Two-phase heat transfer system including a thermal capacitance device

1. A two-phase heat transfer system comprising:

a condenser configured to condense vapor;

a liquid line fluidly connected to the condenser;

a vapor line fluidly connected to the condenser; and

an evaporating unit including:

an evaporator fluidly connected to the liquid line and to the vapor line and configured to receive heat from a heat source, the evaporator comprising a core having a liquid passage formed therein; and

a thermal capacitance device integrated with the evaporator, the thermal capacitance device comprising a thermal storage unit including a block having a plurality of channels formed therein, the plurality of channels extending in a direction substantially parallel to the liquid passage formed in the core of the evaporator, and wherein a portion of the block is in contact with a portion of the evaporator.

2. The two-phase heat transfer system of claim 1 , wherein each channel of the plurality of channels has a phase change material disposed therein.

3. The two-phase heat transfer system of claim 1 , wherein the block surrounds the evaporator, an inner surface of the block contacting an outer surface of the evaporator.

4. The two-phase heat transfer system of claim 1 , wherein each channel of the plurality of channels feeds into a plenum that is fluidly coupled to each of the channels.

5. The two-phase heat transfer system of claim 4 , wherein the thermal storage unit includes end caps that seal to the block to maintain the phase change material within the channels and the plenum.

6. The two-phase heat transfer system of claim 1 , wherein the plurality of channels formed in the block surround the evaporator.

7. The two-phase heat transfer system of claim 1 , wherein the evaporating unit comprises a plurality of evaporator units, each evaporating unit comprising:

an evaporator fluidly connected to the liquid line and to the vapor line and configured to receive heat from a heat source; and

a thermal capacitance device integrated with the evaporator.

8. The two-phase heat transfer system of claim 1 , wherein the condenser comprises a thermal capacitance device, the condenser thermally coupled with a condenser side of the thermal capacitance device.

9. The two-phase heat transfer system of claim 8 , wherein the thermal capacitance device is disposed within the condenser.

10. The two-phase heat transfer system of claim 1 , wherein the evaporator comprises a wick disposed within the core of the evaporator.

11. The two-phase heat transfer system of claim 10 , wherein the evaporator further comprises a secondary wick disposed within the core and the wick of the evaporator.

12. The two-phase heat transfer system of claim 1 , wherein the thermal storage unit comprises at least one plenum formed therein adjacent to the block, each channel of the plurality of channels formed in the block being in fluid communication with the at least one plenum.

13. The two-phase heat transfer system of claim 12 , wherein the at least one plenum formed in the thermal storage unit comprises two plenums formed in the thermal storage unit adjacent to opposing ends of the block, each channel of the plurality of channels formed in the block being in fluid communication with each of the two plenums.