Refrigeration system and control method, device, computer equipment and storage medium thereof

Abstract

Embodiments of the present application relate to a refrigeration system and a control method and device thereof, computer equipment and a storage medium. When the natural cold source parameters meet the preset conditions, the natural cold source is controlled to exchange heat with the air-cooled air conditioning equipment through the first plate heat exchanger, and then the cooled water after heat exchange is input into the second plate heat exchanger, so that the cooled water after heat exchange exchanges heat with the liquid-cooled air conditioning equipment through the second plate heat exchanger. When the natural cold source parameters do not meet the preset conditions, the water chiller is controlled to provide the air-cooled air conditioning equipment with cooling water in a first temperature range, and the first cooling tower is controlled to provide the liquid-cooled air conditioning equipment with cooling water in a second temperature range, and the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment are controlled to be isolated from each other. Thus, the natural cold source can be used to provide cooling capacity for the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment in turn. When the natural cold source is insufficient, different temperature cooling water is provided for the air-cooled and liquid-cooled air conditioners respectively and they are isolated from each other, thereby reducing the energy consumption of the energy-saving refrigeration system and improving the overall energy efficiency of the system.

Description

Technical Field

[0001] This application relates to the field of refrigeration equipment technology, and in particular to a refrigeration system and its control method, apparatus, computer equipment and storage medium. Background Technology

[0002] Currently, air conditioning systems are evolving from a single air-cooling mode to a comprehensive system that combines air cooling and liquid cooling, utilizes multiple cooling sources in synergy, and makes deep utilization of natural cooling sources. In cold northern regions, outdoor low-temperature air or lake water can be used for cooling for extended periods, while in hot and humid southern regions, mechanical refrigeration is required year-round. However, due to the different cooling conditions and flow distribution parameters of air-cooled and liquid-cooled air conditioning systems, existing solutions typically employ two independent systems operating separately. This results in equipment in different systems not being able to provide backup for each other, leading to high initial investment costs. Furthermore, when the two systems are coupled, the low-temperature water from the air-cooled system directly enters the liquid-cooled system, easily causing temperature disturbances and flow mismatches during cooling source switching. Additionally, in scenarios with low cabinet loads, the air conditioning system operates at low loads for extended periods, failing to operate within its optimal energy efficiency range, and wastes cooling capacity due to equipment redundancy requirements.

[0003] Therefore, how to achieve multi-source coordinated cooling while maintaining stable and efficient operation of the refrigeration system, while being compatible with traditional air-cooled and liquid-cooled air conditioning systems, is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] In view of this, in order to solve the above-mentioned technical problems or some of the technical problems, the embodiments of this application provide a refrigeration system and its control method, device, computer equipment and storage medium.

[0005] In a first aspect, embodiments of this application provide a refrigeration system control method, including: Obtain the parameters of the natural cold source corresponding to the refrigeration system; When the natural cold source parameters meet the preset conditions, the refrigeration system is determined to be in natural cold source mode. According to the natural cold source mode, the natural cold source is controlled to exchange heat with the air-cooled air conditioning equipment of the refrigeration system through the first plate heat exchanger. Then, the cooled water after heat exchange is input into the second plate heat exchanger so that the cooled water after heat exchange is exchanged with the liquid-cooled air conditioning equipment of the refrigeration system through the second plate heat exchanger. When the parameters of the natural cold source do not meet the preset conditions, the refrigeration system is determined to be in mechanical refrigeration mode. According to the mechanical refrigeration mode, the chiller unit is controlled to provide cooling water in the first temperature range to the air-cooled air conditioning equipment, and the first cooling tower is controlled to provide cooling water in the second temperature range to the liquid-cooled air conditioning equipment. At the same time, the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment are controlled to be isolated from each other, and the first temperature range is lower than the second temperature range.

[0006] In one possible implementation, after the controlled natural cold source exchanges heat with the air-cooled air conditioning equipment of the refrigeration system through a first plate heat exchanger, the cooled water after heat exchange is input into a second plate heat exchanger, so that the cooled water after heat exchange exchanges heat with the liquid-cooled air conditioning equipment of the refrigeration system through the second plate heat exchanger, including: The first valve between the first plate heat exchanger and the air-cooled air conditioning equipment is opened, and the natural cold source side pipeline is connected to the first plate heat exchanger. The natural cold source is controlled to enter the first plate heat exchanger, and the first return water in the circulation loop of the air-cooled air conditioning equipment is controlled to enter the first plate heat exchanger, so that the first return water and the natural cold source exchange heat in the first plate heat exchanger to obtain the first cooling water after exchanging heat with the first return water. The first cooling water is delivered to the air-cooled air conditioning equipment for heat exchange, resulting in a second cooling water after heat exchange with the first cooling water. The second valve between the circulation loop of the air-cooled air conditioning equipment and the second plate heat exchanger is opened to allow the second cooling water to enter the second plate heat exchanger through the second valve; The third valve between the circulation loop of the liquid-cooled air conditioning equipment and the second plate heat exchanger is opened, so that the second return water in the circulation loop of the liquid-cooled air conditioning equipment enters the second plate heat exchanger through the third valve, so that the second return water exchanges heat with the second cooling water.

[0007] In one possible implementation, the control of the chiller unit to provide cooling water within a first temperature range to the air-cooled air conditioning equipment, and the control of the first cooling tower to provide cooling water within a second temperature range to the liquid-cooled air conditioning equipment, while simultaneously controlling the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment to be isolated from each other, includes: The fourth valve between the chiller unit and the circulation loop of the air-cooled air conditioning equipment is opened, so that the chiller unit outputs cooling water in the first temperature range to the circulation loop of the air-cooled air conditioning equipment. The chiller unit is connected to the second cooling tower to obtain cooling water. Control the connection of the water supply pipeline between the first cooling tower and the liquid-cooled air conditioning equipment, so that the first cooling tower outputs cooling water in the second temperature range to the circulation loop of the liquid-cooled air conditioning equipment; The second and third valves are controlled to close, so that the circulation loop of the air-cooled air conditioning unit is isolated from the circulation loop of the liquid-cooled air conditioning unit.

[0008] In one possible implementation, after the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment are isolated from each other, the method further includes: The fifth valve in the circulation loop of the air-cooled air conditioning unit is opened, and the sixth valve in the circulation loop of the liquid-cooled air conditioning unit is opened. The fifth valve is used to input cooling water in the first temperature range provided by the chiller unit into the air-cooled air conditioning unit, and the sixth valve is used to input cooling water in the second temperature range provided by the first cooling tower into the liquid-cooled air conditioning unit.

[0009] In one possible implementation, the method further includes: In the mechanical refrigeration mode, when the inlet water temperature of the liquid-cooled air conditioning equipment is detected to be higher than the preset temperature, the system is determined to be in the plate heat exchanger supplementary cooling mode, and the second valve and the third valve are controlled to open according to the plate heat exchanger supplementary cooling mode; The cooling water after heat exchange with the air-cooled air conditioning equipment is fed into the second plate heat exchanger through the second valve, and the cooling water output from the first cooling tower is fed into the second plate heat exchanger through the third valve, so that the cooling water output from the first cooling tower exchanges heat with the cooling water after heat exchange with the air-cooled air conditioning equipment, and is then output to the liquid-cooled air conditioning equipment.

[0010] In one possible implementation, the method further includes: In the plate heat exchanger cooling mode, the inlet water temperature of the liquid-cooled air conditioning equipment is obtained, and the temperature deviation between the inlet water temperature and the preset temperature is calculated. The opening of the fifth valve and the sixth valve are adjusted based on the temperature deviation to regulate the flow rate of the cooling water entering the second plate heat exchanger after heat exchange with the air-cooled air conditioning equipment and the cooling water output from the first cooling tower. The flow rate is positively correlated with the temperature deviation.

[0011] Secondly, embodiments of this application provide a refrigeration system for implementing the method of claim 1, the system comprising: a natural cold source side loop, a chiller unit, a first cooling tower, an air-cooled air conditioning unit, a liquid-cooled air conditioning unit, a first plate heat exchanger, a second plate heat exchanger, multiple valve assemblies, and a control unit; The first end and the second end of the first plate heat exchanger are connected to the natural cold source side loop, the third end of the first plate heat exchanger is connected to the first end of the air-cooled air conditioning equipment through a loop-type supply and return main pipe, and the fourth end of the first plate heat exchanger is connected to the second end of the second plate heat exchanger through the loop-type supply and return main pipe. The first end of the second plate heat exchanger is connected to the second end of the air-cooled air conditioning equipment, the third end of the second plate heat exchanger is connected to the first end of the liquid-cooled air conditioning equipment, and the fourth end of the second plate heat exchanger is connected to the first end of the first cooling tower. The first end of the chiller unit is connected to the first end of the air-cooled air conditioning equipment through the loop-type supply and return main pipe, the second end of the chiller unit is connected to the second end of the second plate heat exchanger through the loop-type supply and return main pipe, and the second end of the first cooling tower is connected to the second end of the liquid-cooled air conditioning equipment. Multiple valve assemblies are respectively disposed between: the second end of the air-cooled air conditioning unit and the first end of the second plate heat exchanger; between the first end of the first cooling tower and the fourth end of the second plate heat exchanger; between the second end of the air-cooled air conditioning unit and the second end of the second plate heat exchanger; between the first end of the liquid-cooled air conditioning unit and the first end of the first cooling tower; between the third end of the first plate heat exchanger and the loop-type supply and return main pipe; and between the first end of the chiller unit and the loop-type supply and return main pipe. The control unit is connected to the natural cold source side circuit, the chiller unit, the first cooling tower and the valve assembly respectively, and is used to control the system to switch between different modes.

[0012] Thirdly, embodiments of this application provide a refrigeration system control device, comprising: The acquisition module is used to acquire the natural cold source parameters corresponding to the refrigeration system; The first control module is used to determine that the refrigeration system is in natural cold source mode when the natural cold source parameters meet the preset conditions, and to control the natural cold source to exchange heat with the air-cooled air conditioning equipment of the refrigeration system through the first plate heat exchanger according to the natural cold source mode, and then input the cooled water after heat exchange into the second plate heat exchanger so that the cooled water after heat exchange can exchange heat with the liquid-cooled air conditioning equipment of the refrigeration system through the second plate heat exchanger. The second control module is used to determine that the refrigeration system is in mechanical refrigeration mode when the parameters of the natural cold source do not meet the preset conditions, and to control the chiller unit to provide cooling water in the first temperature range to the air-cooled air conditioning equipment and to control the first cooling tower to provide cooling water in the second temperature range to the liquid-cooled air conditioning equipment according to the mechanical refrigeration mode, while controlling the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment to be isolated from each other, and the first temperature range is lower than the second temperature range.

[0013] Fourthly, embodiments of this application provide a computer device, including: a processor and a memory, wherein the processor is configured to execute a refrigeration system control program stored in the memory to implement the refrigeration system control method described in any one of the first aspects above.

[0014] Fifthly, embodiments of this application provide a storage medium storing one or more programs, which can be executed by one or more processors to implement the refrigeration system control method described in any one of the first aspects.

[0015] The refrigeration system control scheme provided in this application obtains the natural cold source parameters corresponding to the refrigeration system. When the natural cold source parameters meet the preset conditions, the refrigeration system is determined to be in natural cold source mode. According to the natural cold source mode, the natural cold source is controlled to exchange heat with the air-cooled air conditioning equipment of the refrigeration system through the first plate heat exchanger, and then the cooled water after heat exchange is input into the second plate heat exchanger so that the cooled water after heat exchange is exchanged heat with the liquid-cooled air conditioning equipment of the refrigeration system through the second plate heat exchanger. When the natural cold source parameters do not meet the preset conditions, the refrigeration system is determined to be in mechanical refrigeration mode. According to the mechanical refrigeration mode, the chiller unit is controlled to provide cooling water of the first temperature range to the air-cooled air conditioning equipment, and the first cooling tower is controlled to provide cooling water of the second temperature range to the liquid-cooled air conditioning equipment. At the same time, the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment are controlled to be isolated from each other, and the first temperature range is lower than the second temperature range. Therefore, the system can automatically switch between natural cooling source mode and mechanical refrigeration mode based on the parameters of the natural cooling source. When the natural cooling source is sufficient, it is prioritized to provide cooling capacity to the air-cooled and liquid-cooled air conditioning equipment through a two-stage plate heat exchanger, achieving tiered utilization of cooling capacity and maximizing the utilization of the natural cooling source. When the natural cooling source is insufficient, it switches to mechanical refrigeration mode, and the chiller and cooling tower provide cooling water with different temperature ranges for the air-cooled and liquid-cooled air conditioning equipment respectively, while keeping them isolated from each other. This ensures that the cooling needs of the two types of air conditioning equipment are met under different operating conditions, while avoiding temperature disturbances and flow mismatch problems, thereby significantly reducing mechanical refrigeration energy consumption and improving the overall energy efficiency of the system. Attached Figure Description

[0016] Figure 1 A flowchart illustrating a refrigeration system control method provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a refrigeration system provided in an embodiment of this application; Figure 3 This is a schematic diagram of another refrigeration system provided in an embodiment of this application; Figure 4 This is a schematic diagram of another refrigeration system provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of a refrigeration system control device provided in an embodiment of this application; Figure 6 This is a schematic diagram of the structure of a computer device provided in an embodiment of this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] To facilitate understanding of the embodiments of this application, the following will provide further explanation and description with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of this application.

[0019] Figure 1 A flowchart illustrating a refrigeration system control method provided in this application embodiment is shown below. Figure 1 As shown, the method specifically includes: S11. Obtain the parameters of the natural cold source corresponding to the refrigeration system.

[0020] The cooling system control method provided in this application is mainly applied to data center cooling systems that simultaneously deploy air-cooled and liquid-cooled air conditioners. It is particularly suitable for high-power-density computer rooms, data centers built in phases, and green data centers that can utilize natural cold sources such as lake water or low-temperature outdoor air. The cooling system automatically switches between natural cold source mode, mechanical cooling mode, and plate heat exchanger supplementary cooling mode based on natural cold source parameters to exchange heat with the air conditioning equipment in different ways. This achieves tiered utilization of cooling capacity and coordinated cooling from multiple cold sources, meeting the stable operation requirements under different load conditions.

[0021] The executing entity is a computer device, including but not limited to an industrial controller, embedded microcontroller, or server. The computer device is connected to the valve assembly, chiller, cooling tower, and temperature sensor in the refrigeration system. The computer device is configured to acquire natural cold source parameters and liquid-cooled air conditioning inlet water temperature, automatically switch refrigeration modes according to preset conditions, and achieve coordinated control of prioritizing the use of natural cold source and isolating or series-connecting air-cooled and liquid-cooled circuits for supplemental cooling by controlling the opening and closing of valves and the start and stop of equipment.

[0022] The refrigeration system is a comprehensive cooling system used to provide heat dissipation services, including at least air-cooled air conditioning equipment, liquid-cooled air conditioning equipment, a first plate heat exchanger, a second plate heat exchanger, a chiller unit, a cooling tower, and a control unit. Air-cooled air conditioning equipment is used to cool the air in the target environment, while liquid-cooled air conditioning equipment is used to cool heat-generating equipment; both have internal circulating water loops.

[0023] In this embodiment, a temperature sensor and a flow sensor are installed on the pipeline on the natural cold source side. The temperature sensor and the flow sensor are respectively connected to a computer device for communication. The computer device collects the current temperature value of the natural cold source in real time through the temperature sensor and the current flow value of the natural cold source through the flow sensor. The natural cold source parameters refer to a set of physical quantities used to characterize the availability of natural cooling resources, including one or more of the following: temperature, flow rate, heat capacity, and ambient wet-bulb temperature of the natural cold source. The natural cold source refers to any one of the following low-temperature media: outdoor low-temperature air, lake water, river water, deep well water, soil source, or industrial waste heat recovery medium.

[0024] Furthermore, the computer equipment compares the collected natural cooling source parameters with preset conditions to determine whether the conditions for entering the natural cooling source mode are met. The preset conditions refer to the pre-set criteria for determining whether to enable the natural cooling source mode, including one or more combinations of the following: the natural cooling source temperature is lower than the return water temperature of the air-cooled air conditioning equipment, the natural cooling source temperature is lower than a set threshold, or the natural cooling source flow rate is greater than the minimum required flow rate.

[0025] S12. When the natural cold source parameters meet the preset conditions, the refrigeration system is determined to be in the natural cold source mode. According to the natural cold source mode, the natural cold source is controlled to exchange heat with the air-cooled air conditioning equipment of the refrigeration system through the first plate heat exchanger. Then, the cooled water after heat exchange is input into the second plate heat exchanger so that the cooled water after heat exchange is exchanged with the liquid-cooled air conditioning equipment of the refrigeration system through the second plate heat exchanger.

[0026] In this embodiment, when the natural cold source parameters meet preset conditions, the refrigeration system is determined to be in natural cold source mode. The control unit controls each loop and valve component in the system to establish a heat exchange path for the natural cold source to sequentially provide cooling capacity to the air-cooled air conditioning unit and the liquid-cooled air conditioning unit. First, the natural cold source side pipeline is opened, allowing the cooling water corresponding to the natural cold source to enter the first plate heat exchanger. Simultaneously, the circulating water loop of the air-cooled air conditioning unit is controlled to operate, allowing the return water of the air-cooled air conditioning unit to enter the first plate heat exchanger. In the first plate heat exchanger, the cooling water of the natural cold source exchanges heat with the return water of the air-cooled air conditioning unit, thereby reducing the temperature of the return water and obtaining cooled water. Then, the cooled water is sent to the air-cooled air conditioning equipment for heat exchange, and the cooled water with increased temperature is obtained after heat exchange. Furthermore, the connection path between the air-cooled air conditioning unit and the second plate heat exchanger is controlled to be open, so that the cooling water after heat exchange by the air-cooled air conditioning unit enters the second plate heat exchanger; at the same time, the operation of the circulating water loop of the liquid-cooled air conditioning unit is controlled, so that the return water of the liquid-cooled air conditioning unit enters the second plate heat exchanger. Inside the second plate heat exchanger, the cooling water from the air-cooled air conditioning unit exchanges heat with the return water from the liquid-cooled air conditioning unit, thereby reducing the temperature of the return water from the liquid-cooled air conditioning unit and sending the cooled water back to the circulating water loop of the liquid-cooled air conditioning unit. Through the above process, a continuous heat exchange process is achieved where the natural cold source cools the air-cooled air conditioning unit through the first plate heat exchanger and then cools the liquid-cooled air conditioning unit through the second plate heat exchanger.

[0027] In one possible implementation, the first valve between the first plate heat exchanger and the air-cooled air conditioning unit is opened, and the natural cold source side pipeline is connected to the first plate heat exchanger; the natural cold source is controlled to enter the first plate heat exchanger, and simultaneously the first return water in the circulation loop of the air-cooled air conditioning unit is controlled to enter the first plate heat exchanger, so that the first return water and the natural cold source exchange heat in the first plate heat exchanger to obtain first cooling water after heat exchange with the first return water; the first cooling water is transported to the air-cooled air conditioning unit for heat exchange to obtain second cooling water after heat exchange with the first cooling water; the second valve between the circulation loop of the air-cooled air conditioning unit and the second plate heat exchanger is opened, so that the second cooling water enters the second plate heat exchanger through the second valve; the third valve between the circulation loop of the liquid-cooled air conditioning unit and the second plate heat exchanger is opened, so that the second return water in the circulation loop of the liquid-cooled air conditioning unit enters the second plate heat exchanger through the third valve, so that the second return water exchanges heat with the second cooling water.

[0028] In this embodiment, under natural cooling source mode, the control unit establishes a heat exchange path by interlocking the valve assembly and each circulation loop to sequentially transfer cooling capacity from the natural cooling source to the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment. Wherein: The first valve, the second valve, and the third valve are used to control the connection or isolation between different circuits, respectively; the first return water is the return cooling water of the air-cooled air conditioning equipment after completing one heat exchange; the second return water is the return cooling water of the liquid-cooled air conditioning equipment after completing one heat exchange; the first cooling water is the cooling water of the first return water after cooling in the first plate heat exchanger; the second cooling water is the cooling water of the first cooling water after heat exchange again in the air-cooled air conditioning equipment.

[0029] First, the control unit issues a control command to open the first valve and connect the natural cold source side pipeline, allowing the natural cold source to enter the first plate heat exchanger; at the same time, it controls the operation of the circulating water pump of the air-cooled air conditioning equipment, so that the first return water generated by the air-cooled air conditioning equipment enters the first plate heat exchanger. In the first plate heat exchanger, the first return water exchanges heat with the natural cold source, thereby reducing the temperature of the first return water and forming the first cooling water. Subsequently, the first cooling water is delivered to the air-cooled air conditioning equipment for heat exchange of the target environment. After completing the heat exchange, the air-cooled air conditioning equipment converts the first cooling water into a second cooling water with a higher temperature and outputs it in its circulation loop. Next, the control unit opens the second valve to create a connection between the air-cooled air conditioning unit's circulation loop and the second plate heat exchanger, allowing the second cooling water to enter the second plate heat exchanger. At the same time, the control unit opens the third valve and controls the circulating water pump of the liquid-cooled air conditioning unit to run, allowing the second return water generated by the liquid-cooled air conditioning unit to enter the second plate heat exchanger. Inside the second plate heat exchanger, the second cooling water exchanges heat with the second return water, thereby reducing the temperature of the second return water. The cooled water is then transported back to the circulation loop of the liquid-cooled air conditioning equipment to achieve continuous cooling for the liquid-cooled air conditioning equipment.

[0030] Through the above control process, a continuous heat exchange process is achieved, in which the natural cold source cools the air-cooled air conditioning equipment through the first plate heat exchanger, and then cools the liquid-cooled air conditioning equipment through the second plate heat exchanger.

[0031] S13. When the parameters of the natural cold source do not meet the preset conditions, the refrigeration system is determined to be in mechanical refrigeration mode. According to the mechanical refrigeration mode, the chiller unit is controlled to provide cooling water in the first temperature range to the air-cooled air conditioning equipment, and the first cooling tower is controlled to provide cooling water in the second temperature range to the liquid-cooled air conditioning equipment. At the same time, the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment are isolated from each other, and the first temperature range is lower than the second temperature range.

[0032] In this embodiment, the parameters of the natural cold source do not meet the preset conditions, specifically referring to the fact that the cooling capacity provided by the natural cold source is insufficient to meet the cooling demand of the system, including but not limited to: the water supply temperature corresponding to the natural cold source is higher than the preset temperature threshold, the water supply flow rate is lower than the preset flow rate threshold, or the cooling capacity provided by the natural cold source cannot meet the heat exchange demand of the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment.

[0033] In the aforementioned situation, if natural cooling sources are still used for heat exchange, the inlet water temperature of either the air-cooled or liquid-cooled air conditioning equipment will be too high, failing to meet the target cooling requirements. Therefore, it is necessary to switch to mechanical cooling mode. Mechanical cooling mode refers to an operating mode that provides cooling capacity through active cooling equipment. In this mode, the chiller unit generates low-temperature cooling water for cooling the air-cooled air conditioning equipment, while the first cooling tower provides higher-temperature cooling water for cooling the liquid-cooled air conditioning equipment. Valves control isolate the corresponding circulation loops of the air-cooled and liquid-cooled air conditioning equipment, allowing them to be cooled by independent cooling sources. By entering mechanical cooling mode, when natural cooling sources cannot meet the cooling demands, the active cooling capacity of the chiller unit and cooling tower ensures a stable supply of cooling water for both the air-cooled and liquid-cooled air conditioning equipment, thus maintaining the normal operation of the system.

[0034] After determining that the refrigeration system is in mechanical refrigeration mode, the control unit, through coordinated control of the chiller unit, the first cooling tower, and valve components, ensures that the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment are supplied with independent cold sources, while maintaining mutual isolation between them. Specifically: The first temperature range is the temperature range corresponding to the lower temperature cooling water output by the chiller unit; the second temperature range is the temperature range corresponding to the higher temperature cooling water output by the first cooling tower; both air-cooled air conditioning equipment and liquid-cooled air conditioning equipment are equipped with their own independent circulating water circuits.

[0035] First, the control unit starts the chiller unit and controls the chiller unit to deliver cooling water to the corresponding circulation loop of the air-cooled air conditioning equipment, so that the cooling water entering the air-cooled air conditioning equipment is within the first temperature range; the air-cooled air conditioning equipment uses the cooling water to exchange heat with the target environment, and after heat exchange, it forms return water with increased temperature, which circulates in its circulation loop. At the same time, the control unit starts the first cooling tower and controls the first cooling tower to deliver cooling water to the corresponding circulation loop of the liquid-cooled air conditioning equipment, so that the cooling water entering the liquid-cooled air conditioning equipment is within the second temperature range; the liquid-cooled air conditioning equipment uses the cooling water for heat exchange, and after heat exchange, it forms return water with increased temperature, which circulates in its circulation loop. Furthermore, the control unit controls the second valve located between the air-cooled air conditioning unit and the second plate heat exchanger, and the third valve located between the liquid-cooled air conditioning unit and the second plate heat exchanger, so that the second valve and the third valve are closed, thereby cutting off the connection path between the circulation loop of the air-cooled air conditioning unit and the circulation loop of the liquid-cooled air conditioning unit, so that the cooling water or return water in the two circulation loops does not enter the second plate heat exchanger, thus achieving hydraulic isolation between the two. Through the above control, the chiller unit and the first cooling tower independently provide cooling water of different temperature ranges to the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment, respectively, and avoid coupling or mutual influence between the two circuits, thereby ensuring that their respective cooling needs are stably met.

[0036] In one possible implementation, the fourth valve between the chiller unit and the circulation loop of the air-cooled air conditioning unit is opened, allowing the chiller unit to output cooling water within a first temperature range to the circulation loop of the air-cooled air conditioning unit. The chiller unit is connected to a second cooling tower to obtain cooling water. The water supply pipeline between the first cooling tower and the liquid-cooled air conditioning unit is connected, allowing the first cooling tower to output cooling water within a second temperature range to the circulation loop of the liquid-cooled air conditioning unit. The second and third valves are closed to isolate the circulation loops of the air-cooled air conditioning unit and the liquid-cooled air conditioning unit from each other.

[0037] In this embodiment, the fourth valve is used to control the connection between the chiller unit and the air-cooled air conditioning equipment circulation loop; the second valve and the third valve are used to control the connection or isolation between the air-cooled air conditioning equipment circulation loop and the second plate heat exchanger, and between the liquid-cooled air conditioning equipment circulation loop and the second plate heat exchanger, respectively.

[0038] First, the control unit issues a control command to open the fourth valve and start the chiller unit, so that the cooling water output by the chiller unit enters the circulation loop of the air-cooled air conditioning equipment through the fourth valve, thereby keeping the cooling water entering the air-cooled air conditioning equipment within the first temperature range; the air-cooled air conditioning equipment uses this cooling water for heat exchange, and after heat exchange, it forms return water with a higher temperature, which circulates in its circulation loop; at the same time, the chiller unit is connected to the second cooling tower, which dissipates heat from the chiller unit to maintain the chiller unit's continuous cooling capacity; Secondly, the control unit controls the connection of the water supply pipeline between the first cooling tower and the liquid-cooled air conditioning unit, and starts the first cooling tower, allowing the cooling water output from the first cooling tower to enter the circulation loop of the liquid-cooled air conditioning unit, thus ensuring that the cooling water entering the liquid-cooled air conditioning unit is within the second temperature range. The liquid-cooled air conditioning unit uses this cooling water to exchange heat with the heat-generating equipment, and after heat exchange, it forms return water with a higher temperature, which circulates in its circulation loop. Finally, the control unit closes the second and third valves, cutting off the connection between the circulation loop of the air-cooled air conditioning unit and the second plate heat exchanger, as well as between the circulation loop of the liquid-cooled air conditioning unit and the second plate heat exchanger, thereby preventing heat exchange between the air-cooled and liquid-cooled air conditioning units through the second plate heat exchanger and achieving mutual isolation between the two circulation loops.

[0039] Through the above control process, the chiller unit and the first cooling tower provide cooling water with different temperature ranges to the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment respectively, and ensure that the two circuits operate independently, thereby maintaining the system's stable cooling capacity when the natural cooling source is unavailable.

[0040] In one possible implementation, after isolating the air-cooled air conditioning unit from the liquid-cooled air conditioning unit, the method further includes: The fifth valve in the circulation loop of the air-cooled air conditioning unit is opened, and the sixth valve in the circulation loop of the liquid-cooled air conditioning unit is opened. The fifth valve is used to input cooling water in the first temperature range provided by the chiller unit into the air-cooled air conditioning unit, and the sixth valve is used to input cooling water in the second temperature range provided by the first cooling tower into the liquid-cooled air conditioning unit.

[0041] In this embodiment, the fifth valve is installed in the circulation loop of the air-cooled air conditioning equipment to control the water supply path connection between the chiller unit and the air-cooled air conditioning equipment; the sixth valve is installed in the circulation loop of the liquid-cooled air conditioning equipment to control the water supply path connection between the first cooling tower and the liquid-cooled air conditioning equipment.

[0042] The control unit issues a control command to open the fifth valve and start the chiller unit, so that the cooling water output by the chiller unit enters the circulation loop of the air-cooled air conditioning equipment through the fifth valve, thereby keeping the cooling water entering the air-cooled air conditioning equipment within the first temperature range; the air-cooled air conditioning equipment uses this cooling water to exchange heat with the target environment, and after heat exchange, it forms return water with increased temperature, which circulates in its circulation loop. At the same time, the control unit issues a control command to open the sixth valve and start the first cooling tower, so that the cooling water output from the first cooling tower enters the circulation loop of the liquid-cooled air conditioning equipment through the sixth valve, thereby keeping the cooling water entering the liquid-cooled air conditioning equipment within the second temperature range; the liquid-cooled air conditioning equipment uses this cooling water to exchange heat with the heat-generating equipment, and after heat exchange, it forms return water with increased temperature, which circulates in its circulation loop.

[0043] In one possible implementation, in mechanical refrigeration mode, when the inlet water temperature of the liquid-cooled air conditioning equipment is detected to be higher than the preset temperature, the system is determined to be in plate heat exchanger supplementary cooling mode, and the second valve and the third valve are controlled to open according to the plate heat exchanger supplementary cooling mode; the cooling water after heat exchange with the air-cooled air conditioning equipment is input into the second plate heat exchanger through the second valve, and the cooling water output from the first cooling tower is input into the second plate heat exchanger through the third valve, so that the cooling water output from the first cooling tower and the cooling water after heat exchange with the air-cooled air conditioning equipment are heat exchanged before being output to the liquid-cooled air conditioning equipment.

[0044] In this embodiment, during mechanical refrigeration mode operation, when the inlet water temperature of the liquid-cooled air conditioning unit is detected to be higher than a preset temperature threshold, the control unit determines that the cooling capacity currently provided by the first cooling tower is insufficient to meet the cooling demand of the liquid-cooled air conditioning unit, thereby switching the system from mechanical refrigeration mode to plate heat exchanger supplementary cooling mode. Specifically: the second valve is located between the air-cooled air conditioning unit's circulation loop and the second plate heat exchanger, used to control the flow of cooling water from the air-cooled air conditioning unit into the second plate heat exchanger; the third valve is located between the first cooling tower and the second plate heat exchanger, used to control the flow of cooling water from the first cooling tower into the second plate heat exchanger; the inlet water temperature is the temperature of the cooling water before it enters the liquid-cooled air conditioning unit.

[0045] First, the control unit issues a control command to switch the second and third valves from the closed state to the open state, thereby establishing a connection between the air-cooled air conditioning unit's circulation loop and the water supply path on the first cooling tower side at the second plate heat exchanger. Then, the control unit keeps the air-cooled air conditioning unit's circulation loop running, allowing the cooling water output from the air-cooled air conditioning unit after heat exchange to enter the second plate heat exchanger via the second valve. Simultaneously, the control unit keeps the first cooling tower running, allowing its output cooling water to enter the second plate heat exchanger via the third valve. Inside the second plate heat exchanger, the cooling water from the air-cooled air conditioning unit and the cooling water from the first cooling tower exchange heat in isolated channels, thereby reducing the temperature of the cooling water supplied by the first cooling tower. Finally, the cooled water from the second plate heat exchanger is transported to the circulation loop of the liquid-cooled air conditioning unit as its inlet water for heat exchange, and after heat exchange, it forms return water to continue circulating.

[0046] Through the above control process, when the cooling capacity of the first cooling tower is insufficient, cooling water from the air-cooled air conditioning equipment side is introduced as an auxiliary cold source, which is then used to supplement the cooling of the liquid-cooled air conditioning equipment via the second plate heat exchanger, thereby improving the overall cooling capacity.

[0047] In one possible implementation, in the plate heat exchanger supplemental cooling mode, the inlet water temperature of the liquid-cooled air conditioning equipment is obtained, and the temperature deviation between the inlet water temperature and the preset temperature is calculated; based on the temperature deviation, the opening of the fifth valve and the sixth valve are adjusted to adjust the flow rate of the cooling water entering the second plate heat exchanger after heat exchange with the air-cooled air conditioning equipment and the cooling water output from the first cooling tower, and the flow rate is positively correlated with the temperature deviation.

[0048] In this embodiment, under the plate heat exchanger supplementary cooling mode, the control unit adjusts the flow rates of the two cooling water streams entering the second plate heat exchanger by real-time monitoring and feedback control of the inlet water temperature of the liquid-cooled air conditioning equipment, so as to achieve dynamic matching of the supplementary cooling capacity. Wherein: the inlet water temperature is the temperature of the cooling water before it enters the liquid-cooled air conditioning equipment; the temperature deviation is the difference between the inlet water temperature and the preset temperature (this embodiment's steps are typically performed when the inlet water temperature is greater than the preset temperature).

[0049] The fifth valve is used to regulate the flow rate of cooling water from the air-cooled air conditioning unit in its circulation loop. When the fifth valve is open, the cooling water from the air-cooled air conditioning unit is divided into two branches: one flows through the fifth valve, and the other flows through the second valve into the second plate heat exchanger. The cooling water flowing out of the second plate heat exchanger then merges with the cooling water that passed through the fifth valve into a single flow path, entering the circulation loop of the air-cooled air conditioning unit for heat exchange. When the fifth valve is closed, all the cooling water from the air-cooled air conditioning unit flows through the second valve into the second plate heat exchanger. When the opening of the fifth valve increases, the flow rate of cooling water from the air-cooled air conditioning unit into the second plate heat exchanger decreases; conversely, when the opening of the fifth valve decreases, the flow rate of cooling water from the air-cooled air conditioning unit into the second plate heat exchanger increases.

[0050] The sixth valve is used to regulate the flow rate of cooling water from the first cooling tower in the circulation loop of the liquid-cooled air conditioning unit. When the sixth valve is open, the cooling water from the first cooling tower is divided into two branches, flowing through the sixth valve and then through the third valve into the second plate heat exchanger. The cooling water flowing out of the second plate heat exchanger merges with the cooling water that passed through the sixth valve into a single flow path, entering the circulation loop of the liquid-cooled air conditioning unit for heat exchange. When the sixth valve is closed, all the cooling water from the first cooling tower flows through the third valve into the second plate heat exchanger. When the opening of the sixth valve increases, the flow rate of cooling water from the first cooling tower into the second plate heat exchanger decreases; conversely, when the opening of the sixth valve decreases, the flow rate of cooling water from the first cooling tower into the second plate heat exchanger increases.

[0051] In specific control operations, the control unit acquires the inlet water temperature in real time through a temperature sensor installed on the inlet water pipe of the liquid-cooled air conditioning equipment, and calculates the temperature deviation between the inlet water temperature and the preset temperature. Based on the temperature deviation, the target cooling demand is determined. When the temperature deviation is greater than a first preset value, it indicates that the current cooling capacity is insufficient and the cooling demand needs to be increased; when the temperature deviation is less than a second preset value, it indicates that the current cooling capacity is gradually meeting the demand. Furthermore, the opening of the fifth and sixth valves is adjusted according to the temperature deviation to regulate the flow rate of the two cooling water streams entering the second plate heat exchanger. This ensures that the flow rate of the two cooling water streams increases with the increase of the temperature deviation and decreases with the decrease of the temperature deviation, thereby making the total flow rate entering the second plate heat exchanger positively correlated with the temperature deviation.

[0052] Through the above adjustments, the heat exchange capacity of the second plate heat exchanger is dynamically changed with the temperature deviation. When the temperature deviation is large, it provides a stronger heat exchange capacity, and when the temperature deviation is small, it reduces the heat exchange intensity, thereby gradually bringing the inlet water temperature of the liquid-cooled air conditioning equipment closer to the preset temperature.

[0053] Figure 2 This is a schematic diagram of the structure of a refrigeration system provided in an embodiment of this application, such as... Figure 2 As shown, the system specifically includes: The system includes a natural cold source side loop 1, a chiller unit 3 (composed of an evaporator and a condenser), a first cooling tower 6, an air-cooled air conditioning unit 8, a liquid-cooled air conditioning unit 7, a first plate heat exchanger 9, a second plate heat exchanger 5, multiple valve assemblies, and a control unit. It also includes multiple water pumps 10, 11, 12, 13, and 14 for driving the cooling water to circulate in each loop to enable the heat exchange process. The system also includes a second cooling tower 2 for supplying cooling water to the chiller unit.

[0054] The first end 21 and the second end 22 of the first plate heat exchanger 9 are connected to the natural cold source side circuit. The third end 23 of the first plate heat exchanger is connected to the first end of the air-cooled air conditioning equipment through the loop-type supply and return main pipe 4. The fourth end 24 of the first plate heat exchanger is connected to the second end 28 of the second plate heat exchanger through the loop-type supply and return main pipe 4. The first end 27 of the second plate heat exchanger is connected to the second end 26 of the air-cooled air conditioning equipment, the third end 29 of the second plate heat exchanger is connected to the first end 31 of the liquid-cooled air conditioning equipment, and the fourth end 30 of the second plate heat exchanger is connected to the first end 33 of the first cooling tower. The first end 35 of the chiller unit is connected to the first end 25 of the air-cooled air conditioning equipment through the loop-type supply and return main pipe 4. The second end 36 of the chiller unit is connected to the second end 28 of the second plate heat exchanger through the loop-type supply and return main pipe 4. The second end 34 of the first cooling tower is connected to the second end 32 of the liquid-cooled air conditioning equipment. Multiple valve assemblies are respectively located between the second end 26 of the air-cooled air conditioning unit and the first end 27 of the second plate heat exchanger (i.e., the second valve 17 mentioned above), between the first end 33 of the first cooling tower and the fourth end 30 of the second plate heat exchanger (i.e., the third valve 19 mentioned above), between the second end 26 of the air-cooled air conditioning unit and the second end 28 of the second plate heat exchanger (i.e., the fifth valve 18 mentioned above), between the first end 31 of the liquid-cooled air conditioning unit and the first end 33 of the first cooling tower (i.e., the sixth valve 20 mentioned above), between the third end 23 of the first plate heat exchanger and the loop-type supply and return main pipe 4 (i.e., the first valve 15 mentioned above), and between the first end 35 of the chiller unit and the loop-type supply and return main pipe 4 (valve 16). The control unit is connected to the natural cold source side circuit, the chiller unit, the first cooling tower, and the valve assembly, respectively, and is used to control the system to switch between different modes.

[0055] In this embodiment, the control unit achieves the switching of the refrigeration system between different operating modes by coordinating the control of the natural cold source side loop, the chiller unit, the first cooling tower, the second cooling tower, each plate heat exchanger, the valve assembly, and each water pump, and drives the cooling water to circulate in each loop, thereby completing the heat exchange process.

[0056] Each water pump is installed in the natural cold source side circuit, the air-cooled air conditioning equipment circulation circuit, the liquid-cooled air conditioning equipment circulation circuit, and the cooling tower circuit, respectively, to drive the cooling water to circulate in the corresponding circuit; the control unit controls the start and stop of each water pump to establish or stop the circulation in the corresponding circuit.

[0057] I. Natural Cooling Source Mode Control When the parameters of the natural cooling source meet the preset conditions, the control unit and control system enter the natural cooling source mode, which specifically includes: When the natural cold source is the main cold source of the system, chiller unit 3 is not turned on, cooling towers 2 and 6 are not turned on, valve 16 is closed, and valve 15 is open; water pumps 10, 11, and 14 are turned on, water pumps 12 and 13 are closed, valves 17 and 19 are open, and valves 18 and 20 are closed. The low-temperature water from the natural cold source is pumped by water pumps 10 and 11 and the first plate heat exchanger 9. The cooling capacity is then delivered to the air-cooled air conditioning unit 8 via a dual-loop water supply main. After being cooled by the unit, the medium-temperature water passes through plate heat exchanger 5 and exchanges heat with the liquid-cooled air conditioning unit's loop, carrying away heat from the liquid-cooled air conditioning unit 7. The medium-high temperature water then returns to the natural cold source 1 via the dual-loop return water main and plate heat exchanger 9. The mode activation criteria can be the temperature and flow rate of the water supplied from the natural cold source 1. When the supply temperature and flow rate are met, the natural cold source mode is used; when the supply temperature and flow rate are not met, the mechanical refrigeration mode is used. Through the above control, the natural cold source sequentially supplies cooling to both the air-cooled and liquid-cooled air conditioning units via the first and second plate heat exchangers.

[0058] II. Mechanical Refrigeration Mode Control When the parameters of the natural cold source do not meet the preset conditions, the control unit controls the system to enter the mechanical refrigeration mode, which specifically includes: closing valve 15, opening valves 16, 18 and 20, and closing valves 17 and 19. Start the chiller unit 3 and its corresponding second cooling tower 2, and start water pumps 12 and 13 to allow the low-temperature cooling water output from the chiller unit to enter the air-cooled air conditioning equipment through the loop-type supply and return main pipe 4; start the first cooling tower 6 and the circulating loop water pump 14 of the liquid-cooled air conditioning equipment to allow the cooling water output from the first cooling tower to enter the liquid-cooled air conditioning equipment; by closing valves 17 and 19, the connection path between the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment via the second plate heat exchanger 5 is cut off, realizing the mutual isolation of the two circulating loops. Through the above control, the chiller unit and the first cooling tower provide cooling water of different temperature ranges to the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment respectively, and operate independently.

[0059] III. Plate Heat Exchanger Cooling Mode Control During mechanical refrigeration operation, when the inlet water temperature of the liquid-cooled air conditioning unit is detected to be higher than the preset temperature threshold, the control unit controls the system to enter the plate heat exchanger supplementary cooling mode, which specifically includes: While maintaining the operation of chiller unit 3 and first cooling tower 6, control valves 17 and 19 are switched from closed to open; the water pumps of the relevant circuits of second plate heat exchanger 5 are started, so that the cooling water after heat exchange by the air-cooled air conditioning equipment enters the second plate heat exchanger 5 through valve 17; at the same time, the cooling water output from the first cooling tower enters the second plate heat exchanger 5 through valve 19; in the second plate heat exchanger 5, the cooling water from the air-cooled air conditioning equipment cools the cooling water from the first cooling tower, and the cooled cooling water is then transported to the liquid-cooled air conditioning equipment; Furthermore, the control unit adjusts the opening of valves 18 and 20 according to the temperature deviation between the inlet water temperature of the liquid-cooled air conditioning equipment and the preset temperature, so as to adjust the flow rate of the two cooling waters entering the second plate heat exchanger 5, making the flow rate positively correlated with the temperature deviation, thereby dynamically adjusting the cooling capacity.

[0060] Figure 3 This is a schematic diagram of another refrigeration system control device provided in an embodiment of this application, as shown below. Figure 3 As shown, the system specifically includes: The system consists of a natural cooling source side loop, a chiller unit, a cooling tower, an air-cooled air conditioning unit (RAU), a liquid-cooled air conditioning unit (CDU), a first plate heat exchanger, a second plate heat exchanger, loop-type supply and return water pipelines, multiple valves, and water pumps. The natural cooling source side loop is isolated from the internal circulation loop of the system through the first plate heat exchanger. The chiller unit consists of an evaporator and a condenser, and dissipates heat through the cooling tower. Each water pump drives the circulation of cooling water in a different loop to ensure continuous heat exchange within the system.

[0061] Lake water, acting as a natural cold source, enters the first plate heat exchanger from the inlet side. After exchanging heat with the return water within the system, it is discharged from the return water side. The other side of the first plate heat exchanger is connected to the air-cooled air conditioning unit via supply and return water pipelines, allowing the return water in the air-cooled air conditioning unit's circulation loop to enter the first plate heat exchanger for cooling. The cooling water, cooled by the first plate heat exchanger, is then transported to the air-cooled air conditioning unit for heat exchange with the air environment. After heat exchange, the cooling water continues to flow along the pipeline and, under valve control, is selectively directed to either enter the second plate heat exchanger or return to the original loop.

[0062] The second plate heat exchanger is located between the air-cooled air conditioning unit and the liquid-cooled air conditioning unit. One side is connected to the outlet of the air-cooled unit, and the other side is connected to the return water of the liquid-cooled unit. It is also connected to the supply water side of the closed-loop cooling tower. Cooling water from the air-cooled unit exchanges heat with the return water from the liquid-cooled unit or the cooling water supplied by the closed-loop cooling tower in the second plate heat exchanger, thus transferring cooling capacity between different loops. The liquid-cooled air conditioning unit cools the high-heat-density equipment through its circulation loop. The return water, after being cooled by the second plate heat exchanger, re-enters the liquid-cooled air conditioning unit, forming a closed loop.

[0063] In addition, the chiller unit is connected to the air-cooled air conditioning equipment to provide low-temperature cooling water to the air-cooled air conditioning equipment when natural cooling sources are insufficient; the condenser side of the chiller unit is connected to the cooling tower to release the heat generated during the refrigeration process. The closed cooling tower is connected to the liquid-cooled air conditioning equipment through pipelines to provide relatively high-temperature cooling water to the liquid-cooled air conditioning equipment in mechanical refrigeration mode.

[0064] By installing multiple valves at key pipeline nodes, the connection or isolation between different loops can be controlled, thereby enabling the switching of multiple operating modes. Simultaneously, the start and stop of each water pump establishes or interrupts the water circulation of the corresponding loop. Based on this structure, the system can flexibly switch between natural cooling source mode, mechanical refrigeration mode, and plate heat exchanger supplementary cooling mode, achieving graded utilization and efficient allocation of cooling capacity.

[0065] Figure 4 A schematic diagram of another refrigeration system control device provided in the embodiments of this application is shown below. Figure 4 As shown, the system specifically includes: By eliminating the plate heat exchanger between the air-cooled and liquid-cooled air conditioning systems, the two types of terminal equipment share the same cooling source, and different cooling capacity demands are allocated based on flow rate regulation. The system mainly includes a natural cooling source side loop, a chiller unit (consisting of an evaporator and a condenser), a cooling tower, heat exchange devices, a loop-type supply and return main, air-cooled air conditioning equipment, and liquid-cooled air conditioning equipment, with the air-cooled and liquid-cooled air conditioning equipment connected in parallel to the same loop-type supply and return main.

[0066] Structurally, the natural cooling source side loop is connected to the loop-type supply and return main pipe via a plate heat exchanger to provide cooling capacity to the system when the natural cooling source conditions are met. The evaporator side of the chiller unit is also connected to the loop-type supply and return main pipe to provide low-temperature cooling water when the natural cooling source is insufficient. The condenser side of the chiller unit dissipates heat through a cooling tower. The air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment are connected to the loop-type supply and return main pipe via their respective branch lines. They are installed in parallel and share the same cooling water under the same supply water temperature conditions.

[0067] During operation, the control unit determines the system operating mode based on the parameters of the natural cooling source. When the natural cooling source meets the preset conditions, the natural cooling source side loop is opened first, supplying cooling water to the loop-type supply and return main through the plate heat exchanger; when the natural cooling source is insufficient, the chiller unit is started, supplying cooling water to the loop-type supply and return main. At the same time, the chiller unit is cooled by the cooling tower to maintain its stable operation.

[0068] In terms of cooling distribution, the control unit obtains the cooling demand of both air-cooled and liquid-cooled air conditioning units, and controls the flow rate of cooling water entering the air-cooled and liquid-cooled air conditioning units by adjusting the operating parameters of regulating valves or water pumps on each branch. Since both use the same supply water temperature, the cooling capacity of different terminal equipment can be adjusted by increasing or decreasing the flow rate of the corresponding branch, thereby meeting the differentiated needs of air-cooled and liquid-cooled loads.

[0069] Specifically, when the load on the liquid-cooled air conditioning equipment is high, the control unit increases the flow rate of the liquid-cooled air conditioning equipment branch, allowing more cooling water to enter the liquid-cooled air conditioning equipment to enhance its heat exchange capacity; when the load on the air-cooled air conditioning equipment is high, the flow rate of the air-cooled air conditioning equipment branch is increased accordingly. At the same time, the flow rate can be dynamically closed-loop adjusted according to the deviation between the return water temperature of each branch and the set value, so that the inlet and outlet water temperatures of each terminal device are maintained within a reasonable range.

[0070] Through the above structure and control method, the system realizes the parallel operation of air-cooled air conditioning equipment and liquid-cooled air conditioning equipment under the same cooling conditions, avoiding the temperature difference loss caused by multi-stage plate heat exchange. At the same time, the system achieves flexible adjustment of cooling capacity through flow distribution, thereby improving the overall energy efficiency and control simplicity of the system.

[0071] Figure 5 This is a schematic diagram of the structure of a refrigeration system control device provided in an embodiment of this application, as shown below. Figure 5 As shown, the method specifically includes: The acquisition module 51 is used to acquire the natural cold source parameters corresponding to the refrigeration system; The first control module 52 is used to determine that the refrigeration system is in natural cold source mode when the natural cold source parameters meet the preset conditions, and to control the natural cold source to exchange heat with the air-cooled air conditioning equipment of the refrigeration system through the first plate heat exchanger according to the natural cold source mode, and then input the cooled water after heat exchange into the second plate heat exchanger so that the cooled water after heat exchange can exchange heat with the liquid-cooled air conditioning equipment of the refrigeration system through the second plate heat exchanger. The second control module 53 is used to determine that the refrigeration system is in mechanical refrigeration mode when the parameters of the natural cold source do not meet the preset conditions, and to control the chiller unit to provide cooling water in the first temperature range to the air-cooled air conditioning equipment and to control the first cooling tower to provide cooling water in the second temperature range to the liquid-cooled air conditioning equipment according to the mechanical refrigeration mode, while controlling the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment to be isolated from each other, and the first temperature range is lower than the second temperature range.

[0072] In one possible implementation, the first control module is specifically used to control the opening of the first valve between the first plate heat exchanger and the air-cooled air conditioning equipment, and to control the natural cold source side pipeline to connect to the first plate heat exchanger. The natural cold source is controlled to enter the first plate heat exchanger, and the first return water in the circulation loop of the air-cooled air conditioning equipment is controlled to enter the first plate heat exchanger, so that the first return water and the natural cold source exchange heat in the first plate heat exchanger to obtain the first cooling water after exchanging heat with the first return water. The first cooling water is delivered to the air-cooled air conditioning equipment for heat exchange, resulting in a second cooling water after heat exchange with the first cooling water. The second valve between the circulation loop of the air-cooled air conditioning equipment and the second plate heat exchanger is opened to allow the second cooling water to enter the second plate heat exchanger through the second valve; The third valve between the circulation loop of the liquid-cooled air conditioning equipment and the second plate heat exchanger is opened, so that the second return water in the circulation loop of the liquid-cooled air conditioning equipment enters the second plate heat exchanger through the third valve, so that the second return water exchanges heat with the second cooling water.

[0073] In one possible implementation, the second control module is specifically used to control the opening of the fourth valve between the chiller unit and the circulation loop of the air-cooled air conditioning equipment, so that the chiller unit outputs cooling water of a first temperature range to the circulation loop of the air-cooled air conditioning equipment, and the chiller unit is connected to the second cooling tower to obtain cooling water; Control the connection of the water supply pipeline between the first cooling tower and the liquid-cooled air conditioning equipment, so that the first cooling tower outputs cooling water in the second temperature range to the circulation loop of the liquid-cooled air conditioning equipment; The second and third valves are controlled to close, so as to isolate the circulation loop of the air-cooled air conditioning equipment from the circulation loop of the liquid-cooled air conditioning equipment.

[0074] In one possible implementation, the second control module is further configured to control the opening of a fifth valve in the circulation loop of the air-cooled air conditioning unit and a sixth valve in the circulation loop of the liquid-cooled air conditioning unit. The fifth valve is configured to input cooling water in the first temperature range provided by the chiller unit into the air-cooled air conditioning unit, and the sixth valve is configured to input cooling water in the second temperature range provided by the first cooling tower into the liquid-cooled air conditioning unit.

[0075] In one possible implementation, the second control module is further configured to, in the mechanical refrigeration mode, when the inlet water temperature of the liquid-cooled air conditioning equipment is detected to be higher than the preset temperature, determine that the system is in the plate heat exchanger supplementary cooling mode, and control the second valve and the third valve to open according to the plate heat exchanger supplementary cooling mode; The cooling water after heat exchange with the air-cooled air conditioning equipment is fed into the second plate heat exchanger through the second valve, and the cooling water output from the first cooling tower is fed into the second plate heat exchanger through the third valve, so that the cooling water output from the first cooling tower exchanges heat with the cooling water after heat exchange with the air-cooled air conditioning equipment, and is then output to the liquid-cooled air conditioning equipment.

[0076] In one possible implementation, the second control module is further configured to acquire the inlet water temperature of the liquid-cooled air conditioning equipment in the plate heat exchanger supplemental cooling mode, and calculate the temperature deviation between the inlet water temperature and the preset temperature. The opening of the fifth valve and the sixth valve are adjusted based on the temperature deviation to regulate the flow rate of the cooling water entering the second plate heat exchanger after heat exchange with the air-cooled air conditioning equipment and the cooling water output from the first cooling tower. The flow rate is positively correlated with the temperature deviation.

[0077] The device provided in this embodiment may be as follows: Figure 3 The apparatus shown can perform, for example Figure 1 All steps of the method, thus achieving Figure 1 For details on the technical effects of the method shown, please refer to [link / reference]. Figure 1 The relevant descriptions are presented concisely and will not be elaborated upon here.

[0078] Figure 6 This is a schematic diagram of the structure of a computer device provided in an embodiment of this application. Figure 6The computer device 400 shown includes at least one processor 401, a memory 402, at least one network interface 404, and other user interfaces 403. The various components in the computer device 400 are coupled together via a bus system 405. It is understood that the bus system 405 is used to implement communication between these components. In addition to a data bus, the bus system 405 also includes a power bus, a control bus, and a status signal bus. However, for clarity, ... Figure 6 The general designated all buses as Bus System 405.

[0079] The user interface 403 may include a display, keyboard, or clicking device (e.g., mouse, trackball, touchpad, or touchscreen).

[0080] It is understood that the memory 402 in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous DRAM (SDRAM), Double Data Rate Synchronous DRAM (DDRSDRAM), Enhanced Synchronous DRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 402 described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0081] In some implementations, memory 402 stores elements, executable units or data structures, or subsets thereof, or extended sets thereof: operating system 4021 and application program 4022.

[0082] The operating system 4021 includes various system programs, such as the framework layer, core library layer, and driver layer, used to implement various basic business functions and handle hardware-based tasks. The application program 4022 includes various applications, such as a media player and a browser, used to implement various application functions. Programs implementing the methods of this application embodiment can be included in application program 4022.

[0083] In this embodiment, by calling the program or instructions stored in memory 402, specifically the program or instructions stored in application program 4022, processor 401 executes the method steps provided in each method embodiment, including, for example: Obtain the parameters of the natural cold source corresponding to the refrigeration system; When the natural cold source parameters meet the preset conditions, the refrigeration system is determined to be in natural cold source mode. According to the natural cold source mode, the natural cold source is controlled to exchange heat with the air-cooled air conditioning equipment of the refrigeration system through the first plate heat exchanger. Then, the cooled water after heat exchange is input into the second plate heat exchanger so that the cooled water after heat exchange is exchanged with the liquid-cooled air conditioning equipment of the refrigeration system through the second plate heat exchanger. When the parameters of the natural cold source do not meet the preset conditions, the refrigeration system is determined to be in mechanical refrigeration mode. According to the mechanical refrigeration mode, the chiller unit is controlled to provide cooling water in the first temperature range to the air-cooled air conditioning equipment, and the first cooling tower is controlled to provide cooling water in the second temperature range to the liquid-cooled air conditioning equipment. At the same time, the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment are controlled to be isolated from each other, and the first temperature range is lower than the second temperature range.

[0084] The methods disclosed in the embodiments of this application can be applied to processor 401, or implemented by processor 401. Processor 401 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 401 or by instructions in the form of software. The processor 401 may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software units in the decoding processor. The software units may be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 402. Processor 401 reads the information in memory 402 and, in conjunction with its hardware, completes the steps of the above method.

[0085] It is understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described herein, or combinations thereof.

[0086] For software implementation, the techniques described herein can be implemented by units that perform the functions described herein. The software code can be stored in memory and executed by a processor. The memory can be implemented in the processor or external to the processor.

[0087] The computer device provided in this embodiment may be as follows: Figure 6 The device shown can perform, for example Figure 1 All steps of the method, thus achieving Figure 1 For details on the technical effects of the method shown, please refer to [link / reference]. Figure 1 The relevant descriptions are presented concisely and will not be elaborated upon here.

[0088] This application also provides a storage medium (computer-readable storage medium). This storage medium stores one or more programs. The storage medium may include volatile memory, such as random access memory; it may also include non-volatile memory, such as read-only memory, flash memory, hard disk, or solid-state drive; and it may also include combinations of the above types of memory.

[0089] When one or more programs in the storage medium can be executed by one or more processors to achieve the above-described method of execution on the device side.

[0090] The processor is used to execute a program stored in memory to implement the steps of the method performed on the device side: Obtain the parameters of the natural cold source corresponding to the refrigeration system; When the natural cold source parameters meet the preset conditions, the refrigeration system is determined to be in natural cold source mode. According to the natural cold source mode, the natural cold source is controlled to exchange heat with the air-cooled air conditioning equipment of the refrigeration system through the first plate heat exchanger. Then, the cooled water after heat exchange is input into the second plate heat exchanger so that the cooled water after heat exchange is exchanged with the liquid-cooled air conditioning equipment of the refrigeration system through the second plate heat exchanger. When the parameters of the natural cold source do not meet the preset conditions, the refrigeration system is determined to be in mechanical refrigeration mode. According to the mechanical refrigeration mode, the chiller unit is controlled to provide cooling water in the first temperature range to the air-cooled air conditioning equipment, and the first cooling tower is controlled to provide cooling water in the second temperature range to the liquid-cooled air conditioning equipment. At the same time, the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment are controlled to be isolated from each other, and the first temperature range is lower than the second temperature range.

[0091] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0092] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented in hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0093] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above description is only a specific embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for controlling a refrigeration system, characterized in that, include: Obtain the parameters of the natural cold source corresponding to the refrigeration system; When the natural cold source parameters meet the preset conditions, the refrigeration system is determined to be in natural cold source mode. According to the natural cold source mode, the natural cold source is controlled to exchange heat with the air-cooled air conditioning equipment of the refrigeration system through the first plate heat exchanger. Then, the cooled water after heat exchange is input into the second plate heat exchanger so that the cooled water after heat exchange is exchanged with the liquid-cooled air conditioning equipment of the refrigeration system through the second plate heat exchanger. When the parameters of the natural cold source do not meet the preset conditions, the refrigeration system is determined to be in mechanical refrigeration mode. According to the mechanical refrigeration mode, the chiller unit is controlled to provide cooling water in the first temperature range to the air-cooled air conditioning equipment, and the first cooling tower is controlled to provide cooling water in the second temperature range to the liquid-cooled air conditioning equipment. At the same time, the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment are controlled to be isolated from each other, and the first temperature range is lower than the second temperature range.

2. The method according to claim 1, characterized in that, The controlled natural cold source exchanges heat with the air-cooled air conditioning equipment of the refrigeration system through the first plate heat exchanger, and then the cooled water after heat exchange is input into the second plate heat exchanger, so that the cooled water after heat exchange exchanges heat with the liquid-cooled air conditioning equipment of the refrigeration system through the second plate heat exchanger, including: The first valve between the first plate heat exchanger and the air-cooled air conditioning equipment is opened, and the natural cold source side pipeline is connected to the first plate heat exchanger. The natural cold source is controlled to enter the first plate heat exchanger, and the first return water in the circulation loop of the air-cooled air conditioning equipment is controlled to enter the first plate heat exchanger, so that the first return water and the natural cold source exchange heat in the first plate heat exchanger to obtain the first cooling water after exchanging heat with the first return water. The first cooling water is delivered to the air-cooled air conditioning equipment for heat exchange, resulting in a second cooling water after heat exchange with the first cooling water. The second valve between the circulation loop of the air-cooled air conditioning equipment and the second plate heat exchanger is opened to allow the second cooling water to enter the second plate heat exchanger through the second valve. The third valve between the circulation loop of the liquid-cooled air conditioning equipment and the second plate heat exchanger is opened, so that the second return water in the circulation loop of the liquid-cooled air conditioning equipment enters the second plate heat exchanger through the third valve, so that the second return water exchanges heat with the second cooling water.

3. The method according to claim 2, characterized in that, The control of the chiller unit to provide cooling water within a first temperature range to the air-cooled air conditioning equipment, and the control of the first cooling tower to provide cooling water within a second temperature range to the liquid-cooled air conditioning equipment, while simultaneously controlling the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment to be isolated from each other, includes: The fourth valve between the chiller unit and the circulation loop of the air-cooled air conditioning equipment is opened, so that the chiller unit outputs cooling water in the first temperature range to the circulation loop of the air-cooled air conditioning equipment. The chiller unit is connected to the second cooling tower to obtain cooling water. Control the connection of the water supply pipeline between the first cooling tower and the liquid-cooled air conditioning equipment, so that the first cooling tower outputs cooling water in the second temperature range to the circulation loop of the liquid-cooled air conditioning equipment; The second and third valves are controlled to close, so that the circulation loop of the air-cooled air conditioning unit is isolated from the circulation loop of the liquid-cooled air conditioning unit.

4. The method according to claim 3, characterized in that, After the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment are isolated from each other, the method further includes: The fifth valve in the circulation loop of the air-cooled air conditioning unit is opened, and the sixth valve in the circulation loop of the liquid-cooled air conditioning unit is opened. The fifth valve is used to input cooling water in the first temperature range provided by the chiller unit into the air-cooled air conditioning unit, and the sixth valve is used to input cooling water in the second temperature range provided by the first cooling tower into the liquid-cooled air conditioning unit.

5. The method according to claim 4, characterized in that, The method further includes: In the mechanical refrigeration mode, when the inlet water temperature of the liquid-cooled air conditioning equipment is detected to be higher than the preset temperature, the system is determined to be in the plate heat exchanger supplementary cooling mode, and the second valve and the third valve are controlled to open according to the plate heat exchanger supplementary cooling mode; The cooling water after heat exchange with the air-cooled air conditioning equipment is fed into the second plate heat exchanger through the second valve, and the cooling water output from the first cooling tower is fed into the second plate heat exchanger through the third valve, so that the cooling water output from the first cooling tower exchanges heat with the cooling water after heat exchange with the air-cooled air conditioning equipment, and is then output to the liquid-cooled air conditioning equipment.

6. The method according to claim 5, characterized in that, The method further includes: In the plate heat exchanger cooling mode, the inlet water temperature of the liquid-cooled air conditioning equipment is obtained, and the temperature deviation between the inlet water temperature and the preset temperature is calculated. The opening of the fifth valve and the sixth valve are adjusted based on the temperature deviation to regulate the flow rate of the cooling water entering the second plate heat exchanger after heat exchange with the air-cooled air conditioning equipment and the cooling water output from the first cooling tower. The flow rate is positively correlated with the temperature deviation.

7. A refrigeration system, characterized in that, For implementing the method of claim 1, the system includes: a natural cold source side loop, a chiller unit, a first cooling tower, an air-cooled air conditioning unit, a liquid-cooled air conditioning unit, a first plate heat exchanger, a second plate heat exchanger, multiple valve assemblies, and a control unit; The first end and the second end of the first plate heat exchanger are connected to the natural cold source side loop, the third end of the first plate heat exchanger is connected to the first end of the air-cooled air conditioning equipment through a loop-type supply and return main pipe, and the fourth end of the first plate heat exchanger is connected to the second end of the second plate heat exchanger through the loop-type supply and return main pipe. The first end of the second plate heat exchanger is connected to the second end of the air-cooled air conditioning equipment, the third end of the second plate heat exchanger is connected to the first end of the liquid-cooled air conditioning equipment, and the fourth end of the second plate heat exchanger is connected to the first end of the first cooling tower. The first end of the chiller unit is connected to the first end of the air-cooled air conditioning equipment through the loop-type supply and return main pipe, the second end of the chiller unit is connected to the second end of the second plate heat exchanger through the loop-type supply and return main pipe, and the second end of the first cooling tower is connected to the second end of the liquid-cooled air conditioning equipment. Multiple valve assemblies are respectively disposed between: the second end of the air-cooled air conditioning unit and the first end of the second plate heat exchanger; between the first end of the first cooling tower and the fourth end of the second plate heat exchanger; between the second end of the air-cooled air conditioning unit and the second end of the second plate heat exchanger; between the first end of the liquid-cooled air conditioning unit and the first end of the first cooling tower; between the third end of the first plate heat exchanger and the loop-type supply and return main pipe; and between the first end of the chiller unit and the loop-type supply and return main pipe. The control unit is connected to the natural cold source side circuit, the chiller unit, the first cooling tower and the valve assembly respectively, and is used to control the system to switch between different modes.

8. A refrigeration system control device, characterized in that, include: The acquisition module is used to acquire the natural cold source parameters corresponding to the refrigeration system; The first control module is used to determine that the refrigeration system is in natural cold source mode when the natural cold source parameters meet the preset conditions, and to control the natural cold source to exchange heat with the air-cooled air conditioning equipment of the refrigeration system through the first plate heat exchanger according to the natural cold source mode, and then input the cooled water after heat exchange into the second plate heat exchanger so that the cooled water after heat exchange can exchange heat with the liquid-cooled air conditioning equipment of the refrigeration system through the second plate heat exchanger. The second control module is used to determine that the refrigeration system is in mechanical refrigeration mode when the parameters of the natural cold source do not meet the preset conditions, and to control the chiller unit to provide cooling water in the first temperature range to the air-cooled air conditioning equipment and to control the first cooling tower to provide cooling water in the second temperature range to the liquid-cooled air conditioning equipment according to the mechanical refrigeration mode, while controlling the air-cooled air conditioning equipment and the liquid-cooled air conditioning equipment to be isolated from each other, and the first temperature range is lower than the second temperature range.

9. A computer device, characterized in that, include: A processor and a memory, the processor being configured to execute a refrigeration system control program stored in the memory to implement the refrigeration system control method according to any one of claims 1 to 6.

10. A storage medium, characterized in that, The storage medium stores one or more programs, which can be executed by one or more processors to implement the refrigeration system control method according to any one of claims 1 to 6.

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