Methods and systems for turbulent, corrosion resistant heat exchangers

A heat exchanger for use in a desiccant air conditioning system, comprising:

• a plurality of membrane-plate assemblies facing each other in a generally parallel arrangement and being spaced apart to define air gaps therebetween through which air to be treated by the desiccant air conditioning system can flow, each of said membrane-plate assemblies comprising:
• (a) a plate structure,
• (b) two membranes, each facing an opposite side of the plate structure and spaced apart from the plate structure to define a gap therebetween through which a liquid desiccant can flow, and
• (c) at least one desiccant drain port,
• wherein each membrane has a bottom portion that is sealed to the plate structure such that liquid desiccant is forced to flow through the at least one drain port, thereby creating a negative pressure in the gap between each membrane and the plate structure.