Air conditioning system

Abstract

The present disclosure relates to an air conditioning system. The air conditioning system of the present disclosure comprises: a first duct which sends, to an indoor space, air flowing in from an outdoor space, and in which a plurality of heat exchangers are arranged; a second duct which sends to the outdoor space the air discharged from the indoor space; and a third duct which sends to the outdoor space the air flowing in from the outdoor space and in which a plurality of heat exchangers are arranged. Also, the air conditioning system comprises: a first air conditioning device which supplies refrigerant to at least one first upstream heat exchanger arranged in the first duct and a second duct heat exchanger arranged in the second duct; a second air conditioning device which supplies refrigerant to at least one third downstream heat exchanger arranged in the third duct; and a third air conditioning device which supplies refrigerant to at least one first downstream heat exchanger arranged in the first duct and at least one third upstream heat exchanger arranged in the third duct.

Description

Air conditioning system

[0001] The present disclosure relates to an air conditioning system, and more particularly, to an air conditioning system that supplies ultra-low humidity air to an indoor space through a plurality of ducts and a plurality of air conditioning devices.

[0002] Air conditioning systems, typically used in industrial settings to reduce humidity in indoor spaces, can supply dehumidified outdoor air to the indoor space. To enhance this dehumidifying performance, a dehumidifying rotor can be installed to exchange heat between the air supplied to the indoor space and the air exhausted to the outdoor space.

[0003] Additionally, recently, there has been a need for an air conditioning system to maintain an ultra-low humidity working environment where precise processes are required.

[0004] Korean Patent Publication No. KR 10-2021-0072325 A discloses an air conditioning system using a dehumidifying rotor.

[0005] However, it is difficult to maintain an ultra-low humidity level in an indoor space with an air conditioning system of this general structure.

[0006] The problem that the present disclosure seeks to solve is to provide an air conditioning system that supplies air in an ultra-low humidity state to an indoor space.

[0007] Another object of the present disclosure is to provide an air conditioning system that supplies ultra-low humidity air to an indoor space regardless of the outdoor environment.

[0008] Another object of the present disclosure is to provide an air conditioning system that simultaneously regenerates the dehumidifying rotor being used.

[0009] Another object of the present disclosure is to provide an air conditioning system that improves the performance of an outdoor heat exchanger to enhance overall heat exchange performance.

[0010] The tasks of the present disclosure are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the description below.

[0011] In order to achieve the above object, an air conditioning system according to an embodiment of the present disclosure includes a first duct that sends air introduced from an outdoor space to an indoor space and has a plurality of heat exchangers disposed therein, a second duct that sends air discharged from the indoor space to the outdoor space, and a third duct that sends air introduced from the outdoor space to the outdoor space and has a plurality of heat exchangers disposed therein. In addition, the air conditioning system includes a first air conditioning device that supplies refrigerant to at least one first duct upstream heat exchanger disposed in the first duct and a second duct heat exchanger disposed in the second duct, a second air conditioning device that supplies refrigerant to at least one third duct downstream heat exchanger disposed in the third duct, and a third air conditioning device that supplies refrigerant to at least one first duct downstream heat exchanger disposed in the first duct and at least one third duct upstream heat exchanger disposed in the third duct. Therefore, the air supplied through the first duct can be supplied to the indoor space at an ultra-low humidity through the heat exchanger of the first air conditioning unit and the heat exchanger of the third air conditioning unit.

[0012] A dehumidifying rotor is provided on the first duct and the third duct to dehumidify the air in the first duct. Accordingly, the air flowing through the first duct can be additionally dehumidified. In addition, the dehumidifying rotor can be regenerated by the air flowing through the third duct.

[0013] In the third duct, a first heating heat exchanger is arranged to heat the air flowing to the dehumidifying rotor. Accordingly, the dehumidifying rotor can be regenerated by the first heating heat exchanger.

[0014] The second air conditioning device includes a second outdoor unit in which a second compressor and a second outdoor heat exchanger are arranged, and a first additional unit that is driven by a first additional compressor and exchanges heat with the refrigerant discharged from the second outdoor unit. The first heating heat exchanger allows the refrigerant discharged from the first additional compressor to flow.

[0015] The second outdoor unit and the first additional unit use different refrigerants. The refrigerant flowing through the second outdoor unit and the refrigerant flowing through the first additional unit can undergo heat exchange in the first additional heat exchanger disposed in the first additional unit.

[0016] The refrigerant flowing through the second compressor operates at a higher pressure than the refrigerant flowing through the first additional compressor. Therefore, the first additional unit can be operated while maintaining system stability.

[0017] A heater is placed in the third duct to heat the air supplied to the dehumidifying rotor. The heater is placed between the dehumidifying rotor and the first heating heat exchanger. Therefore, the air flowing to the dehumidifying rotor can be additionally heated.

[0018] The second outdoor unit includes a heat recovery heat exchanger arranged in the third duct. The heat recovery heat exchanger is arranged downstream of the dehumidifying rotor. The heat exchange performance of the second outdoor unit, which operates as a plurality of heat exchangers, can be improved through the heat recovery heat exchanger.

[0019] The second air conditioning unit may further include a second heat recovery kit that exchanges heat between the refrigerant flowing from the second outdoor unit and the refrigerant flowing into the second outdoor unit. Accordingly, the two-phase refrigerant supplied to the outdoor unit or flowing outside the outdoor unit can be liquefied.

[0020] The second heat recovery kit includes a second internal heat exchanger that heat-exchanges the refrigerant flowing outside the second outdoor unit through the second outdoor heat exchanger with the refrigerant flowing inside the second outdoor unit. Accordingly, the two-phase refrigerant flowing into or from the second outdoor heat exchanger can be liquefied.

[0021] The third air conditioning device includes a third outdoor unit having a third compressor and a third outdoor heat exchanger and supplying refrigerant to a heat exchanger disposed in the first duct or the third duct, and a second additional unit driven by a second additional compressor, exchanging heat with refrigerant discharged from the third outdoor unit, and supplying refrigerant to a heat exchanger disposed in the third duct. Accordingly, additional heat exchangers can be disposed in the first duct and the third duct.

[0022] The second additional unit includes a second heating heat exchanger that heat-exchanges the refrigerant discharged from the second additional compressor and the air flowing through the third duct.

[0023] The second heating heat exchanger is arranged upstream of a dehumidifying rotor arranged on the first duct and the third duct to dehumidify the air in the first duct, thereby regenerating the dehumidifying rotor.

[0024] The third air conditioning device may further include a third heat recovery kit that exchanges heat between the refrigerant flowing from the third outdoor unit and the refrigerant flowing into the third outdoor unit. The two-phase refrigerant flowing into the third outdoor unit or flowing outside the third outdoor unit may be liquefied.

[0025] The third outdoor unit may include a first duct downstream heat exchanger arranged in the first duct to exchange heat with air flowing from the dehumidifying rotor.

[0026] The air conditioning system of the present invention comprises a first duct which sends air introduced from an outdoor space to an indoor space and has a plurality of heat exchangers arranged therein, a second duct which sends air discharged from the indoor space to the outdoor space, and a third duct which sends air introduced from the outdoor space to the outdoor space and has a plurality of heat exchangers arranged therein. The air conditioning system of the present invention comprises a first air conditioning device which supplies refrigerant to at least one first duct heat exchanger arranged in the first duct and a second duct heat exchanger arranged in the second duct, a second air conditioning device which supplies refrigerant to at least one heat exchanger arranged in the third duct, and a dehumidifying rotor arranged on the first duct and the third duct to dehumidify the air in the first duct. Therefore, the dehumidifying rotor can be regenerated through the third duct, and the air flowing through the first duct can be made into an ultra-low humidity state.

[0027] The first air conditioning unit includes a first outdoor unit having a first compressor and a first outdoor heat exchanger and supplying refrigerant to heat exchangers disposed in each of the first duct and the second duct. The first air conditioning unit includes a first heat recovery kit that performs heat exchange between the refrigerant flowing from the first outdoor unit and the refrigerant flowing to the first outdoor unit. Therefore, the heat dissipation performance of the outdoor heat exchanger can be improved through the first outdoor unit and the first heat recovery kit.

[0028] The second air conditioning unit includes a second outdoor unit having a second compressor and a second outdoor heat exchanger and supplying refrigerant to a plurality of heat exchangers arranged in the third duct. The second air conditioning unit includes a first additional unit that is driven by a first additional compressor and exchanges heat with the refrigerant discharged from the second outdoor unit.

[0029] The first additional unit includes a first heating heat exchanger that exchanges heat between the refrigerant discharged from the first additional compressor and the air in the third duct. Accordingly, the air flowing to the dehumidifying rotor can be heated to regenerate the dehumidifying rotor in the area arranged in the third duct.

[0030] The above first heating heat exchanger is placed upstream of the dehumidifying rotor.

[0031] The second air conditioning device further includes a second heat recovery kit that exchanges heat between the refrigerant flowing from the second outdoor unit and the refrigerant flowing to the second outdoor unit. Accordingly, the heat dissipation performance of the second outdoor heat exchanger can be improved.

[0032] Specific details of other embodiments are included in the detailed description and drawings.

[0033]

[0034] According to the air conditioning system of the present disclosure, one or more of the following effects are achieved.

[0035] First, there is an advantage in that the air flowing through the first duct can be made ultra-low humidity by using multiple ducts and multiple air conditioners.

[0036] Second, the air flowing through the first duct can be dehumidified using the first and second air conditioning units, which utilize a dehumidifying rotor and multiple heat exchangers. Furthermore, the air flowing through the third duct can be heated to regenerate the dehumidifying rotor. This also has the advantage of enabling continuous operation of the dehumidifying rotor.

[0037] Additionally, the third air conditioning unit can maintain the air supplied to the indoor space through the first duct at an ultra-low humidity level. Multiple heat exchangers can be selectively operated and switched to maintain the temperature and humidity of the air supplied to the indoor space regardless of outdoor temperature and humidity conditions.

[0038] Third, the heat recovery kit can liquefy the two-phase refrigerant flowing to or from the outdoor heat exchanger. This has the advantage of improving the heat dissipation performance of the outdoor heat exchanger and, thus, the overall heat exchange performance of the air conditioning system.

[0039] The effects of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0040] FIG. 1 is a schematic diagram of an air conditioning system according to one embodiment of the present disclosure.

[0041] FIG. 2 is a system diagram specifically showing the configuration of a configuration related to a first air conditioning device according to one embodiment of the present disclosure.

[0042] FIG. 3 is a system diagram specifically showing the configuration of a configuration related to a second air conditioning device according to one embodiment of the present disclosure.

[0043] FIG. 4 is a system diagram specifically showing the configuration of a configuration related to a third air conditioning device according to one embodiment of the present disclosure.

[0044] FIG. 5 is a drawing for explaining the flow of refrigerant in an air conditioning system according to one embodiment of the present disclosure operating in the summer season.

[0045] FIG. 6 is a drawing for explaining the flow of refrigerant in an air conditioning system according to one embodiment of the present disclosure operating in a general winter season.

[0046] FIG. 7 is a drawing for explaining the flow of refrigerant in an air conditioning system according to one embodiment of the present disclosure operating in a low-temperature winter season.

[0047] FIG. 8 is a drawing for explaining the flow of refrigerant in an air conditioning system operating in the inter-season according to one embodiment of the present disclosure.

[0048] Figure 9 is a schematic diagram of an air conditioning system according to another embodiment of the present disclosure.

[0049]

[0050] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided solely to ensure that the present disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0051] Terms that include ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by these terms. These terms are used solely to distinguish one component from another.

[0052] Hereinafter, an air conditioning system according to embodiments of the present disclosure will be described with reference to drawings.

[0053] Referring to Fig. 1, the overall air conditioning system of the present disclosure is described.

[0054] The air conditioning system includes a first duct (400) that sends air flowing in from an outdoor space to an indoor space. A plurality of heat exchangers are arranged in the first duct (400). A first fan (402) that supplies air to the indoor space may be arranged in the first duct (400).

[0055] At least one first duct upstream heat exchanger (160, 162, or 'first duct heat exchanger') of the first air conditioning device (100) described below may be arranged in the first duct (400). At least one first duct downstream heat exchanger (360, 362) of the third air conditioning device (300) described below may be arranged in the first duct (400).

[0056] The air flowing through the first duct (400) can sequentially flow through the first duct upstream heat exchanger (160, 162) and the first duct downstream heat exchanger (360, 362).

[0057] A dehumidifying rotor (424) that exchanges heat with air flowing through a third duct (420), which will be described below, may be placed in the first duct (400). The dehumidifying rotor (424) may be placed between the first duct upstream heat exchanger (160, 162) and the first duct downstream heat exchanger (360, 362).

[0058] The dehumidifying rotor (424) can remove moisture from flowing air using a hygroscopic material.

[0059] The dehumidifying rotor (424) can be regenerated by the air flowing through the third duct (420). The dehumidifying rotor (424) can regenerate the air flowing through the first duct (400).

[0060] The air conditioning system includes a second duct (410) that sends air flowing into the indoor space to the outdoor space.

[0061] At least one heat exchanger may be arranged in the second duct (410). A second fan (412) for discharging air to the external space may be arranged in the second duct (410). A second fan (412) for discharging air from the indoor space to the external space may be arranged in the second duct (410).

[0062] In the second duct (410), a second duct heat exchanger (164) of the first air conditioning device (100) may be placed. Air flowing through the second duct (410) by the second fan (412) may be discharged to the external space through the second duct heat exchanger (164).

[0063] The air conditioning system includes a third duct (420) that exchanges heat with air in the external space and discharges it to the external space.

[0064] A plurality of heat exchangers for heat exchange with air brought in from the external space are arranged in the third duct (420). A third fan (422) for bringing in air from the external space and sending it to the external space may be arranged in the third duct (420).

[0065] At least one third upstream heat exchanger (364, 366) of the third air conditioning unit (300) may be arranged in the third duct (420). A plurality of third duct downstream heat exchangers (260, 262, 264) of the second air conditioning unit (200) may be arranged in the third duct (420).

[0066] The air flowing through the third duct (420) can sequentially flow through the third upstream heat exchanger (364, 366) and the third duct downstream heat exchanger (260, 262, 264).

[0067] A dehumidifying rotor (424) that exchanges heat with the air flowing through the first duct (400) may be placed in the third duct (420). The dehumidifying rotor (424) may be placed between a plurality of third duct downstream heat exchangers (260, 262, 264).

[0068] A heater (426) for heating the air flowing through the third duct (420) may be placed in the third duct (420). The heater (426) may be supplied with power to heat the air flowing through the third duct (420). The heater (426) may be placed between a plurality of third duct downstream heat exchangers (260, 262, 264). The heater (426) may be placed upstream of the dehumidifying rotor (424).

[0069] The air conditioning system includes a first bypass pipe (430) connecting the first duct (400) and the second duct (410).

[0070] Air flowing through the second duct (410) can flow to the first duct (400) through the first bypass pipe (430). The first bypass pipe (430) is connected to the second duct (410) in an upstream region of the second duct heat exchanger (164). The first bypass pipe (430) is connected to the first duct (400) in an upstream region of the first duct upstream heat exchanger (160, 162).

[0071] That is, air flowing into the second duct (410) from the indoor space can flow to the upstream end of the first duct (400) through the first bypass pipe (430). The air flowing into the first duct (400) through the first bypass pipe (430) may be air that has not undergone heat exchange within the second duct (410).

[0072] Inside the first bypass pipe (430), a first bypass pipe valve (432) is arranged to open and close the internal flow path of the first bypass pipe (430).

[0073] The air conditioning system includes a second bypass pipe (440) connecting the first duct (400) and the third duct (420).

[0074] Air flowing through the first duct (400) can flow to the third duct (420) through the second bypass pipe (440). The second bypass pipe (440) is connected to the third duct (420) in the upstream region of the third upstream heat exchanger (364, 366). The second bypass pipe (440) is connected to the first duct (400) between a plurality of first duct downstream heat exchangers (360, 362) arranged in the first duct (400).

[0075] That is, air that has passed through multiple heat exchangers while flowing through the first duct (400) can flow to the upstream end of the third duct (420) through the second bypass pipe (440).

[0076] Inside the second bypass pipe (440), a second bypass pipe valve (442) is arranged to open and close the internal flow path of the second bypass pipe (440).

[0077] The air conditioning system includes a first air conditioning unit (100) that operates as a first compressor (112) and supplies refrigerant to a plurality of heat exchangers arranged in each of the first duct (400) and the second duct (410).

[0078] The first air conditioning device (100) includes a first duct upstream heat exchanger (160, 162) arranged in the first duct (400). The first duct upstream heat exchanger (160, 162) includes a 1-1 duct upstream heat exchanger (160) and a 1-2 duct upstream heat exchanger (162) arranged downstream of the 1-1 duct upstream heat exchanger (160).

[0079] The 1-1 duct upstream heat exchanger (160) is positioned closer to the intake side of the 1st duct (400) than the 1-2 duct upstream heat exchanger (162). Therefore, air introduced through the intake side of the 1st duct (400) can sequentially pass through the 1-1 duct upstream heat exchanger (160) and the 1-2 duct upstream heat exchanger (162).

[0080] The first air conditioning device (100) includes a second duct heat exchanger (164) arranged in the second duct (410).

[0081] The air conditioning system includes a second air conditioning unit (200) that operates as a second compressor (212) and supplies refrigerant to a plurality of heat exchangers arranged in a third duct (420).

[0082] The second air conditioning device (200) includes a third duct downstream heat exchanger (260, 262, 264) arranged downstream of the third duct (420). The third duct downstream heat exchanger (260, 262, 264) includes a first auxiliary heat exchanger (260), a first heating heat exchanger (262) arranged downstream of the first auxiliary heat exchanger (260), and a heat recovery heat exchanger (264) arranged downstream of the first heating heat exchanger (262).

[0083] The heat recovery heat exchanger (264) is positioned closer to the discharge port side of the third duct (420) than the first heating heat exchanger (262). The first heating heat exchanger (262) is positioned closer to the discharge port side of the third duct (420) than the first auxiliary heat exchanger (260).

[0084] Accordingly, the air flowing in through the intake of the third duct (420) can sequentially pass through the first auxiliary heat exchanger (260), the first heating heat exchanger (262), and the heat recovery heat exchanger (264).

[0085] A dehumidifying rotor (424) may be placed between the first heating heat exchanger (262) and the heat recovery heat exchanger (264). A heater (426) may be placed between the first heating heat exchanger (262) and the heat recovery heat exchanger (264).

[0086] The air conditioning system includes a third air conditioning unit (300) that operates as a third compressor (312) and supplies refrigerant to a plurality of heat exchangers arranged in each of the first duct (400) and the third duct (420).

[0087] The third air conditioning device (300) includes a first duct downstream heat exchanger (360, 362) arranged in a first duct (400). The first duct downstream heat exchanger (360, 362) is arranged downstream of the first duct upstream heat exchanger (160, 162) within the first duct (400). Therefore, air passing through the first duct upstream heat exchanger (160, 162) flows to the first duct downstream heat exchanger (360, 362).

[0088] The first duct downstream heat exchanger (360, 362) includes a first-first duct downstream heat exchanger (360) and a first-second duct downstream heat exchanger (362) positioned downstream of the first-first duct downstream heat exchanger (360).

[0089] The 1-2 duct downstream heat exchanger (362) is positioned closer to the discharge port side of the 1st duct (400) than the 1-1 duct downstream heat exchanger (360). Therefore, air introduced through the intake port of the 1st duct (400) can sequentially pass through the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362).

[0090] A second bypass pipe (440) may be placed between the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362).

[0091] The third air conditioning device (300) includes a third upstream heat exchanger (364, 366) arranged in a third duct (420). The third upstream heat exchanger (364, 366) includes a second auxiliary heat exchanger (364) and a second heating heat exchanger (366) arranged downstream of the second auxiliary heat exchanger (364).

[0092] The second auxiliary heat exchanger (364) is positioned closer to the intake side of the third duct (420) than the second heating heat exchanger (366). Therefore, air introduced through the intake side of the third duct (420) can sequentially pass through the second auxiliary heat exchanger (364) and the second heating heat exchanger (366).

[0093] The air that has passed through the third upstream heat exchanger (364, 366) flows toward the third duct downstream heat exchanger (260, 262, 264).

[0094] A second bypass pipe (440) may be placed on the upstream side of the third upper stream heat exchanger (364, 366).

[0095] Referring to Fig. 2, the specific configuration of the first air conditioning device (100) and the connection relationship with the first duct (400) and the second duct (410) are described.

[0096] The first air conditioning device (100) includes a first outdoor unit (110) in which a first compressor (112) and a first outdoor heat exchanger (114) are arranged, and a first heat recovery kit (130) that exchanges heat between refrigerant flowing from the first outdoor unit (110) and refrigerant flowing to the first outdoor unit (110) or changes the flow direction of the refrigerant.

[0097] The first air conditioning device (100) includes a first-first duct upstream heat exchanger (160) arranged in the first duct (400), a first-second duct upstream heat exchanger arranged in the first duct (400), and a second duct heat exchanger (164) arranged in the second duct (410).

[0098] The first outdoor unit (110) includes a first compressor (112). The first outdoor unit (110) includes a first outdoor heat exchanger (114) that exchanges heat between refrigerant flowing from the first compressor (112) and outdoor air.

[0099] The first outdoor unit (110) includes a first accumulator (122) that supplies gaseous refrigerant to the first compressor (112). The first outdoor unit (110) includes a first switching valve (118, 120) that sends the refrigerant flowing from the first compressor (112) to the first outdoor heat exchanger (114) or outside the first outdoor unit (110).

[0100] The first outdoor unit (110) includes a first-to-first switching valve (118) that sends the refrigerant flowing from the first compressor (112) to the first outdoor heat exchanger (114) or sends the refrigerant flowing from the first outdoor heat exchanger (114) to the first compressor (112). The first outdoor unit (110) includes a first-to-second switching valve (120) that sends the refrigerant flowing from the first compressor (112) to the outside of the first outdoor unit (110).

[0101] The first outdoor unit (110) includes a first outdoor expansion valve (116) that expands refrigerant flowing from or to the first outdoor heat exchanger (114).

[0102] The first outdoor expansion valve (116) can expand the liquid refrigerant flowing to the first outdoor heat exchanger (114). The first outdoor expansion valve (116) can expand the liquid refrigerant flowing from the first outdoor heat exchanger (114).

[0103] The first heat recovery kit (130) includes a first internal heat exchanger (132) that exchanges heat between the refrigerant flowing outside the first outdoor unit (110) through the first outdoor heat exchanger (114) and the refrigerant flowing inside the first outdoor unit (110).

[0104] The first heat recovery kit (130) includes a first internal switching valve (134) that sends the refrigerant discharged from the first outdoor unit (110) to the second duct heat exchanger (164) or the first duct upstream heat exchanger (160, 162).

[0105] The first internal switching valve (134) can send the high-pressure refrigerant discharged from the first compressor (112) to the second duct heat exchanger (164). In addition, the first internal switching valve (134) can send the high-pressure refrigerant discharged from the first compressor (112) to the first-second duct upstream heat exchanger (162).

[0106] The first air conditioning device (100) includes a first expansion valve (170, 172, 174) that expands refrigerant flowing through a heat exchanger arranged in the first duct (400) or the second duct (410). The first air conditioning device (100) includes a first-first expansion valve (170) that expands refrigerant flowing to the first-first duct upstream heat exchanger (160). The first air conditioning device (100) includes a first-second expansion valve (172) that expands refrigerant flowing to the first-second duct upstream heat exchanger (162) or refrigerant flowing from the first-second duct upstream heat exchanger (162). The first air conditioning device (100) includes a first-third expansion valve (174) that expands the refrigerant flowing to the second duct heat exchanger (164).

[0107] Referring to FIG. 3, the specific configuration of the second air conditioning device (200) and the connection relationship with the first duct (400) and the third duct (420) are described.

[0108] The second air conditioning device (200) includes a second outdoor unit (210) in which a second compressor (212) and a second outdoor heat exchanger (214) are arranged, and a second heat recovery kit (230) that exchanges heat between refrigerant flowing from the second outdoor unit (210) and refrigerant flowing to the second outdoor unit (210) or changes the flow direction of the refrigerant.

[0109] The second air conditioning unit (200) includes a first additional unit (240) that exchanges heat with the refrigerant discharged from the second outdoor unit (210) and includes a first additional compressor (242).

[0110] The second air conditioning device (200) includes a first auxiliary heat exchanger (260) arranged in the third duct (420), a first heating heat exchanger (262) arranged in the third duct (420), and a heat recovery heat exchanger (264) arranged in the third duct (420).

[0111] The second outdoor unit (210) includes a second compressor (212). The second outdoor unit (210) includes a second outdoor heat exchanger (214) that exchanges heat between refrigerant flowing from the second compressor (212) and outdoor air.

[0112] The second outdoor unit (210) includes a second accumulator (224) that supplies gaseous refrigerant to the second compressor (212). The second outdoor unit (210) includes a second switching valve (218, 220) that sends the refrigerant flowing from the second compressor (212) to the second outdoor heat exchanger (214) or outside the second outdoor unit (210).

[0113] The second outdoor unit (210) includes a second-1 switching valve (218) that sends the refrigerant flowing from the second compressor (212) to the second outdoor heat exchanger (214) or sends the refrigerant flowing from the second outdoor heat exchanger (214) to the second compressor (212). The second outdoor unit (210) includes a second-2 switching valve (220) that sends the refrigerant flowing from the second compressor (212) to the outside of the second outdoor unit (210).

[0114] The second outdoor unit (210) includes a second outdoor expansion valve (216) that expands refrigerant flowing from or to the second outdoor heat exchanger (214).

[0115] The second outdoor expansion valve (216) can expand the liquid refrigerant flowing to the second outdoor heat exchanger (214). The second outdoor expansion valve (216) can expand the liquid refrigerant flowing from the second outdoor heat exchanger (214).

[0116] The second heat recovery kit (230) includes a second internal heat exchanger (232) that exchanges heat between the refrigerant flowing outside the second outdoor unit (210) through the second outdoor heat exchanger (214) and the refrigerant flowing from the outside of the second outdoor unit (210) to the second compressor (212).

[0117] The second heat recovery kit (230) includes a second internal switching valve (234) that sends the refrigerant discharged from the second outdoor unit (210) to the first additional heat exchanger (244) or the third duct downstream heat exchanger (260, 262, 264).

[0118] The second internal switching valve (234) can send the high-pressure refrigerant discharged from the second compressor (212) to the first additional heat exchanger (244). In addition, the second internal switching valve (234) can send the high-pressure refrigerant discharged from the second compressor (212) to the first auxiliary heat exchanger (260). The second internal switching valve (234) can send the high-pressure refrigerant discharged from the second compressor (212) to the first additional heat exchanger (244) and the first auxiliary heat exchanger (260), respectively.

[0119] The first additional unit (240) includes a first additional compressor (242), and a first additional heat exchanger (244) that exchanges heat between the refrigerant flowing from the first additional compressor (242) and the refrigerant flowing from the second outdoor unit (210). The first additional heat exchanger (244) may use a plate heat exchanger.

[0120] The refrigerant discharged from the first additional compressor (242) flows to the first heating heat exchanger (262).

[0121] The first additional unit (240) includes a first additional accumulator (248) that supplies gaseous refrigerant to the first additional compressor (242).

[0122] The first additional unit (240) includes a first liquid refrigerant extractor (250) that supplies liquid refrigerant to the first additional heat exchanger (244). The first liquid refrigerant extractor (250) can separate the refrigerant flowing from the first heating heat exchanger (262). The first liquid refrigerant extractor (250) can separate the refrigerant flowing from the first heating heat exchanger (262) into a gaseous refrigerant and a liquid refrigerant. The first liquid refrigerant extractor (250) supplies the liquid refrigerant to the first additional heat exchanger (244). The first liquid refrigerant extractor (250) sends the gaseous refrigerant to the first additional accumulator (248).

[0123] The first additional unit (240) includes a first-first additional expansion valve (252) that expands the refrigerant flowing from the first heating heat exchanger (262).

[0124] The first additional unit (240) includes a first-second additional expansion valve (254) that expands the refrigerant flowing from the first liquid refrigerant extractor (250).

[0125] The first additional unit (240) includes a first check valve (246) that prevents liquid refrigerant from flowing from the first heating heat exchanger (262) to the first additional compressor (242). The first check valve (246) can block the liquid refrigerant from flowing from the first heating heat exchanger (262) to the first additional compressor (242) when the operation of the first additional compressor (242) is stopped.

[0126] The second air conditioning device (200) includes a second expansion valve (270, 272, 274) that expands refrigerant flowing through a heat exchanger arranged in the third duct (420) or the first additional unit (240).

[0127] The second air conditioning unit (200) includes a second-first expansion valve (270) that expands the refrigerant flowing from the first auxiliary heat exchanger (260). The second air conditioning unit (200) includes a second-second expansion valve (272) that expands the refrigerant flowing into the heat recovery heat exchanger (264). The second air conditioning unit (200) includes a second-third expansion valve (274) that expands the refrigerant flowing into the refrigerant flowing from the first additional heat exchanger (244).

[0128] The second air conditioning device (200) includes a first solenoid valve (280) that controls the flow of refrigerant flowing to the first auxiliary heat exchanger (260).

[0129] The second compressor (212) and the first additional compressor (242) may use different refrigerants. The refrigerant used in the second compressor (212) may have a higher operating pressure than the refrigerant used in the first additional compressor (242). That is, the refrigerant used in the second compressor (212) may be a refrigerant that operates at a higher pressure than the refrigerant used in the first additional compressor (242). For example, the second compressor (212) may use R410A refrigerant, and the first additional compressor (242) may use R134a refrigerant.

[0130] Referring to Fig. 4, the specific configuration of the third air conditioning device (300) and the connection relationship with the first duct (400) and the third duct (420) are described.

[0131] The third air conditioning device (300) includes a third outdoor unit (310) in which a third compressor (312) and a third outdoor heat exchanger (314) are arranged, and a third heat recovery kit (330) that exchanges heat between refrigerant flowing from the third outdoor unit (310) and refrigerant flowing to the third outdoor unit (310) or changes the flow direction of the refrigerant.

[0132] The third air conditioning unit (300) includes a second additional unit (340) that exchanges heat with the refrigerant discharged from the third outdoor unit (310) and includes a second additional compressor (342).

[0133] The third air conditioning device (300) includes a third upstream heat exchanger (364, 366) arranged in a third duct (420) and a first duct downstream heat exchanger (360, 362) arranged in a first duct (400).

[0134] The third upstream heat exchanger (364, 366) includes a second auxiliary heat exchanger (364) and a second heating heat exchanger (366) arranged downstream of the second auxiliary heat exchanger (364). The first duct downstream heat exchanger (360, 362) includes a first-first duct downstream heat exchanger (360) and a first-second duct downstream heat exchanger (362) arranged downstream of the first-first duct downstream heat exchanger (360).

[0135] The third outdoor unit (310) includes a third compressor (312). The third outdoor unit (310) includes a third outdoor heat exchanger (314) that exchanges heat between refrigerant flowing from the third compressor (312) and outdoor air.

[0136] The third outdoor unit (310) includes a third accumulator (322) that supplies gaseous refrigerant to the third compressor (312). The third outdoor unit (310) includes a third switching valve (318, 320) that sends the refrigerant flowing from the third compressor (312) to the third outdoor heat exchanger (314) or outside the third outdoor unit (310).

[0137] The third outdoor unit (310) includes a third-1 switching valve (318) that sends the refrigerant flowing from the third compressor (312) to the third outdoor heat exchanger (314) or sends the refrigerant flowing from the third outdoor heat exchanger (314) to the third compressor (312). The third outdoor unit (310) includes a third-2 switching valve (320) that sends the refrigerant flowing from the third compressor (312) to the outside of the third outdoor unit (310).

[0138] The third outdoor unit (310) includes a third outdoor expansion valve (316) that expands refrigerant flowing from or to the third outdoor heat exchanger (314).

[0139] The third outdoor expansion valve (316) can expand the liquid refrigerant flowing to the third outdoor heat exchanger (314). The third outdoor expansion valve (316) can expand the liquid refrigerant flowing from the third outdoor heat exchanger (314).

[0140] The third heat recovery kit (330) includes a third internal heat exchanger (332) that heat-exchanges the refrigerant flowing outside the third outdoor unit (310) through the third outdoor heat exchanger (314) and the refrigerant flowing from outside the third outdoor unit (310) to the third compressor (312).

[0141] The third internal heat exchanger (332) can exchange heat between the refrigerant flowing from the first-first duct downstream heat exchanger (360) to the third compressor (312) and the refrigerant flowing from the third compressor (312) to the second additional heat exchanger (344).

[0142] After the refrigerant flowing from the 1-2 duct downstream heat exchanger (362) is added to the refrigerant flowing from the 1-1 duct downstream heat exchanger (360), it can flow to the 3rd internal heat exchanger (332).

[0143] A portion of the refrigerant flowing from the third internal heat exchanger (332) to the second additional heat exchanger (344) may flow to the second auxiliary heat exchanger (364).

[0144] The third heat recovery kit (330) includes a third internal switching valve (334) that sends the refrigerant discharged from the third outdoor unit (310) to the second additional heat exchanger (344), the first duct downstream heat exchanger (360, 362), or the third upstream heat exchanger (364, 366).

[0145] The third internal switching valve (334) can send the high-pressure refrigerant discharged from the third compressor (312) to the second additional heat exchanger (344) or the second auxiliary heat exchanger (364). The third internal switching valve (334) can send the high-pressure refrigerant discharged from the third compressor (312) to the second additional heat exchanger (344) and the second auxiliary heat exchanger (364), respectively.

[0146] The third internal switching valve (334) can send the high-pressure refrigerant discharged from the third compressor (312) to the first-second duct downstream heat exchanger (362).

[0147] The second additional unit (340) includes a second additional compressor (342), and a second additional heat exchanger (344) that exchanges heat between the refrigerant flowing from the second additional compressor (342) and the refrigerant flowing from the third outdoor unit (310). The second additional heat exchanger (344) may use a plate heat exchanger.

[0148] The refrigerant discharged from the second additional compressor (342) can flow to the second heating heat exchanger (366).

[0149] The second additional unit (340) includes a second additional accumulator (348) that supplies gaseous refrigerant to the second additional compressor (342).

[0150] The second additional unit (340) includes a second liquid refrigerant extractor (350) that supplies liquid refrigerant to the second additional heat exchanger (344). The second liquid refrigerant extractor (350) can separate the refrigerant flowing from the second heating heat exchanger (366).

[0151] The second liquid refrigerant extractor (350) can separate the refrigerant flowing from the second heating heat exchanger (366) into gaseous refrigerant and liquid refrigerant. The second liquid refrigerant extractor (350) supplies the liquid refrigerant to the second additional heat exchanger (344). The second liquid refrigerant extractor (350) sends the gaseous refrigerant to the second additional accumulator (348).

[0152] The second additional unit (340) includes a second-first additional expansion valve (352) that expands the refrigerant flowing from the second heating heat exchanger (366).

[0153] The second additional unit (340) includes a second-second additional expansion valve (354) that expands the refrigerant flowing from the second liquid refrigerant extractor (350).

[0154] The second additional unit (340) includes a second check valve (346) that prevents liquid refrigerant from flowing from the second heating heat exchanger (366) to the second additional compressor (342). The second check valve (346) can block the liquid refrigerant from flowing from the second heating heat exchanger (366) to the second additional compressor (342) when the operation of the second additional compressor (342) is stopped.

[0155] The third air conditioning device (300) includes a third expansion valve (370, 372, 374, 376) that expands refrigerant flowing through a heat exchanger disposed in the first duct (400), the third duct (420), or the first additional unit (240).

[0156] The third air conditioning unit (300) includes a third-first expansion valve (370) that expands the refrigerant flowing from the second auxiliary heat exchanger (364). The third air conditioning unit (300) includes a third-second expansion valve (372) that expands the refrigerant flowing into the refrigerant flowing into the first-first duct downstream heat exchanger (360). The third air conditioning unit (300) includes a third-third expansion valve (374) that expands the refrigerant flowing into the first-second duct downstream heat exchanger (362). The third air conditioning unit (300) includes a third-fourth expansion valve (376) that expands the refrigerant flowing into the refrigerant flowing from the second additional heat exchanger (344).

[0157] The third air conditioning device (300) includes a second solenoid valve (380) that controls the flow of refrigerant flowing to the second auxiliary heat exchanger (364).

[0158] The third compressor (312) and the second additional compressor (342) may use different refrigerants. The refrigerant used in the third compressor (312) may have a higher operating pressure than the refrigerant used in the second additional compressor (342).

[0159] Hereinafter, with reference to FIG. 5, the operation of the air conditioning system of the present invention operating in the summer season will be described.

[0160] First, the operation of multiple heat exchangers based on the duct is explained.

[0161] In summer, outdoor air can be hot and humid. During summer, outdoor temperatures can reach above 23 degrees Celsius.

[0162] The first duct (400) allows air from the outdoor space to flow in and supplies air to the indoor space.

[0163] The first duct upstream heat exchanger (160, 162) and the first duct downstream heat exchanger (360, 362) arranged in the first duct (400) each operate as an evaporator. The first-1 duct upstream heat exchanger (160) and the first-2 duct upstream heat exchanger (162) arranged in the first duct (400) operate as an evaporator. The first-1 duct downstream heat exchanger (360) and the first-2 duct downstream heat exchanger (362) arranged in the first duct (400) operate as an evaporator.

[0164] The dehumidifying rotor (424) can exchange heat between the cooled air flowing through the first duct (400) and the heated air flowing through the third duct (420).

[0165] The air flowing through the first duct (400) can be cooled by sequentially passing through the 1-1 duct upstream heat exchanger (160) and the 1-2 duct upstream heat exchanger (162). That is, the air flowing into the first duct (400) can have its moisture primarily removed by sequentially passing through the 1-1 duct upstream heat exchanger (160) and the 1-2 duct upstream heat exchanger (162).

[0166] The air flowing through the first duct (400) can have its moisture removed secondarily by passing through the dehumidifying rotor (424). In addition, the temperature of the air flowing through the first duct (400) can rise to some extent while passing through the dehumidifying rotor (424).

[0167] The air flowing through the first duct (400) can be cooled by sequentially passing through the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362). That is, the air flowing through the first duct (400) can have moisture removed in a third step by sequentially passing through the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362).

[0168] That is, the air flowing inside the first duct (400) can be converted to an ultra-low humidity state and supplied to the indoor space. In the summer, the humid air in the outdoor space can be supplied to the indoor space with the humidity reduced to the maximum by passing through the first duct (400). That is, in the summer, the air introduced into the first duct (400) with an absolute humidity of 10 g / m3 or more can be supplied to the indoor space with an absolute humidity of 2 g / m3 or less.

[0169] The second duct (410) allows air from the indoor space to flow in. The second duct (410) can discharge air to the outdoor space.

[0170] The second duct heat exchanger (164) placed in the second duct (410) operates as a condenser.

[0171] The air flowing through the second duct (410) can be heated through the second duct heat exchanger (164) and then discharged to the outdoor space.

[0172] The third duct (420) allows air from the outdoor space to flow in. The third duct (420) can discharge air to the outdoor space.

[0173] The third upper heat exchanger (364, 366) placed in the third duct (420) can be operated as a condenser.

[0174] The second auxiliary heat exchanger (364) arranged in the third duct (420) can be operated as a condenser or stopped. The second auxiliary heat exchanger (364) can be operated as a condenser when the second additional unit (340) does not operate normally, by opening the flow path of the second solenoid valve (380). That is, when the refrigerant supply to the second heating heat exchanger (366) is not smooth, the second solenoid valve (380) can open the flow path, by which the second auxiliary heat exchanger (364) can be operated as a condenser.

[0175] The second auxiliary heat exchanger (364) can be stopped from operating when the second additional unit (340) is operating normally by closing the flow path of the second solenoid valve (380). That is, when the refrigerant supply to the second heating heat exchanger (366) is smooth, the second solenoid valve (380) can close the flow path to stop the operation of the second auxiliary heat exchanger (364).

[0176] The second heating heat exchanger (366) placed in the third duct (420) can be operated as a condenser.

[0177] The first auxiliary heat exchanger (260) and the first heating heat exchanger (262) placed in the third duct (420) can be operated as a condenser.

[0178] The first auxiliary heat exchanger (260) arranged in the third duct (420) can be operated as a condenser or stopped. When the first additional unit (240) is not operating normally, the first auxiliary heat exchanger (260) can be operated as a condenser by opening the flow path of the first solenoid valve (280).

[0179] The first auxiliary heat exchanger (260) can be stopped from operating when the first additional unit (240) is operating normally by closing the flow path through the first solenoid valve (280).

[0180] The first heating heat exchanger (262) placed in the third duct (420) can be operated as a condenser.

[0181] The heat recovery heat exchanger (264) placed in the third duct (420) can be operated as an evaporator.

[0182] The air flowing through the third duct (420) is heated by the second auxiliary heat exchanger (364) or the second heating heat exchanger (366).

[0183] Additionally, the air flowing through the third duct (420) is additionally heated by the first auxiliary heat exchanger (260) or the first heating heat exchanger (262).

[0184] In addition, the air flowing through the third duct (420) can be additionally heated by the heater (426). The air flowing through the third duct (420) is sequentially heated while passing through the second heating heat exchanger (366), the first heating heat exchanger (262), and the heater (426). The air flowing through the third duct (420) supplies the heated air to the dehumidifying rotor (424). The dehumidifying rotor (424) is arranged downstream of the heater (426). Therefore, the air flowing through the third duct (420) can regenerate the dehumidifying rotor (424).

[0185] Air passing through the dehumidifying rotor (424) can be cooled by passing through the heat recovery heat exchanger (264). Air flowing through the third duct (420) can have its temperature and humidity somewhat lowered by passing through the heat recovery heat exchanger (264).

[0186] Below, the flow of refrigerant in each of the first air conditioning unit (100), the second air conditioning unit (200), and the third air conditioning unit (300) is described.

[0187] The flow of refrigerant flowing through the first air conditioning device (100) is described.

[0188] A portion of the refrigerant discharged from the first compressor (112) flows to the first outdoor heat exchanger (114). The first outdoor heat exchanger (114) can operate as a condenser.

[0189] Another portion of the refrigerant discharged from the first compressor (112) can flow to the second duct heat exchanger (164) through the first-second switching valve (120) and the first internal switching valve (134). Therefore, the second duct heat exchanger (164) can be operated as a condenser.

[0190] The refrigerant flowing through the first outdoor heat exchanger (114) can flow to the first-1 duct upstream heat exchanger (160) and the first-2 duct upstream heat exchanger (162). At this time, the refrigerant flowing from the first outdoor heat exchanger (114) can increase the liquid ratio of the refrigerant by passing through the first internal heat exchanger (132).

[0191] Additionally, the refrigerant flowing from the second duct heat exchanger (164) can also flow to the first-first duct upstream heat exchanger (160) and the first-second duct upstream heat exchanger (162).

[0192] The 1-1 duct upstream heat exchanger (160) and the 1-2 duct upstream heat exchanger (162) can be operated as evaporators.

[0193] The refrigerant flowing from the 1-1 duct upstream heat exchanger (160) and the 1-2 duct upstream heat exchanger (162) can flow to the first compressor (112) through the first internal heat exchanger (132).

[0194] The flow of refrigerant flowing through the second air conditioning unit (200) is described.

[0195] The refrigerant flowing through the second compressor (212) may be referred to as the first refrigerant. The refrigerant flowing through the first additional compressor (242) may be referred to as the second refrigerant. The refrigerant flowing through the first compressor (112) may also be the first refrigerant.

[0196] A portion of the first refrigerant discharged from the second compressor (212) flows to the second outdoor heat exchanger (214). The second outdoor heat exchanger (214) can be operated as a condenser.

[0197] Another portion of the first refrigerant discharged from the second compressor (212) may flow to the first additional heat exchanger (244) through the second-to-second switching valve (220) and the second internal switching valve (234). Another portion of the first refrigerant discharged from the second compressor (212) may flow to the first auxiliary heat exchanger (260) through the second-to-second switching valve (220) and the second internal switching valve (234).

[0198] The first refrigerant flowing from the second outdoor heat exchanger (214) can flow to the heat recovery heat exchanger (264) via the second internal heat exchanger (232). The first refrigerant flowing from the second outdoor heat exchanger (214) can increase the proportion of liquid refrigerant by passing through the second internal heat exchanger (232).

[0199] The first refrigerant discharged from the first additional heat exchanger (244) can also flow to the heat recovery heat exchanger (264).

[0200] The heat recovery heat exchanger (264) can be operated as an evaporator. The first refrigerant flowing from the heat recovery heat exchanger (264) can flow to the second compressor (212) through the second internal heat exchanger (232).

[0201] The second refrigerant discharged from the first additional compressor (242) flows to the first heating heat exchanger (262). The first heating heat exchanger (262) can be operated as a condenser.

[0202] The second refrigerant discharged from the first heating heat exchanger (262) can flow to the first additional compressor (242) through the first additional heat exchanger (244). In the first additional heat exchanger (244), the first refrigerant and the second refrigerant can exchange heat.

[0203] The flow of refrigerant flowing through the third air conditioning device (300) is described.

[0204] The refrigerant flowing through the third compressor (312) may be referred to as the first refrigerant. The refrigerant flowing through the second additional compressor (342) may be referred to as the second refrigerant. The first refrigerant flowing through the third compressor (312) may use the same refrigerant as the refrigerant flowing through the second compressor (212). The second refrigerant flowing through the second additional compressor (342) may also use the same refrigerant as the refrigerant flowing through the first additional compressor (242).

[0205] A portion of the first refrigerant discharged from the third compressor (312) flows to the third outdoor heat exchanger (314). The third outdoor heat exchanger (314) can be operated as a condenser.

[0206] Another portion of the first refrigerant discharged from the third compressor (312) may flow to the second additional heat exchanger (344) through the third-2 switching valve (320) and the third internal switching valve (334). Another portion of the first refrigerant discharged from the third compressor (312) may flow to the second auxiliary heat exchanger (364) through the third-2 switching valve (320) and the third internal switching valve (334).

[0207] The first refrigerant flowing from the third outdoor heat exchanger (314) can flow to the first-1 duct downstream heat exchanger (360) and the first-2 duct downstream heat exchanger (362) via the third internal heat exchanger (332). The first refrigerant flowing from the third outdoor heat exchanger (314) can increase the proportion of liquid refrigerant by passing through the third internal heat exchanger (332).

[0208] The first refrigerant discharged from the second additional heat exchanger (344) can also flow to the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362). Each of the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362) can be operated as an evaporator.

[0209] The first refrigerant flowing from each of the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362) can flow to the third compressor (312) through the third internal heat exchanger (332).

[0210] The second refrigerant discharged from the second additional compressor (342) flows to the second heating heat exchanger (366). The second heating heat exchanger (366) can be operated as a condenser.

[0211] The second refrigerant discharged from the second heating heat exchanger (366) can flow to the second additional compressor (342) through the second additional heat exchanger (344). In the second additional heat exchanger (344), the first refrigerant and the second refrigerant can undergo heat exchange.

[0212] Hereinafter, with reference to FIG. 6, the operation of the air conditioning system of the present invention operating in the general winter season will be described.

[0213] The term "normal winter" can refer to an outdoor temperature of 4 degrees Celsius or higher. During normal winter, the outdoor air can be cold and humid. During normal winter, the outdoor air temperature can be below 18 degrees Celsius. Furthermore, during normal winter, the outdoor air temperature can be above 4 degrees Celsius. Furthermore, during normal winter, the humidity of the outdoor air can be higher than that of the air supplied to the indoor space.

[0214] First, the operation of multiple heat exchangers based on the duct is explained.

[0215] The first duct (400) allows air from the outdoor space to flow in and supplies air to the indoor space.

[0216] The first duct upstream heat exchanger (160, 162) and the first duct downstream heat exchanger (360, 362) arranged in the first duct (400) each operate as an evaporator. The first-1 duct upstream heat exchanger (160) and the first-2 duct upstream heat exchanger (162) arranged in the first duct (400) operate as an evaporator. The first-1 duct downstream heat exchanger (360) and the first-2 duct downstream heat exchanger (362) arranged in the first duct (400) operate as an evaporator.

[0217] The dehumidifying rotor (424) can exchange heat between the cooled air flowing through the first duct (400) and the heated air flowing through the third duct (420).

[0218] The air flowing through the first duct (400) can be cooled by sequentially passing through the 1-1 duct upstream heat exchanger (160) and the 1-2 duct upstream heat exchanger (162). That is, the air flowing into the first duct (400) can have its moisture primarily removed by sequentially passing through the 1-1 duct upstream heat exchanger (160) and the 1-2 duct upstream heat exchanger (162).

[0219] The air flowing through the first duct (400) can have its moisture removed secondarily by passing through the dehumidifying rotor (424). In addition, the temperature of the air flowing through the first duct (400) can rise to some extent while passing through the dehumidifying rotor (424).

[0220] The air flowing through the first duct (400) can be cooled by sequentially passing through the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362). That is, the air flowing through the first duct (400) can have moisture removed in a third step by sequentially passing through the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362).

[0221] The flow rate of refrigerant flowing through the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362) can be formed to be relatively small.

[0222] The air flowing inside the first duct (400) can be converted to an ultra-low humidity state and supplied to the indoor space. In the general winter season, the air from the outdoor space can be supplied to the indoor space with the humidity reduced to the maximum by passing through the first duct (400). That is, in the general winter season, the air that enters the first duct (400) with an absolute humidity of 10 g / m3 or less can be supplied to the indoor space with an absolute humidity of 2 g / m3 or less.

[0223] Additionally, in the general winter season, low-temperature air flowing from an outdoor space can be supplied to an indoor space with a raised temperature while flowing through the first duct (400).

[0224] The second duct (410) allows air from the indoor space to flow in. The second duct (410) can discharge air to the outdoor space.

[0225] The second duct heat exchanger (164) placed in the second duct (410) can be stopped.

[0226] The air flowing through the second duct (410) can be discharged to the outdoor space without separate heat exchange.

[0227] The third duct (420) allows air from the outdoor space to flow in. The third duct (420) can discharge air to the outdoor space.

[0228] The third upper heat exchanger (364, 366) placed in the third duct (420) can be operated as a condenser.

[0229] The second auxiliary heat exchanger (364) arranged in the third duct (420) can be operated as a condenser or stopped. When the second additional unit (340) is not operating normally, the second auxiliary heat exchanger (364) can be operated as a condenser by opening the flow path of the second solenoid valve (380).

[0230] The second auxiliary heat exchanger (364) can be stopped from operating when the second additional unit (340) is operating normally by closing the flow path through the second solenoid valve (380).

[0231] The second heating heat exchanger (366) placed in the third duct (420) can be operated as a condenser.

[0232] The first auxiliary heat exchanger (260) and the first heating heat exchanger (262) placed in the third duct (420) can be operated as a condenser.

[0233] The first auxiliary heat exchanger (260) arranged in the third duct (420) can be operated as a condenser or stopped. When the first additional unit (240) is not operating normally, the first auxiliary heat exchanger (260) can be operated as a condenser by opening the flow path of the first solenoid valve (280).

[0234] The first auxiliary heat exchanger (260) can be stopped from operating when the first additional unit (240) is operating normally by closing the flow path through the first solenoid valve (280).

[0235] The first heating heat exchanger (262) placed in the third duct (420) can be operated as a condenser.

[0236] The heat recovery heat exchanger (264) placed in the third duct (420) can be operated as an evaporator.

[0237] The air flowing through the third duct (420) is heated by the second auxiliary heat exchanger (364) or the second heating heat exchanger (366).

[0238] Additionally, the air flowing through the third duct (420) is additionally heated by the first auxiliary heat exchanger (260) or the first heating heat exchanger (262).

[0239] In addition, the air flowing through the third duct (420) can be additionally heated by the heater (426). The air flowing through the third duct (420) is sequentially heated while passing through the second heating heat exchanger (366), the first heating heat exchanger (262), and the heater (426). The air flowing through the third duct (420) supplies the heated air to the dehumidifying rotor (424). The dehumidifying rotor (424) is arranged downstream of the heater (426). Therefore, the air flowing through the third duct (420) can regenerate the dehumidifying rotor (424).

[0240] Air passing through the dehumidifying rotor (424) can be cooled by passing through the heat recovery heat exchanger (264). Air flowing through the third duct (420) can have its temperature and humidity somewhat lowered by passing through the heat recovery heat exchanger (264).

[0241] Below, the flow of refrigerant in each of the first air conditioning unit (100), the second air conditioning unit (200), and the third air conditioning unit (300) is described.

[0242] The flow of refrigerant flowing through the first air conditioning device (100) is described.

[0243] The refrigerant discharged from the first compressor (112) flows to the first outdoor heat exchanger (114). The first outdoor heat exchanger (114) can operate as a condenser. Unlike in the summer, all of the refrigerant discharged from the first compressor (112) flows to the first outdoor heat exchanger (114), so the amount of refrigerant flowing to the first outdoor heat exchanger (114) can increase.

[0244] The second duct heat exchanger (164) is stationary and no refrigerant flow is formed.

[0245] The refrigerant flowing through the first outdoor heat exchanger (114) can flow to the first-1 duct upstream heat exchanger (160) and the first-2 duct upstream heat exchanger (162). At this time, the refrigerant flowing from the first outdoor heat exchanger (114) can increase the liquid ratio of the refrigerant by passing through the first internal heat exchanger (132).

[0246] The 1-1 duct upstream heat exchanger (160) and the 1-2 duct upstream heat exchanger (162) can be operated as evaporators.

[0247] The refrigerant flowing from the 1-1 duct upstream heat exchanger (160) and the 1-2 duct upstream heat exchanger (162) can flow to the first compressor (112) through the first internal heat exchanger (132).

[0248] The flow of refrigerant flowing through the second air conditioning unit (200) is described.

[0249] The first refrigerant discharged from the second compressor (212) can flow to the first additional heat exchanger (244) through the second-2 switching valve (220) and the second internal switching valve (234). Another portion of the first refrigerant discharged from the second compressor (212) can flow to the first auxiliary heat exchanger (260) through the second-2 switching valve (220) and the second internal switching valve (234).

[0250] A portion of the first refrigerant discharged from the first additional heat exchanger (244) flows to the second outdoor heat exchanger (214) via the second internal heat exchanger (232). As it passes through the second internal heat exchanger (232), the proportion of liquid refrigerant in the first refrigerant flowing to the second outdoor heat exchanger (214) may increase.

[0251] The second outdoor heat exchanger (214) can be operated as an evaporator. The first refrigerant flowing from the second outdoor heat exchanger (214) can flow to the second compressor (212).

[0252] Another portion of the first refrigerant discharged from the first additional heat exchanger (244) may flow to the heat recovery heat exchanger (264). The heat recovery heat exchanger (264) may operate as an evaporator.

[0253] The first refrigerant flowing from the heat recovery heat exchanger (264) can flow to the second compressor (212) through the second internal heat exchanger (232).

[0254] The second refrigerant discharged from the first additional compressor (242) flows to the first heating heat exchanger (262). The first heating heat exchanger (262) can be operated as a condenser.

[0255] The second refrigerant discharged from the first heating heat exchanger (262) can flow to the first additional compressor (242) through the first additional heat exchanger (244).

[0256] In the first additional heat exchanger (244), the first refrigerant and the second refrigerant can exchange heat.

[0257] The amount of first refrigerant flowing into the first additional heat exchanger (244) can be increased. Accordingly, the efficiency of the second refrigerant heat-exchanged in the first additional heat exchanger (244) can be increased. Accordingly, the performance of the first heating heat exchanger (262) to which the second refrigerant is supplied from the first additional compressor (242) can be increased.

[0258] The flow of refrigerant flowing through the third air conditioning device (300) is described.

[0259] The first refrigerant discharged from the third compressor (312) can flow to the second additional heat exchanger (344) through the third-2 switching valve (320) and the third internal switching valve (334). Another portion of the first refrigerant discharged from the third compressor (312) can flow to the second auxiliary heat exchanger (364) through the third-2 switching valve (320) and the third internal switching valve (334).

[0260] A portion of the first refrigerant discharged from the second additional heat exchanger (344) may flow to the third outdoor heat exchanger (314) via the third internal heat exchanger (332). As it passes through the third internal heat exchanger (332), the proportion of liquid refrigerant in the first refrigerant flowing to the third outdoor heat exchanger (314) may increase.

[0261] The third outdoor heat exchanger (314) can be operated as an evaporator. The first refrigerant flowing from the third outdoor heat exchanger (314) can flow to the third compressor (312).

[0262] Another portion of the first refrigerant discharged from the second additional heat exchanger (344) can flow to the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362). Each of the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362) can operate as an evaporator.

[0263] As the ratio of heat exchangers used as evaporators among the heat exchangers through which the first refrigerant flows increases, the performance of each of the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362) may decrease.

[0264] The first refrigerant flowing from each of the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362) can flow to the third compressor (312) through the third internal heat exchanger (332).

[0265] The second refrigerant discharged from the second additional compressor (342) flows to the second heating heat exchanger (366). The second heating heat exchanger (366) can be operated as a condenser.

[0266] The second refrigerant discharged from the second heating heat exchanger (366) can flow to the second additional compressor (342) through the second additional heat exchanger (344). In the second additional heat exchanger (344), the first refrigerant and the second refrigerant can undergo heat exchange.

[0267] The amount of first refrigerant flowing into the second additional heat exchanger (344) can be increased. Accordingly, the efficiency of the second refrigerant heat-exchanged in the second additional heat exchanger (344) can be increased. Accordingly, the performance of the second heating heat exchanger (366) to which the second refrigerant is supplied from the second additional compressor (342) can be increased.

[0268] Hereinafter, with reference to FIG. 7, the operation of the air conditioning system of the present invention operating in the low-temperature winter season will be described.

[0269] Low-temperature winter can refer to a condition in which the outdoor temperature falls below 4 degrees Celsius. During this period, the outdoor air can be extremely cold and extremely low in humidity. During this period, the outdoor air can have a temperature below 4 degrees Celsius. Furthermore, the humidity of the outdoor air can be equal to or lower than the humidity of the air supplied to the indoor space.

[0270] Accordingly, the air supplied to the indoor space through the first duct (400) may not require a separate dehumidification process. However, since the air flowing into the first duct (400) is in an extremely low temperature state, it can be supplied to the indoor space through a heating process.

[0271] First, the operation of multiple heat exchangers based on the duct is explained.

[0272] The first duct (400) allows air from the outdoor space to flow in and supplies air to the indoor space.

[0273] Each of the first duct upstream heat exchanger (160, 162) and the first duct downstream heat exchanger (360, 362) arranged in the first duct (400) can be operated as a condenser.

[0274] One of the 1-1 duct upstream heat exchanger (160) and the 1-2 duct upstream heat exchanger (162) arranged in the 1st duct (400) can be operated as a condenser. The 1-1 duct upstream heat exchanger (160) arranged in the 1st duct (400) can be stopped from operating. The 1-2 duct upstream heat exchanger (162) arranged in the 1st duct (400) can be operated as a condenser.

[0275] One of the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362) arranged in the 1st duct (400) can be operated as a condenser. The 1-1 duct downstream heat exchanger (360) arranged in the 1st duct (400) can be stopped from operating. The 1-2 duct downstream heat exchanger (362) arranged in the 1st duct (400) can be operated as a condenser.

[0276] The dehumidifying rotor (424) may stop operating.

[0277] The air flowing through the first duct (400) can be heated by passing through the first-second duct upstream heat exchanger (162). The air flowing into the first duct (400) can be initially heated by passing through the first-second duct upstream heat exchanger (162).

[0278] The air flowing through the first duct (400) can be heated by passing through the first-second duct downstream heat exchanger (362). The air flowing through the first duct (400) can have its temperature increased by passing through the first-second duct downstream heat exchanger (362).

[0279] The air flowing inside the first duct (400) can be supplied to the indoor space while maintaining an ultra-low humidity state. That is, in the low-temperature winter season, the air introduced into the first duct (400) with an absolute humidity of 2 g / m3 or less can be supplied to the indoor space with an absolute humidity of 2 g / m3 or less.

[0280] Additionally, in the low-temperature winter season, low-temperature air flowing from the outdoor space can be supplied to the indoor space with a raised temperature while flowing through the first duct (400).

[0281] The second duct (410) allows air from the indoor space to flow in. The second duct (410) can discharge air to the outdoor space.

[0282] The second duct heat exchanger (164) placed in the second duct (410) can be stopped. Therefore, the air flowing in the second duct (410) can flow without separate heat exchange.

[0283] The third duct (420) allows air from the outdoor space to flow in. The third duct (420) can discharge air to the outdoor space.

[0284] The second heating heat exchanger (366) arranged in the third duct (420) can be operated as a condenser. The first heating heat exchanger (262) arranged in the third duct (420) can be operated as a condenser.

[0285] The heat recovery heat exchanger (264) placed in the third duct (420) can be operated as an evaporator.

[0286] The second auxiliary heat exchanger (364) disposed in the third duct (420) may be stopped from operating. The first auxiliary heat exchanger (260) disposed in the third duct (420) may be stopped from operating.

[0287] The dehumidifying rotor (424) and heater (426) placed in the third duct (420) can be stopped from operating.

[0288] The air flowing through the third duct (420) is heated as it sequentially passes through the second heating heat exchanger (366) and the first heating heat exchanger (262). In addition, it can be discharged to the outside in a partially cooled state as it passes through the heat recovery heat exchanger (264).

[0289] Additionally, it is also possible for the operation of the third duct downstream heat exchanger (260, 262, 264) placed inside the third duct (420) to be stopped.

[0290] Below, the flow of refrigerant in each of the first air conditioning unit (100), the second air conditioning unit (200), and the third air conditioning unit (300) is described.

[0291] The flow of refrigerant flowing through the first air conditioning device (100) is described.

[0292] The refrigerant discharged from the first compressor (112) can flow to the first-second duct upstream heat exchanger (162) through the first-second switching valve (120) and the first internal switching valve (134). The first-second duct upstream heat exchanger (162) can be operated as a condenser.

[0293] A portion of the refrigerant flowing from the first-second duct upstream heat exchanger (162) may flow to the first outdoor heat exchanger (114). The first outdoor heat exchanger (114) may operate as an evaporator. The refrigerant flowing from the first outdoor heat exchanger (114) may flow to the first compressor (112).

[0294] The flow of refrigerant flowing through the second air conditioning unit (200) is described.

[0295] The first refrigerant discharged from the second compressor (212) can flow to the first additional heat exchanger (244) through the second-to-second switching valve (220) and the second internal switching valve (234).

[0296] A portion of the first refrigerant discharged from the first additional heat exchanger (244) flows to the second outdoor heat exchanger (214) via the second internal heat exchanger (232). As it passes through the second internal heat exchanger (232), the proportion of liquid refrigerant in the first refrigerant flowing to the second outdoor heat exchanger (214) may increase.

[0297] The second outdoor heat exchanger (214) can be operated as an evaporator. The first refrigerant flowing from the second outdoor heat exchanger (214) can flow to the second compressor (212).

[0298] Another portion of the first refrigerant discharged from the first additional heat exchanger (244) may flow to the heat recovery heat exchanger (264). The heat recovery heat exchanger (264) may operate as an evaporator.

[0299] The first refrigerant flowing from the heat recovery heat exchanger (264) can flow to the second compressor (212) through the second internal heat exchanger (232).

[0300] The second refrigerant discharged from the first additional compressor (242) flows to the first heating heat exchanger (262). The first heating heat exchanger (262) can be operated as a condenser.

[0301] The second refrigerant discharged from the first heating heat exchanger (262) can flow to the first additional compressor (242) through the first additional heat exchanger (244).

[0302] In the first additional heat exchanger (244), the first refrigerant and the second refrigerant can exchange heat.

[0303] Additionally, it is also possible for the operation of the second air conditioning device (200) to be stopped. That is, it is also possible for the operation of the second compressor (212) and the first additional compressor (242) to be stopped.

[0304] The flow of refrigerant flowing through the third air conditioning device (300) is described.

[0305] The first refrigerant discharged from the third compressor (312) can flow to the first-second duct downstream heat exchanger (362) through the third-second switching valve (320) and the third internal switching valve (334). The first-second duct downstream heat exchanger (362) can be operated as a condenser.

[0306] A portion of the first refrigerant flowing from the first-second duct downstream heat exchanger (362) can flow to the third outdoor heat exchanger (314) through the third internal heat exchanger (332).

[0307] As it passes through the third internal heat exchanger (332), the ratio of liquid refrigerant in the first refrigerant flowing to the third outdoor heat exchanger (314) may increase.

[0308] The third outdoor heat exchanger (314) can be operated as an evaporator. The first refrigerant flowing from the third outdoor heat exchanger (314) can flow to the third compressor (312).

[0309] Another portion of the first refrigerant flowing from the first-second duct downstream heat exchanger (362) can flow to the second additional heat exchanger (344).

[0310] The first refrigerant discharged from the second additional heat exchanger (344) can flow to the third compressor (312) through the third internal heat exchanger (332).

[0311] In the second additional heat exchanger (344), the first refrigerant and the second refrigerant can exchange heat.

[0312] The second refrigerant discharged from the second additional compressor (342) flows to the second heating heat exchanger (366). The second heating heat exchanger (366) can be operated as a condenser.

[0313] The second refrigerant discharged from the second heating heat exchanger (366) can flow to the second additional compressor (342) through the second additional heat exchanger (344). In the second additional heat exchanger (344), the first refrigerant and the second refrigerant can undergo heat exchange.

[0314] Hereinafter, with reference to FIG. 8, the operation of the air conditioning system of the present invention operating in the inter-season will be described.

[0315] First, the operation of multiple heat exchangers based on the duct is explained.

[0316] During the transitional season, the air in outdoor spaces can be humid. During the transitional season, the temperature in outdoor spaces can be set to a temperature between summer and winter.

[0317] The first duct (400) allows air from the outdoor space to flow in and supplies air to the indoor space.

[0318] The first duct upstream heat exchanger (160, 162) and the first duct downstream heat exchanger (360, 362) arranged in the first duct (400) each operate as an evaporator. The first-1 duct upstream heat exchanger (160) and the first-2 duct upstream heat exchanger (162) arranged in the first duct (400) operate as an evaporator. The first-1 duct downstream heat exchanger (360) and the first-2 duct downstream heat exchanger (362) arranged in the first duct (400) operate as an evaporator.

[0319] The dehumidifying rotor (424) can exchange heat between the cooled air flowing through the first duct (400) and the heated air flowing through the third duct (420).

[0320] The air flowing through the first duct (400) can be cooled by sequentially passing through the 1-1 duct upstream heat exchanger (160) and the 1-2 duct upstream heat exchanger (162). That is, the air flowing into the first duct (400) can have its moisture primarily removed by sequentially passing through the 1-1 duct upstream heat exchanger (160) and the 1-2 duct upstream heat exchanger (162).

[0321] The air flowing through the first duct (400) can have its moisture removed secondarily by passing through the dehumidifying rotor (424). In addition, the temperature of the air flowing through the first duct (400) can rise to some extent while passing through the dehumidifying rotor (424).

[0322] The air flowing through the first duct (400) can be cooled by sequentially passing through the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362). That is, the air flowing through the first duct (400) can have moisture removed in a third step by sequentially passing through the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362).

[0323] That is, the air flowing inside the first duct (400) can be converted to an ultra-low humidity state and supplied to the indoor space. In the inter-season, the humid air in the outdoor space can be supplied to the indoor space with the humidity reduced to the maximum by passing through the first duct (400). That is, in the inter-season, the air introduced into the first duct (400) with an absolute humidity of 10 g / m3 or more can be supplied to the indoor space with an absolute humidity of 2 g / m3 or less.

[0324] The second duct (410) allows air from the indoor space to flow in. The second duct (410) can discharge air to the outdoor space.

[0325] The second duct heat exchanger (164) placed in the second duct (410) operates as a condenser.

[0326] The air flowing through the second duct (410) can be heated through the second duct heat exchanger (164) and then discharged to the outdoor space.

[0327] The third duct (420) allows air from the outdoor space to flow in. The third duct (420) can discharge air to the outdoor space.

[0328] The second auxiliary heat exchanger (364) arranged in the third duct (420) can be operated as a condenser or stopped. When the second additional unit (340) is not operating normally, the second auxiliary heat exchanger (364) can be operated as a condenser by opening the flow path of the second solenoid valve (380).

[0329] The second auxiliary heat exchanger (364) can be stopped from operating when the second additional unit (340) is operating normally by closing the flow path through the second solenoid valve (380).

[0330] The second heating heat exchanger (366) placed in the third duct (420) can be operated as a condenser.

[0331] The first auxiliary heat exchanger (260) and the first heating heat exchanger (262) placed in the third duct (420) can be operated as a condenser.

[0332] The first auxiliary heat exchanger (260) arranged in the third duct (420) can be operated as a condenser or stopped. When the first additional unit (240) is not operating normally, the first auxiliary heat exchanger (260) can be operated as a condenser by opening the flow path of the first solenoid valve (280).

[0333] The first auxiliary heat exchanger (260) can be stopped from operating when the first additional unit (240) is operating normally by closing the flow path through the first solenoid valve (280).

[0334] The first heating heat exchanger (262) placed in the third duct (420) can be operated as a condenser.

[0335] The heat recovery heat exchanger (264) placed in the third duct (420) can be operated as an evaporator.

[0336] The air flowing through the third duct (420) is heated by the second heating heat exchanger (366).

[0337] Additionally, the air flowing through the third duct (420) is additionally heated by the first heating heat exchanger (262).

[0338] Additionally, the air flowing through the third duct (420) can be additionally heated by the heater (426) and the dehumidifying rotor (424).

[0339] The dehumidifying rotor (424) is placed downstream of the heater (426). Therefore, the air flowing through the third duct (420) can regenerate the dehumidifying rotor (424).

[0340] Air passing through the dehumidifying rotor (424) can be cooled by passing through the heat recovery heat exchanger (264). Air flowing through the third duct (420) can have its temperature and humidity somewhat lowered by passing through the heat recovery heat exchanger (264).

[0341] Below, the flow of refrigerant in each of the first air conditioning unit (100), the second air conditioning unit (200), and the third air conditioning unit (300) is described.

[0342] The flow of refrigerant flowing through the first air conditioning device (100) is described.

[0343] A portion of the refrigerant discharged from the first compressor (112) flows to the first outdoor heat exchanger (114). The first outdoor heat exchanger (114) can operate as a condenser.

[0344] Another portion of the refrigerant discharged from the first compressor (112) can flow to the second duct heat exchanger (164) through the first-second switching valve (120) and the first internal switching valve (134). Therefore, the second duct heat exchanger (164) can be operated as a condenser.

[0345] The refrigerant flowing through the first outdoor heat exchanger (114) can flow to the first-1 duct upstream heat exchanger (160) and the first-2 duct upstream heat exchanger (162). At this time, the refrigerant flowing from the first outdoor heat exchanger (114) can increase the liquid ratio of the refrigerant by passing through the first internal heat exchanger (132).

[0346] Additionally, the refrigerant flowing from the second duct heat exchanger (164) can also flow to the first-first duct upstream heat exchanger (160) and the first-second duct upstream heat exchanger (162).

[0347] The 1-1 duct upstream heat exchanger (160) and the 1-2 duct upstream heat exchanger (162) can be operated as evaporators.

[0348] The refrigerant flowing from the 1-1 duct upstream heat exchanger (160) and the 1-2 duct upstream heat exchanger (162) can flow to the first compressor (112) through the first internal heat exchanger (132).

[0349] The flow of refrigerant flowing through the second air conditioning unit (200) is described.

[0350] A portion of the first refrigerant discharged from the second compressor (212) may flow to the first additional heat exchanger (244) through the second-2 switching valve (220) and the second internal switching valve (234). Another portion of the first refrigerant discharged from the second compressor (212) may flow to the first auxiliary heat exchanger (260) through the second-2 switching valve (220) and the second internal switching valve (234).

[0351] A portion of the first refrigerant discharged from the first additional heat exchanger (244) may flow to the second outdoor heat exchanger (214) via the second internal heat exchanger (232). The second outdoor heat exchanger (214) may operate as an evaporator. The first refrigerant flowing from the second outdoor heat exchanger (214) may flow to the second compressor (212).

[0352] The first refrigerant flowing through the second internal heat exchanger (232) to the second outdoor heat exchanger (214) may have a high proportion of liquid refrigerant.

[0353] Another portion of the first refrigerant discharged from the first additional heat exchanger (244) can flow to the heat recovery heat exchanger (264).

[0354] The heat recovery heat exchanger (264) can be operated as an evaporator. The first refrigerant flowing from the heat recovery heat exchanger (264) can flow to the second compressor (212) through the second internal heat exchanger (232).

[0355] The second refrigerant discharged from the first additional compressor (242) flows to the first heating heat exchanger (262). The first heating heat exchanger (262) can be operated as a condenser.

[0356] The second refrigerant discharged from the first heating heat exchanger (262) can flow to the first additional compressor (242) through the first additional heat exchanger (244).

[0357] In the first additional heat exchanger (244), the first refrigerant and the second refrigerant can exchange heat.

[0358] The flow of refrigerant flowing through the third air conditioning device (300) is described.

[0359] The refrigerant flowing through the third compressor (312) may be referred to as the first refrigerant. The refrigerant flowing through the second additional compressor (342) may be referred to as the second refrigerant. The first refrigerant flowing through the third compressor (312) may use the same refrigerant as the refrigerant flowing through the second compressor (212). The second refrigerant flowing through the second additional compressor (342) may also use the same refrigerant as the refrigerant flowing through the first additional compressor (242).

[0360] A portion of the first refrigerant discharged from the third compressor (312) flows to the third outdoor heat exchanger (314). The third outdoor heat exchanger (314) can be operated as a condenser.

[0361] Another portion of the first refrigerant discharged from the third compressor (312) may flow to the second additional heat exchanger (344) through the third-2 switching valve (320) and the third internal switching valve (334). Another portion of the first refrigerant discharged from the third compressor (312) may flow to the second auxiliary heat exchanger (364) through the third-2 switching valve (320) and the third internal switching valve (334).

[0362] The first refrigerant flowing from the third outdoor heat exchanger (314) can flow to the first-1 duct downstream heat exchanger (360) and the first-2 duct downstream heat exchanger (362) via the third internal heat exchanger (332). The first refrigerant flowing from the third outdoor heat exchanger (314) can increase the proportion of liquid refrigerant by passing through the third internal heat exchanger (332).

[0363] The first refrigerant discharged from the second additional heat exchanger (344) can also flow to the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362). Each of the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362) can be operated as an evaporator.

[0364] The first refrigerant flowing from each of the 1-1 duct downstream heat exchanger (360) and the 1-2 duct downstream heat exchanger (362) can flow to the third compressor (312) through the third internal heat exchanger (332).

[0365] The second refrigerant discharged from the second additional compressor (342) flows to the second heating heat exchanger (366). The second heating heat exchanger (366) can be operated as a condenser.

[0366] The second refrigerant discharged from the second heating heat exchanger (366) can flow to the second additional compressor (342) through the second additional heat exchanger (344). In the second additional heat exchanger (344), the first refrigerant and the second refrigerant can undergo heat exchange.

[0367] Referring to FIG. 9, an air conditioning system according to another embodiment of the present disclosure is described.

[0368] The following description focuses on differences from the air conditioning system described in Fig. 1. Configurations not described in Fig. 9 can be understood in the same way as those described in Fig. 1.

[0369] The air conditioning system includes a first duct (400) that sends air flowing in from an outdoor space to an indoor space. A plurality of heat exchangers are arranged in the first duct (400). A first fan (402) that supplies air to the indoor space may be arranged in the first duct (400).

[0370] In the first duct (400), the heat exchangers of each of a pair of first air conditioning units (100a, 100b) may be arranged in parallel. In the first duct (400), the heat exchangers of each of a pair of third air conditioning units (300a, 300b) may be arranged in parallel.

[0371] In the second duct (410), the heat exchangers of each of the pair of first air conditioning devices (100a, 100b) can be arranged in parallel.

[0372] In the third duct (420), the heat exchangers of each of a pair of second air conditioning units (200a, 200b) may be arranged in parallel. In the third duct (420), the heat exchangers of each of a pair of third air conditioning units (300a, 300b) may be arranged in parallel.

[0373] In the first duct (400), the heat exchangers of the 1-1 air conditioning unit (100a) and the 1-2 air conditioning unit (100b) may be arranged in parallel. In the first duct (400), the heat exchangers of the 3-1 air conditioning unit (300a) and the 3-2 air conditioning unit (300b) described below may be arranged in parallel.

[0374] The air flowing through the first duct (400) can sequentially flow through the first duct upstream heat exchanger (160, 162) and the first duct downstream heat exchanger (360, 362).

[0375] In the first duct (400), the first-first upstream heat exchangers (160a, 160b) of the first-first air conditioning unit (100a) and the first-second air conditioning unit (100b) are respectively arranged. In the first duct (400), the first-second upstream heat exchangers (162a, 162b) of the first-first air conditioning unit (100a) and the first-second air conditioning unit (100b) are respectively arranged.

[0376] In the first duct (400), the first-first downstream heat exchangers (360a, 360b) of the third-first air conditioning unit (300a) and the third-second air conditioning unit (300b) are respectively arranged. In the first duct (400), the third-second upstream heat exchangers (362a, 362b) of the third-first air conditioning unit (300a) and the third-second air conditioning unit (300b) are respectively arranged.

[0377] A dehumidifying rotor (424) that exchanges heat with air flowing through the third duct (420) can be placed in the first duct (400).

[0378] The air conditioning system includes a second duct (410) that sends air flowing into the indoor space to the outdoor space.

[0379] At least one heat exchanger may be arranged in the second duct (410). A second fan (412) for discharging air to the external space may be arranged in the second duct (410).

[0380] In the second duct (410), the second duct heat exchangers (164a, 164b) of the 1-1 air conditioning unit (100a) and the 1-2 air conditioning unit (100b) can be arranged.

[0381] The air conditioning system includes a third duct (420) that exchanges heat with air in the external space and discharges it to the external space.

[0382] A plurality of heat exchangers for heat exchange with air brought in from the external space are arranged in the third duct (420). A third fan (422) for bringing in air from the external space and sending it to the external space may be arranged in the third duct (420).

[0383] In the third duct (420), the 3-1 upper stream heat exchangers (364a, 364b) of the 3-1 air conditioning unit (300a) and the 3-2 air conditioning unit (300b) are respectively arranged. In the third duct (420), the 3-2 upper stream heat exchangers (366a, 366b) of the 3-1 air conditioning unit (300a) and the 3-2 air conditioning unit (300b) are respectively arranged.

[0384] In the third duct (420), the 3-1 downstream heat exchangers (260a, 260b) of the 2-1 air conditioning unit (200a) and the 2-2 air conditioning unit (200b) are respectively arranged. In the third duct (420), the 3-2 downstream heat exchangers (262a, 262b) of the 2-1 air conditioning unit (200a) and the 2-2 air conditioning unit (200b) are respectively arranged. In the third duct (420), the 3-3 downstream heat exchangers (264a, 264b) of the 2-1 air conditioning unit (200a) and the 2-2 air conditioning unit (200b) are respectively arranged.

[0385] Although the preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above, and various modifications may be made by a person having ordinary skill in the art to which the present disclosure pertains without departing from the gist of the present disclosure as claimed in the claims, and such modifications should not be understood individually from the technical idea or prospect of the present disclosure.

Claims

1. A first duct that sends air flowing in from an outdoor space to an indoor space and has multiple heat exchangers arranged inside; A second duct that sends air discharged from the indoor space to the outdoor space; A third duct that sends air flowing in from the outdoor space to the outdoor space and has a plurality of heat exchangers arranged inside; A first air conditioning device that supplies refrigerant to at least one first duct upstream heat exchanger arranged in the first duct and a second duct heat exchanger arranged in the second duct; A second air conditioning device that supplies refrigerant to at least one third duct downstream heat exchanger arranged in the third duct; and An air conditioning system including a third air conditioning device that supplies refrigerant to at least one first duct downstream heat exchanger arranged in the first duct and at least one third duct upstream heat exchanger arranged in the third duct.

2. In paragraph 1, An air conditioning system including a dehumidifying rotor disposed on the first duct and the third duct to dehumidify the air in the first duct.

3. In paragraph 2, An air conditioning system in which a first heating heat exchanger for heating air flowing through the dehumidifying rotor is disposed in the third duct.

4. In paragraph 3, The second air conditioning device includes a second outdoor unit in which a second compressor and a second outdoor heat exchanger are arranged, and a first additional unit driven by a first additional compressor and exchanging heat with the refrigerant discharged from the second outdoor unit. The above first heating heat exchanger is an air conditioning system in which the refrigerant discharged from the first additional compressor flows.

5. In paragraph 4, The above second outdoor unit and the above first additional unit use different refrigerants, An air conditioning system in which the refrigerant flowing through the second outdoor unit and the refrigerant flowing through the first additional unit are heat-exchanged in the first additional heat exchanger arranged in the first additional unit.

6. In paragraph 5, An air conditioning system in which the refrigerant flowing through the second compressor operates at a higher pressure than the refrigerant flowing through the first additional compressor.

7. In paragraph 3, In the third duct, a heater is placed to heat the air supplied to the dehumidifying rotor. The above heater is an air conditioning system arranged between the dehumidifying rotor and the first heating heat exchanger.

8. In paragraph 4, The second outdoor unit includes a heat recovery heat exchanger arranged in the third duct, An air conditioning system in which the above heat recovery heat exchanger is placed downstream of the above dehumidifying rotor.

9. In paragraph 4, The second air conditioning device is an air conditioning system further including a second heat recovery kit that exchanges heat between the refrigerant flowing from the second outdoor unit and the refrigerant flowing to the second outdoor unit.

10. In paragraph 9, The second heat recovery kit is an air conditioning system including a second internal heat exchanger that exchanges heat between refrigerant flowing outside the second outdoor unit and refrigerant flowing inside the second outdoor unit through the second outdoor heat exchanger.

11. In paragraph 1, The third air conditioning device is an air conditioning system including a third outdoor unit having a third compressor and a third outdoor heat exchanger and supplying refrigerant to a heat exchanger disposed in the first duct or the third duct, and a second additional unit driven by a second additional compressor and exchanging heat with refrigerant discharged from the third outdoor unit and supplying refrigerant to a heat exchanger disposed in the third duct.

12. In paragraph 11, The second additional unit is an air conditioning system including a second heating heat exchanger that heat-exchanges the refrigerant discharged from the second additional compressor and the air flowing through the third duct.

13. In paragraph 12, An air conditioning system in which the second heating heat exchanger is disposed upstream of a dehumidifying rotor disposed on the first duct and the third duct to dehumidify the air in the first duct.

14. In paragraph 11, The third air conditioning device is an air conditioning system further including a third heat recovery kit that exchanges heat between the refrigerant flowing from the third outdoor unit and the refrigerant flowing to the third outdoor unit.

15. In paragraph 13, The third outdoor unit is an air conditioning system including a first duct downstream heat exchanger arranged in the first duct to exchange heat with air flowing from the dehumidifying rotor.

16. A first duct that sends air flowing in from an outdoor space to an indoor space and has multiple heat exchangers arranged inside; A second duct that sends air discharged from the indoor space to the outdoor space; A third duct that sends air flowing in from the outdoor space to the outdoor space and has a plurality of heat exchangers arranged inside; A first air conditioning device that supplies refrigerant to at least one first duct heat exchanger arranged in the first duct and a second duct heat exchanger arranged in the second duct; A second air conditioning unit that supplies refrigerant to at least one heat exchanger arranged in the third duct; and An air conditioning system including a dehumidifying rotor disposed on the first duct and the third duct to dehumidify the air in the first duct.

17. In paragraph 16, The first air conditioning unit is, An air conditioning system comprising a first outdoor unit in which a first compressor and a first outdoor heat exchanger are arranged and a heat exchanger is arranged in each of the first duct and the second duct to supply refrigerant, and a first heat recovery kit that heat-exchanges refrigerant flowing from the first outdoor unit and refrigerant flowing to the first outdoor unit.

18. In paragraph 16, The second air conditioning device includes a second outdoor unit having a second compressor and a second outdoor heat exchanger and supplying refrigerant to a plurality of heat exchangers arranged in the third duct, and a first additional unit driven by a first additional compressor and exchanging heat with the refrigerant discharged from the second outdoor unit. The above first additional unit is an air conditioning system including a first heating heat exchanger that heat-exchanges the refrigerant discharged from the first additional compressor and the air of the third duct.

19. In paragraph 18, An air conditioning system in which the first heating heat exchanger is placed upstream of the dehumidifying rotor.

20. In paragraph 18, The second air conditioning device is an air conditioning system further including a second heat recovery kit that exchanges heat between the refrigerant flowing from the second outdoor unit and the refrigerant flowing to the second outdoor unit.

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