Parametrična občutljivostna analiza in modelsko osnovan optimalen dizajn eksperimentov analitičnega modela impedance gorivne celice s protonsko izmenjevalno membrano

magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo

Tit Voglar (Author), Tomaž Katrašnik (Mentor)

Abstract

Elektrokemična impedančna spektroskopija (EIS) je izjemno uporabno orodje za in situ meritve in modeliranje gorivnih celic (GC). Navkljub raziskovalnim naporom na področju EIS modeliranja velik izziv pri uporabi metode povzroča interpretacija merilnih rezultatov, saj fizikalnokemijsko konsistentni modeli, ki uporabljajo parametre s fizikalnim pomenom še niso razviti v dovoljšni meri. Z namenom pospešitve razvoja na tem področju je v delu opisana implementacija fizikalno konsistentnega analitičnega modela v frekvenčni domeni, ki je veljaven za vse gostote električnega toka in obravnava anodo in katodo GC. Razvit model smo inovativno sklopili z modelom v časovni domeni, ki izkazuje zelo dobre napovedne lastnosti. Sklopitev daje kvalitetnejše informacije o intrinzičnih parametrih GC, kot bi jih lahko pridobili zgolj v posamezni domeni. Model smo verificirali in validirali, preverili možno redukcijo modela in izvedli optimalni dizajn eksperimentov (DoE) z analizo frekvenčne občutljivosti kalibracijskih parametrov in vplivnosti obratovalnih pogojev. Rezultati kažejo, da ima model dobro sposobnost kalibracije na eksperimentalne podatke, vrednost R-kvadrat je namreč vedno večja od 0,965, model ima tudi dobre ekstrapolacijske lastnosti. Z DoE smo pokazali, da je z majhnim številom dobro nastavljenih eksperimentov možno bistveno izboljšati pridobljeno informacijo o kalibracijskih parametrih. Poleg tega predlagano metodologijo uporabimo z namenom zmanjšanja potrebnega števila meritev impedančnih spektrov za doseganje zadostne informacije o posameznih kalibracijskih parametrih.

Keywords

magistrske naloge;gorivna celica;protonska izmenjalna membrana;elektroimpedančna spektroskopija;računsko hitri modeli;modeli z znižano dimenzionalnostjo;virtualna tipala;optimalni dizajn eksperimentov;modelsko-osnovan dizajn eksperimentov;občutljivostna analiz;

Data

Language:	Slovenian
Year of publishing:	2021
Typology:	2.09 - Master's Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[T. Voglar]
UDC:	621.352.6:543.428(043.2)
COBISS:	78782211
Views:	489
Downloads:	1
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Parameter sensitivity analysis and model-based design of experiments of the analytical model for impedance of the proton exchange membrane fuel cell
Secondary abstract:	Electrochemical impedance spectroscopy (EIS) is an extremely important tool for in-situ measurements and modelling of fuel cells (FC). Despite long research efforts in the field of EIS modelling, the interpretation of experimental data remains a challenge as physicochemically consistent models, which use parameters with a clearly defined physical meaning, have no yet to be fully developed. With the purpose of accellerating the developement in this field, in this thesis an implementation of such a physically consistent model is described. The model is valid for all current densities and takes into account the cathode and the anode side of the FC. The developed model was interconnected with a time domain model with state-of-the-art extrapolation capabillities. The model was verified and validated, reduced versions of the model were tested for accuracy and optimal design of experiments (DoE) was conducted. In addition, an analysis of sensitivity of calibration parameters with respect to frequency was conducted and the influence of each seperate operational condition was asessed. The results show a high accuracy of fit as the R-squared parameter never falls below 0.965. The model also shows good extrapolation capabilities. DoE has shown that experiments with fewer measurements can yield much higher information of calibration parameters if they are meticulously planned. This proposed methodology is used with the aim of reducing the number of required measurements of impedance spectra for acquiring a sufficient ammount of information about individual calibration parameters.
Secondary keywords:	master thesis;fuel cell;proton exchange membrane;electrochemical impedance spectroscopy;computationaly fast models;reduced dimensionality models;virtual observers;optimal design of experiments;model-based design of experiments;sensitivity analysis;
Type (COBISS):	Master's thesis/paper
Study programme:	0
Embargo end date (OpenAIRE):	2023-09-01
Thesis comment:	Univ. Ljubljana, Fak. za strojništvo
Pages:	XXIV, 70, [1] str.
ID:	13363319