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The effects of coolant channels on Large-scale Polymer Electrolyte Fuel Cells (PEFCs)
Hyunchul Ju,Chao-Yang Wang,Wenbin Gu 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Fully coupled simulations of two-phase transport in PEFC and heat transfer in coolant channels is performed, in order to investigate the effects of cooling channel configuration on the distributions of temperature and water within PEFCs. When the practical coolant flow rate is applied to large-scale cells for automotive applications, significant coolant temperature rise is expected from the coolant inlet to outlet, particularly under the high current density operation, creating the significant cell temperature gradient along the flow direction as well. Consequently, two-phase water profile resulting from evaporation¬condensation processes inside PEFCs is also strongly influenced by cell temperature gradient from the hot coolant inlet toward cold coolant outlet regions, demonstrating that both temperature and liquid saturation strongly depend on the thermal gradient along the coolant flow path.