{"id":307017,"date":"2023-09-15T18:48:38","date_gmt":"2023-09-15T18:48:38","guid":{"rendered":"\/forum\/forums\/topic\/soec-solid-oxide-electrolyser-cell-some-questions-in-simulations\/"},"modified":"2023-09-15T18:48:38","modified_gmt":"2023-09-15T18:48:38","slug":"soec-solid-oxide-electrolyser-cell-some-questions-in-simulations","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/soec-solid-oxide-electrolyser-cell-some-questions-in-simulations\/","title":{"rendered":"SOEC (Solid Oxide Electrolyser Cell) – Some questions in Simulations"},"content":{"rendered":"

Hello everyone!<\/p>\n

I am trying to simulate a planar SOEC (Solid Oxide Electrolyser Cell) where the inlet is H2O, to produce H2 (cathode) and O2 (anode) at 800ºC (1073K). I am using the Fuel Cell and Electrolysis module, and defining it for Electrolysis. I am using ANSYS 2022.<\/p>\n

The layers I am using are, from top to bottom (and represented on the figure).
– Cathode Interconnector
– Cathode Channel (defined by the gap in the cathode interconnector)
– Cathode Gas Diffusion Layer
– Cathode Active Layer
– Electrolyte
– Anode Active Layer
– Anode Gas Diffusion Layer
– Anode Channel (defined by the gap in the anode interconnector)
– Anode Interconnector<\/p>\n

It is a simple geometry, 20x20cm, with straight channels. The channels are flowing in cross flow, so the direction of the anode channel is perpendicular to the direction of the cathode channel.<\/p>\n

I have not defined my own source terms, but instead, and according to the ANSYS Guide, I have selected where each one of them takes place (in which area) and I expect those terms to change accordingly for an Electrolyser.<\/p>\n

Also, the voltage I am defining it with values of +1.3V for the tab in the Anode, and 0V for the tab in the Cathode, the upper and the bottom parts of the interconnectors, defining like that the voltage difference. I’ve set the OCV Voltage to +0.84V.<\/p>\n

Nevertheless, when I run the simulation, and even though it successfuly generates H2 and O2, I get very high values for the Current density (A\/m2) in areas where it should be low. I am trying to replicate and compare with the following article: http:\/\/dx.doi.org\/10.1016\/j.apenergy.2014.04.104<\/p>\n

The current should have a different profile. Attached you can find the image, comparing at left the article results and on the right my results. Also, my values are clearly different.<\/p>\n

– Am I considering right the signs on the source terms? Should I edit something for the electrolysis mode in this Module?
– I am sure there has to be a problem with the sign of the values (+\/-) somewhere. Anyone has any clue?
– Are there any boundary condition I haven’t set up?<\/p>\n

Also, the quantity of H2 and O2 produced ans the Temperature are very much dependent on the Initial conditions for simulating… Making the results not very trustable.<\/p>\n

I am 3 weeks away of presenting my thesis and a small help in this matter would mean so much to me. I could also menction that help on my thesis \ud83d\ude42<\/p>\n

Thank you so much! And cheers from Spain.
Raúl\"\"<\/p>\n

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