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A system for cooling a computer data center includes a computer data center building; a plurality of computer racks arranged in a plurality of linear rows inside the computer data center building, with particular ones of the racks housing a plurality of computer systems; a plurality of cooling fluid

A system for cooling a computer data center includes a computer data center building; a plurality of computer racks arranged in a plurality of linear rows inside the computer data center building, with particular ones of the racks housing a plurality of computer systems; a plurality of cooling fluid conduits; and a plurality of cooling plants arranged outside the computer data center building along an exterior wall of the computer data center building. At least one of the cooling plants corresponds to one or more particular ones of the cooling fluid conduits and provides cooling for the corresponding conduit.

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1. A system for cooling a computer data center, comprising: a computer data center building;a plurality of computer racks arranged in a plurality of linear rows inside the computer data center building, the linear rows of computer racks arranged in paired parallel rows of racks that are fluidly atta

1. A system for cooling a computer data center, comprising: a computer data center building;a plurality of computer racks arranged in a plurality of linear rows inside the computer data center building, the linear rows of computer racks arranged in paired parallel rows of racks that are fluidly attached to respective common warm-air capture plenums positioned between the paired parallel rows of racks, with particular ones of the racks housing a plurality of computer systems;a plurality of cooling fluid conduits; anda plurality of cooling plants arranged outside the computer data center building along an exterior wall of the computer data center building, each of the cooling plants corresponding to one or more particular ones of the cooling fluid conduits and providing cooling for the corresponding conduit. 2. The system of claim 1, wherein particular ones of the cooling fluid conduits are arranged in parallel with corresponding ones of the linear rows of computer racks. 3. The system of claim 1, wherein the paired parallel rows of racks have front sides pointed away from the warm-air capture plenums that are open to receive cool air from a workspace in the data center building. 4. The system of claim 1, further comprising air circulation fans arranged to circulate warmed air upward and out of the warm-air capture plenums. 5. The system of claim 4, wherein cooled air is supplied to a workspace of the data center building from above the racks. 6. The system of claim 1, wherein the cooling fluid conduits comprise cooling water pipes. 7. The system of claim 6, wherein the cooling water pipes define cooling water loops that each include a cooling water supply pipe and a cooling water return pipe that is parallel to the cooling water supply pipe. 8. The system of claim 1, wherein the cooling fluid conduits include taps spaced along their lengths to provide cooling fluid along lengths of the rows of racks. 9. The system of claim 1, wherein each cooling plant outside the data center building corresponds to an integer number of rows of racks inside the data center building. 10. The system of claim 9, wherein each cooling plant outside the data center building corresponds to one paired row of racks inside the data center building. 11. The system of claim 1, wherein the plurality of cooling fluid conduits are connected to a common header, and the cooling plants are connected to the common header, so as to provide cooling fluid diversity between the cooling plants and the data center. 12. The system of claim 1, wherein the cooling plants are adapted to operate in a closed-water cooling mode and an open-water cooling mode. 13. The system of claim 1, wherein the cooling plants are modular cooling plants. 14. The system of claim 1, wherein the cooling plants are adapted to operate without chillers, and to operate with chillers for cooling when conditions exceed an ability of non-chiller cooling to cool the data center building. 15. The system of claim 1, wherein the cooling fluid conduits are located above the racks. 16. The system of claim 1, wherein particular ones of the cooling plants correspond to open spaces in the data center building where computer racks have not yet been installed. 17. The system of claim 16, further comprising an isolation curtain positioned and arranged to separate the open spaces in the data center building from spaces where racks have been installed and are operating. 18. The system of claim 1, wherein the cooling plants include one or more fluid-to-fluid heat exchangers. 19. The system of claim 18, wherein the fluid-to-fluid heat exchangers include one or more water-to-water heat exchangers. 20. A method for cooling a computer data center, comprising: arranging a plurality of linear rows of computer racks in paired parallel rows of racks that are fluidly attached to respective common warm-air capture plenums that are positioned between the paired parallel rows of racks;operating computers in the computer racks inside a data center building, with particular ones of the racks housing a plurality of computer systems;operating a plurality of cooling plants outside the data center building along an exterior wall of the data center building, each of the cooling plants corresponding to one or more particular ones of the rows of racks; andcirculating cooling fluid through a plurality of cooling fluid conduits that correspond to particular ones of the rows of racks and that are served by particular ones of the cooling plants. 21. The method of claim 20, wherein particular ones of the cooling fluid conduits are arranged in parallel with corresponding ones of the linear rows of computer racks. 22. The method of claim 20, further comprising circulating cool supply air from a workspace in the data center building through open fronts of the paired parallel rows of racks, the fronts facing away from the warm-air capture plenums. 23. The method of claim 20, further comprising circulating warmed air upward and out of the warm-air capture plenums. 24. The method of claim 23, further comprising supplying, from above the racks, cool air to a human-occupiable workspace of the data center building adjacent fronts of the racks. 25. The method of claim 20, wherein the cooling fluid conduits comprise cooling water pipes. 26. The method of claim 25, wherein the cooling water pipes define cooling water loops that each include a cooling water supply pipe and a cooling water return pipe that is parallel to the cooling water supply pipe. 27. The method of claim 20, further comprising supplying cooling fluid along lengths of the cooling fluid conduits via taps in the sides of the cooling fluid conduits. 28. The method of claim 20, further comprising circulating cooling water from the cooling plants into a common header from which the cooling fluid conduits draw cooling fluid, so as to provide cooling diversity between the cooling plants and the data center. 29. The method of claim 20, further comprising operating the cooling plants in a closed-water cooling mode and then in an open-water cooling mode. 30. The method of claim 20, wherein the cooling plants are modular cooling plants. 31. The method of claim 20, further comprising: operating the cooling plants in a chillerless mode;determining that conditions exceed an ability of the cooling plants operating in the chillerless mode to cool the data center building; andbased on the determination, operating the cooling plants with at least one chiller providing a chilled fluid to remove heat generated by at least a portion of the computer systems. 32. A system for cooling a computer data center, comprising: a computer data center building;a plurality of computer racks arranged in a plurality of linear rows inside the computer data center building, with particular ones of the racks housing a plurality of computer systems;a plurality of cooling fluid conduits comprising cooling water pipes; anda plurality of cooling plants arranged outside the computer data center building along an exterior wall of the computer data center building, each of the cooling plants corresponding to one or more particular ones of the cooling fluid conduits and providing cooling for the corresponding conduit. 33. The system of claim 32, wherein the plurality of cooling fluid conduits are connected to a common header, and the cooling plants are connected to the common header, so as to provide cooling fluid diversity between the cooling plants and the data center. 34. The system of claim 32, wherein the cooling plants are adapted to operate in a closed-water cooling mode and an open-water cooling mode. 35. The system of claim 32, the cooling plants are adapted to operate without chillers, and to operate with chillers for cooling when conditions exceed an ability of non-chiller cooling to cool the data center building. 36. The system of claim 32, wherein particular ones of the cooling plants corresponding to open spaces in the data center building where computer racks have not yet been installed, the system further comprising an isolation curtain positioned and arranged to separate the open spaces in the data center building from spaces where racks have been installed and are operating. 37. A system for cooling a computer data center, comprising: a computer data center building;a plurality of computer racks arranged in a plurality of linear rows inside the computer data center building, with particular ones of the racks housing a plurality of computer systems;a plurality of cooling fluid conduits; anda plurality of cooling plants arranged outside the computer data center building along an exterior wall of the computer data center building, the cooling plants including one or more fluid-to-fluid heat exchangers, each of the cooling plants corresponding to one or more particular ones of the cooling fluid conduits and providing cooling for the corresponding conduit. 38. A method for cooling a computer data center, comprising: operating computers in a plurality of computer racks inside a data center building, the plurality of racks arranged in a plurality of linear rows, with particular ones of the racks housing a plurality of computer systems;operating a plurality of cooling plants outside the data center building along an exterior wall of the data center building, each of the cooling plants corresponding to one or more particular ones of the rows of racks; andcirculating cooling fluid through a plurality of cooling fluid conduits comprising cooling water pipes, the cooling fluid conduits corresponding to particular ones of the rows of racks and being served by particular ones of the cooling plants. 39. The method of claim 38, further comprising circulating cooling water from the cooling plants into a common header from which the cooling fluid conduits draw cooling fluid, so as to provide cooling diversity between the cooling plants and the data center. 40. The method of claim 38, further comprising operating the plurality of cooling plants in a closed-water cooling mode or an open-water cooling mode. 41. A method for cooling a computer data center, comprising: operating computers in a plurality of computer racks inside a data center building, the plurality of racks arranged in a plurality of linear rows, with particular ones of the racks housing a plurality of computer systems;operating a plurality of cooling plants in a chillerless mode outside the data center building along an exterior wall of the data center building, each of the cooling plants corresponding to one or more particular ones of the rows of racks;determining that conditions exceed an ability of the cooling plants operating in the chillerless mode to cool the data center building;based on the determination, operating the cooling plants with at least one chiller providing a chilled fluid to remove heat generated by at least a portion of the computer systems; andcirculating cooling fluid through a plurality of cooling fluid conduits that correspond to particular ones of the rows of racks and that are served by particular ones of the cooling plants.