Air conditioning control system and air conditioning control method

Abstract

An air conditioning control system capable of responding to load fluctuations in a space to be air conditioned is provided. [Solution] The control device 10 that constitutes the air conditioning management system 1 determines the air volume of the first return air 106 and the air volume of the second return air 107 depending on the status of control of the cold water flow rate by the cold water flow rate control valve 24, and controls the air volume of the second mixture 103 sent as supply air from the supply air 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.

Description

[Technical field]

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

[0002] A technology is known in which dampers capable of changing the airflow rate are provided 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 sides of the cooling coil and heating coil, and the operation of the supply air fan that sends out supply air to the space to be air-conditioned is controlled according to the ratio of the airflow rate of the return air flow path to the airflow rate of 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, so 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 outside air from outside are sent, a cold water flow path for circulating cold water for cooling a first mixture obtained by mixing the first return air and the outside air in the first space with a cooling coil, a flow rate control means for controlling a 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 which has passed through the cooling coil and further passed through a heating coil for heating the first mixture, a bypass flow path branching off from the return air flow path and communicating the return air flow path with the second space, and a bypass flow path branching off from a branch point where the bypass flow path branches off from the return air flow path. and a first air volume control means provided in the bypass flow path 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 a second return air circulating through the bypass flow path among the return air; a supply air fan for sending out a 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 air volume of the first return air and the air volume of the second return air depending on the control status of the flow rate of the cold water by the flow control means; and a supply air control means for controlling the volume of the supply air sent out from the supply air 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. 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 cold water by controlling an adjustment valve provided in the cold water flow path capable of adjusting the opening degree of the cold 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 degree of the cold 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 a predetermined time unit 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, which is measured separately, by changing the volume of the 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 to 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 causing the supply air control means to change the volume of the supply air, and as a result, changing the volume of the outside air sent into the first space. The invention described in claim 8 is a system for circulating return air from an air-conditioned space to be air-conditioned through a return air flow path, feeding first return air, which is at least a part of the return air, and outside 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 outside air in the first space with a cooling coil, controlling a flow rate of the cold water in the cold water flow path according to a load in the air-conditioned space, feeding the first mixture that 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, and an air conditioning management method comprising: controlling the 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 volume of a 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 a control status of the flow rate of the chilled water; and controlling the 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. Effect of the Invention

[0007] According to the present invention, it is possible to provide an air conditioning management system capable of responding to load fluctuations in a space to be air conditioned. [Brief description 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 an embodiment of the present invention is applied; [Diagram 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. [Diagram 3] 3 is a diagram illustrating an example of a 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 process flow of a control device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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 the present 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 information.

[0010] The air conditioning management system 1 has an outdoor air fan 51 that takes in air present outside (hereinafter referred to as "outside air") 101. The outdoor air fan 51 is a fan whose driving is controlled by an inverter 52 based on control information from the control device 10. The inverter 52 controls the driving of the outdoor air fan 51 by adjusting the frequency of the outdoor 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 the 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 to 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 return air 105 from a space to be air-conditioned (hereinafter referred to as the "air-conditioned space") 200, is also sent to 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 flowing through the return air flow path 15 and the outside air 101 taken in by the outside air fan 51 are mixed together and sent to 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 Fig. 1, the air-conditioned space 200 is drawn small for the sake of convenience in order 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 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 mixture 102 from which foreign matter has been removed by passing through the filter 21, and a cold water passage 23 that circulates cold water for cooling the cooling coil 22. The cooling coil 22 cools the first mixture 102 by exchanging heat between the first mixture 102 that has passed through the filter 21 and the cold water that circulates through the cold water passage 23. The cold water passage 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 by the humidifier 26 as necessary is sent. Here, the air sent to the second space 12 is not limited to the first mixture 102. The 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 that has flowed through the bypass flow path 18 and the first mixture 102 are sent to the second space 12. As a result, the 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 out the second air-fuel mixture 103 as supply air toward the air-conditioned space 200. The supply air fan 53 is a fan whose driving is controlled by an inverter 54 based on control information from the control device 10. The inverter 54 controls the driving 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 supply air fan 53 has its volume measured by the air volume sensor 42 and its temperature measured by the temperature sensor 62. The volume of air 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 supply air fan 53 towards 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 temperature, and a differential pressure gauge 71 that measures an 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 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 in 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 driving is controlled by an inverter 56 based on control information from the control device 10. The inverter 56 controls the driving 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 the first return air 106 through the return air flow path 15 as it is and is sent to the first space 11. In addition, at least a part of the return air 105 flows as the second return air 107 through the bypass flow path 18 and is sent to the second space 12.

[0024] An air flow sensor 43 for measuring the air flow rate of the first return air 106 flowing through the return air flow path 15 is provided downstream of the branch point 16 on the first space 11 side of the return air flow path 15. Further downstream, a first damper 31 is provided as a first air flow rate control means for controlling the air flow rate of the first return air 106 flowing through the return air flow path 15. The first damper 31 controls the air flow rate of the first return air 106 by opening and closing at an arbitrary opening degree by 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 passage 18 branched off from the return air flow passage 15 at the branch point 16, for measuring the volume of the second return air 107 flowing through the bypass flow passage 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 passage 18. The second damper 32 controls the volume of the second return air 107 by opening and closing at an arbitrary opening degree by 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 the control device 10 functions as an air volume determination means, it determines the air volume of the first return air 106 and the air volume of the second return air 107 according to the state of control of the flow rate of the cold water by the cold water flow rate adjustment valve 24. In this case, the control device 10 determines the air volume of the first return air 106 and the air volume of the second return air 107 according to 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. Here, the timing at which the control device 10 determines the air volume of the first return air 106 and the air volume of the second return air 107 is not particularly limited. For example, the control device 10 determines the air volume of the first return air 106 and the air volume of the second return air 107 in a predetermined time unit or in real time.

[0027] Also, for example, when the control device 10 functions as an air supply control means, it controls the 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 volume of the first return air 106 and the volume of the second return air 107.

[0028] Furthermore, for example, when the control device 10 functions as a differential pressure control means, it controls the indoor differential pressure by changing the air volume of the outdoor air 101 sent from the outdoor 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 to the first damper 31, thereby changing the air volume of the outdoor 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 outdoor 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 a hardware configuration of the control device 10 constituting 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 composed of, for example, 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 working area for calculations. The memory 112 is composed of, for example, a RAM (Random Access Memory).

[0031] The storage unit 113 is a storage area that stores input data for various software programs and output data from various software programs. The storage unit 113 is configured with, for example, a hard disk drive (HDD), a solid state drive (SSD), a semiconductor memory, etc. that are used to store programs and various setting data. The storage unit 113 is provided with a database that stores various information.

[0032] The communication unit 114 transmits and receives various 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 constitutes 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. A user interface and the like are displayed on the display unit 116.

[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. In addition, 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 cold water flow path 23 by the solenoid valve of the cold water flow rate adjustment valve 24 acquired by the acquisition unit 121 in a database. In addition, 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 cold water flowing through the cold water flow path 23 using the cold water flow rate adjustment valve 24 provided in the cold water flow path 23. Specifically, the flow rate control unit 123 transmits control information to the cold water flow rate adjustment valve 24 for controlling the flow rate of cold water in accordance with the load in the air conditioned space 200.

[0037] The determination unit 124 determines the air volume of the first return air 106 and the air volume of 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 volume of the first return air 106 and the air volume of the second return air 107. The determination unit 124 determines the air volume of the first return air 106 and the air volume of the second return air 107 according to 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. The determination unit 124 determines the air volume of the first return air 106 and the air volume of the second return air 107 in a predetermined time unit or in real time.

[0038] The air volume control unit 125 causes 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 for controlling the air volume of the first return air 106 to the first damper 31. Also, the air volume control unit 125 causes 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 for controlling the air volume of the second return air 107 to the second damper 32.

[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 the 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 that 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. Also, 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. Also, for example, the differential pressure control unit 127 transmits control information to the inverter 54 that 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 cold water flow rate adjustment valve 24 to control the flow rate of cold water flowing through the cold 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 cold water flow path 23 by the solenoid valve from the cold water flow rate adjustment valve 24 (YES in step 402), it determines the air volume of the first return air 106 and the air volume of the second return air 107 in accordance with the state of the opening degree of the cold water flow path 23 (step 403). On the other hand, when the state of the opening degree of the cold water flow path 23 has not been acquired (NO in step 402), the control device 10 repeats the judgment process of step 402.

[0042] The control device 10 controls the air volume of the second mixture 103 as supply air sent from the supply air 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 (step 404). When the control device 10 acquires the measured indoor differential pressure in the air conditioned space 200 (YES in step 405), the control device 10 controls the indoor differential pressure by changing the air volume of the outside air 101 sent to the first space 11 in accordance with the magnitude of the indoor differential pressure (step 406). Then, the control device 10 returns to the processing of step 401. On the other hand, when 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 present embodiment. Furthermore, the effects of the present invention are not limited to those described in the above-described present 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] In addition, the functional configuration of the control device 10 shown in Fig. 3 is merely an example for achieving the object of the present invention, and is not particularly limited. In other words, it is sufficient that the air conditioning management system 1 in Fig. 1 has a function capable of executing the above-mentioned processing as a whole, and the hardware configuration and functional configuration used to realize this function are not limited to the above-mentioned example.

[0045] In addition, the order of the process steps shown in the flowchart of Fig. 4 is merely an example and is not particularly limited. The process is not limited to the process performed in chronological order according to the illustrated order of steps, and may be performed in parallel or individually without necessarily being performed in chronological order.

[0046] In addition, in the above 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 the operation of the supply air fan 53.

[0047] To summarise the above, the air conditioning management system 1 of the present invention only needs to have the following configuration, and can take 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 that is the target of air conditioning, a first space 11 into which a first return air 106 that 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 formed by mixing the first return air 106 and the outside air 101 in the first space 11 with 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 into which the first mixture 102 that has passed through the cooling coil 22 and further passed through a heating coil 25 that heats the first mixture 102 is sent, a bypass flow path 18 that branches off from the return air flow path 15 and communicates between the return air flow path 15 and the second space 12, and a bypass flow path 24 that is connected to the return air flow path 15 via a branch point 16 where 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 passage 18 and controlling the air volume of the second return air 107 circulating through the bypass flow passage 18 out of the return air 105; a supply air fan 53 that sends out 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 cold 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 sent from the 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.

[0048] This allows a series of processes to be performed, including control of the flow rate of the cold water flow path 23, determination of the air volume of the return air flow path 15 and the bypass flow path 18, and control of the supply air volume, 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 and capable of adjusting 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 by the adjustment valve of the cold water flow rate control valve 24. Thus, the control of the adjustment valve of the cold water flow path 23, the determination of the air volume of the return air flow path 15 and the bypass flow path 18, and the control of the supply air volume are performed as a series of processes according to 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 a predetermined time unit or in real time. Thereby, the air volume of the first return air 106 flowing through the return air flow passage 15 and the air volume of the second return air 107 flowing through the bypass flow passage 18 are determined in predetermined time units or in real time. As a result, it becomes possible to respond to the different load fluctuation modes for each air-conditioned space 200 and to the needs of users.

[0051] The control device 10 may further include 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 gauge 71. As a result, the indoor pressure difference in the air conditioned space 200 is 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 further include 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 may be characterized in that it controls the indoor differential pressure by changing the volume of the 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 to 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 in that it controls the indoor differential pressure by changing the volume of the first return air 106 in the first damper 31, and as a result, changing the volume of the outside air 101 sent to the first space 11. This changes the volume of the first return air 106, which in turn changes the volume of the outside air 101 sent into the first space 11, thereby controlling the indoor pressure difference 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 in that it controls the indoor differential pressure by changing the volume of the second mixture 103 as supply air to the supply air control unit 126 of the control device 10, and as a result, changing the volume of the outside air 101 sent to the first space 11. This changes the volume of the second air-fuel mixture 103 as supply air, and as a result, 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] Furthermore, the air conditioning control method of the present invention may take a variety of forms 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 a 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 for cooling a first mixture 102 obtained by mixing the first return air 106 and the outside air 101 in the first space 11 with a cooling coil 22, 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, sending the first mixture 102 that 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, communicating the return air flow path 15 and the second space 12 through a bypass flow path 18 branched off 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 by 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 flowing through the bypass flow path 18 by 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 cold water flowing 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 flow sensor, 51...outdoor air fan, 52, 54, 56...inverter, 53...supply Air fan, 55...exhaust fan, 61, 62, 63...temperature sensor, 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 for circulating return air from an air-conditioned space that is an air-conditioned target; A first space into which a 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 for circulating cold water for cooling a first mixture obtained by mixing the first return air and the outside air in the first space by a cooling coil; a flow rate control means for controlling a flow rate of the cold water in the cold water flow path in accordance with a load in the space to be air-conditioned; a second space into which the first mixture is sent that has passed through the cooling coil and further passed through a heating coil for heating the first 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 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 controls the air volume of the first return air; A second air volume control means is provided in the bypass flow path and controls an air volume of a second return air flowing through the bypass flow path among the return air; a supply air fan that sends out a second mixture obtained by mixing the first mixture and the second return air in the second space as supply air to the air-conditioned space; An air volume determination means for determining an air volume of the first return air and an air volume of the second return air according to a state of control of the flow rate of the chilled water by the flow rate control means; 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; An outside air control means for controlling the volume of the outside air sent into the first space; A differential pressure control means for controlling an indoor differential pressure, which is a difference in air pressure between the air conditioned space and the outside; having An air conditioning management system characterized in that each of the controls of the first return air volume, the second return air volume, the supply air volume, the outdoor air volume, and the indoor differential pressure is performed as a series of processes based on control information from a control device functioning as the air volume determination means, the supply air control means, the outdoor air control means, and the differential pressure control means.

2. the flow rate control means controls a 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 regulating valve, The air conditioning management system according to claim 1 .

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

4. Further, an outside air fan is provided to send the outside air into the first space, The differential pressure control means controls the indoor differential pressure by changing the amount of air flow of the outdoor air sent from the outdoor air fan to the first space. The air conditioning management system according to claim 1 .

5. 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 to the first space. The air conditioning management system according to claim 1 .

6. 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 1 .

7. 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 a first space; A first mixture obtained by mixing the first return air and the outside air in the first space is cooled by a cooling coil by circulating cold water through a cold water flow path; controlling a flow rate of the cold water in the cold water flow path in accordance with a load in the space to be air-conditioned; The first mixture is passed through the cooling coil and further through a heating coil for heating the first mixture, and the first mixture is sent to a second space; A bypass flow path branched from the return air flow path communicates the return air flow path with 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 an 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; Controlling the volume of the outside air sent into the first space; Controlling an indoor differential pressure, which is a difference in air pressure between the air conditioned space and the outside; The control of the first return air volume, the second return air volume, the supply air volume, the outside air volume, and the indoor differential pressure is performed as a series of processes based on control information from a control device. An air conditioning management method comprising:

Images