Providing power to a data center

1. A method of providing power to a data center, comprising:

receiving heat from a computer data center into a working fluid of a heat pump;

transferring heat from the computer data center to the heat pump to warm a fluid that is stored in a fluid storage tank with the working fluid;

transferring heat from the computer data center to the heat pump to warm the fluid with the working fluid as the fluid flows from the fluid storage tank through at least one liquid-to-liquid heat exchanger fluidly coupled to the fluid storage tank;

circulating the warmed fluid to a flow of compressed gas during a discharging process that expands the compressed gas;

generating energy from the discharging process; and

providing at least a portion of the generated energy to the computer data center as electrical power.

2. The method of claim 1 , further comprising:

increasing the received heat into the working fluid through a compression process that adds heat to the working fluid.

3. The method of claim 2 , further comprising transferring the received heat from the computer data center and the added heat in the working fluid to the fluid.

4. The method of claim 3 , further comprising transferring the received heat from the computer data center and the added heat in the working fluid to the fluid in at least one of the at least one liquid-to-liquid heat exchanger or the fluid storage tank.

5. The method of claim 3 , further comprising transferring the received heat from the computer data center and the added heat in the working fluid to the fluid in at least one of a first liquid-to-liquid heat exchanger of the at least one liquid-to-liquid heat exchanger or the fluid storage tank.

6. The method of claim 5 , further comprising:

circulating a working liquid through a second liquid-to-liquid heat exchanger of the at least one liquid-to-liquid heat exchanger to receive heat from the working fluid;

circulating the heated working liquid from the second liquid-to-liquid heat exchanger to the first liquid-to-liquid heat exchanger; and

transferring heat from the heated working liquid to the fluid in the first liquid-to-liquid heat exchanger.

7. The method of claim 2 , further comprising:

cooling the working fluid through an expansion process; and

circulating the cooled working fluid to receive heat from the computer data center.

8. The method of claim 1 , wherein transferring heat from the computer data center to the heat pump to warm the fluid comprises:

circulating an airflow over heat-generating electronic devices within the computer data center to receive the heat generated by the heat-generating electronic devices; and

transferring the heat in the airflow to the working fluid in an air-to-liquid heat exchanger.

9. The method of claim 1 , further comprising compressing an ambient airflow with a first charger-discharger to produce the compressed gas.

10. The method of claim 9 , further comprising expanding the compressed gas with the first charger-discharger.

11. The method of claim 9 , further comprising expanding the compressed gas with a second charger-discharger that is independent of the first charger-discharger.

12. A system, comprising:

a power generation system comprising a heat pump, a pump, and a compressor-expander set, the compressor-expander set operable to expand a compressed gas and generate energy while expanding the compressed gas;

an electrical network electrically coupled to the power generation system to provide at least a portion of the generated energy to a computer data center as electrical power;

a control system communicably coupled to the power generation system and operable to perform operations comprising:

controlling the heat pump to transfer heat from the computer data center to a heat pump working fluid;

controlling the heat pump to transfer heat from the working fluid of the heat pump to a fluid that is stored in a storage tank;

controlling the heat pump to transfer heat from the heat pump working fluid of the heat pump to the fluid as the fluid flows from the storage tank through at least one heat exchanger fluidly coupled to the fluid storage tank; and

controlling the pump to circulate the warmed fluid to a flow of compressed gas while the compressed gas is expanded.

13. The system of claim 12 , wherein the heat pump comprises a vapor compressor, the control system operable to perform operations comprising controlling the heat pump to compress a vapor phase of the heat pump working fluid to add heat to the heat pump working fluid.

14. The system of claim 13 , wherein the at least one heat exchanger comprises a first heat exchanger fluidly coupled to the vapor compressor and thermally coupled to the fluid to transfer heat from the heat pump working fluid to the fluid.

15. The system of claim 14 , wherein the heat from the heat pump working fluid is transferred to the fluid in at least one of the first heat exchanger, a second heat exchanger fluidly coupled between the pump and the first heat exchanger, or storage tank fluidly coupled to the pump.

16. The system of claim 13 , wherein the heat pump comprises an orifice fluidly coupled to the vapor compressor, the orifice operable to expand the heat pump working fluid and cool the heat pump working fluid through the expansion.

17. The system of claim 16 , further comprising:

at least one fan positioned to circulate an airflow over a plurality of heat-generating electronic devices within the computer data center; and

an air-to-liquid heat exchanger positioned to receive the airflow warmed by the heat-generating electronic devices and transfer the heat of the warmed airflow to the cool heat pump working fluid.

18. The system of claim 12 , wherein the compressor-expander set is fluidly coupled to receive an ambient airflow to compress into the compressed gas.

19. The system of claim 18 , wherein the compressor-expander set comprises a first compressor-expander and a second compressor-expander, the first compressor-expander operable to compress the ambient air into the compressed gas, the second compressor-expander operable to expand the compressed gas to generate energy.

20. The system of claim 19 , wherein the second compressor-expander is independent of the first compressor-expander.

21. The method of claim 1 , wherein heat is transferred from the working fluid of the heat pump to the fluid in the fluid storage tank and to the fluid in the at least one liquid-to-liquid heat exchanger in parallel.