LNG-powered data center cooling system and its collaborative control method

Abstract

This invention discloses an LNG-powered data center cooling device and its collaborative control method. The data center cooling device includes an LNG pretreatment module, a heat exchange module, a cold storage module, a data center server, and a pump-driven two-phase loop cooling module. The pump-driven two-phase loop connects the LNG pretreatment module and the data center server, fully utilizing the LNG's cold energy to provide cooling for the data center server. The heat from the data center server is transferred to the pump-driven two-phase loop cooling module through a heat spreader. The heat spreader uses a variable cross-section groove capillary core flat plate heat pipe to improve the cooling performance and temperature uniformity of the data center server. The evaporative cooler is equipped with a valve-level self-protection structure to ensure precise refrigerant supply, and a stepped capillary core is installed at the top of the evaporative cooler to achieve efficient gas-liquid separation. Furthermore, the collaborative control method driven by the data center's cooling load demand enables continuous and stable cooling of the data center 24 hours a day, achieving the goal of efficient data center cooling.

Description

Technical Field

[0001] This invention relates to an LNG-cooled data center cooling device, specifically a data center cooling device for large data centers that combines a pump-driven two-phase circuit with LNG cooling energy. Background Technology

[0002] Data centers are the heart and brain of the digital industry, crucial for data and information collection. Therefore, with the development of 5G, the data center industry has experienced explosive growth in recent years, involving a large number of IT equipment, rack servers, and other related equipment. The total energy use of a data center can be divided into the energy consumption of IT equipment, cooling systems, and power supply systems, with cooling systems consuming approximately 40-50% of the total energy. Furthermore, during data center operation, cooling systems need to run continuously 24 hours a day to dissipate the heat generated by the equipment. Therefore, cooling systems are a key focus for data center performance optimization.

[0003] Traditionally, data centers are cooled using vapor compression refrigeration (VCR) systems. In these systems, refrigerant is compressed into a high-temperature, high-pressure gas by a compressor, then becomes a low-temperature, low-pressure two-phase fluid as it flows through an air-cooled / water-cooled condenser and a throttling valve. After undergoing a phase change in the evaporator, the refrigerant absorbs heat from the medium, and either cool air or cool water is supplied by the evaporator and delivered to the data center for cooling. However, data centers have very high internal heat flux densities, requiring 24 / 7 cooling even in cold winters, while traditional mechanical refrigeration systems must operate 24 hours a day to meet these requirements. This situation leads to a significant increase in power consumption and equipment operating costs when free cooling is not properly utilized, hindering energy efficiency and sustainable development of data centers.

[0004] LNG (Liquefied Natural Gas) is one of the major energy sources of the 21st century. Its high efficiency, energy saving, small size, convenient transportation, and clean and environmentally friendly characteristics have attracted worldwide attention, making it an important strategic energy reserve. During its gasification process, LNG releases a large amount of cold energy, most of which is currently released into the ocean, resulting in extreme energy waste. Effectively recovering and utilizing this energy is of paramount importance for energy conservation and alleviating energy shortages. However, LNG cold energy supply is intermittent; therefore, addressing this issue will be key to achieving efficient LNG utilization.

[0005] The pump-driven loop system is an excellent thermal control and cooling system that utilizes the heat absorption during evaporation and the heat release during condensation of the working fluid during its circulation process to collect and dissipate heat. It offers advantages such as active temperature control, long heat transfer distance, flexible structure, and high load capacity. It effectively solves the problem of insufficient cooling capacity in conventional cooling methods such as wind power. In the pump-driven loop system, the working fluid flows into the evaporator under the drive of a mechanical pump. After entering the evaporator, the working fluid absorbs heat and changes from a liquid single-phase state to a gas-liquid two-phase state. Then, the two-phase fluid flows through the condenser, releases heat, and becomes a liquid single-phase state again. It then re-enters the mechanical pump and then the evaporator, repeating this process. However, the pump-driven two-phase loop data center cooling system also faces challenges affecting efficient heat transfer, such as liquid droplets carried by the gaseous working fluid at the evaporator outlet, capillary limitation of heat transfer on the heat exchange plate, and uneven distribution of the cooling working fluid among the evaporators.

[0006] To address these issues, this invention aims to provide a cooling device for data centers. It employs a demand-coordinated control method, uses a pump-driven two-phase loop cooling system, and fully utilizes LNG cold energy and cold storage medium to provide cooling for server racks. This solves the problems of LNG cold energy waste, intermittent operation, and high data center cooling costs, achieving continuous 24-hour cooling for data centers and achieving high efficiency and energy saving. Summary of the Invention

[0007] In view of the shortcomings and deficiencies of the existing technology, the present invention aims to provide a data center cooling device and a collaborative control method that combines pump-driven circuits and LNG cold energy for large data centers.

[0008] The technical solution adopted by this invention to solve its technical problem is as follows:

[0009] An LNG-powered cold energy data center cooling device, characterized in that it comprises: an LNG pretreatment module, a heat exchange module, a cold storage module, a data center server, and a pump-driven two-phase circuit cooling module;

[0010] The LNG pretreatment module is connected to the heat exchange module and the cold storage module; the pump-driven two-phase circuit cooling module is connected to the heat exchange module, the cold storage module, and the data center server.

[0011] The pump-driven two-phase loop cooling module includes a heat spreader, a refrigerant pump, a storage tank, a media regulating valve assembly, and an evaporative cooler. The refrigerant flow is controlled by the refrigerant pump and the refrigerant regulating valve assembly. The storage tank regulates the evaporation temperature of the pump-driven two-phase loop. The refrigerant inlet of the evaporative cooler is connected to the refrigerant outlet of the heat exchange module and the cold storage module. The refrigerant outlet of the evaporative cooler is connected to the refrigerant return port of the heat exchange module and the cold storage module. The circulation flow of the entire system is regulated by the refrigerant pump. The refrigerant is propelled by the refrigerant pump to the data center server for heat absorption. After heat absorption, the refrigerant enters the heat exchange module and the cold storage module through heat transfer pipelines, where it exchanges heat with LNG, releasing heat and transforming into liquid. LNG flows out from the LNG pretreatment module, flows to the heat exchange module and the cold storage module, exchanges heat with the refrigerant, and then flows into the city's pipe network.

[0012] The data center server includes a rack and chips; the heat from the data center server is transferred to the pump-driven two-phase circuit cooling module through the heat spreader; the heat spreader adopts a variable groove capillary core flat plate heat pipe, the evaporation section of the heat spreader is set in the rack and connected to the heat-generating chip, and the condensation section of the heat spreader is set in the evaporative cooler and connected to the refrigerant. The refrigerant flows in the pump-driven two-phase circuit and carries away the heat generated by the chip;

[0013] The evaporation section is equipped with a first cross-section groove, a second cross-section groove, and a third cross-section groove, with the first cross-section groove extending into the condensation section. The first cross-section groove has a length of 1 / 3L and a width of 1 / 15W; the second cross-section groove has a length of 1 / 3L and a width of 1 / 15W; and the third cross-section groove has a length of 1 / 3L and a width of 1 / 15W, where L is the length of the evaporation section and W is the width of the evaporation section. A capillary wick structure is installed inside the groove, and the suction effect of the capillary wick structure drives the working fluid inside the pulsating heat pipe to circulate between the evaporation section and the condensation section.

[0014] When the LNG cooling capacity matches the heat load of the data center server, LNG enters the heat exchange module through the LNG pretreatment module to directly exchange heat with the refrigerant and cool the data center server. When the LNG cooling capacity exceeds the heat load of the data center server, LNG enters the cold storage module through the LNG pretreatment module to store the excess cooling capacity using the cold storage medium. When the LNG cooling capacity is low or unavailable, the stored cooling capacity is used to indirectly cool the data center server. When the LNG cooling capacity is less than the heat load of the data center server, LNG enters both the heat exchange module and the cold storage module through the LNG pretreatment module simultaneously, activating both direct and indirect cooling of the data center server. These three cooling methods work together to ensure the safe and stable operation of the cooling system.

[0015] This invention discloses an LNG-powered data center cooling device, employing a collaborative control method driven by data center cooling load demand to achieve continuous and stable cooling for 24 hours, thus achieving efficient data center cooling. Its working principle is as follows: During the circulation of refrigerant, a gas-liquid phase change occurs, carrying away heat generated in the data center servers. LNG provides cooling energy to the refrigerant. The circulation flow rate of the entire system is regulated by a refrigerant pump. The refrigerant is propelled by the pump to the data center servers to absorb heat. After absorbing heat, the refrigerant enters the heat exchange module and the cold storage module through heat transfer pipelines, exchanging heat with LNG and releasing heat to become liquid. LNG flows out from the LNG pretreatment module, flows to the heat exchange module and the cold storage module, exchanges heat with the refrigerant, and then flows into the municipal sewer network.

[0016] The LNG pretreatment module includes an LNG carrier, an LNG storage tank, a low-pressure pump, a high-pressure pump, a Stage I compressor, a recondenser, a Stage II compressor, a flare, a liquid-phase LNG pipeline, and a gaseous-phase LNG pipeline. LNG is transferred from the LNG carrier to the LNG storage tank via the liquid-phase LNG pipeline, while BOG (Boiled Air Gaseous) enters the flare from the LNG carrier via the gaseous-phase LNG pipeline for combustion. The LNG storage tank has one inlet and two outlets, which are connected to the liquid-phase LNG pipeline and the gaseous-phase LNG pipeline, respectively. The liquid-phase LNG pipeline has two branches: one branch returns to the high-pressure pump via the recondenser and enters the heat exchange module and the cold storage module; the other branch directly enters the heat exchange module and the cold storage module via the high-pressure pump. BOG from the LNG carrier and the storage tank is collected at the inlet of the Stage I compressor, enters the Stage I compressor, and then passes through the recondenser and the Stage II compressor in sequence. At the outlet of the Stage II compressor, it is combined with NG (Gas-Induced Gas) from the heat dissipation unit and enters the city's gas pipeline network. The LNG storage tank uses a double-walled metal structure to store cryogenic liquefied natural gas; the recondenser captures BOG (bottleneck gas) during LNG storage or processing and recondenses and liquefies it; the stage I compressor and stage II compressor raise the low-pressure BOG to the delivery pressure so that it can be smoothly introduced into the city pipeline network for use.

[0017] The heat exchange module includes a shell-and-tube heat exchanger.

[0018] The cold storage module includes a cold storage module and a cold storage working fluid. The cold storage heat exchanger assembly includes an LNG / refrigerant inlet, an LNG / refrigerant outlet, and N cold storage heat exchangers (N is an integer greater than or equal to 5). The N cold storage heat exchangers have the same three-dimensional fluid pipe structure. The single cold storage unit includes refrigerant channel I, refrigerant channel II, LNG channel I, LNG channel II, cold storage working fluid, and a snowflake-shaped fin structure. To address the intermittent operation of LNG cold energy supply, the freezing point temperature of the cold storage working fluid in the cold storage unit increases along the LNG flow direction (i.e., the melting point temperature decreases along the refrigerant flow direction) to ensure the full and efficient utilization of LNG cold energy. The snowflake-shaped fin structure extends diagonally outwards, forming three branches with each extension stage, i.e., the number of branches M = 3. To improve the heat exchange effect of the cold storage unit, the fin ends of each stage are distributed on the same straight line, and the initial length of each stage is taken to be the same value, i.e., satisfying the formula:

[0019] L0 = L1 = L2 = ... = L m (m = 0, 1, 2, ...)

[0020] Where L is the initial rib length of each rib level;

[0021] Furthermore, the recursive formula for the front and rear widths of each rib level satisfies the following formula:

[0022]

[0023] Where W is the initial rib length of each rib level.

[0024] The pump-driven two-phase loop cooling module includes a cabinet, a heat spreader, chips, and an evaporative cooler. The pump-driven two-phase loop connects the LNG pretreatment module and the data center server. Refrigerant flows within the pump-driven two-phase loop, carrying away the heat generated by the chips. To ensure temperature uniformity of the chips, a heat spreader is installed in the pump-driven two-phase loop cooling module. One end of the heat spreader is an evaporation section located inside the cabinet and connected to the heat-generating chips; the other end is a condensation section located inside the evaporative cooler and connected to the refrigerant.

[0025] The heat spreader is a variable-section groove capillary wick type flat plate heat pipe, which utilizes the suction effect of the capillary wick structure to drive the working fluid inside the pulsating heat pipe to circulate between the evaporation section and the condensation section. Within a server, various power consumption heat sources are distributed dispersedly, with some areas having high heat flux density and others having moderate heat flux density. This necessitates enhancing heat transfer in the evaporation section to achieve uniform temperature cooling. Furthermore, the steam flow rate gradually increases along the evaporation section of the heat spreader. For the same steam flow rate, a wider flow channel results in lower resistance, while a narrower flow channel results in higher flow resistance. We know that for grooved flat plate heat pipes, steam flow resistance is the main factor affecting the capillary heat transfer limit. To synergistically consider uniform temperature cooling in the evaporation section and improve the capillary heat transfer limit, this invention proposes a variable-section groove structure for flat plate heat pipes. The dimensions of the variable-section groove are: length 1 / 3L, width 1 / 15W; length 1 / 3L, width 1 / 15W; length 1 / 3L, width 1 / 15W; where L is the length of the evaporation section and W is the width of the evaporation section. Furthermore, a capillary wick structure is incorporated within the channel, which enhances the reflux of the liquid working fluid in the condensation section of the vapor chamber and increases the heat transfer area and capillary evaporation capacity of the evaporation section. In summary, the coupled design of the evaporation section's cross-sectional area and the channel's capillary wick significantly improves the cooling performance and temperature uniformity of data center servers.

[0026] The evaporative cooler is equipped with a stepped capillary liquid filter core. The wire mesh size of the capillary liquid filter core varies. The wire mesh aperture is largest and the mesh is sparsest near the axis of the stepped capillary liquid filter core. The wire mesh aperture is smallest and the mesh is densest on both sides of the stepped capillary liquid filter core, resulting in the strongest capillary suction effect. This effectively promotes the liquid droplets carried in the refrigerant vapor to enter the evaporative cooler, achieving efficient gas-liquid separation and enhancing the utilization of the refrigerant. The wire mesh aperture of the capillary liquid filter core decreases gradually from the center to both sides, and its aperture size is D. n =D0P n (0 < P < 1) n is an integer greater than 1.

[0027] The cooling control module includes a liquid storage tank, a refrigerant pump, a refrigerant regulating valve assembly, and a valve-level self-protection structure. The valve-level self-protection structure is located inside most of the evaporative coolers to control the amount of refrigerant in the evaporative coolers and ensure accurate refrigerant supply. The refrigerant flow is controlled by the refrigerant pump and the refrigerant regulating valve assembly. The liquid storage tank regulates the evaporation temperature of the pump-driven two-phase circuit.

[0028] The collaborative control method driven by data center cooling load demand includes a pump-driven two-phase loop multi-degree-of-freedom multi-objective temperature control strategy and an adaptive temperature control method. The multi-degree-of-freedom multi-objective temperature control strategy refers to adjusting multi-degree-of-freedom parameters (circulation flow rate, evaporator inlet subcooling control, and loop pressure level) of the pump-driven two-phase flow loop to achieve multi-objective (temperature level, temperature uniformity) temperature control of the data center servers. The adaptive temperature control method refers to using adaptive control methods to improve the robustness of the control system in the face of various disturbances and uncertainties, achieving precise temperature regulation.

[0029] The multi-degree-of-freedom, multi-objective temperature control strategy for the pump-driven two-phase loop includes a high-efficiency heat dissipation control loop and a high-precision temperature control loop. The high-efficiency heat dissipation control loop controls the evaporator inlet subcooling and circulation flow rate to ideal set values, thereby controlling the gas-liquid phase change initiation and boiling intensity within the microchannel to regulate heat dissipation intensity, ensuring efficient heat dissipation of the evaporator and optimizing the temperature level and uniformity of the data center server. The high-precision temperature control loop regulates the loop pressure level by adjusting the temperature control unit of the liquid storage tank, thereby regulating the evaporation temperature, and further regulating the temperature of the two-phase working fluid in the microchannel evaporator, ultimately controlling the temperature level of the data center server.

[0030] The LNG-powered data center cooling device utilizes LNG's cooling energy in the data center's computer room cooling system. When the LNG cooling capacity matches the data center server heat load, the LNG cooling energy directly exchanges heat with the heat exchange module, effectively removing the heat generated by the data center servers. When the LNG cooling capacity exceeds the data center server heat load, the LNG enters the cold storage module to exchange heat with the cold storage medium, storing the cooling energy. When the heat exchange module is unavailable, the LNG supply is low, or the data center's cooling demand is high, it can continue to supply cooling energy to the pump-driven two-phase loop cooling module. Based on the data center's cooling needs and the LNG supply, the system described in this invention includes the following operating modes:

[0031] LNG directly cools data centers:

[0032] When the LNG cooling capacity matches the heat load of the data center servers, the LNG direct cooling mode for the data center is activated. In this mode, valves III and IV are closed, while valves I and II are open. When the system starts operating, LNG stored in the LNG tank is driven by a low-pressure pump into the liquid LNG pipeline, and then by a high-pressure pump through valve II into the heat exchange module. In the heat exchanger, LNG exchanges heat with the refrigerant. After heat exchange, the LNG flows through a throttling valve into the city pipeline interface. The refrigerant, after absorbing cooling energy, flows through valve I into the pump-driven two-phase circuit. The refrigerant, driven by the refrigerant pump, flows through the refrigerant regulating valve into the evaporative cooler of the data center rack. The data center rack chips transfer heat to the heat spreader, which in turn transfers heat to the refrigerant in the evaporative cooler. After heat exchange, the refrigerant re-enters the heat exchange module for heat exchange, and this cycle repeats continuously, achieving direct LNG cooling of the data center.

[0033] LNG-powered cold storage for data centers:

[0034] When the LNG cooling capacity exceeds the heat load of the data center servers, the LNG direct cooling mode for the data center and the cold storage module are simultaneously activated for cold storage. In this mode, valves I, II, III, and IV are open. When the system starts operating, the LNG stored in the LNG tank is driven by a low-pressure pump into the liquid LNG pipeline, and then by a high-pressure pump flows through valves II and IV into the heat exchange module and the cold storage module, respectively. It exchanges heat with the cold storage medium in the cold storage module, and the LNG after heat exchange flows through a throttling valve into the municipal pipeline interface. The cold storage medium in the cold storage module absorbs cold energy and undergoes a phase change, storing the cold energy. When the LNG cooling capacity is low or unavailable, the stored cold energy is used to indirectly cool the data center servers. In the heat exchange module, LNG exchanges heat with the refrigerant, and the LNG after heat exchange flows through a throttling valve into the municipal pipeline interface; the refrigerant absorbs cold energy and flows through valve I into the pump-driven two-phase circuit. The refrigerant, driven by the refrigerant pump, flows through the refrigerant regulating valve into the evaporative cooler of the data center rack. The data center rack chips transfer heat to the heat exchange plate. The heat exchange plate, through the pressure imbalance between the hot and cold ends and between adjacent pipes, as well as the capillary suction effect of the working fluid pipe capillary wick of the heat exchange plate, causes the working fluid to oscillate and flow between the evaporation section and the condensation section, thereby transferring heat to the refrigerant in the evaporative cooler. After heat exchange, the refrigerant enters the stepped capillary liquid core. The capillary suction effect of the capillary wick causes the refrigerant droplets to flow back into the evaporative cooler. The refrigerant vapor re-enters the heat exchange module for heat exchange. This cycle repeats continuously, realizing the cooling of data center servers with LNG.

[0035] LNG direct and indirect combined cooling for data centers:

[0036] When the LNG cooling capacity is less than the heat load of the data center servers, both direct LNG cooling and indirect LNG storage cooling of the data center are activated simultaneously. In this mode, valves I, II, III, and IV are all open. When the system starts operating, LNG stored in the LNG tank is driven by a low-pressure pump into the liquid LNG pipeline, and then by a high-pressure pump flows through valves II and IV into the heat exchange module and the cold storage module, respectively. In the heat exchange module, LNG exchanges heat with the refrigerant from the data center. After heat exchange, the LNG flows through a throttling valve into the city's pipeline interface; the refrigerant absorbs the cold energy and flows through valve I into the pump-driven two-phase circuit. In the cold storage module, LNG exchanges heat with the cold storage medium. After heat exchange, the LNG flows through a throttling valve into the city's pipeline interface; the refrigerant from the data center exchanges heat with the cold storage medium, and after absorbing the cold energy, flows through valve IV into the pump-driven two-phase circuit. The refrigerant is driven by the refrigerant pump and flows through the refrigerant regulating valve into the evaporative cooler of the data center cabinet. The data center cabinet chip transfers heat to the heat spreader, which in turn transfers heat to the refrigerant in the evaporative cooler. After heat exchange, the refrigerant re-enters the heat exchange module and the cold storage module for heat exchange again. This cycle repeats continuously, achieving direct and indirect combined cooling of the data center by LNG.

[0037] The beneficial effects of this invention are:

[0038] (1) This invention uses LNG cold energy to provide cooling for data center systems by coupling LNG cold energy, which solves the problems of LNG cold energy waste and high data center cooling costs, makes full use of LNG energy, and effectively alleviates the energy shortage.

[0039] (2) This invention uses a pump-driven circulation loop in a data center cooling and heat dissipation system. The system is simple, highly reliable, and has the advantages of long heat transfer distance and flexible structure. It is an innovative low-energy, non-powered two-phase flow system.

[0040] (3) The vapor chamber in the pump-driven two-phase loop cooling module of this invention not only enhances the reflux of the liquid working fluid in the condensation section of the vapor chamber, but also increases the heat transfer area and capillary evaporation capacity of the evaporation section. The coupled design of the variable groove and the capillary wick in the evaporation section significantly improves the cooling performance and temperature uniformity of the data center server. The vapor chamber is a variable groove capillary wick type flat plate heat pipe, which uses the suction effect of the capillary wick structure to drive the working fluid inside the pulsating heat pipe to circulate in the evaporation and condensation sections. The variable groove structure is equipped in the evaporation section to coordinate the uniform cooling of the evaporation section and improve the capillary heat transfer limit, overcome the influence of steam flow resistance on the heat transfer efficiency of the evaporation section, and enhance the heat transfer area and capillary evaporation capacity of the evaporation section. The coupled design of the variable groove and the capillary wick in the evaporation section significantly improves the cooling performance and temperature uniformity of the data center server.

[0041] (4) The evaporator in the pump-driven two-phase circuit cooling module of the present invention adopts a valve-liquid level self-protection structure. The floating and falling of the float structure controls the opening and closing of the water inlet valve to ensure the accurate supply of refrigerant in the evaporator. At the same time, a stepped capillary liquid core is provided above the evaporator to realize efficient gas-liquid separation of the heated evaporating refrigerant and improve the utilization of refrigerant in the evaporator.

[0042] (5) This invention utilizes a cold storage heat exchanger for cold storage, enabling data centers to continuously and uninterruptedly supply cooling for 24 hours, achieving the goal of high efficiency and energy saving; at the same time, N cold storage heat exchangers are arranged end to end, the freezing point temperature of the cold storage working fluid increases along the LNG flow direction (i.e., the melting point temperature decreases along the refrigerant flow direction), and the fluid pipeline is equipped with a three-dimensional snowflake-shaped fin structure to enhance the heat transfer performance between the refrigerant, LNG and the cold storage phase change material.

[0043] (6) The present invention adopts a demand-driven collaborative control method, utilizes a pump-driven two-phase loop multi-degree-of-freedom multi-objective temperature control strategy and an adaptive temperature control method, and adjusts the heat dissipation intensity by controlling the gas-liquid phase change initiation point and boiling intensity in the microchannel to ensure efficient heat dissipation of the evaporator and optimize the temperature level and temperature uniformity of the data center server. Attached Figure Description

[0044] Figure 1 Schematic diagram of an LNG-powered data center cooling system;

[0045] Figure 2 This invention relates to a pump-driven two-phase circuit cooling module in an LNG-powered cold energy data center cooling device.

[0046] Figure 3 A schematic diagram of the principle of a cascade capillary liquid cooling system for a data center;

[0047] Figure 4 This is a schematic diagram of the valve-liquid level self-protection structure inside the evaporative cooler, where... Figure 4 a is a schematic diagram of the inlet valve opening. Figure 4 b is a schematic diagram of the inlet valve being closed;

[0048] Figure 5 This is a schematic diagram of the heat exchange plate in the LNG cold energy type data center cooling device of the present invention;

[0049] Figure 6 Schematic diagram of cross-section AA of the heat spreader

[0050] Figure 7 for Figure 6 Enlarged view of a portion of the heat exchange plate Figure I ;

[0051] Figure 8 This is a schematic diagram of the heat spreader's cross-sectional groove structure, in which... Figure 8 a is a schematic diagram of the cross-section of the heat spreader BB (i.e., a schematic diagram of the cross-section of the heat exchange channel I); Figure 8 b is a schematic diagram of the cross-section of the heat spreader CC (i.e., a schematic diagram of the cross-section of the heat exchange channel II); Figure 8 c is a schematic diagram of the cross-section of the heat spreader DD (i.e., a schematic diagram of the cross-section of the heat exchange channel III);

[0052] Figure 9 This is a schematic diagram of the cold storage module in the LNG cold energy data center cooling device of the present invention;

[0053] Figure 10 This is a schematic diagram of the internal structure of a single cold storage heat exchanger in a cold storage module.

[0054] Figure 11 This is a schematic diagram of the cross-section of a single cold storage heat exchanger in a cold storage module;

[0055] Figure 12 This invention relates to an LNG pretreatment module in an LNG-cooled data center cooling device.

[0056] The components include: 1. Data center server; 2. Heat exchange module; 3. Cold storage module; 31. Cold storage heat exchanger I; 32. Cold storage heat exchanger II; 33. Cold storage heat exchanger III; 34. Cold storage heat exchanger IV; 35. Cold storage heat exchanger V; 36. Refrigerant channel I; 37. Refrigerant channel II; 38. LNG channel I; 39. LNG channel II; 40. Cold storage working fluid; 41. Snowflake-shaped fin structure; 4. Throttling valve; 5. Regulating unit; 51. Valve I; 52. Valve II; 53. Valve III; 54. Valve IV; 6. LNG pretreatment module; 61. LNG carrier; 62. Stage I compressor; 63. Recondenser; 64. Stage II compressor; 65. High-pressure pump; 66. Low-pressure pump; 67. LNG storage tank. 7. Flare; 81. Liquid LNG pipeline; 82. Gas LNG pipeline; 7. Flare; 8. LNG pipeline; 9. Refrigerant pipeline; 11. Cabinet; 12. Evaporative cooler; 122. Evaporative cooler working fluid inlet; 123. Inlet valve; 124. Pin; 125. Control lever; 126. Fixing hole; 127. Float arm; 128. Float; 129. Hose; 13. Heat exchanger plate; 131. Heat exchanger plate cross-sectional groove structure; 132. Outer diameter of heat exchanger plate working fluid pipeline; 133. Heat exchanger plate working fluid pipeline capillary core; 134. Serrated ratchet; 135. Cavity; 14. Chip; 15. Buffer tank; 16. Refrigerant pump; 17. Refrigerant regulating valve assembly; 18. Valve-level self-protection structure; 19. Cascade capillary liquid core; 20. Suction core. Detailed Implementation

[0057] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. These embodiments are only provided for illustration and not for limiting the present invention.

[0058] Figure 1 This invention describes an LNG-powered cold-energy data center cooling device. It includes an LNG pretreatment module 6, a heat exchange module 2, a cold storage module 3, a data center server 1, a pump-driven two-phase loop cooling module, and a cooling control module. The LNG pretreatment module 6 is connected to the heat exchange module 2 and the cold storage module 3; the pump-driven two-phase loop cooling module is connected to the heat exchange module 2, the cold storage module 3, and the data center server 1.

[0059] The data center server 1 includes a rack 11 and a chip 14.

[0060] Figure 2This invention describes a pump-driven two-phase loop cooling module in an LNG-powered data center cooling device. It includes an evaporator cooler 12, a heat spreader 13, a buffer tank 15, a refrigerant pump 16, and a refrigerant regulating valve assembly 17. One end of the heat spreader 13 is an evaporation section housed within a cabinet 11 and connected to a heating element 14; the other end is a condensation section housed within the evaporator cooler 12 and connected to the refrigerant.

[0061] The refrigerant inlet of the evaporative cooler 12 is connected to the refrigerant outlet of the heat exchange module 2 and the cold storage module 3; the refrigerant outlet of the evaporative cooler 12 is connected to the refrigerant return port of the heat exchange module 2 and the cold storage module 3.

[0062] A stepped capillary liquid core structure 19 is provided at the top of the evaporative cooler 12. Figure 3 The principle of the stepped capillary liquid filter structure 19 is described (the figure shows a schematic diagram of the structure in the direction of gravity). The stepped capillary liquid filter structure 19 includes a liquid absorbent core 20. The diameter of the liquid absorbent core pores in the stepped capillary liquid filter structure decreases stepwise from the center to both sides, and the size satisfies the formula:

[0063] D n =D0P n (0 < P < 1; n is an integer greater than 1)

[0064] Where D0 is the size of the central absorbent core within the capillary core (i.e., the maximum absorbent core size of the capillary core), and its value ranges from 150 to 200 micrometers; D n Let n be the size of the nth stage capillary core within the capillary core. In this example, n = 3 and P = 1 / 2, meaning the capillary core has three sizes. The pore size of the capillary core decreases progressively from the center outwards, forming five regions of varying density. The region near the axis of the step-by-step capillary core has the largest pore size and the sparsest mesh; the region on both sides of the step-by-step capillary core has the smallest pore size and the densest mesh, resulting in the strongest capillary suction effect. This effectively promotes the return of condensate to the evaporator cooler 12, achieving droplet separation of the evaporative refrigerant and enhancing the utilization of the refrigerant.

[0065] The evaporative cooler 12 is also equipped with a valve-liquid level self-protection structure 18, see [link / reference] Figure 4 The valve-level self-protection structure 18 includes an inlet 122, an inlet valve 123, a pin 124, a control rod 125, a fixing hole 126, a float arm 127, a float 128, and a hose 129. Among these, Figure 4 'a' indicates that the inlet valve is open. Figure 4b indicates the liquid inlet valve is closed. When the liquid level in the evaporative cooler 12 drops, the float 128 causes the float arm 127 to descend, which in turn causes the control rod 125 to separate from the pin 124. The liquid inlet valve 123 opens, and the refrigerant flows through the refrigerant regulating valve 17 into the liquid inlet 122, and then into the evaporative cooler through the hose 129. As the refrigerant flows into the evaporative cooler, the float 128 floats accordingly. When the float 128 reaches a certain height, the control rod 125 aligns with the pin 124, applying pressure to the pin 124. At this time, the pin 124 applies pressure to the liquid inlet valve 123, closing the liquid inlet valve and preventing the refrigerant from flowing into the evaporative cooler. This cycle repeats continuously, ensuring a sufficient supply of refrigerant in the evaporative cooler 12.

[0066] Figure 5 This invention describes a schematic diagram of a vapor chamber in an LNG-powered data center cooling device, including a vapor chamber cross-sectional area structure 131, an outer diameter 132 of the working fluid pipe, and a capillary core 133 for the working fluid pipe. The circulating working fluid in the vapor chamber 13 absorbs heat generated by the chip 14 in the evaporation section. Under the suction of the capillary core structure 133, it flows to the condensation section of the vapor chamber 13. The refrigerant is propelled by the refrigerant pump 16 through the refrigerant regulating valve assembly 17 into the evaporator cooler 12, where it absorbs heat from the condensation section of the vapor chamber 13. After absorbing heat, the refrigerant enters the stepped capillary core 19 through a heat transfer pipeline. The droplets are separated by the stepped core, and the refrigerant vapor enters the heat dissipation unit. The buffer tank 15 has an independent temperature control unit for regulating the pressure inside the storage tank. By controlling the pressure in the storage tank, the evaporation temperature of the system can be adjusted.

[0067] See the heat spreader cross-sectional groove structure 131. Figure 7 and Figure 8 The vapor chamber plate cross-sectional groove structure 131 includes a first cross-sectional groove, a second cross-sectional groove, and a third cross-sectional groove within the evaporation section, wherein the first cross-sectional groove extends into the condensation section; the length of the first cross-sectional groove is 1 / 3L and the width is 1 / 15W; the length of the second cross-sectional groove is 1 / 3L and the width is 1 / 15W; the length of the third cross-sectional groove is 1 / 3L and the width is 1 / 15W; where L is the length of the evaporation section and W is the width of the evaporation section. One end of the vapor chamber plate 13, the evaporation section, is located inside the cabinet 11 and connected to the heating chip 14, while the other end, the condensation section, is located inside the evaporative cooler 12 and connected to the refrigerant. The circulating working fluid within the vapor chamber plate absorbs heat generated by the heating chip 14 in the evaporation section, generating bubbles. These bubbles rapidly expand and increase in pressure, and under the suction of the capillary wick 133 in the working fluid pipe of the vapor chamber plate, they push the working fluid towards the low-temperature condensation section. In the condensation section, the gaseous working fluid cools, contracts, and ruptures, causing a pressure drop. By utilizing the pressure imbalance between the hot and cold ends and between adjacent pipes, as well as the capillary suction effect of the working fluid core 133 in the heat spreader working fluid pipe, the working fluid oscillates and flows between the evaporation section and the condensation section, thereby achieving heat transfer.

[0068] Figure 9The diagram illustrates the structure of the cold storage module 3 in the LNG-cooled data center cooling device of this invention. The number of cold storage heat exchangers N is an integer greater than or equal to 5. In this example, N = 5, specifically cold storage heat exchangers 31, 32, 33, 34, and 35. Cold storage heat exchangers 31, 32, 33, 34, and 35 are arranged end-to-end, with the freezing point temperature of the internal cold storage medium 40 increasing along the LNG flow direction (i.e., the melting point temperature decreasing along the refrigerant flow direction).

[0069] Figure 10 A schematic diagram of the internal structure of a single cold storage heat exchanger in the cold storage module is described. Figure 11 Described Figure 10 A schematic diagram of the cross-section of a single cold storage heat exchanger in the cold storage module, including an LNG / refrigerant inlet, an LNG / refrigerant outlet, refrigerant channel I 36, refrigerant channel II 37, LNG channel I 38, LNG channel II 39, cold storage medium 40, and a snowflake-shaped fin structure 41. The snowflake-shaped fin structure fins 41 extend diagonally outwards in all directions. Each stage extends to form three branches, i.e., the number of branches M = 3 and the number of stages n = 1. To improve the heat exchange effect of the cold storage module, the fin ends of each stage are distributed on the same straight line, and the initial length of each stage is taken to be the same value, i.e., satisfying the formula:

[0070] L0 = L1 = L2 = ... = L n , n = 1, 2 ... N.

[0071] Where L0 is the length of the first-stage rib, L n Let be the length of the nth level rib;

[0072] Furthermore, the recursive formula for the front and rear widths of each rib level satisfies the following formula:

[0073] First-level rib width:

[0074] Width of the nth rib:

[0075] W0 is the width of the first-level rib; W1 = W3; W 3n-2 =W3 n W2 = 0.8W0; W 3n-1 =0.8W 3n-4 .

[0076] In this invention example, four levels of ribs are used, i.e., n = 0, 1, 2, 3, 4. That is:

[0077] L0 = L1 = L2 = L3 = L4

[0078]

[0079] Where W1 = W3; W4 = W6; W7 = W9; W 10 =W 12 ;W2=0.8W0; W5=0.8W2; W8=0.8W5; W 11 =0.8W8.

[0080] Figure 12 The present invention describes an LNG pretreatment module in an LNG-cooled data center cooling device, comprising an LNG carrier 61, a stage I compressor 62, a recondenser 63, a stage II compressor 64, a high-pressure pump 65, a low-pressure pump 66, an LNG storage tank 67, a flare 7, a liquid LNG pipeline 81, and a gaseous LNG pipeline 82. LNG is transferred from LNG carrier 61 to LNG storage tank 67 via liquid phase LNG pipeline 81, and BOG is transferred from LNG carrier 61 to flare 7 via gas phase LNG pipeline 82 for combustion. LNG storage tank 67 has one inlet and two outlets, which are connected to liquid phase LNG pipeline 81 and gas phase LNG pipeline 82, respectively. Liquid phase LNG pipeline 81 has two branches. One branch returns to high pressure pump 65 via recondenser 63 and enters heat exchange module 2 and cold storage module 3. The other branch directly enters heat exchange module 2 and cold storage module 3 via high pressure pump 65. BOG from LNG carrier 61 and LNG storage tank 67 is collected at the inlet of stage I compressor 62 and enters stage I compressor 62. Then it passes through recondenser 63 and stage II compressor 64 in sequence. At the outlet of stage II compressor 64, it is collected with NG from heat dissipation unit and enters the city pipeline network. LNG storage tank 67 uses a double-walled metal insulation structure to store cryogenic liquefied natural gas; recondenser 63 captures BOG during LNG storage or processing and recondenses and liquefies it; stage I compressor 62 and stage II compressor 64 raise the low-pressure BOG to the delivery pressure so that it can be smoothly entered into the city pipeline network for use.

[0081] The LNG-powered cold energy data center cooling device of this invention can operate in three different modes, as detailed below:

[0082] Operating Condition 1

[0083] When the LNG cooling capacity matches the heat load of the data center servers, the LNG direct cooling data center mode is activated. In this mode, valves III 53 and IV 54 are closed, while valves I 51 and II 52 are open. When the system starts running, the LNG stored in the LNG storage tank 67 is driven by the low-pressure pump 66 into the liquid phase LNG pipeline 81, and then driven by the high-pressure pump 65 through valve II into the heat exchange module 2. In the heat exchange module 2, the LNG exchanges heat with the refrigerant. After heat exchange, the LNG flows through the throttling valve 4 into the city pipeline interface; the refrigerant absorbs the cooling capacity and then flows through valve I 51 into the pump-driven two-phase circuit. The refrigerant is driven by the refrigerant pump 16 and flows through the refrigerant regulating valve 17 into the data center rack evaporative cooler 12. The data center rack chip 14 transfers heat to the heat spreader 13. The heat spreader 13 causes the working fluid to oscillate and flow between the evaporation section and the condensation section through the pressure imbalance between the hot and cold ends and between adjacent pipes, as well as the capillary suction effect of the working fluid pipe capillary 133 of the heat spreader, thereby transferring heat to the refrigerant in the evaporative cooler 12. After heat exchange, the refrigerant enters the stepped capillary liquid core 19. The capillary suction effect causes the refrigerant droplets to flow back into the evaporative cooler 12. The refrigerant vapor re-enters the heat exchange module 2 for heat exchange. This cycle repeats continuously, realizing the direct cooling of the data center by LNG.

[0084] Operating Condition 2

[0085] When the LNG cooling capacity exceeds the heat load of the data center servers, the LNG direct cooling mode for the data center and the cold storage module are simultaneously activated for cold storage. In this mode, valves I 51, II 52, III 53, and IV 54 are opened. When the system starts operating, the LNG stored in LNG storage tank 67 is driven by low-pressure pump 66 into liquid LNG pipeline 81, and then by high-pressure pump 65 flows through valves II 52 and IV 54 into heat exchange module 2 and cold storage module 3, respectively. It exchanges heat with the cold storage medium 40 in cold storage module 3. After heat exchange, the LNG flows through throttling valve 4 into the city pipeline interface. The cold storage medium 40 in cold storage module 3 absorbs cold energy and undergoes a phase change, storing the cold energy. When the LNG cooling capacity is low or unavailable, the stored cold energy is used to indirectly cool the data center servers. In heat exchange module 2, LNG exchanges heat with the refrigerant. After heat exchange, the LNG flows through throttling valve 4 into the city pipeline interface. The refrigerant absorbs cold energy and flows through valve I 51 into the pump-driven two-phase circuit. The refrigerant is driven by the refrigerant pump 16 and flows through the refrigerant regulating valve 17 into the data center rack evaporative cooler 12. The data center rack chip 14 transfers heat to the heat spreader 13. The heat spreader 13 causes the working fluid to oscillate and flow between the evaporation section and the condensation section through the pressure imbalance between the hot and cold ends and between adjacent pipes, as well as the capillary suction effect of the working fluid pipe capillary 133 of the heat spreader, thereby transferring heat to the refrigerant in the evaporative cooler 12. After heat exchange, the refrigerant enters the stepped capillary liquid core 19. The capillary suction effect causes the refrigerant droplets to flow back into the evaporative cooler 12. The refrigerant vapor re-enters the heat exchange module 2 for heat exchange. This cycle repeats continuously, realizing the direct cooling of the data center by LNG.

[0086] Operating Condition 3

[0087] When the LNG cooling capacity is less than the heat load of the data center servers, both direct LNG cooling and indirect LNG storage cooling of the data center are activated simultaneously. In this mode, valves I 51, II 52, III 53, and IV 54 are all open. When the system starts operating, LNG stored in LNG tank 67 is driven by low-pressure pump 66 into liquid LNG pipeline 81, and then by high-pressure pump 65 flows through valves II 52 and IV 54 into heat exchange module 2 and cold storage module 3, respectively. In heat exchange module 2, LNG exchanges heat with refrigerant from the data center. After heat exchange, LNG flows through a throttling valve into the city pipeline interface; the refrigerant absorbs the cold energy and flows through valve I 51 into the pump-driven two-phase circuit. In cold storage module 3, the cold storage medium 40 exchanges heat, and the LNG flows through throttling valve 4 into the city pipeline interface. The refrigerant from the data center exchanges heat with cold storage medium 40, and after absorbing the cold energy, the refrigerant flows through valve IV 54 into the pump-driven two-phase circuit. The refrigerant is driven by the refrigerant pump 16 and flows through the refrigerant regulating valve 17 into the data center rack evaporative cooler 12. The data center rack chip 14 transfers heat to the heat spreader 13. The heat spreader 13 causes the working fluid to oscillate and flow between the evaporation section and the condensation section through the pressure imbalance between the hot and cold ends and between adjacent pipes, as well as the capillary suction effect of the working fluid pipe capillary 133 of the heat spreader, thereby transferring heat to the refrigerant in the evaporative cooler 12. After heat exchange, the refrigerant enters the refrigerant ladder capillary liquid core structure 19. The capillary suction effect causes the refrigerant droplets to flow back into the evaporative cooler 12. The refrigerant vapor re-enters the heat exchange module 2 for heat exchange. This cycle repeats, realizing the direct cooling of the data center by LNG.

Claims

1. An LNG-powered data center cooling device, characterized in that, include: LNG pretreatment module, heat exchange module, cold storage module, data center server and pump-driven two-phase circuit cooling module; The LNG pretreatment module is connected to the heat exchange module and the cold storage module; the pump-driven two-phase circuit cooling module is connected to the heat exchange module, the cold storage module, and the data center server. The pump-driven two-phase loop cooling module includes a heat spreader, a refrigerant pump, a storage tank, a media regulating valve assembly, and an evaporative cooler. The refrigerant flow is controlled by the refrigerant pump and the refrigerant regulating valve assembly. The storage tank regulates the evaporation temperature of the pump-driven two-phase loop. The refrigerant inlet of the evaporative cooler is connected to the refrigerant outlet of the heat exchange module and the cold storage module. The refrigerant outlet of the evaporative cooler is connected to the refrigerant return port of the heat exchange module and the cold storage module. The circulation flow of the entire system is regulated by the refrigerant pump. The refrigerant is pushed by the refrigerant pump to the data center server for heat absorption. After heat absorption, the refrigerant enters the heat exchange module and the cold storage module through the heat transfer pipeline, where it exchanges heat with LNG, releasing heat and turning into liquid. LNG flows out from the LNG pretreatment module, flows to the heat exchange module and the cold storage module, exchanges heat with the refrigerant, and then flows into the city's pipe network. The data center server includes a rack and chips; the heat from the data center server is transferred to the pump-driven two-phase circuit cooling module through the heat spreader; the heat spreader adopts a variable groove capillary core flat plate heat pipe, the evaporation section of the heat spreader is set in the rack and connected to the heat-generating chip, and the condensation section of the heat spreader is set in the evaporative cooler and connected to the refrigerant. The refrigerant flows in the pump-driven two-phase circuit and carries away the heat generated by the chip; The evaporation section is equipped with a first cross-section groove, a second cross-section groove, and a third cross-section groove, with the first cross-section groove extending into the condensation section. The first cross-section groove has a length of 1 / 3L and a width of 1 / 15W; the second cross-section groove has a length of 1 / 3L and a width of 1 / 15W; and the third cross-section groove has a length of 1 / 3L and a width of 1 / 15W, where L is the length of the evaporation section and W is the width of the evaporation section. A capillary wick structure is installed inside the groove, and the suction effect of the capillary wick structure drives the working fluid inside the pulsating heat pipe to circulate between the evaporation section and the condensation section. When the LNG cooling capacity matches the heat load of the data center server, LNG enters the heat exchange module through the LNG pretreatment module to directly exchange heat with the refrigerant and cool the data center server. When the LNG cooling capacity exceeds the heat load of the data center server, LNG enters the cold storage module through the LNG pretreatment module to store the excess cooling capacity using the cold storage medium. When the LNG cooling capacity is low or unavailable, the stored cooling capacity is used to indirectly cool the data center server. When the LNG cooling capacity is less than the heat load of the data center server, LNG enters both the heat exchange module and the cold storage module through the LNG pretreatment module simultaneously, activating both direct and indirect cooling of the data center server. These three cooling methods work together to ensure the safe and stable operation of the cooling system.

2. The LNG-cooled data center cooling device according to claim 1, characterized in that, A stepped capillary liquid-absorbing core structure is provided at the top of the evaporative cooler; the stepped capillary liquid-absorbing core structure includes a liquid-absorbing core, the size of which decreases progressively from the center to both sides, and the size satisfies the formula: D n =D0P n Where D0 is the size of the central absorbent core inside the capillary liquid core; D n Let P be the size of the nth stage absorbent core within the fine-grained core; P is the decreasing coefficient, 0 < P < 1; n is the number of stages, n is an integer greater than 1.

3. The LNG-cooled data center cooling device according to claim 1, characterized in that, The evaporative cooler is also equipped with a valve for controlling the refrigerant flow in the evaporative cooler – a self-protecting structure for liquid level.

4. The LNG-cooled data center cooling device according to claim 3, characterized in that, The valve-level self-protection structure includes an inlet, an inlet valve, a pin, a control rod, a fixing hole, a float arm, a float, and a hose. When the liquid level in the evaporative cooler drops, the float arm descends, causing the control rod to separate from the pin. The inlet valve opens, and the refrigerant flows into the inlet through the refrigerant regulating valve and into the evaporative cooler through the hose. As the refrigerant flows into the evaporative cooler, the float floats. When the float reaches a certain height, the control rod and the pin coincide, applying pressure to the pin. At this point, the pin applies pressure to the inlet valve, closing it and preventing the refrigerant from flowing into the evaporative cooler.

5. The LNG-cooled data center cooling device according to any one of claims 1-4, characterized in that, The cold storage module includes at least one cold storage heat exchanger; the cold storage heat exchanger includes an LNG / refrigerant inlet, an LNG / refrigerant outlet, refrigerant channel I, refrigerant channel II, LNG channel I, LNG channel II, cold storage working fluid, and a snowflake-shaped fin structure; the snowflake-shaped fin structure fins extend diagonally outwards in all directions, extending one level to form three branches, i.e., the number of branches M=3, with the fin ends of each level distributed on the same straight line, and the initial length of each level being the same value, i.e., satisfying the formula: L0=L1=L2=……=L n Where L0 is the length of the first-stage rib, L n Let be the length of the nth level rib. Furthermore, the recursive formula for the front and rear widths of each rib level satisfies the following formula: First-level rib width: Width of the nth level rib: Where W0 is the width of the first-level rib; W1 = W3; W 3n-2 =W3 n W2 = 0.8W0; W 3n-1 =0.8W 3n-4 .

6. The LNG-cooled data center cooling device according to claim 5, characterized in that, The cold storage module consists of N cold storage heat exchangers arranged end to end, with the freezing point temperature of the cold storage working fluid increasing along the LNG flow direction.

7. The LNG-cooled data center cooling device according to any one of claims 1-4, characterized in that, The LNG pretreatment module includes an LNG carrier, a Stage I compressor, a recondenser, a Stage II compressor, a high-pressure pump, a low-pressure pump, an LNG storage tank, a flare, a liquid-phase LNG pipeline, and a gaseous-phase LNG pipeline. LNG is transferred from the LNG carrier to the LNG storage tank via the liquid-phase LNG pipeline, and BOG (Boiled Air Gaseous) enters the flare from the LNG carrier via the gaseous-phase LNG pipeline for combustion. The LNG storage tank has one inlet and two outlets, which are connected to the liquid-phase LNG pipeline and the gaseous-phase LNG pipeline, respectively. The liquid-phase LNG pipeline has two branches: one branch returns to the high-pressure pump via the recondenser and enters the heat exchange module and the cold storage module, and the other branch directly enters the heat exchange module and the cold storage module via the high-pressure pump. BOG from the LNG carrier and the LNG storage tank is collected at the inlet of the Stage I compressor, enters the Stage I compressor, and then passes through the recondenser and the Stage II compressor in sequence. At the outlet of the Stage II compressor, it is combined with NG (Gas Generated Air) from the heat dissipation unit and enters the city pipeline network.

8. The LNG-cooled data center cooling device according to claim 7, characterized in that, LNG storage tanks use double-walled metal insulation to store cryogenic liquefied natural gas; recondensers capture BOG (bottleneck gas) from the LNG storage or processing process and recondense and liquefy it.

9. A collaborative control method driven by data center cooling load demand based on any one of the LNG-cooled data center cooling devices described in claims 1-8, characterized in that: This includes a multi-degree-of-freedom, multi-objective temperature control strategy for a pump-driven two-phase loop and an adaptive temperature control method. The multi-degree-of-freedom, multi-objective temperature control strategy refers to adjusting the multi-degree-of-freedom parameters of the pump-driven two-phase flow loop to achieve multi-objective temperature control of the data center server. The multi-degree-of-freedom parameters are circulation flow rate, evaporator inlet subcooling control, and loop pressure level. The multi-objectives of the data center server are temperature level and temperature uniformity. The adaptive temperature control method refers to using an adaptive control method to improve the robustness of the control system in the face of various disturbances and uncertainties, and to achieve precise temperature regulation.

10. The collaborative control method driven by data center cooling load demand according to claim 9, characterized in that: The LNG-cooled data center cooling device's pump-driven two-phase loop multi-degree-of-freedom, multi-objective temperature control strategy includes a high-efficiency heat dissipation control loop and a high-precision temperature control loop. The high-efficiency heat dissipation control loop controls the evaporator inlet subcooling and circulation flow rate to ideal set values, thereby controlling the gas-liquid phase change initiation and boiling intensity within the microchannel to adjust the heat dissipation intensity, ensuring efficient heat dissipation of the evaporator and optimizing the temperature level and uniformity of the data center servers. The high-precision temperature control loop adjusts the loop pressure level by regulating the liquid storage tank temperature control unit, thereby regulating the evaporation temperature, and further regulating the temperature of the two-phase working fluid in the microchannel evaporator, ultimately controlling the temperature level of the data center servers.

Images