A data center liquid cooling system

Abstract

The application discloses a data center liquid cooling system. The liquid cooling CDU unit of the data center liquid cooling system is arranged outside a machine room, a first liquid path of a liquid cooling primary side heat exchange unit forms an outer cooling liquid loop with a cooling tower system, a liquid cooling secondary side liquid supply and return pipeline system comprises a first liquid supply ring-shaped loop, a first liquid return ring-shaped loop, a liquid supply branch and a liquid return branch, a liquid outlet end of a second liquid path of the liquid cooling primary side heat exchange unit, a first flow channel of the liquid cooling CDU unit, the first liquid supply ring-shaped loop, the liquid supply branch, a liquid cooling flow channel in a server, the liquid return branch, the first liquid return ring-shaped loop, a second flow channel of the liquid cooling CDU unit and a liquid inlet end of the second liquid path are connected in sequence to form an inner cooling liquid loop for inner cooling liquid flow, and a liquid cooling intermediate side heat recovery unit is arranged between the liquid cooling primary side heat exchange unit and the liquid cooling CDU unit to recover heat. The data center liquid cooling system has good heat exchange capacity, low risk of outer cooling liquid water quality pollution and low probability of pipeline blockage.

Description

Technical Field

[0001] This invention relates to the field of data center heat dissipation technology, and in particular to a data center liquid cooling system. Background Technology

[0002] A data center is a facility that centrally stores, manages, processes, and distributes data. Servers are the core component of a data center, primarily used for processing, storing, and transmitting data. With the continuous increase in server power density and increasingly stringent requirements for data center energy efficiency and carbon emissions, the energy efficiency requirements for liquid-cooled server systems are becoming increasingly stringent. Liquid-cooled server systems include cold-plate liquid cooling systems and immersion liquid cooling systems. Compared to immersion liquid cooling systems, cold-plate liquid cooling systems have a lower overall investment level, are easier to maintain, require less modification to existing IT hardware configurations, and do not have significant compatibility issues, which facilitates the further promotion and application of this technology.

[0003] Cold plate liquid cooling systems directly cool the server chips by creating metal cavities within them and circulating coolant. Existing cold plate liquid cooling systems typically include a closed-loop cooling tower system, a Coolant Distribution Unit (CDU), and a return piping system. Servers are generally mounted in traditional racks, with the CDU positioned between rack rows. The return piping system is mounted on the rack and includes pipes for centralized supply and return of coolant. It connects to the CDU via secondary piping to form an indoor ring-shaped coolant supply system for server cooling. The closed-loop cooling tower system connects to the CDU via primary piping to form an outdoor ring-shaped coolant supply system.

[0004] However, the above arrangement currently has the following problems:

[0005] 1. CDUs are installed between rack rows, and the primary and secondary piping often runs through the entire computer room. The piping system interferes with the installation of other subsystems in the computer room to varying degrees, making the installation more complicated and the risk of leakage is also higher. In addition, the size and heat exchange capacity of CDUs installed between rack rows are limited, resulting in a limited number of CDUs when deployed in high-density racks at the end, and making it impossible to deploy and apply larger CDUs with greater heat exchange capacity.

[0006] 2. The coolant circulates within the cold plate liquid cooling system. The coolant flowing out of the closed cooling tower system is distributed by the CDU and then directly passes through the target server to dissipate heat from the server. This poses a high risk of coolant contamination and a tendency for the return pipeline system to become clogged.

[0007] 3. It is impossible to achieve reliable and efficient heat recovery in data center computer rooms. Summary of the Invention

[0008] The purpose of this invention is to provide a data center liquid cooling system with good heat exchange capacity, low risk of coolant contamination, low probability of blockage, and the ability to achieve efficient heat recovery in the computer room.

[0009] To achieve this objective, the present invention adopts the following technical solution:

[0010] A data center liquid cooling system includes: a cooling tower system located outside the computer room and used to provide external coolant; a liquid cooling primary-side heat exchange unit located outside the computer room, the liquid cooling primary-side heat exchange unit including a first liquid path and a second liquid path that are independent of each other and capable of heat exchange, the first liquid path being connected to the cooling tower system and forming an external coolant loop for the external coolant to flow through; a liquid cooling CDU unit located outside the computer room; and a liquid cooling secondary-side supply and return pipeline system located inside the computer room, the liquid cooling secondary-side supply and return pipeline system including a first supply loop, a first return loop, a supply branch, and a return branch, the two ends of the supply branch being respectively connected to two points of the first supply loop, and the return branch... The two ends of the path are respectively connected to two points of the first return loop. The server located in the computer room is used to connect in parallel between the supply branch and the return branch. The outlet end of the second liquid path, the first flow channel of the liquid-cooled CDU unit, the first supply loop, the supply branch, the liquid-cooled flow channel in the server, the return branch, the first return loop, the second flow channel of the liquid-cooled CDU unit, and the inlet end of the second liquid path are connected end to end to form an internal coolant loop for internal coolant circulation. The liquid-cooled intermediate heat recovery and utilization unit is located outside the computer room. The liquid-cooled intermediate heat recovery and utilization unit is used to recover heat between the liquid-cooled primary heat exchange unit and the liquid-cooled CDU unit.

[0011] Preferably, the data center liquid cooling system further includes a liquid cooling intermediate side annular supply and return pipeline system, which includes a second liquid supply annular loop and a second liquid return annular loop; at least two liquid cooling CDU units are provided, and each liquid cooling CDU unit is connected in parallel between the second liquid supply annular loop and the second liquid return annular loop.

[0012] Preferably, at least two liquid-cooled primary-side heat exchange units are provided, and each liquid-cooled primary-side heat exchange unit is connected in parallel between the second liquid supply ring circuit and the second liquid return ring circuit.

[0013] Preferably, the liquid-cooled intermediate heat recovery and utilization unit includes a waste heat recovery liquid path and a waste heat utilization liquid path that are independent of each other and capable of heat exchange. The inlet and outlet of the waste heat recovery liquid path are both connected to the second return liquid annular loop, and the waste heat utilization liquid path is used to connect with the heat-using equipment.

[0014] Preferably, the data center liquid cooling system further includes a liquid cooling intermediate side pressure regulating unit, wherein the liquid inlet and liquid return end of the liquid cooling intermediate side pressure regulating unit are both connected to the second liquid return annular loop.

[0015] Preferably, the cooling tower system includes an open cooling tower.

[0016] Preferably, the cooling tower system includes at least two open cooling towers, and at least two liquid-cooled primary-side heat exchange units are provided. The at least two open cooling towers and the at least two liquid-cooled primary-side heat exchange units are arranged in a one-to-one correspondence to form at least two external coolant circuits.

[0017] Preferably, the cooling tower system further includes a water outlet pipe, which connects the open cooling tower and the liquid-cooled primary heat exchange unit, and adjacent water outlet pipes are connected by a first parallel water pipe; the cooling tower system further includes a water return pipe, which connects the open cooling tower and the liquid-cooled primary heat exchange unit, and adjacent water return pipes are connected by a second parallel water pipe.

[0018] Preferably, the data center liquid cooling system further includes a water treatment unit connected in parallel between the first parallel water pipe and the second parallel water pipe.

[0019] Preferably, there are multiple supply branches and multiple return branches, and they are configured in a one-to-one correspondence; multiple servers are configured and arranged in multiple columns, with each column of servers connected in parallel between a set of supply branches and return branches.

[0020] The beneficial effects of this invention are:

[0021] The data center liquid cooling system provided by this invention places the liquid-cooled CDU units outside the server room and connects them via a first supply loop and a first return loop of the liquid cooling secondary side supply and return piping system. This not only frees the placement of the liquid-cooled CDU units from the constraints of server rack space, allowing for the installation of larger liquid-cooled CDU units with greater heat exchange capacity, but also simplifies the piping system within the server room and reduces the risk of leakage. The arrangement of the first supply loop, the first return loop, the supply branch, and the return branch also enables the data center liquid cooling system to connect to more servers, improving overall heat dissipation capacity and efficiency. Furthermore, by incorporating a liquid cooling primary side heat exchange unit between the liquid-cooled CDU units and the cooling tower system, this data center liquid cooling system forms independent external and internal coolant loops capable of heat exchange, reducing the likelihood of contamination of the internal coolant in the internal loop and thus lowering the probability of blockage in the liquid cooling secondary side supply and return piping system. In addition, the liquid-cooled intermediate heat recovery unit enables reliable and efficient heat recovery within the computer room. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a data center liquid cooling system provided in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the cooling tower system and the liquid-cooled primary heat exchange unit provided in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of a liquid-cooled primary-side heat exchange unit provided in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the liquid-cooled CDU unit and the liquid-cooled secondary side supply and return pipeline system provided in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the liquid-cooled primary heat exchange unit, the liquid-cooled intermediate annular supply and return liquid pipeline system, and the liquid-cooled CDU unit provided in the embodiments of the present invention.

[0027] In the picture:

[0028] 100. Cooling tower system; 110. Open cooling tower; 120. Water outlet pipe; 130. Water return pipe; 140. First parallel water pipe; 150. Second parallel water pipe; 160. Water treatment unit;

[0029] 200. Liquid-cooled primary heat exchange unit; 210. First liquid path; 220. Second liquid path;

[0030] 300. Liquid-cooled CDU unit;

[0031] 400. Liquid cooling secondary side supply and return pipeline system; 410. First supply loop; 420. First return loop; 430. Supply branch; 440. Return branch;

[0032] 500. Liquid-cooled intermediate-side heat recovery and utilization unit; 510. Waste heat recovery liquid path;

[0033] 600. Liquid-cooled intermediate side annular supply and return pipeline system; 610. Second supply annular loop; 620. Second return annular loop;

[0034] 700, Liquid-cooled intermediate-side constant pressure unit. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0038] Data centers are the foundational platform for IoT information technology services and a key support for the development of cloud computing, big data, and artificial intelligence. With technological advancements, the scale and number of data centers continue to expand. To ensure the normal operation of IT equipment, data center server rooms require uninterrupted cooling 24 / 7. This invention provides a data center liquid cooling system that can stably and efficiently cool the data center server room, allowing servers to operate at a suitable temperature and preventing server malfunctions due to overheating.

[0039] The following is for reference. Figures 1-5 The specific structure of the data center liquid cooling system according to an embodiment of the present invention is described.

[0040] Specifically, the data center liquid cooling system includes a cooling tower system 100, a liquid cooling primary-side heat exchange unit 200, a liquid cooling CDU unit 300, and a liquid cooling secondary-side supply and return pipeline system 400. The cooling tower system 100 is located outside the computer room and provides external coolant, typically cooling water. The liquid cooling primary-side heat exchange unit 200 is also located outside the computer room and includes a first liquid path 210 and a second liquid path 220 that are independent and capable of heat exchange. The first liquid path 210 is connected to the cooling tower system 100, forming an external coolant circuit for the external coolant. A cooling tower circulation pump is installed on the external coolant circuit. Driven by the cooling tower circulation pump, the external coolant flows within the external coolant circuit and completes heat exchange within the liquid cooling primary-side heat exchange unit 200. The liquid cooling CDU unit 300 is located outside the computer room and is used for distributing cooling capacity.

[0041] The liquid-cooled secondary-side supply and return piping system 400 is a piping structure installed within the computer room. Specifically, the liquid-cooled secondary-side supply and return piping system 400 includes a first supply loop 410, a first return loop 420, a supply branch 430, and a return branch 440. The two ends of the supply branch 430 are respectively connected to two points of the first supply loop 410, and the two ends of the return branch 440 are respectively connected to two points of the first return loop 420. The server is connected in parallel between the supply branch 430 and the return branch 440. The outlet end of the second liquid path 220, the first flow channel of the liquid-cooled CDU unit 300, the first supply loop 410, the supply branch 430, the liquid-cooled flow channel within the server, the return branch 440, the first return loop 420, the second flow channel of the liquid-cooled CDU unit 300, and the inlet end of the second liquid path 220 are connected end-to-end to form an internal coolant circuit for the flow of internal coolant. It should be noted that the internal coolant is generally cooling water. A liquid-cooled intermediate-side heat exchange circulation pump is installed in the internal coolant circuit. Driven by the liquid-cooled intermediate-side heat exchange circulation pump, the internal coolant can flow within the internal coolant circuit and complete heat exchange at the server, thereby accelerating the server's heat dissipation. The liquid-cooled intermediate-side heat recovery and utilization unit 500 is located outside the computer room. The liquid-cooled intermediate-side heat recovery and utilization unit 500 is used to recover heat between the liquid-cooled primary-side heat exchange unit 200 and the liquid-cooled CDU unit 300.

[0042] Compared to existing technologies that place liquid-cooled CDU units between rack rows and use liquid-cooled CDU units to directly supply cooling to servers, the data center liquid cooling system provided by this invention places the liquid-cooled CDU unit 300 outside the computer room and connects the first supply loop 410 and the first return loop 420 of the liquid cooling secondary side supply and return pipeline system 400 to the liquid-cooled CDU unit 300. This not only makes the placement of the liquid-cooled CDU unit 300 no longer affected by the space between rack rows, allowing for the installation of larger-sized liquid-cooled CDU units 300 with greater heat exchange capacity, but also simplifies the piping system in the computer room and reduces the risk of leakage. Meanwhile, the arrangement of the first supply loop 410, the first return loop 420, the supply branch 430, and the return branch 440 enables the data center liquid cooling system to connect more servers, improving the overall heat dissipation capacity and effect. Furthermore, because the internal coolant in the first supply loop 410 and the first return loop 420 can flow in both directions, the anti-clogging capability of the secondary supply and return pipeline system 400 is enhanced. In addition, by setting up a primary heat exchange unit 200 between the liquid-cooled CDU unit 300 and the cooling tower system 100, the data center liquid cooling system forms independent external and internal coolant loops capable of heat exchange. The internal and external coolant flow independently, and the external coolant flowing out of the cooling tower system 100 will not flow through the secondary supply and return pipeline system 400, reducing the probability of contamination of the internal coolant in the internal coolant loop and thus reducing the probability of blockage in the secondary supply and return pipeline system 400. In addition, the liquid-cooled intermediate heat recovery unit 500 enables reliable and efficient heat recovery within the computer room.

[0043] In some embodiments, the cooling tower system 100 includes an open cooling tower 110. The specific structure and working principle of the open cooling tower 110 are prior art and will not be detailed here. Compared to the drawbacks of prior art, such as lower heat dissipation efficiency, higher equipment cost, larger footprint, more complex operation and maintenance, and longer problem-solving time when using closed cooling towers or dry coolers, the open cooling tower 110 offers higher heat dissipation efficiency, lower initial equipment cost, smaller footprint, and easier maintenance.

[0044] Furthermore, the cooling tower system 100 includes at least two open cooling towers 110, and at least two liquid-cooled primary-side heat exchange units 200 are provided. The at least two open cooling towers 110 and the at least two liquid-cooled primary-side heat exchange units 200 are arranged in a one-to-one correspondence, forming at least two external coolant circuits. Multiple open cooling towers 110 are arranged in parallel with redundancy and placed on an outdoor rooftop, thereby achieving heat dissipation for the entire data center. This arrangement increases the cooling capacity of the external coolant flowing through the external coolant circuits, thus improving the data center's heat dissipation capacity. In a specific embodiment, such as... Figure 1 As shown, there are two open cooling towers 110 and two liquid-cooled primary heat exchange units 200. The two open cooling towers 110 and the two liquid-cooled primary heat exchange units 200 are connected in a one-to-one correspondence to form two parallel external coolant circuits.

[0045] Continue to refer to Figure 2 As shown, in some embodiments, the cooling tower system 100 further includes an outlet pipe 120 and a return pipe 130. Each set of open cooling towers 110 and liquid-cooled primary heat exchange units 200 are connected through a set of outlet pipes 120 and return pipes 130 to form a circulating liquid path. Specifically, the outlet pipe 120 is connected between the outlet of the open cooling tower 110 and the inlet of the liquid-cooled primary heat exchange unit 200, and the return pipe 130 is connected between the return port of the open cooling tower 110 and the outlet of the liquid-cooled primary heat exchange unit 200.

[0046] Furthermore, to enhance the anti-clogging capability of the external coolant circuit, adjacent return water pipes 130 are connected by a second parallel water pipe 150, and adjacent outlet water pipes 120 are connected by a first parallel water pipe 140. This arrangement ensures that when a blockage occurs in the external coolant circuit between a set of open cooling towers 110 and its corresponding liquid-cooled primary-side heat exchange unit 200, the external coolant flowing out of the open cooling tower 110 can flow to another liquid-cooled primary-side heat exchange unit 200 through the first parallel water pipe 140, or the external coolant in the liquid-cooled primary-side heat exchange unit 200 can flow back to another open cooling tower 110 through the second parallel water pipe 150, thereby improving the anti-clogging capability of the entire data center cooling system.

[0047] Furthermore, to improve the water quality of the external coolant flowing in the external coolant circuit, in some embodiments, the data center liquid cooling system further includes a water treatment unit 160, which is connected in parallel between the first parallel water pipe 140 and the second parallel water pipe 150. The water treatment unit 160 can filter and purify the external coolant. By treating the external coolant using the water treatment unit 160, the probability of blockage in the external coolant circuit is further reduced. It should be noted that the specific structure of the water treatment unit 160 is prior art and will not be detailed here. Any prior art mechanism that can improve water quality without affecting the normal operation of the data center liquid cooling system can be used as the water treatment unit 160.

[0048] The liquid-cooled primary-side heat exchange unit includes a cooling tower circulating pump, a plate heat exchanger, a liquid-cooled intermediate-side heat exchange circulating pump, a complete set of related valves, sensors, and control components. It should be noted that the liquid-cooled primary-side heat exchange unit is a mature module, and its specific structure and working principle are existing technologies, which will not be detailed here.

[0049] The liquid-cooled CDU unit 300 includes a plate heat exchanger connecting the intermediate side and the server side, a liquid-cooled secondary side circulation pump, a replenishment system, a complete set of related valves, sensors, water treatment accessories, an automatic control system, a constant pressure water replenishment and purification mechanism, and a mechanism for controlling, monitoring, and alarming the operation of the secondary side system. It should be noted that the liquid-cooled CDU unit 300 is a mature module, and its specific structure and working principle are existing technologies, which will not be detailed here.

[0050] Continue to refer to Figure 5 As shown, when there are multiple liquid-cooled CDU units 300, in order to improve the balance of cooling capacity distribution to the liquid-cooled CDU units 300, in some embodiments, the data center liquid cooling system further includes a liquid-cooled intermediate-side annular supply and return pipeline system 600. The liquid-cooled intermediate-side annular supply and return pipeline system 600 is a pipeline structure arranged in an annular distribution network. Specifically, the liquid-cooled intermediate-side annular supply and return pipeline system 600 includes a second liquid supply annular loop 610 and a second liquid return annular loop 620. At least two liquid-cooled CDU units 300 are provided. Each liquid-cooled CDU unit 300 is connected in parallel between the second liquid supply annular loop 610 and the second liquid return annular loop 620. Each liquid-cooled primary-side heat exchange unit 200 is connected in parallel between the second liquid supply annular loop 610 and the second liquid return annular loop 620.

[0051] In one specific embodiment, four liquid-cooled CDU units 300 are provided, and the four liquid-cooled CDU units 300 are connected in parallel between the liquid-cooled intermediate side annular supply and return liquid pipeline system 600 and the liquid-cooled secondary side supply and return liquid pipeline system 400.

[0052] In some embodiments, there are multiple supply branches 430 and return branches 440, and they are configured in a one-to-one correspondence. Multiple servers are configured and arranged in multiple columns, with each column of servers connected in parallel between a set of supply branches 430 and return branches 440. In one specific embodiment, referring to... Figure 4 As shown, there are four sets of liquid supply branches 430 and liquid return branches 440, which supply liquid to and return liquid to the four columns of servers respectively.

[0053] Continue to refer to Figure 5 As shown, in some embodiments, the liquid-cooled intermediate-side heat recovery and utilization unit 500 includes an independent waste heat recovery liquid path 510 and a waste heat utilization liquid path (not shown in the figure) capable of heat exchange. The inlet and outlet of the waste heat recovery liquid path 510 are both connected to the second return liquid ring loop 620, and the waste heat utilization liquid path is used to connect to heat-using equipment, such as household appliances. The liquid-cooled intermediate-side ring supply and return liquid pipeline system 600 adopts a ring distribution network layout, and the liquid-cooled intermediate-side heat recovery and utilization unit 500 is deployed on the liquid-cooled intermediate side. This ensures that the operation of the entire data center liquid cooling system does not negatively affect the normal operation of the liquid cooling system terminal, and also enables the direct recovery and utilization of high-temperature return liquid energy in the computer room.

[0054] Continue to refer to Figure 5 As shown, in some embodiments, the data center liquid cooling system further includes a liquid cooling intermediate-side pressure stabilizing unit 700, whose inlet and outlet ends are both connected to the second return annular loop 620. The liquid cooling intermediate-side pressure stabilizing unit 700 is used to maintain stable pressure within the internal coolant loop, preventing abnormal internal coolant flow caused by pressure instability. It should be noted that the specific structure of the liquid cooling intermediate-side pressure stabilizing unit 700 is a mature module, and its specific structure and working principle are existing technologies, which will not be detailed here.

[0055] In this embodiment, the entire data center liquid cooling system also includes a control system, which includes a centralized or distributed controller. For example, the controller can be a single microcontroller or a combination of multiple distributed microcontrollers. The microcontroller can run a control program to control the electronic components in the above modules to achieve their functions.

[0056] In summary, the data center liquid cooling system provided by this invention is a cold plate liquid cooling system. The open cooling tower system 100, the primary liquid cooling heat exchange unit 200, the liquid cooling CDU unit 300, the intermediate liquid cooling ring-shaped supply and return liquid pipeline system 600, the secondary liquid cooling supply and return liquid pipeline system 400, and the intermediate liquid cooling heat recovery and utilization unit 500 together constitute the entire data center computer room cold plate liquid cooling uninterrupted circulation heat exchange system. This enables large-scale, efficient, centralized, and low-cost construction and application of cold plate liquid cooling technology in the computer room, as well as more efficient operation in the future, which is conducive to the large-scale application of liquid cooling technology in the near future. Furthermore, the interconnected ring-shaped pipeline systems in this data center liquid cooling system can evenly distribute the flow to each liquid-cooled server rack and enable rack-level online maintenance. In addition, this data center liquid cooling system can also achieve efficient heat recovery and utilization within the computer room, enhancing the proportion and efficiency of heat recovery and utilization in the data center.

[0057] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A data center liquid cooling system, characterized in that, include: A cooling tower system (100) is located outside the machine room and is used to provide external coolant; A liquid-cooled primary heat exchange unit (200) is installed outside the machine room. The liquid-cooled primary heat exchange unit (200) includes a first liquid path (210) and a second liquid path (220) that are independent of each other and capable of heat exchange. The first liquid path (210) is connected to the cooling tower system (100) and forms an external cooling liquid circuit for the external cooling liquid to circulate. A cooling tower circulation pump is installed on the external cooling liquid circuit. A liquid-cooled CDU unit (300) is located outside the computer room; A liquid-cooled secondary side supply and return liquid pipeline system (400) is installed in the computer room. The liquid-cooled secondary side supply and return liquid pipeline system (400) includes a first supply loop (410), a first return loop (420), a supply branch (430), and a return branch (440). The two ends of the supply branch (430) are respectively connected to two points of the first supply loop (410), and the two ends of the return branch (440) are respectively connected to two points of the first return loop (420). A server installed in the computer room is used to be connected in parallel between the supply branch (430) and the return branch (440). The liquid outlet of the second liquid path (220), the first flow channel of the liquid-cooled CDU unit (300), the first liquid supply annular circuit (410), the liquid supply branch (430), the liquid-cooled flow channel in the server, the liquid return branch (440), the first liquid return annular circuit (420), the second flow channel of the liquid-cooled CDU unit (300) and the liquid inlet of the second liquid path (220) are connected end to end to form an internal coolant circuit for the flow of internal coolant; A liquid-cooled intermediate heat recovery unit (500) is installed outside the computer room. The liquid-cooled intermediate heat recovery unit (500) is used to recover heat between the liquid-cooled primary heat exchange unit (200) and the liquid-cooled CDU unit (300).

2. The data center liquid cooling system according to claim 1, characterized in that, The data center liquid cooling system also includes a liquid cooling intermediate side annular supply and return liquid pipeline system (600), which includes a second liquid supply annular loop (610) and a second liquid return annular loop (620). At least two liquid-cooled CDU units (300) are provided, and each liquid-cooled CDU unit (300) is connected in parallel between the second liquid supply loop (610) and the second liquid return loop (620).

3. The data center liquid cooling system according to claim 2, characterized in that, At least two liquid-cooled primary heat exchange units (200) are provided, and each liquid-cooled primary heat exchange unit (200) is connected in parallel between the second liquid supply ring circuit (610) and the second liquid return ring circuit (620).

4. The data center liquid cooling system according to claim 2, characterized in that, The liquid-cooled intermediate heat recovery and utilization unit (500) includes a waste heat recovery liquid path (510) and a waste heat utilization liquid path that are independent of each other and capable of heat exchange. The inlet and outlet of the waste heat recovery liquid path (510) are both connected to the second return liquid ring circuit (620). The waste heat utilization liquid path is used to connect with the heat-using equipment.

5. The data center liquid cooling system according to claim 2, characterized in that, The data center liquid cooling system also includes a liquid cooling intermediate side pressure regulating unit (700), the liquid inlet and return end of which are connected to the second return loop (620).

6. The data center liquid cooling system according to claim 1, characterized in that, The cooling tower system (100) includes an open cooling tower (110).

7. The data center liquid cooling system according to claim 6, characterized in that, The cooling tower system (100) includes at least two open cooling towers (110), and at least two liquid-cooled primary heat exchange units (200) are provided. The at least two open cooling towers (110) and the at least two liquid-cooled primary heat exchange units (200) are arranged in a one-to-one correspondence and form at least two external coolant circuits.

8. The data center liquid cooling system according to claim 7, characterized in that, The cooling tower system (100) also includes a water outlet pipe (120), which connects the open cooling tower (110) and the liquid-cooled primary heat exchange unit (200). Adjacent water outlet pipes (120) are connected by a first parallel water pipe (140). The cooling tower system (100) also includes a return water pipe (130), which connects the open cooling tower (110) and the liquid-cooled primary heat exchange unit (200). The adjacent return water pipes (130) are connected by a second parallel water pipe (150).

9. The data center liquid cooling system according to claim 8, characterized in that, The data center liquid cooling system also includes a water treatment unit (160), which is connected in parallel between the first parallel water pipe (140) and the second parallel water pipe (150).

10. The data center liquid cooling system according to any one of claims 1-9, characterized in that, The number of liquid supply branches (430) and liquid return branches (440) are both multiple, and they are set up one-to-one; The server is configured in multiple units and arranged in multiple columns. Each column of the server is connected in parallel between a set of liquid supply branches (430) and liquid return branches (440).

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