System and method for managing water content in a fluid

• US 7,942,387 B2
• Filed: 08/27/2007
• Issued: 05/17/2011
• Est. Priority Date: 08/25/2006
• Status: Active Grant

• Current Assignee: DuCool, Ltd.
• Original Assignee: DuCool, Ltd.
• Inventors: Forkosh, Dan
• Primary Examiner(s): Chiesa; Richard L
• Application Number:
  US12/438,617
• Publication Number:
  US 20100013112A1
• Time in Patent Office: 1,359 Days
• Field of Search: 261/21, 261/26, 261/36.1, 261115-118, 261/151, 62/78, 62/94, 622/71, 623/10, 625/15, 951/87, 952/31, 962/42, 962/47, 962/49, 962/66
• US Class Current: 261/26
• CPC Class Codes: F24F 2003/1458 using regenerators
• CPC Class Codes: F24F 3/1417 with liquid hygroscopic desiccants

Abstract

A system and method for managing water content in a fluid include a collection chamber for collecting water from the fluid with a desiccant, and a regeneration chamber for collecting water from the desiccant and transferring it to a second fluid. An evaporator cools the desiccant entering the collection chamber, and a condenser heats the desiccant entering the regeneration chamber. Diluted desiccant from the collection chamber is exchanged with concentrated desiccant from the regeneration chamber in such a way as to efficiently control the transfer of both mass and heat between the chambers. In one embodiment, mass is not exchanged until one or both of the desiccant levels in the chambers exceeds a predetermined level. Heat is transferred between the two desiccant flows as they are transferred between the chambers. This increases efficiency and reduces the energy input required for the evaporator and the condenser.

Claims

1. A system for managing water content in a fluid, comprising:

a first chamber including an inlet and an outlet for facilitating movement of a first fluid into and out of the first chamber;

a desiccant capable of being introduced into the first chamber for removing water from the first fluid moving through the first chamber;

a second chamber including an inlet and an outlet for facilitating movement of a second fluid into and out of the second chamber, thereby facilitating evaporation of water from the desiccant in the second chamber into the second fluid, one chamber of the first and second chambers including a bottom and a wall having an aperture therein disposed at a predetermined height from the bottom such that desiccant overflows from the one chamber and automatically enters the other chamber of the first and second chambers through the aperture when the desiccant in the one chamber reaches a level at least as high as the aperture;

a valve configured to receive desiccant from the other chamber and having an open position for facilitating a flow of desiccant from the other chamber to the one chamber, and a closed position for inhibiting the flow of desiccant from the other chamber to the one chamber;

a level sensor at least partially disposed within the other chamber and configured to open the valve when the level of the desiccant in the other chamber reaches at least a first predetermined level, and to close the valve when the level of the desiccant in the other chamber drops below a second predetermined level; and

a pump configured to pump the desiccant from the other chamber to the one chamber when the valve is open.

2. The system for managing water of claim 1, wherein the desiccant includes a liquid desiccant.

3. The system for managing water of claim 1, wherein the one chamber is the first chamber, and the other chamber is the second chamber.

4. The system for managing water of claim 3, further comprising a heat exchanger configured to receive desiccant pumped from the second chamber to the first chamber and to remove heat from the desiccant before it enters the first chamber.

5. The system for managing water of claim 4, wherein the heat exchanger is positioned to create a fluid path between the first and second chambers, and is further configured to:

receive desiccant from the first chamber as it exits the first chamber through the aperture, and facilitate flow of the exiting desiccant from the first chamber to the second chamber, and

facilitate the transfer of heat from the desiccant being pumped from the second chamber to the desiccant exiting the first chamber through the aperture.

6. The system for managing water of claim 4, wherein the heat exchanger is connected to an external cooling source for removing the heat from the desiccant before it enters the first chamber.

7. The system for managing water of claim 4, wherein the heat exchanger is disposed upstream of the valve such that it receives desiccant pumped from the second chamber prior to the desiccant flowing through the valve.

8. The system for managing water of claim 7, wherein the heat exchanger is connected to an external cooling source for removing the heat from the desiccant before it enters the first chamber.

9. The system for managing water of claim 1, wherein the level sensor includes a float system having a float and an actuator configured to cooperate with the float and to actuation of the valve between the open and closed positions.

10. The system for managing water of claim 1, wherein the valve includes an electro-mechanical apparatus for opening and closing the valve.

11. The system for managing water of claim 1, wherein the aperture has a width of approximately 1-3 centimeters (cm), and a height of approximately 1-10 cm.

12. A method for managing water content in a fluid using a system including a first chamber including an inlet and an outlet to facilitate movement of a first fluid into and out of the first chamber, a liquid desiccant capable of being introduced into the first chamber for removing water from the first fluid moving through the first chamber, and a second chamber including an inlet and an outlet for facilitating movement of a second fluid into and out of the second chamber to facilitate evaporation of water from the desiccant in the second chamber into the second fluid, one chamber of the first and second chambers including a wall and a bottom, the method comprising:

removing water from the first fluid using a process that includes exposing at least some of the first fluid to the desiccant, thereby increasing the water content of at least some of the desiccant;

introducing at least some of the desiccant having increased water content into a second fluid, thereby facilitating evaporation of water from the desiccant into the second fluid and increasing water content of the second fluid;

providing an aperture in the wall of the one chamber at a predetermined height from the bottom such that desiccant overflows from the one chamber and automatically enters the other chamber of the first and second chambers through the aperture when the desiccant in the one chamber reaches a level at least as high as the aperture;

automatically transferring desiccant from the other chamber of the first and second chambers to the one chamber when the when the level of the desiccant in the other chamber reaches at least a first predetermined level; and

automatically stopping the transfer of the desiccant from the other chamber to the one chamber when the level of the desiccant in the other chamber drops below a second predetermined level.

13. The method of claim 12, wherein the first predetermined level is greater than the second predetermined level.

14. The method of claim 13, wherein the step of automatically transferring desiccant from the other chamber to the one chamber includes automatically opening a valve when the level of the desiccant in the other chamber reaches at least the first predetermined level, and

wherein the step of automatically stopping the transfer of the desiccant from the other chamber to the one chamber includes automatically closing the valve when the level of the desiccant in the other chamber drops below the second predetermined level.

15. The method of claim 12, further comprising cooling the desiccant being transferred from the other chamber to the one chamber before it reaches the one chamber.

16. The method of claim 15, wherein the step of cooling the desiccant being transferred from the other chamber to the one chamber includes transferring heat from the desiccant to a cooling source external to the system.

17. The method of claim 12, the other chamber being configured to receive the desiccant exiting the one chamber through the aperture, the method further comprising heating the desiccant after it exits the one chamber before it enters the other chamber.

18. The method of claim 17, wherein the step of heating the desiccant after it exits the one chamber includes transferring heat to the exiting desiccant from the desiccant being automatically transferred from the other chamber to the one chamber.