Air conditioning management system and air conditioning management method

Abstract

To provide an air conditioning management system capable of coping with load fluctuation in an air conditioning object space.SOLUTION: A control device (10) constituting an air conditioning management system (1) determines the air volume of a first return air (106) and the air volume of a second return air (107) according to the state of control of the flow rate of cold water by a cold water flow rate adjusting valve (24), and controls the air volume of a second mixture air (103) delivered as air supply from an air supply fan (53) to a space (200) to be air conditioned according to the determined air volume of the first return air (106) and the determined air volume of the second return air (107).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an air conditioning control system and an air conditioning control method. [Background technology]

[0002] A known technology involves providing dampers capable of changing the air volume in each of the return air flow path and the bypass flow path that branches off from the return air flow path and communicates with the secondary side of the cooling coil and heating coil, and controlling the operation of the supply air fan that sends supply air to the space to be air-conditioned according to the ratio of the air volume in the return air flow path to the air volume in the bypass flow path (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6901643 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional technology, the ratio between the air volume of the return air passage and the air volume of the bypass passage is predetermined as a fixed value, and therefore there are cases where it is not possible to respond to load fluctuations in the space to be air-conditioned.

[0005] An object of the present invention is to provide an air conditioning management system that can respond to load fluctuations in a space to be air-conditioned. [Means for solving the problem]

[0006] The invention described in claim 1 includes a return air flow path for circulating return air from an air-conditioned space to be air-conditioned, a first space into which first return air, which is at least a part of the return air, and fresh air from outside are sent, a cold water flow path for circulating cold water for cooling a first mixture formed by mixing the first return air and the fresh air in the first space with a cooling coil, a flow rate control means for controlling the flow rate of the cold water in the cold water flow path in accordance with a load in the air-conditioned space, a second space into which the first mixture is sent after passing through the cooling coil and further through a heating coil that heats the first mixture, a bypass flow path branching from the return air flow path and communicating the return air flow path with the second space, and a branch point where the bypass flow path branches from the return air flow path. a first air volume control means provided in the bypass flow path on the first space side for controlling the volume of the first return air; a second air volume control means provided in the bypass flow path for controlling the volume of second return air circulating through the bypass flow path among the return airs; a supply air fan for sending the second mixture, obtained by mixing the first mixture and the second return air in the second space, to the space to be air-conditioned as supply air; air volume determination means for determining the volume of the first return air and the volume of the second return air depending on the control status of the flow rate of the chilled water by the flow control means; and a supply air control means for controlling the volume of the supply air sent from the supply air fan to the space to be air-conditioned in accordance with the determined volume of the first return air and the volume of the second return air. The invention described in claim 2 is the air conditioning management system described in claim 1, characterized in that the flow rate control means controls the flow rate of the chilled water by controlling an adjustment valve provided in the chilled water flow path that can adjust the opening of the chilled water flow path, and the air volume determination means determines the air volume of the first return air and the air volume of the second return air depending on the opening of the chilled water flow path by the adjustment valve. The invention described in claim 3 is the air conditioning management system described in claim 1, characterized in that the air volume determination means determines the air volume of the first return air and the air volume of the second return air in predetermined time units or in real time. The invention described in claim 4 is the air conditioning management system described in claim 1, characterized in that it further has a differential pressure control means for controlling the indoor differential pressure, which is the difference in air pressure between the air-conditioned space and the outside, measured separately, by changing the volume of outside air sent to the first space. The invention described in claim 5 is the air conditioning management system described in claim 4, further comprising an outdoor air fan that sends the outdoor air into the first space, and the differential pressure control means controls the indoor differential pressure by changing the volume of the outdoor air sent from the outdoor air fan to the first space. The invention described in claim 6 is the air conditioning management system described in claim 4, characterized in that the differential pressure control means controls the indoor differential pressure by causing the first air volume control means to change the air volume of the first return air, and as a result, changing the air volume of the outside air sent to the first space. The invention described in claim 7 is the air conditioning management system described in claim 4, characterized in that the differential pressure control means controls the indoor differential pressure by instructing the supply air control means to change the supply air volume, and as a result, changing the volume of the outside air sent into the first space. The invention described in claim 8 is an air conditioning system including: circulating return air from an air-conditioned space to be air-conditioned through a return air flow path; sending first return air, which is at least a part of the return air, and fresh air from outside into a first space; circulating cold water through a cold water flow path for cooling a first mixture obtained by mixing the first return air and the fresh air in the first space with a cooling coil; controlling the flow rate of the cold water in the cold water flow path according to a load in the air-conditioned space; sending the first mixture, which has passed through the cooling coil and further passed through a heating coil that heats the first mixture, into a second space; communicating the return air flow path with the second space through a bypass flow path branched off from the return air flow path; an air conditioning management method comprising: controlling the air volume of the first return air by a first air volume control means provided on the first space side of the branching point; controlling the air volume of second return air circulating through the bypass flow path by a second air volume control means provided in the bypass flow path; sending the second mixture, obtained by mixing the first mixture and the second return air in the second space, to the space to be air-conditioned as supply air by an air supply fan; determining the air volumes of the first return air and the second return air according to the control status of the flow rate of the chilled water; and controlling the air volume of the supply air sent from the air supply fan to the space to be air-conditioned in accordance with the determined air volumes of the first return air and the second return air. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide an air conditioning management system that can respond to load fluctuations in a space to be air conditioned. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram showing an example of the overall configuration of an air conditioning management system to which the present embodiment is applied. [Figure 2] 2 is a diagram illustrating an example of a hardware configuration of a control device that constitutes the air conditioning management system of FIG. 1. FIG. [Figure 3] 3 is a diagram illustrating an example of the functional configuration of a control unit of a control device having the hardware configuration of FIG. 2. [Figure 4]10 is a flowchart showing an example of a processing flow of a control device. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. <Configuration of Air Conditioning Control System 1> FIG. 1 is a diagram showing an example of the overall configuration of an air conditioning management system 1 to which this embodiment is applied. The air conditioning management system 1 shown in Fig. 1 has a control device 10 that performs overall control of the air conditioning management system 1. The control device 10 is connected by wire or wirelessly to various devices and equipment that make up the air conditioning management system 1, enabling the exchange of various types of information.

[0010] The air conditioning management system 1 has an outside air fan 51 that takes in air present outside (hereinafter referred to as "outside air") 101. The drive of the outside air fan 51 is controlled by an inverter 52 based on control information from the control device 10. The inverter 52 controls the drive of the outside air fan 51 by adjusting the frequency of the outside air fan 51 based on the control information from the control device 10.

[0011] The air conditioning management system 1 also has a first space 11 into which outside air 101 taken in by an outside air fan 51 is sent. The air volume of the outside air 101 taken in by the outside air fan 51 is measured by an air volume sensor 41, and the temperature is measured by a temperature sensor 61. The air volume measured by the air volume sensor 41 and the temperature measured by the temperature sensor 61 are each acquired by the control device 10.

[0012] In the air conditioning management system 1, the air sent into the first space 11 is not limited to the outside air 101 taken in by the outside air fan 51. First return air 106, which is at least a part of the return air 105 from a space to be air-conditioned (hereinafter referred to as the "air-conditioned space") 200, is also sent into the first space 11. Specifically, the air conditioning management system 1 has a return air flow path 15 that circulates the return air 105 from the air-conditioned space 200.

[0013] The first return air 106 that has flowed through the return air flow path 15 and the outside air 101 that has been taken in by the outside air fan 51 are mixed together and sent into the first space 11. As a result, a first mixture 102 in which the first return air 106 and the outside air 101 are mixed is present in the first space 11. Note that in Figure 1, the air-conditioned space 200 is drawn small for the sake of convenience to make it easier to understand the overall configuration of the air conditioning management system 1, but in reality it is a space such as a room where people are active.

[0014] The first space 11 is provided with a filter 21 that filters a first air-fuel mixture 102 obtained by mixing the first return air 106 and the outside air 101. The first space 11 is also provided with a cooling coil 22 that cools the first air-fuel mixture 102 from which foreign matter has been removed by passing through the filter 21, and a cold water flow path 23 that circulates cold water for cooling the cooling coil 22. The cooling coil 22 cools the first air-fuel mixture 102 by exchanging heat between the first air-fuel mixture 102 that has passed through the filter 21 and the cold water flowing through the cold water flow path 23. The cold water flow path 23 is connected to a refrigerator (not shown) that re-cools the cold water used to cool the cooling coil 22, and circulates the cold water between the refrigerator and the cooling coil 22.

[0015] The cold water flow path 23 is provided with a cold water flow rate adjustment valve 24 as a flow rate control means for controlling the flow rate of cold water flowing through the cold water flow path 23. The cold water flow rate adjustment valve 24 controls the flow rate of cold water by opening and closing a solenoid valve that can adjust the opening degree of the cold water flow path 23. The cold water flow rate adjustment valve 24 controls the flow rate of cold water based on control information from the control device 10.

[0016] The air conditioning management system 1 also has a heating coil 25 that heats the first air-fuel mixture 102 that has passed through the cooling coil 22, and a humidifier 26 that humidifies the first air-fuel mixture 102 that has passed through the heating coil 25. The humidifier 26 humidifies the first air-fuel mixture 102 when the humidity of the first air-fuel mixture 102 that has passed through the heating coil 25 is lower than the target humidity in the air-conditioned space 200.

[0017] The air conditioning management system 1 also has a second space 12 to which the first mixture 102, humidified as necessary by a humidifier 26, is sent. Here, the air sent to the second space 12 is not limited to the first mixture 102. Second return air 107, which is at least a part of the return air 105 from the air-conditioned space 200, is also sent to the second space 12. Specifically, the air conditioning management system 1 has a bypass flow path 18, which is a flow path branched from the return air flow path 15 and connects the return air flow path 15 to the second space 12. The second return air 107 and the first mixture 102 that have circulated through the bypass flow path 18 are sent to the second space 12. As a result, a second mixture 103, which is a mixture of the second return air 107 and the first mixture 102, is present in the second space 12.

[0018] The second space 12 has a supply air fan 53 that sends the second air-fuel mixture 103 as supply air toward the air-conditioned space 200. The drive of the supply air fan 53 is controlled by an inverter 54 based on control information from the control device 10. The inverter 54 controls the drive of the supply air fan 53 by adjusting the frequency of the supply air fan 53 based on the control information from the control device 10.

[0019] The second air-fuel mixture 103 sent out as supply air from the air supply fan 53 has its air volume measured by the air volume sensor 42 and its temperature measured by the temperature sensor 62. The air volume measured by the air volume sensor 42 and the temperature measured by the temperature sensor 62 are each acquired by the control device 10.

[0020] The second air-fuel mixture 103 sent as supply air from the air supply fan 53 toward the air-conditioned space 200 is used for air conditioning by circulating through the air-conditioned space 200. The air-conditioned space 200 is provided with a temperature sensor 63 that measures the temperature, and a differential pressure gauge 71 that measures the indoor differential pressure, which is the difference in air pressure between the air-conditioned space 200 and the outside.

[0021] The temperature of the second air-fuel mixture 103 sent as supply air from the supply air fan 53 to the air-conditioned space 200 is measured by a temperature sensor 63 provided in the air-conditioned space 200, and the indoor differential pressure is measured by a differential pressure gauge 71. The temperature measured by the temperature sensor 63 and the indoor differential pressure measured by the differential pressure gauge 71 are each acquired by the control device 10.

[0022] At least a portion of the second air-fuel mixture 103 circulated through the air-conditioned space 200 for air conditioning is sent out from the exhaust fan 55 to the outside as exhaust air 104, and at least a portion of the second air-fuel mixture 103 circulates through the return air flow path 15 as return air 105. The exhaust fan 55 is a fan whose drive is controlled by an inverter 56 based on control information from the control device 10. The inverter 56 controls the drive of the exhaust fan 55 by adjusting the frequency of the exhaust fan 55 based on the control information from the control device 10.

[0023] The return air 105 flowing through the return air flow path 15 is divided into two at the branch point 16. Specifically, at least a part of the return air 105 flows as first return air 106 through the return air flow path 15 and is sent into the first space 11. In addition, at least a part of the return air 105 flows as second return air 107 through the bypass flow path 18 and is sent into the second space 12.

[0024] An air volume sensor 43 is provided in the return air flow path 15 downstream of the branch point 16 on the first space 11 side, to measure the volume of the first return air 106 flowing through the return air flow path 15. Further downstream, a first damper 31 is provided as a first air volume control means for controlling the volume of the first return air 106 flowing through the return air flow path 15. The first damper 31 controls the volume of the first return air 106 by opening and closing at an arbitrary opening degree using an actuator (not shown). The opening and closing of the first damper 31 is controlled based on control information from the control device 10.

[0025] An air volume sensor 44 is provided in the bypass flow path 18, which branches off from the return air flow path 15 at the branch point 16, to measure the volume of the second return air 107 flowing through the bypass flow path 18. Further downstream, a second damper 32 is provided as a second air volume control means for controlling the volume of the second return air 107 flowing through the bypass flow path 18. The second damper 32 controls the volume of the second return air 107 by opening and closing at an arbitrary opening degree using an actuator (not shown). The opening and closing of the second damper 32 is controlled based on control information from the control device 10.

[0026] The control device 10 functions as an air volume determination means, an air supply control means, and a differential pressure control means. For example, when functioning as an air volume determination means, the control device 10 determines the air volumes of the first return air 106 and the second return air 107 depending on the state of control of the flow rate of chilled water by the chilled water flow rate adjustment valve 24. In this case, the control device 10 determines the air volumes of the first return air 106 and the second return air 107 depending on the state of the opening of the chilled water flow path 23 by the solenoid valve of the chilled water flow rate adjustment valve 24. Here, the timing at which the control device 10 determines the air volumes of the first return air 106 and the second return air 107 is not particularly limited. For example, the control device 10 determines the air volumes of the first return air 106 and the second return air 107 in predetermined time units or in real time.

[0027] Furthermore, for example, when the control device 10 functions as an air supply control means, it controls the air volume of the second mixture 103 sent out as supply air from the air supply fan 53 toward the air-conditioned space 200 in accordance with the determined air volumes of the first return air 106 and the second return air 107.

[0028] Furthermore, for example, when the control device 10 functions as differential pressure control means, it controls the indoor differential pressure by changing the air volume of the outside air 101 sent from the outside air fan 51 to the first space 11 based on the indoor differential pressure measurement result by the differential pressure gauge 71. The control device 10 also controls the indoor differential pressure by changing the air volume of the first return air 106 through the first damper 31, thereby changing the air volume of the outside air 101 sent to the first space 11. The control device 10 also controls the indoor differential pressure by changing the air volume of the second air-fuel mixture 103 as supply air, thereby changing the air volume of the outside air 101 sent to the first space 11.

[0029] <Hardware configuration of the control device 10> FIG. 2 is a diagram showing an example of the hardware configuration of the control device 10 that constitutes the air conditioning management system 1 of FIG. The control device 10 has a control unit 111, a memory 112, a storage unit 113, a communication unit 114, an operation unit 115, and a display unit 116. These units are connected to each other via a data bus, an address bus, a PCI (Peripheral Component Interconnect) bus, etc.

[0030] The control unit 111 is a processor that controls the functions of the control device 10 through the execution of various software such as an OS (operating system) and application software. The control unit 111 is configured, for example, by a CPU (Central Processing Unit). The memory 112 is a storage area that stores various software and data used for executing the software, and is used as a work area for calculations. The memory 112 is configured, for example, by a RAM (Random Access Memory).

[0031] The storage unit 113 is a storage area that stores input data for various software programs, output data from various software programs, etc. The storage unit 113 is configured with, for example, an HDD (Hard Disk Drive), an SSD (Solid State Drive), a semiconductor memory, etc. that are used to store programs, various setting data, etc. The storage unit 113 is provided with a database that stores various information.

[0032] The communication unit 114 transmits and receives various types of information via the network 90. ​​The operation unit 115 is composed of, for example, a keyboard, a mouse, mechanical buttons, and switches, and accepts input operations. The operation unit 115 also includes a touch sensor that forms a touch panel integrally with the display unit 116. The display unit 116 is composed of, for example, a liquid crystal display or an organic EL (Electro Luminescence) display used to display information, and displays image and text data, etc. The display unit 116 displays a user interface, etc.

[0033] <Functional configuration of the control unit 111 of the control device 10> FIG. 3 is a diagram showing an example of the functional configuration of the control unit 111 of the control device 10 having the hardware configuration of FIG. In the control unit 111 of the control device 10, an acquisition unit 121, a management unit 122, a flow rate control unit 123, a determination unit 124, an air volume control unit 125, an air supply control unit 126, and a differential pressure control unit 127 function.

[0034] The acquisition unit 121 acquires various types of information. For example, the acquisition unit 121 acquires the state of the opening degree of the cold water flow path 23 by the solenoid valve of the cold water flow rate adjustment valve 24. Also, for example, the acquisition unit 121 acquires the measurement result of the indoor differential pressure by the differential pressure gauge 71.

[0035] The management unit 122 manages various types of information. For example, the management unit 122 stores and manages various types of information acquired by the acquisition unit 121 in a database in the storage unit 113 (see FIG. 2). For example, the management unit 122 stores and manages the state of the opening degree of the chilled water flow path 23 by the solenoid valve of the chilled water flow rate adjustment valve 24 acquired by the acquisition unit 121 in a database. Furthermore, for example, the management unit 122 stores and manages the measurement result of the indoor differential pressure by the differential pressure gauge 71 acquired by the acquisition unit 121 in a database.

[0036] The flow rate control unit 123 controls the flow rate of the chilled water flowing through the chilled water flow path 23 using the chilled water flow rate adjustment valve 24 provided in the chilled water flow path 23. Specifically, the flow rate control unit 123 transmits control information to the chilled water flow rate adjustment valve 24 to control the flow rate of the chilled water in accordance with the load in the air-conditioned space 200.

[0037] The determination unit 124 determines the air volumes of the first return air 106 and the second return air 107 according to the state of control of the flow rate of chilled water by the chilled water flow rate adjustment valve 24. This determination includes determining the ratio between the air volumes of the first return air 106 and the second return air 107. The determination unit 124 determines the air volumes of the first return air 106 and the second return air 107 according to the state of the opening of the chilled water flow path 23 by the solenoid valve of the chilled water flow rate adjustment valve 24. The determination unit 124 determines the air volumes of the first return air 106 and the second return air 107 in predetermined time units or in real time.

[0038] The air volume control unit 125 controls the first damper 31 provided in the return air flow path 15 to control the air volume of the first return air 106 flowing through the return air flow path 15 in accordance with the content determined by the determination unit 124. Specifically, the air volume control unit 125 transmits control information to the first damper 31 to control the air volume of the first return air 106. Furthermore, the air volume control unit 125 controls the second damper 32 provided in the bypass flow path 18 to control the air volume of the second return air 107 flowing through the bypass flow path 18 in accordance with the content determined by the determination unit 124. Specifically, the air volume control unit 125 transmits control information to the second damper 32 to control the air volume of the second return air 107.

[0039] The supply air control unit 126 controls the air volume of the second mixture 103 sent out as supply air from the supply air fan 53 towards the air conditioned space 200, in accordance with the determined air volumes of the first return air 106 and second return air 107. Specifically, the supply air control unit 126 transmits control information to the inverter 54, which controls the drive of the supply air fan 53, for controlling the air volume of the second mixture 103 sent out as supply air towards the air conditioned space 200.

[0040] The differential pressure control unit 127 controls the indoor differential pressure based on the measurement result of the indoor differential pressure by the differential pressure gauge 71. Specifically, for example, the differential pressure control unit 127 transmits control information to the inverter 52, which controls the drive of the outdoor air fan 51, for controlling the indoor differential pressure by changing the air volume of the outdoor air 101 sent into the first space 11. Furthermore, for example, the differential pressure control unit 127 transmits control information to the first damper 31, for controlling the indoor differential pressure by changing the air volume of the first return air 106. Furthermore, for example, the differential pressure control unit 127 transmits control information to the inverter 54, which controls the drive of the supply air fan 53, for controlling the indoor differential pressure by changing the air volume of the second air-fuel mixture 103 as supply air.

[0041] <Processing flow> (Processing flow of the control device 10) FIG. 4 is a flowchart showing an example of the flow of processing by the control device 10. The control device 10 controls the chilled water flow rate adjustment valve 24 to control the flow rate of chilled water circulating through the chilled water flow path 23 in accordance with the load in the air-conditioned space 200 (step 401). When the control device 10 acquires the state of the opening degree of the chilled water flow path 23, which is determined by the solenoid valve, from the chilled water flow rate adjustment valve 24 (YES in step 402), the control device 10 determines the air volumes of the first return air 106 and the second return air 107 in accordance with the state of the opening degree of the chilled water flow path 23 (step 403). On the other hand, when the state of the opening degree of the chilled water flow path 23 has not been acquired (NO in step 402), the control device 10 repeats the determination process of step 402.

[0042] The control device 10 controls the air volume of the second air-fuel mixture 103 as supply air sent from the air supply fan 53 to the air-conditioned space 200 in accordance with the determined air volumes of the first return air 106 and second return air 107 (step 404). When the control device 10 acquires the measured indoor differential pressure in the air-conditioned space 200 (YES in step 405), it controls the indoor differential pressure by changing the air volume of the outside air 101 sent into the first space 11 in accordance with the magnitude of the indoor differential pressure (step 406). The control device 10 then returns to the processing of step 401. On the other hand, if the indoor differential pressure in the air-conditioned space 200 has not been acquired (NO in step 405), the control device 10 repeats the determination processing of step 405.

[0043] <Other embodiments> Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment. Furthermore, the effects of the present invention are not limited to those described in the above-described embodiment. For example, the overall configuration of the air conditioning management system 1 shown in FIG. 1 and the hardware configuration of the control device 10 shown in FIG. 2 are merely examples for achieving the object of the present invention, and are not particularly limited.

[0044] 3 is merely an example for achieving the object of the present invention, and is not particularly limited. In other words, it is sufficient for the air conditioning management system 1 of FIG. 1 to have the function of being able to execute the above-described processing as a whole, and the hardware configuration and functional configuration used to realize this function are not limited to the above-described example.

[0045] 4 is merely an example and is not particularly limited. The steps do not necessarily have to be performed in chronological order, but may be performed in parallel or individually.

[0046] Furthermore, in the above-described embodiment, the outdoor air 101 from outside is taken into the air conditioning management system 1 by the outdoor air fan 51, but the present invention is not limited to this configuration and may be configured without the outdoor air fan 51. In this case, the outdoor air 101 from outside is taken into the air conditioning management system 1 by operating the supply air fan 53.

[0047] To summarize the above, the air conditioning management system 1 of the present invention only needs to have the following configuration, and can take on a variety of different embodiments. That is, the air conditioning management system 1 includes a return air flow path 15 for circulating return air 105 from an air-conditioned space 200 to be air-conditioned, a first space 11 to which first return air 106, which is at least a part of the return air 105, and outside air 101 from the outside are sent, a cold water flow path 23 for circulating cold water for cooling a first mixture 102, which is a mixture of the first return air 106 and the outside air 101 in the first space 11, by a cooling coil 22, a cold water flow rate adjustment valve 24 for controlling the flow rate of cold water in the cold water flow path 23 in accordance with the load in the air-conditioned space 200, a second space 12 to which the first mixture 102 is sent after passing through the cooling coil 22 and further passing through a heating coil 25 that heats the first mixture 102, a bypass flow path 18 that branches off from the return air flow path 15 and connects the return air flow path 15 to the second space 12, and a branch point 16 from which the bypass flow path 18 branches off from the return air flow path 15. a first damper 31 provided on the first space 11 side and controlling the air volume of the first return air 106; a second damper 32 provided in the bypass flow path 18 and controlling the air volume of the second return air 107 that flows through the bypass flow path 18 out of the return air 105; an air supply fan 53 that sends the second mixture 103, which is a mixture of the first mixture 102 and the second return air 107 in the second space 12, to the air-conditioned space 200 as supply air; The air conditioning management system is characterized by having a determination unit 124 of the control device 10 that determines the air volume of the first return air 106 and the air volume of the second return air 107 depending on the control status of the flow rate of the chilled water being supplied, and an air supply control unit 126 of the control device 10 that controls the air volume of the second mixture 103 that is sent out as supply air from the air supply fan 53 to the air-conditioned space 200 in accordance with the determined air volumes of the first return air 106 and the second return air 107.

[0048] As a result, a series of processes are performed, including control of the flow rate of the chilled water flow path 23, determination of the air volume of the return air flow path 15 and the air volume of the bypass flow path 18, and control of the air volume of the supply air, in accordance with the load in the air-conditioned space 200. As a result, it is possible to respond to load fluctuations in the air-conditioned space 200, thereby achieving energy savings.

[0049] Here, the cold water flow rate control valve 24 controls the flow rate of the cold water by controlling an adjustment valve (e.g., a solenoid valve) provided in the cold water flow path 23 that can adjust the opening degree of the cold water flow path 23, and the determination unit 124 of the control device 10 may be characterized in that it determines the air volume of the first return air 106 and the air volume of the second return air 107 depending on the opening degree of the cold water flow path 23 caused by the adjustment valve of the cold water flow rate control valve 24. As a result, a series of processes are performed, including control of the adjustment valve of the chilled water flow path 23, determination of the air volume of the return air flow path 15 and the air volume of the bypass flow path 18, and control of the air volume of the supply air, depending on the load in the air-conditioned space 200. As a result, it is possible to respond to load fluctuations in the air-conditioned space 200.

[0050] The determination unit 124 of the control device 10 may be characterized in that it determines the air volume of the first return air 106 and the air volume of the second return air 107 in predetermined time units or in real time. As a result, the air volume of the first return air 106 flowing through the return air flow path 15 and the air volume of the second return air 107 flowing through the bypass flow path 18 are determined in predetermined time units or in real time. As a result, it is possible to respond to the different load fluctuations in each air-conditioned space 200 and to the needs of users.

[0051] The control device 10 may further have a differential pressure control unit 127 that controls the indoor differential pressure by changing the volume of outside air 101 sent into the first space 11 in accordance with the indoor differential pressure, which is the difference in air pressure between the air-conditioned space 200 and the outside, measured separately by a differential pressure meter 71. This allows the indoor differential pressure in the air-conditioned space 200 to be controlled by changing the volume of outside air 101 sent into the first space 11, so that the indoor pressure in the air-conditioned space 200 can be kept constant or within a predetermined range.

[0052] The control device 10 may also be characterized by further having an outdoor air fan 51 that sends outdoor air 101 into the first space 11, and the differential pressure control unit 127 of the control device 10 controlling the indoor differential pressure by changing the volume of outdoor air 101 sent from the outdoor air fan 51 to the first space 11. As a result, the indoor differential pressure in the air-conditioned space 200 is controlled by changing the volume of outdoor air 101 sent into the first space 11 by the outdoor air fan 51, so that the indoor pressure in the air-conditioned space 200 can be kept constant or within a predetermined range.

[0053] In addition, the differential pressure control unit 127 of the control device 10 may be characterized by controlling the indoor differential pressure by changing the air volume of the first return air 106 in the first damper 31, and as a result, changing the air volume of the outside air 101 sent into the first space 11. This changes the air volume of the first return air 106, which in turn changes the air volume of the outside air 101 sent into the first space 11, thereby controlling the indoor differential pressure in the air-conditioned space 200. As a result, the indoor pressure in the air-conditioned space 200 can be kept constant or within a predetermined range.

[0054] In addition, the differential pressure control unit 127 of the control device 10 may be characterized by controlling the indoor differential pressure by changing the air volume of the second mixture 103 as air supply to the air supply control unit 126 of the control device 10, and as a result, changing the air volume of the outside air 101 sent into the first space 11. This changes the volume of the second air-fuel mixture 103 supplied as supply air, which in turn changes the volume of the outside air 101 sent into the first space 11, thereby controlling the indoor differential pressure in the air-conditioned space 200. As a result, the room pressure in the air-conditioned space 200 can be kept constant or within a predetermined range.

[0055] The air conditioning control method of the present invention can be implemented in a variety of different ways, as long as it has the following configuration. That is, the air conditioning management method in the air conditioning management system 1 includes circulating return air 105 from an air-conditioned space 200 to be air-conditioned through a return air flow path 15, sending first return air 106, which is at least a part of the return air 105, and outside air 101 from the outside, into a first space 11, circulating cold water through a cold water flow path 23 to cool a first mixture 102, which is a mixture of the first return air 106 and the outside air 101 in the first space 11, using a cooling coil 22, controlling the flow rate of the cold water in the cold water flow path 23 according to the load in the air-conditioned space 200, sending the first mixture 102, which has passed through the cooling coil 22 and further passed through a heating coil 25 that heats the first mixture 102, into a second space 12, connecting the return air flow path 15 and the second space 12 through a bypass flow path 18 branched from the return air flow path 15, and This is an air conditioning management method characterized by controlling the air volume of the first return air 106 using a first damper 31 provided on the first space 11 side of the branch point 16 where the flow path 18 branches, controlling the air volume of the second return air 107 of the return air 105 circulating through the bypass flow path 18 using a second damper 32 provided in the bypass flow path 18, sending the second mixture 103, which is a mixture of the first mixture 102 and the second return air 107 in the second space 12, to the air-conditioned space 200 as supply air by an air supply fan 53, determining the air volumes of the first return air 106 and the second return air 107 depending on the control status of the flow rate of the cold water circulating through the cold water flow path 23, and controlling the air volume of the second mixture 103 sent from the air supply fan 53 to the air-conditioned space 200 as supply air in accordance with the determined air volumes of the first return air 106 and the second return air 107. [Explanation of symbols]

[0056] 1...air conditioning control system, 10...control device, 11...first space, 12...second space, 15...return air flow path, 16...branch point, 18...bypass flow path, 21...filter, 22...cooling coil, 23...chilled water flow path, 24...chilled water flow control valve, 25...heating coil, 26...humidifier, 31...first damper, 32...second damper, 41, 42, 43, 44...air volume sensor, 51...outdoor air fan, 52, 54, 56...inverter, 53...supply Air fan, 55...exhaust fan, 61, 62, 63...temperature sensors, 71...differential pressure gauge, 101...outside air, 102...first mixture, 103...second mixture, 104...exhaust air, 105...return air, 106...first return air, 107...second return air, 111...control unit, 121...acquisition unit, 122...management unit, 123...flow rate control unit, 124...determination unit, 125...air volume control unit, 126...air supply control unit, 127...differential pressure control unit, 90...network

Claims

1. a return air flow path that circulates return air from an air-conditioned space that is an air-conditioning target; A first space into which first return air, which is at least a part of the return air, and outside air from the outside are sent; a cold water flow path through which cold water is circulated to cool a first mixture obtained by mixing the first return air and the outside air in the first space using a cooling coil; a flow rate control means for controlling the flow rate of the chilled water in the chilled water flow path in accordance with a load in the space to be air-conditioned; a second space into which the first air-fuel mixture is sent after passing through the cooling coil and further passing through a heating coil that heats the first air-fuel mixture; a bypass flow path branching from the return air flow path and connecting the return air flow path to the second space; a first air volume control means provided on the first space side of a branch point where the bypass flow path branches off from the return air flow path, and controlling an air volume of the first return air; A second air volume control means is provided in the bypass flow path and controls the air volume of second return air flowing through the bypass flow path among the return air. a supply air fan that sends a second mixture obtained by mixing the first mixture and the second return air in the second space to the air-conditioned space as supply air; an air volume determination means for determining the air volume of the first return air and the air volume of the second return air according to the state of control of the flow rate of the chilled water by the flow rate control means; an air supply control means for controlling the volume of the supply air sent from the air supply fan to the air-conditioned space in accordance with the determined volume of the first return air and the volume of the second return air; An air conditioning control system comprising:

2. the flow rate control means controls the flow rate of the cold water by controlling an adjustment valve provided in the cold water flow path and capable of adjusting an opening degree of the cold water flow path; The air volume determination means determines the air volume of the first return air and the air volume of the second return air according to the opening degree of the cold water flow path by the adjustment valve, The air conditioning management system according to claim 1 .

3. The airflow rate determination means determines the airflow rate of the first return air and the airflow rate of the second return air in a predetermined time unit or in real time. The air conditioning management system according to claim 1 .

4. The air conditioning system further comprises a differential pressure control means for controlling an indoor differential pressure, which is a difference in air pressure between the outside and the space to be air-conditioned, by changing the amount of outside air sent into the first space in accordance with the indoor differential pressure, which is a difference in air pressure between the outside and the space to be air-conditioned, which is measured separately. The air conditioning management system according to claim 1 .

5. an outside air fan that sends the outside air into the first space; The differential pressure control means controls the indoor differential pressure by changing the volume of the outside air sent from the outside air fan to the first space. The air conditioning management system according to claim 4.

6. The differential pressure control means controls the indoor differential pressure by causing the first air volume control means to change the air volume of the first return air, thereby changing the air volume of the outside air sent into the first space. The air conditioning management system according to claim 4.

7. The differential pressure control means controls the indoor differential pressure by causing the supply air control means to change the volume of the supply air, thereby changing the volume of the outside air sent into the first space. The air conditioning management system according to claim 4.

8. The return air from the space to be air-conditioned is circulated through the return air flow path. A first return air, which is at least a part of the return air, and outside air from the outside are sent into the first space; circulating cold water through a cold water flow path for cooling a first mixture obtained by mixing the first return air and the outside air in the first space with a cooling coil; controlling the flow rate of the chilled water in the chilled water flow path in accordance with a load in the air-conditioned space; The first air-fuel mixture is passed through the cooling coil and further passed through a heating coil that heats the first air-fuel mixture, and then the first air-fuel mixture is sent to a second space; a bypass flow path branched from the return air flow path connects the return air flow path to the second space; A first air volume control means is provided on the first space side of a branch point where the bypass flow path branches off from the return air flow path, and the air volume of the first return air is controlled, a second air volume control means provided in the bypass flow path controls the air volume of the second return air flowing through the bypass flow path; a second mixture obtained by mixing the first mixture and the second return air in the second space is sent to the air-conditioned space as supply air by an air supply fan; Determine the air volume of the first return air and the air volume of the second return air according to the state of control of the flow rate of the chilled water, controlling the volume of the supply air sent from the supply air fan to the air-conditioned space in accordance with the determined volume of the first return air and the volume of the second return air; An air conditioning management method characterized by the above.

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