Displacement air-conditioning system

Abstract

To provide a displacement air-conditioning system which can solve a problem for coping with contaminants.SOLUTION: A displacement air-conditioning system 100 for exhausting indoor air from an upper part in a room comprises: a first air path in which first return air S1 being a part of the exhausted indoor air circulates; a second air path in which second return air S2 being air except for the first return at S1 out of the exhausted indoor air circulates; a cleaning air adjustment part 23 for performing cooling treatment and cleaning treatment to the first return air S1; a filter 231B for performing the cleaning treatment to the second return air S2; and a blowout port for supplying air-conditioned air which is obtained by mixing the first return air S1 and the second return air S2 to a lower part in the room.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to displacement air conditioning systems. [Background technology]

[0002] A displacement air conditioning system is known as one type of air conditioning system. In a displacement air conditioning system, air with high pollutant concentrations in the living area of ​​an indoor space is successively replaced with fresh air with low pollutant concentrations.

[0003] Patent Document 1 discloses that in a displacement air conditioning system that supplies air directly to the lower occupied area, air that has been supercooled for dehumidification is heated by mixing it with return air from the room. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-017517 A Summary of the Invention [Problem to be solved by the invention]

[0005] In Patent Document 1, the dehumidification problem is solved by mixing return air with air that has been dehumidified by supercooling. On the other hand, since return air from indoors generally contains pollutants, if the air is circulated and supplied to the room, it is necessary to deal with the pollutants.

[0006] It is an object of the present disclosure to provide a displacement air conditioning system that can solve the problem of dealing with pollutants. [Means for solving the problem]

[0007] A replacement air conditioning system according to a first aspect of the present disclosure is a replacement air conditioning system that exhausts indoor air from above a room, and includes a first air path through which first return air, which is a part of the exhausted indoor air, flows, a second air path through which second return air, which is the exhausted indoor air excluding the first return air, flows, a cleaning temperature adjustment unit that performs cooling and purification processes on the first return air, a purification unit that performs purification processes on the second return air, and an air outlet that supplies conditioned air that is a mixture of the first return air and the second return air to the bottom of the room.

[0008] The replacement air conditioning system according to the second aspect of the present disclosure supplies the conditioned air to the lower part of the room by blowing the air downward from the upper part of the room toward the floor.

[0009] The replacement air conditioning system according to the third aspect of the present disclosure blows out the conditioned air at a temperature of 15°C to 26°C and a relative humidity of 80% or less.

[0010] A replacement air conditioning system according to a fourth aspect of the present disclosure performs cooling and purification processes on the first return air and purification processes on the second return air within the same housing.

[0011] A replacement air conditioning system according to a fifth aspect of the present disclosure performs purification treatment on the second return air in an upper part of the room, in a room adjacent to the room, or in a common area adjacent to the room.

[0012] A replacement air conditioning system according to a sixth aspect of the present disclosure mixes outside air with the first return air and then performs the cooling process and the purification process.

[0013] In a replacement air conditioning system according to a seventh aspect of the present disclosure, the cleaning treatment comprises filter collection, ultraviolet irradiation, streamer discharge, or electric dust collection.

[0014] In the replacement air conditioning system according to an eighth aspect of the present disclosure, the purification treatment is performed before the mixing of the first return air and the second return air.

[0015] In the replacement air conditioning system according to a ninth aspect of the present disclosure, the purification process is performed after the mixing of the first return air and the second return air.

[0016] In a replacement air conditioning system according to a tenth aspect of the present disclosure, the purification process for the first return air and the purification process for the second return air are different treatment means.

[0017] According to the present disclosure, the problem of dehumidification can be solved while maintaining cleanliness. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a schematic diagram of a replacement air conditioning system according to a first embodiment. [Diagram 2] FIG. 2 is a block diagram illustrating a configuration of a main part of a control device. [Diagram 3] FIG. 11 is a schematic diagram of a replacement air conditioning system according to a second embodiment. [Figure 4] FIG. 11 is a schematic diagram of a replacement air conditioning system according to a third embodiment. [Diagram 5] FIG. 11 is a schematic diagram of a replacement air conditioning system according to a fourth embodiment. [Figure 6] FIG. 11 is a schematic diagram of a replacement air conditioning system according to a fifth embodiment. [Figure 7] FIG. 13 is a schematic diagram of a replacement air conditioning system according to a sixth embodiment. [Figure 8] FIG. 13 is a schematic diagram of a replacement air conditioning system according to a seventh embodiment. [Figure 9] FIG. 13 is a schematic diagram of a replacement air conditioning system according to an eighth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The present disclosure will be specifically described with reference to the drawings showing the embodiments thereof.

[0020] (Embodiment 1) FIG. 1 is a schematic diagram of a replacement air conditioning system 100 according to the first embodiment. The replacement air conditioning system 100 according to the first embodiment is a system that performs replacement air conditioning by supplying fresh conditioned air to a room 1 surrounded by a ceiling 11, side walls 12, and a floor 13, and discharging indoor air with a high concentration of pollutants. The room 1 is an example of a target space of replacement air conditioning by the replacement air conditioning system 100. The target space is, for example, an indoor space such as an office building, a house, a hospital, a restaurant, a live music venue, a school, a factory, a warehouse, etc. In this embodiment, a case where the replacement air conditioning system 100 is applied to an office building will be described as an example. Note that the target space surrounded by a roof, side walls 12, and a floor 13 instead of the ceiling 11 may be the room 1.

[0021] The replacement air conditioning system 100 comprises an air conditioner 2, an air outlet 3, an air inlet 4, an indoor temperature and humidity sensor 5, a supply air temperature and humidity sensor 6, a control device 7, and the like.

[0022] The air conditioner 2 is installed in a room (e.g., a machine room) adjacent to the living room 1, and performs air conditioning such as cooling the room using a displacement air conditioning method. The air conditioner 2 includes a casing 21, a clean temperature adjustment section 23 housed in the casing 21, and the like. A circulation circuit is formed by connecting the casing 21 to a so-called outdoor unit (not shown) with water piping. Water (circulating water) and a refrigerant are heat exchanged in the outdoor unit to generate cold water, which flows through this circulation circuit. Furthermore, the casing 21 includes a filter 231B (cleaning section) and a fan 233.

[0023] The casing 21 is provided on the outside of the living room 1 (side wall 12). An outside air duct 81, a return air duct 82, and an intake air duct 83 are connected to the casing 21, and an air path is formed inside the casing 21.

[0024] Outside air S3 flows through outside air duct 81, one end of which opens to the outside of the room and the other end of which is connected to the inlet of the air path of casing 21. Return air flows through return air duct 82, one end of which opens into attic 14 between the upper floor or roof and ceiling 11, and the other end of which is connected to the inlet of the air path of casing 21. Here, the return air refers to indoor circulating air sucked from inside room 1 through suction port 4, as described below. Alternatively, return air duct 82 may be directly connected to suction port 4, and the return air may be indoor circulating air sucked from inside room 1.

[0025] Furthermore, one end of the supply air duct 83 is connected to the outlet of the air path of the casing 21, and the other end extends into the attic 14 and communicates with the air outlet 3. Here, the supply air is air supplied from the air conditioner 2 to the interior of the room 1.

[0026] The cleaning temperature adjustment unit 23 performs a cleaning process and a cooling process on the outside air S3 sent from the outside air duct 81 and the first return air S1 described below of the return air sent from the return air duct 82. More specifically, the cleaning temperature adjustment unit 23 includes a filter 231A and a cooling coil 232.

[0027] The filters 231A and 231B perform a purification process to capture, for example, dust in the outside air S3 and the return air and remove contaminants. As described later, the return air from the return air duct 82 is divided into a first return air S1, which is a part of the return air, and a second return air S2, which is the remaining part excluding the first return air S1, in the air conditioner 2, and the filter 231A performs a purification process on the first return air S1 and the outside air S3, and the filter 231B performs a purification process on the second return air S2. That is, the return air duct 82 serves both as a first air path through which the first return air S1 flows and as a first air path through which the second return air S2 flows.

[0028] The filters 231A and 231B perform cleaning processes using different methods. For example, when filter 231B is a high-performance filter capable of collecting very small particles in the air such as pollen, dust, and viruses, filter 231A is a medium-performance filter having lower performance than filter 231B. When filter 231B is a medium-performance filter, filter 231A is made up of a combination of a pre-filter and a medium-performance filter. When filter 231B is a medium-performance filter, filter 231A may be a filter for preventing salt damage. As a result, by performing different purification processes on the first return air S1 and the second return air S2, it becomes possible to perform purification processes suited to each air.

[0029] The cooling coil 232 is a heat exchanger that performs a cooling process. The cooling coil 232 is disposed between the fan 233 and the filter 231A. That is, the cooling coil 232 is provided downstream of the first return air S1 and the outside air S3 from the filter 231A.

[0030] Furthermore, a chilled water supply passage CHS from the outdoor unit and a chilled water return passage CHR from the cooling coil 232 to the outdoor unit are connected to the cooling coil 232. A chilled water valve 234 is provided in the chilled water return passage CHR, and the chilled water valve 234 adjusts the amount of chilled water in response to a control signal from the control device 7.

[0031] The fan 233 is arranged downstream of the first return air S1 and the outside air S3 from the cooling coil 232, and transports a mixture of the first return air S1 and the outside air S3 that have passed through the filter 231A and the cooling coil 232, and the second return air S2 that has passed through the filter 231B, to the supply air duct 83.

[0032] The cleaning process is not limited to dust collection using filters 231A and 231B, but may be any process that removes or inactivates pollutants in the air. Pollutants include, for example, CO2 and viruses contained in human breath. The cleaning process may be, for example, a cleaning process by ultraviolet irradiation using an ultraviolet light emitting device, a cleaning process by streamer discharge using a discharge electrode and an opposing electrode, or a cleaning process by electric dust collection using an electrostatic electric dust collector.

[0033] The air path of the casing 21 has a passage for the outside air S3 and a passage for the return air, and the casing 21 is provided with a return air branching chamber 22, a first mixing chamber 24, and a second mixing chamber 25.

[0034] The return air branching chamber 22 has two motor dampers 221 that can be controlled by the control device 7. The return air sent from the return air duct 82 is divided by the motor damper 221 into the first return air S1 and the second return air S2 as described above. The second return air S2 flows into the filter 231B, and the first return air S1 flows into the first mixing chamber 24.

[0035] In the first mixing chamber 24, the first return air S1 flowing in from the return air branching chamber 22 is mixed with the outside air S3 sent in from the outside air duct 81. The mixed air of the first return air S1 and the outside air S3 flows into the filter 231A.

[0036] In the second mixing chamber 25, the second return air S2 that has passed through the filter 231B is mixed with a mixture of the first return air S1 and the outside air S3 that has passed through the filter 231A and the cooling coil 232. The second mixing chamber 25 is in communication with the fan 233. Hereinafter, the air obtained by mixing the first return air S1, the second return air S2, and the outside air S3 is referred to as conditioned air.

[0037] A plurality of air outlets 3 are provided in ceiling 11. Air outlets 3 blow out conditioned air conveyed via air supply duct 83 toward the interior of room 1. The air outlet 3 has a cylindrical body 31 and a lower end opening 32 formed at the lower end of the cylindrical body 31. The lower end opening 32 is circular and opens toward the floor 13. For example, the air outlet 3 is provided so that the axial direction of the lower end opening 32 is along the vertical direction. As described above, the cylindrical body 31 communicates with the air supply duct 83, and the air outlet 3 blows out conditioned air linearly downward toward the floor 13.

[0038] The air outlet 3 is preferably disposed on the ceiling 11 at a position other than above the living area of ​​the room. The living area of ​​the room is an area where the people in the room are likely to stay for a relatively long period of time, which is specified based on the layout and usage of the room. The position of the air outlet 3 may be determined taking into consideration the positions of the side wall 12, the indoor fixtures, the intake port 4, and other air outlets 3 in the case where multiple air outlets 3 are provided.

[0039] Additionally, a plurality of suction inlets 4 are provided in the ceiling 11. The suction inlets 4 draw indoor air containing pollutants into the attic space 14. The indoor air in the attic space 14 drawn from inside the living room 1 by the suction inlets 4 flows into the opening at the one end of the return air duct 82, and is guided by the return air duct 82 to the air conditioner 2. Additionally, a portion of the indoor air in the attic space 14 is exhausted to the outside.

[0040] The indoor temperature and humidity sensor 5 is a sensor that detects the indoor temperature and relative humidity. For example, a temperature sensor, an ultrasonic sensor, an infrared sensor, etc. can be used as the indoor temperature and humidity sensor 5. The indoor temperature and humidity sensor 5 detects the indoor temperature and relative humidity of the living room 1 at a predetermined time interval, and outputs detection value data indicating the detected temperature and relative humidity to the control device 7 via wired or wireless communication.

[0041] In order to detect the temperature and relative humidity representative of the living space in the living room 1, the indoor temperature and humidity sensor 5 preferably detects the temperature of the space outside the space directly below from the bottom end opening 32 of the air outlet 3 to the floor 13. The space directly below from the bottom end opening 32 of the air outlet 3 to the floor 13 corresponds to a three-dimensional area including a range overlapping with the bottom end opening 32 of the air outlet 3 when viewed in the vertical direction from the bottom end opening 32 of the air outlet 3 to the floor 13. For example, the air outlet 3 is disposed so as to avoid being above the seat positions, and is installed around the seat positions.

[0042] The supply air temperature / humidity sensor 6 is a sensor that detects the temperature and relative humidity of the supply air flowing through the supply air duct 83. The supply air temperature / humidity sensor 6 detects the temperature and relative humidity of the supply air in the supply air duct 83 at predetermined time intervals, and outputs detection value data indicating the detected temperature and relative humidity to the control device 7 via wired or wireless communication.

[0043] The control device 7 controls the operation of the air conditioner 2 to adjust the temperature and relative humidity of the conditioned air blown out from the air outlet 3. 2 is a block diagram illustrating a configuration of a main part of the control device 7. The control device 7 includes a control unit 71, a storage unit 72, an input / output unit 74, and the like.

[0044] The control unit 71 is an arithmetic processing device such as a central processing unit (CPU) or a graphics processing unit (GPU). The control unit 71 executes various computer programs stored in the ROM or the storage unit 72 using memories such as a built-in read only memory (ROM) or a built-in random access memory (RAM), a clock, a counter, and the like.

[0045] The storage unit 72 is a non-volatile storage medium such as a hard disk, an EEPROM (Electrically Erasable Programmable ROM), or a flash memory, and stores various computer programs and data referenced by the control unit 71.

[0046] The input / output unit 74 is an interface for connection with an external device. The control unit 71 is connected to the cold water valve 234, the motor damper 221, the indoor temperature and humidity sensor 5, the supply air temperature and humidity sensor 6, and the fan 233 via the input / output unit 74. Therefore, the control unit 71 can output control signals to the cold water valve 234, the motor damper 221, and the fan 233 via the input / output unit 74, and can receive the detection value data from the indoor temperature and humidity sensor 5 and the supply air temperature and humidity sensor 6.

[0047] That is, the control unit 71 can control the cold water valve 234 to control the flow rate of cold water, can control the motor damper 221 to control the ratio (flow rate) of the first return air S1 and the second return air S2, and can control the fan 233 to control the air volume. The control device 7 may further include a communication unit so as to communicate with the indoor temperature and humidity sensor 5 and the supply air temperature and humidity sensor 6 wirelessly.

[0048] In the displacement air conditioning system 100, the return air sent in from the return air duct 82 is divided into a first return air S1 and a second return air S2 in the return air branching chamber 22. The second return air S2 then flows into the filter 231B and is purified. The first return air S1 also flows into the first mixing chamber 24 and is mixed with the outside air S3 sent in from the outside air duct 81, and the mixed air of the first return air S1 and the outside air S3 flows into the filter 231A and is purified, and then flows into the cooling coil 232. The mixed air of the first return air S1 and the outside air S3 is cooled and dehumidified by the cooling coil 232, becoming supercooled.

[0049] As described above, the second return air S2 that has been subjected to the purification process and the mixed air of the first return air S1 that has been subjected to the purification process and the cooling and dehumidification process and the outside air S3 flow into and are mixed with the second mixing chamber 25. In this manner, the conditioned air that is the mixture of the first return air S1, the second return air S2, and the outside air S3 flows into the air supply duct 83 by the fan 233, and is blown out through the air outlet 3 into the room 1 toward the floor 13.

[0050] Furthermore, the control device 7 of the replacement air conditioning system 100 appropriately adjusts the temperature and relative humidity of the conditioned air blown out from the air outlet 3, depending on the indoor temperature and relative humidity of the room 1 detected by the indoor temperature and humidity sensor 5 and the supply air temperature and relative humidity detected by the supply air temperature and humidity sensor 6. For example, the control unit 71 controls the conditioned air so that it has a temperature in the range of 15°C to 26°C and a relative humidity of 80% or less.

[0051] Specifically, the control device 7 compares the indoor temperature and relative humidity detected by the indoor temperature and humidity sensor 5 and the supply air temperature and humidity sensor 6 with the conditioned air temperature and relative humidity detected, and calculates the target temperature and target relative humidity based on the difference in temperature and relative humidity between the indoor air and the supply air. The control device 7 generates a control signal and outputs it to the chilled water valve 234 and the motor damper 221 so that the temperature and relative humidity of the conditioned air blown out from the air outlet 3 become the derived target temperature and target relative humidity.

[0052] In response to a control signal from the control unit 71, the cold water valve 234 varies the amount of cold water per unit time supplied to the cooling coil 232. In addition, in response to a control signal from the control unit 71, the motor damper 221 adjusts the diameter of the return air passage in the return air branching chamber 22 to change the ratio of the first return air S1 and the second return air S2 in the return air. This adjusts the temperature and relative humidity of the conditioned air.

[0053] As described above, the replacement air conditioning system 100 of this embodiment also performs a purification process on the room temperature second return air S2 that is mixed with the mixed air of the first return air S1 and the outside air S3, so that it is possible to deal with contaminants in the return air and maintain the cleanliness of the conditioned air.

[0054] On the other hand, in a displacement air conditioning system, a temperature region close to the blowing temperature is formed in the occupied area near the blowing range, so it is necessary to steadily blow out a certain amount of air at a low temperature difference with the occupied area so as not to cause discomfort to the occupants, making dehumidification difficult.

[0055] In response to such dehumidification problems, the replacement air conditioning system 100 of this embodiment, as described above, mixes the second return air S2 from inside the living room 1, i.e., the second return air S2 that is hotter than the living area, into the mixed air of the first return air S1 and the outside air S3 that is in a supercooled state due to the cooling and dehumidification process, thereby raising the temperature. Thus, the conditioned air mixed with the first return air S1, the second return air S2, and the outside air S3 becomes hotter than the mixed air of the first return air S1 and the outside air S3 that has been subjected to the cooling and dehumidification process. Therefore, the dehumidification process by supercooling can be performed without consuming reheating energy, while reducing the temperature difference between the conditioned air blown into the living room 1 and the living area.

[0056] Furthermore, in the replacement air conditioning system 100 of this embodiment, as described above, the filters 231A, 231B perform different purification processes, so that the second return air S2 and the mixed air of the first return air S1 and the outside air S3 are subjected to optimal purification processes, respectively. This makes it possible to improve the purification effect of the conditioned air. Furthermore, by distinguishing between the purification processes for air that includes outside air and air that does not, it becomes possible to properly maintain and manage the purification device.

[0057] As described above, in the replacement air conditioning system 100 of this embodiment, the division, mixing, cooling process and purification process of the first return air S1 and the second return air S2 are carried out within the casing 21 of the air conditioner 2. This makes it relatively easy to maintain the replacement air conditioning system 100.

[0058] Furthermore, as described above, in the replacement air conditioning system 100 of this embodiment, the air conditioner 2 is provided outside the room. Therefore, people in the room 1 do not feel uncomfortable due to noise such as operating sounds.

[0059] Without being limited to the above description, the replacement air conditioning system 100 of this embodiment can also adjust the volume of conditioned air by varying the frequency of the fan 233, for example.

[0060] Further, in the above description, an example has been given in which the filters 231A and 231B perform different cleaning processes, but the present invention is not limited to this, and the filters 231A and 231B may be configured to perform the same cleaning process.

[0061] In the above, the cylindrical body 31 is described as having a cylindrical shape, i.e., the cylindrical body 31 is described as having a circular shape in an axial cross section, but the present invention is not limited to this. The cylindrical body 31 may be, for example, elliptical or polygonal in an axial cross section.

[0062] In the above, the air outlet 3 is provided in the ceiling 11, but the present invention is not limited to this. For example, the air outlet 3 may be provided in the side wall 12 or the floor 13.

[0063] (Embodiment 2) FIG. 3 is a schematic diagram of a replacement air conditioning system 100 according to the second embodiment. Similar to embodiment 1, the replacement air conditioning system 100 according to embodiment 2 is a system that performs replacement air conditioning by supplying fresh conditioned air into a room 1 and discharging indoor air with a high concentration of pollutants, and includes an air conditioner 2, an air outlet 3, an air intake 4, an indoor temperature and humidity sensor 5, a supply air temperature and humidity sensor 6, and a control device 7. The indoor temperature and humidity sensor 5, the supply air temperature and humidity sensor 6, and the control device 7 are not shown in Fig. 3.

[0064] The air conditioner 2 performs air conditioning such as cooling the room by using a displacement air conditioning method. The air conditioner 2 includes a casing 21, a clean temperature adjustment unit 23 housed in the casing 21, and the like. The casing 21 is provided on the outside of the living room 1 (side wall 12), and is connected to an outside air duct 81, a return air duct 82, and a supply air duct 83, and the air paths are formed inside the casing 21. The casing 21 further includes a fan 233. The configurations and operations of the outside air duct 81, the return air duct 82, and the supply air duct 83 are similar to those in the first embodiment, and detailed explanations will be omitted.

[0065] The clean temperature adjustment unit 23 includes a filter 231 and a cooling coil 232. As described above, the return air from the return air duct 82 is divided into the first return air S1 and the second return air S2 inside the air conditioner 2. That is, the return air duct 82 serves both as a first air path through which the first return air S1 flows and a second air path through which the second return air S2 flows.

[0066] The filter 231 is disposed in a communicating portion with the air supply duct 83 in the casing 21. The filter 231 performs a purification process of collecting dust from the outside air S3, the first return air S1, and the second return air S2, and removing contaminants. That is, the filter 231 of the second embodiment also serves as the filter 231B (purifying portion) of the first embodiment.

[0067] That is, the replacement air conditioning system 100 according to the second embodiment differs from that according to the first embodiment in the arrangement of the filter 231, the cooling coil 232, and the fan 233. In the replacement air conditioning system 100 according to the second embodiment, the fan 233 is provided between the filter 231 and the cooling coil 232.

[0068] The cooling coil 232 is a heat exchanger that performs a cooling process on the first return air S1 and the outside air S3. The fan 233 transports mixed air, which is a mixture of the first return air S1 and the outside air S3 that have passed through the cooling coil 232 and the second return air S2, to the supply air duct 83 via the filter 231. The configurations and operations of the cooling coil 232 and the fan 233 are similar to those in the first embodiment, and detailed explanations thereof will be omitted.

[0069] The casing 21 is provided with a return air branching chamber 22, a first mixing chamber 24, and a second mixing chamber 25. The return air branching chamber 22 has a motor damper 221 that divides the return air sent from the return air duct 82 into the first return air S1 and the second return air S2 as described above. The second return air S2 flows into the second mixing chamber 25, and the first return air S1 flows into the first mixing chamber 24.

[0070] In the first mixing chamber 24, the first return air S1 flowing in from the return air branching chamber 22 is mixed with the outside air S3 sent in from the outside air duct 81. The mixed air of the first return air S1 and the outside air S3 flows into the cooling coil 232 as described above.

[0071] In the second mixing chamber 25, the second return air S2 flowing in from the return air branching chamber 22 is mixed with a mixture of the first return air S1 and the outside air S3 that has passed through the cooling coil 232. The conditioned air mixed with the first return air S1, the second return air S2, and the outside air S3 is sent to the filter 231 by the fan 233.

[0072] A plurality of air outlets 3 and a plurality of air inlets 4 are provided in the ceiling 11 of the living room 1. The air outlets 3 blow out conditioned air transported via the air supply duct 83 downward from the ceiling 11 of the living room 1. The air inlets 4 suck indoor air containing pollutants into the attic 14. The indoor air in the attic 14 flows into the air conditioner 2 via the return air duct 82. The configurations of the air outlets 3 and air inlets 4 are the same as those in the first embodiment, and detailed explanations will be omitted.

[0073] As in embodiment 1, the replacement air conditioning system 100 of this embodiment also subjects the first return air S1 and the second return air S2 to purification treatment, making it possible to deal with contaminants in the return air and maintain the cleanliness of the conditioned air.

[0074] As described above, in the replacement air conditioning system 100 of this embodiment, the second return air S2, which is hotter than the occupied area, is mixed with the mixed air of the first return air S1 and the outside air S3, which is in a supercooled state due to the cooling and dehumidification process, to raise the temperature. Therefore, the conditioned air obtained by mixing the first return air S1, the second return air S2, and the outside air S3 becomes hotter than the mixed air of the first return air S1 and the outside air S3 that has been subjected to the cooling and dehumidification process. Therefore, the dehumidification process by supercooling can be performed without consuming reheating energy, while reducing the temperature difference between the conditioned air blown into the room 1 and the occupied area.

[0075] Furthermore, in the displacement air conditioning system 100 of this embodiment, as described above, the purification process is performed after the first return air S1 and the second return air S2 are mixed, so that the purification effect of the conditioned air can be improved in the purification process. Furthermore, by reducing the number of filters, maintenance becomes relatively easy.

[0076] In the replacement air conditioning system 100 of the present embodiment, the division, mixing, cooling process and purification process of the first return air S1 and the second return air S2 are carried out within the casing 21 of the air conditioner 2. Therefore, maintenance and management of the replacement air conditioning system 100 is relatively easy.

[0077] Furthermore, in the replacement air conditioning system 100 of this embodiment, the air conditioner 2 is provided outside the room. Therefore, people in the room 1 do not feel uncomfortable due to noise such as operating sounds.

[0078] The same parts as those in the first embodiment are given the same reference numerals and detailed explanations are omitted.

[0079] (Embodiment 3) FIG. 4 is a schematic diagram of a replacement air conditioning system 100 according to the third embodiment. Similar to embodiment 1, the replacement air conditioning system 100 according to embodiment 3 is a system that performs replacement air conditioning by supplying fresh conditioned air into a room 1 and discharging indoor air with a high concentration of pollutants, and includes an air conditioner 2, an air outlet 3, an air intake 4, an indoor temperature and humidity sensor 5, a supply air temperature and humidity sensor 6, and a control device 7. The indoor temperature and humidity sensor 5, the supply air temperature and humidity sensor 6, and the control device 7 are not shown in Fig. 4.

[0080] The air conditioner 2 performs air conditioning such as heating and cooling of the room by a displacement air conditioning method. In the replacement air conditioning system 100 according to the third embodiment, the air conditioner 2 is provided above the living room 1 or in the attic 14.

[0081] The air conditioner 2 includes a casing 21, a clean temperature adjustment unit 23 housed in the casing 21, a filter 231B, a fan 233, and the like. An outside air duct 81, a return air inlet 84, and an air supply duct 83 are connected to the casing 21, and an air path (not shown) is formed inside the casing 21.

[0082] Outdoor air duct 81 communicates with the outside of room 1 via side wall 12, and outdoor air S3 flows through it. That is, one end of outdoor air duct 81 opens to the outside of room 1, and the other end is connected to an inlet of the air path of casing 21. Return air also flows into return air inlet 84, one end of which opens to ceiling space 14, and the other end is connected to an inlet of the air path of casing 21. Furthermore, supply air duct 83 is provided in ceiling space 14, one end of which is connected to an outlet of the air path of casing 21, and communicates with multiple air outlets 3.

[0083] The cleaning temperature adjustment unit 23 performs a cleaning process and a cooling process on the outside air S3 sent from the outside air duct 81 and the first return air S1 of the return air flowing in from the return air inlet 84. The cleaning temperature adjustment unit 23 includes a filter 231A and a cooling coil 232.

[0084] The replacement air conditioning system 100 according to the third embodiment differs from the first embodiment in the arrangement of the filters 231A, 231B, the cooling coil 232, and the fan 233. In the replacement air conditioning system 100 according to the third embodiment, the fan 233 is provided between the filter 231A and the cooling coil 232. That is, the cooling coil 232 is provided on the most downstream side of the mixed air of the first return air S1 and the outside air S3. The configurations and operations of the filters 231A and 231B, the cooling coil 232, and the fan 233 are similar to those of the first embodiment, and detailed description thereof will be omitted.

[0085] In the casing 21, a return air branching chamber 22, a first mixing chamber 24, and a second mixing chamber 25 are provided, similarly to the first embodiment.

[0086] The return air branching chamber 22 is provided with a motor damper 221, and the return air flowing in from the return air inlet 84 is divided by the motor damper 221 into a first return air S1 and a second return air S2, the second return air S2 flows into the filter 231B, and the first return air S1 flows into the first mixing chamber 24. That is, the return air duct 82 serves both as a first air path through which the first return air S1 flows and a second air path through which the second return air S2 flows.

[0087] In the first mixing chamber 24, the first return air S1 flowing in from the return air branching chamber 22 is mixed with the outside air S3 sent in from the outside air duct 81. The mixed air of the first return air S1 and the outside air S3 flows into the filter 231A.

[0088] In the second mixing chamber 25, the second return air S2 that has passed through the filter 231B is mixed with a mixture of the first return air S1 and the outside air S3 that has passed through the filter 231A and the cooling coil 232. The conditioned air in which the first return air S1, the second return air S2, and the outside air S3 are mixed flows into the supply air duct 83.

[0089] A plurality of air outlets 3 and a plurality of air inlets 4 are provided in the ceiling 11 of the living room 1. The air outlets 3 blow out conditioned air transported via the air supply duct 83 downward from the ceiling 11 of the living room 1. The air inlets 4 suck indoor air containing pollutants into the attic space 14. The indoor air in the attic space 14 flows into the air conditioner 2 via the return air inlet 84. The configurations of the air outlets 3 and the air inlets 4 are the same as those in the first embodiment, and detailed explanations will be omitted.

[0090] In the displacement air conditioning system 100, the return air flowing into the ceiling space 14 is divided into a first return air S1 and a second return air S2 in the return air branching chamber 22. The second return air S2 then flows into the filter 231B and is purified, and the first return air S1 flows into the first mixing chamber 24 and is mixed with the outside air S3 from the outside air duct 81. The mixed air of the first return air S1 and the outside air S3 flows into the filter 231A and is purified, and then flows into the cooling coil 232 by the fan 233. The mixed air of the first return air S1 and the outside air S3 is cooled and dehumidified by the cooling coil 232, and then mixed with the purified second return air S2 in the second mixing chamber 25. In this manner, the conditioned air mixed with the first return air S1, the second return air S2, and the outside air S3 flows into the supply air duct 83 and is blown out through the air outlet 3 into the room 1 toward the floor 13.

[0091] As described above, the replacement air conditioning system 100 of this embodiment also performs a purification process on the room temperature second return air S2 that is mixed with the mixed air of the first return air S1 and the outside air S3, so that it is possible to deal with contaminants in the return air and maintain the cleanliness of the conditioned air.

[0092] As described above, in the displacement air conditioning system 100 of this embodiment, the second return air S2, which is hotter than the occupied area, is mixed with the mixed air of the first return air S1 and the outside air S3 that has been supercooled by the cooling and dehumidifying process, and the temperature is raised. Therefore, the conditioned air obtained by mixing the first return air S1, the second return air S2, and the outside air S3 becomes hotter than the mixed air of the first return air S1 and the outside air S3 that has been subjected to the cooling and dehumidifying process. Therefore, the dehumidification process by supercooling can be performed without consuming reheating energy, while reducing the temperature difference between the conditioned air blown into the room 1 and the occupied area.

[0093] Furthermore, in the replacement air conditioning system 100 of this embodiment, as described above, the division, mixing, cooling process and purification process of the first return air S1 and the second return air S2 are carried out within the casing 21 of the air conditioner 2. Therefore, maintenance and management of the replacement air conditioning system 100 is relatively easy.

[0094] As described above, in the replacement air conditioning system 100 of this embodiment, the air conditioner 2 is provided in the attic 14, and the division, mixing, cooling process and purification process of the first return air S1 and the second return air S2 are carried out above the living room 1. This eliminates the need to provide a separate machine room or the like, leading to a reduction in installation space. In addition, it eliminates the need to transport the first return air S1 and the second return air S2 to the casing 21 outside the living room 1, leading to a reduction in transport power.

[0095] The same parts as those in the first embodiment are given the same reference numerals and detailed explanations are omitted.

[0096] (Embodiment 4) FIG. 5 is a schematic diagram of a replacement air conditioning system 100 according to the fourth embodiment. Similar to embodiment 1, the replacement air conditioning system 100 according to embodiment 4 is a system that performs replacement air conditioning by supplying fresh conditioned air into a room 1 and discharging indoor air with a high concentration of pollutants, and includes an air conditioner 2, an air outlet 3, an air intake 4, an indoor temperature and humidity sensor 5, a supply air temperature and humidity sensor 6, and a control device 7. The indoor temperature and humidity sensor 5, the supply air temperature and humidity sensor 6, and the control device 7 are not shown in Fig. 5.

[0097] The air conditioner 2 performs air conditioning such as heating and cooling in a room using a displacement air conditioning method. The air conditioner 2 includes a casing 21, a clean temperature adjustment unit 23, a fan 233A, and the like housed in the casing 21. The casing 21 is provided on the outside of the living room 1 (side wall 12). An outside air duct 81, a return air duct 82, and a supply air duct 83 are connected to the casing 21, and an air path (not shown) is formed inside the casing 21.

[0098] One end of outside air duct 81 opens to the outside, and the other end is connected to the inlet of the air path of casing 21. Moreover, one end of return air duct 82 opens to ceiling space 14, and the other end is connected to the inlet of the air path of casing 21. Furthermore, one end of supply air duct 83 is connected to the outlet of the air path of casing 21, and the other end extends into ceiling space 14 and communicates with air outlet 3.

[0099] The cleaning temperature adjustment unit 23 includes a filter 231A and a cooling coil 232. The filter 231A performs a cleaning process on the first return air S1 and the outside air S3, which are parts of the return air from the return air duct 82. The return air duct 82 is a first air path through which the first return air S1 flows.

[0100] The cooling coil 232 is provided downstream of the first return air S1 and the outside air S3 from the filter 231A, and the fan 233A is disposed downstream of the first return air S1 and the outside air S3 from the cooling coil 232. That is, the cooling coil 232 is disposed between the fan 233A and the filter 231A.

[0101] The configurations and operations of the filter 231A, the cooling coil 232, and the fan 233A are similar to those of the first embodiment, and detailed description thereof will be omitted.

[0102] The casing 21 is provided with a first mixing chamber 24. In the first mixing chamber 24, first return air S1, which is a part of the return air from the return air duct 82, and outside air S3 sent from the outside air duct 81 are mixed. The mixed air of the first return air S1 and the outside air S3 flows into the filter 231A. The fan 233A sends the mixed air of the first return air S1 and the outside air S3 to the supply air duct 83.

[0103] A plurality of air outlets 3 and a plurality of air inlets 4 are provided in the ceiling 11 of the living room 1. The air outlets 3 blow out conditioned air transported via the air supply duct 83 downward from the ceiling 11 of the living room 1. The air inlets 4 suck indoor air containing pollutants into the attic space 14. The indoor air in the attic space 14 flows into the return air duct 82. The configurations of the air outlets 3 and air inlets 4 are the same as those in the first embodiment, and detailed explanations will be omitted.

[0104] The replacement air conditioning system 100 according to the fourth embodiment includes a connecting duct 85 that connects the return air duct 82 and the supply air duct 83. That is, one end of the connecting duct 85 communicates with the return air duct 82, and the other end of the connecting duct 85 communicates with the supply air duct 83. The connecting duct 85 is provided near the side wall 12 and on the outside of the side wall 12.

[0105] The connecting duct 85 has, for example, a cylindrical shape, and a filter 231B (purifying section) and a fan 233B are disposed within the connecting duct 85. The filter 231B is disposed near the one end of the connecting duct 85, and the fan 233B is disposed near the other end of the connecting duct 85. Since the connecting duct 85 is provided outside the room, it is possible to inspect the filter 231B and the fan 233B without entering the living room 1. The connecting duct 85 is a second air path through which the second return air S2 flows.

[0106] Of the return air, the second return air S2 flows to the connecting duct 85, and the first return air S1 flows to the air conditioner 2, as described above. That is, the return air that flows into the return air duct 82 is divided into the first return air S1 and the second return air S2, the second return air S2 flows to the connecting duct 85, and the first return air S1 flows to the air conditioner 2.

[0107] The second return air S2 that has flowed into the connecting duct 85 is caused to flow to the filter 231B by the fan 233B. The filter 231B performs a cleaning process to collect dust in the second return air S2 and remove contaminants. As in the first embodiment, the filter 231B is subjected to a cleaning process by a means different from that of the filter 231A. The second return air S2 that has passed through the filter 231B and been subjected to a purification process is caused to flow into the supply air duct 83 via the other end of the connecting duct 85 by the fan 233B.

[0108] As described above, the replacement air conditioning system 100 of this embodiment also performs a purification process on the room temperature second return air S2 that is mixed with the mixed air of the first return air S1 and the outside air S3, so that it is possible to deal with contaminants in the return air and maintain the cleanliness of the conditioned air.

[0109] As described above, in the replacement air conditioning system 100 of this embodiment, the mixed air of the first return air S1 and the outside air S3 that have been subjected to the cooling and dehumidification process flows into the intake air duct 83 by the fan 233A, and then the second return air S2 that has been subjected to the purification process by the filter 231B and is hotter than the occupied area is mixed and heated near the other end of the connecting duct 85. Therefore, the conditioned air mixed with the first return air S1, the second return air S2, and the outside air S3 becomes hotter than the mixed air of the first return air S1 and the outside air S3 that have been subjected to the cooling and dehumidification process. Therefore, the dehumidification process by supercooling can be performed without consuming reheating energy while reducing the temperature difference between the conditioned air blown into the room 1 and the occupied area.

[0110] Furthermore, in the replacement air conditioning system 100 of this embodiment, as described above, the division, mixing, cooling process, and purification process of the first return air S1 and the second return air S2 are performed outdoors, so that people in the room 1 do not feel uncomfortable due to noise such as operating sounds.

[0111] As described above, in the replacement air conditioning system 100 of this embodiment, after the return air flows from the ceiling space 14 into the return air duct 82 and before it reaches the air conditioner 2 (casing 21), it is divided into the first return air S1 and the second return air S2, and only the first return air S1 is sent to the casing 21, and the second return air S2 flows into the supply air duct 83 via the connecting duct 85 and is mixed with the mixed air of the first return air S1 and the outside air S3 that have been subjected to the cooling and dehumidification treatment. Therefore, there is no need to transport the first return air S1 and the second return air S2 to the air conditioner 2, and only the first return air S1 is sent to the casing 2. This makes it possible to reduce the power required to transport the return air.

[0112] The same parts as those in the first embodiment are given the same reference numerals and detailed explanations are omitted.

[0113] (Embodiment 5) FIG. 6 is a schematic diagram of a replacement air conditioning system 100 according to the fifth embodiment. Similar to embodiment 1, the replacement air conditioning system 100 according to embodiment 5 is a system that performs replacement air conditioning by supplying fresh conditioned air into a room 1 and discharging indoor air with a high concentration of pollutants, and includes an air conditioner 2, an air outlet 3, an air intake 4, an indoor temperature and humidity sensor 5, a supply air temperature and humidity sensor 6, and a control device 7. The indoor temperature and humidity sensor 5, the supply air temperature and humidity sensor 6, and the control device 7 are not shown in Fig. 6.

[0114] The air conditioner 2 performs air conditioning such as heating and cooling of a room by a displacement air conditioning method. The air conditioner 2 includes a casing 21, a clean temperature adjustment unit 23 housed in the casing 21, a fan 233A, and the like. The casing 21 is provided on the outside of the living room 1 (side wall 12). An outside air duct 81, a return air duct 82, and an intake air duct 83 are connected to the casing 21, and an air path (not shown) is formed inside the casing 21.

[0115] The configurations and operations of the casing 21 and the clean temperature adjustment section 23, as well as the configurations and operations of the outside air duct 81, the return air duct 82 and the supply air duct 83 are similar to those in the fourth embodiment, and therefore will not be described in detail.

[0116] Additionally, a plurality of air outlets 3 and a plurality of air inlets 4 are provided on the ceiling 11 of the living room 1. The air outlets 3 blow out conditioned air transported via the air supply duct 83 downward from the ceiling 11 of the living room 1. The air inlets 4 draw indoor air containing pollutants into the attic space 14. The indoor air in the attic space 14 flows into the return air duct 82. The configurations of the air outlets 3 and air inlets 4 are similar to those in the fourth embodiment, and detailed explanations will be omitted.

[0117] The replacement air conditioning system 100 according to the fifth embodiment includes a connecting duct 85 that connects the return air duct 82 and the supply air duct 83. That is, one end of the connecting duct 85 communicates with the return air duct 82, and the other end of the connecting duct 85 communicates with the supply air duct 83. The connecting duct 85 is provided on the outside of the side wall 12.

[0118] A fan 233B is disposed in the connecting duct 85. A portion of the return air flows into the connecting duct 85, and the other portion flows into the air conditioner 2. That is, a portion of the return air flowing into the connecting duct 85 is the second return air S2, and the other portion of the return air flowing to the air conditioner 2 via the return air duct 82 is the first return air S1. That is, the return air duct 82 is a first air path through which the first return air S1 flows, and the connecting duct 85 is a second air path through which the second return air S2 flows.

[0119] In the replacement air conditioning system 100 of this embodiment, filter 231B (purifying section) is disposed in supply air duct 83. Filter 231B is disposed near side wall 12, on the inside of side wall 12. Filter 231B performs a purification process to collect dust and remove contaminants. Filters 231B and 231A may be configured to perform purification processes by different means, or may be configured to perform purification processes by the same means. Furthermore, by distinguishing between the purification processes for air that includes outside air and air that does not include outside air, appropriate maintenance and management of the purification device is possible.

[0120] The second return air S2 that has flowed into the connecting duct 85 is caused to flow to the air supply duct 83 by the fan 233B, and mixed with a mixture of the first return air S1 that has been subjected to cooling and dehumidification treatment and the outside air S3 that is sent from the air conditioner 2. The conditioned air that is a mixture of the first return air S1, the second return air S2, and the outside air S3 flows to the filter 231B, and is subjected to purification treatment by the filter 231B.

[0121] In the replacement air conditioning system 100 of this embodiment, the filter 231B performs a purification process on the conditioned air which is a mixture of the first return air S1, the second return air S2, and the outside air S3, so that it is possible to deal with contaminants in the return air and maintain the cleanliness of the conditioned air.

[0122] As described above, in the replacement air conditioning system 100 of this embodiment, the mixed air of the first return air S1 and the outside air S3 that have been subjected to the cooling and dehumidification process flows into the supply air duct 83 by the fan 233A, and then the second return air S2 that is hotter than the occupied area is mixed with the mixed air near the other end of the connecting duct 85, and the temperature is increased. Therefore, the conditioned air mixed with the first return air S1, the second return air S2, and the outside air S3 becomes hotter than the mixed air of the first return air S1 and the outside air S3 that have been subjected to the cooling and dehumidification process. Therefore, the dehumidification process by supercooling can be performed without consuming reheating energy, while reducing the temperature difference between the conditioned air blown into the room 1 and the occupied area.

[0123] Furthermore, in the replacement air conditioning system 100 of this embodiment, as described above, the division, mixing and cooling of the first return air S1 and the second return air S2 are performed outdoors. Therefore, people in the room 1 do not feel uncomfortable due to noise such as operating sounds.

[0124] Then, in the replacement air conditioning system 100 of this embodiment, similarly to the fourth embodiment, after the return air flows from the attic space 14 into the return air duct 82 and before it reaches the air conditioner 2 (casing 21), it is divided into first return air S1 and second return air S2, and only the first return air S1 is sent to the casing 2. Therefore, the power required to transport the return air to the air conditioner 2 can be reduced.

[0125] The same parts as those in the fourth embodiment are given the same reference numerals and detailed description thereof will be omitted.

[0126] (Embodiment 6) FIG. 7 is a schematic diagram of a replacement air conditioning system 100 according to the sixth embodiment. Similar to embodiment 5, the replacement air conditioning system 100 according to embodiment 6 is a system that performs replacement air conditioning by supplying fresh conditioned air into a room 1 and discharging indoor air with a high concentration of pollutants, and includes an air conditioner 2, an air outlet 3, an air intake 4, an indoor temperature and humidity sensor 5, a supply air temperature and humidity sensor 6, and a control device 7. The indoor temperature and humidity sensor 5, supply air temperature and humidity sensor 6, and control device 7 are not shown in Fig. 7.

[0127] The air conditioner 2 performs air conditioning such as heating and cooling in a room using a displacement air conditioning method. The air conditioner 2 includes a casing 21, a clean temperature adjustment unit 23, a fan 233A, and the like, which are housed in the casing 21. The casing 21 is provided on the outside of the living room 1 (side wall 12). An outside air duct 81, a return air duct 82, and a supply air duct 83 are connected to the casing 21, and an air path (not shown) is formed inside the casing 21.

[0128] The configurations and operations of the casing 21 and the clean temperature adjustment section 23, as well as the configurations and operations of the outside air duct 81, the return air duct 82 and the supply air duct 83 are similar to those in the fifth embodiment, and therefore will not be described in detail.

[0129] Additionally, a plurality of air outlets 3 and a plurality of air inlets 4 are provided in the ceiling 11 of the living room 1. The air outlets 3 blow out the conditioned air transported via the air supply duct 83 downward from the ceiling 11 of the living room 1. The air inlets 4 draw indoor air containing pollutants into the attic space 14. The indoor air in the attic space 14 flows into the return air duct 82. The configurations of the air outlets 3 and air inlets 4 are the same as those in the fifth embodiment, and detailed explanations will be omitted.

[0130] Furthermore, the replacement air conditioning system 100 of this embodiment is equipped with a connecting duct 85 that connects the return air duct 82 and the supply air duct 83, and a fan 233B is disposed in the connecting duct 85. The return air duct 82 is a first air path through which the first return air S1 flows, and the connecting duct 85 is a second air path through which the second return air S2 flows. The configurations and operations of the connecting duct 85 and the fan 233B are similar to those of the fifth embodiment, and detailed explanations will be omitted.

[0131] In the replacement air conditioning system 100 of this embodiment, a filter 231B (cleaning section) is provided at each air outlet 3. Each filter 231B is provided inside the cylindrical body 31, and performs a cleaning process to capture dust and remove pollutants. The filters 231B and 231A may be configured to perform cleaning processes by different means, or may be configured to perform cleaning processes by the same means. This allows appropriate maintenance and management of each cleaning device.

[0132] The second return air S2 that has flowed into the connecting duct 85 flows into the air supply duct 83 by the fan 233B, and is mixed with a mixture of the cooled and dehumidified first return air S1 and the outside air S3 sent from the air conditioner 2. Thereafter, the conditioned air that is a mixture of the first return air S1, the second return air S2, and the outside air S3 flows through the air supply duct 83 and flows into each air outlet 3. The conditioned air that has flowed into each air outlet 3 is purified by the filter 231B, and then blown out into the room 1 toward the floor 13.

[0133] In the replacement air conditioning system 100 of this embodiment, the filter 231B performs a purification process on the conditioned air which is a mixture of the first return air S1, the second return air S2, and the outside air S3, so that it is possible to deal with contaminants in the return air and maintain the cleanliness of the conditioned air.

[0134] As described above, in the displacement air conditioning system 100 of this embodiment, the mixed air of the first return air S1 and the outside air S3 that have been subjected to the cooling and dehumidification treatment and that has been flowed into the supply air duct 83 from the air conditioner 2 is mixed with the second return air S2 that is hotter than the occupied area near the connecting duct 85, and the temperature is increased. Therefore, the conditioned air mixed with the first return air S1, the second return air S2, and the outside air S3 becomes hotter than the mixed air of the first return air S1 and the outside air S3 that have been subjected to the cooling and dehumidification treatment. Therefore, the dehumidification treatment by supercooling can be performed without consuming reheating energy, while reducing the temperature difference between the conditioned air blown into the room 1 and the occupied area.

[0135] Furthermore, in the replacement air conditioning system 100 of this embodiment, the division, mixing and cooling of the first return air S1 and the second return air S2 are also performed outdoors. Therefore, people in the room 1 do not feel uncomfortable due to noise such as operating sounds.

[0136] Then, in the replacement air conditioning system 100 of this embodiment, similarly to the fourth and fifth embodiments, after the return air flows from the attic space 14 into the return air duct 82 and before it reaches the air conditioner 2 (casing 21), it is divided into first return air S1 and second return air S2, and only the first return air S1 is sent to the casing 2. Therefore, the power required to transport the return air to the air conditioner 2 can be reduced.

[0137] The same parts as those in the fifth embodiment are given the same reference numerals and detailed explanations are omitted.

[0138] (Embodiment 7) FIG. 8 is a schematic diagram of a replacement air conditioning system 100 according to the seventh embodiment. Similar to embodiment 1, the replacement air conditioning system 100 according to embodiment 7 is a system that performs replacement air conditioning by supplying fresh conditioned air into a room 1 and discharging indoor air with a high concentration of pollutants, and includes an air conditioner 2, an air outlet 3, an air intake 4, an indoor temperature and humidity sensor 5, a supply air temperature and humidity sensor 6, and a control device 7. The indoor temperature and humidity sensor 5, supply air temperature and humidity sensor 6, and control device 7 are not shown in Fig. 8.

[0139] The air conditioner 2 performs air conditioning such as heating and cooling in a room using a displacement air conditioning method. The air conditioner 2 includes a casing 21, a clean temperature adjustment unit 23, a fan 233A, and the like, which are housed in the casing 21. The casing 21 is provided on the outside of the living room 1 (side wall 12). An outside air duct 81, a return air duct 82, and a supply air duct 83 are connected to the casing 21, and an air path (not shown) is formed inside the casing 21.

[0140] The configurations and operations of the casing 21 and the clean temperature adjustment section 23, as well as the configurations and operations of the outside air duct 81, the return air duct 82 and the supply air duct 83 are similar to those of the fifth and sixth embodiments, and therefore will not be described in detail.

[0141] Additionally, a plurality of air outlets 3 and a plurality of air inlets 4 are provided on the ceiling 11 of the living room 1. The air outlets 3 blow out the conditioned air transported via the air supply duct 83 downward from the ceiling 11 of the living room 1. The air inlets 4 draw indoor air containing pollutants into the attic space 14. The configurations of the air outlets 3 and air inlets 4 are similar to those of the fifth and sixth embodiments, and detailed explanations will be omitted.

[0142] In the replacement air conditioning system 100 according to the seventh embodiment, an inflow duct 86 into which a portion of the indoor air in the attic space 14 (second return air S2) flows is provided in the supply air duct 83. That is, one end of the inflow duct 86 opens to the attic space 14, and the other end of the inflow duct 86 is connected to the supply air duct 83. The inflow duct 86 is provided inside the attic space 14, near the side wall 12.

[0143] The inflow duct 86 has, for example, a cylindrical shape, and a filter 231B (cleaning section) and a fan 233B are disposed inside the inflow duct 86. The filter 231B is disposed near the one end of the inflow duct 86, and the fan 233B is disposed near the other end of the inflow duct 86.

[0144] A portion of the return air flowing toward the return air duct 82 flows into the inlet duct 86, and the other portion flows into the air conditioner 2. That is, a portion of the return air flowing into the inlet duct 86 is the second return air S2, and the other portion of the return air flowing to the air conditioner 2 via the return air duct 82 is the first return air S1. In other words, the return air duct 82 is a first air path through which the first return air S1 flows, and the inlet duct 86 is a second air path through which the second return air S2 flows.

[0145] The second return air S2 that has flowed into the inlet duct 86 is directed by the fan 233B to the filter 231B, where it is subjected to a purification process. As in the first embodiment, the filter 231B is subjected to a purification process by a means different from that of the filter 231A. Furthermore, by distinguishing between the purification processes for air that includes outside air and air that does not include outside air, it is possible to appropriately maintain and manage the purification device.

[0146] The purified second return air S2 that has passed through the filter 231B flows into the supply air duct 83 via the other end of the inlet duct 86 by the fan 233B, and is mixed with a mixture of the cooled and dehumidified first return air S1 and outside air S3 sent from the air conditioner 2.

[0147] As described above, the replacement air conditioning system 100 of this embodiment also performs a purification process on the room temperature second return air S2 that is mixed with the mixed air of the first return air S1 and the outside air S3, so that it is possible to deal with contaminants in the return air and maintain the cleanliness of the conditioned air.

[0148] In the displacement air conditioning system 100 of this embodiment, a mixture of first return air S1 that has been subjected to cooling and dehumidification processing and outside air S3 flows into the intake air duct 83, and near the other end of the inlet duct 86, the mixture is heated by the second return air S2 that has been subjected to purification processing and is hotter than the occupied area. Therefore, the conditioned air obtained by mixing the first return air S1, the second return air S2, and the outside air S3 becomes hotter than the mixture of the first return air S1 that has been subjected to cooling and dehumidification processing and the outside air S3. Therefore, dehumidification processing by supercooling can be performed without consuming reheating energy while reducing the temperature difference between the conditioned air blown into the room 1 and the occupied area.

[0149] Furthermore, in the replacement air conditioning system 100 of this embodiment, as described above, the division, mixing and cooling of the first return air S1 and the second return air S2 are performed outdoors. Therefore, people in the room 1 do not feel uncomfortable due to noise such as operating sounds.

[0150] As described above, in the replacement air conditioning system 100 of this embodiment, the return air in the attic space 14 is divided into the first return air S1 and the second return air S2 before it flows into the return air duct 82, and only the first return air S1 is sent to the casing 2, while the second return air S2 flows into the supply air duct 83 via the inlet duct 86. Therefore, there is no need to transport the first return air S1 and the second return air S2 to the air conditioner 2, and only the first return air S1 is sent to the casing 2. This makes it possible to reduce the power required to transport the return air.

[0151] The same parts as those in the first embodiment are given the same reference numerals and detailed explanations are omitted.

[0152] (Embodiment 8) FIG. 9 is a schematic diagram of a replacement air conditioning system 100 according to the eighth embodiment. Similar to embodiment 1, the replacement air conditioning system 100 according to embodiment 8 is a system that performs replacement air conditioning by supplying fresh conditioned air into a room 1 and discharging indoor air with a high concentration of pollutants, and includes an air conditioner 2, an air outlet 3, an air intake 4, an indoor temperature and humidity sensor 5, a supply air temperature and humidity sensor 6, and a control device 7. In Fig. 9, the indoor temperature and humidity sensor 5, the supply air temperature and humidity sensor 6, and the control device 7 are not shown.

[0153] The air conditioner 2 performs air conditioning such as heating and cooling in a room using a displacement air conditioning method. The air conditioner 2 includes a casing 21, a clean temperature adjustment unit 23, a fan 233, and the like housed in the casing 21. The casing 21 is provided on the outside of the living room 1 (side wall 12). An outside air duct 81, a return air duct 82, and a supply air duct 83 are connected to the casing 21, and an air path (not shown) is formed inside the casing 21.

[0154] The configurations and operations of the casing 21 and the clean temperature adjustment section 23, as well as the configurations and operations of the outside air duct 81, the return air duct 82 and the supply air duct 83 are similar to those of the embodiments 5-7, and therefore detailed explanations will be omitted.

[0155] Additionally, a plurality of air outlets 3 and a plurality of air inlets 4 are provided on the ceiling 11 of the living room 1. The air outlets 3 blow out the conditioned air transported via the air supply duct 83 downward from the ceiling 11 of the living room 1. The air inlets 4 draw indoor air containing pollutants into the attic 14. The configurations of the air outlets 3 and air inlets 4 are similar to those of the embodiments 5-7, and detailed explanations will be omitted.

[0156] In the replacement air conditioning system 100 according to the eighth embodiment, a plurality of inflow ducts 86 into which air in the attic space 14 flows are provided in the supply air duct 83. For example, the number of inflow ducts 86 is the same as the number of air outlets 3, and an inflow duct 86 is provided for each air outlet 3. One end of each inflow duct 86 opens to the attic space 14, and the other end communicates with the cylinder 31 of the air outlet 3. The air in the attic space 14 sucked in from the inflow duct 86 is mixed with air passing through the supply air duct 83, and is blown out from the air outlet 3 into the living room 1.

[0157] Each inflow duct 86 has, for example, a cylindrical shape, and a filter 231B (cleaning section) and a fan 233B are disposed in each inflow duct 86. The filter 231B is disposed near the one end of the inflow duct 86, and the fan 233B is disposed near the other end of the inflow duct 86.

[0158] A portion of the air (return air) in the attic space 14 flows into the inlet duct 86, and the other portion flows into the air conditioner 2 via the return air duct 82. That is, the air in the attic space 14 is divided into second return air S2 that flows into the inlet duct 86, and first return air S1 that flows into the return air duct 82. In other words, the return air duct 82 is a first air path through which the first return air S1 flows, and the inlet duct 86 is a second air path through which the second return air S2 flows.

[0159] The second return air S2 that has flowed into each inlet duct 86 is directed by the fan 233B to the filter 231B, where it is subjected to a purification process. As in the first embodiment, the filter 231B is subjected to a purification process by a different means than the filter 231A. Furthermore, by distinguishing between the purification processes for air that includes outside air and air that does not include outside air, it is possible to appropriately maintain and manage the purification device.

[0160] The purified second return air S2 that has passed through each filter 231B flows into the supply air duct 83 through the other end of the inlet duct 86 by the fan 233B, and is mixed with a mixture of cooled and dehumidified first return air S1 and outside air S3 sent from the air conditioner 2.

[0161] As described above, the replacement air conditioning system 100 of this embodiment also performs a purification process on the room temperature second return air S2 that is mixed with the mixed air of the first return air S1 and the outside air S3, so that it is possible to deal with contaminants in the return air and maintain the cleanliness of the conditioned air.

[0162] In the displacement air conditioning system 100 of this embodiment, a mixture of the first return air S1 that has been subjected to cooling and dehumidification processing and the outside air S3 flows into the supply air duct 83, and near the other end of each inlet duct 86, the second return air S2 that has been subjected to purification processing and is hotter than the occupied area is mixed and heated. Therefore, the conditioned air obtained by mixing the first return air S1, the second return air S2, and the outside air S3 becomes hotter than the mixed air of the first return air S1 that has been subjected to cooling and dehumidification processing and the outside air S3. Therefore, it is possible to perform dehumidification processing by supercooling without consuming reheating energy, while reducing the temperature difference between the conditioned air blown into the room 1 and the occupied area.

[0163] As described above, in the replacement air conditioning system 100 of this embodiment, only the first return air S1 is sent to the casing 2, and the second return air S2 flows into the supply air duct 83 via the inlet duct 86. Therefore, compared to the case where the first return air S1 and the second return air S2 are transported to the air conditioner 2, the power required to transport the return air can be reduced. Furthermore, the fan 233B and the filter 231B can be inspected and repaired for each air outlet 3, allowing for appropriate maintenance and management.

[0164] The same parts as those in the first embodiment are given the same reference numerals and detailed explanations are omitted.

[0165] In the first to eighth embodiments, the purification process for the second return air S2 is performed above the living room 1 (attic 14) or in a room adjacent to the living room 1, but this is not limited to the above. For example, the purification process for the second return air S2 may be performed in a common area adjacent to the living room 1, such as a hallway.

[0166] The present invention is not limited to these examples, but is intended to include all modifications within the scope of the claims and their equivalent meanings. In addition, at least a portion of each of the above-described embodiments may be arbitrarily combined. The sequences shown in each embodiment are not limited, and the order of each process may be changed and multiple processes may be executed in parallel, as long as there is no contradiction. The subject of each process is not limited, and the process of each device may be executed by another device, as long as there is no contradiction.

[0167] The matters described in each embodiment can be combined with each other. In addition, the independent claims and dependent claims described in the claims can be combined with each other in any and all combinations regardless of the citation format. Furthermore, the claims use a format in which a claim cites two or more other claims (multiple claim format), but this is not limited to this. A multiple claim (multi-multi claim) that cites at least one multiple claim may also be used. [Explanation of symbols]

[0168] 1 living room 2 Air conditioner 3 Air outlet 4 Intake port 5. Indoor temperature and humidity sensor 6 Supply temperature and humidity sensor 7 Control device 11. Ceiling 12 Side wall 13 Beds 21 Casing 23 Cleaning temperature control section 31 Cylinder 32 Lower end opening 71 Control Unit 100 Displacement Air Conditioning System 221 Motor Damper 231,231A Filter 231B Filter (cleaning part) 232 Cooling coil 233, 233A, 233B Fan S1 First return air S2 Second return air S3 Fresh air

Claims

1. A displacement air conditioning system that exhausts indoor air from above the room, A first air passage through which first return air, which is a part of the exhausted indoor air, flows; a second air passage through which second return air, which is the exhausted indoor air excluding the first return air, flows; A cleaning temperature control unit that performs cooling and cleaning processes on the first return air; A purification section which performs a purification process on the second return air; an air outlet that supplies conditioned air obtained by mixing the first return air and the second return air to a lower portion of the room; A displacement air conditioning system comprising:

2. The replacement air conditioning system according to claim 1 , wherein the conditioned air is supplied to a lower part of the room by blowing the conditioned air downward from an upper part of the room toward a floor.

3. 3. The replacement air conditioning system according to claim 1, wherein the conditioned air is blown out at a temperature of 15°C to 26°C and at a relative humidity of 80% or less.

4. 3. The replacement air conditioning system according to claim 1, wherein the cooling and purification processes for the first return air and the purification process for the second return air are performed within the same housing.

5. The replacement air conditioning system according to claim 1 or 2, wherein the second return air is purified in an upper portion of the room, in a room adjacent to the room, or in a common area adjacent to the room.

6. The displacement air-conditioning system according to claim 1 or 2, wherein the cooling process and the cleaning process are carried out after mixing the first return air with outside air.

7. 3. The displacement air-conditioning system according to claim 1, wherein the cleaning treatment comprises filter collection, ultraviolet irradiation, streamer discharge or electric dust collection.

8. 3. The displacement air conditioning system according to claim 1, wherein the purification treatment is carried out prior to the mixing of the first return air and the second return air.

9. 3. The displacement air conditioning system according to claim 1, wherein the purification process is carried out after the mixing of the first return air and the second return air.

10. The replacement air conditioning system according to claim 1 or 2, wherein the purification process for the first return air and the purification process for the second return air are performed by different treatment means.

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