Carbon dioxide recovery system

Abstract

A carbon dioxide recovery system is provided with: a blower; a holding unit for holding an adsorbent capable of adsorbing carbon dioxide at a position where the air flow from the blower is received; a sensor that detects that the adsorbent is held by the holding unit; and a control unit that controls the blower, the control unit driving the blower when the sensor detects that the adsorbent is held by the holding unit in a state in which the blower is stopped.

Description

Technical Field

[0001] The present disclosure relates to carbon dioxide recovery systems. Background Art

[0002] Patent Document 1 discloses a technology for collecting carbon dioxide in the air using an adsorbent capable of adsorbing carbon dioxide.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-131166 Summary of the invention

[0006] Problems to be solved by the invention

[0007] When the adsorbent adsorbs carbon dioxide, the carbon dioxide concentration of the air on the surface of the adsorbent gradually decreases. If the carbon dioxide concentration decreases, the recovery efficiency of carbon dioxide based on the adsorbent decreases. Therefore, in order to maintain the recovery efficiency of carbon dioxide, it is preferred to continuously blow air whose carbon dioxide concentration has not decreased onto the adsorbent. In the structure of Patent Document 1, the airflow is blown onto the adsorbent by utilizing the airflow generating unit of the air conditioning device. However, there is a problem that the recovery efficiency of carbon dioxide decreases during the period when the air conditioning device is stopped.

[0008] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a carbon dioxide recovery system capable of suppressing a decrease in the recovery efficiency of carbon dioxide.

[0009] Solutions to Solve Problems

[0010] The carbon dioxide recovery system disclosed in the present invention comprises: a blower; a holding unit that holds an adsorbent capable of adsorbing carbon dioxide at a position that receives the airflow of the blower; a sensor that detects that the adsorbent is held in the holding unit; and a control unit that controls the blower, wherein when the sensor detects that the adsorbent is held in the holding unit when the blower is stopped, the control unit drives the blower.

[0011] Effects of the Invention

[0012] According to the present disclosure, it is possible to provide a carbon dioxide recovery system capable of suppressing a decrease in the recovery efficiency of carbon dioxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram showing the structure of the carbon dioxide recovery system according to the first embodiment.

[0014] Figure 2This is a block diagram showing the structure of the carbon dioxide recovery system according to the first embodiment.

[0015] Figure 3 This is a graph showing an example of the transition of the temperature difference between the surface temperature of the adsorbent and the temperature of the outside air.

[0016] Figure 4 It is a schematic diagram showing the structure of a carbon dioxide recovery system according to a modified example. DETAILED DESCRIPTION

[0017] Implementation Method 1

[0018] Figure 1 1 is a schematic diagram showing the structure of the carbon dioxide recovery system 1 according to the first embodiment. Figure 1 As shown, the carbon dioxide recovery system 1 includes an adsorbent 2, a holding unit 3, and an outdoor unit 4. The outdoor unit 4 is a part of a heat pump device H and is used together with an indoor unit 5. The heat pump device H may be, for example, an air conditioner. The outdoor unit 4 and the indoor unit 5 are connected by a pipe P or the like for circulating the refrigerant. The outdoor unit 4 includes an air blower 4a (fan). The air blower 4a includes a motor 4b (see Figure 2 ). In addition, the outdoor unit 4 includes a compressor, a heat exchanger, etc. which are not shown.

[0019] The adsorbent 2 includes a material capable of adsorbing carbon dioxide. Examples of materials capable of adsorbing carbon dioxide include amines, zeolites, silica gel, diatomaceous earth, alumina, activated carbon, etc. Multiple materials may be selected from the above materials, and materials other than the above materials may be used. Figure 1 The adsorbent 2 shown is in the shape of a rectangular parallelepiped (block), but the shape of the adsorbent 2 can be appropriately changed. For example, the adsorbent 2 can also be granular (e.g., beaded (spherical), granular (cylindrical)). Alternatively, a powdered adsorbent 2 can also be used. In this case, the powdered adsorbent 2 can also be supported on the surface of the substrate. The substrate can be, for example, in the shape of a honeycomb. In addition, the adsorbent 2 can be filled in a permeable container (filling container) and the retaining portion 3 can hold the container.

[0020] Furthermore, the adsorbent 2 is preferably made of a material that separates carbon dioxide when the adsorbent 2 adsorbing carbon dioxide is heated (for example, to 60 to 120° C.). The heating temperature is appropriately changed depending on the specific material of the adsorbent 2 .

[0021] The holding portion 3 can hold the adsorbent 2 at a position where it receives the airflow generated by the blower 4a of the outdoor unit 4. Figure 1 In the embodiment, the holding portion 3 is arranged on the downstream side of the blower 4a. However, the holding portion 3 may be arranged on the upstream side of the blower 4a.

[0022] The holding portion 3 in the present embodiment is a box-shaped container (holding container) capable of accommodating the adsorbent 2 and has air permeability. The holding portion 3 has an opening for allowing the adsorbent 2 to pass therethrough. Figure 1 The opening in the holding portion 3 faces upward, but the position of the opening can be changed. In addition, the holding portion 3 may also have a door that can be opened and closed instead of the opening. In this case, by opening and closing the door, the adsorbent 2 can be stored in the holding portion 3 or taken out from the holding portion 3.

[0023] The structure for imparting air permeability to the holding portion 3 can be appropriately changed, for example, the holding portion 3 can be made entirely or partially mesh-shaped. As an example, when the adsorbent 2 is granular, a plurality of holes smaller than the particle size of the adsorbent 2 can be formed in the holding portion 3. The material of the holding portion 3 can be appropriately changed, and can be metal or resin. As the holding portion 3, structures other than those described above can also be adopted.

[0024] The carbon dioxide recovery system 1 has a sensor 11 for detecting whether the adsorbent 2 is held at a position receiving the airflow of the blower 4a. The sensor 11 may be a weight type. The "weight type" is a method of detecting the presence of the adsorbent 2 by using the weight of the adsorbent 2 itself or the weight of an object including the adsorbent 2. The "object including the adsorbent 2" is, for example, a holder 3 in a state where the adsorbent 2 is stored. In addition to measuring weight, "using weight" also includes pressing a mechanical switch by using weight. Figure 1 As shown, the weight sensor 11 may be disposed at the bottom of the inner side of the holding portion 3 .

[0025] However, the sensor 11 is not limited to the weight method. For example, the sensor 11 may also be an optical method. The optical sensor 11 has a light emitting portion and a light receiving portion. The optical sensor 11 can detect the presence or absence of the adsorbent 2 based on whether the light emitted from the emitting portion is detected by the light receiving portion. The light receiving portion may be arranged at a position to receive light emitted from the emitting portion and reflected by the adsorbent 2. In this case, when the light receiving portion detects the light emitted from the emitting portion, it is determined that the adsorbent 2 is present. Alternatively, the light receiving portion and the emitting portion may be arranged in a relative manner, and the adsorbent 2 is held between the light receiving portion and the emitting portion. In this case, when the light receiving portion does not detect the light emitted from the emitting portion, it is determined that the adsorbent 2 is present. These determinations may be made by the sensor 11 or by the control unit 10 described later.

[0026] Figure 2 1 is a block diagram showing a configuration example of the carbon dioxide recovery system 1. Figure 2As shown, the carbon dioxide recovery system 1 includes a control unit 10, the above-mentioned sensor 11, a rotation speed sensor 12, a wind speed sensor 13, an electric power meter 14, an outside air temperature sensor 15, a surface temperature sensor 16, and a communicator 17. The control unit 10 is connected to each component 11 to 17. In addition, the control unit 10 is connected to the motor 4b of the blower 4a.

[0027] Furthermore, the carbon dioxide recovery system 1 may not include some or all of the rotation speed sensor 12 , the wind speed sensor 13 , the power meter 14 , the outside air temperature sensor 15 , the surface temperature sensor 16 , and the communicator 17 .

[0028] The control unit 10 controls at least the motor 4b of the blower 4a based on the detection or measurement results of the sensor 11, the rotation speed sensor 12, etc. The control unit 10 may also control components other than the blower 4a. For example, the control unit 10 may also control a compressor included in the heat pump device H. As the control unit 10, a processor such as a CPU (Central Processing Unit) may be used.

[0029] The rotation speed sensor 12 measures the rotation speed of the blower 4a. The measurement result of the rotation speed sensor 12 is input to the control unit 10. The control unit 10 may control the blower 4a based on the measurement result of the rotation speed sensor 12.

[0030] The wind speed sensor 13 measures the wind speed of the airflow generated by the blower 4a and received by the adsorbent 2. The measurement result of the wind speed sensor 13 is input to the control unit 10. The control unit 10 may control the blower 4a based on the measurement result of the wind speed sensor 13.

[0031] The power meter 14 measures the power consumption of the motor 4b of the blower 4a. The measurement result of the power meter 14 is input to the control unit 10. The control unit 10 may control the blower 4a based on the measurement result of the power meter 14.

[0032] The outside air temperature sensor 15 measures the outside air temperature around the adsorbent 2. The outside air temperature sensor 15 may measure the temperature inside the holding portion 3 or the temperature outside the holding portion 3. When the outdoor unit 4 has a temperature sensor, the temperature sensor may be used as the outside air temperature sensor 15. As the outside air temperature sensor 15, for example, an electronic thermometer may be used.

[0033] The surface temperature sensor 16 measures the surface temperature of the adsorbent 2. As the surface temperature sensor 16, a non-contact thermometer (for example, an infrared thermometer) is preferred. However, the measurement method of the external air temperature sensor 15 and the surface temperature sensor 16 can be appropriately changed. The measurement results of the external air temperature sensor 15 and the surface temperature sensor 16 are input to the control unit 10. The control unit 10 can also control the air blower 4a based on the measurement results of the external air temperature sensor 15 and the surface temperature sensor 16.

[0034] The communicator 17 communicates with the outside (for example, a mobile terminal 21, a server device 22, an operating unit 23, etc.) based on the control of the control unit 10. The mobile terminal 21 is, for example, a smart phone, a notebook PC, a tablet terminal, etc. An application for operating the heat pump device H may also be installed in the mobile terminal 21. The server device 22 has a processing unit, a storage unit, a communication unit, etc., and is capable of processing and storing information. The server device 22 may be, for example, a cloud server. In addition, the server device 22 may also be set in a data center. The operating unit 23 is a part for operating the heat pump device H. For example, in the case where the heat pump device H is an air conditioner, the operating unit 23 is a remote control that communicates with the indoor unit 5.

[0035] Hereinafter, an example of control performed by the control unit 10 will be described.

[0036] When the heat pump device H is not in operation (for example, when neither the heating operation nor the cooling operation is performed), the blower 4a is usually stopped. Therefore, the airflow does not blow to the adsorbent 2, and the adsorption efficiency of carbon dioxide decreases. Therefore, when the sensor 11 detects that the adsorbent 2 is held in the holding portion 3 when the blower 4a is stopped, the control unit 10 drives the blower 4a. Thus, even when the heat pump device H is not in operation, the airflow can be blown to the adsorbent 2 to promote the adsorption of carbon dioxide.

[0037] In addition, when the heat pump device H is in operation, the air blower 4a is usually driven to blow the air flow to the heat exchanger of the outdoor unit 4. Here, when the retaining portion 3 holds the adsorbent 2, the air flow generated by the air blower 4a is blocked by the adsorbent 2. Therefore, the air volume blown to the heat exchanger of the outdoor unit 4 is reduced, and the heat exchange efficiency may be reduced. Therefore, when the sensor 11 detects that the retaining portion 3 holds the adsorbent 2, the control unit 10 increases the rotation speed of the air blower 4a in the state where the heat pump device H is in operation. In this way, the performance of the heat pump device H and the recovery efficiency of carbon dioxide can be taken into account.

[0038] In addition, the control unit 10 may output a notification signal when it is estimated that the adsorbent 2 has sufficiently adsorbed carbon dioxide. The "notification signal" is a signal for notifying a user or the like of the replacement time of the adsorbent 2. As a specific example, the control unit 10 outputs the notification signal to the mobile terminal 21, the server device 22, the operation unit 23, etc. via the communicator 17.

[0039] When receiving the notification signal, the mobile terminal 21 may display information (message, icon, etc.) prompting the replacement of the adsorbent 2 on the application screen, etc. When receiving the notification signal, the server device 22 may display information prompting the replacement of the adsorbent 2 on a device connected to the server device 22 .

[0040] When receiving the notification signal, the operation unit 23 may display information prompting the replacement of the adsorbent 2 on the display unit (liquid crystal screen, etc.) of the operation unit 23. In addition, "notifying the replacement time of the adsorbent 2" includes not only notifying that the replacement time has arrived, but also notifying that the replacement time will arrive after a specified period of time (e.g., several days).

[0041] The conditions under which the control unit 10 outputs a notification signal can be appropriately set. For example, when the sensor 11 is in a weight mode, the weight change of the adsorbent 2 can be obtained based on the detection result of the sensor 11. When the adsorbent 2 adsorbs carbon dioxide, the weight of the adsorbent 2 increases. When the adsorbent 2 adsorbs a certain degree of carbon dioxide, the adsorption rate of carbon dioxide decreases. In other words, based on the weight change of the adsorbent 2, it is possible to infer the room for the adsorbent 2 to adsorb carbon dioxide. Therefore, the control unit 10 may also output a notification signal when the increase in the weight of the adsorbent 2 exceeds a threshold value. The threshold value can be set based on the result obtained by grasping the weight change of the adsorbent 2 when it adsorbs carbon dioxide through preliminary experiments, etc.

[0042] By outputting a notification signal when the conditions are met, the control unit 10 can prompt the user or the like to replace the adsorbent 2. Moreover, it is possible to avoid the adsorbent 2 whose adsorption efficiency has been reduced from being continuously retained in the retaining unit 3. In addition, the object of prompting the replacement of the adsorbent 2 is not limited to the user of the heat pump device H, and may be, for example, the manager of the building where the heat pump device H is installed, or the maintenance personnel of the heat pump device H, etc.

[0043] In addition, the adsorption efficiency of carbon dioxide based on the adsorbent 2 is related to the amount of airflow passing through the adsorbent 2 (hereinafter referred to as the cumulative air volume). Specifically, when the adsorbent 2 has not fully adsorbed carbon dioxide, the more the airflow blows to the adsorbent 2, the more carbon dioxide is adsorbed. However, as the cumulative air volume increases, the adsorption of carbon dioxide by the adsorbent 2 approaches a saturated state, and the adsorption efficiency gradually decreases. In other words, it is possible to infer the room for the adsorbent 2 to adsorb carbon dioxide based on the cumulative air volume passing through the adsorbent 2. Therefore, the control unit 10 may also output a notification signal when the cumulative air volume passing through the adsorbent 2 exceeds a threshold value. The threshold value can be set based on the results obtained by grasping the change in the adsorption amount of carbon dioxide when the airflow is continuously blown to the adsorbent 2 through preliminary experiments, etc.

[0044] The cumulative air volume that has passed through the adsorbent 2 can be estimated, for example, based on the length of time that the adsorbent 2 is detected by the sensor 11, the rotation speed of the blower 4a measured by the rotation speed sensor 12, and the driving time of the blower 4a. Alternatively, the cumulative air volume can be estimated based on the length of time that the adsorbent 2 is detected by the sensor 11 and the measurement result of the wind speed sensor 13. Alternatively, the cumulative air volume can be estimated based on the length of time that the adsorbent 2 is detected by the sensor 11 and the measurement result of the power meter 14. The power consumption of the blower 4a is related to the driving amount of the blower 4a (the product of the driving time and the rotation speed), and therefore, the cumulative air volume can be estimated using the measurement result of the power meter 14.

[0045] In addition, when the adsorbent 2 adsorbs carbon dioxide, the surface temperature of the adsorbent 2 changes. For example, in the case of a zeolite-based adsorbent 2, the surface temperature of the adsorbent 2 rises due to the reaction heat generated by the adsorption of carbon dioxide. Therefore, it is possible to infer whether the adsorption of carbon dioxide in the adsorbent 2 is in progress based on the temperature change of the adsorbent 2. Here, the surface temperature of the adsorbent 2 also changes according to the temperature of the outside air. Therefore, the difference between the surface temperature of the adsorbent 2 and the temperature of the outside air (hereinafter referred to as "temperature difference") can be used. By using this temperature difference, the influence of the temperature change of the outside air can be eliminated.

[0046] Figure 3This is a graph showing an example of the transition of the temperature difference. The horizontal axis represents the time that the adsorbent 2 is held in the holding portion 3, and the vertical axis represents the above-mentioned temperature difference. The origin of the horizontal axis (T=0) is the moment when the holding portion 3 holds the adsorbent 2. When the holding portion 3 holds the adsorbent 2, the adsorbent 2 starts to adsorb carbon dioxide, and the temperature difference increases due to the heat of reaction. At time T=t1, the temperature difference reaches a maximum, and then the temperature difference decreases. This means that the amount of carbon dioxide adsorbed by the adsorbent 2 per unit time decreases. Then, at time T=t2, the temperature difference reaches zero. This means that the adsorption of carbon dioxide by the adsorbent 2 is saturated, and the adsorption reaction stops.

[0047] The control unit 10 may determine that the adsorption of carbon dioxide by the adsorbent 2 is complete and output a notification signal when the temperature difference reaches 0 after time T=0. Alternatively, the control unit 10 may output a notification signal when the temperature difference falls below a threshold after time T=t1 (that is, after the temperature difference reaches a maximum).

[0048] As described above, the carbon dioxide recovery system 1 of the present embodiment includes: a blower 4a; a holding part 3 that holds an adsorbent 2 capable of adsorbing carbon dioxide at a position receiving the airflow of the blower 4a; a sensor 11 that detects that the adsorbent 2 is held in the holding part 3; and a control part 10 that controls the blower 4a. Moreover, when the sensor 11 detects that the adsorbent 2 is held in the holding part 3 when the blower 4a is stopped, the control part 10 drives the blower 4a. According to such a carbon dioxide recovery system 1, even when the heat pump device H is not operating, the airflow can be blown to the adsorbent 2, and the reduction in the recovery efficiency of carbon dioxide can be suppressed. In particular, when the heat pump device H is an air conditioner, the outdoor unit 4 can be effectively used to recover carbon dioxide in seasons with low operating rates (for example, spring and autumn in Japan).

[0049] In addition, the holding part 3 in the present embodiment is a container having air permeability. Thus, the position of holding the adsorbent 2 is stabilized, and therefore the adsorbent 2 can be detected more reliably by the sensor 11.

[0050] In addition, the blower 4a in this embodiment is a fan provided in the outdoor unit 4 of the heat pump device H. When the heat pump device H is not operating, even if the fan of the outdoor unit 4 is driven, the noise and the like have little impact on the room. Therefore, the recovery of carbon dioxide can be promoted while suppressing the impact on the living space and the like.

[0051] Alternatively, the control unit 10 may increase the rotation speed of the blower 4a when the sensor 11 detects that the holder 3 holds the adsorbent 2 while the heat pump device H is operating. In this case, the performance of the heat pump device H may be reduced due to the airflow of the blower 4a being blocked by the adsorbent 2.

[0052] In addition, the sensor 11 may detect that the adsorbent 2 is held in the holding portion 3 by weight. That is, the sensor 11 may be a weight type. Furthermore, the control unit 10 may output a notification signal for notifying the replacement time of the adsorbent 2 based on the increase in weight detected by the sensor 11. In this case, it is possible to avoid leaving the adsorbent 2 that has completed the adsorption of carbon dioxide intact.

[0053] In addition, the sensor 11 may be an optical sensor. In this case, the sensor 11 can be miniaturized.

[0054] In addition, the control unit 10 may estimate the cumulative air volume passing through the adsorbent 2 based on the detection result of the sensor 11 and the measurement result of the rotation speed sensor 12 that measures the rotation speed of the blower 4a. Alternatively, the control unit 10 may estimate the cumulative air volume based on the detection result of the sensor 11 and the measurement result of the wind speed sensor 13 that measures the wind speed of the airflow passing through the adsorbent 2. Alternatively, the control unit 10 may estimate the cumulative air volume based on the detection result of the sensor 11 and the power meter 14 that measures the power consumption of the motor 4b of the blower 4a.

[0055] In addition, the control unit 10 may output a notification signal notifying the replacement time of the adsorbent 2 based on the estimation result of the cumulative air volume. The control unit 10 may estimate the cumulative air volume using the rotation speed sensor 12, the wind speed sensor 13, and the power meter 14, respectively, and output a notification signal when any of the estimation results meets the conditions. In addition, the control unit 10 may output a notification signal based on the change in the difference between the outside air temperature sensor 15 measuring the temperature of the outside air and the surface temperature sensor 16 measuring the surface temperature of the adsorbent 2.

[0056] In addition, the carbon dioxide recovery system 1 may also include a communicator 17. Furthermore, the communicator 17 may also transmit the notification signal output by the control unit 10 to any one or all of the mobile terminal 21, the server device 22, and the operation unit 23. In this case, the user, manager, maintenance personnel, etc. of the heat pump device H can be prompted to replace the adsorbent 2.

[0057] In addition, the technical scope of the present disclosure is not limited to the above-mentioned embodiment, and various modifications can be added within the scope not departing from the gist of the present disclosure.

[0058] For example, the air blower 4a in the above embodiment is a fan of the outdoor unit 4. Figure 4 As shown, a ventilation fan 31 installed in a building 30 may be used as a blower. In addition, a holding portion 33 may be provided at the lower portion of a cover 32 covering the ventilation fan 31 from the outside of the building 30 . Figure 4The holder 33 shown extends substantially horizontally from the wall surface of the building 30, and can hold the adsorbent 2 at the upper portion of the holder 33. The airflow sucked into the building 30 by the ventilating fan 31 or the airflow discharged from the building 30 by the ventilating fan 31 passes through the lower portion of the cover 32. Therefore, when the adsorbent 2 is held in the holder 33, the airflow blows onto the adsorbent 2. Figure 4 As shown, the holding portion 33 may also have a vent 33a. In this case, the holding portion 33 has air permeability, making it easier for the airflow to blow to the adsorbent 2. The holding portion 33 may also have air permeability by adopting other structures.

[0059] Furthermore, a sensor 11 for detecting that the adsorbent 2 is held in the holding portion 33 is provided near the wall surface of the building 30. Furthermore, the ventilating fan 31 is connected to a control portion 10 (not shown).

[0060] Figure 4 The carbon dioxide recovery system shown also includes: a blower (ventilation fan 31); a holding portion 33 that holds an adsorbent 2 capable of adsorbing carbon dioxide at a position receiving the airflow of the blower; a sensor 11 that detects that the adsorbent 2 is held in the holding portion 33; and a control portion 10 that controls the blower. When the sensor 11 detects that the adsorbent 2 is held in the holding portion 33 when the blower is stopped, the control portion 10 drives the blower. With such a structure, it is also possible to suppress a decrease in the adsorption efficiency of carbon dioxide by the adsorbent 2, as in Embodiment 1.

[0061] In addition, the control unit 10 has a computer system inside. Moreover, a program for realizing the functions of each structure of the carbon dioxide recovery system 1 may be stored in a computer-readable storage medium, and the processing of the control unit 10 may be performed by making the computer system read and execute the program stored in the storage medium. In addition, the processing may be performed by hardware other than the control unit 10.

[0062] Here, "causing a computer system to read and execute a program stored in a storage medium" includes installing the program in the computer system. The "computer system" mentioned here includes hardware such as an OS and peripheral devices.

[0063] In addition, the "computer system" may also include multiple computer devices connected via a network including the Internet, WAN, LAN, dedicated lines and other communication lines. In addition, "computer-readable storage medium" refers to removable media such as floppy disks, magneto-optical disks, ROMs, CD-ROMs, and storage devices such as hard disks built into the computer system. In this way, the storage medium storing the program may also be a non-temporary storage medium such as a CD-ROM.

[0064] In addition, the storage medium also includes an internal or external storage medium that can be accessed from a publishing server in order to publish the program. In addition, it is also possible to divide the program into multiple parts and merge them into each structure possessed by the carbon dioxide recovery system 1 after downloading them at different times. In addition, the publishing servers that publish the divided programs can also be different. In addition, the "computer-readable storage medium" also includes a storage medium that keeps the program for a certain period of time, such as a volatile memory (RAM) inside a computer system that becomes a server or client when sending a program via a network. In addition, the above-mentioned program may also be a program for realizing a part of the above-mentioned functions. In addition, it may also be a program that can realize the above-mentioned functions by combining with a program already stored in a computer system, i.e., a so-called differential file (differential program).

[0065] In addition, the above-mentioned modifications may be combined or each component may be appropriately modified or omitted.

[0066] Description of Reference Numerals

[0067] 1 Carbon dioxide recovery system 2 Adsorbent 3 Holding unit 4 Outdoor unit 4a Blower (fan of outdoor unit) 4b Motor 5 Indoor unit 10 Control unit 11 Sensor 12 Rotation speed sensor 13 Wind speed sensor 14 Electricity meter 15 Outside air temperature sensor 16 Surface temperature sensor 17 Communicator 21 Mobile terminal 22 Server device 23 Operation unit 31 Blower (ventilating fan) H Heat pump device.

Claims

1. A carbon dioxide recovery system, wherein: The carbon dioxide recovery system comprises: Blower; a holding portion that holds an adsorbent capable of adsorbing carbon dioxide at a position receiving the airflow from the blower; a sensor that detects that the adsorbent is held in the holding portion; and a control unit, which controls the blower, When the sensor detects that the adsorbent is held by the holding portion in a state where the blower is stopped, the control portion drives the blower.

2. The carbon dioxide recovery system according to claim 1, wherein: The holding portion is an air-permeable container.

3. The carbon dioxide recovery system according to claim 1 or 2, wherein: The air blower is a fan included in an outdoor unit of the heat pump device.

4. The carbon dioxide recovery system according to claim 3, wherein: When the sensor detects that the adsorbent is held in the holding portion while the heat pump device is operating, the control portion increases the rotation speed of the air blower.

5. The carbon dioxide recovery system according to any one of claims 1 to 4, wherein: The sensor detects, by weight, that the adsorbent is held in the holding portion. The control unit outputs a notification signal for notifying a replacement time of the adsorbent based on an increase in weight detected by the sensor.

6. The carbon dioxide recovery system according to any one of claims 1 to 4, wherein: The sensor is an optical sensor.

7. The carbon dioxide recovery system according to any one of claims 1 to 6, wherein: A rotation speed sensor is also provided to measure the rotation speed of the blower. The control unit estimates a cumulative air volume that has passed through the adsorbent based on a detection result of the sensor and a measurement result of the rotation speed sensor, and outputs a notification signal for notifying a replacement time of the adsorbent based on the cumulative air volume.

8. The carbon dioxide recovery system according to any one of claims 1 to 7, wherein: A wind speed sensor is also provided to measure the wind speed of the air flow passing through the adsorbent. The control unit estimates a cumulative air volume that has passed through the adsorbent based on a detection result of the sensor and a measurement result of the wind speed sensor, and outputs a notification signal for notifying a replacement time of the adsorbent based on the cumulative air volume.

9. The carbon dioxide recovery system according to any one of claims 1 to 8, wherein: The device further comprises an electric power meter for measuring the electric power consumption of the motor of the blower. The control unit estimates a cumulative air volume that has passed through the adsorbent based on a detection result of the sensor and a measurement result of the power meter, and outputs a notification signal for notifying a replacement time of the adsorbent based on the cumulative air volume.

10. The carbon dioxide recovery system according to any one of claims 1 to 9, wherein: Also available: an outside air temperature sensor that measures the temperature of outside air; and a surface temperature sensor for measuring the surface temperature of the adsorbent, The control unit outputs a notification signal for notifying a replacement time of the adsorbent based on a change in a difference between a temperature of the outside air and a surface temperature of the adsorbent.

11. The carbon dioxide recovery system according to any one of claims 5, 7 to 9, wherein: It also has a communicator. The communicator transmits the notification signal output by the control unit to at least one of a mobile terminal, a server device, and an operation unit of a heat pump device.

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