Co2 separation system

Abstract

A CO2 separation system (1) is a CO２ separation system including a CO2 separation part for separating CO2 from circulating air. The system includes a control part (5) that has a first state in which air in a target space in an indoor space is circulated to the CO2 separation part, and air with a reduced CO2 concentration is blown into the target space, and a second state in which ventilation of the target space is performed. The control part controls the first state and the second state. The CO2 separation part operates so as to increase CO2 separation capacity with an increase in CO2 concentration of air in the target space. The control unit (5) performs the operation in the first state until the CO2 separation capacity in the CO2 separation part reaches a reference value, and performs the operation by combining the first state and the second state when the reference value of the CO2 separation capacity is exceeded.

Description

CO2 Separation System

[0001] The present disclosure provides a method for removing CO from the air in a target space. ２ CO ２ Regarding separation systems.

[0002] Carbon dioxide (CO ２ A volume of air is supplied to the purge gas membrane system to reduce the concentration of CO ２ preferentially passes through the membrane module, ２ The air with reduced concentration remains, and is returned to the space unit (see, for example, Patent Document 1).

[0003] Special Publication No. 2006-512946

[0004] Conventional CO ２ The separation system ２ The module separates CO from the air in the target space. ２ By separating and returning it to the target space, the carbon dioxide (CO ２ ) concentration. ２ In the separation system, CO ２ The decrease in concentration is ２ It depends on the separation ability. ２ If the concentration increases rapidly, ２ It was difficult to reduce the concentration quickly.

[0005] CO of the present disclosure ２ The separation system separates CO from air. ２ CO ２ CO with separation section ２ A separation system that separates the air in a target indoor space into CO ２ The CO ２ The CO ventilator has a first state in which the air with reduced concentration is blown into the target space, and a second state in which the target space is ventilated, and includes a control unit that controls the first state and the second state. ２ The separation unit separates the CO ２ With increasing concentration, CO ２The control unit operates to increase the separation capacity. ２ CO in the separation section ２ The operation continues in the first state until the separation capacity exceeds the reference value. ２ When the separation capacity exceeds the reference value, the operation is performed in a combination of the first and second states.

[0006] CO of the present disclosure ２ The separation system reduces CO ２ The concentration can be reduced quickly.

[0007] FIG. 1 is a diagram illustrating a CO ２ 2 is a schematic diagram of a separation system. ２ 1 is a diagram showing an outline of a separation element; FIG. 3 is a diagram showing an air flow in a first state in embodiment 1; FIG. 4 is a diagram showing an air flow in a second state in embodiment 1; and FIG. 5 is a diagram showing a CO separation element according to embodiment 2. ２ Fig. 6 is a schematic diagram of a separation system. Fig. 7 is a diagram showing an air flow in a first state in embodiment 2. Fig. 8 is a diagram showing an air flow in a second state in embodiment 2.

[0008] Hereinafter, each embodiment of the present disclosure will be described with reference to the drawings. Note that each of the following embodiments is an example of embodying the present disclosure and does not limit the technical scope of the present disclosure. Furthermore, each drawing used in each embodiment is a schematic drawing, and the ratios of the sizes and thicknesses of the components in each drawing do not necessarily reflect the actual dimensional ratios.

[0009] First Embodiment Referring to FIG. 1, a CO ２ The separation system 1 will be described. ２ FIG. 1 is a schematic diagram of a separation system.

[0010] As shown in FIG. 1, a building 2 such as a house is equipped with a CO ２ Separation system 1 is installed. ２ The separation system 1 separates a target gas (e.g., CO ２ It is a device that removes CO ２The separation system 1 includes a housing 10 and a CO ２ A separation element 20, an inside air fan 31, an inside air filter 37, an outside air fan 41, an outside air filter 47, a first flow rate adjustment unit 4a, a second flow rate adjustment unit 4b, a third flow rate adjustment unit 4c, a fourth flow rate adjustment unit 4d, a control unit 5, and an inside air CO ２ The concentration detection unit 7 includes a first backflow suppression unit 8a and a second backflow suppression unit 8b. Here, the first flow rate adjustment unit 4a, the second flow rate adjustment unit 4b, the third flow rate adjustment unit 4c and the fourth flow rate adjustment unit 4d are collectively referred to as the flow rate adjustment unit 4. The first backflow suppression unit 8a and the second backflow suppression unit 8b are collectively referred to as the backflow suppression unit 8.

[0011] The housing 10 is ２ This is the outer frame of the separation system 1. An inside air vent 33, an air supply vent 35, an outside air vent 43, and an exhaust vent 45 are arranged on the outer periphery of the housing 10. An inside air space 23, an air supply space 24, an outside air space 25, and an exhaust space 26 are provided inside the housing 10. Details of each of these spaces will be described later.

[0012] The inside air vent 33 is an opening that draws air from the target space into the housing 10 , and is connected in communication with an indoor air inlet 51 provided in the building 2 by an inside air intake duct 52 .

[0013] The indoor air inlet 51 is an opening provided in the target space of the building 2, and is used to circulate the air (indoor air) in the target space through the CO ２ This is the opening for feeding into the separation system 1.

[0014] The inside air introduction duct 52 is a duct for sending inside air, which is the air in the target space, to the housing 10, and connects the inside air port 33 and the indoor air inlet 51. The inside air introduction duct 52 functions as a return air duct. The inside air passes through the indoor air inlet 51, the inside air introduction duct 52, and the inside air port 33 to return CO ２ It flows towards the internal air space 23 of the separation system 1 .

[0015] The air inlet 35 is ２ CO by separation system 1 ２ This is an opening through which the air (supply air) with reduced concentration is discharged from the housing 10. The air supply port 35 is connected in communication with an indoor air outlet 53 provided in the building 2 by an indoor air outlet duct 54.

[0016] The indoor air outlet 53 is an opening provided in the building 2, and ２ Separation system 1 ２ This is an opening that supplies air (supply air) with reduced concentration to the target space.

[0017] The inside air outlet duct 54 is a duct for sending the air that has circulated through the housing 10 to the target space, and connects the air supply port 35 and the indoor outlet 53. The inside air outlet duct 54 functions as an air supply path. ２ Separation system 1 ２ The air (supply air) with reduced concentration passes from the supply air space 24 through the supply air port 35, the indoor air outlet duct 54, and the indoor air outlet 53 and returns to the target space.

[0018] The outside air vent 43 is an opening that draws outdoor air (external air) into the housing 10. The outside air vent 43 is connected in communication with an outdoor air inlet 55 provided in the building 2 by an outside air intake duct 56.

[0019] The outdoor air inlet 55 is provided in the building 2 and is used to circulate outdoor air (outside air) through the CO ２ This is the opening that feeds the separation system 1.

[0020] The outside air introduction duct 56 is a duct for sending outside air to the housing 10, and connects the outdoor air inlet 55 and the outside air outlet 43. The outside air introduction duct 56 functions as an outside air passage. Outdoor air (outside air) passes through the outdoor air inlet 55, the outside air introduction duct 56, and the outside air outlet 43 to ２ It flows towards the outside air space 25 of the separation system 1 .

[0021] The exhaust port 45 is ２ The separation element 20 ２ This is an opening through which the air with increased concentration or the air blown from the target space is discharged as exhaust air from the housing 10. The exhaust port 45 is connected in communication with an outdoor air outlet 57 provided in the building 2 via an outdoor air outlet duct 58.

[0022] The outdoor air outlet 57 is provided in the building 2. ２ Separation system 1 ２ This is an opening that discharges the air with increased concentration to the outdoors.

[0023] The outside air outlet duct 58 is a duct that discharges the air that has circulated inside the housing 10 to the outside of the housing 10, and connects the exhaust port 45 and the outdoor outlet 57. The outside air outlet duct 58 functions as an exhaust air passage. ２ The separation system 1 separates CO from the target space. ２ CO generated during the process of reducing the concentration ２ The air with high concentration passes through the exhaust port 45, the outside air outlet duct 58, and the outdoor outlet 57 and is discharged outdoors.

[0024] Inside the housing 10, ２ A separation element 20, an inside air fan 31 (circulation fan), an inside air filter 37, an outside air fan 41, an outside air filter 47, a first flow rate adjustment unit 4a, a second flow rate adjustment unit 4b, a third flow rate adjustment unit 4c, a fourth flow rate adjustment unit 4d, a control unit 5, and an inside air CO ２ The concentration detection unit 7, a first backflow suppression unit 8a, and a second backflow suppression unit 8b are attached. The first flow rate adjustment unit 4a, the second flow rate adjustment unit 4b, the third flow rate adjustment unit 4c, and the fourth flow rate adjustment unit 4d are collectively referred to as the flow rate adjustment unit 4. The first backflow suppression unit 8a and the second backflow suppression unit 8b are collectively referred to as the backflow suppression unit 8.

[0025] There are four spaces inside the housing 10. The four spaces are an inside air space 23 communicating with the inside air port 33, an air supply space 24 communicating with the air supply port 35, an outside air space 25 communicating with the outside air port 43, and an exhaust space 26 communicating with the exhaust port 45. The inside air space 23 and the exhaust space 26 are adjacent to each other via a partition wall 27. The air supply space 24 and the outside air space 25 are adjacent to each other via a partition wall 28.

[0026] The partition wall 27 is a structure provided inside the housing 10, and separates the internal air space 23 from the exhaust space 26. The partition wall 27 is provided with a second flow rate adjuster 4b.

[0027] The partition wall 28 is a structure provided inside the housing 10, and separates the air supply space 24 from the outside air space 25. The partition wall 28 is provided with a fourth flow rate adjustment unit 4d.

[0028] The internal air space 23 is formed by the partition wall 27, the second flow rate adjusting unit 4b, and the CO ２The internal air space 23 is a space partitioned by the separation element 20 and communicates with the internal air port 33. The internal air space 23 is adjacent to the exhaust space 26 via the second flow rate adjustment unit 4b and the partition wall 27, and ２ It is adjacent to the air supply space 24 via the separation element 20 .

[0029] The air supply space 24 is formed by a partition wall 28, a fourth flow rate adjusting unit 4d, and a CO ２ The air supply space 24 is a space partitioned by the separation element 20 and communicates with the air supply port 35. The air supply space 24 is adjacent to the outside air space 25 via the fourth flow rate adjustment unit 4d and the partition wall 28, and ２ It is adjacent to the interior air space 23 via the separation element 20 .

[0030] The outside air space 25 is formed by the partition wall 28, the fourth flow rate adjusting unit 4d, and the CO ２ The outside air space 25 is a space partitioned by the separation element 20 and communicates with the outside air port 43. The outside air space 25 is adjacent to the supply air space 24 via the fourth flow rate adjustment unit 4d and the partition wall 28, and ２ It is adjacent to the exhaust space 26 via the separation element 20 .

[0031] The exhaust space 26 is formed by a partition wall 27, a second flow rate adjusting unit 4b, and a CO ２ The exhaust space 26 is a space partitioned by the separation element 20 and communicates with the exhaust port 45. The exhaust space 26 is adjacent to the internal air space 23 via the second flow rate adjustment unit 4b and the partition wall 27, and ２ It is adjacent to the outside air space 25 via the separation element 20 .

[0032] CO ２ The separation element 20 is ２ It functions as a separator, and separates CO from the inside air that has flowed through the inside air intake duct 52. ２ and CO ２ In other words, CO ２ The separation element 20 separates CO ２ It is a material that selectively transmits CO ２ The separation element 20 may be, for example, a plurality of CO ２ The separation membranes 22 are stacked so that a certain distance is created between each membrane.

[0033] where CO ２ CO by the separation element 20２ Figure 2 shows the outline of the separation of CO ２ 1 is a diagram showing an outline of a separation element 20; ２ 1 is a cross-sectional view showing a simplified configuration of a separation element 20. ２ In the separation element 20, an internal internal air passage 16 through which internal air flows from the left side to the right side and an internal external air passage 17 through which external air flows from the left side to the right side are arranged in a vertically overlapping manner. ２ The separation membrane 22 is disposed. The internal air flowing through the internal air duct 16 contains CO ２ 18 and N ２ 19 is mixed in. In reality, the air contains O ２ etc. are mixed in, but for clarity of explanation, ２ The internal air duct 16 is CO ２ When flowing along the separation membrane 22, CO ２ The separation membrane 22 separates the CO ２ 18 and the CO ２ 18 is discharged. This reduces the CO ２ As the concentration of CO 18 decreases, the CO ２ The concentration of 18 increases. The internal air duct 16 is an air duct through which the internal air sent into the housing 10 from the internal air port 33 flows. The air that flows through the internal air duct 16 is discharged to the target space via the air intake port 35. The internal external air duct 17 is an air duct through which the external air sent into the housing 10 from the external air port 43 flows. The air that flows through the internal external air duct 17 is discharged to the outdoors via the exhaust port 45.

[0034] The inside air fan 31 is a blower that is installed in the inside air space 23 and draws inside air from the target space through the inside air port 33 and sends it to the inside air space 23. By driving the inside air fan 31, the flow path of the inside air sent from the target space to the inside air space 23 through the inside air port 33 is changed under the control of the control unit 5, which will be described later. Specifically, the inside air filter 37, the inside air fan 31, the first flow rate adjustment unit 4a, the CO ２The path changes depending on the combination of a first path that reaches the air supply space 24 via the separation element 20 and the first backflow suppression section 8a and is then discharged to the target space via the air supply port 35, and a second path that reaches the exhaust space 26 via the internal air filter 37, the internal air fan 31, and the fourth flow rate adjustment section 4d and is then discharged outdoors via the exhaust port 45.

[0035] The inside air filter 37 removes dirt and dust from the inside air that has flowed into the housing 10 and returns the purified air to the CO ２ This is a filter for supplying air to the separation element 20. The internal air filter 37 is provided in the internal space 23 and is, for example, a HEPA (High Efficiency Particulate Air) filter.

[0036] The outdoor air fan 41 is a blower that is installed in the outdoor air space 25 and introduces outdoor air into the outdoor air space 25 by drawing the outdoor air from outdoors through the outdoor air port 43. By driving the outdoor air fan 41, the outdoor air sent from outdoors to the outdoor air space through the outdoor air port 43 changes its flow path under the control of the control unit 5, which will be described later. Specifically, the outdoor air filter 47, the outdoor air fan 41, the third flow rate adjustment unit 4c, the CO ２ The path changes depending on the combination of a third path that reaches the exhaust space 26 via the separation element 20 and the second backflow suppression section 8b and is discharged outdoors via the exhaust port 45, and a fourth path that reaches the air supply space 24 via the outdoor air filter 47, the outdoor air fan 41 and the fourth flow rate adjustment section 4d and is discharged to the target space via the air supply port 35.

[0037] The outside air filter 47 removes dirt and dust from the outside air that has flowed into the housing 10 and returns the purified air to the CO ２ This is a filter that supplies air to the separation element 20. The outside air filter 47 is provided in the outside air space 25 and is, for example, a HEPA filter.

[0038] Shy CO ２ The concentration detector 7 is attached to the inside air intake duct 52 and detects the CO concentration of the inside air flowing through the inside air intake duct 52. ２ Detect the concentration of CO ２ Since the concentration can be detected using known techniques, a description thereof will be omitted here. ２CO detected by the concentration detection unit 7 ２ The information regarding the concentration is transmitted to the control unit 5 .

[0039] The flow rate adjusting unit 4 is a member that adjusts the flow rate of the air that flows in. The flow rate adjusting unit 4 includes a first flow rate adjusting unit 4 a, a second flow rate adjusting unit 4 b, a third flow rate adjusting unit 4 c, and a fourth flow rate adjusting unit 4 d.

[0040] The first flow rate adjusting unit 4a adjusts the amount of CO ２ adjacent to the separation element 20, ２ The first flow rate adjusting unit 4a is a valve or damper that adjusts the flow rate of air flowing into the separation element 20. When the first flow rate adjusting unit 4a is closed, the air in the internal air space 23 is CO ２ On the other hand, when the first flow rate adjusting unit 4a is open, the air in the internal air space 23 does not flow into the separation element 20. ２ The CO 2 is then introduced into the separation element 20. The opening of the first flow rate adjusting unit 4a is adjusted to ２ The flow rate of air entering the separation element 20 can be adjusted.

[0041] The second flow rate adjustment unit 4b is provided on the partition wall 27 that separates the interior air space 23 and the exhaust space 26, and is a valve or damper that adjusts the flow rate of air flowing from the interior air space 23 to the exhaust space 26. The second flow rate adjustment unit 4b functions as a second connection unit. When the second flow rate adjustment unit 4b is closed, air in the interior air space 23 does not flow into the exhaust space 26. On the other hand, when the second flow rate adjustment unit 4b is open, air in the interior air space 23 flows into the exhaust space 26. Furthermore, the flow rate of air flowing into the exhaust space 26 can be adjusted by adjusting the opening degree of the second flow rate adjustment unit 4b.

[0042] The third flow rate adjusting unit 4c adjusts the amount of CO ２ adjacent to the separation element 20, ２ The third flow rate adjusting unit 4c is a valve or damper that adjusts the flow rate of air flowing into the separation element 20. When the third flow rate adjusting unit 4c is closed, the air in the outside air space 25 ２ On the other hand, when the third flow rate adjusting unit 4c is open, the air in the outside air space 25 does not flow into the separation element 20. ２The CO 2 is then introduced into the separation element 20. ２ The flow rate of air entering the separation element 20 can be adjusted.

[0043] The fourth flow rate adjuster 4d is provided in the partition wall 28 that separates the air supply space 24 and the outdoor air space 25, and is a valve or damper that adjusts the flow rate of air flowing from the outdoor air space 25 into the air supply space 24. The fourth flow rate adjuster 4d functions as a first connection part. When the fourth flow rate adjuster 4d is closed, air in the outdoor air space 25 does not flow into the air supply space 24. On the other hand, when the fourth flow rate adjuster 4d is open, air in the outdoor air space 25 flows into the air supply space 24. Furthermore, the flow rate of air flowing into the air supply space 24 can be adjusted by adjusting the opening degree of the fourth flow rate adjuster 4d.

[0044] The control unit 5 controls the inside air CO ２ CO in the inside air detected by the concentration detection unit 7 ２ The control unit 100 receives the concentration and controls the airflow rates of the inside air fan 31 and the outside air fan 41 and the opening degree of the flow rate adjusting unit 4. A specific control method will be described later.

[0045] The subject of the device, system, or method disclosed herein includes a computer. The computer executes a program to realize the functions of the subject of the device, system, or method disclosed herein. The computer includes, as its main hardware configuration, a processor that operates according to the program. The type of processor is not important as long as it can realize the functions by executing the program. The processor is composed of one or more electronic circuits, including a semiconductor integrated circuit (IC) or an LSI (Large Scale Integration). The multiple electronic circuits may be integrated into a single chip or may be provided on multiple chips. The multiple chips may be integrated into a single device or may be provided on multiple devices. The program is recorded on a non-transitory recording medium, such as a computer-readable read-only memory (ROM), optical disk, or hard disk drive. The program may be pre-stored on the recording medium or may be supplied to the recording medium via a wide area communication network, including the Internet.

[0046] The backflow suppression unit 8 is a member that suppresses the backflow of air in the second or fourth path. ２ The separation system 1 includes a first backflow suppression unit 8a and a second backflow suppression unit 8b as the backflow suppression unit 8.

[0047] The first backflow prevention unit 8a is configured to prevent the CO ２ The separation element 20 is provided adjacent to the air supply space 24. ２ Specifically, the first backflow prevention unit 8a prevents the air that has flowed from the outside air space 25 into the air supply space 24 via the fourth flow rate adjustment unit 4d in the fourth path from flowing into the separation element 20. ２ The first backflow suppression unit 8a prevents the air from flowing into the separation element 20, and allows the air to flow into the supply air passage. A check damper or the like can be used as the first backflow suppression unit 8a. Specifically, when air flows from the outside air space 25 into the supply air space 24 via the fourth flow rate adjustment unit 4d in the fourth path, the pressure in the supply air space 24 increases. ２When the outlet pressure of the separation element 20 is exceeded, CO ２ This causes air to flow back into the separation element 20. However, when a check damper is used as the first backflow suppression unit 8a, the blades mounted on the check damper close to block the flow path, thereby preventing the backflow of air.

[0048] The second backflow prevention unit 8b is configured to prevent the CO ２ The separation element 20 is provided adjacent to the air in the outside air space 25. ２ Specifically, the second backflow prevention unit 8b prevents the air that has flowed from the inside air space 23 into the exhaust space 26 via the second flow rate adjustment unit 4b in the second path from flowing into the separation element 20. ２ The second backflow suppression unit 8b prevents the air from flowing into the separation element 20, and allows the air to flow into the exhaust air passage. A check damper or the like can be used as the second backflow suppression unit 8b. Specifically, when air flows from the inside air space 23 into the exhaust space 26 via the second flow rate adjustment unit 4b in the second passage, the pressure in the exhaust space 26 increases. ２ When the outlet pressure of the separation element 20 is exceeded, CO ２ This causes air to flow back into the separation element 20. However, when a check damper is used as the second backflow suppression unit 8b, the blades mounted on the check damper close to block the flow path, thereby preventing the backflow of air.

[0049] The above is CO ２ 1 shows the configuration of a separation system 1.

[0050] Next, CO ２ The operation of the separation system 1 will now be described. ２ In the separation system 1, the air in the target space is separated from the CO ２ The CO ２ The system operates by combining a first state for reducing the concentration and a second state for ventilating the target space.

[0051] First, using FIG. ２ The air flow when the separation system 1 is operated in the first state will be described below. Fig. 3 is a diagram showing the air flow in the first state in the first embodiment.

[0052] In the first state, CO ２ When the concentration is to be reduced, the indoor air fan 31 and the outdoor air fan 41 are operated. In the first state, the air flowing due to the driving of the indoor air fan 31 is air 39a, and the air flowing due to the driving of the outdoor air fan 41 is air 49a. By driving the indoor air fan 31, the CO 2 present in the target space is reduced. ２ The air with a high concentration is sucked in from the indoor air inlet 51, passes through the indoor air introduction duct 52, and is sent to the indoor air space 23 from the indoor air port 33. By sending the air to the indoor air space 23, the air 39a in the indoor air space 23, whose flow rate has been adjusted by the first flow rate adjustment unit 4a, is ２ At the same time, the outside air is drawn in from the outdoor intake port 55 by driving the outside air fan 41, passes through the outside air introduction duct 56, and is sent to the outside air space 25 from the outside air port 43. By sending the air to the outside air space 25, the air 49a in the outside air space 25, the flow rate of which has been adjusted by the third flow rate adjustment unit 4c, is ２ The air 39a flows into the separation element 20. At this time, the air 39a has a higher concentration of CO than the air 49a. ２ Because of its high concentration, the CO ２ The effect of the separation element 20 is to ２ The concentration of CO decreases. ２ The air 39a with reduced concentration is sent to the air supply space 24, passes through the air supply port 35 and the indoor air outlet 53 via the indoor air outlet duct 54, and is then discharged from the indoor outlet 53 into the target space. ２ The effect of the separation element 20 is to ２ The concentration increases, and CO ２ The air with increased concentration is sent to the exhaust space 26, passes through the exhaust port 45 and the outside air outlet duct 58, reaches the outdoor outlet 57, and is exhausted to the outdoors from the outdoor outlet 57. This is the air flow in the first state.

[0053] Next, using FIG. ２ The air flow when the separation system 1 is operated in the second state will now be described. Fig. 4 is a diagram showing the air flow in the second state in the first embodiment.

[0054] When operating in the second state, the indoor air fan 31 and the outdoor air fan 41 are operated. In the second state, the air flowing due to the driving of the indoor air fan 31 is air 39b, and the air flowing due to the driving of the outdoor air fan 41 is air 49b. By driving the indoor air fan 31, the CO ２ Highly concentrated air is drawn in through indoor air inlet 51, passes through indoor air introduction duct 52, and is sent from indoor air port 33 to indoor air space 23. Of the air in indoor air space 23, air 49a, the flow rate of which has been adjusted by second flow rate adjuster 4b, enters exhaust space 26, travels from exhaust port 45 through outdoor air outlet duct 58, reaches outdoor air outlet 57, and is discharged outdoors through outdoor air outlet 57. At the same time, outdoor air drawn in through outdoor air inlet 55 by driving outdoor air fan 41 passes through outdoor air introduction duct 56 and is sent from outdoor air port 43 to outdoor air space 25. Of the air in outdoor air space 25, air 49b, the flow rate of which has been adjusted by fourth flow rate adjuster 4d, is sent to air supply space 24, travels from air supply port 35 through indoor air outlet duct 54, reaches indoor air outlet 53, and is discharged to the target space through indoor air outlet 53.

[0055] In this way, the indoor air is circulated indoors in the first state and exhausted outdoors in the second state. ２ In the separation system 1, the first state and the second state are simultaneously operated at a predetermined flow rate ratio to separate CO ２ The predetermined flow rate is, for example, ２ CO detected by the concentration detection unit 7 ２ The first state determines the CO concentration. ２ The air 39a with reduced concentration and the air 39b introduced from outdoors in the second state are mixed in the air supply space 24 and are discharged into the target space from the inside air outlet duct 54. At the same time, the CO ２ The air 49a with increased concentration and the air 49b introduced from the target space in the second state are mixed in the exhaust space 26 and are then discharged to the outdoors through the outside air outlet duct 58. ２ Separation system 1 separates CO from inside air into outside air. ２ is emitted, and the CO ２ The increase in concentration is suppressed.

[0056] The flow rate control in the flow rate adjusting unit 4 is performed as follows. ２ Concentration of CO ２ The CO concentration is measured by the concentration detection unit 7. ２ The concentration is transmitted to the control unit 5. ２ A flow control signal corresponding to the concentration is output from the control unit 5 to the flow rate adjusting unit 4. At this time, the inside air CO ２ CO measured by the concentration detection unit 7 ２ The higher the concentration, the more the control unit 5 ２ CO in separation system 1 ２ The flow rate is controlled so as to increase the removal capacity. Specific control operations are described below.

[0057] CO ２ The separation element 20 has a specific CO ２ Therefore, there is an upper limit to the separation capacity. ２ When air is blown to the separation element 20 at a flow rate above a certain level, CO ２ An amount of CO exceeding the upper limit of separation capacity ２ Because the air is blown, appropriate CO ２ Therefore, CO ２ A reference value for separation capacity is set, and flow rate control is performed based on the reference value. ２ The upper limit of the separation capacity of the separation element 20, or CO ２ CO at the maximum blowing amount determined by the pressure loss characteristics of the separation element 20 ２ Separation capabilities, etc. can be used.

[0058] Specifically, first, the internal CO ２ CO measured by the concentration detection unit 7 ２ Required CO based on concentration ２ The amount of CO removed is determined. ２ The removal amount can be calculated, for example, by measuring CO ２ If the concentration is 700 ppm or less, it is equivalent to the CO ２ Emissions equivalent to 1st CO ２ If the removal amount is between 700 ppm and 1000 ppm, it is equivalent to the CO2 equivalent of three people. ２ Secondary CO equivalent to emissions ２If the removal amount is 1000 ppm or more, CO ２ Maximum CO of separation system 1 ２ The amount of CO removed is determined by the first CO ２ Second CO ２ The amount of removal is larger than that of the second CO ２ Maximum CO removal amount ２ The amount of CO removed is greater than the required CO ２ The amount of CO removed ２ When the separation capacity is equal to or less than the reference value, the second flow rate adjusting unit 4b and the fourth flow rate adjusting unit 4d are closed in response to a signal from the control unit 5. Therefore, an air flow is not generated between the inside air space 23 and the exhaust space 26 and between the supply air space 24 and the outside air space 25. ２ If the separation capacity is below the standard value, ２ The separation system 1 operates only in the first state.

[0059] On the other hand, internal CO ２ CO measured by the concentration detection unit 7 ２ Required CO based on concentration ２ The amount of CO removed ２ When the separation capacity exceeds the reference value, the second flow rate adjustment unit 4b and the fourth flow rate adjustment unit 4d are opened in accordance with a signal from the control unit 5, and the opening degrees of the second flow rate adjustment unit 4b and the fourth flow rate adjustment unit 4d are adjusted. Also, the opening degrees of the first flow rate adjustment unit 4a and the third flow rate adjustment unit 4c are adjusted so that the flow rate is smaller than the flow rate during operation in the first state only. Therefore, the opening degrees of the first flow rate adjustment unit 4a, the second flow rate adjustment unit 4b, the third flow rate adjustment unit 4c, and the fourth flow rate adjustment unit 4d are adjusted so that the flow rate is smaller than the flow rate during operation in the first state only. ２ CO measured by the concentration detection unit 7 ２ When the same flow rate of air is blown, the CO concentration due to ventilation is adjusted. ２ The removal capacity is CO ２ CO by the separation element 20 ２ Therefore, by reducing the flow rate of the first state and increasing the flow rate of the second state, ２ Separation system 1 as a whole ２ Therefore, the required CO ２ The amount of CO removed ２The separation capacity exceeds the standard value, and CO ２ When it is desired to reduce the concentration, the opening degrees of the second flow rate adjusting unit 4b and the fourth flow rate adjusting unit 4d are increased, and the opening degrees of the first flow rate adjusting unit 4a and the third flow rate adjusting unit 4c are decreased. ２ The amount of CO removed ２ When the separation capacity exceeds the reference value, the amount of air blown in the first state is reduced and air blown in the second state is started. This allows for quicker CO separation compared to when the system is operated only in the first state. ２ The concentration can be reduced.

[0060] When the first and second states are combined and operated, the required CO ２ The amount of CO removed ２ When the separation capacity falls below the reference value, the second flow rate control unit 4b and the fourth flow rate control unit 4d are closed, and the system is again operated in the first state only. This is because the heat loss of the air in the target space can be suppressed more effectively when the system is operated in the first state only than when the system is operated in a combination of the first and second states. ２ After adjusting the air volume to reduce the amount of CO removed, ２ If the concentration rises, the airflow rate may be adjusted again. If this is repeated, the airflow rate may be changed frequently near the threshold value. To avoid this, for example, ２ CO measured by the concentration detection unit 7 ２ If the concentration remains below the threshold for 30 minutes, ２ It is preferable to perform control such that the air volume is adjusted in a direction to decrease the amount of removal.

[0061] By performing such control, CO ２ Depending on the concentration, CO ２ Separation and ventilation can be operated in combination, so CO ２ CO while suppressing heat loss according to concentration ２ CO concentration can be reduced quickly ２ It may be a separation system 1.

[0062] As described above, the CO ２The separation system 1 can provide the following effects.

[0063] (1) CO ２ The separation system 1 separates CO from air. ２ CO ２ Separation section (CO ２ CO separation element 20 ２ A separation system that separates the air in a target indoor space into CO ２ The CO ２ The CO ventilator has a first state in which the air with reduced CO concentration is blown into the target space, and a second state in which the target space is ventilated, and includes a control unit 5 that controls the first state and the second state. ２ The separation unit separates the CO ２ With increasing concentration, CO ２ The control unit 5 operates to increase the separation capacity. ２ CO in the separation section ２ The operation continues in the first state until the separation capacity exceeds the reference value. ２ When the separation capacity exceeds the reference value, the operation is performed in a combination of the first and second states.

[0064] With this configuration, CO ２ Depending on the concentration, CO ２ Separation and ventilation can be operated in combination. ２ CO while suppressing heat loss according to concentration ２ CO concentration can be reduced quickly ２ It may be a separation system 1.

[0065] (2) The control unit 5 ２ When the separation capacity exceeds the reference value, the amount of air blown in the first state is reduced, and air blown in the second state is started. ２ The CO ２ Ventilation can be performed while suppressing the amount of air blown to the separation element 20 .

[0066] (Embodiment 2) CO according to embodiment 2 ２The separation system 1b differs from the first embodiment in the configuration of the first state and the second state and the control method for the first state and the second state. ２ This is the same as the separation system 1. Hereinafter, the explanation of the contents already explained in the first embodiment will be omitted, and the differences from the first embodiment will be mainly explained.

[0067] Referring to FIG. 5, the CO ２ The separation system 1b will be described. ２ FIG. 1 is a schematic diagram of a separation system.

[0068] CO ２ The separation system 1b is a CO ２ The separation system 1 does not include the flow rate adjusting unit 4, but instead includes an exhaust fan 32 and an intake fan 42. ２ Since it is the same as the separation system 1, the explanation will be omitted.

[0069] The exhaust fan 32 is provided in the partition wall 27 that separates the internal air space 23 and the exhaust space 26, and is a blower that adjusts the flow rate of air flowing from the internal air space 23 to the exhaust space 26. Driving the exhaust fan 32 causes air to flow from the internal air space 23 to the exhaust space 26. The exhaust fan 32 operates at the same timing as the second flow rate adjustment unit 4b in the first embodiment. Therefore, the exhaust fan 32 does not operate in the first state but operates in the second state. Furthermore, by adjusting the airflow rate of the exhaust fan 32, the flow rate of air flowing into the exhaust space 26 can be adjusted.

[0070] The supply air fan 42 is provided in the partition wall 28 that separates the supply air space 24 and the outdoor air space 25, and is a blower that adjusts the flow rate of air flowing from the outdoor air space 25 into the supply air space 24. Driving the supply air fan 42 causes air to flow from the outdoor air space 25 to the supply air space 24. The supply air fan 42 operates at the same timing as the fourth flow rate adjuster 4d in the first embodiment. Therefore, the supply air fan 42 does not operate in the first state but operates in the second state. Furthermore, the flow rate of air flowing into the exhaust space 26 can be adjusted by adjusting the airflow rate of the exhaust fan 32.

[0071] The above is CO ２ This shows the configuration of the separation system 1b.

[0072] Next, CO ２ The operation of the separation system 1b will now be described. ２ In the separation system 1b, the control unit 5 controls the exhaust fan 32 and the intake fan 42 to remove CO ２ CO ２ The device operates by combining a first state for reducing the concentration and a second state for ventilating the target space.

[0073] First, using FIG. ２ The air flow when the separation system 1b is operated in the first state will be described below. Fig. 6 is a diagram showing the air flow in the first state in the second embodiment.

[0074] In the first state, CO ２ To reduce the concentration, the indoor air fan 31 and the outdoor air fan 41 are operated. In the first state, the air flowing due to the driving of the indoor air fan 31 is air 39a, and the air flowing due to the driving of the outdoor air fan 41 is air 49a. By driving the indoor air fan 31, the CO 2 present in the target space is reduced. ２ The air with a high concentration is sucked in through the indoor air inlet 51, passes through the indoor air introduction duct 52, and is sent to the indoor air space 23 through the indoor air port 33. By sending the air to the indoor air space 23, the air 39a in the indoor air space 23 at a flow rate corresponding to the airflow rate of the indoor air fan is CO ２ At the same time, the outside air is drawn in from the outdoor intake port 55 by driving the outside air fan 41, passes through the outside air introduction duct 56, and is sent to the outside air space 25 from the outside air port 43. By sending the air to the outside air space 25, the air 49a in the outside air space 25 at a flow rate according to the blowing rate of the outside air fan 41 is ２ The air 39a flows into the separation element 20. At this time, the air 39a has a higher concentration of CO than the air 49a. ２ Because of its high concentration, the CO ２ The effect of the separation element 20 is to ２ The concentration of CO decreases. ２The air 39a with reduced concentration is sent to the air supply space 24, passes through the air supply port 35 and the indoor air outlet 53 via the indoor air outlet duct 54, and is then discharged from the indoor outlet 53 into the target space. ２ The effect of the separation element 20 is to ２ The concentration increases, and CO ２ The air with increased concentration is sent to the exhaust space 26, passes through the exhaust port 45 and the outside air outlet duct 58, reaches the outdoor outlet 57, and is exhausted to the outdoors from the outdoor outlet 57. This is the air flow in the first state. At this time, the exhaust fan 32 and the supply air fan 42 are not operating.

[0075] Next, using FIG. ２ The air flow when the separation system 1b is operated in the second state will be described below. Fig. 7 is a diagram showing the air flow in the second state in the second embodiment.

[0076] When operating in the second state, the exhaust fan 32 and the supply air fan 42 are operated in addition to the inside air fan 31 and the outside air fan 41. In the second state, the air flowing due to the driving of the inside air fan 31 is air 39b, and the air flowing due to the driving of the outside air fan 41 is air 49b. ２ Highly concentrated air is drawn in through indoor air inlet 51, passes through indoor air introduction duct 52, and is sent from indoor air port 33 to indoor air space 23. Since exhaust fan 32 is operating, air 39b from indoor air space 23 flows into exhaust space 26 at a flow rate corresponding to the airflow rate of exhaust fan 32. Air 39b that has flowed into exhaust space 26 travels from exhaust port 45 through outdoor air outlet duct 58 to outdoor air outlet 57 and is discharged to the outdoors through outdoor air outlet 57. At the same time, outdoor air drawn in through outdoor air inlet 55 by driving outdoor air fan 41 passes through outdoor air introduction duct 56 and is sent from outdoor air port 43 to outdoor air space 25. Since supply air fan 42 is operating, air 49b from outdoor air space 25 flows into supply air space 24 at a flow rate corresponding to the airflow rate of supply air fan 42. The air 49b that has flowed into the air supply space 24 travels from the air supply port 35 through the inside air outlet duct 54 to the indoor air outlet 53, and is then discharged from the indoor air outlet 53 into the target space.

[0077] In this way, the indoor air is circulated indoors in the first state and exhausted outdoors in the second state. ２ In the separation system 1b, the first state and the second state are simultaneously operated at a predetermined flow rate ratio to separate CO ２ The predetermined flow rate is, for example, ２ CO detected by the concentration detection unit 7 ２ The first state determines the CO concentration. ２ The air 39a with reduced concentration and the air 49b introduced from outdoors in the second state are mixed in the air supply space 24 and are discharged into the target space from the inside air outlet duct 54. At the same time, the CO ２ The air 49a with increased concentration and the air 39b sent from the target space in the second state are mixed in the exhaust space 26 and are then discharged to the outside through the outside air outlet duct 58. ２ In the separation system 1b, CO ２ is released, and the CO ２ The increase in concentration is suppressed.

[0078] The airflow rates of the exhaust fan 32 and the intake fan 42 are controlled as follows. ２ Concentration of CO ２ The CO concentration is measured by the concentration detection unit 7. ２ The concentration is sent to the control unit 5, and the control unit 5 ２ A flow control signal corresponding to the concentration is output to the exhaust fan 32 and the intake fan 42. ２ CO measured by the concentration detection unit 7 ２ The higher the concentration, the more CO ２ CO in separation system 1b ２ The flow rate is controlled so as to increase the removal capacity. A specific control operation will be described below.

[0079] CO ２ The separation element 20 has a specific CO ２ Therefore, there is an upper limit to the separation capacity. ２ When air is blown to the separation element 20 at a flow rate above a certain level, CO２ The upper limit of separation capacity is exceeded, and appropriate CO ２ Therefore, CO ２ A reference value for separation capacity is set, and flow rate control is performed based on the reference value. ２ The upper limit of the separation capacity of the separation element 20, or CO ２ CO calculated backward from the required energy saving performance of the entire separation system 1b ２ The upper limit of the power consumption of the fan involved in the separation can be used. For example, ２ The separation element 20 is ２ The closer to the upper limit of separation capacity, the greater the CO2 emissions when airflow is increased. ２ The increase in separation capacity is gradual. ２ The amount of CO removed is equivalent to the amount of CO ２ When increasing the amount of CO ２ There are cases where the total heat loss and fan power consumption when the ventilation air volume is increased is lower than the increase in fan power consumption due to the increase in separation air volume. ２ Increasing separation capacity does not result in energy savings, so CO ２ A baseline value for separation capacity is determined.

[0080] Regarding the control operation, specifically, first, the inside air CO ２ CO measured by the concentration detection unit 7 ２ Required CO based on concentration ２ The amount of CO removed is determined. ２ The removal amount can be calculated, for example, by measuring CO ２ If the concentration is 700 ppm or less, it is equivalent to the CO ２ Emissions equivalent to 1st CO ２ If the removal amount is between 700 ppm and 1000 ppm, it is equivalent to the CO2 equivalent of three people. ２ Secondary CO equivalent to emissions ２ If the removal amount is 1000 ppm or more, CO ２ Maximum CO of separation system 1b ２ The amount of CO removed is determined by the first CO ２ Second CO ２ The amount of removal is larger than that of the second CO ２Maximum CO removal amount ２ The amount of CO removed is greater than the required amount. ２ The amount of CO removed ２ When the separation capacity is below the reference value, the exhaust fan 32 and the supply fan 42 stop operating. Therefore, the air path is configured so that no air flows occur between the inside air space 23 and the exhaust air space 26, and between the supply air space 24 and the outside air space 25. ２ If the separation capacity is below the standard value, ２ The separation system 1b operates only in the first state.

[0081] On the other hand, internal CO ２ CO measured by the concentration detection unit 7 ２ Required CO based on concentration ２ The amount of CO removed ２ When the separation capacity exceeds the reference value, the exhaust fan 32 and the intake fan 42 start operating in accordance with a signal from the control unit 5. Specifically, the required CO ２ The amount of CO removed ２ When the separation capacity exceeds the reference value, the air blowing in the second state is started while maintaining the air blowing volume in the first state. ２ In addition to separation, ventilation can be performed in parallel, so CO ２ The concentration can be reduced.

[0082] When the first and second states are combined and operated, the required CO ２ The amount of CO removed ２ When the separation capacity falls below the reference value, the exhaust fan 32 and the intake fan 42 are stopped and the system operates in the first mode only. This is because the heat loss of the air in the target space can be suppressed more effectively when the system operates in the first mode only than when the system operates in a combination of the first and second modes. ２ After adjusting the air volume to reduce the amount of CO removed, ２ If the concentration rises, the airflow rate may be adjusted again. If this is repeated, the airflow rate may be changed frequently near the threshold value. To avoid this, for example, ２ CO measured by the concentration detection unit 7 ２If the concentration remains below the threshold for 30 minutes, ２ It is preferable to perform control such that the air volume is adjusted in a direction to decrease the amount of removal.

[0083] By performing such control, CO ２ Depending on the concentration, CO ２ Separation and ventilation can be operated in combination, so CO ２ CO while suppressing heat loss according to concentration ２ CO concentration can be reduced quickly ２ It can be a separation system 1b.

[0084] As described above, the CO ２ According to the separation system 1b, the CO ２ In addition to the effect (1) obtained by the separation system 1, the following effect can be enjoyed.

[0085] (3) CO ２ The separation system 1b includes an internal air fan 31 that blows air from a return air duct (internal air duct 52) ​​to a supply air duct (supply air duct 54), and an exhaust fan 32 that blows air from the return air duct (internal air duct 52) ​​to an exhaust air duct (exhaust air duct 58). ２ Separation section (CO ２ CO in the separation element 20 ２ When the separation capacity exceeds the reference value, the exhaust fan 32 starts operating while maintaining the airflow rate of the internal air fan 31. ２ Separation section (CO ２ CO in the separation element 20 ２ Since separation and exhaust can be performed at the same time, CO ２ The concentration can be reduced.

[0086] The present disclosure has been described above based on the embodiments. These embodiments are merely examples, and it will be understood by those skilled in the art that various modifications are possible in the combination of the respective components or the respective treatment processes, and that such modifications are also within the scope of the present disclosure.

[0087] In the first embodiment, the inside air fan 31 is provided in the inside air space 23, but this is not limiting. For example, the inside air fan 31 may be provided in a location upstream of the inside air space 23 and connected to the inside air space 23 (for example, in the inside air introduction duct 52), or in the air supply space 24, or in a location downstream of the air supply space 24 and connected to the air supply space 24 (for example, in the inside air outlet duct 54). In this case, the inside air drawn in from the target space through the inside air port 33 by driving the inside air fan 31 is passed through the inside air filter 37, the first flow rate adjuster 4a, the CO ２ The air passes through the separation element 20 and the first backflow suppression unit 8a and reaches the air supply space 24. Furthermore, by driving the internal air fan 31, outside air is drawn in through the outside air port 43. The drawn outside air passes through the outside air filter 47 and the fourth flow rate adjustment unit 4d and reaches the air supply space 24. The air that has reached the air supply space is discharged into the target space through the air supply port 35.

[0088] In the first embodiment, the outdoor air fan 41 is provided in the outdoor air space 25, but this is not limiting. For example, the outdoor air fan 41 may be provided in a location upstream of the outdoor air space 25 and connected to the outdoor air space 25 (for example, in the outdoor air intake duct 56), or in the exhaust space 26, or in a location downstream of the exhaust space 26 and connected to the exhaust space 26 (for example, in the outdoor air outlet duct 58). In this case, outdoor air drawn in from the outdoors through the outdoor air port 43 by driving the outdoor air fan 41 is passed through the outdoor air filter 47, the third flow rate adjuster 4c, the CO ２ The air passes through the separation element 20 and the second backflow suppression unit 8b and reaches the exhaust space 26. Furthermore, by driving the outside air fan 41, inside air is drawn in through the inside air port 33. The drawn inside air passes through the inside air filter 37 and the second flow rate adjustment unit 4b and reaches the exhaust space 26. The air that has reached the exhaust space 26 is discharged to the outdoors through the exhaust port 45.

[0089] In the second state of the first embodiment, heat exchange may be performed between the first air blown from the outside air duct to the supply air duct and the second air blown from the return air duct to the exhaust air duct. For heat exchange, for example, a heat exchanger may be provided within the housing 10, and a duct for introducing the first air into the heat exchanger, a duct for introducing the second air into the heat exchanger, a duct for introducing the heat-exchanged first air into the exhaust air duct, and a duct for introducing the heat-exchanged second air into the exhaust air duct may be connected to the heat exchanger. This allows heat exchange between the outside air and the inside air before flowing into the target space, thereby reducing heat loss due to ventilation. The heat exchanger may also be provided outside the housing 10. Alternatively, the heat-exchanged first air may be directly introduced into the target space. Similarly, the heat-exchanged second air may be directly exhausted outdoors. Alternatively, heat exchange may be performed between the return air from the target space and the outside air, and the heat-exchanged air may be supplied to the target space.

[0090] In the first embodiment, the outside air is taken into the housing 10 through the outside air port 43, but this is not limiting. The outside air does not necessarily have to be outdoor air, and may be, for example, air outside the target space, which is CO ２ In the case where air from outside the target space is to be drawn in, the outdoor intake port 55 is provided in an appropriate location such as the ceiling.

[0091] An outline of one aspect of the present disclosure is as follows.

[0092] (Item 1) CO from air ２ CO ２ CO separation unit ２ A separation system (1) that separates air in a target space indoors into the CO ２ The CO ２ The air conditioner has a first state in which air having a reduced concentration is blown into the target space, and a second state in which ventilation of the target space is performed, and is provided with a control unit (5) that controls the first state and the second state, ２ The separation unit (20) separates CO from the air in the target space. ２ With increasing concentration, CO ２The control unit (5) operates to increase the separation capacity of the CO ２ The CO in the separation section (20) ２ The operation is performed in the first state until the separation capacity exceeds a reference value, ２ When the separation capacity exceeds the reference value, the CO is operated in a combination of the first state and the second state. ２ Separation system (1).

[0093] (Item 2) The CO control device according to Item 1, wherein the control unit (5) reduces the amount of air blown in the first state and starts blowing air in the second state when the reference value is exceeded. ２ Separation system (1).

[0094] (Item 3) The CO control device according to Item 1, wherein when the reference value is exceeded, the control unit (5) maintains the airflow rate in the first state until the reference value is exceeded, and increases the airflow rate in the second state. ２ Separation system (1).

[0095] (Item 4) The CO ２ a housing (10) having a CO2 separation part (20); an outside air duct (56) for introducing outside air into the housing (10); an exhaust air duct (58) for discharging air that has circulated inside the housing (10) to the outside of the housing (10); a return air duct (52) for introducing air from the target space into the housing (10); and a supply air duct (54) for discharging air that has circulated inside the housing (10) to the target space, wherein the control part (5) is configured to, in the first state, connect the outside air duct (56) and the exhaust air duct (58) in communication with each other via the CO2 separation part, and to connect the return air duct (52) and the supply air duct (54) in communication with each other via the CO2 separation part. ２ 2. The CO ventilator according to claim 1, wherein the outside air duct and the supply air duct are communicatively connected via a separation part, and in the second state, the outside air duct and the supply air duct are communicatively connected, and the return air duct and the exhaust air duct are communicatively connected. ２ Separation system (1).

[0096] (Item 5) The air conditioner further includes a first connection part (4d) that is installed between the outside air duct (56) and the supply air duct (54) and is capable of adjusting the flow rate of air, and a second connection part (4b) that is installed between the return air duct (52) and the exhaust air duct (58) and is capable of adjusting the flow rate of air, wherein the control part (5) closes the first connection part (4d) and the second connection part (4b) until the CO2 concentration in the target space exceeds the reference value, and when the reference value is exceeded, ２ 5. The CO 2 gas analyzer according to claim 4, wherein the opening degrees of the first connecting part (4d) and the second connecting part (4b) are adjusted according to the concentration. ２ Separation system (1).

[0097] (Item 6) The air conditioner includes an internal air fan (31) that blows air from the return air duct (52) to the supply air duct (54), and an exhaust fan (32) that blows air from the return air duct (52) to the exhaust air duct (58), and the control unit (5) ２ The CO in the separation section (20) ２ 5. The CO 2 separation device according to claim 4, wherein when the reference value of the separation capacity is exceeded, the operation of the exhaust fan (32) is started while maintaining the airflow rate of the internal air fan (31). ２ Separation system (1).

[0098] (Item 7) In the second state, heat exchange is performed between a first air blown from the outside air duct (56) to the supply air duct (54) and a second air blown from the return air duct (52) to the exhaust air duct (58). ２ Separation system (1).

[0099] The present disclosure provides a method for detecting CO2 in a crowded target space. ２ CO that can be efficiently removed ２ It is useful as a separation system, etc.

[0100] 1 CO ２ Separation system 1b CO ２ Separation system 2 Building 4 Flow rate adjustment section 4a First flow rate adjustment section 4b Second flow rate adjustment section 4c Third flow rate adjustment section 4d Fourth flow rate adjustment section 5 Control section 7 Internal air CO ２Concentration detection unit 8 Backflow suppression unit 8a First backflow suppression unit 8b Second backflow suppression unit 10 Housing 16 Internal internal air passage 17 Internal external air passage 18 CO ２ 19 N ２ 20 CO ２ Separation element 22 CO ２ Separation membrane 23 Indoor air space 24 Air supply space 25 Outdoor air space 26 Exhaust space 27 Partition wall 28 Partition wall 31 Indoor air fan 32 Exhaust fan 33 Indoor air vent 35 Air supply vent 37 Indoor air filter 39a Air 39b Air 41 Outdoor air fan 42 Air supply fan 43 Outdoor air vent 45 Exhaust vent 47 Outdoor air filter 49a Air 49b Air 51 Indoor air intake vent 52 Indoor air introduction duct 53 Indoor air outlet 54 Indoor air outlet duct 55 Outdoor air intake vent 56 Outdoor air introduction duct 57 Outdoor air outlet 58 Outdoor air outlet duct

Claims

1. CO from the air ２ CO ２ CO with separation section ２ A separation system, comprising: a separation unit for separating air in a target space indoors from the CO ２ The CO ２ The CO ventilator has a first state in which air having a reduced concentration is blown into the target space, and a second state in which the target space is ventilated, and is equipped with a control unit that controls the first state and the second state, ２ The separation unit separates the CO ２ With increasing concentration, CO ２ The control unit operates to increase the separation capacity of the CO ２ The CO in the separation section ２ The operation is performed in the first state until the separation capacity exceeds a reference value, ２ When the separation capacity exceeds the reference value, the CO is operated in a combination of the first state and the second state. ２ Separation system.

2. The CO device according to claim 1, wherein the control unit reduces the amount of air blown in the first state and starts blowing air in the second state when the reference value is exceeded. ２ Separation system.

3. The CO control device according to claim 1, wherein, when the reference value is exceeded, the control unit maintains the airflow rate in the first state until the reference value is exceeded, and increases the airflow rate in the second state. ２ Separation system.

4. Inside the CO ２ the control unit is configured to control the external air duct and the exhaust air duct to separate the CO2 from the external air duct and the exhaust air duct, respectively, in the first state and the second state. ２ The return air duct and the supply air duct are connected to each other via a separation part, and the CO ２ 2. The CO ventilator according to claim 1, wherein the outside air passage and the supply air passage are communicatively connected via a separation part, and in the second state, the return air passage and the exhaust air passage are communicatively connected. ２ Separation system.

5. The system further includes a first connection part that is installed between the outside air duct and the supply air duct and is capable of adjusting the flow rate of air, and a second connection part that is installed between the return air duct and the exhaust air duct and is capable of adjusting the flow rate of air, wherein the control part closes the first connection part and the second connection part until the CO2 in the target space exceeds the reference value, and when the reference value is exceeded, ２ The CO 2 concentration adjusting device according to claim 4, wherein the opening degree of the first connecting portion and the second connecting portion is adjusted according to the concentration. ２ Separation system.

6. The system further includes an internal air fan that blows air from the return air duct to the supply air duct, and an exhaust fan that blows air from the return air duct to the exhaust air duct, and the control unit controls the CO ２ The CO in the separation section ２ The CO 2 control device according to claim 4, wherein, when the separation capacity exceeds the reference value, the exhaust fan is started to operate while maintaining the airflow rate of the internal air fan. ２ Separation system.

7. The CO2 compressor according to claim 4, wherein in the second state, heat exchange occurs between first air blown from the outside air duct to the supply air duct and second air blown from the return air duct to the exhaust air duct. ２ Separation system.

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