Methods and systems for turbulent, corrosion resistant heat exchangers

1. A support structure for use in a heat exchanger in a desiccant air conditioning system, comprising:

two molded support plates attached to each other back-to-back;

each support plate comprising an array of integrally-formed raised features on a front side thereof for providing a bonding surface for a membrane and for mixing or turbulating flow of a liquid desiccant flowing between the front side of the support plate and the membrane;

each support plate also comprising a plurality of integrally-formed raised features on a back side thereof for setting a distance from the other support plate, mixing or turbulating flow of a heat transfer fluid flowing between the support plates, and providing a bonding surface for attaching the support plates; and

each support plate also including one or more openings through which the liquid desiccant can be introduced on the front side of the plate and one or more openings for collecting the liquid desiccant.

2. The support structure of claim 1 , wherein each support plate also includes one or more openings through which the heat transfer fluid can be introduced for flowing between the support plates and one or more openings for collecting the heat transfer fluid.

3. The support structure of claim 1 , wherein the raised features on the back side of each support plate periodically touch the raised features on the backside of the other support plate to form a convoluted path for flow of the heat transfer fluid.

4. The support structure of claim 1 , wherein the raised features on the front side of each support plate are configured to generally evenly distribute liquid desiccant over the front side of the support plate.

5. The support structure of claim 1 ,wherein each support plate comprises a thermally conductive rigid plastic material.

6. The support structure of claim 1 , wherein the two molded support plates are identically constructed.

7. The support structure of claim 1 , further comprising two membranes, one on the front side of each support plate, said membranes separating the liquid desiccant on the front side of each support plate from an air stream between adjacent support structures.

8. The support structure of claim 7 , wherein each membrane is microporous such that liquid desiccant is inhibited from entering the air stream, but water vapor in the air stream can be absorbed into the liquid desiccant.

9. The support structure of claim 7 , wherein each membrane is a bi-axially stretched polypropylene membrane.

10. The support structure of claim 7 , wherein each membrane is bonded to the front side of each support plate.

11. The support structure of claim 7 , wherein each membrane has a thickness of about 7 μm.

12. The support structure of claim 7 , further comprising an air turbulator positioned on each of said membranes such that each membrane is between an air turbulator and the front side of each support plate.

13. The support structure of claim 12 , wherein each air turbulator comprises a plastic netting material.

14. The support structure of claim 12 , wherein each air turbulator comprises a series of plastic wires that span across each membrane.

15. The support structure of claim 12 , wherein each air turbulator has sloped walls for generating a counter-rotating air flow in the air stream.

16. The support structure of claim 12 , wherein the air turbulator comprises a plurality of structures, each having a wall oriented at an angle to the air stream, said wall becoming progressively shorter in the direction or counter to the direction of the air stream to impart a rotational motion to air striking the wall.

17. The support structure of claim 16 , wherein pairs of adjacent structures are oriented to impart counter rotational motion to the air stream.

18. The support structure of claim 17 , further comprising an obstruction between each pair of adjacent structures located downstream of said structures.