Solution for merging open type cold storage system into closed type central air-conditioning system

Abstract

The invention discloses a solution for merging an open cold storage system into a closed central air-conditioning system, which relates to the technical field of energy conservation of central air-conditioning systems, and comprises the following steps of: setting a timetable automatic operation mode on an SCADA (Supervisory Control and Data Acquisition) monitoring unit according to valley, flat and peak electricity price time periods published by the State Grid Corporation of China; the SCADA monitoring unit automatically executes a cold storage mode instruction, starts a refrigeration host and controls a valve to enable ice water at the temperature of 5 DEG C to preferentially flow through a cold storage tank for heat exchange until the water outlet temperature of the cold storage tank reaches a target value; when the unit time enters a level power period, the SCADA monitoring unit is switched to a cold machine mode according to a time table instruction, a cold storage tank pipeline valve is closed, and independent cold supply of the refrigeration main machine is recovered; and when the unit time enters the peak power period, the SCADA monitoring unit executes the peak power mode instruction. The self-operated pressure balance valve is used for dynamically adjusting the grid-connected voltage difference based on the PID algorithm to achieve pressure pre-balance, then the electric adjusting valve is controlled to be slowly opened, and the refrigeration main machine is started to achieve collaborative cooling.

Description

Technical Field

[0001] This invention relates to the field of energy-saving technology for central air conditioning systems, and in particular to a solution for integrating an open-type cold storage system into a closed-type central air conditioning system. Background Technology

[0002] In the field of energy-saving technology for central air conditioning systems, cold storage technology that utilizes time-of-use electricity pricing to achieve peak shaving and valley filling has been widely applied. Open-loop cold storage systems, due to their advantages such as high cold storage density, simple structure, and low cost, are often used for cold energy storage in large buildings. During peak electricity periods, the cold energy in the storage tank is released to meet the air conditioning load demand. Programmable logic controllers (PLCs) or simple time controllers are typically used to automatically switch operating modes according to a preset schedule, such as opening or closing valves and main equipment at fixed times, thereby achieving the basic functions of cold storage and release. Some systems are also equipped with basic monitoring interfaces that can display key parameters such as water temperature and liquid level, providing operators with operational status references. This time-based automatic control method reduces the intensity of manual operation to a certain extent and achieves basic electricity cost savings.

[0003] However, the aforementioned existing technologies still face technical challenges in hydraulic coupling when enabling the coordinated operation of open-loop cold storage systems and closed-loop central air conditioning systems. Due to the inherent pressure difference between open and closed systems, when the cold storage pipeline is connected to the central air conditioning main pipeline, directly switching valves can easily generate significant hydraulic shocks at the connection point, leading to drastic pressure fluctuations in the pipeline. These pressure fluctuations can not only cause equipment safety issues such as pump cavitation and valve damage, but also potentially cause localized vaporization in the system, affecting the stable operation of the entire air conditioning system. Furthermore, in the combined cooling mode, the connection of the open-loop cold storage unit will cause a drop in pressure in the main pipeline of the closed system. Existing technologies lack an effective dynamic pressure compensation mechanism, making it difficult to maintain continuous system pressure stability. Summary of the Invention

[0004] In view of the aforementioned existing problems, the present invention is proposed.

[0005] Therefore, this invention provides a solution to the problem of hydraulic shock and system pressure instability caused by pressure imbalance when an open-type cold storage system is connected to a closed-type central air conditioning system.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: In a first aspect, the present invention provides a solution for integrating an open-type cold storage system into a closed-type central air conditioning system, which includes setting an automatic operation mode on the SCADA monitoring unit according to the off-peak, flat and peak electricity price periods published by the State Grid. When the unit time enters the off-peak electricity period, the SCADA monitoring unit automatically executes the cold storage mode command, starts the refrigeration unit and controls the valve to allow 5°C ice water to flow preferentially through the cold storage tank for heat exchange until the outlet water temperature of the cold storage tank reaches the target value. When the unit time enters the power-off period, the SCADA monitoring unit switches to chiller mode according to the timetable instructions, closes the valves of the cold storage tank pipeline, and the unit is completely cooled by the chiller alone. When the unit time enters the peak power period, the SCADA monitoring unit executes the peak power mode command, shuts down the refrigeration unit and opens the valves of the cold storage unit pipeline, and the unit switches to being cooled by the cold storage tank alone; When the SCADA monitoring unit detects that the single cooling supply of the cold storage tank cannot meet the demand of the last order, it starts the combined cooling mode. In the combined cooling mode, the cold storage pump and the original chilled water pump are connected in parallel. The cold storage pump will adjust the input frequency and pressure in real time according to the PID algorithm to keep the water head pressure entering the distributor consistent with the system pressure and avoid water collision. When the cooling system is combined, an electric regulating valve and a self-regulating balancing valve are installed on the main water inlet pipe that branches off to the cold storage tank at the return end. The electric regulating valve is used to regulate the flow rate to the cold storage tank, and the balancing valve is used to ensure the minimum pressure of the closed system and prevent the system from shutting down due to water shortage. The SCADA monitoring unit monitors outdoor temperature and humidity, water tank level, valve status, equipment status, and temperature, pressure, and flow parameters of each key node throughout the entire process, and dynamically optimizes unit energy efficiency based on real-time data.

[0007] As a preferred solution for integrating the open-type cold storage system of the present invention into a closed-type central air conditioning system, the following steps are included: An automatic operation mode is set on the SCADA monitoring unit according to the off-peak, flat, and peak electricity price periods published by the State Grid. When the unit time enters an off-peak period, the SCADA monitoring unit automatically executes the cold storage mode command, starts the refrigeration unit, and controls the valves to allow 5°C chilled water to preferentially flow through the cold storage tank for heat exchange until the outlet water temperature of the cold storage tank reaches the target value: Operators can access the timetable configuration interface in the SCADA monitoring unit and input the specific start and end times of the off-peak, flat, and peak electricity price periods published by the State Grid into the automatic operation mode of the timetable. After the configuration is completed, the automatic operation mode of the timetable becomes the basis for the SCADA monitoring unit to judge the current electricity price period. When the internal clock time of the SCADA monitoring unit enters the off-peak electricity period defined in the automatic operation mode of the schedule, the SCADA monitoring unit immediately generates a cold storage mode command. The cold storage mode command triggers the start-up process of the refrigeration unit. The cold storage mode command is transmitted to the valve control loop, which commands to close the valve directly supplying the air handling unit and open the valve flowing to the cold storage tank, thereby changing the flow direction of the low-temperature refrigerant. Guided by the valve control circuit, the low-temperature refrigerant preferentially flows into the cold storage tank, flows through the heat exchange coil inside the cold storage tank, and exchanges heat with the storage medium inside the cold storage tank. The SCADA monitoring unit continuously reads the liquid level sensor signal and the cold storage tank outlet water temperature sensor signal, compares the real-time liquid level height with the liquid level height target value, and the real-time outlet water temperature with the outlet water temperature target value. When the real-time liquid level height reaches the liquid level height target value and the real-time outlet water temperature reaches the outlet water temperature target value, the SCADA monitoring unit determines that the cold storage tank has completed energy storage and terminates the execution of the cold storage mode command.

[0008] As a preferred solution for integrating the open-type cold storage system of the present invention into a closed-type central air conditioning system, wherein: when the unit time enters the normal power period, the SCADA monitoring unit switches to chiller mode according to the timetable instruction, closes the valves of the cold storage tank pipeline, and the unit is completely cooled by the refrigeration unit alone, including the following steps: When the internal clock time of the SCADA monitoring unit enters the flat power period defined in the automatic operation mode of the schedule, the SCADA monitoring unit immediately generates a chiller mode command. The chiller mode command is sent to the cold storage tank pipeline valve control circuit, commanding to close the cold storage tank pipeline valve to cut off the connection between the cold storage tank and the main pipeline. After the valves in the cold storage tank pipeline are closed, the SCADA monitoring unit maintains the operation of the refrigeration unit, so that all the low-temperature refrigerant flows through the refrigeration unit for cooling and is then directly supplied to the air handling unit, forming a unit that is completely cooled by the refrigeration unit alone.

[0009] As a preferred solution for integrating the open-type cold storage system of the present invention into a closed-type central air conditioning system, the following steps are included: When the unit time enters the peak power period, the SCADA monitoring unit executes the peak power mode command, shuts down the refrigeration unit and opens the valves of the cold storage unit pipeline, and the unit switches to being cooled solely by the cold storage tank: When the internal clock time of the SCADA monitoring unit enters the peak power period defined in the automatic operation mode of the schedule, the SCADA monitoring unit immediately generates and executes a peak power mode command. The peak power mode command sends a shutdown signal to the chiller to stop the operation of the chiller. At the same time, the peak power mode command sends an opening command to the valves of the cold storage unit pipeline to open the valves of the cold storage unit pipeline. The opening of the valves in the cold storage unit pipeline allows the low-temperature refrigerant stored in the cold storage tank to flow into the pipeline. The inflow of the low-temperature refrigerant causes the cold source supply to switch from the refrigeration unit to the cold storage tank, forming a unit that is cooled solely by the cold storage tank.

[0010] As a preferred solution for integrating the open-type cold storage system of the present invention into a closed-type central air conditioning system, the following steps are taken: When the SCADA monitoring unit detects that the single-cooling supply of the cold storage tank cannot meet the demand of the last order, a combined cooling mode is activated. During combined cooling, the cold storage pump and the original chilled water pump are connected in parallel. The cold storage pump will adjust the input frequency and pressure in real time according to the PID algorithm to maintain the head pressure of the water entering the distributor consistent with the system pressure and avoid water collision. The SCADA monitoring unit continuously collects the measured value of the return water temperature of the distributor and compares it with the set value of the return water temperature of the distributor in real time. When the measured value of the return water temperature of the distributor is continuously higher than the set value of the return water temperature of the distributor and reaches the deviation range, the SCADA monitoring unit determines that the cooling tank alone cannot meet the load demand. Based on the determination that the cooling demand cannot be met by the cold storage tank alone, the SCADA monitoring unit automatically generates and issues a command to start the combined cooling mode. The command to start the combined cooling mode is transmitted to the self-regulating pressure balancing valve located after the electric regulating valve, triggering the self-regulating pressure balancing valve to enter the working state. The self-regulating pressure balancing valve, which enters the working state, continuously collects the real-time pressure difference data at the grid connection point between the open cold storage unit and the closed central air conditioning unit through a high-precision pressure sensor based on the built-in PID control algorithm. The self-operated pressure balancing valve inputs the real-time differential pressure data of the grid connection point into the PID control algorithm for calculation. The PID control algorithm compares the real-time differential pressure data of the grid connection point with the zero differential pressure setpoint and calculates the adjustment amount, and outputs the valve opening adjustment signal. The valve opening adjustment signal drives the valve core actuator of the self-regulating pressure balancing valve to move, dynamically adjusting the opening size of the self-regulating pressure balancing valve. The dynamic adjustment of the opening size of the self-regulating pressure balancing valve changes the local resistance of the pipeline, thereby realizing the dynamic adjustment of the real-time pressure difference at the grid connection point between the open cold storage unit and the closed central air conditioning unit, and stabilizing the real-time pressure difference at the grid connection point at zero pressure difference.

[0011] As a preferred solution for integrating the open-type cold storage system described in this invention into a closed-type central air conditioning system, the following steps are included: During combined cooling, an electric regulating valve and a self-regulating balancing valve are installed on the main inlet water pipe branched to the cold storage tank at the return water end. The electric regulating valve regulates the flow rate distributed to the cold storage tank, while the balancing valve ensures the minimum pressure of the closed system, preventing system shutdown due to water shortage. After the self-regulating pressure balancing valve stabilizes the real-time pressure difference at the grid connection point between the open cold storage unit and the closed central air conditioning unit at the zero pressure difference set value, the pressure pre-balance state is established. The pressure pre-balance establishment signal is fed back to the SCADA monitoring unit, and the SCADA monitoring unit then sends a slow opening command to the electric regulating valve. After receiving the opening command, the electric regulating valve gradually increases the valve opening in small increments, increasing by 5% each time; the electric regulating valve opens slowly, the SCADA monitoring unit sends a start command to the refrigeration unit, the refrigeration unit starts running and gradually increases its cooling capacity; The slow opening of the electric regulating valve allows the cold energy from the cold storage tank to gradually flow into the pipeline, while the start-up of the refrigeration unit provides supplementary cold energy, forming a coordinated cooling system between the refrigeration unit and the cold storage tank. Throughout the coordinated cooling process, the self-regulating pressure balancing valve continuously monitors the real-time pressure difference at the grid connection point and dynamically adjusts the valve opening based on the PID control algorithm to absorb pressure fluctuations caused by changes in flow rate and maintain the pressure stability of the closed central air conditioning system.

[0012] As a preferred solution for integrating the open-type cold storage system described in this invention into a closed-type central air conditioning system, the SCADA monitoring unit continuously monitors outdoor temperature and humidity, water tank level, valve status, equipment status, and temperature, pressure, and flow parameters of each key node, and dynamically optimizes unit energy efficiency based on real-time data, including the following steps: The SCADA monitoring unit continuously collects outdoor temperature and humidity data, water tank level data, valve status signals, equipment status signals, and temperature, pressure, and flow parameters of each node through a sensor network distributed on site. The collected outdoor temperature and humidity data, water tank level data, valve status signals, equipment status signals, temperature parameters, pressure parameters, and flow parameters are transmitted to the data processing core of the SCADA monitoring unit for real-time integration and analysis. The integrated outdoor temperature and humidity data, water tank level data, valve status signals, equipment status signals, temperature parameters, pressure parameters, and flow parameters form a complete dataset reflecting the current operating status of the unit. The SCADA monitoring unit's energy efficiency optimization algorithm calls the complete dataset to calculate the current instantaneous energy efficiency index and compares and analyzes it with the energy efficiency target value. Based on the comparative analysis results, the SCADA monitoring unit's energy efficiency optimization algorithm generates optimized control commands, fine-tunes the operating frequency of the chiller, and sends the optimized control commands to the corresponding actuators, which then adjust their operating parameters according to the commands.

[0013] Secondly, the present invention provides an open-type cold storage system integrated into a closed-type central air conditioning system, including a time-series electricity price strategy scheduling module, which sets an automatic operation mode on the SCADA monitoring unit according to the off-peak, flat and peak electricity price time periods published by the State Grid. When the unit time enters the off-peak electricity period, the SCADA monitoring unit automatically executes the cold storage mode command, starts the refrigeration unit and controls the valve to make 5°C ice water flow through the cold storage tank first for heat exchange until the outlet water temperature of the cold storage tank reaches the target value. When the unit time enters the flat power period, the SCADA monitoring unit switches to the chiller mode according to the timetable instructions, closes the valves of the cold storage tank pipeline, and the unit is completely cooled by the chiller alone. When the unit enters the peak power period, the SCADA monitoring unit executes the peak power mode command to shut down the refrigeration unit and open the valves of the cold storage unit pipeline, and the unit switches to being cooled by the cold storage tank alone. The load judgment module activates the combined cooling mode when the SCADA monitoring unit detects that the single cooling supply of the cold storage tank cannot meet the demand of the last order. During combined cooling, the cold storage pump and the original chilled water pump are connected in parallel. The cold storage pump will adjust the input frequency and pressure in real time according to the PID algorithm to keep the water head pressure entering the distributor consistent with the system pressure and avoid water collision. The dynamic balance control module, when combined with cooling, has an electric regulating valve and a self-regulating balancing valve installed on the main water inlet pipe of the cold storage tank at the return end. The electric regulating valve regulates the flow rate to the cold storage tank, and the balancing valve ensures the minimum pressure of the closed system to avoid system shutdown due to water shortage. The intelligent optimization module and SCADA monitoring unit monitor outdoor temperature and humidity, water tank level, valve status, equipment status, and temperature, pressure, and flow parameters of each key node throughout the process, and dynamically optimize unit energy efficiency based on real-time data.

[0014] Thirdly, the present invention provides a computer device including a memory and a processor, wherein the memory stores a computer program, wherein: when the computer program is executed by the processor, it implements any step of the solution for integrating an open cold storage system into a closed central air conditioning system as described in the first aspect of the present invention.

[0015] Fourthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, it implements any step of the solution for integrating an open-type cold storage system into a closed-type central air conditioning system as described in the first aspect of the present invention.

[0016] The beneficial effects of this invention are as follows: By setting an automatic operation mode according to the timetable of off-peak, flat, and peak electricity price periods through the SCADA monitoring unit, intelligent switching between cold storage mode, chiller mode, and cooling mode is realized. When the cold storage tank is insufficient due to the return water temperature deviation of the distributor, the combined cooling mode is activated. The self-regulating pressure balancing valve is used to dynamically adjust the grid voltage difference based on the PID algorithm to achieve pressure pre-balancing. Then, the electric regulating valve is controlled to slowly open and start the chiller to achieve coordinated cooling. By monitoring multi-source parameters throughout the process and calculating instantaneous energy efficiency indicators to dynamically optimize system operation, the problems of hydraulic shock and pressure instability when connecting open and closed systems to the grid are solved, and the system stability and overall energy efficiency are improved. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A flowchart illustrating the solution for integrating an open-type cold storage system into a closed-type central air conditioning system.

[0019] Figure 2 This is a schematic diagram of an open-type cold storage system integrated into a closed-type central air conditioning system. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0023] Reference Figures 1-2 This is one embodiment of the present invention, which provides a solution for integrating an open-type cold storage system into a closed-type central air conditioning system, including the following steps: S1. Set the automatic operation mode of the timetable on the SCADA monitoring unit according to the off-peak, flat and peak electricity price time periods published by the State Grid. When the unit time enters the off-peak electricity period, the SCADA monitoring unit automatically executes the cold storage mode command, starts the chiller and controls the valve to make 5℃ ice water flow through the cold storage tank for heat exchange until the outlet water temperature of the cold storage tank reaches the target value.

[0024] S1.1 The operator brings up the timetable configuration interface in the SCADA monitoring unit, and inputs the specific start and end times of the off-peak electricity price period, flat electricity price period and peak electricity price period published by the State Grid into the automatic operation mode of the timetable. After the configuration is completed, the automatic operation mode of the timetable forms the basis for the SCADA monitoring unit to judge the current electricity price period.

[0025] Furthermore, on the SCADA monitoring unit's operating interface, operators can select the timetable configuration function via touchscreen or mouse. After entering the timetable configuration interface, operators manually input or select the start and end times of the off-peak electricity price period, the flat electricity price period, and the peak electricity price period, as clearly listed in the daily official electricity price period announcements issued by the State Grid, into the corresponding time fields of the automatic timetable operation mode. After all time fields are filled in and confirmed to be correct, operators click the save button on the interface to complete the configuration. At this point, the automatic timetable operation mode is activated and becomes the sole basis for the SCADA monitoring unit's internal clock to determine the current electricity price period.

[0026] S1.2 When the internal clock time of the SCADA monitoring unit enters the off-peak electricity period defined in the automatic operation mode of the schedule, the SCADA monitoring unit immediately generates a cold storage mode command. The cold storage mode command triggers the start-up process of the refrigeration unit. The cold storage mode command is transmitted to the valve control loop, which commands to close the valve directly supplying the air handling unit and open the valve flowing to the cold storage tank, thereby changing the flow direction of the low-temperature refrigerant.

[0027] Furthermore, when the internal clock time of the SCADA monitoring unit is exactly the same as the start time of the off-peak electricity period defined in the automatic operation mode of the schedule, the automatic control logic of the SCADA monitoring unit immediately generates a cold storage mode command containing the execution action. This cold storage mode command first sends a start signal to the controller of the refrigeration unit to trigger the compressor and condenser of the refrigeration unit to start running. At the same time, the cold storage mode command is transmitted to the valve control loop responsible for pipeline switching through the communication bus. After receiving the command, the valve control loop immediately outputs an electrical signal to drive the electric valve directly supplying the air handling unit to close its opening and simultaneously drive the electric valve flowing to the cold storage tank to open its opening. The coordinated action of these two valves completely changes the original flow direction of the low-temperature refrigerant in the pipeline.

[0028] S1.3 Under the guidance of the valve control circuit, the low-temperature refrigerant flows preferentially into the cold storage tank, flows through the heat exchange coil inside the cold storage tank, and exchanges heat with the storage medium inside the cold storage tank. The SCADA monitoring unit continuously reads the liquid level sensor signal and the cold storage tank outlet water temperature sensor signal, and compares the real-time liquid level height with the liquid level height target value and the real-time outlet water temperature with the outlet water temperature target value. When the real-time liquid level height reaches the liquid level height target value and the real-time outlet water temperature reaches the outlet water temperature target value, the SCADA monitoring unit determines that the cold storage tank has completed energy storage and terminates the execution of the cold storage mode command.

[0029] Furthermore, guided by the valve control loop, the cryogenic refrigerant no longer flows to the air handling unit but instead preferentially flows into the inlet pipe of the cold storage tank. After entering the cold storage tank, the refrigerant flows through the multi-layered metal heat exchange coils inside, where it undergoes thorough heat exchange with the pre-stored phase change material or water, thereby transferring and storing cooling capacity. During this process, the SCADA monitoring unit continuously reads the 4-20mA current signal from the liquid level sensor installed on the cold storage tank through the analog input channel and converts it into a liquid level value. Simultaneously, it continuously reads the temperature sensor input channel from the cold storage tank... The PT100 temperature sensor signal at the tank outlet is converted into a temperature value. The SCADA monitoring unit compares the real-time liquid level height with the preset target liquid level height value and the real-time outlet water temperature with the preset target outlet water temperature value. When the real-time liquid level height value is continuously equal to or greater than the target liquid level height value and the real-time outlet water temperature value is continuously equal to or lower than the target outlet water temperature value for more than a stable time period, the SCADA monitoring unit determines that the cold storage tank has completed energy storage and then sends a stop command to the actuator to terminate the continued execution of the cold storage mode command.

[0030] S2. When the unit enters the normal power period, the SCADA monitoring unit switches to the chiller mode according to the timetable instructions, closes the valve of the cold storage tank pipeline, and the unit is completely cooled by the chiller alone.

[0031] S2.1 When the internal clock time of the SCADA monitoring unit enters the flat power period defined in the automatic operation mode of the schedule, the SCADA monitoring unit immediately generates a chiller mode command. The chiller mode command is sent to the cold storage tank pipeline valve control circuit, commanding to close the cold storage tank pipeline valve to cut off the connection between the cold storage tank and the main pipeline.

[0032] Furthermore, when the internal clock time of the SCADA monitoring unit is exactly the same as the start time of the flat power period defined in the automatic operation mode of the schedule, the automatic control logic of the SCADA monitoring unit immediately generates a chiller mode command containing the action to be performed. This chiller mode command is sent to the programmable logic controller of the chilled tank pipeline valve control circuit through the fieldbus communication protocol. After receiving the chiller mode command, the chilled tank pipeline valve control circuit immediately outputs a relay control signal command to drive the chilled tank pipeline valve to close its opening. After the chilled tank pipeline valve performs the closing action, it completely cuts off the fluid connection channel between the chilled tank and the main pipeline.

[0033] S2.2 After the valves in the cold storage tank pipeline are closed, the SCADA monitoring unit maintains the operation of the refrigeration unit, so that all the low-temperature refrigerant flows through the refrigeration unit for cooling and is then directly supplied to the air handling unit, forming a unit that is completely cooled by the refrigeration unit alone.

[0034] Furthermore, after confirming that the valves in the cold storage tank pipeline are completely closed, the SCADA monitoring unit maintains the continuous operation of the compressor and condenser of the refrigeration unit. The refrigeration unit continues to operate, keeping the evaporator at its normal operating temperature. Under the driving force of the pump, the low-temperature refrigerant flows through the evaporator of the refrigeration unit for heat exchange and cooling. The cooled low-temperature refrigerant is then directly transported to the heat exchange coil of the air handling unit through the main pipeline. After exchanging heat with the air in the air handling unit, the low-temperature refrigerant returns to the refrigeration unit to form a complete cycle. During this cycle, the cold storage tank does not participate in heat exchange at all, thus forming a working state in which the unit is completely cooled by the refrigeration unit alone.

[0035] S3. When the unit enters the peak power period, the SCADA monitoring unit executes the peak power mode command, shuts down the refrigeration unit and opens the valves of the cold storage unit pipeline, and the unit switches to being cooled solely by the cold storage tank.

[0036] S3.1 When the internal clock time of the SCADA monitoring unit enters the peak power period defined in the automatic operation mode of the schedule, the SCADA monitoring unit immediately generates and executes a peak power mode command. The peak power mode command sends a shutdown signal to the chiller to stop the operation of the chiller. At the same time, the peak power mode command sends an opening command to the valve of the cold storage unit pipeline to open the valve of the cold storage unit pipeline.

[0037] Furthermore, when the internal clock time of the SCADA monitoring unit is exactly the same as the start time of the peak power period defined in the automatic operation mode of the schedule, the automatic control logic of the SCADA monitoring unit immediately generates and executes a peak power mode instruction containing specific operation commands. This peak power mode instruction first sends a shutdown signal to the controller of the refrigeration unit through the digital output module. The shutdown signal triggers the safety shutdown procedure of the refrigeration unit to stop the compressor and condenser from running. At the same time, the peak power mode instruction sends an opening command to the actuator of the cold storage unit pipeline valve through the analog output channel. The opening command drives the electric actuator of the cold storage unit pipeline valve to rotate to the fully open position.

[0038] S3.2 The opening of the valves in the cold storage unit pipeline allows the low-temperature refrigerant stored in the cold storage tank to flow into the pipeline. The inflow of the low-temperature refrigerant causes the cold source supply to switch from the refrigeration unit to the cold storage tank, forming a unit that is cooled solely by the cold storage tank.

[0039] Furthermore, after the valve of the cold storage unit pipeline is opened to the fully open position, the connection channel between the bottom outlet of the cold storage tank and the main pipeline is completely opened. The low-temperature refrigerant stored in the cold storage tank begins to flow into the main pipeline under the action of gravity and pump suction. The low-temperature refrigerant continues to flow into the main pipeline and mixes with the warmer refrigerant returning from the air handling unit. The mixed low-temperature refrigerant is pumped to the air handling unit to provide cooling capacity. During this process, the refrigeration unit remains completely stopped, and all cooling capacity is provided entirely by the low-temperature refrigerant stored in the cold storage tank, thus forming a working mode in which the unit is cooled solely by the cold storage tank.

[0040] S4. When the SCADA monitoring unit detects that the single cooling supply of the cold storage tank cannot meet the demand of the last order, the combined cooling mode is activated. During combined cooling, the cold storage pump and the original chilled water pump are connected in parallel. The cold storage pump will adjust the input frequency and pressure in real time according to the PID algorithm to keep the water head pressure entering the distributor consistent with the system pressure and avoid water collision.

[0041] S4.1 The SCADA monitoring unit continuously collects the measured value of the return water temperature of the distributor and compares it with the set value of the return water temperature of the distributor in real time. When the measured value of the return water temperature of the distributor is continuously higher than the set value of the return water temperature of the distributor and reaches the deviation range, the SCADA monitoring unit determines that the cooling tank alone cannot meet the load demand.

[0042] Furthermore, the SCADA monitoring unit continuously collects the return water temperature measurement value transmitted by the temperature sensor installed on the distributor through the analog input module, and performs a real-time subtraction operation on the measured value and the distributor return water temperature set value set inside the SCADA monitoring unit to obtain the real-time temperature difference. When the real-time temperature difference is continuously positive and the absolute value exceeds the preset temperature deviation threshold and is maintained for a period of time exceeding the preset duration threshold, the logic judgment unit of the SCADA monitoring unit determines that the cooling tank alone cannot meet the load demand.

[0043] S4.2 Based on the judgment that the cooling supply of the cold storage tank alone cannot meet the load demand, the SCADA monitoring unit automatically generates and issues a command to start the combined cooling mode. The command to start the combined cooling mode is transmitted to the self-regulating pressure balancing valve located after the electric regulating valve, triggering the self-regulating pressure balancing valve to enter the working state. The self-regulating pressure balancing valve, which has entered the working state, continuously collects the real-time pressure difference data of the grid connection point between the open cold storage unit and the closed central air conditioning unit through a high-precision pressure sensor based on the built-in PID control algorithm.

[0044] Furthermore, based on the determination that the cooling demand cannot be met by the cold storage tank alone, the automatic control logic of the SCADA monitoring unit automatically generates and immediately issues a command to start the combined cooling mode via the digital communication bus. The command to start the combined cooling mode is transmitted in the form of an electrical signal to the electronic controller of the self-regulating pressure balancing valve located after the electric regulating valve, triggering the self-regulating pressure balancing valve to enter the working state from the standby state. Once in the working state, the self-regulating pressure balancing valve immediately activates its built-in PID control algorithm based on analog circuits. At the same time, it continuously collects the real-time differential pressure data at the grid connection point between the outlet of the open cold storage unit and the inlet of the closed central air conditioning unit through a high-precision pressure sensor with a precision mechanical connection.

[0045] S4.3 The self-regulating pressure balancing valve inputs the real-time differential pressure data of the grid connection point into the PID control algorithm for calculation. The PID control algorithm compares the real-time differential pressure data of the grid connection point with the zero differential pressure setpoint and calculates the adjustment amount, and outputs the valve opening adjustment signal.

[0046] The valve opening adjustment signal is represented as follows: ; in, This is a valve opening adjustment signal. This is the proportional gain coefficient. This refers to the deviation between the real-time differential pressure data at the grid connection point and the zero differential pressure setpoint. This is the integral gain coefficient. For time variables, The differential gain coefficient, For integration variables, For the time derivative, This is the differential of the deviation.

[0047] Furthermore, the electronic controller of the self-regulating pressure balancing valve uses the real-time differential pressure data of the grid connection point collected by the high-precision pressure sensor as input to the PID control algorithm for analog circuit calculation. The PID control algorithm first compares the real-time differential pressure data of the grid connection point with the zero differential pressure setpoint by subtraction to obtain the real-time differential pressure deviation value. Then, it performs proportional-integral-derivative calculations on the real-time differential pressure deviation value to calculate the precise adjustment amount. Finally, it converts the adjustment amount into a standard valve opening adjustment signal output.

[0048] S4.4 The valve opening adjustment signal drives the valve core actuator of the self-operated pressure balancing valve to move, dynamically adjusting the opening of the self-operated pressure balancing valve. The dynamic adjustment of the opening of the self-operated pressure balancing valve changes the local resistance of the pipeline, thereby realizing the dynamic adjustment of the real-time pressure difference at the grid connection point between the open cold storage unit and the closed central air conditioning unit, and stabilizing the real-time pressure difference at the grid connection point at zero pressure difference.

[0049] Furthermore, the valve opening adjustment signal drives the piezoelectric ceramic actuator or stepper motor inside the self-regulating pressure balancing valve to move. The piezoelectric ceramic actuator or stepper motor precisely displaces according to the signal strength, thereby dynamically adjusting the valve core opening of the self-regulating pressure balancing valve. The dynamic adjustment of the valve opening changes the local frictional resistance when the fluid flows through the valve body. The change in local frictional resistance, in turn, affects the real-time differential pressure at the grid connection point between the open-type cold storage unit and the closed-type central air conditioning unit, thereby achieving closed-loop dynamic adjustment of the real-time differential pressure at the grid connection point, and ultimately stabilizing the real-time differential pressure at the grid connection point near the zero differential pressure setpoint.

[0050] S5. When combined cooling is used, an electric regulating valve and a self-regulating balancing valve are installed on the main water inlet pipe of the cold storage tank at the return end. The electric regulating valve is used to regulate the flow rate to the cold storage tank, and the balancing valve is used to ensure the minimum pressure of the closed system and avoid system shutdown due to water shortage.

[0051] S5.1 After the self-regulating pressure balancing valve stabilizes the real-time pressure difference at the grid connection point between the open cold storage unit and the closed central air conditioning unit at the zero pressure difference setpoint, the pressure pre-balancing state is established. The pressure pre-balancing establishment signal is fed back to the SCADA monitoring unit, and the SCADA monitoring unit then sends a slow opening command to the electric regulating valve.

[0052] Furthermore, after the self-regulating pressure balancing valve continuously adjusts and stabilizes the real-time differential pressure at the grid connection point between the open-type cold storage unit and the closed-type central air conditioning unit near the zero differential pressure setpoint for a period of time, the pressure pre-balance state is confirmed to be established. The electronic controller of the self-regulating pressure balancing valve then feeds back a pressure pre-balance establishment signal to the digital input module of the SCADA monitoring unit. After receiving the pressure pre-balance establishment signal, the SCADA monitoring unit immediately sends a slow opening command to the positioner of the electric regulating valve through the analog output channel.

[0053] S5.2 After receiving the opening command, the electric regulating valve gradually increases the valve opening in small increments, increasing by 5% each time; the electric regulating valve opens slowly, the SCADA monitoring unit sends a start command to the refrigeration unit, the refrigeration unit starts running and gradually increases its cooling capacity.

[0054] Furthermore, after receiving the slow opening command, the electric positioner of the electric regulating valve drives the valve stem to gradually increase the valve opening in small increments, with each increment being 5%. As the electric regulating valve gradually opens in this increment, the SCADA monitoring unit sends a start command to the controller of the refrigeration unit through the relay output module. After receiving the start command, the controller of the refrigeration unit starts the compressor and condenser in sequence and gradually increases the cooling capacity to the set operating condition according to the preset slope.

[0055] S5.3 The slow opening of the electric regulating valve allows the cold energy from the cold storage tank to gradually flow into the pipeline, while the start-up of the refrigeration unit provides supplementary cold energy, forming a coordinated cooling supply between the refrigeration unit and the cold storage tank. During the entire coordinated cooling process, the self-regulating pressure balancing valve continuously monitors the real-time pressure difference at the grid connection point and dynamically adjusts the valve opening based on the PID control algorithm to absorb pressure fluctuations caused by changes in flow rate and maintain the pressure stability of the closed central air conditioning system.

[0056] Furthermore, the slow opening of the electric regulating valve allows the low-temperature refrigerant stored in the cold storage tank to gradually flow into the main pipeline at a controllable flow rate. Simultaneously, the start-up and cooling capacity enhancement of the refrigeration unit provides variable supplementary cooling capacity to the main pipeline. The coordination of these two processes forms a collaborative cooling working mode between the refrigeration unit and the cold storage tank. Throughout the collaborative cooling process, the self-regulating pressure balancing valve continues to monitor the real-time pressure difference changes at the grid connection point through a high-precision pressure sensor. Based on the built-in PID control algorithm, the valve dynamically adjusts its opening degree. By changing the local resistance, it absorbs the pressure fluctuations caused by changes in the opening degree of the electric regulating valve and the start-up and shutdown of the refrigeration unit, thereby maintaining the stability of the closed central air conditioning system pressure.

[0057] The S6 SCADA monitoring unit monitors outdoor temperature and humidity, water tank level, valve status, equipment status, and temperature, pressure, and flow parameters of each key node throughout the entire process, and dynamically optimizes unit energy efficiency based on real-time data.

[0058] S6.1 The SCADA monitoring unit continuously collects outdoor temperature and humidity data, water tank level data, valve status signals, equipment status signals, and temperature, pressure, and flow parameters of each node through a sensor network distributed on site.

[0059] Furthermore, the SCADA monitoring unit continuously collects outdoor temperature and humidity data, water tank level data, valve opening and closing status signals, refrigeration unit and water pump operating status signals, evaporator inlet and outlet temperature parameters, key node pressure parameters, and main pipeline flow parameters through a data acquisition network composed of temperature and humidity sensors, level transmitters, valve limit switches, equipment relay contacts, temperature sensors, pressure transmitters, and flow meters distributed throughout the field. All collected data is transmitted to the data processing core of the SCADA monitoring unit via fieldbus.

[0060] S6.2 The collected outdoor temperature and humidity data, water tank level data, valve status signals, equipment status signals, temperature parameters, pressure parameters, and flow parameters are transmitted to the data processing core of the SCADA monitoring unit for real-time integration and analysis.

[0061] Furthermore, the collected outdoor temperature and humidity data, water tank level data, valve opening and closing status signals, refrigeration unit and water pump operating status signals, evaporator inlet and outlet temperature parameters, key node pressure parameters, and main pipeline flow parameters are time-stamped, converted to uniform units, and validated for data validity in the data processing core of the SCADA monitoring unit, forming a multi-dimensional dataset with time-series correlation.

[0062] S6.3 The integrated outdoor temperature and humidity data, water tank level data, valve status signals, equipment status signals, temperature parameters, pressure parameters, and flow parameters form a complete dataset reflecting the current operating status of the unit; the SCADA monitoring unit's energy efficiency optimization algorithm calls the complete dataset to calculate the current instantaneous energy efficiency index and compares and analyzes it with the energy efficiency target value.

[0063] The current instantaneous energy efficiency index expression is: ; in, This refers to the current instantaneous energy efficiency index. Instantaneous cooling capacity This represents the instantaneous total power consumption.

[0064] Furthermore, the integrated and analyzed outdoor temperature and humidity data, water tank level data, valve opening and closing status signals, refrigeration unit and water pump operating status signals, evaporator inlet and outlet temperature parameters, key node pressure parameters, and main pipeline flow parameters together constitute a complete dataset reflecting the current operating status of the unit. The SCADA monitoring unit's energy efficiency optimization algorithm calls the complete dataset, first calculating the instantaneous cooling capacity based on the evaporator-side flow parameters and inlet and outlet temperature parameters, and simultaneously accumulating the refrigeration unit power consumption and water pump power consumption to obtain the instantaneous total power consumption. Then, it calculates the current instantaneous energy efficiency index and performs difference analysis and trend comparison between this index and the preset energy efficiency target value.

[0065] S6.4 Based on the comparative analysis results, the SCADA monitoring unit's energy efficiency optimization algorithm generates optimized control commands, fine-tunes the operating frequency of the refrigeration unit, and sends the optimized control commands to the corresponding actuators, which then adjust the operating parameters according to the commands.

[0066] Furthermore, based on the comparison and analysis results of the current instantaneous energy efficiency index and the energy efficiency target value, the SCADA monitoring unit's energy efficiency optimization algorithm generates optimized control instructions containing specific adjustment directions, such as instructions to fine-tune the operating frequency of the chiller. These optimized control instructions are sent to the corresponding actuators such as the chiller inverter through the control network, and the actuators precisely adjust the operating parameters according to the instructions.

[0067] This embodiment also provides an open-type cold storage system integrated into a closed-type central air conditioning system, including: a time-series electricity price strategy scheduling module, which sets an automatic operation mode on the SCADA monitoring unit according to the off-peak, flat and peak electricity price time periods published by the State Grid. When the unit time enters the off-peak period, the SCADA monitoring unit automatically executes the cold storage mode command, starts the refrigeration unit and controls the valve to make 5°C ice water flow through the cold storage tank first for heat exchange until the outlet water temperature of the cold storage tank reaches the target value. When the unit time enters the flat power period, the SCADA monitoring unit switches to the chiller mode according to the timetable instructions, closes the valves of the cold storage tank pipeline, and the unit is completely cooled by the chiller alone. When the unit enters the peak power period, the SCADA monitoring unit executes the peak power mode command to shut down the refrigeration unit and open the valves of the cold storage unit pipeline, and the unit switches to being cooled by the cold storage tank alone. The load judgment module activates the combined cooling mode when the SCADA monitoring unit detects that the single cooling supply of the cold storage tank cannot meet the demand of the last order. During combined cooling, the cold storage pump and the original chilled water pump are connected in parallel. The cold storage pump will adjust the input frequency and pressure in real time according to the PID algorithm to keep the water head pressure entering the distributor consistent with the system pressure and avoid water collision. The dynamic balance control module, when combined with cooling, has an electric regulating valve and a self-regulating balancing valve installed on the main water inlet pipe of the cold storage tank at the return end. The electric regulating valve regulates the flow rate to the cold storage tank, and the balancing valve ensures the minimum pressure of the closed system to avoid system shutdown due to water shortage. The intelligent optimization module and SCADA monitoring unit monitor outdoor temperature and humidity, water tank level, valve status, equipment status, and temperature, pressure, and flow parameters of each key node throughout the process, and dynamically optimize unit energy efficiency based on real-time data.

[0068] This embodiment also provides a computer device applicable to the solution of integrating an open-type cold storage system into a closed-type central air conditioning system, comprising: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the solution of integrating an open-type cold storage system into a closed-type central air conditioning system as proposed in the above embodiment.

[0069] The computer device can be a terminal, comprising a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, NFC (Near Field Communication), or other technologies. The display screen can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad on the computer device's casing, or an external keyboard, touchpad, or mouse.

[0070] This embodiment also provides a storage medium storing a computer program, which, when executed by a processor, implements the solution proposed in the above embodiments for integrating an open-loop cold storage system into a closed-loop central air conditioning system. The storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0071] In summary, this invention achieves intelligent switching between cold storage mode, chiller mode, and cooling release mode by setting an automatic operation mode according to the timetable of off-peak, flat, and peak electricity price periods through the SCADA monitoring unit. When the cold storage tank is insufficient due to the return water temperature deviation of the distributor, the combined cooling mode is activated. The self-regulating pressure balancing valve dynamically adjusts the grid voltage difference based on the PID algorithm to achieve pressure pre-balancing. Then, the electric regulating valve is slowly opened and the chiller is started to achieve coordinated cooling. By monitoring multi-source parameters throughout the process and calculating instantaneous energy efficiency indicators to dynamically optimize system operation, the invention solves the problems of hydraulic shock and pressure instability when connecting open and closed systems to the grid, thereby improving system stability and overall energy efficiency.

[0072] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A solution for integrating an open-type cold storage system into a closed-type central air conditioning system, characterized by: This includes setting an automatic operation mode on the SCADA monitoring unit according to the off-peak, flat, and peak electricity price periods published by the State Grid. When the unit time enters the off-peak period, the SCADA monitoring unit automatically executes the cold storage mode command, starts the chiller and controls the valve to allow 5°C ice water to flow first through the cold storage tank for heat exchange until the outlet water temperature of the cold storage tank reaches the target value. When the unit time enters the power-off period, the SCADA monitoring unit switches to chiller mode according to the timetable instructions, closes the valves of the cold storage tank pipeline, and the unit is completely cooled by the chiller alone. When the unit time enters the peak power period, the SCADA monitoring unit executes the peak power mode command, shuts down the refrigeration unit and opens the valves of the cold storage unit pipeline, and the unit switches to being cooled by the cold storage tank alone; When the SCADA monitoring unit detects that the single cooling supply of the cold storage tank cannot meet the demand of the last order, it starts the combined cooling mode. In the combined cooling mode, the cold storage pump and the original chilled water pump are connected in parallel. The cold storage pump will adjust the input frequency and pressure in real time according to the PID algorithm to keep the water head pressure entering the distributor consistent with the system pressure and avoid water collision. When the cooling system is combined, an electric regulating valve and a self-regulating balancing valve are installed on the main water inlet pipe that branches off to the cold storage tank at the return end. The electric regulating valve is used to regulate the flow rate to the cold storage tank, and the balancing valve is used to ensure the minimum pressure of the closed system and prevent the system from shutting down due to water shortage. The SCADA monitoring unit monitors outdoor temperature and humidity, water tank level, valve status, equipment status, and temperature, pressure, and flow parameters of each key node throughout the entire process, and dynamically optimizes unit energy efficiency based on real-time data.

2. The solution for integrating an open-type cold storage system into a closed-type central air conditioning system as described in claim 1, characterized in that: The SCADA monitoring unit is set to an automatic operation mode according to the off-peak, flat, and peak electricity price periods published by the State Grid. When the unit time enters the off-peak period, the SCADA monitoring unit automatically executes the cold storage mode command, starts the chiller, and controls the valves to allow 5°C chilled water to flow preferentially through the cold storage tank for heat exchange until the outlet water temperature of the cold storage tank reaches the target value. This includes the following steps: Operators can access the timetable configuration interface in the SCADA monitoring unit and input the specific start and end times of the off-peak, flat, and peak electricity price periods published by the State Grid into the automatic operation mode of the timetable. After the configuration is completed, the automatic operation mode of the timetable becomes the basis for the SCADA monitoring unit to judge the current electricity price period. When the internal clock time of the SCADA monitoring unit enters the off-peak electricity period defined in the automatic operation mode of the schedule, the SCADA monitoring unit immediately generates a cold storage mode command. The cold storage mode command triggers the start-up process of the refrigeration unit. The cold storage mode command is transmitted to the valve control loop, which commands to close the valve directly supplying the air handling unit and open the valve flowing to the cold storage tank, thereby changing the flow direction of the low-temperature refrigerant. Guided by the valve control circuit, the low-temperature refrigerant preferentially flows into the cold storage tank, flows through the heat exchange coil inside the cold storage tank, and exchanges heat with the storage medium inside the cold storage tank. The SCADA monitoring unit continuously reads the liquid level sensor signal and the cold storage tank outlet water temperature sensor signal, compares the real-time liquid level height with the liquid level height target value, and the real-time outlet water temperature with the outlet water temperature target value. When the real-time liquid level height reaches the liquid level height target value and the real-time outlet water temperature reaches the outlet water temperature target value, the SCADA monitoring unit determines that the cold storage tank has completed energy storage and terminates the execution of the cold storage mode command.

3. The solution for integrating an open-type cold storage system into a closed-type central air conditioning system as described in claim 2, characterized in that: When the unit enters the normal power supply period, the SCADA monitoring unit switches to chiller mode according to the schedule instructions, closes the cold storage tank pipeline valves, and the unit is completely cooled by the chiller unit alone, including the following steps: When the internal clock time of the SCADA monitoring unit enters the flat power period defined in the automatic operation mode of the schedule, the SCADA monitoring unit immediately generates a chiller mode command. The chiller mode command is sent to the cold storage tank pipeline valve control circuit, commanding to close the cold storage tank pipeline valve to cut off the connection between the cold storage tank and the main pipeline. After the valves in the cold storage tank pipeline are closed, the SCADA monitoring unit maintains the operation of the refrigeration unit, so that all the low-temperature refrigerant flows through the refrigeration unit for cooling and is then directly supplied to the air handling unit, forming a unit that is completely cooled by the refrigeration unit alone.

4. The solution for integrating an open-type cold storage system into a closed-type central air conditioning system as described in claim 3, characterized in that: When the unit enters the peak power period, the SCADA monitoring unit executes the peak power mode command, shuts down the chiller and opens the valves in the cold storage unit pipeline, and the unit switches to being cooled solely by the cold storage tank, including the following steps: When the internal clock time of the SCADA monitoring unit enters the peak power period defined in the automatic operation mode of the schedule, the SCADA monitoring unit immediately generates and executes a peak power mode command. The peak power mode command sends a shutdown signal to the chiller to stop the operation of the chiller. At the same time, the peak power mode command sends an opening command to the valves of the cold storage unit pipeline to open the valves of the cold storage unit pipeline. The opening of the valves in the cold storage unit pipeline allows the low-temperature refrigerant stored in the cold storage tank to flow into the pipeline. The inflow of the low-temperature refrigerant causes the cold source supply to switch from the refrigeration unit to the cold storage tank, forming a unit that is cooled solely by the cold storage tank.

5. The solution for integrating an open-type cold storage system into a closed-type central air conditioning system as described in claim 4, characterized in that: When the SCADA monitoring unit detects that the cooling supply from the cold storage tank alone cannot meet the demand of the last order, it activates the combined cooling mode. In combined cooling mode, the cold storage pump and the original chilled water pump are connected in parallel. The cold storage pump will adjust the input frequency and pressure in real time according to the PID algorithm to keep the head pressure of the water entering the distributor consistent with the system pressure and avoid water backflow. This includes the following steps: The SCADA monitoring unit continuously collects the measured value of the return water temperature of the distributor and compares it with the set value of the return water temperature of the distributor in real time. When the measured value of the return water temperature of the distributor is continuously higher than the set value of the return water temperature of the distributor and reaches the deviation range, the SCADA monitoring unit determines that the cooling tank alone cannot meet the load demand. Based on the determination that the cooling demand cannot be met by the cold storage tank alone, the SCADA monitoring unit automatically generates and issues a command to start the combined cooling mode. The command to start the combined cooling mode is transmitted to the self-regulating pressure balancing valve located after the electric regulating valve, triggering the self-regulating pressure balancing valve to enter the working state. The self-regulating pressure balancing valve, which enters the working state, continuously collects the real-time pressure difference data at the grid connection point between the open cold storage unit and the closed central air conditioning unit through a high-precision pressure sensor based on the built-in PID control algorithm. The self-operated pressure balancing valve inputs the real-time differential pressure data of the grid connection point into the PID control algorithm for calculation. The PID control algorithm compares the real-time differential pressure data of the grid connection point with the zero differential pressure setpoint and calculates the adjustment amount, and outputs the valve opening adjustment signal. The valve opening adjustment signal drives the valve core actuator of the self-regulating pressure balancing valve to move, dynamically adjusting the opening size of the self-regulating pressure balancing valve. The dynamic adjustment of the opening size of the self-regulating pressure balancing valve changes the local resistance of the pipeline, thereby realizing the dynamic adjustment of the real-time pressure difference at the grid connection point between the open cold storage unit and the closed central air conditioning unit, and stabilizing the real-time pressure difference at the grid connection point at zero pressure difference.

6. The solution for integrating an open-type cold storage system into a closed-type central air conditioning system as described in claim 5, characterized in that: When using a combined cooling system, an electric regulating valve and a self-regulating balancing valve are installed on the main inlet water pipe that branches off to the cold storage tank at the return end. The electric regulating valve adjusts the flow rate to the cold storage tank, while the balancing valve ensures the minimum pressure of the closed system and prevents system shutdown due to water shortage. This includes the following steps: After the self-regulating pressure balancing valve stabilizes the real-time pressure difference at the grid connection point between the open cold storage unit and the closed central air conditioning unit at the zero pressure difference set value, the pressure pre-balance state is established. The pressure pre-balance establishment signal is fed back to the SCADA monitoring unit, and the SCADA monitoring unit then sends a slow opening command to the electric regulating valve. After receiving the opening command, the electric regulating valve gradually increases the valve opening in small increments, increasing by 5% each time; the electric regulating valve opens slowly, the SCADA monitoring unit sends a start command to the refrigeration unit, the refrigeration unit starts running and gradually increases its cooling capacity; The slow opening of the electric regulating valve allows the cold energy from the cold storage tank to gradually flow into the pipeline, while the start-up of the refrigeration unit provides supplementary cold energy, forming a coordinated cooling system between the refrigeration unit and the cold storage tank. Throughout the coordinated cooling process, the self-regulating pressure balancing valve continuously monitors the real-time pressure difference at the grid connection point and dynamically adjusts the valve opening based on the PID control algorithm to absorb pressure fluctuations caused by changes in flow rate and maintain the pressure stability of the closed central air conditioning system.

7. The solution for integrating an open-type cold storage system into a closed-type central air conditioning system as described in claim 6, characterized in that: The SCADA monitoring unit continuously monitors outdoor temperature and humidity, water tank level, valve status, equipment status, and temperature, pressure, and flow parameters at key nodes. Based on real-time data, it dynamically optimizes unit energy efficiency, including the following steps: The SCADA monitoring unit continuously collects outdoor temperature and humidity data, water tank level data, valve status signals, equipment status signals, and temperature, pressure, and flow parameters of each node through a sensor network distributed on site. The collected outdoor temperature and humidity data, water tank level data, valve status signals, equipment status signals, temperature parameters, pressure parameters, and flow parameters are transmitted to the data processing core of the SCADA monitoring unit for real-time integration and analysis. The integrated outdoor temperature and humidity data, water tank level data, valve status signals, equipment status signals, temperature parameters, pressure parameters, and flow parameters form a complete dataset reflecting the current operating status of the unit. The SCADA monitoring unit's energy efficiency optimization algorithm calls the complete dataset to calculate the current instantaneous energy efficiency index and compares and analyzes it with the energy efficiency target value. Based on the comparative analysis results, the SCADA monitoring unit's energy efficiency optimization algorithm generates optimized control commands, fine-tunes the operating frequency of the chiller, and sends the optimized control commands to the corresponding actuators, which then adjust their operating parameters according to the commands.

8. An open-loop cold storage system integrated into a closed-loop central air conditioning system, based on the solution for integrating an open-loop cold storage system into a closed-loop central air conditioning system as described in any one of claims 1 to 7, characterized in that: This includes a time-series electricity price strategy scheduling module, which sets an automatic operation mode on the SCADA monitoring unit according to the off-peak, flat, and peak electricity price time periods published by the State Grid. When the unit time enters the off-peak period, the SCADA monitoring unit automatically executes the cold storage mode command, starts the chiller and controls the valve to make 5℃ ice water flow through the cold storage tank for heat exchange until the outlet water temperature of the cold storage tank reaches the target value. When the unit time enters the flat power period, the SCADA monitoring unit switches to the chiller mode according to the timetable instructions, closes the valves of the cold storage tank pipeline, and the unit is completely cooled by the chiller alone. When the unit enters the peak power period, the SCADA monitoring unit executes the peak power mode command to shut down the refrigeration unit and open the valves of the cold storage unit pipeline, and the unit switches to being cooled by the cold storage tank alone. The load judgment module activates the combined cooling mode when the SCADA monitoring unit detects that the single cooling supply of the cold storage tank cannot meet the demand of the last order. During combined cooling, the cold storage pump and the original chilled water pump are connected in parallel. The cold storage pump will adjust the input frequency and pressure in real time according to the PID algorithm to keep the water head pressure entering the distributor consistent with the system pressure and avoid water collision. The dynamic balance control module, when combined with cooling, has an electric regulating valve and a self-regulating balancing valve installed on the main water inlet pipe of the cold storage tank at the return end. The electric regulating valve regulates the flow rate to the cold storage tank, and the balancing valve ensures the minimum pressure of the closed system to avoid system shutdown due to water shortage. The intelligent optimization module and SCADA monitoring unit monitor outdoor temperature and humidity, water tank level, valve status, equipment status, and temperature, pressure, and flow parameters of each key node throughout the process, and dynamically optimize unit energy efficiency based on real-time data.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, it implements the steps of the solution for integrating the open-type cold storage system into a closed-type central air conditioning system as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, it implements the steps of the solution for integrating the open cold storage system into a closed central air conditioning system as described in any one of claims 1 to 7.

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