Thermodynamically based reduced dimensionality proton exchange membrane fuel cell model for observer based monitoring and control

dostoral thesis

Andraž Kravos (Author), Tomaž Katrašnik (Mentor), Christoph Hametner (Co-mentor)

Abstract

This doctoral thesis focuses on modeling and predicting fuel cell performance and degradation. Firstly, a reduced dimensionality model is developed, improving predictability in low current density regions and allowing for efficient determination of fuel cell intrinsic parameters, which can with developed model-based design of experiments methodology be efficiently determined with reduced experimental effort. Furthermore, novel mechanistic-based liquid water model is developed, that addresses critical aspects such as flooding, phase change, and two-phase transport in all fuel cell regions. When applied to the existing and newly developed 1D+1D system-level model, it provides a comprehensive understanding of liquid water dynamics, particularly in channels, catalyst, and gas diffusion layers. With real-time readiness and excellent agreement with experimental data, this model demonstrates its applicability in practical scenarios. Additionally, an integrated modelling framework considers causal chain of intertwined degradation mechanisms, providing comprehensive predictions for fuel cell degradation by addressing membrane aging, catalyst layer degradation, platinum migration, and peroxide formation, this framework enhances the understanding of degradation processes. Lastly developed modelling frameworks is used to develop distributed parameter model-based observer algorithm that makes possible, for the first time, to identify spatially resolved two-phase internal states of the fuel cell based only on adequate voltage and current traces.

Keywords

proton exchange membrane;fuel cells;thermodynamical models;liquid water modeling;optimal design;degradation;

Data

Language:	English
Year of publishing:	2023
Typology:	2.08 - Doctoral Dissertation
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[A. Kravos]
UDC:	621.352.6:004.942:532.5(043.3)
COBISS:	168972035
Views:	834
Downloads:	0
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary title:	Termodinamsko osnovan model gorivnih celic s protonsko izmenjevalno membrano z znižano dimenzionalnostjo za opazovanje in nadzor z virtualnimi tipali
Secondary abstract:	Doktorsko delo obravnava modeliranje in napovedovanje delovanja in degradacije gorivnih celic (GC). V njem je predstavljen razvoj modela z zmanjšano dimenzionalnostjo, ki izboljša napovednost v območjih z nizko gostoto toka in omogoča učinkovito določanje intrinzičnih parametrov GC, ki jih je mogoče z razvito metodologijo modelsko osnovanega načrtovanja eksperimentov učinkovito določiti z zmanjšanim eksperimentalnim naporom. Dodatno je bil razvit nov mehanistično osnovan model tekoče vode, ki obravnava kritične pojave, kot so poplavljanje, sprememba faze in dvofazni transport v vseh domenah GC. Zaradi svoje modelske osnove se lahko uporablja tako z obstoječimi modeli kot tudi z novo razvitim sistemskim 1D+1D modelom in omogoča celovito razumevanje dinamike tekoče vode, zlasti v kanalih, katalizatorju in plasteh za difuzijo plinov. Z odličnim ujemanjem z eksperimentalnimi podatki in z zmožnostjo izračunavanja hitreje od realnega časa, model dokazuje svojo uporabnost v praktičnih aplikacijah. Dodatno je bil implementiran tudi modelski okvir, ki upošteva vzročno verigo prepletenih degradacijskih mehanizmov in zagotavlja celovite napovedi z obravnavo staranja membrane, degradacije plasti katalizatorja, migracije platine in nastajanja vodikovega peroksida ter tako omogoča poglobljen uvid v degradacijo GC. Razviti modelski okviri so bili nazadnje uporabljeni za razvoj prostorsko razločenega virtualnega tipala, ki prvič omogoča identifikacijo prostorsko razločenih dvofaznih notranjih stanj GC samo na podlagi ustreznih signalov napetosti in toka.
Secondary keywords:	disertacije;gorivne celice;protonska izmenjevalna membrana;termodinamski modeli;modeliranje tekoče vode;optimalni dizajn;degradacijski pojavi;Gorivne celice;Disertacije;Modeliranje;
Type (COBISS):	Doctoral dissertation
Study programme:	0
Embargo end date (OpenAIRE):	2025-10-13
Thesis comment:	Univ. v Ljubljani, Fak. za strojništvo
Pages:	XXV, 324 str.
ID:	20253387