Immersion cooling temperature control method, system, and apparatus

• US 10,438,867 B2
• Filed: 03/08/2018
• Issued: 10/08/2019
• Est. Priority Date: 03/08/2018
• Status: Active Grant

• Current Assignee: Northrop Grumman Systems Corporation (Northrop Grumman Corporation)
• Original Assignee: Northrop Grumman Systems Corporation (Northrop Grumman Corporation)
• Inventors: Christiansen, Martin Brokner, Chorosinski, Leonard George, Heffner, Harlan Craig, Wakamiya, Stanley Katsuyoshi, Kirkwood, Keith R.
• Primary Examiner(s): Buttar, Mandeep S
• Application Number:
  US15/916,019
• Publication Number:
  US 20190279916A1
• Time in Patent Office: 579 Days
• Field of Search: 361676, 361700, 361749, 361796, 36167947, 36167954, 361699, 361688, 361702, 361703, 361709, 361720, 361728, 361748, 361801, 361802, 16510426, 16510433, 16510421, 165100, 257E23088
• CPC Class Codes: G06F 1/206 comprising thermal management
• CPC Class Codes: G06F 2200/201 Cooling arrangements using cooling fluid
• CPC Class Codes: H01L 23/44 the complete device being wholly immersed in a fluid other than air H01L23/427 takes precedence
• CPC Class Codes: H05K 7/203 by immersion
• CPC Class Codes: H05K 7/20372 Cryogenic cooling; Nitrogen liquid cooling
• CPC Class Codes: H05K 7/20518 Unevenly distributed heat load, e.g. different sectors at different temperatures, localised cooling, hot spots
• CPC Class Codes: H05K 7/20636 within sub-racks for removing heat from electronic boards

Abstract

An apparatus for providing immersion cooling in a circuit card environment includes a circuit card having first and second longitudinally spaced circuit card subassemblies, connected together into a single circuit card oriented substantially in a lateral-longitudinal plane. The first and second circuit card subassemblies have first and second operating temperatures, respectively, which are different from one another. A thermal energy transfer device is operatively connected to an area of the circuit card correlated with a selected one of the first and second circuit card subassemblies. The thermal energy transfer device at least partially induces the respective one of the first and second operating temperatures to the selected circuit card subassembly. The thermal energy transfer device transversely overlies at least a supermajority of the selected circuit card subassembly and is laterally spaced from the other circuit card subassembly. A system and method for providing immersion cooling are also provided.

Claims

1. An apparatus for providing immersion cooling in a circuit card environment, the apparatus comprising:

a circuit card including first and second longitudinally spaced circuit card subassemblies, connected together into a single circuit card oriented substantially in a lateral-longitudinal plane, the first and second circuit card subassemblies being connected together by a laterally extending card connector oriented in a parallel lateral-longitudinal plane to the first and second circuit card subassemblies, the first and second circuit card subassemblies having first and second operating temperatures, respectively, the first and second operating temperatures being different from one another, each circuit card subassembly including a plurality of IC chips extending transversely from a subassembly substrate, each subassembly substrate being transversely mounted on the card connector, the card connector having a surface area larger than the combined surface area of the subassembly substrates of the first and second circuit card subassemblies; and

a thermal energy transfer device operatively connected to an area of the circuit card correlated with a selected one of the first and second circuit card subassemblies, the thermal energy transfer device at least partially inducing the respective one of the first and second operating temperatures to the selected circuit card subassembly, the thermal energy transfer device transversely overlying at least a supermajority of the selected circuit card subassembly and being laterally spaced from the other circuit card subassembly.

2. The apparatus of claim 1, wherein the thermal energy transfer device is a first thermal energy transfer device, and including a second thermal energy transfer device operatively connected to an area of the circuit card correlated with the other one of the first and second circuit card subassemblies, the second thermal energy transfer device at least partially inducing the respective one of the first and second operating temperatures to the other circuit card subassembly, the second thermal energy transfer device transversely overlying at least a supermajority of the other circuit card subassembly and being laterally spaced from the selected circuit card subassembly.

3. The apparatus of claim 1, wherein the thermal energy transfer device is a circulating-coolant heat sink.

4. The apparatus of claim 3, wherein the thermal energy transfer device includes a coolant liquid supply fitting and a coolant vapor return fitting.

5. The apparatus of claim 4, wherein the thermal energy transfer device includes an internal liquid flow channel in fluid connection with the coolant liquid supply fitting and an internal vapor flow channel in fluid connection with the coolant vapor return fitting, the internal liquid flow channel and internal vapor flow channel being in mutual fluid communication for transfer of at least one of liquid and vapor coolant across at least a portion of a circuit card subassembly in a coolant transfer direction substantially within a lateral-longitudinal plane.

6. The apparatus of claim 1, wherein the thermal energy transfer device is in direct thermally conductive contact with at least a portion of the selected circuit card subassembly.

7. The apparatus of claim 1, wherein the circuit card and the thermal energy transfer device are collectively contained in a vacuum ambient environment.

8. The apparatus of claim 1, wherein the card connector is less thermally conductive than either of the first and second circuit card subassemblies.

9. The apparatus of claim 1, wherein the thermal energy transfer device includes a transversely extending thermal lip which is located at least partially in a same lateral-longitudinal plane as the circuit card.

10. A method of providing immersion cooling in a circuit card environment, the method comprising:

providing an apparatus including;

first and second longitudinally spaced circuit card subassemblies connected together into a single circuit card oriented substantially in a lateral-longitudinal plane, the first and second circuit card subassemblies being connected together by a laterally extending card connector oriented in a parallel lateral-longitudinal plane to the first and second circuit card subassemblies, each circuit card subassembly including a plurality of IC chips extending transversely from a subassembly substrate, each subassembly substrate being transversely mounted on the card connector, the card connector having a surface area larger than the combined surface area of the subassembly substrates of the first and second circuit card subassemblies, and

a thermal energy transfer device transversely overlying at least a supermajority of a selected one of the first and second circuit card subassemblies and being laterally spaced from an other circuit card subassembly;

configuring the first circuit card subassembly for operation at a first operating temperature;

configuring the second circuit card subassembly for operation at a second operating temperature which is different from the first operating temperature;

operatively connecting the thermal energy transfer device to the selected one of the first and second circuit card subassemblies; and

inducing the respective one of the first and second operating temperatures to the selected circuit card subassembly at least partially with the thermal energy transfer device.

11. The method of claim 10, wherein

providing an apparatus includes:

providing the thermal energy transfer device as a first thermal energy transfer device, and

providing a second thermal energy transfer device transversely overlying at least a supermajority of the other one of the first and second circuit card subassemblies and being laterally spaced from the selected circuit card subassembly; and

the method further includes;

operatively connecting the second thermal energy transfer device to the other one of the first and second circuit card subassemblies; and

inducing the respective one of the first and second operating temperatures to the other circuit card subassembly at least partially with the second thermal energy transfer device.

12. The method of claim 10, wherein providing an apparatus includes providing the thermal energy transfer device with a coolant liquid supply fitting and a coolant vapor return fitting.

13. The method of claim 12, wherein

providing an apparatus includes:

providing the thermal energy transfer device with an internal liquid flow channel in fluid connection with the coolant liquid supply fitting and an internal vapor flow channel in fluid connection with the coolant vapor return fitting; and

the method further includes;

bringing the internal liquid flow channel and internal vapor flow channel into mutual fluid communication; and

transferring at least one of liquid and vapor coolant across at least a portion of a circuit card subassembly, between the internal liquid flow channel and internal vapor flow channel, in a coolant transfer direction substantially within a lateral-longitudinal plane.

14. The method of claim 10, wherein providing an apparatus includes placing the thermal energy transfer device in direct thermally conductive contact with at least a portion of the selected circuit card subassembly.

15. The method of claim 10, including collectively containing the circuit card and the thermal energy transfer device in a vacuum ambient environment.

16. The method of claim 10, wherein operatively connecting the second thermal energy transfer device to the other one of the first and second circuit card subassemblies includes causing a transversely extending thermal lip of the thermal energy transfer device to be located at least partially in a same lateral-longitudinal plane as the circuit card.

17. A system for providing immersion cooling in a circuit card environment, the system comprising:

a plurality of apparatuses, each apparatus comprising

two longitudinally adjacent circuit card subassemblies maintained in close spatial proximity to each other on a single circuit card, the first and second circuit card subassemblies having first and second operating temperatures, respectively, the first and second operating temperatures being different from one another, with low thermal parasitic heat transfer between the two circuit card subassemblies due to the presence of circulating coolant-type first and second thermal energy transfer devices transversely overlying an area of the circuit card correlated with a respective one of the first and second circuit card subassemblies, the first and second thermal energy transfer devices at least partially inducing the respective one of the first and second operating temperatures to the respective first and second circuit card subassemblies;

a housing substantially surrounding the plurality of apparatuses in a transverse-longitudinal plane;

a first cooling fluid manifold selectively introducing a first cooling fluid into, and selectively removing the first cooling fluid from, the first thermal energy transfer device; and

a second cooling fluid manifold selectively introducing a second cooling fluid into, and selectively removing the second cooling fluid from, the second thermal energy transfer device.