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A cooling approach is provided for one or more subsystems of an electronics rack. The cooling approach employs a coolant distribution unit and a thermal dissipation unit. The coolant distribution unit has a first heat exchanger, a first cooling loop and a second cooling loop. The first cooling loop

A cooling approach is provided for one or more subsystems of an electronics rack. The cooling approach employs a coolant distribution unit and a thermal dissipation unit. The coolant distribution unit has a first heat exchanger, a first cooling loop and a second cooling loop. The first cooling loop passes facility coolant through the first heat exchanger, and the second cooling loop provides system coolant to an electronics subsystem, and expels heat in the first heat exchanger from the subsystem to the facility coolant. The thermal dissipation unit is associated with the electronics subsystem and includes a second heat exchanger, the second cooling loop, and a third cooling loop. The second cooling loop provides system coolant to the second heat exchanger, and the third cooling loop circulates conditioned coolant within the electronics subsystem and expels heat in the second heat exchanger from the electronics subsystem to the system coolant.

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1. A cooling system comprising:a coolant distribution unit, the coolant distribution unit comprising a first heat exchanger, a first cooling loop and at least one second cooling loop, the first cooling loop receiving facility coolant and passing at least a portion thereof through the first heat exch

1. A cooling system comprising:a coolant distribution unit, the coolant distribution unit comprising a first heat exchanger, a first cooling loop and at least one second cooling loop, the first cooling loop receiving facility coolant and passing at least a portion thereof through the first heat exchanger, the at least one second cooling loop providing system coolant to at least one electronics subsystem, and expelling heat in the first heat exchanger from the at least one electronics subsystem to the facility coolant in the first cooling loop; andat least one thermal dissipation unit associated with the at least one electronics subsystem, each thermal dissipation unit comprising a second heat exchanger, a second cooling loop of the at least one second cooling loop, and a third cooling loop, the second cooling loop providing system coolant to the second heat exchanger, the third cooling loop circulating conditioned coolant within the at least one electronics subsystem and expelling heat in the second heat exchanger from the at least one electronics subsystem to the system coolant in the second cooling loop.2. The cooling system of claim 1, wherein the conditioned coolant in the third cooling loop and the system coolant in the second cooling loop differ by at least one characteristic, the at least one characteristic comprising at least one of: coolant purity; coolant pressure; coolant flow rate; coolant phase change temperature; and coolant chemistry.3. The cooling system of claim 2, wherein the conditioned coolant in the third cooling loop and the system coolant in the second cooling loop differ by multiple characteristics, the multiple characteristics comprising at least some of: coolant purity; coolant pressure; coolant flow rate; coolant phase change temperature; and coolant chemistry.4. The cooling system of claim 2, wherein the system coolant in the second cooling loop and the facility coolant in the first cooling loop differ by at least one characteristic, the at least one characteristic comprising at least one of: coolant purity; coolant pressure; coolant flow rate; coolant phase change temperature; and coolant chemistry.5. The cooling system of claim 1, wherein the third cooling loop of each thermal dissipation unit comprises an isolated, closed loop fluid path disposed within the at least one electronics subsystem.6. The cooling system of claim 5, wherein each thermal dissipation unit further includes at least one micro-scaled cooling structure and a coolant pump for moving conditioned coolant through the closed loop fluid path of the third cooling loop between the second heat exchanger and the micro-scaled cooling structure.7. The cooling system of claim 6, wherein the micro-scaled cooling structure is coupled to at least one heat generating component of the at least one electronics subsystem for facilitating expelling heat therefrom to the conditioned coolant within the closed loop fluid path of the third cooling loop.8. The cooling system of claim 7, wherein each thermal dissipation unit comprises a field replaceable unit, and wherein the micro-scaled cooling structure mechanically couples to a surface of the heat generating component, the heat generating component comprising an electronic module.9. The cooling system of claim 7, wherein the at least one heat generating component comprises at least one integrated circuit chip, and wherein the conditioned coolant within the third cooling loop directly contacts the at least one integrated circuit chip of the at least one electronics subsystem.10. The cooling system of claim 9, wherein the conditioned coolant comprises a dielectric fluid.11. The cooling system of claim 7, wherein the at least one heat generating component comprises at least one integrated circuit chip, and wherein each thermal dissipation unit further includes a thermally conductive fluid barrier separating the conditioned coolant in the third cooling loop from the at least one integrated circuit chip.12. The cooling system of claim 11, wherein the conditioned coolant comprises purified water.13. A cooled electronics system comprising:at least one electronics rack comprising a plurality of electronics subsystems; anda cooling system comprising:a coolant distribution unit, the coolant distribution unit comprising a first heat exchanger, a first cooling loop and a plurality of second cooling loops, the first cooling loop receiving facility coolant and passing at least a portion thereof through the first heat exchanger, the plurality of second cooling loops providing system coolant to at least some of the plurality of electronics subsystems, and expelling heat in the first heat exchanger from the at least some electronics subsystems to the facility coolant in the first cooling loop; andmultiple thermal dissipation units each associated with a respective one of the at least some electronics subsystems, each thermal dissipation unit comprising a second heat exchanger, a second cooling loop of the plurality of second cooling loops, and a third cooling loop, the second cooling loop providing system coolant to the second heat exchanger, the third cooling loop circulating conditioned coolant within the respective electronics subsystem and expelling heat in the second heat exchanger from the electronics subsystem to the system coolant in the second cooling loop.14. The cooled electronics system of claim 13, wherein the conditioned coolant in the third cooling loop and the system coolant in the second cooling loop of each thermal dissipation unit differ by at least one characteristic, the at least one characteristic comprising at least one of: coolant purity; coolant pressure; coolant flow rate; coolant phase change temperature; and coolant chemistry.15. The cooled electronics system of claim 14, wherein the conditioned coolant in the third cooling loop and the system coolant in the second cooling loop of each thermal dissipation unit differ by multiple characteristics, the multiple characteristics comprising at least some of: coolant purity; coolant pressure; coolant flow rate; coolant phase change temperature; and coolant chemistry.16. The cooled electronics system of claim 14, wherein the system coolant in the plurality of second cooling loops and the facility coolant in the first cooling loop differ by at least one characteristic, the at least one characteristic comprising at least one of: coolant purity; coolant pressure; coolant flow rate; coolant phase change temperature; and coolant chemistry.17. The cooled electronics system of claim 13, wherein the third cooling loop of each thermal dissipation unit comprises an isolated, closed loop fluid path disposed within the respective electronics subsystem.18. The cooled electronics system of claim 17, wherein each thermal dissipation unit further includes at least one micro-scaled cooling structure and a coolant pump for moving conditioned coolant through the closed loop fluid path of the third cooling loop between the second heat exchanger and the micro-scaled cooling structure, wherein the micro-scaled cooling structure is coupled to at least one heat generating component of the respective electronics subsystem for facilitating expelling heat therefrom to the conditioned coolant within the closed loop fluid path of the third cooling loop.19. The cooled electronics system of claim 18, wherein the at least one micro-scaled cooling structure mechanically couples to a surface of the heat generating component, and wherein the heat generating component comprises an electronic module.20. The cooled electronics system of claim 18, wherein the at least one heat generating component comprises at least one integrated circuit chip, and wherein the conditioned coolant within the third cooling loop directly contacts the at least one integrated circuit chip of the at least one electronics subsystem.21. The cooled electronics system of claim 18, wherein the at least one heat generating component comprises at least one integrated circuit chip, and wherein each thermal dissipation unit further includes a thermally conductive fluid barrier separating the conditioned coolant in the third cooling loop from the at least one integrated circuit chip.22. A method of cooling at least one electronics subsystem, the method comprising:providing a coolant distribution unit, the coolant distribution unit comprising a first heat exchanger, a first cooling loop and at least one second cooling loop, the first cooling loop receiving facility coolant and passing at least a portion thereof through the first heat exchanger, the at least one second cooling loop providing system coolant to at least one electronics subsystem, and expelling heat in the first heat exchanger from the at least one electronics subsystem to the facility coolant in the first cooling loop; andproviding at least one thermal dissipation unit associated with the at least one electronics subsystem, each thermal dissipation unit comprising a second heat exchanger, a second cooling loop of the at least one second cooling loop, and a third cooling loop, the second cooling loop providing system coolant to the second heat exchanger, the third cooling loop circulating conditioned coolant within the at least one electronics subsystem and expelling heat in the second heat exchanger from the at least one electronics subsystem to the system coolant in the second cooling loop.23. The method of claim 22, wherein the conditioned coolant in the third cooling loop and the system coolant in the second cooling loop differ by at least one characteristic, the at least one characteristic comprising at least one of: coolant purity; coolant pressure; coolant flow rate; coolant phase change temperature; and coolant chemistry.24. The method of claim 23, wherein the system coolant in the second cooling loop and the facility coolant in the first cooling loop differ by at least one characteristic, the at least one characteristic comprising at least one of: coolant purity; coolant pressure; coolant flow rate; coolant phase change temperature; and coolant chemistry.25. The method of claim 22, wherein the providing at least one thermal dissipation unit includes providing each thermal dissipation unit with a micro-scaled cooling structure and a coolant pump for moving conditioned coolant through the third cooling loop, wherein the third cooling loop comprises an isolated, closed loop fluid path between the second heat exchanger and the micro-scaled cooling structure, and wherein the method further comprises coupling the micro-scaled cooling structure to at least one heat generating component of the at least one electronics subsystem for facilitating expelling heat therefrom to the conditioned coolant within the closed loop fluid path of the third cooling loop.26. The method of claim 25, wherein the providing at least one thermal dissipation unit further comprises filtering the conditioned coolant within the third cooling loop, and wherein the filtering comprises temporarily coupling a filter in fluid communication with the third cooling loop employing at least one of multiple three-way valves in fluid communication with the third cooling loop or multiple compression couplings integrated within the third cooling loop.