CDU liquid cooling system anti-condensation control method and CDU liquid cooling system

Abstract

The invention provides an anti-condensation control method for a CDU liquid cooling system and the CDU liquid cooling system, and the method comprises the steps: receiving temperature and humidity data transmitted by a temperature and humidity sensor and liquid supply temperature data transmitted by a first temperature sensor through a controller, and calculating the current dew point temperature through the temperature and humidity data; if it is determined that the current liquid supply temperature meets the dew-point temperature condition according to the liquid supply temperature data, the dew-point comparison temperature corresponding to the current dew-point temperature and a liquid supply temperature target value are obtained, and the opening degree of an electric valve is controlled according to the comparison result of the dew-point comparison temperature and the liquid supply temperature target value. The dew-point temperature condition comprises that the current liquid supply temperature in the preset time period is smaller than the dew-point temperature threshold value, and the dew-point comparison temperature is larger than the dew-point temperature threshold value and larger than the dew-point temperature. According to the embodiment of the invention, condensation on the surface of the secondary side pipeline can be effectively avoided, the risks of electrical short circuit and equipment corrosion are reduced, and the equipment safety is improved.

Description

Technical Field

[0001] This application relates to the field of CDU technology, and more specifically, to a method for preventing condensation control in a CDU liquid cooling system and a CDU liquid cooling system. Background Technology

[0002] A Cooling Distribution Unit (CDU) is an integrated device in a liquid cooling system responsible for coolant circulation, temperature control, pressure management, filtration, and monitoring. It acts as the "heart" and "dispatch center" of the liquid cooling system, connecting the primary coolant supply (e.g., chillers) with the secondary loads (e.g., server cold plates, immersion liquid cooling tanks), achieving efficient, stable, and controllable heat transfer.

[0003] In existing technologies, the power at the load end changes, causing the heat generated to change accordingly. However, the primary side of the liquid cooling system still provides a fixed flow rate of coolant, resulting in the secondary side's supply temperature increasing or decreasing due to changes in the load end's power. During the process of decreasing supply temperature, it may fall below the ambient dew point temperature, causing condensation on the surface of the secondary side's pipes, which can lead to risks such as electrical short circuits and equipment corrosion. Summary of the Invention

[0004] This application provides a method for preventing condensation in a CDU liquid cooling system and a CDU liquid cooling system in general. This solves the problem in existing methods where the primary side flow rate is fixed, easily causing the secondary side liquid supply temperature to drop below the dew point temperature, leading to condensation on the secondary side pipeline surface, which can cause electrical short circuits and equipment corrosion. To achieve this objective, this application provides the following solutions.

[0005] According to one aspect of the embodiments of this application, a method for preventing condensation in a CDU liquid cooling system is provided, for a CDU liquid cooling system having a primary side, a secondary side, and a controller. The primary side is provided with an electric valve for controlling flow rate, and the secondary side is provided with a temperature and humidity sensor for detecting ambient temperature and a first temperature sensor for detecting the liquid supply temperature. The controller is connected to the electric valve and the temperature and humidity sensor respectively. The method includes: The controller receives temperature and humidity data transmitted by the temperature and humidity sensor and liquid supply temperature data transmitted by the first temperature sensor, and uses the temperature and humidity data to calculate the current dew point temperature. If the current supply temperature is determined to meet the dew point temperature condition based on the supply temperature data, then the dew point comparison temperature corresponding to the current dew point temperature and the target value of the supply temperature are obtained. The opening degree of the electric valve is controlled according to the comparison result between the dew point comparison temperature and the target value of the supply temperature. The dew point temperature condition includes the current supply temperature being less than the dew point temperature threshold within a preset time period, and the dew point comparison temperature being greater than the dew point temperature threshold and the dew point temperature being greater than the dew point temperature.

[0006] In one possible implementation, calculating the current dew point temperature using the temperature and humidity data includes: Determine the current dry-bulb temperature and relative humidity based on the temperature and humidity data, and calculate the actual water vapor pressure based on the dry-bulb temperature and relative humidity. Calculate the current dew point temperature based on the actual water vapor pressure.

[0007] In one possible implementation, calculating the actual vapor pressure based on the dry-bulb temperature and the relative humidity includes: Calculate the current saturated vapor pressure based on the dry bulb temperature; The current actual water vapor pressure is calculated based on the relative humidity and the saturated water vapor pressure.

[0008] In one possible implementation, the CDU liquid cooling system further includes a display screen, the controller is connected to the display screen, and the determination of the dew point temperature condition includes: Determine the dew point temperature threshold based on the current dew point temperature; If the current liquid supply temperature is lower than the dew point temperature threshold and the time it is lower than the dew point temperature threshold reaches a first preset time, then it is determined that the dew point temperature condition is met, and the anti-condensation mode is entered, and alarm information is displayed on the display screen.

[0009] In one possible implementation, controlling the opening degree of the electric valve based on the comparison result of the dew point comparison temperature and the target value of the liquid supply temperature includes: If the dew point comparison temperature is determined to be greater than the target value of the liquid supply temperature, then the dew point comparison temperature is determined as the temperature adjustment target value, and the opening degree of the electric valve is adjusted based on the temperature adjustment target value.

[0010] In one possible implementation, adjusting the opening degree of the electric valve based on the target temperature value includes: Based on the temperature regulation target value, reduce the opening of the electric valve and detect the current liquid supply temperature on the secondary side; If the current liquid supply temperature is determined to meet the exit conditions, then exit the anti-condensation mode and stop adjusting the opening degree.

[0011] In one possible implementation, determining that the current liquid supply temperature meets the exit condition includes: If it is determined that the difference between the current liquid supply temperature and the current dew point temperature is greater than or equal to the dew point control temperature or the current liquid supply temperature exceeds the maximum temperature within the second preset time period, then the exit condition is determined to be met.

[0012] In one possible implementation, controlling the opening degree of the electric valve based on the comparison result of the dew point comparison temperature and the target value of the liquid supply temperature includes: If the dew point comparison temperature is determined to be less than or equal to the liquid supply temperature target value, then the liquid supply temperature target value is determined as the temperature regulation target value, and the opening degree of the electric valve is controlled based on the temperature regulation target value.

[0013] In one possible implementation, the adjustment of the opening degree of the electric valve includes: Lowering the lower limit of the opening of the electric valve generates a new opening adjustment range; The opening of the electric valve is gradually adjusted according to the new opening adjustment range and the current liquid supply temperature on the secondary side.

[0014] According to one aspect of the embodiments of this application, a CDU liquid cooling system is provided. The CDU liquid cooling system includes a primary side, a secondary side, and a controller. The controller is connected to an electric valve in the primary side, a temperature and humidity sensor in the secondary side, and a first temperature sensor. The CDU liquid cooling system implements the method described above through the controller.

[0015] The beneficial effects of the technical solutions provided in this application are: The anti-condensation control method for CDU liquid cooling systems provided in this application is used in CDU liquid cooling systems with a primary side, a secondary side, and a controller. The primary side is equipped with an electric valve for controlling the flow rate, and the secondary side is equipped with a temperature and humidity sensor for detecting the ambient temperature and a first temperature sensor for detecting the supply liquid temperature. The controller is connected to the electric valve and the temperature and humidity sensor respectively. The method includes: the controller receiving temperature and humidity data transmitted by the temperature and humidity sensor and supply liquid temperature data transmitted by the first temperature sensor, and calculating the current dew point temperature using the temperature and humidity data; if it is determined from the supply liquid temperature data that the current supply liquid temperature meets the dew point temperature condition, then obtaining the dew point comparison temperature corresponding to the current dew point temperature and the target value of the supply liquid temperature, and controlling the opening degree of the electric valve according to the comparison result of the dew point comparison temperature and the target value of the supply liquid temperature. The dew point temperature condition includes the current supply liquid temperature being less than the dew point temperature threshold within a preset time period, and the dew point comparison temperature being greater than the dew point temperature threshold and greater than the dew point temperature. The embodiments of this application can determine in real time whether there is a risk of condensation, and control the opening degree of the electric valve to adjust the flow rate on the primary side according to the determination result, which can effectively avoid condensation on the surface of the secondary side pipeline, reduce the risk of electrical short circuits and equipment corrosion, and improve equipment safety. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below.

[0017] Figure 1 A flowchart of the anti-condensation control method for a CDU liquid cooling system provided in this application embodiment; Figure 2 Device connection diagram of the controller provided in the embodiments of this application; Figure 3 This is a structural diagram of the CDU liquid cooling system provided in an embodiment of this application. Attached image description: 11. Second temperature sensor; 12. Primary side filter; 13. First pressure sensor; 14. Electric valve; 2. Plate heat exchanger; 30. First temperature sensor; 31. Automatic vent valve; 32. Expansion tank; 33. Second pressure sensor; 34. Replenishment pump; 35. Storage tank; 36. Secondary side filter; 37. Temperature and humidity sensor; 38. Water immersion sensor; 39. Electric two-way valve; 310. Circulating water pump; 4. Controller; 5. Display screen. Detailed Implementation

[0019] The embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the embodiments described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions of the embodiments of this application.

[0020] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the terms “comprising” and “including” as used in embodiments of this application mean that the corresponding feature can be implemented as the presented feature, information, data, step, operation, element, and / or component, but do not exclude implementation as other features, information, data, step, operation, element, component, and / or combinations thereof supported by the art. It should be understood that when we say that an element is “connected” or “coupled” to another element, the one element can be directly connected or coupled to the other element, or it can mean that the one element and the other element establish a connection relationship through an intermediate element. Furthermore, “connected” or “coupled” as used herein can include wireless connection or wireless coupling. The term “and / or” as used herein indicates at least one of the items defined by the term; for example, “A and / or B” indicates implementation as “A,” or implementation as “A,” or implementation as “A and B.”

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0022] The technical solutions of this application and their effects are described below through several exemplary embodiments. It should be noted that the following embodiments can be referenced, borrowed from, or combined with each other. Identical terms, similar features, and similar implementation steps in different embodiments will not be repeated.

[0023] The anti-condensation control method and CDU liquid cooling system provided in this application aim to solve at least one technical problem existing in the prior art.

[0024] Optionally, such as Figure 2 , Figure 3 As shown, the CDU liquid cooling system may include a primary side, a secondary side, and a controller 4. The primary side is equipped with an electric valve 14 for controlling the flow rate, and the secondary side is equipped with a temperature and humidity sensor 37 for detecting the ambient temperature and a first temperature sensor 30 for detecting the liquid supply temperature. The controller 4 is connected to the electric valve 14 and the temperature and humidity sensor 37 respectively.

[0025] The secondary side may include a coolant replenishment module and a second transmission pipeline. A portion of the second transmission pipeline is located within the unit to be cooled. The second transmission pipeline is used to transmit coolant, which is used to cool the unit. The coolant replenishment module is connected to the second transmission pipeline and includes a storage tank 35 and an expansion tank 32. The expansion tank 32 is connected to both the second transmission pipeline and the storage tank 35. The expansion tank 32 stores coolant and is used to stabilize the pressure of the second transmission pipeline. The storage tank 35 is used to replenish coolant to the expansion tank 32 and to clean the expansion tank 32.

[0026] Optionally, the primary and secondary sides can be connected by a heat exchanger, which facilitates heat exchange between them. This heat exchanger can be a plate heat exchanger 2.

[0027] Optionally, a second temperature sensor 11 for detecting the coolant temperature can be provided on the primary side transmission pipeline. The second temperature sensor 11 can be set at the inlet and outlet of the transmission pipeline to detect the inlet temperature and outlet temperature of the coolant, respectively.

[0028] Optionally, a first pressure sensor 13 for detecting pressure and a first flow sensor for detecting flow can also be provided on the first transmission pipeline on the primary side. The first pressure sensor 13 can detect the inlet pressure and outlet pressure of the first transmission pipeline.

[0029] Optionally, a primary side filter 12 and a drain valve for draining coolant can also be installed on the first transmission pipeline on the primary side. A first pressure sensor 13 can also be installed on the outlet side of the primary side filter 12 to detect the outlet pressure of the primary side filter 12.

[0030] Optionally, a secondary side filter 36, a second pressure sensor 33, a second flow sensor, and a drain valve can be installed on the second transmission pipeline. The second pressure sensor 33 can be used to detect the supply pressure and return pressure of the second transmission pipeline, as well as the inlet pressure and outlet pressure of the secondary side filter 36. The second flow sensor can be installed on the return pipeline in the second transmission pipeline.

[0031] Optionally, the second transmission pipeline may include a safety valve, a reservoir 35, a replenishment pump 34, and an expansion tank 32. The safety valve can be connected to the reservoir 35. When the safety valve detects that the pressure inside the second transmission pipeline exceeds a predetermined pressure (e.g., 4 bar), it discharges the coolant (e.g., water) from the second transmission pipeline into the reservoir 35. Furthermore, the controller 4 can be connected to the replenishment pump 34. When it detects insufficient coolant inside the second transmission pipeline (e.g., pressure lower than a preset pressure), it uses the replenishment pump 34 to replenish the coolant from the reservoir 35 into the second transmission pipeline. The expansion tank 32 is used to maintain stable coolant pressure in the second transmission pipeline.

[0032] Optionally, an automatic exhaust valve 31 can be provided at the highest point of the second transmission pipeline to exhaust the air in the second transmission pipeline.

[0033] Optionally, in order to prevent water immersion on the secondary side, a water immersion sensor 38 can be provided in the area where the secondary side is located to detect whether water immersion occurs.

[0034] Optionally, an electric two-way valve 39 may be provided between the liquid supply line and the liquid return line of the second transmission line. The electric two-way valve 39 is used to control the pressure difference between the liquid supply line and the liquid return line so that the pressure difference is maintained within a predetermined range.

[0035] Optionally, in the second transmission pipeline, a circulating water pump 310 is provided between the outlet of the replenishment pump 34 and the safety valve, and the circulating water pump 310 is used to drive the coolant to flow in the second transmission pipeline.

[0036] Optionally, the CDU liquid cooling system described in the above embodiments implements the anti-condensation control method for the CDU liquid cooling system. Specifically, as shown in the example... Figures 1-3 As shown, the anti-condensation control method for the CDU liquid cooling system of this application includes: S101: The controller 4 receives temperature and humidity data transmitted by the temperature and humidity sensor 37 and liquid supply temperature data transmitted by the first temperature sensor 30, and calculates the current dew point temperature using the temperature and humidity data.

[0037] Optionally, controller 4 is the core computing and control unit of the CDU liquid cooling system, responsible for interpreting computer instructions and processing data. It is the brain of the computer, managing the operating system and applications. Controller 4 performs internal calculations, executes program instructions stored in system memory, and controls the operation of other devices in the liquid cooling system based on these instructions. Specifically, controller 4 can work with all sensors and other controlled devices in the liquid cooling system (such as electric valve 14, replenishment pump 34, etc.).

[0038] In one embodiment, the controller 4 can be a PLC (Programmable Logic Controller). The temperature and humidity sensor 37, the first temperature sensor 30, and the controller 4 communicate via analog input and analog output modules. Specifically, the temperature and humidity sensor 37 can be directly connected to the controller 4. On the secondary side, the liquid supply temperature data of the first temperature sensor 30 is communicated with the PLC through analog input and analog output modules. The electric valve 14 on the primary side is connected to the PLC through analog input and analog output modules.

[0039] Optionally, the controller 4 transmits data to the temperature and humidity sensor 37 and the first temperature sensor 30 via wired or wireless means. The temperature and humidity sensor 37 and the first temperature sensor 30 can periodically send the detected data to the controller 4, and the controller 4 can also periodically send data acquisition requests to the temperature and humidity sensor 37 and the first temperature sensor 30. Based on the received requests, the temperature and humidity sensor 37 and the first temperature sensor 30 send temperature and humidity data and liquid supply temperature data for the current period or a predetermined time period.

[0040] Optionally, the controller 4 can periodically calculate the current dew point temperature, or calculate the current dew point temperature after receiving a dew point temperature calculation instruction, or perform the dew point temperature calculation operation after detecting that the object being cooled on the secondary side (such as the unit) has started working.

[0041] Optionally, the temperature and humidity data may include the current dry-bulb temperature and relative humidity. The current dew point temperature is calculated using this data, including: determining the current dry-bulb temperature and relative humidity based on the data; calculating the actual water vapor pressure based on the dry-bulb temperature and relative humidity; and calculating the current dew point temperature based on the actual water vapor pressure. By calculating the dew point temperature in real time, the system quickly adapts to constantly changing environments, avoiding mismatches between the actual and actual dew point temperatures, thus improving the anti-condensation effect.

[0042] Optionally, the saturated vapor pressure can be calculated first, then the actual vapor pressure can be calculated based on the saturated vapor pressure, and finally the dew point temperature can be calculated using the actual vapor pressure. Therefore, calculating the actual vapor pressure based on dry-bulb temperature and relative humidity includes: calculating the current saturated vapor pressure based on the dry-bulb temperature; and calculating the current actual vapor pressure based on relative humidity and saturated vapor pressure. Wherein, relative humidity = (actual vapor pressure / saturated vapor pressure) × 100%, actual vapor pressure (e) is the partial pressure of water vapor in the air, and saturated vapor pressure (e) is the partial pressure of water vapor in the air. s The saturated vapor pressure is the maximum partial pressure of water vapor that air can hold at the same temperature. It is only related to temperature; the higher the temperature, the greater the saturated vapor pressure.

[0043] In one embodiment, the formula for calculating saturated vapor pressure can be:

[0044] Where T is the dry-bulb temperature, in degrees Celsius. Let be the saturated vapor pressure at temperature T, in hectopascals, and exp be the natural exponential function.

[0045] The formula for calculating actual water vapor pressure is:

[0046] In the formula, e is the actual water vapor pressure, in hectopascals, and RH is the relative humidity, in cubic meters.

[0047] Optionally, the dew point temperature is the temperature at which air cools to saturation (relative humidity reaches 100%). Dew will form when the surface temperature of an object is below the dew point temperature. The formula for calculating the dew point temperature is:

[0048] In the formula, Let be the current dew point temperature, and ln be the natural logarithm function.

[0049] S102: If the current supply temperature meets the dew point temperature condition based on the supply temperature data, then obtain the dew point comparison temperature corresponding to the current dew point temperature and the target value of the supply temperature, and control the opening degree of the electric valve 14 based on the comparison result between the dew point comparison temperature and the target value of the supply temperature.

[0050] Optionally, the dew point temperature conditions include the current liquid supply temperature being less than the dew point temperature threshold within a first preset time period, and the dew point comparison temperature being greater than the dew point temperature threshold and the dew point temperature being greater than the dew point temperature.

[0051] In one embodiment, the dew point comparison temperature can be the dew point temperature + 3 degrees Celsius, and the dew point temperature threshold can be the dew point temperature + 2 degrees Celsius. The difference between the dew point comparison temperature, the dew point temperature threshold, and the dew point temperature can also be other values, which can be set by the user according to actual needs and the temperature and humidity changes in the environment where the liquid cooling system is located; no limitation is imposed here.

[0052] Optionally, the CDU liquid cooling system also includes a display screen 5, and the controller 4 is connected to the display screen 5. The determination of the dew point temperature condition includes: determining the dew point temperature threshold based on the current dew point temperature; if the current liquid supply temperature is less than the dew point temperature threshold and the time less than the dew point temperature threshold reaches a first preset time, then it is determined that the dew point temperature condition is met, and the system enters the anti-condensation mode, and displays alarm information on the display screen 5.

[0053] Optionally, the alarm information can be text, images, animations, or other information that can quickly alert the user. The controller 4 can also connect to a speaker, which can transmit voice information for the alarm when sending alarm information via the display screen 5. Optionally, the controller 4 can also connect to wireless communication tools such as Bluetooth or IoT devices, and send alarm information to the user's terminal (such as a mobile phone) via these wireless communication tools.

[0054] In one embodiment, the preset time can be 30s, and the dew point temperature threshold can be dew point temperature + 2℃. During the operation of the liquid cooling system, if the controller 4 detects that the liquid supply temperature T2 < [dew point temperature + 2℃], and this situation lasts for 30s, the controller 4 can display on the screen 5 to prompt "the liquid supply temperature is close to the dew point temperature".

[0055] Optionally, the opening of the electric valve 14 is controlled based on the comparison result between the dew point comparison temperature and the target value of the liquid supply temperature, including: if it is determined that the dew point comparison temperature is greater than the target value of the liquid supply temperature, then the dew point comparison temperature is determined as the temperature regulation target value, and the opening of the electric valve 14 is adjusted based on the temperature regulation target value.

[0056] In one embodiment, the dew point comparison temperature is [dew point temperature + 3°C]. [Dew point temperature + 3°C] is compared with the set target value of the liquid supply temperature. If [dew point temperature + 3°C] > the target value of the liquid supply temperature, then [dew point temperature + 3°C] is used as the target value for temperature regulation, and the opening degree of the electric valve 14 on the primary side is controlled to be reduced, thereby increasing the liquid supply temperature.

[0057] Optionally, when the dew point comparison temperature is less than the target value of the liquid supply temperature, the opening degree of the electric valve 14 is controlled according to the comparison result between the dew point comparison temperature and the target value of the liquid supply temperature, including: if it is determined that the dew point comparison temperature is less than or equal to the target value of the liquid supply temperature, the target value of the liquid supply temperature is determined as the temperature regulation target value, and the opening degree of the electric valve 14 is controlled based on the temperature regulation target value.

[0058] Optionally, the target value of the liquid supply temperature can be set according to actual needs. This target value is lower than the preset maximum temperature (the highest temperature that the liquid cooling system can reach during normal operation). Different target values ​​of the liquid supply temperature can be set for different heat dissipation objects connected to different secondary sides (such as units with different power and heat dissipation requirements), or different target values ​​of the liquid supply temperature can be set according to the current ambient temperature to adapt to the current environment.

[0059] Optionally, the opening degree of the electric valve 14 can be controlled using a PID algorithm. The opening degree of the electric valve 14 can be gradually reduced, and after the opening degree is reduced, the liquid supply temperature on the secondary side is monitored. If it is determined that the current liquid supply temperature is no longer lower than the dew point temperature threshold, the opening degree adjustment is stopped.

[0060] Optionally, to prevent the liquid supply temperature from being too high, the opening of the electric valve 14 is adjusted based on the temperature adjustment target value, including: reducing the opening of the electric valve 14 based on the temperature adjustment target value, detecting the current liquid supply temperature on the secondary side; if it is determined that the current liquid supply temperature meets the exit condition, then exiting the anti-condensation mode and stopping the adjustment of the opening.

[0061] Optionally, determining that the current liquid supply temperature meets the exit condition includes: if the difference between the current liquid supply temperature and the current dew point temperature within a second preset time period is greater than or equal to the dew point control temperature, or the current liquid supply temperature exceeds the maximum temperature, then the exit condition is determined to be met. Wherein, when calculating the difference, the current liquid supply temperature is greater than the current dew point temperature.

[0062] In one embodiment, the liquid cooling system is used in a data center, with a maximum temperature of 40°C. During the adjustment of the opening of the electric valve 14, the liquid supply temperature of the second transmission pipeline is monitored. When the liquid supply temperature is detected to be close to the maximum temperature (e.g., the difference between the maximum temperature and the liquid supply temperature is less than 1°C), the amplitude and frequency of the opening adjustment are reduced. When the liquid supply temperature is equal to or exceeds the maximum temperature, it is determined that the exit condition has been met, and the condensation mode is exited. This method avoids excessively high liquid supply temperatures that could damage the liquid cooling system and severely affect heat dissipation. Furthermore, after exiting the anti-condensation mode, the opening of the electric valve 14 can be adjusted according to the set liquid supply temperature.

[0063] In one embodiment, the dew point control temperature can be 3 degrees Celsius. During the adjustment of the opening of the electric valve 14, it is detected whether the current supply temperature - dew point temperature ≥ exit dew point control temperature, and the time for which this difference is greater than or equal to the dew point control temperature reaches 60 seconds (or other time lengths, the specific time length can be determined according to actual needs). If so, it is determined that the exit condition is met, the condensation mode is exited, and the opening adjustment is stopped, thereby avoiding the problem of frequent entry and exit from the condensation mode.

[0064] Optionally, adjusting the opening of the electric valve 14 includes: lowering the lower limit of the opening of the electric valve 14 to generate a new opening adjustment range; and gradually adjusting the opening of the electric valve 14 according to the new opening adjustment range and the current liquid supply temperature on the secondary side.

[0065] In one embodiment, after entering the anti-condensation mode, the lower limit of the opening of the electric valve 14 can be automatically reduced. For example, if the original setting of the opening of the electric valve 14 is 30%-100%, when the anti-condensation mode is triggered, the program will automatically change the opening of the electric valve 14 to 0-100%. After obtaining the new opening adjustment range, the opening of the electric valve 14 can be gradually reduced at intervals of 5% (or other sizes).

[0066] In one embodiment, the opening of the electric valve 14 can be adjusted according to the target value of the liquid supply temperature, specifically, the target value of the liquid supply temperature is determined to be T0. If the actual liquid supply temperature T > T0, the electric valve 14 is PID-regulated to increase the opening of the electric valve 14, thereby increasing the circulation volume on the primary side and cooling the secondary side coolant until the target temperature of the coolant stabilizes within the target value range. If the primary side regulating valve is 100% fully open and the actual liquid supply temperature still cannot be reduced to the target value, the primary side regulating valve remains 100% fully open. If the actual liquid supply temperature T < T0, the electric valve 14 is PID-regulated to decrease the opening of the electric valve 14, thereby reducing the circulation volume on the primary side and heating the secondary side liquid until the target temperature stabilizes within the target value range. If the primary side regulating valve is closed to the minimum opening (which can be set), and the actual liquid supply temperature still cannot be raised to the target value, the primary side regulating valve remains at the minimum opening. At this time, the liquid cooling system alerts maintenance personnel to intervene quickly to avoid condensation.

[0067] Compared to existing technologies, the anti-condensation control method for CDU liquid cooling systems in this application is used in CDU liquid cooling systems with a primary side, a secondary side, and a controller. The primary side is equipped with an electric valve for controlling the flow rate, and the secondary side is equipped with a temperature and humidity sensor for detecting the ambient temperature and a first temperature sensor for detecting the supply liquid temperature. The controller is connected to the electric valve and the temperature and humidity sensor respectively. The method includes: the controller receiving temperature and humidity data transmitted from the temperature and humidity sensor and supply liquid temperature data transmitted from the first temperature sensor; calculating the current dew point temperature using the temperature and humidity data; and determining, based on the supply liquid temperature data, that the current supply liquid temperature meets the requirements. The dew point temperature condition is determined by obtaining the dew point comparison temperature and the target value of the liquid supply temperature corresponding to the current dew point temperature. The opening degree of the electric valve is controlled based on the comparison result between the dew point comparison temperature and the target value of the liquid supply temperature. The dew point temperature condition includes the current liquid supply temperature being less than the dew point temperature threshold within a preset time period, and the dew point comparison temperature being greater than the dew point temperature threshold and greater than the dew point temperature. This embodiment of the application can determine in real time whether there is a risk of condensation and control the opening degree of the electric valve to adjust the flow rate on the primary side based on the determination result. This can effectively avoid condensation on the surface of the secondary side pipeline, reduce the risk of electrical short circuits and equipment corrosion, and improve equipment safety.

[0068] The terms "first," "second," "third," "fourth," "1," "2," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in a sequence other than that shown in the illustrations or text descriptions.

[0069] It should be understood that although arrows indicate various operation steps in the flowcharts of this application's embodiments, the order in which these steps are implemented is not limited to the order indicated by the arrows. Unless explicitly stated herein, in some implementation scenarios of this application's embodiments, the implementation steps in each flowchart can be executed in other orders as required. Furthermore, some or all steps in each flowchart, based on the actual implementation scenario, may include multiple sub-steps or multiple stages. Some or all of these sub-steps or stages can be executed at the same time, and each sub-step or stage can also be executed at different times. In scenarios where execution times differ, the execution order of these sub-steps or stages can be flexibly configured according to requirements, and this application's embodiments do not limit this.

[0070] The above description is only an optional implementation method for some implementation scenarios of this application. It should be noted that for those skilled in the art, other similar implementation methods based on the technical concept of this application without departing from the technical concept of this application also fall within the protection scope of the embodiments of this application.

Claims

1. A method for preventing condensation control in a CDU liquid cooling system, characterized in that, For a CDU liquid cooling system comprising a primary side, a secondary side, and a controller, wherein the primary side is provided with an electric valve for controlling flow rate, the secondary side is provided with a temperature and humidity sensor for detecting ambient temperature and a first temperature sensor for detecting the supply liquid temperature, and the controller is connected to the electric valve and the temperature and humidity sensor respectively, the method comprising: The controller receives temperature and humidity data transmitted by the temperature and humidity sensor and liquid supply temperature data transmitted by the first temperature sensor, and uses the temperature and humidity data to calculate the current dew point temperature. If the current supply temperature is determined to meet the dew point temperature condition based on the supply temperature data, then the dew point comparison temperature corresponding to the current dew point temperature and the target value of the supply temperature are obtained. The opening degree of the electric valve is controlled according to the comparison result between the dew point comparison temperature and the target value of the supply temperature. The dew point temperature condition includes the current supply temperature being less than the dew point temperature threshold within a preset time period, and the dew point comparison temperature being greater than the dew point temperature threshold and the dew point temperature being greater than the dew point temperature.

2. The anti-condensation control method for a CDU liquid cooling system according to claim 1, characterized in that, Calculating the current dew point temperature using the aforementioned temperature and humidity data includes: Determine the current dry-bulb temperature and relative humidity based on the temperature and humidity data, and calculate the actual water vapor pressure based on the dry-bulb temperature and relative humidity. Calculate the current dew point temperature based on the actual water vapor pressure.

3. The anti-condensation control method for a CDU liquid cooling system according to claim 2, characterized in that, The calculation of actual water vapor pressure based on the dry-bulb temperature and the relative humidity includes: Calculate the current saturated vapor pressure based on the dry bulb temperature; The current actual water vapor pressure is calculated based on the relative humidity and the saturated water vapor pressure.

4. The anti-condensation control method for a CDU liquid cooling system according to claim 1, characterized in that, The CDU liquid cooling system also includes a display screen, and the controller is connected to the display screen. The determination of the dew point temperature condition includes: Determine the dew point temperature threshold based on the current dew point temperature; If the current liquid supply temperature is lower than the dew point temperature threshold and the time it is lower than the dew point temperature threshold reaches a first preset time, then it is determined that the dew point temperature condition is met, and the anti-condensation mode is entered, and alarm information is displayed on the display screen.

5. The anti-condensation control method for a CDU liquid cooling system according to claim 4, characterized in that, The step of controlling the opening degree of the electric valve based on the comparison result of the dew point comparison temperature and the target value of the liquid supply temperature includes: If the dew point comparison temperature is determined to be greater than the target value of the liquid supply temperature, then the dew point comparison temperature is determined as the temperature adjustment target value, and the opening degree of the electric valve is adjusted based on the temperature adjustment target value.

6. The anti-condensation control method for a CDU liquid cooling system according to claim 5, characterized in that, Adjusting the opening degree of the electric valve based on the target temperature value includes: Based on the temperature regulation target value, reduce the opening of the electric valve and detect the current liquid supply temperature on the secondary side; If the current liquid supply temperature is determined to meet the exit conditions, then exit the anti-condensation mode and stop adjusting the opening degree.

7. The anti-condensation control method for a CDU liquid cooling system according to claim 6, characterized in that, Determining that the current supply temperature meets the exit conditions includes: If it is determined that the difference between the current liquid supply temperature and the current dew point temperature is greater than or equal to the dew point control temperature or the current liquid supply temperature exceeds the maximum temperature within the second preset time period, then the exit condition is determined to be met.

8. The anti-condensation control method for a CDU liquid cooling system according to claim 5, characterized in that, The step of controlling the opening degree of the electric valve based on the comparison result of the dew point comparison temperature and the target value of the liquid supply temperature includes: If the dew point comparison temperature is determined to be less than or equal to the liquid supply temperature target value, then the liquid supply temperature target value is determined as the temperature regulation target value, and the opening degree of the electric valve is controlled based on the temperature regulation target value.

9. The anti-condensation control method for a CDU liquid cooling system according to claim 5, characterized in that, The adjustment of the opening degree of the electric valve includes: Lowering the lower limit of the opening of the electric valve generates a new opening adjustment range; The opening of the electric valve is gradually adjusted according to the new opening adjustment range and the current liquid supply temperature on the secondary side.

10. A CDU liquid cooling system, characterized in that, The CDU liquid cooling system includes a primary side, a secondary side, and a controller. The controller is connected to an electric valve in the primary side, a temperature and humidity sensor in the secondary side, and a first temperature sensor. The CDU liquid cooling system implements the method described in any one of claims 1-9 through the controller.

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