Control method, device and related equipment of distribution system with variable distribution mode

Abstract

The embodiment of the present application provides a control method, device and related equipment for a distribution system with a variable distribution mode, which belongs to the field of heat exchanger cluster control technology. The method includes: obtaining multiple candidate operating conditions under different numbers of heat exchangers turned on, the speed of the cold side water pump and the speed of the hot side water pump. Obtain the theoretical heat exchange load, power consumption to heat exchange ratio and theoretical outlet water temperature of the heat exchanger cluster for each candidate operating condition under each candidate distribution mode, and obtain the target demand data in the target area. Filter out the candidate operating conditions with the lowest power consumption to heat exchange ratio under each candidate distribution mode, which meet the target demand data, and as the selected operating conditions. Extract the target operating condition with the lowest power consumption to heat exchange ratio from the multiple selected operating conditions, and control the distribution system according to the target distribution mode and the target operating condition. Under the same heat exchange conditions, if the power consumption to heat exchange ratio is the lowest, the heat exchange efficiency of the distribution system will be higher.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchanger cluster control, and in particular to a control method, device and related equipment for a distribution system with a variable distribution mode. Background Art

[0002] The transmission and distribution system can be a cooling system or a heating system. The transmission and distribution system includes a heat exchange substation, a cold side water pump and a hot side water pump. The heat exchange substation is a heat exchanger cluster composed of multiple heat exchangers connected in parallel. In the cooling system, the cold side water pump transports the low-temperature cold water produced by the energy station to the heat exchange substation through the pipeline network, and the hot side water pump transports the air conditioning return water on the user side to the heat exchange substation through the pipeline network, and heat exchange is performed in the heat exchange substation. In the heating system, the hot side water pump transports the high-temperature water produced by the thermal power plant or boiler room to the heat exchange substation through the pipeline network, and the cold side water pump transports the low-temperature water returned from the user side to the heat exchange substation through the pipeline network, and heat exchange is performed in the heat exchange substation.

[0003] During the design phase of the transmission and distribution system, the connection form (transmission and distribution method) of the pump groups on both sides of the heat exchanger cluster was determined, which was fixed as one machine to one pump or multiple machines to multiple pumps. Due to the limitations of the transmission and distribution method locked in the design phase, the control method of the transmission and distribution system can only seek the best operation strategy under the inherent transmission and distribution method. When the transmission and distribution system is completed, if the transmission and distribution method needs to be changed, the transmission and distribution system can only be dismantled and rebuilt or modified. The conventional operation strategy is mainly addition and subtraction control, that is, when the user's demand load increases or decreases, the operation and maintenance personnel meet the user's heat exchange needs by increasing or decreasing the number of heat exchangers and opening the corresponding water pumps on both sides of the heat exchanger at full frequency, but this operation strategy is not the most energy-saving operation strategy. Therefore, how to make the transmission and distribution system more energy-efficient while meeting the user's demand load has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The main purpose of the embodiments of the present application is to propose a distribution system control method, device and related equipment with a variable distribution mode, aiming to make the distribution system more energy-efficient while meeting the user's demand load.

[0005] To achieve the above-mentioned purpose, a first aspect of an embodiment of the present application proposes a control method for a distribution system with a variable distribution mode, which is applied to a distribution system, wherein the distribution system includes multiple candidate distribution modes, the distribution system includes a heat exchanger cluster, a cold side water pump, and a hot side water pump, and the method includes:

[0006] Acquire multiple candidate operating conditions; wherein the multiple candidate operating conditions are operating conditions with different numbers of heat exchangers turned on, different speeds of the cold side water pump, and different speeds of the hot side water pump;

[0007] Obtaining heat exchange characteristic data of the heat exchanger cluster under each candidate operating condition under each candidate transmission and distribution mode; wherein the heat exchange characteristic data includes theoretical heat exchange load, power consumption heat exchange ratio and theoretical water outlet temperature;

[0008] Obtain target demand data in the target area;

[0009] Filtering the selected operating condition of each candidate transmission and distribution mode from the candidate operating conditions according to the theoretical heat exchange load, the theoretical outlet water temperature, the speed of the cold side water pump, the speed of the hot side water pump, the target demand data and the power consumption to heat exchange ratio; wherein the selected operating condition has the lowest power consumption to heat exchange ratio under the corresponding candidate transmission and distribution mode;

[0010] Extracting the target operating condition with the lowest power consumption to heat exchange ratio from the multiple selected operating conditions; wherein the candidate transmission and distribution mode corresponding to the target operating condition is defined as the target transmission and distribution mode;

[0011] The transmission and distribution system is controlled according to the target transmission and distribution mode and the target operating condition.

[0012] In some embodiments, the target demand data includes a required heat exchange load and an outlet water temperature limit value. After controlling the distribution system according to the target distribution mode and the target operating condition, the method further includes:

[0013] Obtaining the actual heat exchange load and actual outlet water temperature of the transmission and distribution system;

[0014] Comparing the actual heat exchange load with the required heat exchange load to obtain a first comparison result, and comparing the actual outlet water temperature with the outlet water temperature limit value to obtain a second comparison result, and splicing the first comparison result and the second comparison result to obtain a target comparison result;

[0015] Adjust the target demand data according to the target comparison result to obtain target update data;

[0016] Filtering the selected update operating condition of each candidate transmission and distribution mode from the candidate operating conditions according to the theoretical heat exchange load, the theoretical outlet water temperature, the speed of the cold side water pump, the speed of the hot side water pump, the target update data and the power consumption to heat exchange ratio; wherein the selected update operating condition has the lowest power consumption to heat exchange ratio under the corresponding candidate transmission and distribution mode;

[0017] Extracting the target update operating condition with the lowest power consumption and heat exchange ratio from the multiple selected update operating conditions; wherein the candidate transmission and distribution mode corresponding to the target update operating condition is defined as an update transmission and distribution mode;

[0018] The distribution system is controlled according to the updated distribution mode and the target updated operating condition.

[0019] In some embodiments, the transmission and distribution system is a cooling system or a heating system, and adjusting the target demand data according to the target comparison result to obtain target update data includes:

[0020] If the transmission and distribution system is the cooling system, and the target comparison result is characterized by the actual heat exchange load being less than the required heat exchange load, and / or the actual outlet water temperature being greater than the outlet water temperature limit value, adjusting the target demand data to obtain target update data;

[0021] If the transmission and distribution system is the heating system, and the target comparison result is characterized by the actual heat exchange load being less than the required heat exchange load, and / or the actual outlet water temperature being less than the outlet water temperature limit value, the target demand data is adjusted to obtain target update data.

[0022] In some embodiments, the transmission and distribution system is a cooling system or a heating system. After adjusting the target demand data according to the target comparison result to obtain target update data, the method further includes:

[0023] Obtaining a difference between the actual heat exchange load and the required heat exchange load to obtain a heat exchange difference, and obtaining a difference between the actual outlet water temperature and the outlet water temperature limit value to obtain a temperature difference;

[0024] If the transmission and distribution system is the cooling system, the rotation speed of the cold side water pump is adjusted according to the heat exchange difference or the temperature difference;

[0025] If the transmission and distribution system is the heating system, the rotation speed of the hot side water pump is adjusted according to the heat exchange difference or the temperature difference.

[0026] In some embodiments, obtaining the actual heat exchange load and the actual outlet water temperature of the distribution system includes:

[0027] Obtaining actual water inlet temperature, actual water outlet temperature and flow parameters of the distribution system;

[0028] The actual heat exchange load is obtained by performing heat calculation according to the preset specific heat capacity coefficient, the actual water inlet temperature, the actual water outlet temperature and the flow parameter.

[0029] In some embodiments, the transmission and distribution system is a cooling system or a heating system, the target demand data includes a required heat exchange load, a water outlet temperature limit value, and a water pump speed safety range, and the selected operating condition of each candidate transmission and distribution mode is selected from the candidate operating conditions according to the theoretical heat exchange load, the theoretical water outlet temperature, the speed of the cold side water pump, the speed of the hot side water pump, the target demand data, and the power consumption-heat exchange ratio, including:

[0030] If the transmission and distribution system is the cooling system, then under each of the candidate transmission and distribution modes, the candidate operating conditions are screened out, in which the theoretical heat exchange load is greater than or equal to the required heat exchange load, the theoretical outlet water temperature is less than or equal to the outlet water temperature limit value, the speed of the cold side water pump and the speed of the hot side water pump are within the water pump speed safety range, and the power consumption to heat exchange ratio is the lowest, to obtain a plurality of the selected operating conditions;

[0031] If the transmission and distribution system is the heating system, then under each of the candidate transmission and distribution modes, the candidate operating conditions in which the theoretical heat exchange load is greater than or equal to the required heat exchange load, the theoretical outlet water temperature is greater than or equal to the outlet water temperature limit value, the speed of the cold side water pump and the speed of the hot side water pump are within the water pump speed safety range, and the power consumption to heat exchange ratio is the lowest are screened out to obtain a plurality of selected operating conditions.

[0032] In some embodiments, the step of obtaining the heat exchange characteristic data of the heat exchanger cluster in each candidate operating condition under each candidate transmission and distribution mode includes:

[0033] Obtaining a pipe network flow model, a water pump model, and a heat exchanger model of the transmission and distribution system;

[0034] The heat exchange characteristic data of each candidate operating condition under each candidate transmission and distribution mode is solved according to the pipeline flow model, the water pump model and the heat exchanger model.

[0035] To achieve the above-mentioned purpose, a second aspect of an embodiment of the present application provides a distribution system control device with a variable distribution mode, which is applied to a distribution system, wherein the distribution system includes a plurality of candidate distribution modes, and the control device includes a heat exchanger cluster, a cold side water pump, a hot side water pump and a controller;

[0036] The controller comprises:

[0037] A first acquisition module is used to acquire a plurality of candidate operating conditions; wherein the plurality of candidate operating conditions are operating conditions under different numbers of heat exchangers turned on, different rotation speeds of the cold side water pump, and different rotation speeds of the hot side water pump;

[0038] The second acquisition module is used to obtain the heat exchange characteristic data of the heat exchanger cluster in each candidate operating condition under each candidate transmission and distribution mode; wherein the heat exchange characteristic data includes theoretical heat exchange load, power consumption heat exchange ratio and theoretical water outlet temperature;

[0039] The third acquisition module is used to acquire target demand data in the target area;

[0040] A screening module, for screening out a selected operating condition of each candidate transmission and distribution mode from the candidate operating conditions according to the theoretical heat exchange load, the theoretical outlet water temperature, the speed of the cold side water pump, the speed of the hot side water pump, the target demand data and the power consumption to heat exchange ratio; wherein the selected operating condition has the lowest power consumption to heat exchange ratio under the corresponding candidate transmission and distribution mode;

[0041] An extraction module is used to extract the target operating condition with the lowest power consumption and heat exchange ratio from the multiple selected operating conditions; wherein the candidate transmission and distribution mode corresponding to the target operating condition is defined as the target transmission and distribution mode;

[0042] A control module is used to control the distribution system according to the target distribution mode and the target working condition.

[0043] To achieve the above-mentioned purpose, the third aspect of an embodiment of the present application proposes an electronic device, which includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method described in the first aspect is implemented.

[0044] To achieve the above-mentioned purpose, the fourth aspect of an embodiment of the present application proposes a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method described in the first aspect is implemented.

[0045] The control method, device and related equipment of the distribution system with variable distribution mode proposed in the present application obtain multiple candidate operating conditions, which are operating conditions with different numbers of heat exchangers turned on, different speeds of cold-side water pumps and hot-side water pumps. The theoretical heat exchange load, power consumption to heat exchange ratio and theoretical outlet water temperature of the heat exchanger cluster of each candidate operating condition under each candidate distribution mode are obtained, and the target demand data in the target area are obtained. The candidate operating condition with the lowest power consumption to heat exchange ratio under each candidate distribution mode that meets the target demand data and has the lowest power consumption to heat exchange ratio is selected as the selected operating condition. The selected operating condition with the lowest power consumption to heat exchange ratio is extracted from the multiple selected operating conditions as the target operating condition, and the candidate distribution mode corresponding to the target operating condition is defined as the target distribution mode. The distribution system is controlled according to the target distribution mode and the target operating condition. The control method of the distribution system does not need to seek the best operation strategy under the existing distribution mode, change the distribution mode, or dismantle, rebuild or transform the distribution system. And the distribution system is controlled according to the target distribution mode and target operating conditions. Under the same heat exchange conditions, the power consumption and heat exchange ratio is the lowest, so it is more energy-saving and has higher heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a control system diagram of a distribution system with a variable distribution mode provided in an embodiment of the present application;

[0047] Figure 2 It is an optional flow chart of a method for controlling a distribution system with a variable distribution mode provided in an embodiment of the present application;

[0048] Figure 3 is a flow chart of a method for controlling a distribution system with a variable distribution mode provided by another embodiment of the present application;

[0049] Figure 4 yes Figure 3 Flow chart of step S301 in FIG.

[0050] Figure 5 yes Figure 3 Flow chart of step S303 in FIG.

[0051] Figure 6 is a flow chart of a method for controlling a distribution system with a variable distribution mode provided in a third embodiment of the present application;

[0052] Figure 7 yes Figure 2 Flow chart of step S204 in FIG.

[0053] Figure 8 yes Figure 2 Flow chart of step S202 in FIG.

[0054] Fig. 9 It is a characteristic dimension diagram of the plate of the plate heat exchanger provided in the embodiment of the present application;

[0055] Fig.10 is a schematic diagram of the structure of a control device for a distribution system provided in an embodiment of the present application;

[0056] Fig.11 It is a schematic diagram of the hardware structure of the electronic device provided in the embodiment of the present application. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0058] It should be noted that, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0060] First, some nouns involved in this application are analyzed:

[0061] Electricity consumption to heat exchange ratio: With reference to the electricity consumption to transferred cooling (or heating) ratio (EC(H)R), a standard air conditioning water system design rationality indicator in the national standard "Energy-saving Design Standard for Public Buildings" (GB 50189-2015), an indicator electricity consumption to heat exchange ratio for evaluating parallel heat exchanger clusters is proposed. The electricity consumption to heat exchange ratio (EEXR) is calculated by the following formula (1):

[0062] , (1)

[0063] in, Indicates The heat transfer capacity of each heat exchanger is represents the power of the jth water pump on the cold side of the heat exchanger, represents the power of the jth water pump on the hot side of the heat exchanger. The heat exchanger cluster is composed of It is composed of a heat exchanger. From formula (1), we can see that under the same heat exchange conditions, the smaller the water pump power consumption, the smaller the power consumption heat exchange ratio, and the corresponding operation strategy is more energy-saving.

[0064] The pump group connection form (distribution mode) on both sides of the heat exchanger cluster is determined in the design stage of the transmission and distribution system, which is fixed as one machine to one pump or multiple machines to multiple pumps. Subject to the limitation of the transmission and distribution mode locked in the design stage, the control mode of the transmission and distribution system can only seek the best operation strategy under the inherent transmission and distribution mode. When the transmission and distribution system is completed, if the transmission and distribution mode needs to be changed, the transmission and distribution system can only be dismantled, rebuilt or modified. The conventional operation strategy is mainly addition and subtraction control, that is, when the user's demand load increases or decreases, the operation and maintenance personnel meet the user's heat exchange needs by increasing or decreasing the number of heat exchangers and opening the corresponding water pumps on both sides of the heat exchanger at full frequency. For example, assuming that the heat exchange power of a heat exchanger is 20kW and the user's maximum demand power is 100kW, then the heat exchange substation usually sets 5 parallel heat exchangers to meet the user's extreme heat exchange demand of 100kW. However, as factors such as outdoor temperature change, the user's demand power is not constant. In the related art, when the user's heat exchange demand is only 40kW, the existing operating strategy is to start two heat exchangers and start the corresponding water pumps on both sides of the two heat exchangers at full frequency. However, this operating strategy only considers whether the heat exchange power meets the user's required power, and is not the most energy-saving operating strategy.

[0065] Based on this, the embodiments of the present application provide a control method, device and storage medium for a distribution system with a variable distribution mode, which aims to obtain the theoretical heat exchange load, power consumption to heat exchange ratio and theoretical outlet water temperature of the heat exchanger cluster for each candidate operating condition under each candidate distribution mode. Collect the target demand data of users in the target area, and screen out a plurality of selected operating conditions under each candidate distribution mode in which the theoretical heat exchange load and theoretical outlet water temperature meet the target demand data and the power consumption to heat exchange ratio is the lowest. Then, the selected operating condition with the lowest power consumption to heat exchange ratio is extracted from the plurality of selected operating conditions as the target operating condition; wherein, the candidate distribution mode corresponding to the target operating condition is defined as the target distribution mode, and the distribution system is controlled according to the target distribution mode and the target operating condition. Under the same heat exchange conditions, if the power consumption to heat exchange ratio is the lowest, the corresponding operating condition is the most energy-saving, and the screened target operating condition meets the target demand data required by the user and has the lowest power consumption to heat exchange ratio. Therefore, controlling the distribution system according to the target distribution mode and the target operating condition can be more energy-efficient.

[0066] The control method, device and related equipment of the distribution system with variable distribution mode provided in the embodiments of the present application are specifically explained through the following embodiments. First, the control method of the distribution system with variable distribution mode in the embodiments of the present application is described.

[0067] The embodiments of the present application can acquire and process relevant data based on artificial intelligence technology. Artificial Intelligence (AI) is the theory, method, technology and application system that uses digital computers or machines controlled by digital computers to simulate, extend and expand human intelligence, perceive the environment, acquire knowledge and use knowledge to obtain the best results.

[0068] AI basic technologies generally include sensors, dedicated AI chips, cloud computing, distributed storage, big data processing technology, operation / interaction systems, mechatronics, etc. AI software technologies mainly include computer vision technology, robotics technology, biometrics technology, speech processing technology, natural language processing technology, and machine learning / deep learning.

[0069] The control method of the distribution system with variable distribution mode provided in the embodiment of the present application can be applied to the terminal, can also be applied to the server side, and can also be software running in the terminal or the server side. In some embodiments, the terminal can be a smart phone, a tablet computer, a laptop computer, a desktop computer, etc.; the server side can be configured as an independent physical server, or a server cluster or distributed system composed of multiple physical servers, and can also be configured as a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms; the software can be an application of the control method of the distribution system with variable distribution mode, etc., but is not limited to the above forms.

[0070] The present application can be used in many general or special computer system environments or configurations. For example: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments including any of the above systems or devices, etc. The present application can be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application can also be practiced in distributed computing environments, in which tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules can be located in local and remote computer storage media including storage devices.

[0071] Figure 1 is a control system diagram of a distribution system with a variable distribution mode provided in an embodiment of the present application, such as Figure 1 As shown in the figure, ① represents the cold side water pump group, ②~④, ⑥~⑧ represent the distribution mode switching valve group, ⑤ represents the heat exchanger cluster, ⑨ represents the hot side water pump group, Indicates flow sensor, Represents temperature sensor, SCADA stands for Supervisory Control and Data Acquisition, SW stands for Ethernet switch, PLC stands for Programmable Logic Controller, VFD-1 is the pump inverter that controls the speed of the cold side water pump, and VFD-2 is the pump inverter that controls the speed of the hot side water pump. In practical applications, after SCADA selects the target operating conditions (operation strategies) that meet the target demand data and have the lowest power consumption and heat exchange ratio in the operation strategy database, it sends the operation strategy to the Ethernet switch SW, and then to the programmable logic controller PLC. After receiving the operation strategy, the programmable logic controller PLC controls the corresponding number of heat exchangers to start, and sends the corresponding water pump speed instructions to the water pump inverters VFD-1 and VFD-2. VFD-1 adjusts the speed of the cold side water pump by changing the power frequency of the cold side water pump, and VFD-2 adjusts the speed of the hot side water pump by changing the power frequency of the hot side water pump.

[0072] Specifically, when there are 5 heat exchangers in the heat exchanger cluster, there are 5 cold side water pumps and 5 hot side water pumps correspondingly, and the speed of each cold side water pump is consistent, and the speed of each hot side water pump is also consistent. The distribution mode of the distribution system of the present application includes 4 candidate distribution modes, namely, one machine to one pump on both sides, multiple machines to multiple pumps on both sides, one machine to one pump on the cold side and multiple machines to multiple pumps on the hot side, and multiple machines to multiple pumps on the cold side and one machine to one pump on the hot side. In the distribution system with one machine to one pump on both sides, one cold side water pump and one hot side water pump work for one heat exchanger. In the distribution system with multiple machines to multiple pumps on both sides, multiple cold side water pumps and multiple hot side water pumps work for multiple heat exchangers at the same time. The specific switching strategies are as follows:

[0073] If the candidate distribution mode is one machine to one pump on both sides, valve groups ②, ④, ⑥ and ⑧ are opened, and valve groups ③ and ⑦ are closed. If the candidate distribution mode is multiple machines to multiple pumps on both sides, valve groups ②, ④, ⑥ and ⑧ are closed, and valve groups ③ and ⑦ are opened. If the candidate distribution mode is one machine to one pump on the cold side and multiple machines to multiple pumps on the hot side, valve groups ②, ④ and ⑦ are opened, and valve groups ③, ⑥ and ⑧ are closed. If the candidate distribution mode is multiple machines to multiple pumps on the cold side and one machine to one pump on the hot side, valve groups ②, ④ and ⑦ are closed, and valve groups ③, ⑥ and ⑧ are opened.

[0074] Please refer to Figure 2 , Figure 2 It is an optional flow chart of the distribution system control method with variable distribution mode provided in the embodiment of the present application. The distribution system control method with variable distribution mode is applied to the distribution system, and the distribution system includes multiple candidate distribution modes. The distribution system includes a heat exchanger cluster, a cold side water pump and a hot side water pump. Figure 2 The method may include but is not limited to steps S201 to S206.

[0075] Step S201, obtaining a plurality of candidate operating conditions; wherein the plurality of candidate operating conditions are operating conditions with different numbers of heat exchangers turned on, different speeds of the cold side water pump, and different speeds of the hot side water pump;

[0076] Step S202, obtaining heat exchange characteristic data of the heat exchanger cluster under each candidate operating condition under each candidate transmission and distribution mode; wherein the heat exchange characteristic data includes theoretical heat exchange load, power consumption heat exchange ratio and theoretical outlet water temperature;

[0077] Step S203, obtaining target demand data in the target area;

[0078] Step S204, selecting a selected operating condition for each candidate transmission and distribution mode from the candidate operating conditions according to the theoretical heat exchange load, the theoretical outlet water temperature, the speed of the cold side water pump, the speed of the hot side water pump, the target demand data and the power consumption and heat exchange ratio; wherein the selected operating condition has the lowest power consumption and heat exchange ratio under the corresponding candidate transmission and distribution mode;

[0079] Step S205, extracting a target operating condition with the lowest power consumption to heat exchange ratio from the multiple selected operating conditions; wherein the candidate transmission and distribution mode corresponding to the target operating condition is defined as the target transmission and distribution mode;

[0080] Step S206, controlling the transmission and distribution system according to the target transmission and distribution mode and the target working condition.

[0081] In step S201 of some embodiments, multiple candidate operating conditions are operating conditions with different numbers of heat exchangers turned on, different speeds of the cold side water pump, and different speeds of the hot side water pump. The number of heat exchangers turned on must be consistent with the number of cold side water pumps and hot side water pumps turned on. When two heat exchangers are turned on, two cold side water pumps and two hot side water pumps must be turned on accordingly. If there are a total of 5 heat exchangers in the heat exchanger cluster, and the speed range of the cold side water pump and the hot side water pump is 800-1400rpm, then the first candidate operating condition can be to turn on one heat exchanger, the speed of the cold side water pump is 800rpm, and the speed of the hot side water pump is 900rpm. The second candidate operating condition can be to turn on one heat exchanger, the speed of the cold side water pump is 1000rpm, and the speed of the hot side water pump is 900rpm. The third candidate operating condition can be to turn on two heat exchangers, the speed of the cold side water pump is 800rpm, the speed of the hot side water pump is 900rpm, and so on. The multiple candidate operating conditions are operating conditions of all possible combinations of the number of heat exchangers turned on, the speed of the cold-side water pump, and the speed of the hot-side water pump.

[0082] In step S202 of some embodiments, each candidate transmission and distribution mode corresponds to each candidate operating condition. For example, one of the candidate operating conditions is candidate operating condition A, and each candidate transmission and distribution mode corresponds to candidate operating condition A. The heat exchange characteristic data of the heat exchanger cluster of each candidate operating condition under each candidate transmission and distribution mode is calculated, and the heat exchange characteristic data includes theoretical heat exchange load, power consumption heat exchange ratio and theoretical outlet water temperature. For example, the candidate operating condition A corresponding to the first candidate transmission and distribution mode is candidate operating condition A1, the candidate operating condition A corresponding to the second candidate transmission and distribution mode is candidate operating condition A2, the candidate operating condition A corresponding to the third candidate transmission and distribution mode is candidate operating condition A3, and the candidate operating condition A corresponding to the fourth candidate transmission and distribution mode is candidate operating condition A4, then the heat exchange characteristic data corresponding to candidate operating condition A1, candidate operating condition A2, candidate operating condition A3 and candidate operating condition A4 are calculated respectively.

[0083] In some embodiments, in steps S203 to S205, the heat exchange substation serves all users in the target area, so it is necessary to collect target demand data of all users in the target area. The target demand data includes the required heat exchange load, the outlet water temperature limit value and the water pump speed safety range. If it is a cooling system, the theoretical outlet water temperature must be less than the outlet water temperature limit value, and if it is a heating system, the theoretical outlet water temperature must be greater than the outlet water temperature limit value.

[0084] Specifically, the candidate operating conditions under which the theoretical heat exchange load, theoretical outlet water temperature, speed of the cold side water pump and speed of the hot side water pump meet the target demand data and the power consumption to heat exchange ratio are screened out from the operation strategy database for each candidate transmission and distribution mode, and the candidate operating conditions with the lowest power consumption to heat exchange ratio are obtained, and multiple selected operating conditions are obtained, and then the selected operating condition with the lowest power consumption to heat exchange ratio is screened out as the target operating condition. For example, when the user's required heat exchange load is 40W, the outlet water temperature limit value is less than 2°C, and the water pump speed safety range is [800-1400rpm], four selected operating conditions that meet the target demand data and have the lowest power consumption to heat exchange ratio under each candidate transmission and distribution mode are screened out from the operation strategy database, namely, selected operating condition B1, selected operating condition B2, selected operating condition B3 and selected operating condition B4, and then the selected operating condition with the lowest power consumption to heat exchange ratio is screened out from the four selected operating conditions as the target operating condition, for example, the selected operating condition B3 is screened out as the target operating condition. The target operating condition can not only meet the needs of users, but also has the lowest power consumption to heat exchange ratio among the four candidate transmission and distribution methods, so the heat exchange efficiency of the transmission and distribution system is higher. Among them, the candidate transmission and distribution method corresponding to the target operating condition is defined as the target transmission and distribution method.

[0085] In step S206 of some embodiments, the above example is continued for explanation, the target distribution mode is one machine to one pump on the cold side and multiple machines to multiple pumps on the hot side, the target operating condition is to turn on three heat exchangers, the speed of the cold side water pump is 1000rpm, and the speed of the hot side water pump is 900rpm, then the distribution system valve groups ②, ④ and ⑦ are controlled to be opened, and valve groups ③, ⑥ and ⑧ are closed, and the distribution mode is switched to one machine to one pump on the cold side and multiple machines to multiple pumps on the hot side, and the three heat exchangers in the distribution system are controlled to be turned on, and the speed of the cold side water pump is adjusted to 1000rpm, and the speed of the hot side water pump is adjusted to 900rpm.

[0086] In one example, the cumulative operating time of each heat exchanger is recorded. When the target number of heat exchangers are to be started, the operating time of each heat exchanger is obtained and sorted from small to large according to the cumulative operating time, and the target number of heat exchangers are started.

[0087] Steps S201 to S206 shown in the embodiment of the present application are obtained by obtaining multiple candidate operating conditions, which are operating conditions with different numbers of heat exchangers turned on, different speeds of the cold side water pump and the hot side water pump. The theoretical heat exchange load, power consumption to heat exchange ratio and theoretical outlet water temperature of the heat exchanger cluster of each candidate operating condition under each candidate distribution mode are obtained, and the target demand data in the target area are obtained. The candidate operating condition with the lowest power consumption to heat exchange ratio under each candidate distribution mode that meets the target demand data is selected as the selected operating condition. The selected operating condition with the lowest power consumption to heat exchange ratio is extracted from the multiple selected operating conditions as the target operating condition, and the candidate distribution mode corresponding to the target operating condition is defined as the target distribution mode. The distribution system is controlled according to the target distribution mode and the target operating condition. The control method of the distribution system does not need to seek the best operating strategy under the existing distribution mode, change the distribution mode, or dismantle, rebuild or transform the distribution system. And the distribution system is controlled according to the target distribution mode and target operating conditions. Under the same heat exchange conditions, the power consumption and heat exchange ratio is the lowest, so it is more energy-saving and has higher heat exchange efficiency.

[0088] See also Figure 3 In some embodiments, the target demand data includes the required heat exchange load and the outlet water temperature limit value. After step S206, the control method of the distribution system with a variable distribution mode may include but is not limited to steps S301 to S306:

[0089] Step S301, obtaining the actual heat exchange load and actual outlet water temperature of the transmission and distribution system;

[0090] Step S302, comparing the actual heat exchange load with the required heat exchange load to obtain a first comparison result, and comparing the actual outlet water temperature with the outlet water temperature limit value to obtain a second comparison result, and splicing the first comparison result and the second comparison result to obtain a target comparison result;

[0091] Step S303, adjusting the target demand data according to the target comparison result to obtain target update data;

[0092] Step S304, selecting a selected update operating condition for each candidate transmission and distribution mode from the candidate operating conditions according to the theoretical heat exchange load, the theoretical outlet water temperature, the speed of the cold side water pump, the speed of the hot side water pump, the target update data and the power consumption to heat exchange ratio; wherein the selected update operating condition has the lowest power consumption to heat exchange ratio under the corresponding candidate transmission and distribution mode;

[0093] Step S305, extracting a target update condition with the lowest power consumption and heat exchange ratio from the multiple selected update conditions; wherein the candidate transmission and distribution mode corresponding to the target update condition is defined as the update transmission and distribution mode;

[0094] Step S306, controlling the transmission and distribution system according to the updated transmission and distribution mode and the target updated working condition.

[0095] See also Figure 4 In some embodiments, step S301 may include but is not limited to steps S401 to S402:

[0096] Step S401, obtaining the actual water inlet temperature, actual water outlet temperature and flow parameters of the distribution system;

[0097] Step S402, performing heat calculation according to the preset specific heat capacity coefficient, actual water inlet temperature, actual water outlet temperature and flow parameters to obtain the actual heat exchange load.

[0098] In step S401 of some embodiments, the actual water inlet temperature is obtained by a temperature sensor provided on the water inlet pipe, and the actual water outlet temperature and flow parameters are obtained by a temperature sensor and a flow sensor provided on the water outlet pipe.

[0099] In step S402 of some embodiments, after the distribution system is controlled according to the target distribution mode and target working condition, it is necessary to determine whether the actual heat exchange load and the actual outlet water temperature meet the user's needs. Therefore, the actual heat exchange load and the actual outlet water temperature need to be calculated. Specifically, the specific heat capacity coefficient is the specific heat capacity of the liquid in the pipeline, and the actual heat exchange load is calculated by the following formula (2):

[0100] , (2)

[0101] in, is the actual heat transfer load, is the specific heat capacity coefficient, is the flow parameter, It is the difference between the actual water outlet temperature and the actual water inlet temperature.

[0102] In step S401 to step S402 shown in this embodiment, the actual heat exchange load and the actual outlet water temperature are calculated, and then it is determined whether the user demand is met based on the actual heat exchange load and the actual outlet water temperature.

[0103] In step S302 of some embodiments, in the cooling system or the heating system, the actual heat exchange load is greater than or equal to the required heat exchange load, and the actual heat exchange load can meet the user's demand. In the cooling system, the actual outlet water temperature is less than or equal to the outlet water temperature limit value, and the actual outlet water temperature can meet the user's demand. In the heating system, the actual outlet water temperature is greater than or equal to the outlet water temperature limit value, and the actual outlet water temperature can meet the user's demand.

[0104] Specifically, the first comparison result may be that the actual heat exchange load is greater than or equal to the required heat exchange load, or that the actual heat exchange load is less than the required heat exchange load. If it is a cooling system, the second comparison result may be that the actual outlet water temperature is less than or equal to the outlet water temperature limit value, or that the actual outlet water temperature is greater than the outlet water temperature limit value. If it is a heating system, the second comparison result may be that the actual outlet water temperature is greater than or equal to the outlet water temperature limit value, or that the actual outlet water temperature is less than the outlet water temperature limit value.

[0105] It should be noted that if the first comparison result is that the actual heat exchange load is greater than or equal to the required heat exchange load, and the second comparison result is that the actual outlet water temperature is greater than the outlet water temperature limit value, then the target comparison result is that the actual heat exchange load is greater than or equal to the required heat exchange load, and the actual outlet water temperature is greater than the outlet water temperature limit value.

[0106] See also Figure 5 In some embodiments, the distribution system is a cooling system or a heating system, and step S303 may include but is not limited to steps S501 to S502:

[0107] Step S501, if the transmission and distribution system is a cooling system, and the target comparison result indicates that the actual heat exchange load is less than the required heat exchange load, and / or the actual outlet water temperature is greater than the outlet water temperature limit value, adjust the target demand data to obtain target update data;

[0108] Step S502, if the transmission and distribution system is a heating system, and the target comparison result is characterized by the actual heat exchange load being less than the required heat exchange load, and / or the actual outlet water temperature being less than the outlet water temperature limit value, the target demand data is adjusted to obtain target update data.

[0109] In step S501 of some embodiments, in the cooling system, when the actual heat exchange load is less than the required heat exchange load, it means that the actual heat exchange load does not meet the user's demand. The actual outlet water temperature is greater than the outlet water temperature limit value, which means that the actual outlet water temperature does not meet the user's demand. As long as at least one of the above two situations occurs, the target demand data needs to be adjusted. Since both the actual heat exchange load and the actual outlet water temperature can be adjusted when adjusting the heat exchange load of the transmission and distribution system, it is only necessary to adjust the required heat exchange load in the target demand data, so that when screening based on the required heat exchange load, the target operating condition in which the theoretical heat exchange load meets the required heat exchange load is screened out, so that when the transmission and distribution system is controlled according to the target operating condition, the heat exchange load of the transmission and distribution system can be adjusted.

[0110] Specifically, in the cooling system, the actual heat exchange load is less than the required heat exchange load, and / or the actual outlet water temperature is greater than the outlet water temperature limit value, and the required heat exchange load needs to be increased to obtain the required update load. If the difference between the required heat exchange load and the actual heat exchange load is defined as the heat exchange difference, and the difference between the actual outlet water temperature and the outlet water temperature limit value is defined as the temperature difference, then the adjustment method can be a first mapping relationship between the pre-calibrated heat exchange difference and the heat exchange adjustment value, and a second mapping relationship between the temperature difference and the heat exchange adjustment value. The heat exchange adjustment value is obtained based on the heat exchange difference, and the required update load is the sum of the required heat exchange load and the heat exchange adjustment value. If both the heat exchange difference and the temperature difference exist, only the maximum heat exchange adjustment value is used for adjustment. Adjust the target demand data to obtain the target update data, and the target update data includes the demand update load and the outlet water temperature limit value.

[0111] In step S502 of some embodiments, in the heating system, when the actual heat exchange load is less than the required heat exchange load, it means that the actual heat exchange load does not meet the user's demand. The actual outlet water temperature is less than the outlet water temperature limit value, which means that the actual outlet water temperature does not meet the user's demand. As long as at least one of the above two situations occurs, the target demand data needs to be adjusted. Since both the actual heat exchange load and the actual outlet water temperature can be adjusted when adjusting the heat exchange load of the transmission and distribution system, it is only necessary to adjust the required heat exchange load in the target demand data, so that when screening based on the required heat exchange load, the target operating condition in which the theoretical heat exchange load meets the required heat exchange load is screened out, so that when the transmission and distribution system is controlled according to the target operating condition, the heat exchange load of the transmission and distribution system can be adjusted.

[0112] Specifically, in the heating system, the actual heat exchange load is less than the required heat exchange load, and / or the actual outlet water temperature is less than the outlet water temperature limit value, and the required heat exchange load needs to be increased to obtain the required update load. The target update data includes the required update load and the outlet water temperature limit value. The specific adjustment method is the same as the above adjustment method, which will not be repeated here.

[0113] In step S501 to step S502 shown in this embodiment, when the actual heat exchange load and / or the actual outlet water temperature do not meet the user's needs, the target demand data is adjusted to obtain the target update data, so that when the candidate working conditions are screened based on the target update data, the target working condition where the actual heat exchange load and / or the actual outlet water temperature meet the user's needs can be screened.

[0114] In step S304 of some embodiments, the target update data is used as a limiting condition for re-screening, that is, the candidate operating condition whose theoretical heat exchange load, theoretical outlet water temperature, speed of the cold side water pump and speed of the hot side water pump under each candidate distribution mode meet the target update data and has the lowest power consumption to heat exchange ratio is screened out as the selected update operating condition.

[0115] In step S305 of some embodiments, after selecting multiple selected update conditions, the selected update condition with the lowest power consumption and heat exchange ratio is selected from the multiple selected update conditions as the target update condition. The candidate transmission and distribution method corresponding to the target update condition is defined as the update transmission and distribution method.

[0116] In step S306 of some embodiments, the above example is continued for explanation, the target distribution mode is one machine to one pump on the cold side, and multiple machines to multiple pumps on the hot side, the target working condition is to open three heat exchangers, the speed of the cold side water pump is 1000rpm, and the speed of the hot side water pump is 900rpm. Control the distribution system valve groups ②, ④ and ⑦ to open, and the valve groups ③, ⑥ and ⑧ to close, the distribution mode is one machine to one pump on the cold side, and multiple machines to multiple pumps on the hot side, and control the three heat exchangers in the distribution system to open, and adjust the speed of the cold side water pump to 1000rpm, and the speed of the hot side water pump to 900rpm. If the actual heat exchange load and / or the actual outlet water temperature calculated do not meet the user's needs, the target update working condition is re-screened. If the updated distribution mode is multi-machine to multi-pump mode on both sides, the target update condition is to open 4 heat exchangers, the speed of the cold side water pump is 900rpm, and the speed of the hot side water pump is 800rpm. Then, based on the previous situation, control the distribution system valve groups ②, ④, ⑥ and ⑧ to close, valve groups ③ and ⑦ to open, and then open one heat exchanger and adjust the speed of the cold side water pump to 900rpm, and the speed of the hot side water pump to 800rpm.

[0117] It should be noted that after the distribution system is controlled according to the updated distribution mode and the target updated operating condition, steps S301 to S306 should be continued until the actual heat exchange load and / or the actual outlet water temperature meet the user's needs.

[0118] In steps S301 to S306 of this embodiment, by obtaining the actual heat exchange load and the actual outlet water temperature, when the actual heat exchange load and the actual outlet water temperature do not meet the user's needs, the target demand data is adjusted, and multiple candidate working conditions are re-screened to obtain the target updated working condition. When the distribution system is controlled based on the updated distribution mode and the target updated working condition, the actual heat exchange load and the actual outlet water temperature can better meet the user's needs.

[0119] See also Figure 6 In some embodiments, after step S303, the control method of the distribution system with a variable distribution mode may include but is not limited to steps S601 to S603:

[0120] Step S601, obtaining the difference between the actual heat exchange load and the required heat exchange load to obtain the heat exchange difference, obtaining the difference between the actual outlet water temperature and the outlet water temperature limit value to obtain the temperature difference;

[0121] Step S602, if the distribution system is a cooling system, adjusting the speed of the cold side water pump according to the heat exchange difference or the temperature difference;

[0122] Step S603, if the transmission and distribution system is a heating system, the speed of the hot side water pump is adjusted according to the heat exchange difference or the temperature difference.

[0123] In step S601 of some embodiments, when the target demand data needs to be adjusted, it indicates that the actual heat exchange load and / or the actual outlet water temperature do not meet the user's demand. Therefore, it is necessary to obtain the heat exchange difference between the actual heat exchange load and the required heat exchange load, and the temperature difference between the actual outlet water temperature and the outlet water temperature limit value, so as to adjust the speed of the water pump based on the heat exchange difference or the temperature difference, thereby adjusting the actual heat exchange load and the actual outlet water temperature.

[0124] In step S602 of some embodiments, in the cooling system, increasing the speed of the cold side water pump can increase the flow rate of the cooling medium accordingly, thereby increasing the heat exchange capacity of the cooling system, increasing the actual heat exchange load and reducing the actual outlet water temperature, so that the actual heat exchange load and the actual outlet water temperature are more in line with user needs. The speed of the cold side water pump can be adjusted by the heat exchange difference or the temperature difference, or by the maximum difference between the heat exchange difference and the temperature difference. The larger the difference, the greater the speed adjustment.

[0125] In step S603 of some embodiments, in the heating system, increasing the speed of the hot side water pump can increase the flow rate of the heat medium (such as hot water) accordingly, thereby increasing the heat exchange capacity of the heating system, increasing the actual heat exchange load and increasing the actual outlet water temperature, so that the actual heat exchange load and the actual outlet water temperature are more in line with user needs. The speed of the cold side water pump can be adjusted by the heat exchange difference or the temperature difference, or the speed of the hot side water pump can be adjusted by the largest difference between the heat exchange difference and the temperature difference. The larger the difference, the greater the speed adjustment.

[0126] In one example, a third mapping relationship between the heat exchange difference and the speed adjustment value, and a fourth mapping relationship between the temperature difference and the speed adjustment value can be pre-calibrated. If it is a cooling system, the speed of the cold side water pump is adjusted according to the speed adjustment value, and if it is a heating system, the speed of the hot side water pump is adjusted according to the speed adjustment value.

[0127] In the steps S601 to S603 shown in this embodiment, when the actual heat exchange load and the actual outlet water temperature do not meet the user's needs, the candidate working conditions may not be screened again, but only the speed of the water pump may be adjusted based on the current distribution mode and working condition of the distribution system. In the case of meeting the user's needs, the adjustment speed is improved.

[0128] See also Figure 7In some embodiments, the distribution system is a cooling system or a heating system, and the target demand data includes the required heat exchange load, the outlet water temperature limit value, and the pump speed safety range. Step S204 may include but is not limited to steps S701 to S702:

[0129] Step S701, if the transmission and distribution system is a cooling system, then under each candidate transmission and distribution mode, the candidate operating conditions are screened out, in which the theoretical heat exchange load is greater than or equal to the required heat exchange load, the theoretical outlet water temperature is less than or equal to the outlet water temperature limit value, the speed of the cold side water pump and the speed of the hot side water pump are within the water pump speed safety range, and the power consumption heat exchange ratio is the lowest, and a plurality of selected operating conditions are obtained;

[0130] Step S702, if the transmission and distribution system is a heating system, then under each candidate transmission and distribution mode, the candidate operating conditions are screened out, in which the theoretical heat exchange load is greater than or equal to the required heat exchange load, the theoretical outlet water temperature is greater than or equal to the outlet water temperature limit value, the speed of the cold side water pump and the speed of the hot side water pump are within the water pump speed safety range, and the power consumption to heat exchange ratio is the lowest, and a plurality of selected operating conditions are obtained.

[0131] In step S701 of some embodiments, in the cooling system, it is necessary to select the candidate operating conditions under each candidate distribution mode, in which the theoretical heat exchange load is greater than or equal to the required heat exchange load, the theoretical outlet water temperature is less than or equal to the outlet water temperature limit value, the speed of the cold side water pump and the speed of the hot side water pump are within the water pump speed safety range, and the power consumption to heat exchange ratio is the lowest as the selected operating condition. The optimization problem can be described as the following formula (3) and formula (4).

[0132] , (3)

[0133] , (4)

[0134] in, Represents the total power of all pumps, Indicates the cold side The power of the water pump, Indicates the hot side The power of the water pump, Indicates The heat transfer capacity of each heat exchanger, The heat transfer capacity of a heat exchanger is the theoretical heat transfer load. It represents the power consumption to heat exchange ratio, represents the required heat transfer load, Indicates the theoretical outlet water temperature. Indicates the outlet water temperature limit value. Indicates the minimum speed of the cold side water pump. Indicates the maximum speed of the cold side water pump. Indicates the cold side The speed of the water pump, Indicates the minimum speed of the hot side water pump, Indicates the maximum speed of the hot side water pump, Indicates the hot side The speed of the water pump. That is, the safe range of the speed of the cold side water pump is [ ], the safe range of the hot side water pump speed is [ ]. It can be seen from formula (1) that under the same heat exchange conditions, the smaller the power consumption heat exchange ratio is, the smaller the total power of all water pumps is.

[0135] In step S702 of some embodiments, in the heating system, it is necessary to screen out the candidate operating conditions as the selected operating conditions, in which the theoretical heat exchange load is greater than or equal to the demand heat exchange load, the theoretical outlet water temperature is greater than or equal to the outlet water temperature limit value, the speed of the cold side water pump and the speed of the hot side water pump are within the water pump speed safety range, and the power consumption to heat exchange ratio is the lowest, under each candidate distribution mode.

[0136] In steps S701 to S702 shown in this embodiment, under the premise of ensuring the heat exchange load required by the user and the water outlet temperature limit value, it is also considered that the water pump speed operates within the water pump speed safety range, thereby ensuring the safe operation of the water pump groups on both sides of the heat exchanger cluster and minimizing the power consumption of the water pumps of the heat exchanger cluster, so as to achieve the most economical power consumption to heat exchange ratio, the most energy-saving and the most emission-reducing.

[0137] See also Figure 8 In some embodiments, step S202 includes but is not limited to steps S801 to S802:

[0138] Step S801, obtaining a pipe network flow model, a water pump model and a heat exchanger model of a transmission and distribution system;

[0139] Step S802, solving the heat exchange characteristic data of each candidate operating condition under each candidate transmission and distribution mode according to the pipeline network flow model, the water pump model and the heat exchanger model.

[0140] In step S801 of some embodiments, the pipeline network flow model of the distribution system is as shown in the following formula (5):

[0141] , (5)

[0142] in, Indicates The outlet pressure of the pipeline section, Indicates Pipeline inlet pressure, represents the pipeline friction resistance coefficient, represents the fluid density, Indicates Length of pipe segment, Indicates Equivalent diameter of pipe segment, Indicates The cross-sectional area of ​​the pipe segment, Indicates The mass flow rate at the inlet of the segment pipe, It represents the angle between the pipe and the horizontal plane. represents the acceleration due to gravity, It represents the axial component of fluid acceleration.

[0143] The variable frequency water pump model is shown in the following formula (6) to formula (14):

[0144] Specifically, the flow rate of the water pump under different working conditions is calculated by the following formula (6):

[0145] , (6)

[0146] in, Indicates that the pump is Equivalent speed under working conditions, Indicates that the pump is Equivalent speed under working conditions, Indicates that the pump is Equivalent flow rate under working conditions, Indicates that the pump is Equivalent flow rate under working conditions.

[0147] The equivalent speed is the ratio of the pump speed under this working condition to the pump speed under the rated working condition (R working condition), and the equivalent flow is the ratio of the flow under this working condition to the flow under the rated working condition, as shown in the following formulas (7)-(8):

[0148] , , (7)

[0149] , , (8)

[0150] in, express Pump speed under working conditions, Indicates the pump speed under rated working conditions, express Pump speed under working conditions, express Flow rate under working conditions, Indicates the flow rate under rated working conditions, express The flow rate under working conditions. Working conditions and The operating conditions refer to the operating conditions when the pump speed is at any value, and the rated operating conditions refer to the operating conditions at the full frequency of the pump.

[0151] The head and torque of the water pump are calculated by the following formula (9):

[0152] , (9)

[0153] in, Indicates that the pump is Equivalent head under working conditions, Indicates that the pump is Equivalent head under working conditions, Indicates that the pump is Equivalent torque under working conditions, Indicates that the pump is The equivalent torque under the working condition, where the equivalent head is calculated by the following formula (10):

[0154] , (10)

[0155] in, express or , Indicates the head under rated working conditions, Indicates The outlet pressure of the pipeline section, Indicates Pipeline inlet pressure, represents the fluid density, Represents the acceleration due to gravity.

[0156] The equivalent torque is calculated by the following formula (11):

[0157] , , (11)

[0158] in, Indicates that the pump is Equivalent torque under working conditions, Indicates that the pump is Equivalent torque under working conditions, Indicates the torque under rated working conditions, Indicates that the pump is Torque under working conditions, Water pump in Torque under working conditions.

[0159] The input power of the water pump is calculated by the following formulas (12)-(14):

[0160] , (12)

[0161] , (13)

[0162] , (14)

[0163] in, Indicates the input power of the pump, Indicates the pump speed, regardless of positive or negative sign. express or , distinguish between positive and negative signs, express or , Indicates the rotation torque of the pump impeller, represents the friction torque, Indicates the speed of the pump impeller. Indicates the friction torque of the water pump under rated working conditions, Indicates the torque under rated conditions.

[0164] The heat exchanger model is shown in the following formula (15) to formula (29):

[0165] Specifically, the pressure flow model of the heat exchanger is shown in the following formula (15) to formula (23):

[0166] , (15)

[0167] , (16)

[0168] , (17)

[0169] , (18)

[0170] , (19)

[0171] , (20)

[0172] ,(twenty one)

[0173] ,(twenty two)

[0174] ,(twenty three)

[0175] in, represents the total pressure loss of the heat exchanger, Indicates the local pressure loss at the heat exchanger interface. Indicates the pressure loss along the heat exchanger flow path. represents the average flow velocity at the heat exchanger interface, Represents the average flow velocity in each flow channel of the heat exchanger, represents the characteristic length, represents the fluid dynamic viscosity, represents the fluid kinematic viscosity, represents the corrugation angle, Indicates the particle size of the flow channel surface, is the Reynolds number, Indicates The mass flow rate at the inlet of the segment pipe, represents the pipeline friction resistance coefficient, represents the constant coefficient, Indicates the number of times the heat exchange medium on each side passes through the heat exchanger. represents the fluid density, Indicates the number of flow channels that the heat exchange medium on each side passes through in the heat exchanger. Indicates the number of plates in the heat exchanger. represents the total heat transfer area of ​​the heat exchanger, Indicates the flow channel width. Fig. 9 is a characteristic dimension diagram of the plate heat exchanger provided in the embodiment of the present application, such as Fig. 9 As shown, represents the port diameter, Indicates the vertical distance between ports, Indicates the effective width of the plate. Indicates the horizontal distance between ports, represents the flow channel angle, Indicates the vertical distance between ports.

[0176] Nusselt number of heat exchanger plates According to the Reynolds number of the liquid (cooling medium or heat transfer medium) flowing through the heat exchanger , Prandtl number and flow channel angle Calculate, where the Reynolds number is calculated using the following formula (24):

[0177] ,(twenty four)

[0178] When the Reynolds number When the Nusher number is less than or equal to 400, It is calculated by the following formula (25):

[0179] , (25)

[0180] When the Reynolds number When it is greater than or equal to 800, the Nusher number Calculated by the following formula (26)-formula (28):

[0181] , (26)

[0182] , (27)

[0183] , (28)

[0184] in, Represents the average flow velocity in each flow channel of the heat exchanger, represents the characteristic length, represents the fluid dynamic viscosity, Indicates an intermediate symbol with no specific meaning. When the Reynolds number Between 400 and 800, the Nusher number It is calculated by the following formula (29):

[0185] , (29)

[0186] In step S802 of some embodiments, after the network flow model, variable frequency water pump model and heat exchanger model are established, the above formula (5)-formula (29) are used to establish a group of equations corresponding to each candidate distribution mode, and the theoretical heat exchange load, power consumption to heat exchange ratio and theoretical outlet water temperature of each candidate operating condition under each candidate distribution mode are obtained by solving the group of equations.

[0187] In steps S801 to S802 shown in this embodiment, after solving the theoretical heat exchange load, power consumption to heat exchange ratio and theoretical outlet water temperature of each candidate operating condition under each candidate transmission and distribution mode, an operation strategy database is established according to the theoretical heat exchange load, power consumption to heat exchange ratio and theoretical outlet water temperature of each candidate operating condition under a candidate transmission and distribution mode, so as to screen the operating condition that meets user needs and has the lowest power consumption to heat exchange ratio based on the operation strategy database.

[0188] See also Fig.10 The embodiment of the present application also provides a distribution system control device with a variable distribution mode, which is applied to the distribution system and can implement the distribution system control method with the above-mentioned variable distribution mode. The distribution system includes multiple candidate distribution modes, and the control device includes a heat exchanger cluster 1001, a cold side water pump 1002, a hot side water pump 1003 and a controller 1004.

[0189] The controller 1004 includes:

[0190] The first acquisition module 110 is used to acquire multiple candidate operating conditions; wherein the multiple candidate operating conditions are operating conditions under different numbers of heat exchangers turned on, different speeds of the cold side water pump, and different speeds of the hot side water pump;

[0191] The second acquisition module 120 is used to obtain heat exchange characteristic data of the heat exchanger cluster under each candidate operating condition under each candidate transmission and distribution mode; wherein the heat exchange characteristic data includes theoretical heat exchange load, power consumption heat exchange ratio and theoretical outlet water temperature;

[0192] The third acquisition module 130 is used to acquire target demand data in the target area;

[0193] The screening module 140 is used to screen out the selected working condition of each candidate transmission and distribution mode from the candidate working conditions according to the theoretical heat exchange load, the theoretical outlet water temperature, the speed of the cold side water pump, the speed of the hot side water pump, the target demand data and the power consumption and heat exchange ratio; wherein the selected working condition has the lowest power consumption and heat exchange ratio under the corresponding candidate transmission and distribution mode;

[0194] An extraction module 150 is used to extract a target operating condition with the lowest power consumption and heat exchange ratio from a plurality of selected operating conditions; wherein the candidate transmission and distribution mode corresponding to the target operating condition is defined as a target transmission and distribution mode;

[0195] The control module 160 is used to control the distribution system according to the target distribution mode and target working condition.

[0196] The specific implementation of the control device for the distribution system with a variable distribution mode is basically the same as the specific implementation of the control method for the distribution system with a variable distribution mode mentioned above, and will not be repeated here.

[0197] The embodiment of the present application also provides an electronic device, the electronic device includes a memory and a processor, the memory stores a computer program, and the processor implements the above-mentioned variable distribution mode distribution system control method when executing the computer program. The electronic device can be any smart terminal including a tablet computer, a car computer, etc.

[0198] See also Fig.11 , Fig.11 The hardware structure of an electronic device of another embodiment is illustrated, and the electronic device includes:

[0199] The processor 1101 may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of the present application;

[0200] The memory 1102 can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device or a random access memory (RAM). The memory 1102 can store an operating system and other application programs. When the technical solution provided in the embodiments of this specification is implemented by software or firmware, the relevant program code is stored in the memory 1102, and the processor 1101 calls and executes the distribution system control method with a variable distribution mode of the embodiment of the present application;

[0201] Input / output interface 1103, used to implement information input and output;

[0202] The communication interface 1104 is used to realize the communication interaction between the device and other devices. The communication can be realized through a wired manner (such as USB, network cable, etc.) or a wireless manner (such as mobile network, WIFI, Bluetooth, etc.);

[0203] A bus 1105 that transmits information between various components of the device (e.g., the processor 1101, the memory 1102, the input / output interface 1103, and the communication interface 1104);

[0204] The processor 1101 , the memory 1102 , the input / output interface 1103 and the communication interface 1104 are connected to each other in communication within the device via the bus 1105 .

[0205] An embodiment of the present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the distribution system control method with the above-mentioned variable distribution mode is implemented.

[0206] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a memory remotely disposed relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0207] The embodiments described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0208] Those skilled in the art will appreciate that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than shown in the figures, or a combination of certain steps, or different steps.

[0209] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0210] Those skilled in the art will appreciate that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0211] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0212] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0213] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the above units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0214] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0215] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0216] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including multiple instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, referred to as ROM), random access memory (Random Access Memory, referred to as RAM), disk or optical disk and other media that can store programs.

[0217] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the rights of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present invention should be within the scope of the rights of the present invention.

Claims

1. A method for controlling a distribution system with a variable distribution mode, characterized in that: Applied to a distribution system, the distribution system includes multiple candidate distribution modes, the distribution system includes a heat exchanger cluster, a cold side water pump and a hot side water pump, the method includes: Acquire multiple candidate operating conditions; wherein the multiple candidate operating conditions are operating conditions with different numbers of heat exchangers turned on, different rotation speeds of the cold side water pump, and different rotation speeds of the hot side water pump; Obtaining heat exchange characteristic data of the heat exchanger cluster under each candidate operating condition under each candidate transmission and distribution mode; wherein the heat exchange characteristic data includes theoretical heat exchange load, power consumption heat exchange ratio and theoretical water outlet temperature; Obtain target demand data in the target area; Filtering the selected operating condition of each candidate transmission and distribution mode from the candidate operating conditions according to the theoretical heat exchange load, the theoretical outlet water temperature, the speed of the cold side water pump, the speed of the hot side water pump, the target demand data and the power consumption to heat exchange ratio; wherein the selected operating condition has the lowest power consumption to heat exchange ratio under the corresponding candidate transmission and distribution mode; Extracting the target operating condition with the lowest power consumption to heat exchange ratio from the multiple selected operating conditions; wherein the candidate transmission and distribution mode corresponding to the target operating condition is defined as the target transmission and distribution mode; The transmission and distribution system is controlled according to the target transmission and distribution mode and the target operating condition.

2. The method according to claim 1, characterized in that The target demand data includes a required heat exchange load and an outlet water temperature limit value. After controlling the distribution system according to the target distribution mode and the target operating condition, the method further includes: Obtaining the actual heat exchange load and actual outlet water temperature of the transmission and distribution system; Comparing the actual heat exchange load with the required heat exchange load to obtain a first comparison result, and comparing the actual outlet water temperature with the outlet water temperature limit value to obtain a second comparison result, and splicing the first comparison result and the second comparison result to obtain a target comparison result; Adjust the target demand data according to the target comparison result to obtain target update data; Filtering the selected update operating condition of each candidate transmission and distribution mode from the candidate operating conditions according to the theoretical heat exchange load, the theoretical outlet water temperature, the speed of the cold side water pump, the speed of the hot side water pump, the target update data and the power consumption to heat exchange ratio; wherein the selected update operating condition has the lowest power consumption to heat exchange ratio under the corresponding candidate transmission and distribution mode; Extracting the target update operating condition with the lowest power consumption and heat exchange ratio from the multiple selected update operating conditions; wherein the candidate transmission and distribution mode corresponding to the target update operating condition is defined as an update transmission and distribution mode; The distribution system is controlled according to the updated distribution mode and the target updated operating condition.

3. The method according to claim 2, characterized in that The transmission and distribution system is a cooling system or a heating system, and the target demand data is adjusted according to the target comparison result to obtain target update data, including: If the transmission and distribution system is the cooling system, and the target comparison result is characterized by the actual heat exchange load being less than the required heat exchange load, and / or the actual outlet water temperature being greater than the outlet water temperature limit value, adjusting the target demand data to obtain target update data; If the transmission and distribution system is the heating system, and the target comparison result is characterized by the actual heat exchange load being less than the required heat exchange load, and / or the actual outlet water temperature being less than the outlet water temperature limit value, the target demand data is adjusted to obtain target update data.

4. The method according to claim 2, characterized in that: The transmission and distribution system is a cooling system or a heating system. After adjusting the target demand data according to the target comparison result to obtain target update data, the method further includes: Obtaining a difference between the actual heat exchange load and the required heat exchange load to obtain a heat exchange difference, and obtaining a difference between the actual outlet water temperature and the outlet water temperature limit value to obtain a temperature difference; If the transmission and distribution system is the cooling system, the rotation speed of the cold side water pump is adjusted according to the heat exchange difference or the temperature difference; If the transmission and distribution system is the heating system, the rotation speed of the hot side water pump is adjusted according to the heat exchange difference or the temperature difference.

5. The method according to claim 2, characterized in that: The obtaining of the actual heat exchange load and the actual outlet water temperature of the transmission and distribution system comprises: Obtaining actual water inlet temperature, actual water outlet temperature and flow parameters of the distribution system; The actual heat exchange load is obtained by performing heat calculation according to the preset specific heat capacity coefficient, the actual water inlet temperature, the actual water outlet temperature and the flow parameter.

6. The method according to claim 1, characterized in that The transmission and distribution system is a cooling system or a heating system, the target demand data includes the required heat exchange load, the outlet water temperature limit value and the water pump speed safety range, and the selected operating condition of each candidate transmission and distribution mode is screened from the candidate operating conditions according to the theoretical heat exchange load, the theoretical outlet water temperature, the speed of the cold side water pump, the speed of the hot side water pump, the target demand data and the power consumption heat exchange ratio, including: If the transmission and distribution system is the cooling system, then under each of the candidate transmission and distribution modes, the candidate operating conditions are screened out, in which the theoretical heat exchange load is greater than or equal to the required heat exchange load, the theoretical outlet water temperature is less than or equal to the outlet water temperature limit value, the speed of the cold side water pump and the speed of the hot side water pump are within the water pump speed safety range, and the power consumption to heat exchange ratio is the lowest, to obtain a plurality of the selected operating conditions; If the transmission and distribution system is the heating system, then under each of the candidate transmission and distribution modes, the candidate operating conditions in which the theoretical heat exchange load is greater than or equal to the required heat exchange load, the theoretical outlet water temperature is greater than or equal to the outlet water temperature limit value, the speed of the cold side water pump and the speed of the hot side water pump are within the water pump speed safety range, and the power consumption to heat exchange ratio is the lowest are screened out to obtain a plurality of selected operating conditions.

7. The method according to claim 1, characterized in that The obtaining of the heat exchange characteristic data of the heat exchanger cluster in each candidate operating condition under each candidate transmission and distribution mode includes: Obtaining a pipe network flow model, a water pump model and a heat exchanger model of the transmission and distribution system; The heat exchange characteristic data of each candidate operating condition under each candidate transmission and distribution mode is solved according to the pipeline flow model, the water pump model and the heat exchanger model.

8. A distribution system control device with a variable distribution mode, characterized in that: Applied to a distribution system, the distribution system includes a plurality of candidate distribution modes, the control device includes a heat exchanger cluster, a cold side water pump, a hot side water pump and a controller; The controller comprises: A first acquisition module is used to acquire a plurality of candidate operating conditions; wherein the plurality of candidate operating conditions are operating conditions under different numbers of heat exchangers turned on, different rotation speeds of the cold side water pump, and different rotation speeds of the hot side water pump; The second acquisition module is used to obtain the heat exchange characteristic data of the heat exchanger cluster in each candidate operating condition under each candidate transmission and distribution mode; wherein the heat exchange characteristic data includes theoretical heat exchange load, power consumption heat exchange ratio and theoretical water outlet temperature; The third acquisition module is used to acquire target demand data in the target area; A screening module, for screening out a selected operating condition of each candidate transmission and distribution mode from the candidate operating conditions according to the theoretical heat exchange load, the theoretical outlet water temperature, the speed of the cold side water pump, the speed of the hot side water pump, the target demand data and the power consumption to heat exchange ratio; wherein the selected operating condition has the lowest power consumption to heat exchange ratio under the corresponding candidate transmission and distribution mode; An extraction module is used to extract the target operating condition with the lowest power consumption and heat exchange ratio from the multiple selected operating conditions; wherein the candidate transmission and distribution mode corresponding to the target operating condition is defined as the target transmission and distribution mode; A control module is used to control the distribution system according to the target distribution mode and the target working condition.

9. An electronic device, characterized in that: The electronic device includes a memory and a processor, the memory stores a computer program, and the processor implements the method for controlling a distribution system with a variable distribution mode as described in any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method for controlling a distribution system with a variable distribution mode according to any one of claims 1 to 7 is implemented.

Images