18 permeation-selectivity trade-off: using novel materials and intelligent system configurations to design membranes that are highly permeable to water vapor while, at the same time, have high selectivity values. Discussion The discussion pivoted around the at-scale fabrication and implementation of membrane-based dehumidification systems. Key questions tackled the sizing of membrane systems as a function of the room size and the fan energy use necessary to move air through such large membranes. In this regard, coupling membranes with hydronic systems such as chilled radiant ceilings (mentioned in Prof. Meggers and Eduardo Gascón’s talks) would be advantageous as the air movement through ducts is minimized. Other questions tackled the lifespan and maintenance of membranes. While Prof. Warsinger does not expect the former to be a crucial issue, he did mention that appropriate maintenance is critical to ensuring the adequate performance of these systems. Finally, the group debated the differences between desiccant and membrane-based dehumidification systems – despite the increased sensible cooling required in desiccant systems, their storage ability was highlighted as an advantage in a flexible demand scenario. Fig 2.2 Diagram shared by David Warsinger of Active Membrane Energy Exchanger (AMX) in a dedicated outdoor air system (DOAS)
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