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These water adsorption isotherms were then used to develop a model for the diffusion coefficient based on the membrane’s permeability by Ye and LeVan,9 in which a three resistance model was considered. Most of the research concerning Nafion⃝R membranes has been focused on their use as thin sheets in PEFCs. However, the investigation of water transport properties done by Ye and LeVan9 used the material in a concentric tube arrangement operating in a counter-current fashion consisting of a single tube. They were able to develop concentration profiles along the length of the membrane for flow rates ranging from 2 to 10 slpm. In a second paper, Ye and LeVan10 characterized a shell and tube membrane module containing 50 tubes, in which they determined that not only does membrane thickness have a significant impact in determining the mass transfer resistances, but skin resistances do as well. Recently, Nafion⃝R membranes have interested NASA for use in dehydrating gas streams as a pretreatment for air revitalization. Since the majority of energy used in revitalizing the cabin air is involved in removing the water, utilizing a membrane could greatly reduce the energy requirements of air revitalization as predicted by Ye and LeVan.9 For manned-space flight, it is typically desired to recuperate the water removed from the feed stream in the purge. However, in certain circumstances it is more important to reduce the mass and power consumption of the process than it is to recycle the water, such as in air revitalization systems proposed for NASA’s crew exploration vehicle (CEV). In this case, replacing the purge gas on the shell side of the membrane with a vacuum could conserve the drying performance of the membrane module. The scope of this work is to investigate the drying performance of a multi-tube Nafion⃝R membrane module housed in a shell and operated with a vacuum on the purge side. We are interested in the integrity of the membrane and transport rates of water through the membrane with flow through the tubes and a vacuum applied 75PDF Image | TEMPERATURE SWING ADSORPTION COMPRESSION AND MEMBRANE SEPARATIONS
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