Central air conditioning system and control method thereof

Abstract

The embodiment of the present application provides a central air conditioning system and a control method thereof. The central air conditioning system 20 has a central air conditioning host 22a and a terminal device 23. The central air conditioning host 22a has a second communication terminal 222 and a controller 223a. The second communication terminal 222 is connected with the terminal device 23, and the controller 223a is connected with the second communication terminal 222. Therefore, the control cabinet is not needed in the central air conditioning system, so that the design and installation of the control cabinet are avoided, and the cost of design, manufacturing, installation and maintenance caused by the control cabinet is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electromechanical technology. BACKGROUND

[0002] Currently, a conventional central air conditioning system needs a control cabinet to realize joint control. The control cabinet aims to process system logic functions, control various terminal devices, and upload data to an operation center.

[0003] Figure 1 is a schematic diagram of an existing central air conditioning system. As shown in Figure 1 , the central air conditioning system 10 can have a central controller 11, a control cabinet 12, a central air conditioning host 13, terminal devices 14, and sensing devices 15, etc. The terminal devices 14 can be, for example, refrigeration pumps, cooling pumps, cooling towers, and the like.

[0004] In the existing central air conditioning system, the central air conditioning host 13, the terminal devices 14, and the sensing devices 15 are all connected to the control cabinet 12. The data uploaded by the central air conditioning host 13, the terminal devices 14, and the sensing devices 15 is aggregated by the controller in the control cabinet 12, and the controller in the control cabinet 12 sends control signals to the central air conditioning host 13 and the terminal devices 14.

[0005] Thus, in the machine room where the central air conditioning system is located, the control cabinet 12 performs monitoring and control of all devices in the entire machine room.

[0006] It should be noted that the above introduction to the technical background is only to facilitate a clear and complete description of the technical solutions of the present application, and to facilitate the understanding of those skilled in the art. The above technical solutions cannot be considered as known to those skilled in the art merely because they are described in the background section of the present application. SUMMARY

[0007] The present inventors believe that Figure 1 The central air conditioning system 10 shown in needs to be provided with the control cabinet 12, thus requiring more manpower and resources, and having a high cost, for example: different control cabinets need to be designed for each machine room to realize on-site data collection and monitoring and control of various devices, thus the design cost of the control cabinet is high; during the design stage, the control cabinet needs to be designed according to the actual needs of the central air conditioning system to determine the number of controllers and the distribution of points in the control cabinet, etc. If the machine room is large, multiple control cabinets need to be designed; in addition, during the installation and operation stage, not only the control cabinet needs to be installed and debugged on site, but also the maintenance cost is high.

[0008] Embodiments of the present application provide a central air conditioning system and a control method thereof, in which a terminal device is connected with a central air conditioning host, so that the terminal device can communicate or be controlled via the central air conditioning host, and the central air conditioning system does not need to be provided with a control cabinet, thus avoiding the design and installation of the control cabinet and greatly reducing the design, manufacturing, installation and maintenance costs caused by the control cabinet.

[0009] According to a first aspect of embodiments of the present application, a central air conditioning system is provided, which has a central controller, a central air conditioning host and a terminal device, the central air conditioning host has a first communication terminal, a second communication terminal and a controller, the first communication terminal is connected with the central controller, the second communication terminal is connected with the terminal device, and the controller is connected with the first communication terminal and the second communication terminal, and the terminal device communicates with the central controller through the second communication terminal, the controller and the first communication terminal.

[0010] According to a second aspect of embodiments of the present application, a control method of a central air conditioning system is provided, the central air conditioning system has at least two central air conditioning hosts, and the method comprises:

[0011] calculating the sum of refrigerating capacity or heating capacity of the at least two central air conditioning hosts according to the current operating parameters of each central air conditioning host; and

[0012] setting new operating parameters of each central air conditioning host, with the refrigerating capacity or heating capacity sum changing within a predetermined range and the total power of the at least two central air conditioning hosts being the minimum, according to the optimal performance working point of each central air conditioning host.

[0013] The present application has the beneficial effect that the central air conditioning system does not need to be provided with a control cabinet, thus avoiding the design and installation of the control cabinet and greatly reducing the design, manufacturing, installation and maintenance costs caused by the control cabinet.

[0014] Specific embodiments of the present application are disclosed in detail in the following description and accompanying drawings, indicating the ways in which the principles of the present application can be employed. It should be understood that the embodiments of the present application are not limited in scope so as to encompass many changes, modifications and equivalents within the spirit and scope of the appended claims. Embodiments of the present application include many alternatives, modifications and equivalents.

[0015] Features described and / or illustrated with respect to one implementation can be used in the same or similar way in one or more other implementations, combined with features of other implementations, or substituted for features of other implementations.

[0016] It should be emphasized that the term "comprises / comprising" when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0018] Figure 1 is a schematic diagram of an existing central air conditioning system;

[0019] Figure 2 is a schematic diagram of a central air conditioning system of a first aspect of embodiments of the application;

[0020] Figure 3 is another schematic diagram of a central air conditioning system of the first aspect of embodiments of the application;

[0021] Figure 4 is a schematic diagram of relevant operations of a central air conditioning system of the first aspect of embodiments of the application when performing energy saving control;

[0022] Figure 5 is a schematic diagram of a control method of a central air conditioning system of a second aspect of embodiments of the application;

[0023] Figure 6 is another schematic diagram of a control method of a central air conditioning system of the second aspect of embodiments of the application. DETAILED DESCRIPTION

[0024] The foregoing and other features of the present application will become more apparent from the following description and accompanying drawings. In the description and drawings, like numbers in different drawings represent the same or similar elements. Described in detail are specific embodiments of the present application, which illustrate the principles of the present application, and indicate some of the ways the principles of the present application can be employed. It will be appreciated that the application is not limited to the embodiments described, but rather the application includes all modifications, variations, and equivalents that fall within the scope of the appended claims.

[0025] In the embodiments of the present application, the terms "first", "second" and the like are used to distinguish different elements, but do not indicate the spatial arrangement or the time sequence of the elements, and the elements should not be limited by these terms. The term "and / or" includes any one and all combinations of the associated listed terms. The terms "comprise", "include", "have" and the like mean the presence of the stated features, elements, elements or components, but do not exclude the presence or addition of one or more other features, elements, elements or components.

[0026] In the embodiments of the present application, the singular form "a", "an" and the like includes the plural form, and should be broadly understood as "one" or "a kind of", rather than limited to the meaning of "one"; in addition, the term "the" should be understood to include both singular and plural forms, unless the context clearly indicates otherwise. In addition, the term "according to" should be understood as "at least partially according to", and the term "based on" should be understood as "at least partially based on", unless the context clearly indicates otherwise.

[0027] First aspect of the embodiments

[0028] The first aspect of the embodiments of the present application provides a central air conditioning system.

[0029] Figure 2 is a schematic diagram of the central air conditioning system of the first aspect of the embodiments of the present application, as Figure 2 The central air conditioning system 20 has a central controller 21, a central air conditioning host 22 and a terminal device 23.

[0030] As shown in Figure 2 The central air conditioning host 22 has a first communication terminal 221, a second communication terminal 222 and a controller 223.

[0031] In at least one embodiment, the first communication terminal 221 is connected with the central controller 21, the second communication terminal 222 is connected with the terminal device 23, and the controller 223 is connected with the first communication terminal 221 and the second communication terminal 222. The terminal device 23 communicates with the central controller 21 through the second communication terminal 222, the controller 223 and the first communication terminal 221.

[0032] According to the first aspect of the embodiments of the present application, the communication terminal of the terminal device is connected with the central air conditioning host, so that the terminal device can communicate with the central controller via the central air conditioning host, and the control cabinet is not required to be arranged in the central air conditioning system. Therefore, the design and installation of the control cabinet are avoided, and the cost of design, manufacture, installation and maintenance caused by the control cabinet is greatly reduced.

[0033] In at least one embodiment, the central controller 21 can monitor other components of the central air conditioning system 20. For example, the central controller 21 can acquire operating parameter data of the central air conditioning unit 22 and the terminal devices 23, and send control signals to control the operation of the central air conditioning unit 22 and the terminal devices 23. The central controller 21 can be, for example, an industrial personal computer (IPC), which may have a human machine interface (HMI).

[0034] In at least one embodiment, such as Figure 2 As shown, the terminal device 23 can be, for example, at least one of a cooling tower 231, a cooling pump 232, and a chilled water pump 233. This application is not limited to this; the terminal device 23 can also be other devices.

[0035] In at least one embodiment, the central air conditioning unit 22 may have cooling and / or heating functions. When cooling, the central air conditioning unit 22 may be a chiller unit; when heating, it may be a heat pump unit. In addition to the first communication terminal 221, the second communication terminal 222, and the controller 223, the central air conditioning unit 22 may also have components for processing the refrigerant to achieve cooling and / or heating functions. These components include, for example, a compressor, a condenser, an evaporator, and a four-way valve. For a description of the working principles of these components, please refer to relevant technologies; this application embodiment will not provide further details.

[0036] In at least one embodiment, the connection between the first communication terminal 221 of the central air conditioning unit 22 and the central controller 21 can be a wired connection or a wireless connection. The connection between the second communication terminal 222 of the central air conditioning unit 22 and the terminal device 23 can also be a wired connection or a wireless connection. A wired connection can be, for example, via a communication cable, while a wireless connection can be, for example, based on Bluetooth or Wi-Fi technology. In the case of a wireless connection, the communication terminal may include a communication module with a wireless signal transceiver unit.

[0037] In a first aspect of the embodiments of this application, the first communication terminal 221 and the second communication terminal 222 can receive and transmit signals. The controller 223 can perform signal processing such as parsing on the signals received through the first communication terminal 221 and the second communication terminal 222 to obtain the signal to be transmitted. The signal to be transmitted can be transmitted through the second communication terminal 222 and the first communication terminal 221.

[0038] In at least one embodiment, the central air conditioner host 22 can receive the control signal sent by the central controller 21 through the first communication terminal 221, the controller 223 can parse the first control signal for controlling the terminal device 23 from the control signal received by the first communication terminal 221, and the second communication terminal 222 sends the first control signal parsed by the controller 223 to the terminal device 23. Wherein, the first control signal can have marking information pointing to the second communication terminal, for example, the address information of the second communication terminal 222.

[0039] For example, each second communication terminal 222 of the central air conditioner host 22 is provided with a corresponding address, the control signal sent by the central controller 21 can have address information and control information corresponding to the address information, and the controller 223 parses the address information contained in the control signal to point to the address of a certain second communication terminal 222, and the control information corresponding to the address information is taken as the first control signal, and the first control signal is sent from the second communication terminal 222.

[0040] In the case that the terminal device 23 receives the first control signal through the second communication terminal 222, the terminal device 23 can adjust the operation of the terminal device 23 according to the first control signal.

[0041] In at least one embodiment, the controller 223 can also parse the second control signal for controlling the central air conditioner host 22 from the control signal received by the first communication terminal 221, and the controller 223 can control the operation of the central air conditioner host 22 according to the second control signal. Wherein, the second control signal can have marking information pointing to the central air conditioner host 22, for example, the address information of the central air conditioner host 22. Thus, the central controller 21 can control the central air conditioner host.

[0042] For example, the central air conditioner host 22 is provided with a corresponding address, the control signal sent by the central controller 21 can have address information and control information corresponding to the address information, the controller 223 parses the address information contained in the control signal to point to the address of the central air conditioner host 22, and the control information corresponding to the address information is taken as the second control signal, and the controller 223 controls the central air conditioner host 22 according to the second control signal, for example, increasing or decreasing the current supplied to the compressor.

[0043] In at least one embodiment, the central air conditioner host 22 can receive the feedback signal sent by the terminal device 23 through the second communication terminal 222, and the controller 223 can parse the first feedback signal fed back to the central controller 21 from the feedback signal received by the second communication terminal 222, and the first communication terminal 221 sends the first feedback signal parsed by the controller 223 to the central controller 21. Wherein, the first feedback signal can have marking information pointing to the central controller 21, for example, the address information of the central controller 21.

[0044] For example, the feedback signal sent by the terminal device 23 can have address information and feedback information corresponding to the address information, and the controller 223 parses the address information contained in the feedback signal to point to the address of the central controller 21, and takes the feedback information corresponding to the address information as the first feedback signal, and sends the first feedback signal to the central controller 21 from the first communication terminal 221.

[0045] In addition, in at least one embodiment, the operating parameters of the central air conditioner host 22 can be sent to the central controller 21 through the first communication terminal 221.

[0046] In the case that the central controller 21 receives the first feedback signal and / or the operating parameters of the central air conditioner host 22 through the first communication terminal 221, it can monitor the operating state of the terminal device 23 and / or the central air conditioner host 22 according to the first feedback signal and / or the operating parameters of the central air conditioner host 22, and generate a control signal for controlling the terminal device 23 and / or the central air conditioner host 22 according to the first feedback signal and / or the operating parameters of the central air conditioner host 22.

[0047] In at least one embodiment, the controller 223 can also parse the second feedback signal fed back to the central air conditioner host 22 from the feedback signal received by the first communication terminal 221, and the controller 223 can control the operation of the central air conditioner host 22 and / or the terminal device 23 according to the second feedback signal. Wherein, the second feedback signal can have marking information pointing to the central air conditioner host 22, for example, the address information of the central air conditioner host 22. Thus, the central air conditioner host 22 can monitor and control the terminal device 23, especially when the central controller 21 fails, the central air conditioner host 22 and the terminal device 23 can communicate through the second communication terminal 222, that is, the terminal device 23 sends the second feedback signal to the central air conditioner host 22, the central air conditioner host 22 (for example, the controller 223) generates a third control signal for controlling the terminal device 23 according to the second feedback signal and sends it to the terminal device 23 through the second communication terminal 222, thereby enabling the central air conditioning system to operate stably and reliably.

[0048] The feedback information contained in the second feedback signal may be the same as or different from the feedback information contained in the first feedback signal, and the control information contained in the third control signal generated by the controller 223 based on the second feedback signal may be the same as or different from the control information contained in the first control signal. For example... Figure 2 As shown, in at least one embodiment, the central air conditioning system 20 may further include an operating status detection device 24. The operating status detection device 24 is used to detect the operating status data of the central air conditioning system 20. The operating status detection device 24 is connected to the central controller 21 and sends the detected operating status data to the central controller 21.

[0049] In at least one embodiment, the operating status detection device 24 may be, for example, a sensor. Operating status data may be, for example, the inlet and outlet water temperatures of the chilled pipes, and / or the inlet and outlet water temperatures of the cooling pipes, and / or the flow rate of the refrigerant, etc.

[0050] like Figure 2 As shown, in at least one embodiment, the central air conditioning system 20 also has a host performance calculator 25, which can be connected to the central controller 21. Thus, the central controller 21 can send the received operating parameters of the central air conditioning host 22 to the host performance calculator 25, and the host performance calculator 25 can send the load setting signal to the central controller 21. The central controller 21 generates a control signal based on the load setting signal and sends it to the central air conditioning host 22.

[0051] For example, the central air conditioning system 20 may have one central air conditioning unit 22. The unit performance calculator 25 can calculate the cooling or heating capacity of the central air conditioning unit 22 based on its current operating parameters. Then, based on the optimal operating point of the central air conditioning unit 22 at that cooling or heating capacity, and with the goal of ensuring that the variation range of the cooling or heating capacity does not exceed a predetermined range and minimizing the power consumption of the central air conditioning unit 22, new operating parameters are set for the central air conditioning unit 22. These new operating parameters are sent to the central controller 21 as a load setting signal. The "variation range of cooling or heating capacity not exceeding a predetermined range" can, for example, mean that the fluctuation range of the cooling or heating capacity is within ±10% of the calculated cooling or heating capacity of the central air conditioning unit 22.

[0052] For example, the central air conditioning system 20 can have at least two central air conditioning hosts 22, each of which is connected to the central controller 21. The host performance calculator 25 can calculate the total cooling or heating capacity of the central air conditioning hosts 22 according to the current operating parameters of the central air conditioning hosts 22, and set new operating parameters of the central air conditioning hosts 22 according to the optimal performance working points of the central air conditioning hosts 22, with the goal of the total cooling or heating capacity within a predetermined range and the total power of the central air conditioning hosts 22 being the minimum, and the new operating parameters being sent to the central controller 21 as load setting signals. The total cooling or heating capacity within a predetermined range can mean, for example, that the floating range of the total cooling or heating capacity is within ±10% of the calculated total cooling or heating capacity of the central air conditioning hosts 22.

[0053] In an embodiment, the host performance calculator 25 can extract multiple performance curves of each central air conditioning host 22 near the current operating parameters, and find the most suitable performance curve of the central air conditioning host 22 from the multiple performance curves corresponding to the central air conditioning host 22, wherein the performance curve is a curve of the cooling or heating capacity of the central air conditioning host 22 versus the load, and the operating parameters corresponding to the optimal performance working point of the performance curve are taken as the new operating parameters of the central air conditioning host 22. In this way, each central air conditioning host 22 works at the optimal performance working point, and the total cooling or heating capacity of the multiple central air conditioning hosts 22 is within a predetermined range, and the total power of the multiple central air conditioning hosts 22 is the minimum, thereby achieving the energy-saving effect of the central air conditioning system. The total cooling or heating capacity within a predetermined range can mean, for example, that the floating range of the total cooling or heating capacity is within ±10% of the calculated total cooling or heating capacity of the multiple central air conditioning hosts 22. The host performance calculator 25 can select the performance curve with the goal of the total cooling or heating capacity of the multiple central air conditioning hosts 22 being unchanged and the total power of the multiple central air conditioning hosts 22 being the minimum when selecting the most suitable performance curve of each central air conditioning host 22.

[0054] Figure 4 is a schematic diagram of the related operations of the central air conditioning system of the first aspect of the embodiments of the present application when performing energy-saving control. As shown in Figure 4 , the related operations can include:

[0055] Operation 301, according to the system load, adjust the load of each central air conditioning host 22. For example, when the system load increases, if the current cooling capacity or heating capacity of the central air conditioning host 22 is insufficient to match the current load, the central air conditioning host 22 is added, and when the system load decreases, if the current cooling capacity or heating capacity of the central air conditioning host 22 is excessive, the central air conditioning host 22 is gradually reduced.

[0056] Operation 302, the central air conditioning system 20 runs stably for a predetermined time, for example, the central air conditioning system 20 runs to the target water temperature working condition and stably runs for 15 minutes.

[0057] Operation 303, the central controller 21 sends the current running parameters of the plurality of central air conditioning hosts 22 to the host performance calculator 25.

[0058] Operation 304, the host performance calculator 25 calculates the sum of the cooling capacity or heating capacity of the plurality of central air conditioning hosts 22 according to the current running parameters of each central air conditioning host 22.

[0059] Operation 305, the host performance calculator 25 calculates the new running parameters of each central air conditioning host 22, so as to adjust the load of the central air conditioning host 22, which can include the running current of the host. For example, the host performance calculator 25 sets the new running parameters of each central air conditioning host 22 according to the optimal performance working point of each central air conditioning host 22, with the variation range of the sum of the cooling capacity or heating capacity not exceeding a predetermined range and the sum of the power of at least two central air conditioning hosts being the smallest as the target.

[0060] Operation 306, the host performance calculator 25 sends the calculation result of the new running parameters of each central air conditioning host 22 to the central controller 21, and the central controller 21 generates a control signal and sends the control signal to each central air conditioning host 22.

[0061] After operation 306 is completed, it can return to operation 301, and the running parameters of each central air conditioning host 22 are continuously adjusted until the actual running parameters reach the most energy-saving running parameters of the system.

[0062] In the existing central air conditioning system, the running of the terminal equipment such as the cooling pump and the cooling tower is usually controlled according to the difference between the current system demand load and the preset load, so as to realize the energy saving of the central air conditioning system. For example, the frequency control and the number control of the cooling pump are performed, so that the cooling pump always runs near the optimal efficiency point, or the frequency control and the number control of the cooling tower are performed, so as to reduce the power consumption of the cooling tower itself, thereby reducing the power consumption of the central air conditioning system and realizing the system energy saving.

[0063] However, the central air conditioning unit itself is the most energy-intensive component in the entire central air conditioning system. Therefore, energy-saving control of terminal equipment such as cooling pumps and cooling towers is not the optimal energy-saving solution. Furthermore, existing energy-saving solutions require determining empirical parameters for adjustment based on the specific project conditions and on-site assessments by professionals before implementation, making implementation quite challenging.

[0064] In the embodiments of this application, the central air conditioning system 20 uses the central air conditioning unit as the main object of energy-saving control, thus enabling simple and effective energy-saving control of the central air conditioning system.

[0065] Furthermore, it should be noted that the host performance calculator 25 in this embodiment is not limited to being installed in the central air conditioning system 20. The host performance calculator 25 can be installed in a central air conditioning system with other system structures. For example, the host performance calculator 25 can be installed in... Figure 1 In the central air conditioning system 10 shown, and connected to the central controller 11, the energy-saving control method of the host performance calculator 25 can be the same.

[0066] In at least one embodiment, Figure 2 The central controller 21 and the host performance calculator 25 shown can be independent hardware circuits, or the same hardware circuit can perform the functions of the two units. For example, the same hardware circuit can implement the functions of the central controller 21 and the host performance calculator 25 by running different software modules.

[0067] Figure 3 This is another schematic diagram of a central air conditioning system according to the first aspect of the embodiments of this application. Figure 3 The central air conditioning system 20a shown is Figure 2 Compared to the central air conditioning system 20 shown, the difference is that in the central air conditioning unit 22a of the central air conditioning system 20a, the controller 223a integrates the functions of the controller 223 in the central air conditioning unit 22 of the central air conditioning system 20 and the functions of the central controller 21.

[0068] Below, on Figure 3 China is different Figure 2 The components are described in the accompanying drawings, and the same parts have the same reference numerals, so the description is omitted.

[0069] like Figure 3As shown, the central air conditioning system 20a has a central air conditioning host 22a and a terminal device 23. The central air conditioning host 22a has a second communication terminal 222 and a controller 223a, the second communication terminal 222 is connected with the terminal device 23, and the controller 223a is connected with the second communication terminal 222. The terminal device 23 communicates with the controller 223a through the second communication terminal 222.

[0070] In at least one embodiment, the controller 223a can send a first control signal for controlling the terminal device 23 to the terminal device 23 through the second communication terminal 222, and in addition, the controller 223a can also receive a first feedback signal sent by the terminal device 23 to the controller 223a from the terminal device 23 through the second communication terminal 222. The meanings of the first feedback signal and the first control signal can be referred to the foregoing description of the central air conditioning system 20.

[0071] In addition, the controller 223a can also control the operation of the central air conditioning host 22a, for example, control the current of the compressor in the central air conditioning host 22a.

[0072] In at least one embodiment, the controller 223a can also record the operation parameters of the central air conditioning host 22a.

[0073] As shown, Figure 3 The central air conditioning system 20a can also have an operation state detection device 24. The operation state detection device 24 can be connected with the central air conditioning host 22a through a third terminal 224 arranged on the central air conditioning host 22a. The connection can be wired or wireless.

[0074] As shown, Figure 3 The central air conditioning system 20a can also have a host performance calculator 25. The host performance calculator 25 can be connected with the central air conditioning host 22a through a fourth terminal 225 arranged on the central air conditioning host 22a. The connection can be wired or wireless.

[0075] In at least one embodiment, Figure 3 The controller 223a and the host performance calculator 25 shown can be independent hardware circuits, or the functions of the two units can be completed by the same hardware circuit, for example, the same hardware circuit implements the functions of the controller 223a and the host performance calculator 25 by running different software modules. In the case of completing the functions of the controller 223a and the host performance calculator 25 by the same hardware circuit, the central air conditioning host 22a can not have the fourth terminal 225.

[0076] According to a first aspect of the embodiments of the present application, the terminal device is connected with the communication terminal of the central air conditioning host, so that the terminal device can be controlled and communicated via the central air conditioning host, and the control cabinet is not needed in the central air conditioning system, thus the design and installation of the control cabinet are avoided, and the cost of design, manufacture, installation and maintenance caused by the control cabinet is greatly reduced. In addition, the host performance calculator in the first aspect of the embodiments of the present application takes the central air conditioning host as the main object of energy-saving control, and thus the energy-saving control of the central air conditioning system can be simply and effectively realized.

[0077] Second aspect of the embodiments

[0078] The second aspect of the embodiments of the present application provides a control method of a central air conditioning system, which corresponds to the host performance calculator 25 in the first aspect of the embodiments.

[0079] Figure 5 is a schematic diagram of the control method of the central air conditioning system in the second aspect of the embodiments of the present application, and the central air conditioning system has one central air conditioning host. As shown in Figure 5 , the method 400 includes the following operations:

[0080] Operation 401, calculating the refrigerating capacity or the heating capacity of the central air conditioning host according to the current operating parameters of the central air conditioning host of the central air conditioning system; and

[0081] Operation 402, setting new operating parameters of the central air conditioning host according to the optimal performance working point of the central air conditioning host under the refrigerating capacity or the heating capacity, with the variation range of the refrigerating capacity or the heating capacity not exceeding a predetermined range and the power of the central air conditioning host being the minimum as the target.

[0082] Figure 6 is another schematic diagram of the control method of the central air conditioning system in the second aspect of the embodiments of the present application, and the central air conditioning system has at least two central air conditioning hosts. As shown in Figure 6 , the method 500 includes the following operations:

[0083] Operation 501, calculating the sum of the refrigerating capacities or the heating capacities of the at least two central air conditioning hosts according to the current operating parameters of each of the central air conditioning hosts; and

[0084] Operation 502, setting new operating parameters of each of the central air conditioning hosts according to the optimal performance working point of each of the central air conditioning hosts, with the variation range of the sum of the refrigerating capacities or the heating capacities not exceeding a predetermined range and the sum of the powers of the at least two central air conditioning hosts being the minimum as the target.

[0085] For a description of each operation in method 400 and method 500, please refer to the description of host performance calculator 25 in the first aspect of the embodiments.

[0086] According to a second aspect of the embodiments of this application, the central air conditioning unit is used as the main object of energy-saving control, thus enabling simple and effective energy-saving control of the central air conditioning system.

[0087] This application also provides a computer-readable program, wherein when the program is executed in a host performance calculator or air conditioning system, the program causes the host performance calculator or central air conditioning system to perform the control method of the central air conditioning system described in the second aspect of the embodiment.

[0088] This application also provides a storage medium storing a computer-readable program, wherein the storage medium stores the computer-readable program, and the computer-readable program causes a host performance calculator or air conditioning system to perform the control method of the central air conditioning system described in the second aspect of the embodiment.

[0089] The apparatus described in conjunction with the embodiments of this application may be directly embodied in hardware, a software module executed by a processor, or a combination of both. For example, Figure 2 , Figure 3 One or more and / or combinations of one or more functional block diagrams shown can correspond to either software modules or hardware modules in a computer program flow. These software modules can correspond to the respective operations shown in the first aspect of the embodiments. These hardware modules can be implemented, for example, using a field-programmable gate array (FPGA).

[0090] The software module can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. A storage medium can be coupled to the processor, enabling the processor to read information from and write information to the storage medium; or the storage medium can be an integral part of the processor. The processor and storage medium can reside in an ASIC. The software module can be stored in the memory of a mobile terminal or in a memory card that can be inserted into the mobile terminal. For example, if the electronic device uses a high-capacity MEGA-SIM card or a high-capacity flash memory device, the software module can be stored in the MEGA-SIM card or the high-capacity flash memory device.

[0091] against Figure 2 , Figure 3One or more of the described functional block diagrams and / or one or more combinations of functional block diagrams can be implemented as a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof for performing the functions described herein. Figure 2 , Figure 3 One or more of the described functional block diagrams and / or combinations of one or more functional block diagrams can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.

[0092] The present application has been described above with reference to specific embodiments. However, those skilled in the art should understand that these descriptions are exemplary and not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on its principles, and these modifications and variations are also within the scope of the present application.

Claims

1. A central air conditioning system having a central controller, a central air conditioning host, and a terminal device, characterized in that: the central air conditioning host has a first communication terminal, a second communication terminal, and a controller, the first communication terminal is connected with the central controller, the second communication terminal is connected with the terminal device, the controller is connected with the first communication terminal and the second communication terminal, the terminal device communicates with the central controller through the second communication terminal, the controller, and the first communication terminal, the central air conditioning system further has a host performance calculator, wherein the host performance calculator calculates the refrigerating capacity or the heating capacity of the central air conditioning host according to the current operating parameters of the central air conditioning host, and sets new operating parameters of the central air conditioning host aiming at the variation range of the refrigerating capacity or the heating capacity not exceeding a predetermined range and the power of the central air conditioning host being the minimum, according to the optimal performance working point of the central air conditioning host under the refrigerating capacity or the heating capacity. 2.The central air conditioning system according to claim 1, characterized in that: the central air conditioning host receives a control signal sent by the central controller through the first communication terminal, the controller parses a first control signal for controlling the terminal device from the control signal, and the second communication terminal sends the first control signal to the terminal device. 3.The central air conditioning system according to claim 2, characterized in that: the controller further parses a second control signal for controlling the central air conditioning host from the control signal, and the controller controls the operation of the central air conditioning host according to the second control signal. 4.The central air conditioning system according to claim 1, characterized in that: the operating parameters of the central air conditioning host are sent to the central controller through the first communication terminal. 5.The central air conditioning system according to claim 1, characterized in that: the central air conditioning host receives a feedback signal sent by the terminal device through the second communication terminal, the controller parses a first feedback signal fed back to the central controller from the feedback signal, and the first communication terminal sends the first feedback signal to the central controller. 6.The central air conditioning system according to claim 5, characterized in that: the controller further parses a second feedback signal fed back to the central air conditioning host from the feedback signal, and the controller controls the operation of the central air conditioning host and / or the terminal device according to the second feedback signal. 7.The central air conditioning system according to any one of claims 1 to 6, characterized in that: the central air conditioning system further has an operating state detection device, the operating state detection device is used for detecting operating state data of the central air conditioning system, and the operating state detection device sends the operating state data to the central controller or the controller. 8.The central air conditioning system according to any one of claims 1 to 6, characterized in that: the central air conditioning system has at least two central air conditioning hosts. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The host performance calculator calculates the total of the refrigerating or heating capacity of the at least two central air conditioning hosts according to the current operating parameters of each of the central air conditioning hosts, and sets new operating parameters for each of the central air conditioning hosts according to the optimal performance operating point of each of the central air conditioning hosts, with the variation range of the total of the refrigerating or heating capacity not exceeding a predetermined range and the total power of the at least two central air conditioning hosts being the minimum as the target. 9.A central air conditioning system having central air conditioning hosts and terminal devices, characterized in that: the central air conditioning host has a second communication terminal and a controller, the second communication terminal is connected with the terminal device, the controller is connected with the second communication terminal, the terminal device communicates with the controller through the second communication terminal, the controller sends a first control signal for controlling the terminal device to the terminal device through the second communication terminal, the controller receives a first feedback signal sent by the terminal device to the controller through the second communication terminal, the central air conditioning system further has a host performance calculator, wherein the host performance calculator calculates the refrigerating or heating capacity of the central air conditioning host according to the current operating parameters of the central air conditioning host, and sets new operating parameters for the central air conditioning host according to the optimal performance operating point of the central air conditioning host at the refrigerating or heating capacity, with the variation range of the refrigerating or heating capacity not exceeding a predetermined range and the power of the central air conditioning host being the minimum as the target. 10.The central air conditioning system of claim 9, characterized in that: the controller records the operating parameters of the central air conditioning host. 11.The central air conditioning system of any one of claims 9-10, characterized in that: the central air conditioning system further has an operating state detection device, the operating state detection device is used to detect operating state data of the central air conditioning system, the operating state detection device sends the operating state data to the central controller or the controller. 12.The central air conditioning system of any one of claims 9-10, characterized in that: the central air conditioning system has at least two central air conditioning hosts, the host performance calculator calculates the total of the refrigerating or heating capacity of the at least two central air conditioning hosts according to the current operating parameters of each of the central air conditioning hosts, and sets new operating parameters for each of the central air conditioning hosts according to the optimal performance operating point of each of the central air conditioning hosts, with the variation range of the total of the refrigerating or heating capacity not exceeding a predetermined range and the total power of the at least two central air conditioning hosts being the minimum as the target.

13. A control method of a central air conditioning system for controlling the central air conditioning system according to any one of claims 1 to 7, 9 to 11, characterized by The method comprises: calculating the refrigerating or heating capacity of the central air conditioning host according to the current operating parameters of the central air conditioning host of the central air conditioning system; and According to the optimal performance working point of the central air conditioner host under the refrigerating or heating capacity, new operation parameters of the central air conditioner host are set, with the variation range of the refrigerating or heating capacity not exceeding a predetermined range and the power of the central air conditioner host being minimum.

14. A control method of a central air conditioning system for controlling the central air conditioning system according to claim 8 or 12, the central air conditioning system having at least two central air conditioning main units, characterized by, The method comprises: According to the current operation parameters of each central air conditioner host, the sum of the refrigerating or heating capacities of the at least two central air conditioner hosts is calculated; and According to the optimal performance working point of each central air conditioner host, new operation parameters of each central air conditioner host are set, with the variation range of the sum of the refrigerating or heating capacities not exceeding a predetermined range and the sum of the powers of the at least two central air conditioner hosts being minimum.

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