CN112432269A - Method and system for optimizing set value of pressure difference of refrigerating water pump of refrigerating room - Google Patents
Method and system for optimizing set value of pressure difference of refrigerating water pump of refrigerating room Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0003—Exclusively-fluid systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/003—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for cooling towers
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Abstract
The invention relates to a method and a system for optimizing a set value of a pressure difference of a refrigerating water pump of a refrigerating room, wherein the method comprises the following steps: s1, collecting a current pressure difference set value, an opening degree of an adjusting valve and water flow of a tail end branch of the chilled water pump based on the Internet of things; s2, determining a normally working regulating valve through a data cleaning and fault diagnosis algorithm deployed on the Internet of things platform; s3, screening out the maximum opening regulating valves and the number of the maximum opening regulating valves; S4-S7, according to the number of the maximum opening regulating valves, setting the difference value between the water flow and the actual water flow of the branch with the maximum valve position to determine the optimal pressure difference set value or a new current pressure difference set value; and S8, issuing the new current pressure difference set value or the optimal pressure difference set value to a PLC (programmable logic controller) of a refrigeration machine room through an edge gateway to control the variable speed regulation operation of the refrigeration water pump, and jumping to execute S1. The beneficial effects are based on high efficiency, the easy to carry out of terminal valve position aperture control and thing networking data acquisition.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of a central air-conditioning refrigeration machine room, in particular to a method and a system for optimizing a differential pressure set value of a refrigeration water pump of a refrigeration machine room based on a tail end valve position.
[ background of the invention ]
Classifying a central air conditioning water system: 1. cooling water systems (cooling towers, cooling water pipes, cooling water pumps, condensers, valves, and the like); 2. chilled water systems (chilled water pipes, chilled water pumps, valves, end equipment, expansion tanks, insulation, etc.); 3. a condensate water system. The cooling tower is mainly used for cooling a refrigerant in the refrigerating unit; a frozen water pump: the chilled water is arranged at the front end of the water chilling unit, and the chilled water returning from the tail end is pumped back to the water chilling unit through the chilled water pump; cooling water pump: the cooling water pump is arranged on a water path of the cooling water inlet unit, and the cooling water from the cooling tower is pumped back to the unit through the cooling water pump; a hot water circulating pump: and the hot water returning from the tail end is pumped back to the plate heat exchanger through a hot water circulating pump.
It is well known that for central air conditioning systems, the design load is calculated substantially in terms of outdoor extreme meteorological parameter conditions, whereas in practice the system rarely operates at full load conditions. Statistically, the air conditioning system operates below 70% load rate for about 97% of the time; more than 70% of the time runs below 50% load factor, i.e. there is "big horse drawn dolly". Under partial load, for a variable flow air-conditioning water system, the phenomenon of large flow and small temperature difference can occur in the operation, and the power consumption of the water pump is seriously wasted. Aiming at energy conservation of a refrigeration machine room, the problem of low efficiency of the refrigeration machine room under partial load is solved; the research on the fluid transmission and distribution pipe network is based on the premise of stable and safe operation, and the energy-saving potential of the water pump is deeply excavated on the basis of ensuring the comfort requirement of a user.
In industrial projects, the frequency conversion of a chilled water pump is controlled by the pressure difference of a main pipe, the pressure difference of the main pipe is usually a value meeting the maximum load condition, but a refrigeration machine room works under the partial load condition in most cases, and unnecessary resistance is consumed on a tail end valve at the moment. In most industrial projects, the implementation of an automatic control system of a refrigeration machine room and the implementation of a terminal automatic control system are separated, and construction is usually performed by different companies, so that a differential pressure set value and terminal valve position state information of the refrigeration machine room are in a mutually split state and cannot be fused in a system, and the differential pressure set value on a chilled water pipe of the refrigeration machine room cannot be optimally set according to the terminal valve position. Another reason why the variable pressure difference setting value based on the terminal valve position is difficult to implement is that even if the terminal valve position information can be accessed into the PLC of the automatic control of the refrigeration machine room, the PLC cannot judge whether the chilled water valve is in a fault state when the number of the terminal valves is large, the operation and maintenance personnel are unreasonable to operate, the valves are damaged, and the like, so that an unreasonable pressure difference setting value is obtained.
The edge gateway is a gateway deployed at the edge of a network, and is connected with a physical world and a digital world through functions of network connection, protocol conversion and the like, so that light connection management, real-time data analysis and application management functions are provided.
Modbus is an industrial field bus protocol standard, and the Modbus protocol based on the Ethernet TCP/IP is introduced in 1996: modbus TCP, Modbus protocol is an application layer message transmission protocol, including three types of ASCII, RTU, TCP message, the standard Modbus protocol physical layer interface has RS232, RS422, RS485 and Ethernet interface, adopts master/slave mode communication. OPC (Object Linking and Embedding (OLE) for Process Control) is an application of Object connecting and Embedding technology in Process Control, the OPC specification develops from the technical basis of OLE/COM/DCOM, and establishes a unified standard for the development of Object-oriented industrial automation software in a C/S mode, and the standard defines a method for carrying out automatic data real-time exchange between PC-based clients. Programmable Logic Controller (PLC), a digital operation Controller with microprocessor for automatic control, can load control instructions into memory at any time for storage and execution, and the PLC is composed of a CPU, an instruction and data memory, an input/output interface, a power supply, and a digital-to-analog conversion functional unit. Data cleansing (Data cleansing) the process of re-examining and verifying Data aims to remove duplicate information, correct existing errors, and provide Data consistency. The Fault Diagnosis Algorithm, the problem of Fault Diagnosis, can be described as a process of managing Fault components on the premise that observed symptoms are known, Fault Diagnosis algorithms include group intelligent algorithms, group Diagnosis algorithms, equation Diagnosis algorithms and the like, at present, the research on network-oriented Fault management is relatively mature, and many network management systems introduced in the market by the industry all include corresponding Fault management modules.
The invention utilizes the information acquisition and processing technology based on the Internet of things, and carries out technical improvement aiming at the technical problem that the variable pressure difference set value based on the terminal valve position is difficult to implement in the practical industrial project.
[ summary of the invention ]
The invention aims to provide a method for optimizing a differential pressure set value of a refrigerating water pump of a refrigerating machine room, which is efficient and easy to implement based on terminal valve position opening control and internet of things data acquisition.
In order to achieve the aim, the technical scheme adopted by the invention is a method for optimizing the set value of the pressure difference of a refrigerating water pump of a refrigerating room, which comprises the following steps:
s1, collecting a current pressure difference set value, an opening degree of an adjusting valve and water flow of a tail end branch of the chilled water pump based on the Internet of things;
s2, determining a normally working regulating valve through a data cleaning and fault diagnosis algorithm deployed on the Internet of things platform;
s3, screening out the maximum opening regulating valves and the number of the maximum opening regulating valves;
s4, if the maximum number of the regulating valves with the opening degree is equal to 1, the branch at the tail end of the regulating valve is the maximum valve position branch, the difference value between the set water flow and the actual water flow of the maximum valve position branch is not larger than the set error, the current pressure difference set value is output as the optimal pressure difference set value, and S8 is executed in a skipping mode;
s5, if the maximum regulating valve number of the opening is equal to 1, and the difference value between the set water flow and the actual water flow of the maximum valve position branch is larger than the set error, the current pressure difference set value is increased by the set increment and then output as a new current pressure difference set value, and S8 is executed in a skipping mode;
s6, if the maximum number of the regulating valves with the opening degree is more than 1, the current pressure difference set value is increased by a set increment and then output as a new current pressure difference set value, and S8 is executed in a skipping manner;
s7, if the maximum opening regulating valve does not exist, the current pressure difference set value is reduced by a set increment and then output as a new current pressure difference set value, and S8 is executed in a skipping mode;
and S8, issuing the new current pressure difference set value or the optimal pressure difference set value to a PLC (programmable logic controller) of a refrigeration machine room through an edge gateway to control the variable speed regulation operation of the refrigeration water pump, and jumping to execute S1.
Preferably, the setting error and the setting increment are determined according to the structure of the tail branch of the chilled water pump and hydraulic characteristic parameters.
Preferably, the maximum opening regulating valve is a regulating valve with an opening of 100%.
The invention further aims to provide a system for optimizing the pressure difference set value of the refrigerating water pump of the refrigerating machine room, which is efficient and easy to implement based on the opening control of the tail end valve position and the data acquisition of the internet of things.
In order to achieve the above another purpose, the technical scheme adopted by the invention is a system for optimizing the pressure difference set value of a refrigerating machine room refrigerating water pump, wherein the system for optimizing the pressure difference set value comprises an internet of things platform, a plurality of edge gateways, a refrigerating machine room PLC and a tail end air conditioning box PLC; the platform of the Internet of things collects data of a refrigeration machine room PLC through an edge gateway and controls the refrigeration machine room PLC to act, and the platform of the Internet of things controls the refrigeration machine room PLC to act through the edge gateway; the system for optimizing the pressure difference set value executes the method for optimizing the pressure difference set value of the refrigerating water pump of the refrigerating room.
Preferably, the refrigeration machine room PLC includes a manual mode, an automatic mode, and a cloud optimization control mode; when the refrigeration machine room PLC is set to be in a cloud optimization control mode, the system for optimizing the pressure difference set value executes the method for optimizing the pressure difference set value of the refrigeration water pump of the refrigeration machine room.
Preferably, the internet of things platform communicates with a refrigeration machine room PLC and a tail end air conditioning box PLC through an edge gateway through a Modbus TCP protocol or an OPC protocol.
The invention has the following beneficial effects: the variable pressure difference set value based on the tail end valve position can reduce the resistance consumed on the tail end valve to the maximum extent under the condition of meeting tail end requirements, the working principle is that the minimum acting pressure difference value meeting the worst tail end load requirements is continuously searched by utilizing the computing capacity of the platform of the Internet of things to control the variable speed regulation operation of the water pump according to the working states of all the tail ends, the valve position state and the indoor environment state, namely, on the premise of ensuring sufficient cold supply of the tail ends, the opening degree of the valve is as large as possible, and therefore the unnecessary resistance consumed on the valve is reduced.
[ description of the drawings ]
Fig. 1 is a flow chart of a method for optimizing a set value of a pressure difference of a refrigeration pump of a refrigeration room.
Fig. 2 is a system architecture diagram for optimization of a chiller room chilled water pump differential pressure set point.
Fig. 3 is a flow chart of an embodiment of a method for optimizing a set value of a pressure difference of a refrigeration pump of a refrigeration room.
[ detailed description ] embodiments
The invention is further described with reference to the following examples and with reference to the accompanying drawings.
In the present invention, a server is a computer or apparatus that provides and manages network resources on a network, and a terminal may refer to various types of devices including, but not limited to, wireless phones, cellular phones, laptop computers, multimedia wireless devices, wireless communication Personal Computer (PC) cards, Personal Digital Assistants (PDAs), external or internal modems, and the like. A client device, i.e., a terminal, can be any data device that communicates with a server over a wireless channel and/or over a wired channel, e.g., fiber optic or coaxial cables. A terminal can have a variety of names such as mobile station, mobile device, mobile unit, mobile phone, remote station, remote terminal, remote unit, user device, user equipment, handheld device, etc. Different terminals may be incorporated into one system. Terminals may be mobile or stationary and may be dispersed throughout a communication network.
Example 1
The embodiment realizes a method for optimizing the set value of the pressure difference of the refrigerating water pump of the refrigerating room.
Fig. 1 is a flowchart of a method for optimizing a set value of a pressure difference of a refrigeration chiller pump, and as shown in fig. 1, the method for optimizing the set value of the pressure difference of the refrigeration chiller pump in the embodiment includes the following steps:
s1, collecting a current pressure difference set value, an opening degree of an adjusting valve and water flow of a tail end branch of the chilled water pump based on the Internet of things;
s2, determining a normally working regulating valve through a data cleaning and fault diagnosis algorithm deployed on the Internet of things platform;
s3, screening out the maximum opening regulating valves and the number of the maximum opening regulating valves;
s4, if the maximum number of the regulating valves with the opening degree is equal to 1, the branch at the tail end of the regulating valve is the maximum valve position branch, the difference value between the set water flow and the actual water flow of the maximum valve position branch is not larger than the set error, the current pressure difference set value is output as the optimal pressure difference set value, and S8 is executed in a skipping mode;
s5, if the maximum regulating valve number of the opening is equal to 1, and the difference value between the set water flow and the actual water flow of the maximum valve position branch is larger than the set error, the current pressure difference set value is increased by the set increment and then output as a new current pressure difference set value, and S8 is executed in a skipping mode;
s6, if the maximum number of the regulating valves with the opening degree is more than 1, the current pressure difference set value is increased by a set increment and then output as a new current pressure difference set value, and S8 is executed in a skipping manner;
s7, if the maximum opening regulating valve does not exist, the current pressure difference set value is reduced by a set increment and then output as a new current pressure difference set value, and S8 is executed in a skipping mode;
and S8, issuing the new current pressure difference set value or the optimal pressure difference set value to a PLC (programmable logic controller) of a refrigeration machine room through an edge gateway to control the variable speed regulation operation of the refrigeration water pump, and jumping to execute S1.
Preferably, the setting error and the setting increment are determined according to the structure of the tail branch of the chilled water pump and hydraulic characteristic parameters.
Preferably, the maximum opening regulating valve is a regulating valve with an opening of 100%.
Example 2
The embodiment realizes a system for optimizing the set value of the pressure difference of the refrigerating water pump of the refrigerating room.
Fig. 2 is a system architecture diagram for optimizing a set value of a pressure difference of a refrigeration room refrigerating water pump, as shown in fig. 2, the system for optimizing a set value of a pressure difference of a refrigeration room refrigerating water pump according to the embodiment includes an internet of things platform, a plurality of edge gateways, a refrigeration room PLC and a tail end air conditioning box PLC; the platform of the Internet of things collects data of a refrigeration machine room PLC through an edge gateway and controls the refrigeration machine room PLC to act, and the platform of the Internet of things controls the refrigeration machine room PLC to act through the edge gateway; the system for optimizing the pressure difference set value executes the method for optimizing the pressure difference set value of the refrigeration water pump of the refrigeration room in the embodiment 1.
Preferably, the refrigeration machine room PLC includes a manual mode, an automatic mode, and a cloud optimization control mode; when the refrigeration machine room PLC is set to the cloud optimization control mode, the system for optimizing the pressure difference set value performs the method for optimizing the pressure difference set value of the refrigeration machine room chilled water pump in embodiment 1.
Preferably, the internet of things platform communicates with a refrigeration machine room PLC and a tail end air conditioning box PLC through an edge gateway through a Modbus TCP protocol or an OPC protocol.
Example 3
The embodiment realizes a method and a system for optimizing the set value of the pressure difference of the refrigerating water pump of the refrigerating room. This embodiment is specifically implemented on the basis of embodiments 1 and 2.
The embodiment provides a method and a device for optimizing a pressure difference set value of a refrigeration water pump of a high-efficiency refrigeration machine room based on an internet of things platform, aiming at the problem that a variable pressure difference set value based on a terminal valve position is difficult to implement in practical industrial projects.
The method comprises the steps that an edge gateway communicates with a PLC through a Modbus TCP protocol, and a manual mode, an automatic mode and a cloud optimization control mode are set in the PLC; when the local PLC is in the cloud optimization control mode, the edge gateway can collect the pressure difference set value from the PLC and can also transmit the pressure difference set value to the PLC from the Internet of things platform. In the same way, the edge gateway acquires all information such as the opening degree of the tail end chilled water valve through a Modbus TCP protocol or an OPC protocol, transmits the information to the Internet of things platform, performs data cleaning by using big data of the tail end valve position acquired by the Internet of things platform, judges the chilled water valve in a normal working state through a fault diagnosis algorithm, judges the minimum acting pressure difference value through the algorithm, and transmits the pressure difference value to a PLC (programmable logic controller) of a local refrigeration machine room through the edge gateway so as to control the variable speed regulation operation of the water pump. On the premise of ensuring that the cold supply at the tail end is sufficient, the opening degree of the valve is as large as possible, so that unnecessary resistance consumed on the valve is reduced.
Fig. 3 is a flowchart of an embodiment of a method for optimizing a pressure difference set value of a refrigeration pump of a refrigeration room, and as shown in fig. 3, in the embodiment, based on an optimization control strategy of a variable pressure difference set value of a tail end valve position, the opening of a two-way valve of a branch pipe with the largest valve position is fully opened by adjusting the pressure difference of a water supply and return main pipe, so that the system resistance is reduced as much as possible, and the flow demand of a user is met. And during the k time step, monitoring and comparing the opening V of the two-way valves of all the branches, screening out the branch with the maximum valve position, judging whether the opening Vmax of the two-way valve is equal to 100 percent or not, judging whether the number N of the two-way valves in the fully-opened state is equal to 1 or not, and checking whether the actual flow and the set flow deviation of the branch with the maximum valve position are within a reasonable range epsilon or not. If the conditions are met, outputting the current DPset; if not, adjusting the current pressure difference set value DPk-1 to increase or decrease the set increment delta P, and repeating the steps. And finally solving an optimal pressure difference set value DPset. The algorithm can identify the branch with the largest valve position, namely the most unfavorable branch under the condition of any flow distribution. In order to make the control system stable and flexible, epsilon and delta P should be determined according to parameters such as the structure and hydraulic characteristics of the pipe network.
The regulating characteristic of the regulating valve determines that when the regulating valve is close to full opening, a small flow interference signal can cause large change of a valve position, namely a static stability coefficient R is very small, and the condition that the valve position is frequently regulated and is difficult to converge easily occurs in a control system. Therefore, the maximum valve position opening Vmax is controlled to be 100%, not the maximum valve position branch flow Qm to Qset. Although the maximum valve position branch is difficult to reach the flow set value, the controlled object can be quickly converged and stabilized, the stability of the control system is ensured, and meanwhile, the flow deviation epsilon of the maximum valve position branch is within a reasonable range, so that the tail end cannot be greatly influenced, and the actual requirements of engineering are met.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and additions can be made without departing from the principle of the present invention, and these should also be considered as the protection scope of the present invention.
Claims (6)
1. A method for optimizing a set value of a pressure difference of a refrigerating water pump of a refrigerating room is characterized by comprising the following steps:
s1, collecting a current pressure difference set value, an opening degree of an adjusting valve and water flow of a tail end branch of the chilled water pump based on the Internet of things;
s2, determining a normally working regulating valve through a data cleaning and fault diagnosis algorithm deployed on the Internet of things platform;
s3, screening out the maximum opening regulating valves and the number of the maximum opening regulating valves;
s4, if the maximum number of the regulating valves with the opening degree is equal to 1, the branch at the tail end of the regulating valve is the maximum valve position branch, the difference value between the set water flow and the actual water flow of the maximum valve position branch is not larger than the set error, the current pressure difference set value is output as the optimal pressure difference set value, and S8 is executed in a skipping mode;
s5, if the maximum regulating valve number of the opening is equal to 1, and the difference value between the set water flow and the actual water flow of the maximum valve position branch is larger than the set error, the current pressure difference set value is increased by the set increment and then output as a new current pressure difference set value, and S8 is executed in a skipping mode;
s6, if the maximum number of the regulating valves with the opening degree is more than 1, the current pressure difference set value is increased by a set increment and then output as a new current pressure difference set value, and S8 is executed in a skipping manner;
s7, if the maximum opening regulating valve does not exist, the current pressure difference set value is reduced by a set increment and then output as a new current pressure difference set value, and S8 is executed in a skipping mode;
and S8, issuing the new current pressure difference set value or the optimal pressure difference set value to a PLC (programmable logic controller) of a refrigeration machine room through an edge gateway to control the variable speed regulation operation of the refrigeration water pump, and jumping to execute S1.
2. The method for optimizing the set value of the differential pressure of the refrigeration water pump of the refrigeration room according to claim 1, wherein the method comprises the following steps: and determining the set error and the set increment according to the structure and hydraulic characteristic parameters of the tail end branch of the chilled water pump.
3. The method for optimizing the set value of the differential pressure of the refrigeration water pump of the refrigeration room according to claim 1, wherein the method comprises the following steps: the maximum opening regulating valve refers to a regulating valve with the opening of 100%.
4. The utility model provides a system for refrigerating room frozen water pump differential pressure set value is optimized which characterized in that: the system for optimizing the pressure difference set value comprises an Internet of things platform, a plurality of edge gateways, a refrigeration machine room PLC and a tail end air conditioning box PLC; the platform of the Internet of things collects data of a refrigeration machine room PLC through an edge gateway and controls the refrigeration machine room PLC to act, and the platform of the Internet of things controls the refrigeration machine room PLC to act through the edge gateway; the system for optimizing the pressure difference set value executes the method for optimizing the pressure difference set value of the refrigeration water pump of the refrigeration room of any one of claims 1 to 3.
5. The system for optimizing a differential pressure set value of a refrigeration chiller water pump according to claim 4, wherein: the refrigeration machine room PLC comprises a manual mode, an automatic mode and a cloud optimization control mode; when the refrigeration machine room PLC is set to be in a cloud optimization control mode, the system for optimizing the pressure difference set value executes the method for optimizing the pressure difference set value of the refrigeration water pump of the refrigeration machine room in any one of claims 1 to 3.
6. The system for optimizing a differential pressure set value of a refrigeration chiller water pump according to claim 5, wherein: the Internet of things platform is communicated with a refrigeration machine room PLC and a tail end air conditioning box PLC through an edge gateway through a Modbus TCP protocol or an OPC protocol.
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| CN114484948A (en) * | 2021-12-23 | 2022-05-13 | 广东省建筑设计研究院有限公司 | Energy-saving variable-frequency linkage system of multi-stage pump |
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