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Title: Performance of a Cross-Flow Humidifier with a High Flux Water Vapor Transport Membrane

Abstract

Water vapor transport (WVT) flux across a composite membrane that consists of a very thin perfluorosulfonic acid (PFSA) ionomer layer sandwiched between two expanded polytetrafluoroethylene (PTFE) microporous layers is investigated. Static and dynamic tests are conducted to measure WVT flux for different composite structures; a transport model shows that the underlying individual resistances for water diffusion in the gas phase and microporous and ionomer layers and for interfacial kinetics of water uptake at the ionomer surface are equally important under different conditions. A finite-difference model is formulated to determine water transport in a full-scale (2-m2 active membrane area) planar cross-flow humidifier module assembled using pleats of the optimized composite membrane. In agreement with the experimental data, the modeled WVT flux in the module increases at higher inlet relative humidity (RH) of the wet stream and at lower pressures, but the mass transfer effectiveness is higher at higher pressures. The model indicates that the WVT flux is highest under conditions that maintain the wet stream at close to 100% RH while preventing the dry stream from becoming saturated. The overall water transport is determined by the gradient in RH of the wet and dry streams but is also affected by vapormore » diffusion in the gas layer and the microporous layer.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Fuel Cell Technologies (FCTO)
OSTI Identifier:
1251619
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Journal of Power Sources
Additional Journal Information:
Journal Volume: 291; Journal ID: ISSN 0378-7753
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
Polymer electrolyte fuel cells; combined thermal and mass transfer; composite membrane; membrane humidifier; water vapor transport

Citation Formats

Ahluwalia, R. K., Wang, X., Johnson, W. B., Berg, F., and Kadylak, D. Performance of a Cross-Flow Humidifier with a High Flux Water Vapor Transport Membrane. United States: N. p., 2015. Web. doi:10.1016/j.jpowsour.2015.05.013.
Ahluwalia, R. K., Wang, X., Johnson, W. B., Berg, F., & Kadylak, D. Performance of a Cross-Flow Humidifier with a High Flux Water Vapor Transport Membrane. United States. doi:10.1016/j.jpowsour.2015.05.013.
Ahluwalia, R. K., Wang, X., Johnson, W. B., Berg, F., and Kadylak, D. Wed . "Performance of a Cross-Flow Humidifier with a High Flux Water Vapor Transport Membrane". United States. doi:10.1016/j.jpowsour.2015.05.013.
@article{osti_1251619,
title = {Performance of a Cross-Flow Humidifier with a High Flux Water Vapor Transport Membrane},
author = {Ahluwalia, R. K. and Wang, X. and Johnson, W. B. and Berg, F. and Kadylak, D.},
abstractNote = {Water vapor transport (WVT) flux across a composite membrane that consists of a very thin perfluorosulfonic acid (PFSA) ionomer layer sandwiched between two expanded polytetrafluoroethylene (PTFE) microporous layers is investigated. Static and dynamic tests are conducted to measure WVT flux for different composite structures; a transport model shows that the underlying individual resistances for water diffusion in the gas phase and microporous and ionomer layers and for interfacial kinetics of water uptake at the ionomer surface are equally important under different conditions. A finite-difference model is formulated to determine water transport in a full-scale (2-m2 active membrane area) planar cross-flow humidifier module assembled using pleats of the optimized composite membrane. In agreement with the experimental data, the modeled WVT flux in the module increases at higher inlet relative humidity (RH) of the wet stream and at lower pressures, but the mass transfer effectiveness is higher at higher pressures. The model indicates that the WVT flux is highest under conditions that maintain the wet stream at close to 100% RH while preventing the dry stream from becoming saturated. The overall water transport is determined by the gradient in RH of the wet and dry streams but is also affected by vapor diffusion in the gas layer and the microporous layer.},
doi = {10.1016/j.jpowsour.2015.05.013},
journal = {Journal of Power Sources},
issn = {0378-7753},
number = ,
volume = 291,
place = {United States},
year = {2015},
month = {9}
}