Data center cooling system

1. A cooling system configured to remove heat from a chimney of a server cabinet comprising:

the chimney having an extending portion extending above a server rack;

a chimney heat exchanger unit including a chimney heat exchanger disposed in the extending portion of the chimney above the server rack;

the chimney heat exchanger having a fluid inlet for receiving a working fluid, and a fluid outlet for discharging the working fluid;

the chimney heat exchanger also having an upstream surface receiving warm waste heat generated by one or more servers; and

the chimney heat exchanger also having a downstream surface that discharges cooled air cooled by the chimney heat exchanger;

wherein the server can be accessed through the chimney without moving the chimney heat exchanger; and

wherein an air handler heat exchanger further cools cooled air from the chimney and returns cold air to the server rack.

2. The cooling system according to claim 1 , further comprising air handler working fluid of the air handler heat exchanger to further cool the cooled air discharged from the chimney heat exchanger.

3. The cooling system of claim 2 , wherein the warmed air handler working fluid is cooled by chiller working fluid.

4. The cooling system of claim 3 , wherein the warmed chiller working fluid is cooled in a second heat exchanger.

5. The cooling system of claim 1 , wherein the second heat exchanger cools the working fluid.

6. The cooling system of claim 4 , wherein the chiller working fluid is combined with the chimney heat exchanger fluid before cooling.

7. The cooler system of claim 6 , wherein a portion of the cooled working fluid is returned to the chiller and the remainder is returned to the chimney heat exchanger.

8. The cooler system of claim 1 , wherein the working fluid in the chimney heat exchanger is concurrent with the flow of the waste heat flow.

9. A cooling system configured to remove heat from a chimney of a server rack, wherein;

the chimney has an upper portion that extends upward from the top of the server rack;

a chimney heat exchanger is disposed within the upper portion;

the chimney heat exchanger has a fluid inlet for receiving a working fluid, and a fluid outlet for discharging the working fluid;

the chimney heat exchanger also has an upstream surface receiving warm waste heat generated by one or more servers; and

the chimney heat exchanger also had a downstream surface that discharges cooled air cooled by the chimney heat exchanger;

wherein the server can be accessed through the chimney without moving the chimney heat exchanger; and

wherein an air handler heat exchanger further cools cooled air from chimney and returns cold air to the server rack.

10. The cooling system of claim 9 , further comprising a second fluid heat exchanger in thermal communication with a cooling tower in a second heat exchanger circuit.

11. The cooling system of claim 10 , wherein the working fluid is passively conveyed from the second fluid heat exchanger in the second heat exchanger circuit to the chimney heat exchanger.

12. The cooling system of claim 9 , wherein the working fluid at least partially changes phase in the chimney heat exchanger.

13. The cooling system of claim 12 , wherein the second heat exchanger in the second heat exchanger circuit cools warm chimney heat exchanger working fluid.

14. The cooling system of claim 9 , wherein the air handler heat exchanger is connected to the chimney heat exchanger by a return air plenum configured to conduct the cooled air from chimney and an air supply conduit configured to conduct the cold air to the server rack.

15. The cooling system of claim 9 , wherein a chiller cools air handler heat exchanger working fluid.

16. The cooling system of claim 15 , wherein the chiller is in thermal communication with an air handler cooling tower.

17. The cooler system of claim 9 , wherein the working fluid in the chimney heat exchanger is concurrent with the flow of the waste heat flow.

18. The cooler system of claim 9 , further comprising a fluid level controller.

19. The cooler system of claim 12 , further comprising a fluid level controller.

20. The cooler system of claim 19 , wherein a fraction of heat removed by phase change is at least about 10 percent of the total heat transfer.