1d. Is provided.

  Thus, even when it is divided into a plurality of zones 1a to 1d, it is possible to appropriately perform cooling by the plurality of indoor heat exchangers 9 while improving the dehumidifying performance for each zone, and a comfortable air conditioning environment Can be provided. In addition, since one unit device group can be provided for each zone, when air-conditioning space 1 is air-conditioned, it is preferable to divide it into a plurality of zones according to various conditions such as size and shape. Even when it is easy to do, it can respond flexibly to the request.

[Second Embodiment]
In the first embodiment, as shown in FIG. 1, the plurality of indoor heat exchangers 9 and the cooling unit 15 are connected in series as a connection configuration of the plurality of indoor heat exchangers 9 and the cooling unit 15 in the refrigerant circuit 2. doing. On the other hand, in this 2nd Embodiment, as shown in FIG. 3, as a connection structure of the some indoor heat exchanger 9 and the cooling part 15 in the refrigerant circuit 2, several indoor heat exchanger 9 and the cooling part 15 are used. Are connected in parallel. In this case, in the refrigerant circuit 2, the expansion valve 8 is provided at the front side of each of the first cooling unit 15 a and the second cooling unit 15 b as the cooling unit 15. Other configurations are the same as those in the first embodiment.

  Thereby, in the refrigerant circuit 2, the refrigerant of the supercooled liquid from the outdoor heat exchanger 7 is branched and supplied to each of the plurality of expansion valves 8 to be expanded into a wet vapor refrigerant, and the wet vapor refrigerant is converted into a plurality of refrigerants. It supplies to each of the indoor heat exchanger 9, the 1st cooling part 15a, and the 2nd cooling part 15b, and it is made to evaporate. Therefore, in addition to the plurality of indoor heat exchangers 9, the first cooling unit 15 a and the second cooling unit 15 b function not only to cool the air-conditioning target space 1, but also to the first cooling unit 15 a and The outside air is cooled by the second cooling unit 15b.

[Third Embodiment]
In the said 1st and 2nd embodiment, as shown in FIG.1 and FIG.3, as a connection structure of the heating part 14 and the outdoor heat exchanger 7 in the refrigerant circuit 2, the heating part 14 and the outdoor heat exchanger 7 are serially connected in order. Connected. On the other hand, in the third embodiment, as shown in FIG. 4, as a connection configuration of the heating unit 14 and the outdoor heat exchanger 7 in the refrigerant circuit 2, the outdoor heat exchanger 7 and the heating unit 14 are connected in series. ing. Thereby, in the refrigerant circuit 2, the refrigerant of the supercooled liquid from the outdoor heat exchanger 7 is supplied to the heating unit 14 to be condensed, and before being supplied to the desiccant rotor 5 through the exhaust passage 4 in the heating unit 14. The air is heated.

[Another embodiment]
(1) In the first to third embodiments, in the refrigerant circuit 2 shown in FIGS. 1, 3, and 4, the compressor 6, the heating unit 14, the outdoor heat exchanger 7, the plurality of expansion valves 8, the plurality The refrigerant is circulated and supplied in the order of the indoor heat exchanger 9 and the cooling unit 15 (the first cooling unit 15a and the second cooling unit 15b) to cool the air-conditioning target space 1. In addition to this cooling, as described above, a switching valve (for example, a four-way valve) for switching the refrigerant flow state is provided in the refrigerant circuit 2, and the compressor 6, the plurality of indoor heat exchangers 9, a plurality of switching valves are provided. By switching to the state in which the refrigerant is circulated and supplied in the order of the expansion valve 8 and the outdoor heat exchanger 7, the outdoor heat exchanger 7 functions as an evaporator and the plurality of indoor heat exchangers 9 function as condensers. The air-conditioning target space 1 can also be heated.

  In this system that can be switched between cooling and heating, the heating unit 14 and the cooling unit 15 are also provided with a switching channel and a switching valve for switching the refrigerant flow state, and the compressor 6, the heating unit 14, and a plurality of indoor units. By switching to a state in which the refrigerant is circulated and supplied in the order of the heat exchanger 9, the plurality of expansion valves 8, the outdoor heat exchanger 7, and the cooling unit 15, the outdoor heat exchanger 7 functions as an evaporator and a plurality of indoor heat While the exchanger 9 functions as a condenser and heats the air-conditioning target space 1, the regeneration of the desiccant rotor 5 by the heating unit 14 and the air supply path 3 by the cooling unit 15 supply the air-conditioning target space 1. Cooling of the outside air can also be performed.

(2) In the first to third embodiments, in the refrigerant circuit 2, the first cooling unit 15a and the second cooling unit 15b are connected in parallel, but the first cooling unit 15a and the second cooling unit 15b are connected in series. It can also be implemented by connecting. In this case, it is possible to appropriately change which of the first cooling unit 15a and the second cooling unit 15b is arranged on the upstream side.

(3) In the first to third embodiments, the cooling unit 15 includes both the first cooling unit 15a and the second cooling unit 15b, but only the first cooling unit 15a or the second cooling unit. Only 15b can be provided.

(4) In the first to third embodiments, the heating unit 14 is configured by a heat exchanger that receives supply of a refrigerant and directly heats the air with the refrigerant. For example, the refrigerant and the heat transfer fluid are used. A first heat exchanger that exchanges heat with the second heat exchanger and a second heat exchanger that heats the air with a heat transfer fluid that has been heat-exchanged in the first heat exchanger, and indirectly injects the air with a refrigerant. You may make it heat to.

(5) In the first to third embodiments, the cooling unit 15 is configured by the heat exchanger that receives supply of the refrigerant and directly cools the outside air with the refrigerant. For example, the refrigerant and the heat transfer fluid are used. A third heat exchanger that exchanges heat with the fourth heat exchanger and a fourth heat exchanger that cools the outside air with a heat transfer fluid that has been heat exchanged with the third heat exchanger, and indirectly injects the outside air with a refrigerant. You may make it cool to.

(6) In the said 1st-3rd embodiment, although the heating part 14 and the outdoor heat exchanger 7 are connected in series in the refrigerant circuit 2, the heating part 14 and the outdoor heat exchanger 7 can also be connected in parallel. .

(7) In the first and third embodiments, the refrigerant circuit 2 is connected in series so that the plurality of indoor heat exchangers 9 and the cooling unit 15 are in this order in the refrigerant flow direction. The cooling unit 15 and the plurality of indoor heat exchangers 9 may be connected in series in the refrigerant flow direction.

  INDUSTRIAL APPLICABILITY The present invention can be applied to various air conditioning systems capable of improving dehumidification performance and energy saving performance in a highly versatile system including a plurality of indoor heat exchangers for an air conditioning target space.

DESCRIPTION OF SYMBOLS 1 Air-conditioning object space 2 Refrigerant circuit 3 Air supply path 4 Exhaust path 5 Dehumidification part (desiccant rotor)
6 Compressor 7 Outdoor heat exchanger 8 Expansion section (expansion valve)
9 Indoor heat exchanger 14 Heating unit 15 Cooling unit 15a First cooling unit 15b Second cooling unit

Claims (4)

A plurality of indoor heat exchangers are provided for the air-conditioned space,
A compressor, an outdoor heat exchanger, an expansion unit, and a refrigerant circuit for allowing a refrigerant to flow through the plurality of indoor heat exchangers;
An air supply path for supplying air outside the air conditioning target space into the air conditioning target space;
An exhaust path for exhausting the air in the air conditioning target space to the outside of the air conditioning target space;
A dehumidifying unit that adsorbs moisture in the air supplied into the air-conditioning target space in the air supply path and releases moisture to the air exhausted outside the air-conditioning target space in the exhaust path;
A heating unit that heats the air before being supplied to the dehumidifying unit in the exhaust passage by the refrigerant of the refrigerant circuit;
The air-conditioning system provided with the cooling part which cools the air supplied in the said air-conditioning object space in the said air supply path with the refrigerant | coolant of the said refrigerant circuit.   The air conditioning system according to claim 1, wherein a plurality of the indoor heat exchangers and the cooling unit are connected in series in the refrigerant circuit. As the cooling unit, a first cooling unit disposed upstream of the dehumidifying unit in the air flow direction in the air supply path and a second cooling unit disposed downstream of the dehumidifying unit are provided. And
The air conditioning system according to claim 1 or 2, wherein the first cooling unit and the second cooling unit are connected in parallel or in series in the refrigerant circuit. The compressor, the outdoor heat exchanger, the plurality of expansion sections, the plurality of indoor heat exchangers, the refrigerant circuit, the air supply path, the exhaust path, the dehumidifying section, the heating section, and the cooling section A unit device group is configured with a device group having a unit as one unit,
The air conditioning system according to any one of claims 1 to 3, wherein the air conditioning target space is divided into a plurality of zones, and one unit device group is provided for each of the plurality of zones.

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