Air conditioning system

Abstract

The present invention relates to an air conditioning system. The air conditioning system of the present invention includes a first duct that transports air flowing in from an outdoor space to an indoor space, a plurality of heat exchangers arranged inside the first duct, a second duct that transports air discharged from the indoor space to the outdoor space, and a third duct that transports air flowing in from the outdoor space to the outdoor space, a plurality of heat exchangers arranged inside the third duct. In addition, the air conditioning system includes a first air conditioning device that 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 that supplies refrigerant to at least one third downstream heat exchanger arranged in the third duct, and a third air conditioning device that 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

Technical Field

[0001] This invention relates to air conditioning systems, and more specifically, to an air conditioning system that supplies ultra-low humidity air to an indoor space using a plurality of ducts and a plurality of air conditioning units. Background Technology

[0002] Typically, industrial air conditioning systems used to achieve low humidity in indoor spaces supply outdoor air after it has been dehumidified. To improve dehumidification performance, a dehumidifying impeller can be installed to exchange heat between the air supplied to the indoor space and the air exhausted to the outdoor space.

[0003] In addition, there has been a need in recent years for an air conditioning system to maintain an ultra-low humidity environment for operations requiring precision processes.

[0004] Korean patent KR10-2021-0072325A 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 using only this type of ordinary air conditioning system. Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] The purpose of this invention is to provide an air conditioning system that supplies air with ultra-low humidity to an indoor space.

[0008] Another object of the present invention is to provide an air conditioning system that supplies ultra-low humidity air to an indoor space regardless of the outdoor environment.

[0009] Another object of the present invention is to provide an air conditioning system that simultaneously regenerates the dehumidifying impeller used.

[0010] Another object of the present invention is to provide an air conditioning system that improves the overall heat exchange performance by improving the performance of the outdoor heat exchanger.

[0011] The purpose of this invention is not limited to the purposes mentioned above, and those skilled in the art will clearly understand other purposes not mentioned from the following description.

[0012] Technical solutions to the problem

[0013] To address the aforementioned problems, the air conditioning system of this invention includes: a first duct for supplying air flowing from an outdoor space to an indoor space, with a plurality of heat exchangers arranged inside the first duct; a second duct for supplying air discharged from the indoor space to the outdoor space; and a third duct for supplying air flowing from the outdoor space to the outdoor space, with a plurality of heat exchangers arranged inside the third duct. Furthermore, the air conditioning system includes: a first air conditioning unit for supplying refrigerant to at least one upstream heat exchanger arranged in the first duct and a second heat exchanger arranged in the second duct; a second air conditioning unit for supplying refrigerant to at least one downstream heat exchanger arranged in the third duct; and a third air conditioning unit for supplying refrigerant to at least one downstream heat exchanger arranged in the first duct and at least one upstream heat exchanger arranged in the third duct. Therefore, air supplied via the first duct can be supplied to the indoor space with ultra-low humidity through the heat exchangers of the first and third air conditioning units.

[0014] The air conditioning system includes a dehumidifying impeller arranged in the first and third ducts to dehumidify the air in the first duct. Therefore, additional dehumidification can be applied to the air flowing in the first duct. Furthermore, the dehumidifying impeller can be regenerated using air flowing in the third duct.

[0015] A first heating heat exchanger is arranged in the third duct to heat the air flowing toward the dehumidifying impeller. Therefore, the dehumidifying impeller can be regenerated by the first heating heat exchanger.

[0016] The second air conditioning unit includes: a second outdoor unit with a second compressor and a second outdoor heat exchanger; and a first additional unit driven by the first additional compressor, which exchanges heat with refrigerant discharged from the second outdoor unit. The refrigerant discharged from the first additional compressor can flow through the first heating heat exchanger.

[0017] The second outdoor unit and the first additional unit use different refrigerants. The refrigerant flowing in the second outdoor unit can exchange heat with the refrigerant flowing in the first additional unit in a first additional heat exchanger arranged in the first additional unit.

[0018] The refrigerant flowing through the second compressor is a refrigerant that operates at a higher pressure than the refrigerant flowing through the first additional compressor. Therefore, the first additional unit can operate while maintaining system stability.

[0019] A heater for heating the air supplied to the dehumidifying impeller is arranged in the third duct. The heater is positioned between the dehumidifying impeller and the first heating heat exchanger. Therefore, it is possible to additionally heat the air flowing to the dehumidifying impeller.

[0020] The second outdoor unit includes a heat recovery heat exchanger arranged in the third duct. The heat recovery heat exchanger is located downstream of the dehumidification impeller. The heat recovery heat exchanger improves the heat exchange performance of the second outdoor unit, which operates as a plurality of heat exchangers.

[0021] The second air conditioning unit may further include a second heat recovery kit for exchanging heat between the refrigerant flowing out of the second outdoor unit and the refrigerant flowing towards the second outdoor unit. Therefore, the two-phase refrigerant supplied to or flowing to the outside of the outdoor unit can be liquefied.

[0022] The second heat recovery kit includes a second internal heat exchanger that allows heat exchange between refrigerant flowing to the outside of the second outdoor unit via the second outdoor heat exchanger and refrigerant flowing to the inside of the second outdoor unit. Therefore, the two-phase refrigerant flowing to or from the second outdoor heat exchanger can be liquefied.

[0023] The third air conditioning unit includes: a third outdoor unit, which is equipped with a third compressor and a third outdoor heat exchanger, and allows refrigerant to flow to the heat exchanger arranged in the first pipe or the third pipe; and a second additional unit, driven by a second additional compressor, which exchanges heat with the refrigerant discharged from the third outdoor unit and supplies refrigerant to the heat exchanger arranged in the third pipe. Therefore, heat exchangers can be additionally arranged in the first pipe and the third pipe.

[0024] The second additional unit includes a second heating heat exchanger that allows refrigerant discharged from the second additional compressor to exchange heat with air flowing in the third duct.

[0025] The second heating heat exchanger is arranged upstream of the dehumidifying impeller, which is arranged in the first pipe and the third pipe to dehumidify the air in the first pipe, thereby enabling the dehumidifying impeller to regenerate.

[0026] The third air conditioning unit may further include a third heat recovery kit for exchanging heat between the refrigerant flowing out of the third outdoor unit and the refrigerant flowing into the third outdoor unit. This allows for the liquefaction of both phases of refrigerant flowing into or out of the third outdoor unit.

[0027] The third outdoor unit may include a heat exchanger disposed downstream of the first duct in the first duct to allow heat exchange with air flowing from the dehumidifier impeller.

[0028] The air conditioning system of the present invention includes: a first duct for conveying air flowing from an outdoor space to an indoor space, wherein a plurality of heat exchangers are arranged inside the first duct; a second duct for conveying air discharged from the indoor space to the outdoor space; and a third duct for conveying air flowing from the outdoor space to the outdoor space, wherein a plurality of heat exchangers are arranged inside the third duct. The air conditioning system of the present invention also includes: a first air conditioning unit for supplying refrigerant to at least one heat exchanger arranged in the first duct and a second heat exchanger arranged in the second duct; a second air conditioning unit for supplying refrigerant to at least one heat exchanger arranged in the third duct; and a dehumidifying impeller arranged in the first duct and the third duct for dehumidifying the air in the first duct. Therefore, the dehumidifying impeller can be regenerated using the third duct, and the air flowing in the first duct can be made to a state of ultra-low humidity.

[0029] The first air conditioning unit includes a first outdoor unit, which is equipped with a first compressor and a first outdoor heat exchanger, supplying refrigerant to the heat exchangers respectively arranged in the first pipe and the second pipe. The first air conditioning unit also includes a first heat recovery kit, which allows heat exchange between refrigerant flowing from the first outdoor unit and refrigerant flowing towards the first outdoor unit. Therefore, the heat dissipation performance of the outdoor heat exchanger can be improved by using the first outdoor unit and the first heat recovery kit.

[0030] The second air conditioning unit includes a second outdoor unit, which is equipped with a second compressor and a second outdoor heat exchanger, and supplies refrigerant to a plurality of heat exchangers arranged in the third duct. The second air conditioning unit also includes a first supplementary unit driven by a first supplementary compressor, which exchanges heat with the refrigerant discharged from the second outdoor unit.

[0031] The first additional unit includes a first heating heat exchanger that allows refrigerant discharged from the first additional compressor to exchange heat with the air in the third duct. Therefore, the dehumidifying impeller arranged in the third duct region can be regenerated by heating the air flowing toward the dehumidifying impeller.

[0032] The first heating heat exchanger is arranged upstream of the dehumidifying impeller.

[0033] The second air conditioning unit further includes a second heat recovery kit that allows heat exchange between the refrigerant flowing out of the second outdoor unit and the refrigerant flowing into the second outdoor unit. Therefore, the heat dissipation performance of the second outdoor heat exchanger can be improved.

[0034] Specific details regarding other embodiments are included in the detailed description and accompanying drawings.

[0035] Invention Effects

[0036] The air conditioning system according to the present invention has one or more of the following effects.

[0037] First, by using multiple pipes and multiple air conditioning units, it is possible to make the air flowing in the first pipe into an ultra-low humidity state.

[0038] Secondly, the air flowing in the first duct can be dehumidified by a first air conditioning unit, a second air conditioning unit, a dehumidifying impeller, and multiple heat exchangers. Additionally, the air flowing in the third duct can be heated to regenerate the dehumidifying impeller. Therefore, the dehumidifying impeller can be kept running continuously.

[0039] In addition, by using a third air conditioning unit, the air supplied to the indoor space via the first duct can be maintained at an ultra-low humidity level. By selectively operating and switching multiple heat exchangers, the temperature and humidity of the air supplied to the indoor space can be maintained regardless of outdoor temperature and humidity conditions.

[0040] Third, the heat recovery kit can liquefy the two-phase refrigerant flowing to or from the outdoor heat exchanger. This improves the heat dissipation performance of the outdoor heat exchanger and other components, thereby enhancing the overall heat exchange performance of the air conditioning system.

[0041] The effects of the present invention are not limited to those mentioned above, and those skilled in the art can more clearly understand other effects not mentioned through the description in the appended claims. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of an air conditioning system according to an embodiment of the present invention.

[0043] Figure 2 This is a system diagram illustrating the configuration of a first air conditioning device according to an embodiment of the present invention.

[0044] Figure 3 This is a system diagram illustrating the configuration of a second air conditioning device according to an embodiment of the present invention.

[0045] Figure 4 This is a system diagram illustrating the configuration of a third air conditioning device according to an embodiment of the present invention.

[0046] Figure 5 This is a diagram illustrating the flow of refrigerant in an air conditioning system according to an embodiment of the present invention during summer operation.

[0047] Figure 6 This is a diagram illustrating the flow of refrigerant in an air conditioning system according to an embodiment of the present invention during normal winter operation.

[0048] Figure 7 This is a diagram illustrating the flow of refrigerant in an air conditioning system according to an embodiment of the present invention during operation in low-temperature winter.

[0049] Figure 8 This is a diagram illustrating the flow of refrigerant in an air conditioning system according to an embodiment of the present invention during transitional seasons.

[0050] Figure 9 This is a schematic diagram of an air conditioning system according to another embodiment of the present invention. Detailed Implementation

[0051] The advantages and features of the present invention, as well as methods of implementing them, will become apparent from the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms. These embodiments are provided only to more fully disclose the invention and to more completely indicate the scope of the invention to those skilled in the art. The invention is defined only by the scope of the claims. Throughout this specification, the same reference numerals denote the same constituent elements.

[0052] Terms containing ordinal numbers such as "first" and "second" may be used to describe a variety of constituent elements, but the constituent elements are not limited by the terms. The terms are used only for the purpose of distinguishing one constituent element from other constituent elements.

[0053] Hereinafter, an air conditioning system according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0054] Reference Figure 1 The entire air conditioning system of the present invention will be described.

[0055] The air conditioning system includes a first duct 400 that supplies air from the outdoor space to the 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.

[0056] At least one upstream heat exchanger (or “first duct heat exchanger”) 160, 162 of the first air conditioning unit 100, which will be described later, may be arranged in the first duct 400. At least one downstream heat exchanger 360, 362 of the third air conditioning unit 300, which will be described later, may be arranged in the first duct 400.

[0057] The air flowing in the first pipe 400 can flow sequentially through the upstream heat exchangers 160 and 162 and the downstream heat exchangers 360 and 362 of the first pipe.

[0058] A dehumidifying impeller 424 may be arranged in the first conduit 400 to exchange heat with the air flowing in the third conduit 420, which will be described later. The dehumidifying impeller 424 may be arranged between the upstream heat exchangers 160, 162 and the downstream heat exchangers 360, 362 of the first conduit.

[0059] The dehumidifying impeller 424 can remove moisture from the air flowing toward hygroscopic substances.

[0060] The dehumidifying impeller 424 can be regenerated by air flowing in the third duct 420. The dehumidifying impeller 424 can also be regenerated by air flowing in the first duct 400.

[0061] The air conditioning system includes a second duct 410 that delivers air from the indoor space to the outdoor space.

[0062] At least one heat exchanger may be arranged in the second duct 410. A second fan 412 may be arranged in the second duct 410 to exhaust air to the outside space. A second fan 412 may be arranged in the second duct 410 to exhaust air from the indoor space to the outside space.

[0063] A second duct heat exchanger 164 of the first air conditioning unit 100 may be arranged in the second duct 410. The air flowing in the second duct 410 can be discharged to the outside space through the second duct heat exchanger 164 by the second fan 412.

[0064] The air conditioning system includes a third duct 420 that exchanges heat with air in the outside space and exhausts it to the outside space.

[0065] A plurality of heat exchangers are arranged in the third duct 420 to exchange heat with air flowing in from the outside space. A third fan 422 may be arranged in the third duct 420 to introduce air into the outside space and deliver it to the outside space.

[0066] At least one third upstream heat exchanger 364, 366 of the third air conditioning unit 300 may be arranged in the third conduit 420. A plurality of third downstream heat exchangers 260, 262, 264 of the second air conditioning unit 200 may be arranged in the third conduit 420.

[0067] The air flowing in the third pipe 420 can flow sequentially through the third upstream heat exchangers 364 and 366 and the third downstream heat exchangers 260, 262 and 264.

[0068] A dehumidifying impeller 424 that exchanges heat with the air flowing in the first pipe 400 may be arranged in the third pipe 420. The dehumidifying impeller 424 may be arranged between a plurality of downstream heat exchangers 260, 262, 264 of the third pipe.

[0069] A heater 426 for heating the air flowing in the third duct 420 can be arranged in the third duct 420. The heater 426 can receive electricity to heat the air flowing in the third duct 420. The heater 426 can be arranged between a plurality of downstream heat exchangers 260, 262, 264 of the third duct. The heater 426 can be arranged upstream of the dehumidification impeller 424.

[0070] The air conditioning system includes a first bypass pipe 430 that connects the first pipe 400 and the second pipe 410.

[0071] Air flowing in the second pipe 410 can flow to the first pipe 400 through the first bypass pipe 430. The first bypass pipe 430 is connected to the second pipe 410 in the upstream region of the second pipe heat exchanger 164. The first bypass pipe 430 is connected to the first pipe 400 in a region further upstream than the upstream heat exchangers 160 and 162 of the first pipe.

[0072] That is, air flowing from the indoor space into the second pipe 410 can flow to the upstream end of the first pipe 400 through the first bypass pipe 430. The air flowing to the first pipe 400 through the first bypass pipe 430 can be air that does not undergo heat exchange inside the second pipe 410.

[0073] A first bypass valve 432 is arranged inside the first bypass pipe 430 to open and close the internal flow path of the first bypass pipe 430.

[0074] The air conditioning system includes a second bypass pipe 440 that connects the first pipe 400 and the third pipe 420.

[0075] Air flowing in the first conduit 400 can flow to the third conduit 420 via the second bypass conduit 440. The second bypass conduit 440 is connected to the third conduit 420 in the upstream region of the third upstream heat exchangers 364, 366. The second bypass conduit 440 is connected to the first conduit 400 among a plurality of downstream heat exchangers 360, 362 arranged in the first conduit 400.

[0076] That is, the air that passes through multiple heat exchangers while flowing through the first pipe 400 can flow through the second bypass pipe 440 to the upstream end of the third pipe 420.

[0077] A second bypass valve 442 is arranged inside the second bypass pipe 440 to open and close the internal flow path of the second bypass pipe 440.

[0078] The air conditioning system includes a first air conditioning unit 100, which operates by a first compressor 112 to supply refrigerant to a plurality of heat exchangers arranged in a first pipe 400 and a second pipe 410.

[0079] The first air conditioning unit 100 includes upstream heat exchangers 160 and 162 arranged in the first pipe 400. The upstream heat exchangers 160 and 162 include upstream heat exchanger 160 of pipe 1-1 and upstream heat exchanger 162 of pipe 1-2 arranged downstream of upstream heat exchanger 160 of pipe 1-1.

[0080] The upstream heat exchanger 160 of the first-1 pipe is arranged closer to the inlet side of the first pipe 400 than the upstream heat exchanger 162 of the first-2 pipe. Therefore, air flowing in through the inlet of the first pipe 400 can pass through the upstream heat exchanger 160 of the first-1 pipe and the upstream heat exchanger 162 of the first-2 pipe in sequence.

[0081] The first air conditioning unit 100 includes a second pipe heat exchanger 164 arranged in the second pipe 410.

[0082] The air conditioning system includes a second air conditioning unit 200, which operates using a second compressor 212 to supply refrigerant to a plurality of heat exchangers arranged in a third pipe 420.

[0083] The second air conditioning unit 200 includes downstream heat exchangers 260, 262, and 264 of the third duct 420. The downstream heat exchangers 260, 262, and 264 include a first auxiliary heat exchanger 260, a first heating heat exchanger 262 located further downstream of the first auxiliary heat exchanger 260, and a heat recovery heat exchanger 264 located further downstream of the first heating heat exchanger 262.

[0084] The heat recovery heat exchanger 264 is arranged closer to the outlet side of the third pipe 420 than the first heating heat exchanger 262. The first heating heat exchanger 262 is arranged closer to the outlet side of the third pipe 420 than the first auxiliary heat exchanger 260.

[0085] Therefore, the air flowing in through the intake of the third pipe 420 can pass sequentially through the first auxiliary heat exchanger 260, the first heating heat exchanger 262, and the heat recovery heat exchanger 264.

[0086] A dehumidifying impeller 424 may be arranged between the first heating heat exchanger 262 and the heat recovery heat exchanger 264. A heater 426 may be arranged between the first heating heat exchanger 262 and the heat recovery heat exchanger 264.

[0087] The air conditioning system includes a third air conditioning unit 300, which operates using a third compressor 312 to supply refrigerant to a plurality of heat exchangers arranged in the first pipe 400 and the third pipe 420.

[0088] The third air conditioning unit 300 includes downstream heat exchangers 360 and 362 arranged in the first duct 400. The downstream heat exchangers 360 and 362 are located inside the first duct 400 further downstream than the upstream heat exchangers 160 and 162. Therefore, air flowing through the upstream heat exchangers 160 and 162 flows towards the downstream heat exchangers 360 and 362.

[0089] The first downstream heat exchangers 360 and 362 include the first downstream heat exchanger 360 of the first-1 pipe and the first downstream heat exchanger 362 of the first-2 pipe, which is located further downstream than the first downstream heat exchanger 360 of the first-1 pipe.

[0090] The downstream heat exchanger 362 of the first-second pipe is arranged closer to the outlet side of the first pipe 400 than the downstream heat exchanger 360 of the first-first pipe. Therefore, air flowing in through the intake of the first pipe 400 can pass sequentially through the downstream heat exchanger 360 of the first-first pipe and the downstream heat exchanger 362 of the first-second pipe.

[0091] A second bypass pipe 440 may be arranged between the downstream heat exchanger 360 of the first-1 pipe and the downstream heat exchanger 362 of the first-2 pipe.

[0092] The third air conditioning unit 300 includes third upstream heat exchangers 364 and 366 arranged in the third duct 420. The third upstream heat exchangers 364 and 366 include a second auxiliary heat exchanger 364 and a second heating heat exchanger 366 arranged downstream of the second auxiliary heat exchanger 364.

[0093] The second auxiliary heat exchanger 364 is arranged closer to the intake side of the third duct 420 than the second heating heat exchanger 366. Therefore, air flowing in through the intake of the third duct 420 can pass sequentially through the second auxiliary heat exchanger 364 and the second heating heat exchanger 366.

[0094] Air passing through the third upstream heat exchangers 364 and 366 flows to the third downstream heat exchangers 260, 262 and 264.

[0095] A second bypass pipe 440 can be arranged on the upstream side of the third upstream heat exchangers 364 and 366.

[0096] Reference Figure 2 The specific structure of the first air conditioning unit 100 and its connection relationship with the first pipe 400 and the second pipe 410 are explained.

[0097] The first air conditioning unit 100 includes a first outdoor unit 110 with a first compressor 112 and a first outdoor heat exchanger 114 arranged thereon, and a first heat recovery kit 130 for exchanging heat between refrigerant flowing out of the first outdoor unit 110 and refrigerant flowing toward the first outdoor unit 110 or for changing the flow direction of the refrigerant.

[0098] The first air conditioning unit 100 includes a heat exchanger 160 arranged upstream of the first-1 pipe of the first pipe 400, a heat exchanger 164 arranged upstream of the first pipe 400, and a heat exchanger 164 arranged in the second pipe 410.

[0099] The first outdoor unit 110 includes a first compressor 112. The first outdoor unit 110 includes a first outdoor heat exchanger 114 that allows refrigerant flowing from the first compressor 112 to exchange heat with outdoor air.

[0100] The first outdoor unit 110 includes a first receiver 122 that supplies gaseous refrigerant to the first compressor 112. The first outdoor unit 110 includes first switching valves 118, 120 that supply refrigerant flowing from the first compressor 112 to the first outdoor heat exchanger 114 or to the outside of the first outdoor unit 110.

[0101] The first outdoor unit 110 includes a first-1 switching valve 118 that supplies refrigerant flowing from the first compressor 112 to the first outdoor heat exchanger 114 or supplies refrigerant flowing from the first outdoor heat exchanger 114 to the first compressor 112. The first outdoor unit 110 also includes a first-2 switching valve 120 that supplies refrigerant flowing from the first compressor 112 to the outside of the first outdoor unit 110.

[0102] The first outdoor unit 110 includes a first outdoor expansion valve 116 that expands refrigerant flowing out of or into the first outdoor heat exchanger 114.

[0103] The first outdoor expansion valve 116 can expand the liquid refrigerant flowing into the first outdoor heat exchanger 114. The first outdoor expansion valve 116 can also expand the liquid refrigerant flowing out of the first outdoor heat exchanger 114.

[0104] The first heat recovery kit 130 includes a first internal heat exchanger 132 that allows refrigerant flowing to the outside of the first outdoor unit 110 via the first outdoor heat exchanger 114 to exchange heat with refrigerant flowing to the inside of the first outdoor unit 110.

[0105] The first heat recovery kit 130 includes a first internal switching valve 134 that supplies refrigerant discharged from the first outdoor unit 110 to the second pipe heat exchanger 164 or the first pipe upstream heat exchangers 160, 162.

[0106] The first internal switching valve 134 can deliver high-pressure refrigerant discharged from the first compressor 112 to the second pipeline heat exchanger 164. Additionally, the first internal switching valve 134 can deliver high-pressure refrigerant discharged from the first compressor 112 to the upstream heat exchanger 162 of the first-second pipeline.

[0107] The first air conditioning unit 100 includes first expansion valves 170, 172, and 174 for expanding refrigerant flowing through a heat exchanger arranged in a first conduit 400 or a second conduit 410. The first air conditioning unit 100 includes a first-1 expansion valve 170 for expanding refrigerant flowing to or from an upstream heat exchanger 160 in the first-1 conduit. The first air conditioning unit 100 includes a first-2 expansion valve 172 for expanding refrigerant flowing to or from an upstream heat exchanger 162 in the first-2 conduit. The first air conditioning unit 100 includes a first-3 expansion valve 174 for expanding refrigerant flowing to an upstream heat exchanger 164 in the second conduit.

[0108] Reference Figure 3 The specific structure of the second air conditioning unit 200 and its connection relationship with the first pipe 400 and the third pipe 420 are explained.

[0109] The second air conditioning unit 200 includes a second outdoor unit 210 with a second compressor 212 and a second outdoor heat exchanger 214 arranged thereon, and a second heat recovery kit 230 that allows the refrigerant flowing out of the second outdoor unit 210 to exchange heat with the refrigerant flowing toward the second outdoor unit 210 or to change the flow direction of the refrigerant.

[0110] The second air conditioning unit 200 includes a first additional unit 240, which exchanges heat with refrigerant discharged from the second outdoor unit 210, and includes a first additional compressor 242.

[0111] The second air conditioning unit 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.

[0112] The second outdoor unit 210 includes a second compressor 212. The second outdoor unit 210 includes a second outdoor heat exchanger 214 that allows refrigerant flowing from the second compressor 212 to exchange heat with outdoor air.

[0113] The second outdoor unit 210 includes a second receiver 224 that supplies gaseous refrigerant to the second compressor 212. The second outdoor unit 210 also includes second switching valves 218 and 220 that deliver refrigerant flowing from the second compressor 212 to the second outdoor heat exchanger 214 or to the outside of the second outdoor unit 210.

[0114] The second outdoor unit 210 includes a second-1 switching valve 218 that supplies refrigerant from the second compressor 212 to the second outdoor heat exchanger 214 or supplies refrigerant from the second outdoor heat exchanger 214 to the second compressor 212. The second outdoor unit 210 also includes a second-2 switching valve 220 that supplies refrigerant from the second compressor 212 to the outside of the second outdoor unit 210.

[0115] The second outdoor unit 210 includes a second outdoor expansion valve 216 that expands the refrigerant flowing out of or into the second outdoor heat exchanger 214.

[0116] The second outdoor expansion valve 216 can expand the liquid refrigerant flowing into the second outdoor heat exchanger 214. The second outdoor expansion valve 216 can also expand the liquid refrigerant flowing out of the second outdoor heat exchanger 214.

[0117] The second heat recovery kit 230 includes a second internal heat exchanger 232 that allows refrigerant flowing to the outside of the second outdoor unit 210 via the second outdoor heat exchanger 214 to exchange heat with refrigerant flowing from the outside of the second outdoor unit 210 to the second compressor 212.

[0118] The second heat recovery kit 230 includes a second internal switching valve 234 that supplies refrigerant discharged from the second outdoor unit 210 to the first supplementary heating exchanger 244 or the downstream heat exchangers 260, 262, 264 of the third pipeline.

[0119] The second internal switching valve 234 can deliver high-pressure refrigerant discharged from the second compressor 212 to the first auxiliary heat exchanger 244. Additionally, the second internal switching valve 234 can deliver high-pressure refrigerant discharged from the second compressor 212 to the first auxiliary heat exchanger 260. The second internal switching valve 234 can deliver high-pressure refrigerant discharged from the second compressor 212 to both the first auxiliary heat exchanger 244 and the first auxiliary heat exchanger 260.

[0120] The first additional unit 240 includes a first additional compressor 242 and a first additional heat exchanger 244 for exchanging heat between refrigerant flowing from the first additional compressor 242 and refrigerant flowing from the second outdoor unit 210. The first additional heat exchanger 244 may be a plate heat exchanger.

[0121] The refrigerant discharged from the first additional compressor 242 flows to the first heating heat exchanger 262.

[0122] The first additional unit 240 includes a first additional receiver 248 that supplies gaseous refrigerant to the first additional compressor 242.

[0123] The first supplementary unit 240 includes a first liquid refrigerant extractor 250 that supplies liquid refrigerant to the first supplementary heat exchanger 244. The first liquid refrigerant extractor 250 can separate refrigerant flowing from the first heat exchanger 262. The first liquid refrigerant extractor 250 can separate the refrigerant flowing from the first heat exchanger 262 into gaseous refrigerant and liquid refrigerant. The first liquid refrigerant extractor 250 supplies liquid refrigerant to the first supplementary heat exchanger 244. The first liquid refrigerant extractor 250 delivers gaseous refrigerant to the first supplementary liquid receiver 248.

[0124] The first additional unit 240 includes a first-first additional expansion valve 252 that expands the refrigerant flowing out of the first heating heat exchanger 262.

[0125] The first additional unit 240 includes first and second additional expansion valves 254 that expand the refrigerant flowing from the first liquid refrigerant extractor 250.

[0126] The first supplementary unit 240 includes a first check valve 246 that prevents liquid refrigerant from flowing from the first heating heat exchanger 262 into the first supplementary compressor 242. When the first supplementary compressor 242 stops operating, the first check valve 246 can block the flow of liquid refrigerant from the first heating heat exchanger 262 to the first supplementary compressor 242.

[0127] The second air conditioning unit 200 includes second expansion valves 270, 272, and 274 that expand refrigerant flowing through a heat exchanger arranged in the third conduit 420 or the first additional unit 240.

[0128] The second air conditioning unit 200 includes a second-1 expansion valve 270 for expanding refrigerant flowing from the first auxiliary heat exchanger 260. The second air conditioning unit 200 also includes a second-2 expansion valve 272 for expanding refrigerant flowing into the heat recovery heat exchanger 264. The second air conditioning unit 200 further includes a second-3 expansion valve 274 for expanding refrigerant flowing from the first auxiliary heat exchanger 244.

[0129] The second air conditioning unit 200 includes a first solenoid valve 280 that regulates the flow of refrigerant to the first auxiliary heat exchanger 260.

[0130] The second compressor 212 and the first additional compressor 242 can use different refrigerants. The refrigerant used by the second compressor 212 can have a higher operating pressure than the refrigerant used by the first additional compressor 242. That is, the refrigerant used by the second compressor 212 can be a refrigerant that operates at a higher pressure than the refrigerant used by the first additional compressor 242. For example, the second compressor 212 can use R410A refrigerant, and the first additional compressor 242 can use R134a refrigerant.

[0131] Reference Figure 4 The specific composition of the third air conditioning unit 300 and its connection relationship with the first pipe 400 and the third pipe 420 are explained.

[0132] The third air conditioning unit 300 includes a third outdoor unit 310 with a third compressor 312 and a third outdoor heat exchanger 314, and a third heat recovery kit 330 that allows the refrigerant flowing out of the third outdoor unit 310 to exchange heat with the refrigerant flowing into the third outdoor unit 310 or to change the flow direction of the refrigerant.

[0133] The third air conditioning unit 300 includes a second additional unit 340, which exchanges heat with refrigerant discharged from the third outdoor unit 310, and includes a second additional compressor 342.

[0134] The third air conditioning unit 300 includes a third upstream heat exchanger 364, 366 arranged in the third duct 420 and a first downstream heat exchanger 360, 362 arranged in the first duct 400.

[0135] The third upstream heat exchangers 364 and 366 include a second auxiliary heat exchanger 364 and a second heating heat exchanger 366 disposed downstream of the second auxiliary heat exchanger 364. The first downstream heat exchangers 360 and 362 include a first-1 downstream heat exchanger 360 and a first-2 downstream heat exchanger 362 disposed downstream of the first-1 downstream heat exchanger 360.

[0136] The third outdoor unit 310 includes a third compressor 312. The third outdoor unit 310 includes a third outdoor heat exchanger 314 that allows the refrigerant flowing from the third compressor 312 to exchange heat with outdoor air.

[0137] The third outdoor unit 310 includes a third receiver 322 that supplies gaseous refrigerant to the third compressor 312. The third outdoor unit 310 also includes third switching valves 318 and 320 that deliver refrigerant flowing from the third compressor 312 to the third outdoor heat exchanger 314 or to the outside of the third outdoor unit 310.

[0138] The third outdoor unit 310 includes a third-1 switching valve 318 that supplies refrigerant from the third compressor 312 to the third outdoor heat exchanger 314 or supplies refrigerant from the third outdoor heat exchanger 314 to the third compressor 312. The third outdoor unit 310 also includes a third-2 switching valve 320 that supplies refrigerant from the third compressor 312 to the outside of the third outdoor unit 310.

[0139] The third outdoor unit 310 includes a third outdoor expansion valve 316 that expands the refrigerant flowing out of or into the third outdoor heat exchanger 314.

[0140] The third outdoor expansion valve 316 can expand the liquid refrigerant flowing into the third outdoor heat exchanger 314. The third outdoor expansion valve 316 can also expand the liquid refrigerant flowing out of the third outdoor heat exchanger 314.

[0141] The third heat recovery kit 330 includes a third internal heat exchanger 332 that allows refrigerant flowing to the outside of the third outdoor unit 310 via the third outdoor heat exchanger 314 to exchange heat with refrigerant flowing from the outside of the third outdoor unit 310 to the third compressor 312.

[0142] The third internal heat exchanger 332 allows the refrigerant flowing from the downstream heat exchanger 360 of the first-1 pipe to the third compressor 312 to exchange heat with the refrigerant flowing from the third compressor 312 to the second additional heat exchanger 344.

[0143] The refrigerant flowing out of the downstream heat exchanger 360 of the first-1 pipe can merge with the refrigerant flowing out of the downstream heat exchanger 362 of the first-2 pipe and then flow into the third internal heat exchanger 332.

[0144] A portion of the refrigerant flowing from the third internal heat exchanger 332 to the second auxiliary heat exchanger 344 may flow to the second auxiliary heat exchanger 364.

[0145] The third heat recovery kit 330 includes a third internal switching valve 334 that delivers refrigerant discharged from the third outdoor unit 310 to the second supplementary heating exchanger 344 or the first downstream heat exchanger 360, 362 or the third upstream heat exchanger 364, 366.

[0146] The third internal switching valve 334 can deliver high-pressure refrigerant discharged from the third compressor 312 to the second auxiliary heat exchanger 344 or the second auxiliary heat exchanger 364.

[0147] The third internal switching valve 334 can deliver the high-pressure refrigerant discharged from the third compressor 312 to the downstream heat exchanger 362 of the first-second pipeline.

[0148] The second additional unit 340 includes a second additional compressor 342 and a second additional heat exchanger 344 for exchanging heat between refrigerant flowing from the second additional compressor 342 and refrigerant flowing from the third outdoor unit 310. The second additional heat exchanger 344 may be a plate heat exchanger.

[0149] The refrigerant discharged from the second additional compressor 342 can flow to the second heating heat exchanger 366.

[0150] The second additional unit 340 includes a second additional receiver 348 that supplies gaseous refrigerant to the second additional compressor 342.

[0151] 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 out of the second heat exchanger 366.

[0152] 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 liquid refrigerant to the second supplementary heating heat exchanger 344. The second liquid refrigerant extractor 350 delivers gaseous refrigerant to the second supplementary liquid receiver 348.

[0153] The second additional unit 340 includes a second-first additional expansion valve 352 that expands the refrigerant flowing out of the second heating heat exchanger 366.

[0154] The second additional unit 340 includes a second-second additional expansion valve 354 that expands the refrigerant flowing out of the second liquid refrigerant extractor 350.

[0155] The second additional unit 340 includes a second check valve 346 to prevent liquid refrigerant from flowing from the second heating heat exchanger 366 into the second additional compressor 342. When the second additional compressor 342 stops operating, the second check valve 346 can block the flow of liquid refrigerant from the second heating heat exchanger 366 to the second additional compressor 342.

[0156] The third air conditioning unit 300 includes third expansion valves 370, 372, 374, and 376 that expand refrigerant flowing through a heat exchanger arranged in the first conduit 400, the third conduit 420, or the first additional unit 240.

[0157] The third air conditioning unit 300 includes a third-1 expansion valve 370 that expands the refrigerant flowing from the second auxiliary heat exchanger 364. The third air conditioning unit 300 includes a third-2 expansion valve 372 that expands the refrigerant flowing into the downstream heat exchanger 360 of the first-1 pipe. The third air conditioning unit 300 includes a third-3 expansion valve 374 that expands the refrigerant flowing into the downstream heat exchanger 362 of the first-2 pipe. The third air conditioning unit 300 includes a third-4 expansion valve 376 that expands the refrigerant flowing from the second auxiliary heat exchanger 344.

[0158] The third air conditioning unit 300 includes a second solenoid valve 380 that regulates the flow of refrigerant to the second auxiliary heat exchanger 364.

[0159] The third compressor 312 and the second additional compressor 342 can use different refrigerants. The refrigerant used by the third compressor 312 can have a higher operating pressure than the refrigerant used by the second additional compressor 342.

[0160] The following is for reference Figure 5 The operation of the air conditioning system of the present invention during summer will be described.

[0161] First, using pipelines as a reference, we will explain the operation of multiple heat exchangers.

[0162] In summer, outdoor air can be hot and humid. Outdoor temperatures can reach above 23 degrees Celsius.

[0163] The first duct 400 introduces air from the outdoor space and supplies air to the indoor space.

[0164] The upstream heat exchangers 160 and 162 and the downstream heat exchangers 360 and 362 of the first pipe 400 operate as evaporators. The upstream heat exchanger 160 and the upstream heat exchanger 162 of the first pipe 400 (both upstream and downstream of the first pipe 1-1 and the first pipe 1-2) operate as evaporators. The downstream heat exchanger 360 and the downstream heat exchanger 362 of the first pipe 400 (both downstream of the first pipe 1-1 and the first pipe 1-2) operate as evaporators.

[0165] The dehumidifying impeller 424 allows for heat exchange between the cooled air flowing in the first duct 400 and the heated air flowing in the third duct 420.

[0166] The air flowing in the first pipe 400 can pass through the upstream heat exchanger 160 of the first-1 pipe and the upstream heat exchanger 162 of the first-2 pipe in sequence and be cooled. That is, the air flowing into the first pipe 400 can pass through the upstream heat exchanger 160 of the first-1 pipe and the upstream heat exchanger 162 of the first-2 pipe in sequence and remove moisture for the first time.

[0167] The air flowing in the first duct 400 can pass through the dehumidifying impeller 424 and have moisture removed a second time. In addition, the temperature of a portion of the air flowing in the first duct 400 can rise when it passes through the dehumidifying impeller 424.

[0168] The air flowing in the first pipe 400 can be cooled by passing sequentially through the downstream heat exchanger 360 of the first-1 pipe and the downstream heat exchanger 362 of the first-2 pipe. That is, the air flowing into the first pipe 400 can be cooled by passing sequentially through the downstream heat exchanger 360 of the first-1 pipe and the downstream heat exchanger 362 of the first-2 pipe for a third time.

[0169] 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 summer, humid air from the outdoor space can be supplied to the indoor space after its humidity has been reduced to a maximum extent through the first duct 400. That is, in summer, at 10g / m³... 3 The absolute humidity above that flows into the first duct 400 can be 2g / m³ 3 The following absolute humidity levels are supplied to the indoor space.

[0170] Air from the indoor space flows into the second duct 410. The second duct 410 can exhaust air to the outdoor space.

[0171] The second pipe heat exchanger 164, located in the second pipe 410, operates as a condenser.

[0172] The air flowing in the second pipe 410 can be discharged to the outdoor space after passing through the second pipe heat exchanger 164 and being heated.

[0173] Outdoor air flows into the third duct 420. The third duct 420 can exhaust air into the outdoor space.

[0174] The third upstream heat exchangers 364 and 366, located in the third pipe 420, can operate as condensers.

[0175] The second auxiliary heat exchanger 364, arranged in the third conduit 420, can operate as a condenser or be stopped. When the second supplementary unit 340 is not operating normally, the second solenoid valve 380 opens the flow path, thereby allowing the second auxiliary heat exchanger 364 to operate as a condenser. That is, when the refrigerant supply to the second heating heat exchanger 366 is not smooth, the second solenoid valve 380 opens the flow path, thereby allowing the second auxiliary heat exchanger 364 to operate as a condenser.

[0176] When the second supplementary unit 340 is operating normally, the second solenoid valve 380 closes the flow path, thereby stopping the second auxiliary heat exchanger 364 from operating. That is, when the refrigerant supply to the second heating heat exchanger 366 is smooth, the second solenoid valve 380 closes the flow path, thereby stopping the second auxiliary heat exchanger 364 from operating.

[0177] The second heating heat exchanger 366, located in the third pipe 420, can operate as a condenser.

[0178] The first auxiliary heat exchanger 260 and the first heating heat exchanger 262 arranged in the third pipe 420 can operate as condensers.

[0179] The first auxiliary heat exchanger 260, arranged in the third pipe 420, can operate as a condenser or be stopped. When the first additional unit 240 is not operating normally, the first solenoid valve 280 opens the flow path, so that the first auxiliary heat exchanger 260 can operate as a condenser.

[0180] When the first auxiliary unit 240 is operating normally, the first solenoid valve 280 closes the flow path, thereby stopping the first auxiliary heat exchanger 260 from operating.

[0181] The first heating heat exchanger 262 arranged in the third pipe 420 can operate as a condenser.

[0182] The heat recovery heat exchanger 264 arranged in the third pipe 420 can operate as an evaporator.

[0183] The air flowing in the third pipe 420 is heated by the second auxiliary heat exchanger 364 or the second heating heat exchanger 366.

[0184] In addition, the air flowing in the third pipe 420 is further heated by the first auxiliary heat exchanger 260 or the first heating heat exchanger 262.

[0185] Additionally, the air flowing in the third conduit 420 can be further heated by the heater 426. The air flowing in the third conduit 420 is heated as it passes sequentially through the second heating heat exchanger 366, the first heating heat exchanger 262, and the heater 426. The heated air flowing in the third conduit 420 is supplied to the dehumidifying impeller 424. The dehumidifying impeller 424 is arranged downstream of the heater 426. Therefore, the air flowing in the third conduit 420 can regenerate the dehumidifying impeller 424.

[0186] Air passing through the dehumidifying impeller 424 can be cooled by passing through the heat recovery heat exchanger 264. Air flowing in the third duct 420 can have some of its temperature and humidity reduced as it passes through the heat recovery heat exchanger 264.

[0187] The flow of refrigerant in the first air conditioning unit 100, the second air conditioning unit 200 and the third air conditioning unit 300 will be described below.

[0188] The flow of refrigerant flowing in the first air conditioning unit 100 will be described.

[0189] 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.

[0190] Another portion of the refrigerant discharged from the first compressor 112 can flow to the second pipe heat exchanger 164 via the first-second switching valve 120 and the first internal switching valve 134. Therefore, the second pipe heat exchanger 164 can operate as a condenser.

[0191] The refrigerant flowing through the first outdoor heat exchanger 114 can flow to the upstream heat exchanger 160 of the first-1 pipe and the upstream heat exchanger 162 of the first-2 pipe. At this time, the refrigerant flowing out of the first outdoor heat exchanger 114 passes through the first internal heat exchanger 132, which can increase the liquid-to-liquid ratio of the refrigerant.

[0192] In addition, the refrigerant flowing out from the second pipe heat exchanger 164 can also flow to the upstream heat exchanger 160 of the first-1 pipe and the upstream heat exchanger 162 of the first-2 pipe.

[0193] The upstream heat exchanger 160 of pipe 1-1 and the upstream heat exchanger 162 of pipe 1-2 can be operated as evaporators.

[0194] The refrigerant flowing out from the upstream heat exchanger 160 of the first-1 pipe and the upstream heat exchanger 162 of the first-2 pipe can flow to the first compressor 112 through the first internal heat exchanger 132.

[0195] The flow of refrigerant flowing in the second air conditioning unit 200 will be described.

[0196] The refrigerant flowing through the second compressor 212 can be referred to as the first refrigerant. The refrigerant flowing through the first additional compressor 242 can be referred to as the second refrigerant. The refrigerant flowing through the first compressor 112 can also be referred to as the first refrigerant.

[0197] 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 operate as a condenser.

[0198] Another portion of the first refrigerant discharged from the second compressor 212 can flow to the first auxiliary heat exchanger 244 via the second-2 switching valve 220 and the second internal switching valve 234. Yet another portion of the first refrigerant discharged from the second compressor 212 can flow to the first auxiliary heat exchanger 260 via the second-2 switching valve 220 and the second internal switching valve 234.

[0199] The first refrigerant flowing out of 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 out of the second outdoor heat exchanger 214 can increase the ratio of liquid refrigerant by passing through the second internal heat exchanger 232.

[0200] The first refrigerant discharged from the first supplementary heating exchanger 244 can also flow to the heat recovery heat exchanger 264.

[0201] The heat recovery heat exchanger 264 can operate as an evaporator. The first refrigerant flowing out of the heat recovery heat exchanger 264 can flow to the second compressor 212 via the second internal heat exchanger 232.

[0202] 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 operate as a condenser.

[0203] The second refrigerant discharged from the first heating heat exchanger 262 can flow to the first additional compressor 242 via the first supplementary heating heat exchanger 244. In the first supplementary heating heat exchanger 244, the first refrigerant can exchange heat with the second refrigerant.

[0204] The flow of refrigerant in the third air conditioning unit 300 is described.

[0205] The refrigerant flowing through the third compressor 312 can be referred to as the first refrigerant. The refrigerant flowing through the second additional compressor 342 can be referred to as the second refrigerant. The first refrigerant flowing through the third compressor 312 can be the same refrigerant as the refrigerant flowing through the second compressor 212. The second refrigerant flowing through the second additional compressor 342 can also be the same refrigerant as the refrigerant flowing through the first additional compressor 242.

[0206] 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 operate as a condenser.

[0207] Another portion of the first refrigerant discharged from the third compressor 312 can flow to the second auxiliary heat exchanger 344 via the third-2 switching valve 320 and the third internal switching valve 334. Yet another portion of the first refrigerant discharged from the third compressor 312 can flow to the second auxiliary heat exchanger 364 via the third-2 switching valve 320 and the third internal switching valve 334.

[0208] The first refrigerant flowing out of the third outdoor heat exchanger 314 can flow through the third internal heat exchanger 332 to the downstream heat exchanger 360 of the first-1 pipe and the downstream heat exchanger 362 of the first-2 pipe. The first refrigerant flowing out of the third outdoor heat exchanger 314 can increase the ratio of liquid refrigerant by passing through the third internal heat exchanger 332.

[0209] The first refrigerant discharged from the second additional heat exchanger 344 can also flow to the downstream heat exchanger 360 of the first-1 pipe and the downstream heat exchanger 362 of the first-2 pipe. Both the downstream heat exchanger 360 of the first-1 pipe and the downstream heat exchanger 362 of the first-2 pipe can operate as evaporators.

[0210] The first refrigerant flowing out from the downstream heat exchanger 360 of the first-1 pipe and the downstream heat exchanger 362 of the first-2 pipe can flow to the third compressor 312 via the third internal heat exchanger 332.

[0211] 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 operate as a condenser.

[0212] The second refrigerant discharged from the second heating heat exchanger 366 can flow to the second additional compressor 342 via the second supplementary heating heat exchanger 344. In the second supplementary heating heat exchanger 344, the first refrigerant can exchange heat with the second refrigerant.

[0213] The following is for reference Figure 6The operation of the air conditioning system of the present invention during normal winter will be described.

[0214] A typical winter can be defined as an outdoor temperature above 4 degrees Celsius. In a typical winter, the outdoor air can be cold and low in humidity. The outdoor air temperature can be below 18 degrees Celsius. Additionally, the outdoor air temperature can be above 4 degrees Celsius. Furthermore, the outdoor air humidity can be higher than the humidity of the air supplied to the indoor space.

[0215] First, using pipelines as a reference, we will explain the operation of multiple heat exchangers.

[0216] The first duct 400 introduces air from the outdoor space and supplies air to the indoor space.

[0217] The upstream heat exchangers 160 and 162 and the downstream heat exchangers 360 and 362 of the first pipe 400 operate as evaporators. The upstream heat exchanger 160 and the upstream heat exchanger 162 of the first pipe 400 (both upstream and downstream of the first pipe 1-1 and the first pipe 1-2) operate as evaporators. The downstream heat exchanger 360 and the downstream heat exchanger 362 of the first pipe 400 (both downstream of the first pipe 1-1 and the first pipe 1-2) operate as evaporators.

[0218] The dehumidifying impeller 424 allows for heat exchange between the cooled air flowing in the first duct 400 and the heated air flowing in the third duct 420.

[0219] The air flowing in the first pipe 400 can pass through the upstream heat exchanger 160 of the first-1 pipe and the upstream heat exchanger 162 of the first-2 pipe in sequence and be cooled. That is, the air flowing into the first pipe 400 can pass through the upstream heat exchanger 160 of the first-1 pipe and the upstream heat exchanger 162 of the first-2 pipe in sequence and remove moisture for the first time.

[0220] The air flowing in the first duct 400 can pass through the dehumidifying impeller 424 and have moisture removed a second time. In addition, the temperature of a portion of the air flowing in the first duct 400 can rise when it passes through the dehumidifying impeller 424.

[0221] The air flowing in the first pipe 400 can be cooled by passing sequentially through the downstream heat exchanger 360 of the first-1 pipe and the downstream heat exchanger 362 of the first-2 pipe. That is, the air flowing into the first pipe 400 can be cooled by passing sequentially through the downstream heat exchanger 360 of the first-1 pipe and the downstream heat exchanger 362 of the first-2 pipe for a third time.

[0222] The flow rate of refrigerant flowing to the downstream heat exchanger 360 of pipe 1-1 and the downstream heat exchanger 362 of pipe 1-2 can be relatively small.

[0223] The air flowing inside the first duct 400 can be converted to an ultra-low humidity state and supplied to the indoor space. In ordinary winter, outdoor air can be supplied to the indoor space after its humidity has been reduced to a maximum extent through the first duct 400. That is, in ordinary winter, at a humidity of 10g / m³... 3 The absolute humidity of the air flowing into the first duct at 400° can be 2 g / m³. 3 The following absolute humidity levels are supplied to the indoor space.

[0224] In addition, during a typical winter, the cold air flowing in from the outdoor space can flow through the first duct 400 and be supplied to the indoor space in a state of increased temperature.

[0225] Air from the indoor space flows into the second duct 410. The second duct 410 can exhaust air to the outdoor space.

[0226] The second pipe heat exchanger 164, which is located in the second pipe 410, can be stopped.

[0227] The air flowing in the second duct 410 can be exhausted to the outdoor space without additional heat exchange.

[0228] Outdoor air flows into the third duct 420. The third duct 420 can exhaust air into the outdoor space.

[0229] The third upstream heat exchangers 364 and 366, located in the third pipe 420, can operate as condensers.

[0230] The second auxiliary heat exchanger 364, arranged in the third pipe 420, can operate as a condenser or be stopped. When the second additional unit 340 is not operating normally, the second solenoid valve 380 opens the flow path, so that the second auxiliary heat exchanger 364 can operate as a condenser.

[0231] When the second additional unit 340 is operating normally, the second solenoid valve 380 closes the flow path, thereby stopping the operation of the second auxiliary heat exchanger 364.

[0232] The second heating heat exchanger 366, located in the third pipe 420, can operate as a condenser.

[0233] The first auxiliary heat exchanger 260 and the first heating heat exchanger 262 arranged in the third pipe 420 can operate as condensers.

[0234] The first auxiliary heat exchanger 260, arranged in the third pipe 420, can operate as a condenser or be stopped. When the first additional unit 240 is not operating normally, the first solenoid valve 280 opens the flow path, so that the first auxiliary heat exchanger 260 can operate as a condenser.

[0235] When the first auxiliary unit 240 is operating normally, the first solenoid valve 280 closes the flow path, thereby stopping the first auxiliary heat exchanger 260 from operating.

[0236] The first heating heat exchanger 262 arranged in the third pipe 420 can operate as a condenser.

[0237] The heat recovery heat exchanger 264 arranged in the third pipe 420 can operate as an evaporator.

[0238] The air flowing in the third pipe 420 is heated by the second auxiliary heat exchanger 364 or the second heating heat exchanger 366.

[0239] In addition, the air flowing in the third pipe 420 is further heated by the first auxiliary heat exchanger 260 or the first heating heat exchanger 262.

[0240] Additionally, the air flowing in the third conduit 420 can be further heated by the heater 426. The air flowing in the third conduit 420 is heated as it passes sequentially through the second heating heat exchanger 366, the first heating heat exchanger 262, and the heater 426. The heated air flowing in the third conduit 420 is supplied to the dehumidifying impeller 424. The dehumidifying impeller 424 is arranged downstream of the heater 426. Therefore, the air flowing in the third conduit 420 can regenerate the dehumidifying impeller 424.

[0241] Air passing through the dehumidifying impeller 424 can be cooled by passing through the heat recovery heat exchanger 264. Air flowing in the third duct 420 can have some of its temperature and humidity reduced as it passes through the heat recovery heat exchanger 264.

[0242] The flow of refrigerant in the first air conditioning unit 100, the second air conditioning unit 200 and the third air conditioning unit 300 will be described below.

[0243] The flow of refrigerant flowing in the first air conditioning unit 100 will be described.

[0244] 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 summer, all 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 be increased.

[0245] The second pipe heat exchanger 164 is in a stopped state, and the refrigerant is not flowing.

[0246] The refrigerant flowing through the first outdoor heat exchanger 114 can flow to the upstream heat exchanger 160 of the first-1 pipe and the upstream heat exchanger 162 of the first-2 pipe. At this time, the refrigerant flowing out of the first outdoor heat exchanger 114 passes through the first internal heat exchanger 132, which can increase the liquid-to-liquid ratio of the refrigerant.

[0247] The upstream heat exchanger 160 of pipe 1-1 and the upstream heat exchanger 162 of pipe 1-2 can be operated as evaporators.

[0248] The refrigerant flowing out from the upstream heat exchanger 160 of the first-1 pipe and the upstream heat exchanger 162 of the first-2 pipe can flow to the first compressor 112 through the first internal heat exchanger 132.

[0249] The flow of refrigerant flowing in the second air conditioning unit 200 will be described.

[0250] The first refrigerant discharged from the second compressor 212 can flow to the first auxiliary heat exchanger 244 via 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 via the second-2 switching valve 220 and the second internal switching valve 234.

[0251] A portion of the first refrigerant discharged from the first additional heat exchanger 244 can flow to the second outdoor heat exchanger 214 via the second internal heat exchanger 232. As it flows through the second internal heat exchanger 232, the proportion of liquid refrigerant in the first refrigerant flowing to the second outdoor heat exchanger 214 can be increased.

[0252] The second outdoor heat exchanger 214 can operate as an evaporator. The first refrigerant flowing out of the second outdoor heat exchanger 214 can flow to the second compressor 212.

[0253] Another portion of the first refrigerant discharged from the first supplementary reheating exchanger 244 can flow to the heat recovery heat exchanger 264. The heat recovery heat exchanger 264 can operate as an evaporator.

[0254] The first refrigerant flowing out from the heat recovery heat exchanger 264 can flow to the second compressor 212 via the second internal heat exchanger 232.

[0255] 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 operate as a condenser.

[0256] The second refrigerant discharged from the first heating heat exchanger 262 can flow to the first additional compressor 242 via the first additional heating heat exchanger 244.

[0257] In the first heat exchanger 244, the first refrigerant can exchange heat with the second refrigerant.

[0258] The amount of the first refrigerant flowing into the first supplementary refrigerant heat exchanger 244 can be increased. Therefore, the efficiency of the second refrigerant undergoing heat exchange in the first supplementary refrigerant heat exchanger 244 can be improved. Consequently, the performance of the first heating heat exchanger 262, which is supplied with the second refrigerant by the first supplementary compressor 242, can be improved.

[0259] The flow of refrigerant in the third air conditioning unit 300 is described.

[0260] The first refrigerant discharged from the third compressor 312 can flow to the second auxiliary heat exchanger 344 via 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 via the third-2 switching valve 320 and the third internal switching valve 334.

[0261] A portion of the first refrigerant discharged from the second heat exchanger 344 can flow to the third outdoor heat exchanger 314 via the third internal heat exchanger 332. As it flows through the third internal heat exchanger 332, the proportion of liquid refrigerant in the first refrigerant flowing to the third outdoor heat exchanger 314 can be increased.

[0262] The third outdoor heat exchanger 314 can operate as an evaporator. The first refrigerant flowing out of the third outdoor heat exchanger 314 can flow to the third compressor 312.

[0263] Another portion of the first refrigerant discharged from the second additional heat exchanger 344 can flow to the downstream heat exchanger 360 of the first-1 pipe and the downstream heat exchanger 362 of the first-2 pipe. Both the downstream heat exchanger 360 of the first-1 pipe and the downstream heat exchanger 362 of the first-2 pipe can operate as evaporators.

[0264] As the proportion of heat exchangers used as evaporators in the heat exchangers through which the first refrigerant flows increases, the performance of heat exchangers 360 downstream of pipe 1-1 and heat exchangers 362 downstream of pipe 1-2 can be reduced.

[0265] The first refrigerant flowing out from the downstream heat exchanger 360 of the first-1 pipe and the downstream heat exchanger 362 of the first-2 pipe can flow to the third compressor 312 via the third internal heat exchanger 332.

[0266] 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 operate as a condenser.

[0267] The second refrigerant discharged from the second heating heat exchanger 366 can flow to the second additional compressor 342 via the second supplementary heating heat exchanger 344. In the second supplementary heating heat exchanger 344, the first refrigerant can exchange heat with the second refrigerant.

[0268] The amount of the first refrigerant flowing into the second supplementary refrigerant heat exchanger 344 can be increased. Therefore, the efficiency of the second refrigerant undergoing heat exchange in the second supplementary refrigerant heat exchanger 344 can be improved. Consequently, the performance of the second heating heat exchanger 366, supplied with the second refrigerant by the second supplementary compressor 342, can be improved.

[0269] The following is for reference Figure 7 The operation of the air conditioning system of the present invention during low-temperature winters will be described.

[0270] A cold winter can refer to an outdoor temperature below 4 degrees Celsius. In a cold winter, the outdoor air can be in a state of extremely low temperature and ultra-low humidity. Additionally, in a cold winter, the humidity of the outdoor air can be less than or equal to the humidity of the air supplied to the indoor space.

[0271] Therefore, the air supplied to the indoor space through the first duct 400 does not require an additional dehumidification process. However, since the air flowing into the first duct 400 is at an extremely low temperature, it can be heated before being supplied to the indoor space.

[0272] First, using pipelines as a reference, we will explain the operation of multiple heat exchangers.

[0273] The first duct 400 introduces air from the outdoor space and supplies air to the indoor space.

[0274] The upstream heat exchangers 160 and 162 and the downstream heat exchangers 360 and 362 of the first pipe 400 can be operated as condensers.

[0275] One of the upstream heat exchangers 160 and 162 of the first pipe 400, located upstream of the first pipe 1-1, can operate as a condenser. The upstream heat exchanger 160 of the first pipe 400 can be stopped. The upstream heat exchanger 162 of the first pipe 400 can operate as a condenser.

[0276] One of the heat exchangers 360 and 362 located downstream of the first pipe 1-1 and the first pipe 1-2 of the first pipe 400 can operate as a condenser. The heat exchanger 360 located downstream of the first pipe 1-1 of the first pipe 400 can be stopped. The heat exchanger 362 located downstream of the first pipe 1-2 of the first pipe 400 can operate as a condenser.

[0277] The dehumidifier rotor 424 can be stopped.

[0278] Air flowing in the first pipe 400 can pass through the upstream heat exchanger 162 of the first-second pipe and be heated. Air flowing into the first pipe 400 can pass through the upstream heat exchanger 162 of the first-second pipe and its temperature rises for the first time.

[0279] The air flowing in the first pipe 400 can pass through the downstream heat exchanger 362 of the first-second pipe and be heated. The air flowing in the first pipe 400 can pass through the downstream heat exchanger 362 of the first-second pipe and its temperature rises.

[0280] The air flowing inside the first duct 400 can be maintained at an ultra-low humidity level and supplied to the indoor space. That is, in cold winters, at 2g / m³... 3 The absolute humidity of the air flowing into the first duct at 400° can be 2 g / m³. 3 The following absolute humidity levels are supplied to the indoor space.

[0281] In addition, during cold winters, cold air flowing in from the outdoor space can flow through the first duct 400 and be supplied to the indoor space in a state of rising temperature.

[0282] Air from the indoor space flows into the second duct 410. The second duct 410 can exhaust air to the outdoor space.

[0283] The second pipe heat exchanger 164 arranged in the second pipe 410 can be stopped. Therefore, the air flowing in the second pipe 410 can flow without additional heat exchange.

[0284] Outdoor air flows into the third duct 420. The third duct 420 can exhaust air into the outdoor space.

[0285] The second heating heat exchanger 366, arranged in the third pipe 420, can operate as a condenser. The first heating heat exchanger 262, arranged in the third pipe 420, can operate as a condenser.

[0286] The heat recovery heat exchanger 264 arranged in the third pipe 420 can operate as an evaporator.

[0287] The second auxiliary heat exchanger 364, located in the third pipe 420, can be shut down. The first auxiliary heat exchanger 260, located in the third pipe 420, can be shut down.

[0288] The dehumidifier rotor 424 and heater 426 arranged in the third pipe 420 can be stopped.

[0289] The air flowing in the third conduit 420 passes sequentially through the second heating heat exchanger 366 and the first heating heat exchanger 262 and is heated. In addition, it can be discharged to the outside in a state where it has been partially cooled when passing through the heat recovery heat exchanger 264.

[0290] In addition, the operation of the downstream heat exchangers 260, 262, and 264 of the third pipe, which are arranged inside the third pipe 420, can also be stopped.

[0291] The flow of refrigerant in the first air conditioning unit 100, the second air conditioning unit 200 and the third air conditioning unit 300 will be described below.

[0292] The flow of refrigerant flowing in the first air conditioning unit 100 will be described.

[0293] The refrigerant discharged from the first compressor 112 can flow to the upstream heat exchanger 162 of the first-second pipeline via the first-second switching valve 120 and the first internal switching valve 134. The upstream heat exchanger 162 of the first-second pipeline can operate as a condenser.

[0294] A portion of the refrigerant flowing out of the upstream heat exchanger 162 of the first-second pipe can flow to the first outdoor heat exchanger 114. The first outdoor heat exchanger 114 can operate as an evaporator. The refrigerant flowing out of the first outdoor heat exchanger 114 can flow to the first compressor 112.

[0295] The flow of refrigerant flowing in the second air conditioning unit 200 will be described.

[0296] The first refrigerant discharged from the second compressor 212 can flow to the first supplementary heat exchanger 244 via the second-2 switching valve 220 and the second internal switching valve 234.

[0297] A portion of the first refrigerant discharged from the first additional heat exchanger 244 can flow to the second outdoor heat exchanger 214 via the second internal heat exchanger 232. As it flows through the second internal heat exchanger 232, the proportion of liquid refrigerant in the first refrigerant flowing to the second outdoor heat exchanger 214 can be increased.

[0298] The second outdoor heat exchanger 214 can operate as an evaporator. The first refrigerant flowing out of the second outdoor heat exchanger 214 can flow to the second compressor 212.

[0299] Another portion of the first refrigerant discharged from the first supplementary reheating exchanger 244 can flow to the heat recovery heat exchanger 264. The heat recovery heat exchanger 264 can operate as an evaporator.

[0300] The first refrigerant flowing out from the heat recovery heat exchanger 264 can flow to the second compressor 212 via the second internal heat exchanger 232.

[0301] 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 operate as a condenser.

[0302] The second refrigerant discharged from the first heating heat exchanger 262 can flow to the first additional compressor 242 via the first additional heating heat exchanger 244.

[0303] In the first heat exchanger 244, the first refrigerant can exchange heat with the second refrigerant.

[0304] In addition, the operation of the second air conditioning unit 200 can also be stopped. That is, the operation of the second compressor 212 and the first additional compressor 242 can also be stopped.

[0305] The flow of refrigerant in the third air conditioning unit 300 is described.

[0306] The first refrigerant discharged from the third compressor 312 can flow to the downstream heat exchanger 362 of the first-second pipeline via the third-second switching valve 320 and the third internal switching valve 334. The downstream heat exchanger 362 of the first-second pipeline can operate as a condenser.

[0307] A portion of the first refrigerant flowing out from the downstream heat exchanger 362 of the first-second pipe can flow to the third outdoor heat exchanger 314 via the third internal heat exchanger 332.

[0308] By passing through the third internal heat exchanger 332, the proportion of liquid refrigerant in the first refrigerant flowing to the third outdoor heat exchanger 314 can be increased.

[0309] The third outdoor heat exchanger 314 can operate as an evaporator. The first refrigerant flowing out of the third outdoor heat exchanger 314 can flow to the third compressor 312.

[0310] Another portion of the first refrigerant flowing out of the downstream heat exchanger 362 of the first-second pipe can flow to the second additional heat exchanger 344.

[0311] The first refrigerant discharged from the second heat exchanger 344 can flow to the third compressor 312 via the third internal heat exchanger 332.

[0312] In the second heat exchanger 344, the first refrigerant can exchange heat with the second refrigerant.

[0313] 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 operate as a condenser.

[0314] The second refrigerant discharged from the second heating heat exchanger 366 can flow to the second additional compressor 342 via the second supplementary heating heat exchanger 344. In the second supplementary heating heat exchanger 344, the first refrigerant can exchange heat with the second refrigerant.

[0315] The following is for reference Figure 8 The operation of the air conditioning system of the present invention during the transition season will be described.

[0316] First, using pipelines as a reference, we will explain the operation of multiple heat exchangers.

[0317] During the transitional season, the air in outdoor spaces can be highly humid. The temperature in outdoor spaces can be set between summer and typical winter temperatures.

[0318] The first duct 400 introduces air from the outdoor space and supplies air to the indoor space.

[0319] The upstream heat exchangers 160 and 162 and the downstream heat exchangers 360 and 362 of the first pipe 400 operate as evaporators. The upstream heat exchanger 160 and the upstream heat exchanger 162 of the first pipe 400 (both upstream and downstream of the first pipe 1-1 and the first pipe 1-2) operate as evaporators. The downstream heat exchanger 360 and the downstream heat exchanger 362 of the first pipe 400 (both downstream of the first pipe 1-1 and the first pipe 1-2) operate as evaporators.

[0320] The dehumidifying impeller 424 allows for heat exchange between the cooled air flowing in the first duct 400 and the heated air flowing in the third duct 420.

[0321] The air flowing in the first pipe 400 can pass through the upstream heat exchanger 160 of the first-1 pipe and the upstream heat exchanger 162 of the first-2 pipe in sequence and be cooled. That is, the air flowing into the first pipe 400 can pass through the upstream heat exchanger 160 of the first-1 pipe and the upstream heat exchanger 162 of the first-2 pipe in sequence and remove moisture for the first time.

[0322] The air flowing in the first duct 400 can pass through the dehumidifying impeller 424 and have moisture removed a second time. In addition, the temperature of a portion of the air flowing in the first duct 400 can rise when it passes through the dehumidifying impeller 424.

[0323] The air flowing in the first pipe 400 can be cooled by passing sequentially through the downstream heat exchanger 360 of the first-1 pipe and the downstream heat exchanger 362 of the first-2 pipe. That is, the air flowing into the first pipe 400 can be cooled by passing sequentially through the downstream heat exchanger 360 of the first-1 pipe and the downstream heat exchanger 362 of the first-2 pipe for a third time.

[0324] 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. During the transitional season, humid air from the outdoor space can be supplied to the indoor space after its humidity has been reduced to a maximum extent through the first duct 400. That is, during the transitional season, at a humidity of 10g / m³... 3 The absolute humidity above that flows into the first duct 400 can be 2g / m³ 3 The following absolute humidity levels are supplied to the indoor space.

[0325] Air from the indoor space flows into the second duct 410. The second duct 410 can exhaust air to the outdoor space.

[0326] The second pipe heat exchanger 164, located in the second pipe 410, operates as a condenser.

[0327] The air flowing in the second pipe 410 can be discharged to the outdoor space after passing through the second pipe heat exchanger 164 and being heated.

[0328] Outdoor air flows into the third duct 420. The third duct 420 can exhaust air into the outdoor space.

[0329] The second auxiliary heat exchanger 364, arranged in the third pipe 420, can operate as a condenser or be stopped. When the second additional unit 340 is not operating normally, the second solenoid valve 380 opens the flow path, so that the second auxiliary heat exchanger 364 can operate as a condenser.

[0330] When the second additional unit 340 is operating normally, the second solenoid valve 380 closes the flow path, thereby stopping the operation of the second auxiliary heat exchanger 364.

[0331] The second heating heat exchanger 366, located in the third pipe 420, can operate as a condenser.

[0332] The first auxiliary heat exchanger 260 and the first heating heat exchanger 262 arranged in the third pipe 420 can operate as condensers.

[0333] The first auxiliary heat exchanger 260, arranged in the third pipe 420, can operate as a condenser or be stopped. When the first additional unit 240 is not operating normally, the first solenoid valve 280 opens the flow path, so that the first auxiliary heat exchanger 260 can operate as a condenser.

[0334] When the first auxiliary unit 240 is operating normally, the first solenoid valve 280 closes the flow path, thereby stopping the first auxiliary heat exchanger 260 from operating.

[0335] The first heating heat exchanger 262 arranged in the third pipe 420 can operate as a condenser.

[0336] The heat recovery heat exchanger 264 arranged in the third pipe 420 can operate as an evaporator.

[0337] The air flowing in the third pipe 420 is heated by the second heating heat exchanger 366.

[0338] In addition, the air flowing in the third pipe 420 is further heated by the first heating heat exchanger 262.

[0339] In addition, the air flowing in the third duct 420 can be further heated by the heater 426 and the dehumidifying impeller 424.

[0340] The dehumidifying impeller 424 is located downstream of the heater 426. Therefore, the air flowing in the third duct 420 can regenerate the dehumidifying impeller 424.

[0341] Air passing through the dehumidifying impeller 424 can be cooled by passing through the heat recovery heat exchanger 264. Air flowing in the third duct 420 can have some of its temperature and humidity reduced as it passes through the heat recovery heat exchanger 264.

[0342] The flow of refrigerant in the first air conditioning unit 100, the second air conditioning unit 200 and the third air conditioning unit 300 will be described below.

[0343] The flow of refrigerant flowing in the first air conditioning unit 100 will be described.

[0344] 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.

[0345] Another portion of the refrigerant discharged from the first compressor 112 can flow to the second pipe heat exchanger 164 via the first-second switching valve 120 and the first internal switching valve 134. Therefore, the second pipe heat exchanger 164 can operate as a condenser.

[0346] The refrigerant flowing through the first outdoor heat exchanger 114 can flow to the upstream heat exchanger 160 of the first-1 pipe and the upstream heat exchanger 162 of the first-2 pipe. At this time, the refrigerant flowing out of the first outdoor heat exchanger 114 passes through the first internal heat exchanger 132, which can increase the liquid-to-liquid ratio of the refrigerant.

[0347] In addition, the refrigerant flowing out from the second pipe heat exchanger 164 can also flow to the upstream heat exchanger 160 of the first-1 pipe and the upstream heat exchanger 162 of the first-2 pipe.

[0348] The upstream heat exchanger 160 of pipe 1-1 and the upstream heat exchanger 162 of pipe 1-2 can be operated as evaporators.

[0349] The refrigerant flowing out from the upstream heat exchanger 160 of the first-1 pipe and the upstream heat exchanger 162 of the first-2 pipe can flow to the first compressor 112 through the first internal heat exchanger 132.

[0350] The flow of refrigerant flowing in the second air conditioning unit 200 will be described.

[0351] A portion of the first refrigerant discharged from the second compressor 212 may flow to the first auxiliary heat exchanger 244 via 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 via the second-2 switching valve 220 and the second internal switching valve 234.

[0352] A portion of the first refrigerant discharged from the first heat exchanger 244 can flow to the second outdoor heat exchanger 214 via the second internal heat exchanger 232. The second outdoor heat exchanger 214 can operate as an evaporator. The first refrigerant flowing out of the second outdoor heat exchanger 214 can flow to the second compressor 212.

[0353] The proportion of liquid refrigerant in the first refrigerant flowing through the second internal heat exchanger 232 to the second outdoor heat exchanger 214 can be increased.

[0354] Another portion of the first refrigerant discharged from the first supplementary heating exchanger 244 can flow to the heat recovery heat exchanger 264.

[0355] The heat recovery heat exchanger 264 can operate as an evaporator. The first refrigerant flowing out of the heat recovery heat exchanger 264 can flow to the second compressor 212 via the second internal heat exchanger 232.

[0356] 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 operate as a condenser.

[0357] The second refrigerant discharged from the first heating heat exchanger 262 can flow to the first additional compressor 242 via the first additional heating heat exchanger 244.

[0358] In the first heat exchanger 244, the first refrigerant can exchange heat with the second refrigerant.

[0359] The flow of refrigerant in the third air conditioning unit 300 is described.

[0360] The refrigerant flowing through the third compressor 312 can be referred to as the first refrigerant. The refrigerant flowing through the second additional compressor 342 can be referred to as the second refrigerant. The first refrigerant flowing through the third compressor 312 can be the same refrigerant as the refrigerant flowing through the second compressor 212. The second refrigerant flowing through the second additional compressor 342 can also be the same refrigerant as the refrigerant flowing through the first additional compressor 242.

[0361] 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 operate as a condenser.

[0362] Another portion of the first refrigerant discharged from the third compressor 312 can flow to the second auxiliary heat exchanger 344 via the third-2 switching valve 320 and the third internal switching valve 334. Yet another portion of the first refrigerant discharged from the third compressor 312 can flow to the second auxiliary heat exchanger 364 via the third-2 switching valve 320 and the third internal switching valve 334.

[0363] The first refrigerant flowing out of the third outdoor heat exchanger 314 can flow through the third internal heat exchanger 332 to the downstream heat exchanger 360 of the first-1 pipe and the downstream heat exchanger 362 of the first-2 pipe. The first refrigerant flowing out of the third outdoor heat exchanger 314 can increase the ratio of liquid refrigerant by passing through the third internal heat exchanger 332.

[0364] The first refrigerant discharged from the second additional heat exchanger 344 can also flow to the downstream heat exchanger 360 of the first-1 pipe and the downstream heat exchanger 362 of the first-2 pipe. Both the downstream heat exchanger 360 of the first-1 pipe and the downstream heat exchanger 362 of the first-2 pipe can operate as evaporators.

[0365] The first refrigerant flowing out from the downstream heat exchanger 360 of the first-1 pipe and the downstream heat exchanger 362 of the first-2 pipe can flow to the third compressor 312 via the third internal heat exchanger 332.

[0366] 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 operate as a condenser.

[0367] The second refrigerant discharged from the second heating heat exchanger 366 can flow to the second additional compressor 342 via the second supplementary heating heat exchanger 344. In the second supplementary heating heat exchanger 344, the first refrigerant can exchange heat with the second refrigerant.

[0368] Reference Figure 9 An air conditioning system according to another embodiment of the present invention will be described.

[0369] With Figure 1 The explanation will focus on the differences between the air conditioning systems described in the text. Figure 9 The unexplained components can be understood as related to Figure 1 The content described in the text is the same.

[0370] The air conditioning system includes a first duct 400 that supplies air from the outdoor space to the 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.

[0371] A pair of first air conditioning units 100a and 100b, each with its own heat exchanger, can be arranged in parallel on the first pipe 400. A pair of third air conditioning units 300a and 300b, each with its own heat exchanger, can also be arranged in parallel on the first pipe 400.

[0372] A pair of heat exchangers for the first air conditioning units 100a and 100b can be arranged in parallel on the second pipe 410.

[0373] A pair of second air conditioning units 200a and 200b, each with its own heat exchanger, can be arranged in parallel on the third pipe 420. A pair of third air conditioning units 300a and 300b, each with its own heat exchanger, can also be arranged in parallel on the third pipe 420.

[0374] Heat exchangers for air conditioning unit 100a and air conditioning unit 100b, as described below, may be arranged in parallel on the first conduit 400.

[0375] The air flowing in the first pipe 400 can flow sequentially through the upstream heat exchangers 160 and 162 and the downstream heat exchangers 360 and 362 of the first pipe.

[0376] The first conduit 400 is provided with first-1 upstream heat exchangers 160a and 160b for each of the first-1 air conditioning unit 100a and the first-2 air conditioning unit 100b. The first conduit 400 is also provided with first-2 upstream heat exchangers 162a and 162b for each of the first-1 air conditioning unit 100a and the first-2 air conditioning unit 100b.

[0377] Downstream heat exchangers 360a and 360b of air conditioning units 300a and 300b, respectively, are arranged in the first conduit 400. Upstream heat exchangers 362a and 362b of air conditioning units 300a and 300b, respectively, are arranged in the first conduit 400.

[0378] A dehumidifying impeller 424 may be arranged in the first duct 400 to exchange heat with the air flowing in the third duct 420.

[0379] The air conditioning system includes a second duct 410 that delivers air from the indoor space to the outdoor space.

[0380] At least one heat exchanger may be arranged in the second duct 410. A second fan 412 that exhausts air to the outside space may also be arranged in the second duct 410.

[0381] The second pipe 410 may be equipped with the second pipe heat exchangers 164a and 164b of the first-1 air conditioning unit 100a and the first-2 air conditioning unit 100b, respectively.

[0382] The air conditioning system includes a third duct 420 that exchanges heat with air in the outside space and exhausts it to the outside space.

[0383] A plurality of heat exchangers are arranged in the third duct 420 to exchange heat with air flowing in from the outside space. A third fan 422 may be arranged in the third duct 420 to introduce air into the outside space and deliver it to the outside space.

[0384] The third conduit 420 is provided with the 3-1 upstream heat exchangers 364a and 364b of the 3-1 air conditioning unit 300a and the 3-2 air conditioning unit 300b respectively. The third conduit 420 is also provided with the 3-2 upstream heat exchangers 366a and 366b of the 3-1 air conditioning unit 300a and the 3-2 air conditioning unit 300b respectively.

[0385] The third conduit 420 is provided with the third-first downstream heat exchangers 260a and 260b of each of the second-first air conditioning unit 200a and the second-second air conditioning unit 200b. The third conduit 420 is also provided with the third-second downstream heat exchangers 262a and 262b of each of the second-first air conditioning unit 200a and the second-second air conditioning unit 200b. The third conduit 420 is further provided with the third-third downstream heat exchangers 264a and 264b of each of the second-first air conditioning unit 200a and the second-second air conditioning unit 200b.

[0386] The preferred embodiments of the present invention have been illustrated and described above. However, the present invention is not limited to the specific embodiments described above. It is obvious that various modifications can be made by those skilled in the art without departing from the spirit of the invention as claimed in the claims, and these modifications should not be understood separately from the technical concept or prospect of the present invention.

Claims

1. An air conditioning system, wherein, include: The first duct transports air flowing from the outdoor space to the indoor space, and a plurality of heat exchangers are arranged inside the first duct. The second pipe delivers air exhausted from the indoor space to the outdoor space; The third duct transports air flowing from the outdoor space to the outdoor space, and a plurality of heat exchangers are arranged inside the third duct. A first air conditioning unit supplies refrigerant to at least one upstream heat exchanger arranged in the first pipe and a second pipe heat exchanger arranged in the second pipe; The second air conditioning unit supplies refrigerant to at least one heat exchanger located downstream of the third conduit. as well as A third air conditioning unit supplies refrigerant to at least one downstream heat exchanger of the first pipe and at least one upstream heat exchanger of the third pipe.

2. The air conditioning system according to claim 1, wherein, It includes a dehumidifying impeller, which is arranged in the first pipe and the third pipe to dehumidify the air in the first pipe.

3. The air conditioning system according to claim 2, wherein, A first heating heat exchanger is arranged in the third duct to heat the air flowing toward the dehumidifying impeller.

4. The air conditioning system according to claim 3, wherein, The second air conditioning unit includes: The second outdoor unit is equipped with a second compressor and a second outdoor heat exchanger; and The first additional unit, driven by the first additional compressor, exchanges heat with the refrigerant discharged from the second outdoor unit; The refrigerant discharged from the first additional compressor flows through the first heating heat exchanger.

5. The air conditioning system according to claim 4, wherein, The second outdoor unit and the first additional unit use different refrigerants. The refrigerant flowing in the second outdoor unit exchanges heat with the refrigerant flowing in the first additional unit in a first additional heating exchanger arranged in the first additional unit.

6. The air conditioning system according to claim 5, wherein, The refrigerant flowing through the second compressor operates at a higher pressure than the refrigerant flowing through the first additional compressor.

7. The air conditioning system according to claim 3, wherein, A heater for heating the air supplied to the dehumidifying impeller is arranged in the third duct; The heater is arranged between the dehumidifying impeller and the first heating heat exchanger.

8. The air conditioning system according to claim 4, wherein, The second outdoor unit includes a heat recovery heat exchanger arranged in the third duct; The heat recovery heat exchanger is located downstream of the dehumidification rotor.

9. The air conditioning system according to claim 4, wherein, The second air conditioning unit further includes a second heat recovery kit that allows heat exchange between the refrigerant flowing out of the second outdoor unit and the refrigerant flowing into the second outdoor unit.

10. The air conditioning system according to claim 9, wherein, The second heat recovery kit includes a second internal heat exchanger that allows refrigerant flowing to the outside of the second outdoor unit via the second outdoor heat exchanger to exchange heat with refrigerant flowing to the inside of the second outdoor unit.

11. The air conditioning system according to claim 1, wherein, The third air conditioning unit includes: The third outdoor unit is equipped with a third compressor and a third outdoor heat exchanger, and allows refrigerant to flow to the heat exchanger located in the first or third pipe; and The second additional unit, driven by the second additional compressor, exchanges heat with the refrigerant discharged from the third outdoor unit and supplies refrigerant to the heat exchanger arranged in the third pipeline.

12. The air conditioning system according to claim 11, wherein, The second additional unit includes a second heating heat exchanger that allows refrigerant discharged from the second additional compressor to exchange heat with air flowing in the third duct.

13. The air conditioning system according to claim 12, wherein, The second heating heat exchanger is arranged upstream of the dehumidifying impeller, which is arranged in the first pipe and the third pipe to dehumidify the air in the first pipe.

14. The air conditioning system according to claim 11, wherein, The third air conditioning unit also includes a third heat recovery kit for exchanging heat between the refrigerant flowing out of the third outdoor unit and the refrigerant flowing into the third outdoor unit.

15. The air conditioning system according to claim 13, wherein, The third outdoor unit includes a heat exchanger arranged downstream of the first duct in the first duct to exchange heat with air flowing from the dehumidifier impeller.

16. An air conditioning system, wherein, include: The first duct transports air flowing from the outdoor space to the indoor space, and a plurality of heat exchangers are arranged inside the first duct. The second pipe delivers air exhausted from the indoor space to the outdoor space; The third duct transports air flowing from the outdoor space to the outdoor space, and a plurality of heat exchangers are arranged inside the third duct. A first air conditioning unit supplies refrigerant to at least one first pipe heat exchanger arranged in the first pipe and a second pipe heat exchanger arranged in the second pipe; The second air conditioning unit supplies refrigerant to at least one heat exchanger arranged in the third duct; as well as A dehumidifying impeller is arranged in the first pipe and the third pipe to dehumidify the air in the first pipe.

17. The air conditioning system according to claim 16, wherein, The first air conditioning unit includes: A first outdoor unit, comprising a first compressor and a first outdoor heat exchanger, supplies refrigerant to the heat exchangers respectively arranged in the first pipe and the second pipe; and The first heat recovery kit enables heat exchange between the refrigerant flowing out of the first outdoor unit and the refrigerant flowing into the first outdoor unit.

18. The air conditioning system according to claim 16, wherein, The second air conditioning unit includes: The second outdoor unit is equipped with a second compressor and a second outdoor heat exchanger, and supplies refrigerant to a plurality of heat exchangers arranged in the third conduit; and The first additional unit, driven by the first additional compressor, exchanges heat with the refrigerant discharged from the second outdoor unit; The first additional unit includes a first heating heat exchanger that allows refrigerant discharged from the first additional compressor to exchange heat with the air in the third conduit.

19. The air conditioning system according to claim 18, wherein, The first heating heat exchanger is arranged upstream of the dehumidifying impeller.

20. The air conditioning system according to claim 18, wherein, The second air conditioning unit further includes a second heat recovery kit that allows heat exchange between the refrigerant flowing out of the second outdoor unit and the refrigerant flowing into the second outdoor unit.

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