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A cooling system for transferring heat from a heat load to an environment has a volatile working fluid. The cooling system includes first and second cooling cycles that are thermally connected to the first cooling cycle. The first cooling cycle is not a vapor compression cycle and includes a pump, a

A cooling system for transferring heat from a heat load to an environment has a volatile working fluid. The cooling system includes first and second cooling cycles that are thermally connected to the first cooling cycle. The first cooling cycle is not a vapor compression cycle and includes a pump, an air-to-fluid heat exchanger, and a fluid-to-fluid heat exchanger. The second cooling cycle can include a chilled water system for transferring heat from the fluid-to-fluid heat exchanger to the environment. Alternatively, the second cooling cycle can include a vapor compression system for transferring heat from the fluid-to-fluid heat exchanger to the environment.

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1. A cooling system for transferring heat from a heat load, the cooling system comprising: a two-phase working fluid;a pump configured to increase the pressure of the working fluid without substantially increasing the enthalpy of the working fluid;an air-to-fluid heat exchanger in fluid communicatio

1. A cooling system for transferring heat from a heat load, the cooling system comprising: a two-phase working fluid;a pump configured to increase the pressure of the working fluid without substantially increasing the enthalpy of the working fluid;an air-to-fluid heat exchanger in fluid communication with the pump and in thermal communication with the heat load;a fluid-to-fluid heat exchanger having a first fluid path in fluid communication with the air-to-fluid heat exchanger and the pump, and a second fluid path, the first and second fluid paths being in thermal communication with one another;a second heat transfer system in fluid communication with the second fluid path and comprising: a second portion of the fluid-to-fluid heat exchanger;a single phase working fluid; anda pump;wherein air passing through the air-to-fluid heat exchanger causes at least a portion of the two-phase working fluid to change phase from a liquid to a gas within the air-to-fluid heat exchanger; anda controller operatively coupled to at least the second fluid path and configured to prevent condensation on the air-to-fluid heat exchanger by controlling the amount of heat transferred to the second fluid path so that a temperature of the two-phase working fluid within the air-to-fluid heat exchanger is above a dew point temperature of the air passing through the air-to-fluid heat exchanger. 2. The cooling system of claim 1, further comprising a flow regulator positioned between the pump and the air-to-fluid heat exchanger. 3. A cooling system for transferring heat from a heat load to an environment, the cooling system comprising: a first cooling cycle containing a two-phase working fluid; anda second cooling cycle thermally connected to the first cooling cycle;wherein the first cooling cycle comprises: a pump configured to increase the pressure of the working fluid without substantially increasing the enthalpy of the working fluid;an air-to-fluid heat exchanger in fluid communication with the pump and in thermal communication with the heat load;a second heat exchanger having a first fluid path for the working fluid in fluid communication with the air-to-fluid heat exchanger and the pump, and a second fluid path comprising a portion of the second cooling cycle;wherein the first and second fluid paths are in thermal communication with one another;wherein the heat load causes at least a portion of the two-phase working fluid to change phase from a liquid to a gas within the air-to-fluid heat exchanger; andwherein the second cooling cycle comprises a chilled water system in thermal communication with the environment and wherein the second cooling cycle is controlled to maintain a temperature of the two-phase working fluid entering the air-to-fluid heat exchanger above a dew point of air flowing through the air-to-fluid heat exchanger. 4. A cooling system for transferring heat from a heat load to an environment, the cooling system comprising: a working fluid pump configured to increase the pressure of a two-phase working fluid without substantially increasing the enthalpy of the working fluid;an air-to-fluid heat exchanger connected to the pump and having a fluid path in thermal communication with the heat load;a second heat exchanger having first and second fluid paths in thermal communication with one another, wherein the first fluid path provides fluid communication from the air-to-fluid heat exchanger to the pump, and wherein the second fluid path is adapted to thermally connect the air-to-fluid heat exchanger in the first fluid path to a chilled water cooling system that is in thermal communication with the environment;wherein air passing through the air-to-fluid heat exchanger transfers heat from the heat load and causes at least a portion of the working fluid to change phase from a liquid to a gas; anda controller operatively coupled to the chilled water cooling system and configured to maintain a temperature of the working fluid between the second heat exchanger and the air-to-fluid heat exchanger above a dew point temperature of the air passing through the air-to-fluid heat exchanger so that the cooling system removes only sensible heat from the air and thereby prevents condensation on the air-to-fluid heat exchanger. 5. A heat transfer system, comprising: a first heat transfer subsystem adapted to circulate there through a first working fluid, wherein the first working fluid is selected from the group consisting of:chlorofluorocarbons, hydrofluorocarbons and hydrochlorofluorocarbons, comprising: at least one air-to-fluid heat exchanger in thermal communication with a heat load;a pump configured to increase the pressure of the first working fluid without substantially increasing the enthalpy of the first working fluid; andat least a portion of a second heat exchanger;a second heat transfer subsystem comprising: at least a second portion of the second heat exchanger anda third heat exchanger;the second heat transfer subsystem adapted to circulate a second working fluid there through, wherein the second working fluid is selected from the group consisting of: water, water-ethylene glycol, and water-propylene glycol; andwherein air passing through the air-to-fluid heat exchanger causes at least a portion of the first working fluid to undergo a phase change from a liquid to a gas in the first heat transfer subsystem; anda system controller operatively coupled to the second subsystem and configured to prevent condensation on the air-to-fluid heat exchanger by maintaining the first working fluid leaving the second heat exchanger above a dew point temperature of the air passing through the air-to-fluid heat exchanger. 6. The system of claim 5, wherein the heat load is a room. 7. The system of claim 5, wherein the heat load is an electronics cabinet. 8. The system of claim 5 further comprising a flow regulator associated with at least one of the plurality of air-to-fluid heat exchangers and which is adapted to control an amount of first working fluid flowing through the associated air-to-fluid heat exchanger. 9. The system of claim 8, wherein the flow regulator is adapted to control the amount of first working fluid flowing through the air-to-fluid heat exchanger independently of fluid pressure. 10. The system of claim 8, wherein the flow regulator is adapted to maintain a substantially constant flow of first working fluid through the air-to-fluid heat exchanger. 11. The system of claim 8, further comprising a receiver in fluid communication with the first heat transfer subsystem for accumulating a portion of the first working fluid. 12. The system of claim 11, wherein the receiver is adapted to accumulate a portion of the first working fluid based upon temperature and/or heat load. 13. The system of claim 8, further comprising a flow regulator associated with each of the plurality of air-to-fluid heat exchangers and which are adapted to limit an amount of first working fluid flowing through each of the associated air-to-fluid heat exchangers. 14. The system of claim 5, wherein the second heat exchanger is selected from the group consisting of: a tube-in-tube heat exchanger, a shell and tube heat exchanger and a plate and frame heat exchanger. 15. The cooling system of claim 1, further comprising a working fluid receiver in fluid communication between the fluid-to-fluid heat exchanger and the pump. 16. The cooling system of claim 1, further comprising a working fluid flow regulating valve in fluid communication between the pump and the air-to-fluid heat exchanger and a working fluid receiver in fluid communication between the fluid-to-fluid heat exchanger and the pump. 17. The cooling system of claim 3, further comprising a working fluid receiver in the first cooling cycle between the second heat exchanger and the pump. 18. The cooling system of claim 3, further comprising a working fluid flow regulating valve in fluid communication between the pump and the air-to-fluid heat exchanger and a working fluid receiver in fluid communication between the second heat exchanger and the pump. 19. The cooling system of claim 4, further comprising a working fluid receiver in fluid communication between the second heat exchanger and the pump. 20. The cooling system of claim 4, further comprising a working fluid flow regulating valve in fluid communication between the pump and the air-to-fluid heat exchanger and a working fluid receiver in fluid communication between the second heat exchanger and the pump. 21. The cooling system of claim 5, further comprising a working fluid receiver in the first heat transfer subsystem between the second heat exchanger and the pump. 22. The cooling system of claim 5, further comprising a working fluid flow regulating valve in fluid communication between the pump and the air-to-fluid heat exchanger and a working fluid receiver in fluid communication between the second heat exchanger and the pump. 23. A cooling system for removing heat from a high density heat load, comprising: a first heat transfer system comprising: a two-phase working fluid;a plurality of air-to-fluid heat exchangers configured to transfer heat from the load to the working fluid so that at least a portion of the working fluid changes phase from a liquid to a gas within at least one of the air-to-fluid heat exchangers;a working fluid flow regulator associated with at least one of the plurality of air-to-fluid heat exchangers and configured to limit the maximum working fluid flow to each air-to-fluid heat exchangera working fluid receiver configured to hold working fluid based on working fluid temperature or cooling system load;a pump configured to increase the pressure of the working fluid without substantially increasing the enthalpy of the working fluid; anda first portion of a fluid-to-fluid heat exchanger;wherein all of the first heat transfer system is arranged in fluid communication;a second heat transfer system comprising: a second portion of the fluid-to-fluid heat exchanger;a single-phase working fluid;a pump; andwherein all of the second heat transfer system is arranged in fluid communication;wherein the first heat transfer system is thermally coupled to the second heat transfer system by the fluid-to-fluid heat exchanger; anda cooling system controller monitoring the dew point temperature of air flowing through the air-to-fluid heat exchanger, and operatively connected to the second heat transfer system to prevent condensation on the air-to fluid heat exchangers by maintaining the first heat transfer system working fluid entering the air-to-fluid heat exchangers at a temperature above the dew point temperature of the air flow. 24. The system of claim 23, wherein the air-to-fluid heat exchangers are located within an enclosure and the high density heat load is created by electronics within the enclosure, the enclosure having a forced air flow path across the electronics and through the air-to-fluid heat exchangers. 25. The system of claim 24, wherein first heat transfer system is configured so that the working fluid is cooled in the fluid-to-fluid heat exchanger and then flows to the receiver and pump, and then flows through the regulating valves and then into each air-to-fluid heat exchanger where at least a portion of the working fluid boils in each air-to-fluid heat exchanger, and then the heated working fluid returns to the fluid-to-fluid heat exchanger where it is once again cooled. 26. The system of claim 23, wherein the single-phase working fluid is selected from the group consisting of: water, water-ethylene glycol, and water-propylene glycol. 27. The system of claim 23, further including a working fluid flow regulator associated with each air-to-fluid heat exchanger and each flow regulator configured to limit the maximum working fluid flow to each air-to-fluid heat exchanger.