|Publication type:||Conference other|
|Type of review:||Peer review (abstract)|
|Title:||3-D simulation of heat and water transport in PEFCs during evaporative cooling and humidification|
|Conference details:||17th Symposium on Modeling and Experimental Validation of Electrochemical Energy Technologies (MODVAL 17), online, 20-22 April 2021|
|Subject (DDC):||621.3: Electrical, communications, control engineering|
|Abstract:||Evaporative cooling is a promising concept to increase the power density and reduce the complexity of polymer electrolyte fuel cell systems (PEFCs) by using gas diffusion layers (GDLs) modified with hydrophilic lines (HPL) . While this concept has been demonstrated in experiments [2-3], a quantitative understanding of evaporative cooling and humidification is missing. Here we simulate the heat and water transport processes in part of a non-operating evaporative cooling cell using a 3-D macro-homogeneous model, which consists of a mem-brane electrode assembly (MEA) with one HPL in the anode GDL, sandwiched by flow chan-nel plates. In the base case simulation, water evaporates mostly in the HPL in contact with the gas flow and, to a smaller degree, with the hydrophobic part of the GDL. Almost all of the generated water vapour leaves the cell through the anode gas channel. The resulting membrane humidification (l) varies on the anode side being the highest below the hydrophilic line and ribs and the lowest below the gas channel, and decreases towards the cathode side. Evaporating rates are partly limited by the water evaporation transfer coefficient at values typically adopted for simulating evaporation in PEFC models. In contrast, at higher transfer coefficients, evaporation rates reach a plateau and, hence, become transport limited. The next step is to simulate the increasing humidification with more hydrophilic lines, and an oper-ating cell including electro-osmotic drag.|
|Further description:||Funded by the Swiss Competence Center for Energy Research (SCCER Mobility) and the Swiss Federal Office of Energy SFOE (contract number SI/501764-01).|
|Fulltext version:||Published version|
|License (according to publishing contract):||Licence according to publishing contract|
|Departement:||School of Engineering|
|Organisational Unit:||Institute of Computational Physics (ICP)|
|Appears in collections:||Publikationen School of Engineering|
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