System and method for separating components of a fluid coolant for cooling a structure

• US 8,651,172 B2
• Filed: 03/22/2007
• Issued: 02/18/2014
• Est. Priority Date: 03/22/2007
• Status: Active Grant

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Wyatt, William G., Weber, Richard M.
• Primary Examiner(s): CIRIC, LJILJANA V
• Application Number:
  US11/689,947
• Publication Number:
  US 20080229780A1
• Time in Patent Office: 2,525 Days
• Field of Search: 165/272, 165/274, 165/104.21, 165/104.33, 62/85, 621/19, 622/592
• US Class Current: 165/272
• CPC Class Codes: F25B 23/006 boiling cooling systems

Abstract

A cooling system for a heat-generating structure includes a heating device, a cooling loop, and one or more reservoirs. The heating device is configured to heat fluid coolant comprising a mixture of water and antifreeze and vaporize a portion of the water into vapor while leaving a portion of the antifreeze as liquid in the fluid coolant. The cooling loop has a portion that splits the fluid coolant received from the heating device into a first path configured to receive at least some of the portion of the water as vapor and a second path configured to receive at least some of the portion of the antifreeze as liquid. The one or more reservoirs are configured to receive one of the at least some of the portion of the water as vapor from the first path or the at least some of the portion of the antifreeze as liquid from the second path.

Claims

1. A cooling system for a heat-generating structure disposed in an environment having an ambient pressure, the cooling system comprising:

a heating device configured to heat fluid coolant comprising a mixture of water and antifreeze and vaporize a portion of the water into vapor while leaving an unvaporized portion of the antifreeze as liquid in the fluid coolant;

a cooling loop configured to direct the fluid coolant to and from the heating device;

a reservoir connected to the cooling loop, the reservoir configured to receive at least some of the unvaporized portion of the antifreeze as liquid from the cooling loop;

a structure configured to reduce a pressure of the fluid coolant to a subambient pressure at which the fluid coolant has a boiling temperature less than a temperature of the heat-generating structure; and

a heat exchanger in thermal communication with the heat-generating structure, the heat exchanger having an inlet port and an outlet port, the inlet port configured to receive fluid coolant in the form of a liquid, and the outlet port configured to dispense of fluid coolant out of the heat exchanger in the form of a vapor, wherein heat from the heat-generating structure causes the fluid coolant in the form of a liquid to boil and vaporize in the heat exchanger so that the fluid coolant absorbs heat from the heat-generating structure as the fluid coolant changes state.

2. A cooling system for a heat-generating structure, the cooling system comprising:

a heating device configured to heat fluid coolant comprising a mixture of water and antifreeze and vaporize a portion of the water into vapor while leaving an unvaporized portion of the antifreeze as liquid in the fluid coolant;

a cooling loop configured to direct the fluid coolant to and from the heating device; and

a reservoir connected to the cooling loop, the reservoir configured to at least some of the unvaporized portion of the antifreeze as liquid from the cooling loop.

3. The cooling system of claim 2, further comprising:

a heat exchanger in thermal communication with the heat-generating structure, the heat exchanger having an inlet port and an outlet port, the inlet port configured to receive the fluid coolant in the form of a liquid, and the outlet port configured to dispense of a portion of the fluid coolant out of the heat exchanger substantially in the form of a vapor, wherein heat from the heat-generating structure causes the fluid coolant in the form of a liquid to boil and vaporize in the heat exchanger so that the fluid coolant absorbs heat from the heat-generating structure as the fluid coolant changes state, and the cooling loop is configured to direct a flow of the fluid coolant to one or both of the heating device and the heat exchanger.

4. The cooling system of claim 3, further comprising:

a condenser heat exchanger configured to receive the portion of the water as vapor and condense the vapor to liquid for storage in an expansion reservoir.

5. The cooling system of claim 4, further comprising:

a storage pump configured to pump fluid coolant to the cooling loop in an amount commensurate with an amount of liquid stored in the expansion reservoir.

6. The cooling system of claim 3, wherein the reservoir is configured to store the at least some of the portion of the antifreeze as liquid while allowing at least some of the portion of the water as vapor to remain in the cooling loop.

7. The cooling system of claim 6, further comprising:

a controller; and

a transducer configured to measure a pressure of the vapor from the one or both of the heating device and the heat exchanger and to send a signal to the controller,

wherein the controller is configured to instruct a storage pump to remove the liquid in the fluid coolant into the reservoir at a rate commensurate with a rate of the vapor production from the one or both of the heating device and the heat exchanger.

8. The cooling system of claim 3, wherein the fluid coolant is directed to the heating device until the fluid coolant in the cooling loop has reached a predetermined level of separation between the antifreeze and the water.

9. The cooling system of claim 3, wherein the heat-generating structure is disposed in an environment having an ambient pressure, the cooling system further comprising:

a structure configured to reduce a pressure of the fluid coolant to a subambient pressure at which the fluid coolant has a boiling temperature less than a temperature of the heat-generating structure.

10. The cooling system of claim 2, further comprising:

a mixture sensor configured to sense a percentage of the antifreeze present in the fluid coolant in the cooling loop; and

a controller configured to control opening and closing of a valve permitting the fluid coolant to flow to the heating device and then to the reservoir based on the percentage of the antifreeze present in the fluid coolant in the cooling loop.

11. The cooling system of claim 10, wherein the predetermined mixture level is an amount of water pulled out of the cooling loop.

12. The cooling system of claim 10, wherein the predetermined mixture level is an amount less than a defined percentage of antifreeze left in the cooling loop.

13. The cooling system of claim 12, wherein the defined percentage of antifreeze left in the cooling loop is five percent.

14. The cooling system of claim 2, further comprising:

a condenser heat exchanger configured to condense the at least some of the portion of the water as vapor into liquid; and

a second reservoir connected to the cooling loop, the second reservoir configured to one of (i) receive at least some of the portion of the water as liquid from the cooling loop or (ii) provide stored water to the cooling loop.