Air conditioning system

Abstract

The invention provides an air conditioning system which is low in cost and simple in structure. An air conditioning system (10) is provided with: a ventilation unit (1) that has an exhaust fan (13) and an air suction port (11a) and sucks air through the air suction port (11a) as the exhaust fan (13) is driven; a suction duct (4); a plurality of suction-side dampers (51, 52, 53,..., 5n); a carbon dioxide concentration sensor (2); and a control device that opens the suction-side damper corresponding to the room to be detected of the carbon dioxide concentration among the plurality of suction-side dampers, closes the remaining suction-side dampers, and drives the exhaust fan. The carbon dioxide concentration sensor is provided in a confluence pipe (4b) of the suction duct, a flow path through which air inside the ventilation unit flows on the downstream side of the confluence pipe, or an exhaust duct (6) through which air flows on the downstream side of the ventilation unit.

Description

Technical Field

[0001] The present disclosure relates to an air conditioning system. Background Art

[0002] In recent years, with the spread of infections such as the novel coronavirus, it has been recommended to maintain good indoor air quality (IAQ: Indoor Air Quality) in rooms. For example, as a technique for maintaining good indoor air quality by performing room ventilation, the technique described in Patent Document 1 is known.

[0003] That is, Patent Document 1 describes "a ventilation control device including: a level setting unit that sets a level based on at least one of an environment of a control target space and energy consumption; and an outside air amount control unit that controls a proportion of outside air contained in the air supply to the control target space generated by an air conditioner based on the level set by the level setting unit".

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2022-085774 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] In the technique described in Patent Document 1, when detecting the carbon dioxide concentration in a predetermined room, a CO2 sensor is provided in the room. Then, when individually detecting the carbon dioxide concentration in each of a plurality of rooms, CO2 sensors are provided in the plurality of rooms respectively, which leads to an increase in cost and complication of the system.

[0009] Therefore, the subject of the present disclosure is to provide an air conditioning system with low cost and simple structure.

[0010] Means for Solving the Problems

[0011] In order to solve the above problems, the air conditioning system of the present disclosure includes: an air conditioning unit having a first fan and an air suction port, which sucks air through the air suction port along with the driving of the first fan; a first duct that connects the air suction port to multiple rooms respectively; a plurality of first air dampers provided in the first duct corresponding to the multiple rooms respectively; a sensor that detects a predetermined index of the indoor air quality in at least a part of the multiple rooms; and a control unit that, when the predetermined index is detected by the sensor, makes the first air damper corresponding to the room that is the detection object of the predetermined index among the multiple first air dampers in an open state, makes the remaining first air dampers in a closed state, and drives the first fan. The sensor is provided in a confluence pipe of the first duct, a flow path that circulates the air inside the air conditioning unit on the downstream side of the confluence pipe, or an exhaust duct that circulates air on the downstream side of the air conditioning unit.

[0012] Advantages of the Invention

[0013] According to the present disclosure, an air conditioning system with low cost and simple structure can be provided. Description of the Drawings

[0014] Figure 1 It is a structural diagram of the air conditioning system of the embodiment.

[0015] Figure 2 It is a schematic cross-sectional view of the ventilation unit of the air conditioning system of the embodiment.

[0016] Figure 3 It is a functional block diagram of the air conditioning system of the embodiment.

[0017] Figure 4 It is a flowchart of the process executed by the control device regarding the detection of the carbon dioxide concentration in each room in the air conditioning system of the embodiment.

[0018] Figure 5 It is an explanatory diagram showing the states of the respective suction-side air dampers when detecting the carbon dioxide concentration in the air conditioning system of the embodiment.

[0019] Figure 6 It is an explanatory diagram showing the situation of detecting the carbon dioxide concentration in room R1 in the air conditioning system of the embodiment.

[0020] Figure 7 It is a structural diagram of the air conditioning system of the first modification.

[0021] Figure 8 It is a structural diagram of the air conditioning system of the second modification.

[0022] Figure 9It is a structural diagram of the air conditioning system of the third modified example.

[0023] In the figure:

[0024] 1, 1C - Ventilation unit (air conditioning unit), 2 - Carbon dioxide concentration sensor (sensor), 3 - Control device (control section), 4 - Suction duct (first duct), 4a - Branch duct, 4b - Confluence duct, 6 - Exhaust duct, 7 - External air duct, 8 - Supply duct (second duct), 10, 10A, 10B, 10C - Air conditioning systems, 11 - Housing, 11a - Air intake, 11b - Exhaust port, 11c - External air intake, 11d - Supply port, 12 - Total heat exchanger, 13 - Exhaust fan (first fan), 14 - Supply fan (second fan), 15a, 15b - Areas (flow paths), 51, 52, 53,..., 5n - Suction side baffles (first baffles), 91, 92, 93,..., 9n - Supply side baffles (second baffles), R1, R2, R3,..., Rn - Rooms. Detailed implementation manners

[0025] 《Implementation manners》

[0026] <Structure of the air conditioning system>

[0027] Figure 1 It is a structural diagram of the air conditioning system 10 of the implementation manner.

[0028] Figure 1 The shown air conditioning system 10 is a system for ventilating a plurality of rooms R1, R2, R3, ···, Rn. In addition, as an equipment including a plurality of rooms R1, R2, R3,..., Rn, for example, in addition to office buildings, residences (including single-family houses, apartment buildings), factories, warehouses, commercial facilities, complex facilities, accommodation facilities can also be cited as such equipment. In Figure 1 the example, the plurality of rooms R1, R2, R3, ···, Rn are arranged in an adjacent manner in sequence, but it is not particularly necessary for these rooms R1, R2, R3, ···, Rn to be adjacent in sequence. In addition, the ventilation of the rooms is also included in "air conditioning".

[0029] As Figure 1 shown, the air conditioning system 10 includes a ventilation unit 1 (air conditioning unit), a carbon dioxide concentration sensor 2 (sensor), and a control device 3 (control section: refer to Figure 3)。In addition, the air conditioning system 10 includes an intake duct 4 (first duct), intake side dampers 51, 52, 53, ..., 5n (first dampers), and an exhaust duct 6 as structures related to the exhaust from rooms R1, R2, R3, ..., Rn. Moreover, the air conditioning system 10 includes an outside air duct 7, a supply duct 8 (second duct), and supply side dampers 91, 92, 93, ..., 9n (second dampers) as structures related to the supply of air to rooms R1, R2, R3, ..., Rn.

[0030] The ventilation unit 1 is a device for ventilating rooms R1, R2, R3, ···, Rn. That is, the ventilation unit 1 discharges the air from rooms R1, R2, R3, ···, Rn to the outside, and supplies fresh air (outside air) from the outside to rooms R1, R2, R3, ···, Rn. In addition, the ventilation unit 1 also has a function of performing heat exchange between the air from rooms R1, R2, R3, ..., Rn and the fresh air from the outside. Such a ventilation unit 1 is provided, for example, in a space on the back of the ceiling of a device (not shown) including rooms R1, R2, R3, ..., Rn, or a mechanical room (not shown).

[0031] The carbon dioxide concentration sensor 2 is a sensor for sequentially detecting the carbon dioxide concentration (a predetermined index of indoor air quality) in rooms R1, R2, R3, …, Rn. In Figure 1 the example, the carbon dioxide concentration sensor 2 is provided inside the ventilation unit 1. In addition, the carbon dioxide concentration in each of rooms R1, R2, R3, ..., Rn mostly becomes different values depending not only on the volume of the room but also on the number of indoor occupants and the amount of activity. For example, even when the volumes of rooms R1 and R2 are equal, if the number of indoor occupants and the amount of activity in another room R2 are more than those in room R1, the amount of carbon dioxide generated from the human body increases, so the carbon dioxide concentration in room R2 becomes relatively higher.

[0032] The intake duct 4 (first duct) is a duct that connects the air intake port 11a of the ventilation unit 1 and the plurality of rooms R1, R2, R3, ..., Rn respectively. As Figure 1 shown, the intake duct 4 is configured to include a branch duct 4a and a confluence duct 4b. The branch duct 4a is a duct that guides the air from rooms R1, R2, R3, ···, Rn to the confluence duct 4b respectively. The confluence duct 4b is a duct that causes the air guided from rooms R1, R2, R3, ..., Rn via the branch duct 4a to converge. As Figure 1 shown, the downstream end of the confluence duct 4b is inserted into the air intake port 11a of the ventilation unit 1.

[0033] Figure 1The suction side damper 51 shown in FIG. 1 has a function of adjusting the flow rate of air when exhausting air from the room R1. Figure 2 ) is driven at a predetermined rotation speed, the larger the opening of the suction side damper 51 is, the larger the exhaust volume per unit time from the room R1 becomes. The same is true for the remaining suction side dampers 52, 53, ..., 5n. As such suction side dampers 51, 52, 53, ..., 5n, for example, a VAV (Variable Air Volume System) damper is used.

[0034] like Figure 1 As shown, a plurality of suction side windshields 51, 52, 53, ..., 5n (first windshields) are arranged in the suction duct 4 (first duct) in a manner corresponding to the plurality of rooms R1, R2, R3, ..., Rn, respectively. For example, the suction side windshield 51 is arranged in the suction duct 4 in a manner corresponding to the room R1. Similarly, the remaining suction side windshields 52, 53, ..., 5n also correspond to the rooms R2, R3, ..., Rn in this order. In addition, the plurality of suction side windshields 51, 52, 53, ..., 5n also have the function of switching the connection or disconnection between the ventilation unit 1 and each of the plurality of rooms R1, R2, R3, ..., Rn.

[0035] For example, when the exhaust fan 13 is driven in a state where the suction side dampers 51, 52, 53, ..., 5n are opened as predetermined (see Figure 2 ), the air in each of the rooms R1, R2, R3, ..., Rn is guided to the air inlet 11a of the ventilation unit 1 via the intake duct 4. The air guided to the air inlet 11a undergoes heat exchange in the total heat exchanger 12, and the air after the heat exchange is discharged in sequence via the exhaust port 11b and the exhaust duct 6. The exhaust duct 6 is a duct for discharging the air that has undergone heat exchange in the total heat exchanger 12, and is inserted into the exhaust port 11b of the ventilation unit 1.

[0036] Figure 1 The external air duct 7 shown is a duct that guides fresh external air to the external air intake port 11c of the ventilation unit 1, and is inserted into the external air intake port 11c. The air supply duct 8 (second duct) is a duct that connects the air supply port 11d of the ventilation unit 1 (air conditioning unit) and the multiple rooms R1, R2, R3, ..., Rn respectively. The air supply duct 8 is composed of a mainstream duct 8a and a branch duct 8b. The mainstream duct 8a is a duct for the air that flows out of the air supply port 11d of the ventilation unit 1. Figure 1 As shown, the upstream end of the main flow duct 8a is inserted into the air supply port 11d of the ventilation unit 1. The branch duct 8b is a duct that guides the air flowing through the main flow duct 8a to each of the rooms R1, R2, R3, ..., Rn.

[0037] Figure 1 The shown air supply side damper 91 has the function of adjusting the air volume when supplying air from the ventilation unit 1 to the room R1. That is, when the air supply fan 14 (refer to Figure 2 ) is driven at a predetermined rotational speed, the larger the opening degree of the air supply side damper 91, the larger the air volume of the air supplied from the ventilation unit 1 to the room R1. In addition, the same applies to the remaining air supply side dampers 92, 93,..., 9n. As such air supply side dampers 91, 92, 93,..., 9n, for example, VAV (Variable Air Volume System) dampers are used.

[0038] As Figure 1 shown, a plurality of suction side dampers 51, 52, 53,..., 5n (second dampers) are provided in the air supply duct 8 (second duct) corresponding to the plurality of rooms R1, R2, R3,..., Rn respectively. For example, the air supply side damper 91 is provided in the air supply duct 8 corresponding to the room R1. Similarly, the remaining air supply side dampers 92, 93,..., 9n also correspond to the rooms R2, R3,..., Rn in sequence. In addition, the plurality of air supply side dampers 91, 92, 93,..., 9n also have the function of switching the connection or disconnection between the ventilation unit 1 and each of the plurality of rooms R1, R2, R3,..., Rn.

[0039] Figure 2 is a schematic cross-sectional view of the ventilation unit 1.

[0040] In addition, Figure 2 the shown hollow arrows indicate the direction of air flow. As Figure 2 shown, the ventilation unit 1 (air conditioning unit) includes a housing 11, a total heat exchanger 12, an exhaust fan 13 (first fan), and an air supply fan 14 (second fan).

[0041] The housing 11 is an outer shell that houses the total heat exchanger 12, the exhaust fan 13, and the air supply fan 14. The housing 11 has an air suction port 11a connected to the suction duct 4 (refer to Figure 1 ), and has an exhaust port 11b connected to the exhaust duct 6 (refer to Figure 1 ). In addition, the housing 11 has an outside air intake port 11c connected to the outside air duct 7 (refer to Figure 1 ), and has an air supply port 11d connected to the air supply duct 8 (refer to Figure 1 ).

[0042] The total heat exchanger 12 is for exchanging heat between fresh air from the outside and air from the rooms R1, R2, R3, ···, Rn (refer to Figure 1A heat exchanger that performs heat exchange (sensible heat and latent heat exchange) between the air. Figure 2 In the example of, the total heat exchanger 12 is in the shape of a quadrangular prism and is arranged to divide the internal space of the housing 11 into four regions 15a, 15b, 15c, and 15d. Figure 2 The region 15a shown is a space for guiding the air flowing in through the air inlet 11a to the total heat exchanger 12. Another region 15b is a space for guiding the air that has undergone heat exchange in the total heat exchanger 12 to the exhaust port 11b. In addition, the region 15c is a space for guiding fresh air from the outside to the total heat exchanger 12 through the outside air intake 11c. Another region 15d is a space for guiding the air that has undergone heat exchange in the total heat exchanger 12 to the air supply port 11d.

[0043] In Figure 2 In the example of, a carbon dioxide concentration sensor 2 is provided in the region 15a of the housing 11. That is, the carbon dioxide concentration sensor 2 (sensor) is provided in the suction pipe 4 (first pipe: refer to Figure 1 ) at the downstream side of the confluence pipe 4b (refer to Figure 1 ) through which the air flowing inside the ventilation unit 1 (air conditioning unit) circulates. In addition, the internal space of the cylinder forming the air inlet 11a is also included in the above-mentioned "flow path".

[0044] Figure 2 The exhaust fan 13 (first fan) shown is a fan that is driven when exhausting air from the rooms R1, R2, R3,..., Rn (refer to Figure 1 ) and is provided in the region 15b of the ventilation unit 1. And with the driving of the exhaust fan 13, air is inhaled into the ventilation unit 1 (air conditioning unit) through the air inlet 11a. More specifically, the air from the rooms R1, R2, R3,..., Rn (refer to Figure 1 ) is sequentially guided to the total heat exchanger 12 through the suction pipe 4 (refer to Figure 1 ) and the air inlet 11a. The air that has undergone heat exchange in the total heat exchanger 12 is sequentially discharged to the outside through the exhaust port 11b and the exhaust pipe 6 (refer to Figure 1 ).

[0045] Figure 2 The air supply fan 14 (second fan) shown is a fan that is driven when supplying air to the rooms R1, R2, R3,..., Rn (refer to Figure 1 ) and is provided in the region 15d of the ventilation unit 1. By driving the air supply fan 14, fresh air outside the house is sequentially passed through the outside air pipe 7 (refer to Figure 1) and the outside air intake port 11c are guided to the total heat exchanger 12. The air that has undergone heat exchange in the total heat exchanger 12 is directed to the air supply duct 8 (refer to Figure 1 Then, the air flowing through the air supply duct 8 is supplied to each room R1, R2, R3, ..., Rn (refer to Figure 1 ).

[0046] In driving of the ventilation unit 1 , normally, the exhaust fan 13 and the air supply fan 14 have substantially the same rotation speed. However, depending on the operation mode, the exhaust fan 13 and the air supply fan 14 may be driven at different rotation speeds.

[0047] Figure 3 1 is a functional block diagram of the air conditioning system 10 .

[0048] Although not shown in the picture, Figure 3 The control device 3 shown in the figure is composed of circuits such as a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and various interfaces. The CPU reads the program stored in the ROM and expands it in the RAM to perform various processes. In addition, the control device 3 can be built into the ventilation unit 1 (see Figure 2 ), and in addition, it can also be set outside the ventilation unit 1.

[0049] In addition to the predetermined operation signal input from the remote controller Re, the control device 3 also receives the detection value of the carbon dioxide concentration sensor 2 at all times. In addition, sensors other than the carbon dioxide concentration sensor 2 may be appropriately added. Based on the operation signal from the remote controller Re and the detection value of the carbon dioxide concentration sensor 2, the control device 3 controls the exhaust fan 13 and the air supply fan 14 in a predetermined manner, and also controls the suction side dampers 51, 52, 53, ..., 5n, and the air supply side dampers 91, 92, 93, ..., 9n in a predetermined manner. Specifically, during the ventilation operation, the higher the detection value of the carbon dioxide concentration in the room R1, the larger the opening of the suction side damper 51 and the air supply side damper 91 by the control device 3. Thus, the ventilation of the room R1 is promoted. The same is true for the ventilation of the remaining rooms R2, R3, ..., Rn.

[0050] <Handling of air conditioning system>

[0051] Figure 4 This is a flowchart of the process performed by the control device regarding the detection of the carbon dioxide concentration in each room (see also Figure 1 ).

[0052] also, Figure 4The series of processes shown can be performed before the start of the ventilation operation of the ventilation unit 1 or during the execution of the ventilation operation. In addition, in the following examples, the case of detecting the carbon dioxide concentration in each of the rooms R1, R2, R3, …, Rn is described, but it is also possible to detect the carbon dioxide concentration in a part of the rooms R1, R2, R3, …, Rn (for example, rooms R1, R2, R3).

[0053] In step S101, the control device 3 drives the exhaust fan 13 (refer to Figure 2 ).

[0054] In addition, in Figure 4 , the control of the supply fan 14 is not shown, but it can be performed as follows. That is, when the control device 3 (control unit) detects the carbon dioxide concentration (a predetermined index of indoor air quality) using the carbon dioxide concentration sensor 2 (sensor), the supply fan 14 (second fan) can be maintained in a stopped state, and in addition, the supply fan 14 can be driven, which can be arbitrary.

[0055] When the control device 3 maintains the supply fan 14 in a stopped state, regardless of the open / closed states of the supply side louvers 91, 92, 93, ... 9n, almost no air is supplied to the rooms R1, R2, R3, ... Rn. Therefore, in this case, each of the supply side louvers 91, 92, 93, ··· 9n can be in an open state, and in addition, can be in a closed state, which can be arbitrary. In addition, the case of driving the supply fan 14 in the detection of the carbon dioxide concentration in a predetermined room will be described later.

[0056] Next, in step S102, the control device 3 sets k = 1. Here, "k" is a value that increases when the control device 3 switches the room to be the detection object of the carbon dioxide concentration (S106).

[0057] In step S103, the control device 3 sets the suction side louver corresponding to the room Rk to the open state and sets the remaining suction side louvers to the closed state. For example, when k = 1, the control device 3 sets the suction side louver 51 corresponding to the room R1 to the open state and sets the remaining suction side louvers 52, 53, ···, 5n to the closed state.

[0058] When the exhaust fan 13 is driven in such a state (refer to Figure 2)When this occurs, the air in room R1 is guided to the ventilation unit 1 through the intake duct 4. On the other hand, regarding the remaining rooms R2, R3, ..., Rn, since the intake side windshields 52, 53, ..., 5n are in the closed state, almost no such air is guided to the ventilation unit 1. Therefore, the carbon dioxide concentration in room R1 can be detected by the carbon dioxide concentration sensor 2 provided in the ventilation unit 1.

[0059] In this way, when the control device 3 (control unit) detects the carbon dioxide concentration (a predetermined index of indoor air quality) in a predetermined room using the carbon dioxide concentration sensor 2, the intake side windshield corresponding to the room that becomes the detection target of the carbon dioxide concentration among the plurality of intake side windshields 51, 52, 53, … 5n (first windshields) is set to the open state, the remaining intake side windshields are set to the closed state, and the exhaust fan 13 (first fan) is driven. As a result, the carbon dioxide concentration in each of the rooms R1, R2, …, Rn can be detected using one carbon dioxide concentration sensor 2, so that cost reduction and structural simplification can be achieved.

[0060] In step S104, the control device 3 detects the carbon dioxide concentration in room Rk. That is, the control device 3 stores the detection value of the carbon dioxide concentration sensor 2 as the carbon dioxide concentration in room Rk. For example, the control device 3 stores the detection value of the carbon dioxide concentration sensor 2 when the intake side windshield 51 is in the open state and the remaining intake side windshields 52, 53, …, 5n are in the closed state as the detection value of the carbon dioxide concentration in room R1.

[0061] In step S105, the control device 3 determines whether the value of k is equal to n. Here, "n" is a value representing the number of rooms R1, R2, R3, ···, Rn that become the detection targets of the carbon dioxide concentration. When the value of k is not equal to n in step S105 (S105: No), the process of the control device 3 proceeds to step S106. That is, when there is a room in which the carbon dioxide concentration has not been detected, the process of the control device 3 proceeds to step S106.

[0062] In step S106, the control device 3 increments the value of k. After the process of step S106 is performed, the process of the control device 3 returns to step S103. In this way, the control device 3 sequentially switches the rooms to be the detection objects of the carbon dioxide concentration. For example, when switching the room to be the detection object of the carbon dioxide concentration from room R1 to room R2, the control device 3 switches the intake side damper 51 corresponding to room R1 from the open state to the closed state. On the other hand, the other intake side damper 52 corresponding to room R2 is switched from the closed state to the open state. In addition, the control device 3 maintains the intake side dampers 53, ···, 5n corresponding to the remaining rooms R3, ···, Rn in the closed state. Thereby, the air in room R2 is guided to the ventilation unit 1 via the intake duct 4.

[0063] In addition, when the value of k is equal to n in step S105 (S105: Yes), the process of the control device 3 proceeds to step S107. That is, when the carbon dioxide concentrations of rooms R1, R2, R3, ···, Rn have been detected, the process of the control device 3 proceeds to step S107.

[0064] In step S107, the control device 3 determines whether a predetermined time has elapsed. That is, the control device 3 determines whether a predetermined time has elapsed since the detection of the carbon dioxide concentrations of rooms R1, R2, R3, ···, Rn was completed. The above-mentioned predetermined time is the cycle (for example, 1 hour) during the series of processes shown, and is preset. When the predetermined time has not elapsed in step S107 (S107: No), the control device 3 repeats the process of step S107. In addition, when the predetermined time has elapsed in step S107 (S107: Yes), the process of the control device 3 returns to "START" (RETURN). Figure 4

[0065] Figure 4 In addition, in Figure 2 the flowchart, it is illustrated that when sequentially detecting the carbon dioxide concentrations of rooms R1, R2, R3, ···, Rn, the control device 3 continuously drives the exhaust fan 13 (refer to ), but it is not limited thereto. For example, when switching the open / closed state of at least one of the intake side dampers 51, 52, 53, ···, 5n, the control device 3 may temporarily stop the exhaust fan 13. After switching the open / closed state of at least one of the intake side dampers 51, 52, 53, ···, 5n, the control device 3 drives the exhaust fan 13 again. Thereby, it is possible to suppress applying a large load to the intake side dampers 51, 52, 53, ···, 5n during the switching of the open / closed state.

[0066] Figure 5 ​It is an explanatory diagram showing the states of the respective intake side windshields when detecting the carbon dioxide concentration (also refer to Figure 1 ) appropriately.

[0067] In addition, Figure 5 each column of indicates the open / close states of the intake side windshields 51, 52, 53,..., 5n when detecting the carbon dioxide concentration (conducting CO2 detection) in a predetermined room (for example, room R1). Additionally, Figure 5 "Open" indicated by the thick frame line of means that the predetermined intake side windshield is in an open state. Here, the "open" state of the intake windshield does not necessarily need to be fully open, as long as air can flow through the intake side windshield. Additionally, Figure 5 "Closed" indicated by means that the predetermined intake side windshield is in a closed state.

[0068] In Figure 5 , "the intake side windshield of room R1" refers to the intake side windshield 51 corresponding to room R1. Similarly, for the intake side windshields of the remaining rooms R2, R3,..., Rn. For example, when detecting the carbon dioxide concentration in room R1, the control device 3 makes the intake side windshield 51 of room R1 in an open state and makes the intake side windshields 52, 53,..., 5n of the remaining rooms R2, R3,..., Rn in a closed state. Thus, the carbon dioxide concentration in room R1 can be detected by the carbon dioxide concentration sensor 2 provided in the ventilation unit 1. Similarly, the control device 3 sequentially switches the rooms to be the detection targets of the carbon dioxide concentration for rooms R1, R2, R3, ···, Rn.

[0069] Figure 6 It is an explanatory diagram when detecting the carbon dioxide concentration in room R1.

[0070] In addition, in the above-mentioned flowchart (refer to Figure 4 ), the case where the supply air fan 14 is in a stopped state during the detection of the carbon dioxide concentration is described, but the subsequent processing can also be performed. For example, when detecting the carbon dioxide concentration in room R1, the control device 3 can also drive the exhaust fan 13 (refer to Figure 2 ) and drive the supply air fan 14 (refer to Figure 2 ). More specifically, when the control device 3 (control unit) detects the carbon dioxide concentration (a predetermined index of indoor air quality) using the carbon dioxide concentration sensor 2 (sensor), it closes the supply air side windshield 91 corresponding to the room R1 that becomes the detection target of the carbon dioxide concentration among the multiple supply air side windshields 91, 92, 93,..., 9n (second windshields) and drives the supply air fan 14 (second fan: refer to Figure 2 ).

[0071] Accordingly, when detecting the carbon dioxide concentration in room R1, it is possible to prevent air from flowing into room R1 through the air supply pipe 8. Therefore, the actual carbon dioxide concentration in room R1 will not gradually decrease during the detection of the carbon dioxide concentration, and thus the carbon dioxide concentration can be detected with high precision.

[0072] In addition, in the Figure 6 example, the air supply side windshields 92, 93, …, 9n of rooms R2, R3, …, Rn that are not the detection targets of the carbon dioxide concentration are all in the open state, but this is not limited thereto. For example, during the detection of the carbon dioxide concentration in room R1, a part of the air supply side windshields 92, 93, …, 9n can be in the closed state and the rest in the open state. In short, as long as no new outside air is supplied to room R1 when detecting the carbon dioxide concentration in room R1.

[0073] In addition, the control device 3 (control unit) can also repeatedly detect the carbon dioxide concentration (predetermined index) during the "period" when the respective open or closed states of the plurality of suction side windshields 51, 52, 53, …, 5n (first windshields) are maintained. In this case, compared with the first half of the above "period", the control device 3 can increase the weighting of the detection value of the carbon dioxide concentration (predetermined index) in the second half of this "period". For example, the period when the suction side windshield 51 is in the open state and the remaining suction side windshields 52, 53, …, 5n are in the closed state is set to 1 minute, and the detection value per second is obtained (60 detection values are obtained for room R1). In this case, compared with the detection value of the carbon dioxide concentration obtained during the first half of 30 seconds, the control device 3 increases the weighting of the detection value of the carbon dioxide concentration obtained during the second half of 30 seconds. As the above "weighting", a predetermined weighting coefficient multiplied by the detection value of the carbon dioxide concentration can also be used.

[0074] For example, when detecting the carbon dioxide concentration in room R2 after detecting the carbon dioxide concentration in room R1, immediately after switching the states of the suction side windshields 51, 52, 53, …, 5n, the air in room R1 remains in the suction pipe 4. Then, the air remaining in the suction pipe 4 (the air in room R1) is discharged to the outside by the driving of the exhaust fan 13. Therefore, by increasing the weighting of the detection value in the second half compared with the first half of the above "period", the carbon dioxide concentration in room R2 can be detected with high precision.

[0075] In addition, when the "period" during which the side windshields 51, 52, 53, ..., 5n are continuously in the open state or the closed state is 1 minute, instead of using the detection values of the carbon dioxide concentration in the first half of 30 seconds (a total of 30 detection values per second), the control device 3 stores the average value of the detection values of the carbon dioxide concentration in the second half of 30 seconds (a total of 30 detection values per second) as the carbon dioxide concentration of a predetermined room. Such processing is also included in the matter of increasing the weighting of the detection values of the carbon dioxide concentration in the second half compared to the first half of the above-mentioned "period".

[0076] In addition, when the "period" during which the side windshields 51, 52, 53, ..., 5n are continuously in the open state or the closed state is 1 minute, instead of using the detection values of the carbon dioxide concentration in the first half of 30 seconds, the last obtained one (or the average value of multiple detection values) among the detection values in the second half of 30 seconds (a total of 30 detection values per second) is stored as the detection value of the carbon dioxide concentration. Such processing is also included in the matter of increasing the weighting of the detection values of the carbon dioxide concentration in the second half compared to the first half of the above-mentioned "period".

[0077] According to the present embodiment, the carbon dioxide concentration sensors 2 provided in the ventilation unit 1 are used to sequentially detect the carbon dioxide concentration in each of the rooms R1, R2, R3, ..., Rn. Therefore, it is not particularly necessary to separately provide the carbon dioxide concentration sensors 2 in the rooms R1, R2, R3, ..., Rn, and the number of the carbon dioxide concentration sensors 2 can be one, so that the structure of the air conditioning system 10 can be simplified and the cost can be reduced.

[0078] 《Modification Example》

[0079] The air conditioning system 10 of the present disclosure has been described above through the embodiments, but the present disclosure is not limited to these descriptions and can be variously modified. For example, in the embodiments, the case where the carbon dioxide concentration sensors 2 are provided in the ventilation unit 1 has been described, but it is not limited thereto. That is, as will be described below, the carbon dioxide concentration sensors 2 can also be provided in the confluence pipe 4b of the suction pipe 4 (refer to Figure 7 ).

[0080] Figure 7 It is a structural diagram of the air conditioning system 10A of the first modification example.

[0081] In addition, in Figure 7In the figure, the carbon dioxide concentration sensor 2 is shown outside the confluence pipe 4b of the intake pipe 4. However, in order to detect the carbon dioxide concentration, the carbon dioxide concentration sensor 2 is actually provided inside (for example, on the inner wall surface) of the confluence pipe 4b of the intake pipe 4. Thus, even when the carbon dioxide concentration sensor 2 is provided in the confluence pipe 4b of the intake pipe 4 (the first pipe) instead of the ventilation unit 1, the same effect as in the embodiment can be achieved. In addition, the carbon dioxide concentration sensor 2 and the control device 3 (refer to Figure 3 ) can be connected via wiring, and they can also communicate wirelessly with each other.

[0082] Figure 8 It is a structural diagram of the air conditioning system 10B of the second modification.

[0083] In addition, in Figure 8 , the carbon dioxide concentration sensor 2 is shown outside the exhaust pipe 6. However, in order to detect the carbon dioxide concentration, the carbon dioxide concentration sensor 2 is actually provided inside (for example, on the inner wall surface) of the exhaust pipe 6. As Figure 8 shown, the structure in which the carbon dioxide concentration sensor 2 is provided in the exhaust pipe 6 through which air flows on the downstream side of the ventilation unit 1 (the air conditioning unit) can also achieve the same effect as in the embodiment.

[0084] Thus, the carbon dioxide concentration sensor 2 (the sensor) can also be provided in the confluence pipe 4b of the intake pipe 4 (the first pipe), in the flow path through which air inside the ventilation unit 1 (the air conditioning unit) flows on the downstream side of the confluence pipe 4b, or in the exhaust pipe 6 through which air flows on the downstream side of the ventilation unit 1 (the air conditioning unit).

[0085] Figure 9 It is a structural diagram of the air conditioning system 10C of the third modification.

[0086] Figure 9 The air conditioning system 10C shown is a structure in which the air supply pipe 8 (refer to Figure 1 ) and the air supply side windshields 91, 92, 93,..., 9n (refer to Figure 1 ) are omitted from the structure described in the embodiment. In addition, the confluence pipe 4b of the intake pipe 4 is inserted into the air intake 11a of the ventilation unit 1C, and the exhaust pipe 6 is inserted into the exhaust port 11b. Although not shown, the ventilation unit 1C is equipped with an exhaust fan.

[0087] And, along with the driving of the above-mentioned exhaust fan (not shown), the air inhaled into the ventilation unit 1C via the intake pipe 4 is discharged via the exhaust pipe 6. A carbon dioxide concentration sensor 2 is provided in the flow path through which air inside the ventilation unit 1C flows on the downstream side of the confluence pipe 4b. The control device (not shown) of the ventilation unit 1C is the same as that in the embodiment (Figure 4 , Figure 5 ) Similarly, the air damper on the suction side corresponding to the room to be detected as the target of carbon dioxide concentration is opened, the remaining air dampers on the suction side are closed, and the exhaust fan (not shown) is driven. Then, the control device sequentially switches the room to be detected as the target of carbon dioxide concentration. In such a structure, the carbon dioxide concentration of each of the rooms R1, R2, R3, ..., Rn can also be detected by one carbon dioxide concentration sensor 2.

[0088] In the embodiment, the area 15a (see Figure 2 ) is provided in the case where the carbon dioxide concentration sensor 2 is provided, but the present invention is not limited thereto. For example, the carbon dioxide concentration sensor 2 may be provided in the region 15b on the exhaust side instead of the region 15a on the intake side. The carbon dioxide concentration in the region 15b on the exhaust side is substantially equal to that in the region 15a on the intake side, and therefore, even with such a structure, the same effect as in the embodiment can be achieved. In addition, the region 15b (refer to Figure 2 ) is included in the "flow path" of the air flowing through the interior of the ventilation unit 1 (air conditioning unit) on the downstream side of the confluence pipe 4b. In addition, the internal space of the cylinder forming the exhaust port 11b is also included in the above-mentioned "flow path".

[0089] In addition, the embodiment describes a case where the control device 3 (control unit) sequentially switches all of the multiple rooms R1, R2, R3, ..., Rn to become the rooms for detecting the carbon dioxide concentration (predetermined indicator of indoor air quality), but the present invention is not limited to this. That is, the carbon dioxide concentration sensor 2 (sensor) may also be used to detect the carbon dioxide concentration (predetermined indicator of indoor air quality) of at least a part of the multiple rooms R1, R2, R3, ..., Rn. In this case, the control device 3 (control unit) sequentially switches at least a part of the multiple rooms R1, R2, R3, ..., Rn to become the rooms for detecting the carbon dioxide concentration (predetermined indicator of indoor air quality). Such processing may also have the same effect as the embodiment.

[0090] In addition, the ventilation unit 1 described in the embodiment (see Figure 1 ), a direct evaporation coil (not shown) may be provided on the downstream side of the air supply fan 14. The direct evaporation coil is a heat exchanger that performs heat exchange between the air flowing from the total heat exchanger 12 toward the air supply port 11d and the refrigerant. By providing the direct evaporation coil in this way, air whose temperature has been adjusted to a predetermined level can be supplied to the rooms R1, R2, R3, ..., Rn.

[0091] In addition, in the embodiment, the case where the air conditioning system 10 (refer to Figure 1 ) includes the ventilation unit 1 (refer to Figure 1 ) has been described, but it is not limited thereto. For example, in the air conditioning system, a heat source unit (not shown) having a compressor, an expansion valve, an outdoor fan, and an outdoor heat exchanger; and an air conditioning unit having a fan and a heat exchanger may also be provided. Such an air conditioning system is configured such that the refrigerant circulates successively through the compressor, the outdoor heat exchanger, the expansion valve, and the heat exchanger. And heat exchange is performed between the air sucked into the air conditioning unit via the suction duct and the refrigerant flowing through the heat exchanger of the air conditioning unit, and the air that has undergone heat exchange is supplied to the rooms R1, R2, R3, …, Rn via the supply ducts respectively. In addition, the control of the plurality of suction side dampers provided in the suction duct and the plurality of supply side dampers provided in the supply duct is the same as that in the embodiment, and thus the description thereof is omitted.

[0092] In addition, as the above heat source unit (not shown), a unit (so-called cooler) configured to adjust the temperature of the air returned from the air conditioning unit (not shown) by heat exchange with cold water or warm water may also be used. In addition, the embodiment can be applied to various air conditioning systems.

[0093] In addition, instead of the supply duct 8 (refer to Figure 1 ) described in the embodiment, the undercut portion of a door (not shown) provided in the partition wall between adjacent rooms may be used. In this case, air is supplied to each room successively via the undercut portion of the above door.

[0094] In addition, in the embodiment, the case where the carbon dioxide concentration sensors 2 detect the carbon dioxide concentrations in the rooms R1, R2, R3, …, Rn respectively has been described, but it is not limited thereto. For example, the "predetermined index of indoor air quality" may also be the temperature, humidity, concentration of airborne particulate matter in the air of the room to be detected, or the concentration of the refrigerant used for air conditioning. The above "airborne particulate matter" refers to, for example, air pollutants such as PM2.5. In addition, when detecting the concentration of the above refrigerant, for example, a refrigerant sensor (not shown) for detecting refrigerant leakage from the refrigerant piping of the air conditioning unit is used.

[0095] In addition, various indicators of indoor air quality can also be detected. For example, the predetermined indicators of indoor air quality can also be at least one of the carbon dioxide concentration, temperature, humidity, concentration of airborne particulate matter in the air of the room to be detected, and concentration of the refrigerant used for air conditioning. In addition to this, for example, indicators such as the oxygen concentration in the air, carbon monoxide concentration, methane, concentration of flammable gases such as other hydrocarbons, amount of predetermined bacteria or viruses in the air, amount of dust, and specific odors are also included in the "predetermined indicators of indoor air quality".

[0096] In addition, the embodiments, the first, second, and third modified examples can be appropriately combined. For example, a carbon dioxide concentration sensor 2 can also be provided in the area 15a (refer to Figure 2 ) of the ventilation unit 1 (air conditioning unit), and a humidity sensor (not shown) can be provided in the confluence pipe 4b of the intake pipe 4 (refer to Figure 1 ), and further a refrigerant sensor (not shown) can be provided in the exhaust pipe 6. In addition, various combinations can be made for the types and installation positions of the sensors.

[0097] In addition, each embodiment is an example described in detail for easy understanding of the present disclosure, and does not necessarily limit that all the structures described must be provided. In addition, for a part of the structure of each embodiment, addition, deletion, and replacement of other structures can be performed.

[0098] In addition, the above-described mechanisms and structures show the parts considered necessary for explanation, and not all the mechanisms and structures may be shown in the product.

Claims

1. An air conditioning system, characterized in that, Comprising: An air conditioning unit having a first fan and an air suction port, and sucking air through the air suction port along with the driving of the first fan; A first duct connecting the air suction port to multiple rooms respectively; Multiple first air dampers provided in the first duct corresponding to the multiple rooms respectively; A sensor for detecting a predetermined index of the indoor air quality of at least a part of the multiple rooms; and A control unit which, when the predetermined index is detected by the sensor, sets the first air damper corresponding to the room that becomes the detection object of the predetermined index among the multiple first air dampers to the open state, sets the remaining first air dampers to the closed state, and drives the first fan. The sensor is provided in the confluence duct of the first duct, in the flow path of the air flowing through the interior of the air conditioning unit on the downstream side of the confluence duct, or in the exhaust duct through which the air flows on the downstream side of the air conditioning unit.

2. The air conditioning system according to claim 1, wherein: The control unit sequentially switches the rooms that become the detection objects of the predetermined index for at least a part of the multiple rooms.

3. The air conditioning system according to claim 1, wherein: The control unit sequentially switches the rooms that become the detection objects of the predetermined index for all of the multiple rooms.

4. The air conditioning system according to claim 1, wherein: The air conditioning unit has a second fan for allowing air to flow out through the air supply port of the air conditioning unit. This air conditioning system comprises: A second duct connecting the air supply port to the multiple rooms respectively; and Multiple second air dampers provided in the second duct corresponding to the multiple rooms respectively. When the predetermined index is detected by the sensor, the control unit closes the second air damper corresponding to the room that becomes the detection object of the predetermined index among the multiple second air dampers and drives the second fan.

5. The air conditioning system according to claim 1, wherein: The air conditioning unit has a second fan for allowing air to flow out through the air supply port of the air conditioning unit. This air conditioning system further comprises a second duct connecting the air supply port to the multiple rooms respectively. When the predetermined index is detected by the sensor, the control unit maintains the second fan in the stopped state.

6. The air conditioning system according to claim 1, wherein: The control unit repeatedly performs the detection of the predetermined index during the period when the open or closed states of the multiple first air dampers are maintained, and increases the weighting of the detection value of the predetermined index in the second half of this period compared to the first half of this period.

7. The air conditioning system according to any one of claims 1 to 6, wherein: The predetermined index is at least one of the carbon dioxide concentration, temperature, humidity, concentration of airborne particulate matter, and concentration of refrigerant used for air conditioning in the air of the room that becomes the detection object.

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