Data center with an immersion electronic rack and a two-phase coolant unit

Abstract

An information technology (IT) equipment cooling system includes being connected to an electronic rack coolant unit, and the coolant unit supplies a two-phase liquid coolant to one or more IT equipment cooling units installed within the electronic rack. Each of the one or more IT equipment cooling units includes an IT unit having one or more IT devices, and the IT devices are configured to provide IT services and are at least partially immersed in the two-phase liquid coolant. Wherein, when the IT devices provide IT services, the heat generated by the IT devices is transferred to the two-phase liquid coolant, thereby causing at least some of the two-phase liquid coolant to turn into a gas phase. The IT equipment cooling unit includes an IT condensation unit having a condenser located above the IT unit, and the condenser is configured to condense the vapor back into the liquid phase.

Description

Technical Field

[0001] Embodiments of the present invention generally relate to data centers and server cooling. More specifically, embodiments of the present invention relate to data centers having immersion electronic racks and two-phase coolant units. Background Art

[0002] Heat management for a data center including several operating electronic racks is crucial for ensuring the proper performance of servers and other information technology (IT) equipment operating in the racks (e.g., performing IT services). However, in the absence of proper heat management, the thermal environment (e.g., temperature) within the racks may exceed the thermal operation threshold, which may lead to adverse consequences (e.g., server failure, etc.). One way to manage the thermal environment is to use cooling air to cool the IT equipment. The cooling air is recycled through a cooling unit. The heat generated by the IT equipment is captured by the cooling air and extracted by the cooling unit. A common cooling unit is a computer room air conditioner (CRAC) unit, which is a device that draws in hot exhaust return air and provides cooling air to maintain the thermal environment of the data center.

[0003] Recently, data centers have been configured with higher power density electronic racks, where higher density chips are more closely packaged together to provide stronger processing capabilities. Cooling these high-density racks by maintaining an appropriate thermal environment using existing cooling systems such as CRAC (computer room air conditioner) units can be problematic. For example, although a CRAC unit can maintain the thermal environment of relatively conventional (or lower density) racks, the unit may not be able to effectively cool high power density racks because they may generate heat loads at a higher rate due to the higher density of electronic devices. In addition, significant costs may be required to upgrade the CRAC system to meet the cooling requirements of high-density configurations. Another challenge in air-cooling high-density racks is moving a large volume of airflow sufficient to cool the racks.

[0004] On the other hand, immersion cooling, where electronic devices are at least partially immersed in a dielectric solution, is a viable solution for high-density electronic devices. However, implementing immersion cooling in existing data centers is challenging. For example, since existing data centers are designed to be suitable for air cooling or other types of liquid cooling, the cooling infrastructure of the data center may need to be modified to be able to support the operation of an immersion cooling system. In addition, immersion cooling is a more complex cooling method than existing air / liquid solutions.

[0005] Existing solutions for immersion systems include configuring a dielectric solution in a single tank. As previously mentioned, the disadvantage of the single-tank solution is the potential loss of the dielectric solution, and the configuration of the servers and / or electronic racks is very complex. SUMMARY OF THE INVENTION

[0006] Some aspects of the present application provide an information technology equipment cooling system, which may include a coolant unit coupled to an electronic rack. In one embodiment, the coolant unit supplies a two-phase liquid coolant to a two-phase coolant manifold of the electronic rack, and the two-phase coolant manifold supplies the two-phase liquid coolant to one or more information technology equipment cooling units to be installed within the electronic rack. In one embodiment, each of the one or more information technology equipment cooling units may include: an information technology unit having one or more information technology devices configured to provide information technology services and at least partially immersed in the two-phase liquid coolant, wherein when the information technology devices provide information technology services, the heat generated by the information technology devices is transferred to the two-phase liquid coolant, causing at least some of the two-phase liquid coolant to turn into a gas phase; and an information technology condensation unit having a condenser located above the information technology unit, the condenser being configured to condense the vapor back into a liquid phase.

[0007] Some aspects of the present application provide a data center system, which may include: a central coolant system; a plurality of information technology equipment cooling systems; and distribution pipelines for distributing the two-phase coolant from the central coolant system to the plurality of information technology equipment cooling systems. In one embodiment, each of the plurality of information technology equipment cooling systems may include a coolant unit coupled to an electronic rack. In one embodiment, the coolant unit supplies a two-phase liquid coolant to a two-phase coolant manifold of the electronic rack, and the two-phase coolant manifold supplies the two-phase liquid coolant to one or more information technology equipment cooling units to be installed within the electronic rack. In one embodiment, each of the one or more information technology equipment cooling units may include: an information technology unit having one or more information technology devices configured to provide information technology services and at least partially immersed in the two-phase liquid coolant, wherein when the information technology devices provide information technology services, the heat generated by the information technology devices is transferred to the two-phase liquid coolant, causing at least some of the two-phase liquid coolant to turn into a gas phase; and an information technology condensation unit having a condenser located above the information technology unit, the condenser being configured to condense the vapor back into a liquid phase. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Embodiments of the present invention are illustrated by way of example and not limitation in the accompanying drawings, in which like reference numerals represent like elements.

[0009] Figure 1 is a block diagram showing an example of two modular information technology (IT) equipment cooling systems according to one embodiment.

[0010] Figure 2 is a block diagram showing a front view and a side view of a modular IT device cooling system according to one embodiment.

[0011] Figure 3 is a block diagram showing the liquid management of a coolant unit of a modular IT device cooling system according to one embodiment.

[0012] Figure 4 is a plan view of a block diagram showing a cluster of a modular IT device cooling system having a central coolant system according to one embodiment.

[0013] Figure 5 is a block diagram showing a first configuration scenario according to one embodiment.

[0014] Figure 6 is a block diagram showing a second configuration scenario according to one embodiment. Detailed Description

[0015] Various embodiments and aspects of the present invention will be described in detail with reference to the details discussed below, and the drawings will illustrate the various embodiments. The following description and the drawings are illustrative of the present invention and do not constitute a limitation on the present invention. Many specific details are described to provide a thorough understanding of the various embodiments of the present invention. However, in certain instances, well-known or conventional details are not described in order to provide a concise discussion of the embodiments of the present invention.

[0016] Reference to "one embodiment" or "an embodiment" in the specification means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The phrase "in one embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment.

[0017] Aspects of the present disclosure relate to servers, electronic rack immersion designs, and / or co-designs of electronic racks and immersion systems to improve the efficiency of configurations in data centers while significantly reducing the potential loss of dielectric solution associated with single-box solutions.

[0018] According to a first aspect, an information technology (IT) equipment cooling system includes a coolant unit to be coupled to an electronic rack, a coolant unit that supplies a two-phase liquid coolant to a two-phase coolant manifold of the electronic rack, and a two-phase coolant manifold that supplies the two-phase liquid coolant to one or more IT equipment cooling units to be installed within the electronic rack. Each of the one or more IT equipment cooling units includes an IT unit having one or more IT devices, the IT devices being configured to provide IT services and at least partially immersed in the two-phase liquid coolant, wherein when the IT devices provide IT services, heat generated by the IT devices is transferred to the two-phase liquid coolant, causing at least some of the two-phase liquid coolant to turn into a gas phase. The IT equipment cooling unit includes an IT condensation unit having a condenser located above the IT unit, and the condenser is configured to condense the vapor back into the liquid phase.

[0019] In one embodiment, the coolant unit includes a container within the coolant unit for storing the two-phase coolant. In one embodiment, the coolant unit includes a supply pump for pumping the two-phase coolant to one or more IT equipment cooling units housed within the electronic rack, and a discharge pump for discharging the two-phase coolant from one or more IT equipment cooling units within the electronic rack. In one embodiment, the coolant unit is manufactured as part of the electronic rack, wherein the coolant unit is located below the electronic rack.

[0020] In one embodiment, the electronic rack includes a first inlet port coupled to the supply pump of the coolant unit and a first outlet port coupled to the discharge pump of the coolant unit, wherein the first inlet port and the first outlet port are respectively used to charge or discharge the two-phase coolant to or from the electronic rack. In one embodiment, the electronic rack includes a second inlet port and a second outlet port, wherein the second inlet port and the second outlet port are used to circulate a single-phase liquid to the condenser of the IT equipment cooling unit.

[0021] In one embodiment, each IT unit includes a liquid level sensor for sensing the liquid level of the two-phase coolant within the IT unit, and a valve between the two-phase coolant manifold of the electronic rack and the IT unit, wherein the liquid level is used to control the supply pump and the valve of the coolant unit, wherein if the valve is not opened, the two-phase coolant will not be charged into the IT unit. In one embodiment, the coolant unit includes a first three-way valve having a first port coupled to the supply pump, a second port coupled to the manifold of the electronic rack, and a third port coupled to a central coolant system. The coolant unit includes a second three-way valve having a fourth port coupled to the discharge pump, a fifth port coupled to the manifold of the electronic rack, and a sixth port coupled to the central coolant system.

[0022] In one embodiment, the first three-way valve operates to open the first port and the second port to pump the two-phase coolant from the coolant unit to the electronic rack. The first three-way valve operates to open the first port and the third port to pump the two-phase coolant from the coolant unit to the central coolant system. In one embodiment, the second three-way valve operates to open the fourth port and the fifth port to pump the two-phase coolant from the electronic rack to the coolant unit. The second three-way valve operates to open the fourth port and the sixth port to pump the two-phase coolant from the central coolant system to the coolant unit.

[0023] According to a second aspect, a data center system includes a central coolant system, a plurality of information technology (IT) equipment cooling systems, and distribution pipelines for distributing the two-phase coolant from the central coolant system to the IT equipment cooling systems. Each of the IT equipment cooling systems includes a coolant unit to be connected to an electronic rack, a coolant unit that supplies a two-phase liquid coolant to a two-phase coolant manifold of the electronic rack, and a two-phase coolant manifold that supplies the two-phase liquid coolant to one or more IT equipment cooling units to be installed within the electronic rack. Each of the one or more IT equipment cooling units includes an IT unit having one or more IT equipment, the IT equipment configured to provide IT services and at least partially immersed in the two-phase liquid coolant. When the IT equipment provides IT services, the heat generated by the IT equipment is transferred to the two-phase liquid coolant, causing at least some of the two-phase liquid coolant to turn into a gas phase. The IT equipment cooling unit includes an IT condensation unit having a condenser located above the IT unit, and the condenser is configured to condense the vapor back into the liquid phase.

[0024] Figure 1 is a block diagram showing an example of a modular information technology (IT) equipment cooling system architecture 100 according to one embodiment. The system architecture 100 shows two separate modules 101A - 101B.

[0025] Each of modules 101A - 101B includes an electronic rack 103A - 103B and a two - phase coolant unit 105A - 105B adjacent to the electronic rack 103A - 103B. In one embodiment, the two - phase coolant units 105A - 105B are below the electronic racks 103A - 103B. Each coolant unit 105A - 105B includes a corresponding container 111A - 111B for storing the two - phase coolant, where the coolant units 105A - 105B manage the flow of the two - phase coolant between the respective electronic racks 103A - 103B and the containers 111A - 111B. The coolant units 105A - 105B include supply pumps 107A - 107B and discharge pumps 109A - 109B. The supply pumps 107A - 107B are used to pump the two - phase coolant to the electronic racks 103A - 103B, while the discharge pumps 109A - 109B are used to discharge the two - phase coolant from the electronic racks 103A - 103B.

[0026] Each electronic rack 103A - 103B may be equipped with one or more cooling units 113. Each of the cooling units 113A - 113B may respectively include an IT condensation unit 115A - 115B and an IT unit 117A - 117B. The IT condensation units 115A - 115B may be placed on top of the respective IT units 117A - 117B, where the IT condensation units 115A - 115B may be connected to a liquid cooling source via a liquid cooling loop. In one embodiment, the IT condensation unit 115 is connected to the liquid cooling source via a recirculation pump 119. In one embodiment, the cooling liquid circulated from the liquid cooling source is different from the two - phase liquid coolant. Although only two modules are shown, the system architecture 100 may include any number of modules.

[0027] As Figure 2 Furthermore, ports and connectors can be used to connect the liquid cooling source to the IT condensation unit and to connect the coolant unit to the corresponding IT unit.

[0028] Figure 2 is a block diagram showing a front view and a side view of a modular IT device cooling system 101A according to one embodiment. Figure 2Shows two separate liquid circulation systems for the cooling system 101A. The first liquid circulation system supplies and returns cooling liquid to the IT condensation units 115A-1, 115A-2 using the cooling liquid manifolds 201A and 202A respectively. The second liquid system supplies two-phase coolant to the IT units 117A-1, 117A-2 and returns two-phase coolant from the IT units 117A-1, 117A-2 using the coolant supply manifold 203A and the coolant return manifold 204A respectively. The two-phase coolant can be a cooling dielectric solution, in which the IT electronic devices included in the IT units are at least partially immersed.

[0029] Reference Figure 2 , in one embodiment, the cooling system 101A includes a controller 215 for controlling the supply / return of the two-phase coolant to the separate IT units 117A-1, 117A-2 via the coolant unit 105A. It can be seen that each separate IT unit 117A-1, 117A-2 includes a corresponding liquid level sensor 209A-1, 209A-2, where each liquid level sensor 209A-1, 209A-2 can be used to activate the supply pump 107A and / or the corresponding control valves 212A-1, 212A-2. In one embodiment, the control valves 212A-1, 212A-2 are located within the corresponding IT units 117A-1, 117A-2. When the IT units 117A-1, 117A-2 are filled with the liquid phase of the two-phase coolant, the supply pump 107A and the corresponding valves 212A-1, 212A-2 can be activated to supply the two-phase coolant to the corresponding IT units. In one embodiment, the controller 215 receives signals from the liquid level sensors 209A-1, 209A-2 to activate the supply pump 107A and the corresponding valves 212A-1, 212A-2 according to a pre-configured liquid level.

[0030] When the supply pump 107A pumps the two-phase coolant to the separate IT units 117A-1, 117A-2 and if the corresponding valves 212A-1, 212A-2 are not opened, the coolant will not fill into the corresponding IT units 117A-1, 117A-2. Since the supply pump 107A is used for multiple IT units 117A-1, 117A-2, each separate IT unit 117A-1, 117A-2 requires a separate control valve 212A-1, 212A-2. This means that the separate IT units 117A-1, 117A-2 can be filled independently.

[0031] In one embodiment, the IT units 117A-1, 117A-2 include respective control valves 211A-1, 211A-2 to discharge the two-phase coolant. In this case, the controller 215 may receive a command signal from a facility operator to activate one or more of the control valves 211A-1, 211A-2 and the discharge pump 109A to discharge the two-phase coolant of one or more of the IT units 117A-1, 117A-2 for repair and / or maintenance purposes.

[0032] In one embodiment, the control valves 212A-1, 212A-2 are coupled to one or more supply ports 207A-1, 207A-2 of the IT units 117A-1, 117A-2, wherein the coolant supply manifold 203A of the electronic rack 103A is connected to the one or more supply ports 207A-1, 207A-2.

[0033] In one embodiment, the control valves 211A-1, 211A-2 are coupled to one or more return ports 208A-1, 208A-2 of the IT units 117A-1, 117A-2, wherein the coolant return manifold 204A of the electronic rack 103A is connected to the one or more return ports 208A-1, 208A-2.

[0034] In this case, the supply pump 107A may pump the two-phase coolant to the IT units 117A-1, 117A-2 via connectors connected to the ports 207A-1, 207A-2, wherein the two-phase coolant pumped to the IT units 117A-1, 117A-2 may be used to at least partially submerge the IT electronic devices within the IT units 117A-1, 117A-2. When contacting the heat generated by the IT electronic devices, the two-phase coolant evaporates from the liquid state to the gaseous state, thereby absorbing heat from the IT electronic devices. The two-phase coolant in the gaseous state carries the heat and rises to the respective IT condensing units 115A-1, 115A-2, wherein the two-phase coolant in the gaseous state is condensed back to the liquid state by a condensing coil (not shown). The coolant return manifold 204A receives the condensed coolant via the ports 210A-1, 210A-2, wherein the condensed liquid-phase coolant may be discharged to the coolant unit 105A.

[0035] For the coolant circulation system, the liquid supply manifold 201A is connected to one or more supply ports 205A-1, 205A-2 of the IT condensation units 115A-1, 115A-2. The liquid return manifold 202A is connected to one or more return ports 206A-1, 206A-2 of the IT condensation units 115A-1, 115A-2. The coolant can be supplied to the ports 205A-1, 205A-2 via the recirculation pump 119A, where the coolant circulates through the condensation coils within the IT condensation units 115A-1, 115A-2. From the IT condensation units 115A-1, 115A-2, the coolant carries the heat extracted from the condensation coils and leaves the IT condensation units 115A-1, 115A-2 via the return ports 206A-1, 206A-2.

[0036] Figure 3 is a block diagram showing the liquid management of the coolant unit 105A according to one embodiment. In one embodiment, the coolant unit 105A includes three-way valves 301A, 303A at the liquid lines of the respective pumps 107A and 109A. The three-way valves 301A, 303A can be used to control the functions of the pumps 107A and 109A.

[0037] For example, the supply pump 107A can be used to pump the coolant from the coolant unit 105A to the electronic rack 103A, or to pump the coolant from the coolant unit 105A to the central coolant system (outlet) at the data center facility. The discharge pump 109A can be used to pump the coolant from the electronic rack 103A to the coolant unit 105A, or to pump the coolant from the central coolant system (inlet) to the coolant unit 105A. The states of the respective valves are shown below.

[0038] In one embodiment, for the valve 301A, if port 1-2 is open, the supply pump 107A operates to pump the coolant from the coolant unit 105A to the electronic rack 103A. If port 1-3 of the valve 301A is open, the supply pump 107A operates to pump the coolant from the coolant unit 105A to the central coolant system (outlet).

[0039] In one embodiment, for the valve 303A, if port 4-5 is open, the discharge pump 109A operates to pump the coolant from one or more IT units on the electronic rack 103A to the coolant unit 105A. If port 4-6 of the valve 303A is open, the discharge pump 109A operates to pump the coolant from the central coolant system (inlet) to the coolant unit 105A. Although three-way valves are shown in this embodiment, different combinations of two-way valves can also be used instead of the three-way valves.

[0040] Figure 4is a plan view showing a block diagram of a data center 400 having a modular IT equipment cooling system cluster according to one embodiment. As Figure 4 shown, the data center 400 includes eight modules, each module including electronic racks 103A - 103H, and coolant units 105A - 105H adjacent to the corresponding electronic racks 103A - 103H. The coolant units 105A - 105H are connected to a central coolant system 401 via a distribution loop 403. The central coolant system 401 may be coupled to the distribution loop 403 through an inlet port / output port (not shown) at the central coolant system 401. In this case, the central coolant system 401 may store the two-phase coolant to be distributed to the coolant units 105A - 105H, or the coolant units 105A - 105H may discharge the coolant to the central coolant system 401 for storage.

[0041] Although the electronic racks 103A - 103H are shown arranged adjacent to the corresponding coolant units 105A - 105H, other arrangements such as a staggered arrangement may also be used.

[0042] Figure 5 is a block diagram showing a first configuration scenario 500 according to one embodiment. As shown, the electronic rack 103A and the coolant unit 105A may be configured as a group. For example, the electronic rack 103A and the coolant unit 105A are configured together. Pumps 107A, 109A are the corresponding supply pump 107A and discharge pump 109A of the coolant unit 105A.

[0043] Figure 6 is a block diagram showing a second configuration scenario 600 according to one embodiment. Figure 6 Another design is shown, in which the coolant units 105A - 105H and the corresponding electronic racks are configured and used separately. First, the coolant units 105A - 105H are configured and used at the data center equipment by connecting the coolant units 105A - 105H to the central coolant system 401 and filling the coolant units 105A - 105H with the two-phase coolant. Then, the electronic racks may be configured and used separately.

[0044] In two configuration scenarios 500, 600, a two-phase coolant is filled in the central coolant units 105A - 105H. Each individual coolant unit 105A - 105H can pump the coolant from the central coolant system 401 into their internal containers. Then, the coolant units 105A - 105H can pump the coolant from their internal containers to the IT units of the electronic racks to immerse the IT electronic devices in the coolant. In the maintenance mode, by operating one or more control valves and supply / discharge pumps at the coolant units, the coolant can be discharged from the IT units to the coolant units 105A - 105H, and from the coolant units 105A - 105H to the central coolant system 401.

[0045] In the foregoing specification, embodiments of the invention have been described with reference to specific exemplary embodiments of the invention. Obviously, various modifications can be made thereto without departing from the broader spirit and scope of the invention as set forth in the appended claims. Accordingly, the specification and drawings are illustrative rather than restrictive.

Claims

1. Information technology equipment cooling system, comprising: A coolant unit connected to an electronic rack, the coolant unit supplying a two-phase liquid coolant to a two-phase coolant manifold of the electronic rack, and the two-phase coolant manifold supplying the two-phase liquid coolant to one or more information technology equipment cooling units to be installed within the electronic rack, wherein each of the one or more information technology equipment cooling units includes: An information technology unit having one or more information technology devices configured to provide information technology services and at least partially immersed in the two-phase liquid coolant, wherein when the information technology devices provide the information technology services, heat generated by the information technology devices is transferred to the two-phase liquid coolant, causing at least some of the two-phase liquid coolant to turn into a gas phase; and An information technology condensation unit having a condenser located above the information technology unit, the condenser configured to condense the vapor back into the liquid phase; Wherein the coolant unit includes: A supply pump for pumping the two-phase liquid coolant to the one or more information technology equipment cooling units housed within the electronic rack; A discharge pump for discharging the two-phase liquid coolant from the one or more information technology equipment cooling units within the electronic rack; A first three-way valve having a first port connected to the supply pump, a second port connected to the two-phase coolant manifold of the electronic rack, and a third port connected to a central coolant system; and A second three-way valve having a fourth port connected to the discharge pump, a fifth port connected to the two-phase coolant manifold of the electronic rack, and a sixth port connected to the central coolant system.

2. The information technology device cooling system according to claim 1, wherein, The coolant unit includes a container within the coolant unit for storing the two-phase liquid coolant.

3. The information technology equipment cooling system according to claim 1, wherein, The electronic rack includes: A first inlet port connected to the supply pump of the coolant unit; and A first outlet port connected to the discharge pump of the coolant unit, wherein the first inlet port and the first outlet port respectively fill or discharge the two-phase liquid coolant to or from the electronic rack.

4. The information technology equipment cooling system according to claim 1, wherein, The electronic rack includes a second inlet port and a second outlet port, wherein the second inlet port and the second outlet port circulate a single-phase liquid to the condenser of the information technology equipment cooling unit.

5. The information technology device cooling system according to claim 3, wherein, Each information technology unit includes: A liquid level sensor for sensing the liquid level of the two-phase liquid coolant within the information technology unit; and A valve located between the information technology unit and the two-phase coolant manifold of the electronic rack, wherein the liquid level is used to control the supply pump and the valve of the coolant unit, wherein if the valve is not opened, the two-phase liquid coolant will not be charged into the information technology unit.

6. The information technology equipment cooling system according to claim 3, wherein The first three-way valve operates to open the first port and the second port, thereby pumping the two-phase liquid coolant from the coolant unit to the electronic rack. Wherein, the first three-way valve operates to open the first port and the third port, thereby pumping the two-phase liquid coolant from the coolant unit to the central coolant system.

7. The information technology device cooling system according to claim 3, wherein, The second three-way valve operates to open the fourth port and the fifth port, thereby pumping the two-phase liquid coolant from the electronic rack to the coolant unit. Wherein, the second three-way valve operates to open the fourth port and the sixth port, thereby pumping the two-phase liquid coolant from the central coolant system to the coolant unit.

8. The information technology equipment cooling system according to claim 1, wherein The coolant unit is manufactured as part of the electronic rack, and the coolant unit is located below the electronic rack.

9. A data center system, comprising: A central coolant system; A plurality of information technology equipment cooling systems; And Distribution pipelines for distributing the two-phase liquid coolant from the central coolant system to the plurality of information technology equipment cooling systems, wherein each of the plurality of information technology equipment cooling systems includes: A coolant unit connected to an electronic rack, the coolant unit supplying the two-phase liquid coolant to a two-phase coolant manifold of the electronic rack, and The two-phase coolant manifold supplies the two-phase liquid coolant to one or more information technology equipment cooling units to be installed in the electronic rack, wherein, Each of the one or more information technology equipment cooling units includes: An information technology unit having one or more information technology devices, the information technology devices configured to provide information technology services and at least partially immersed in the two-phase liquid coolant. When the information technology devices provide the information technology services, the heat generated by the information technology devices is transferred to the two-phase liquid coolant, thereby causing at least some of the two-phase liquid coolant to turn into a gas phase; and An information technology condensation unit having a condenser located above the information technology unit, the condenser configured to condense the vapor back into a liquid phase. Wherein, the coolant unit includes: A supply pump for pumping the two-phase liquid coolant to the one or more information technology equipment cooling units housed in the electronic rack; A discharge pump for discharging the two-phase liquid coolant from the one or more information technology equipment cooling units in the electronic rack; A first three-way valve having a first port connected to the supply pump, a second port connected to the two-phase coolant manifold of the electronic rack, and a third port connected to the central coolant system; and A second three-way valve having a fourth port connected to the discharge pump, a fifth port connected to the two-phase coolant manifold of the electronic rack, and a sixth port connected to the central coolant system.

10. The data center system according to claim 9, wherein, The coolant unit of the information technology equipment cooling unit is attachable or detachable from the electronic rack of the information technology equipment cooling unit.

11. The data center system according to claim 10, wherein, The coolant unit includes a container within the coolant unit for storing the two-phase liquid coolant.

12. The data center system according to claim 10, wherein, The electronic rack includes: a first inlet port coupled to the supply pump of the coolant unit; and a first outlet port coupled to the discharge pump of the coolant unit, wherein the first inlet port and the first outlet port respectively fill or discharge the two-phase liquid coolant to or from the electronic rack.

13. The data center system according to claim 10, wherein The electronic rack includes a second inlet port and a second outlet port, wherein the second inlet port and the second outlet port circulate a single-phase liquid to a condenser of the information technology equipment cooling unit.

14. The data center system according to claim 12, wherein, Each information technology unit includes: a liquid level sensor for sensing the liquid level of the two-phase liquid coolant within the information technology unit; and a valve located between the information technology unit and the two-phase coolant manifold of the electronic rack, wherein the liquid level is used to control the supply pump and the valve of the coolant unit, wherein if the valve is not opened, the two-phase liquid coolant will not be charged into the information technology unit.

15. The data center system according to claim 12, wherein, The first three-way valve operates to open the first port and the second port to pump the two-phase liquid coolant from the coolant unit to the electronic rack, wherein the first three-way valve operates to open the first port and the third port to pump the two-phase liquid coolant from the coolant unit to the central coolant system.

16. The data center system according to claim 12, wherein, The second three-way valve operates to open the fourth port and the fifth port to pump the two-phase liquid coolant from the electronic rack to the coolant unit, wherein the second three-way valve operates to open the fourth port and the sixth port to pump the two-phase liquid coolant from the central coolant system to the coolant unit.

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