20.500.12556/RUL-116570 Analiza življenjskih ciklov vodikovih tehnologij v prihodnji energijski oskrbi Life cycle assessment of hydrogen technologies within future energy supply V doktorskem delu smo obravnavali celostne masne, energijske in okoljske vplive v fazi uporabe nizkotemperaturnih gorivnih celic s protonsko izmenjevalno membrano (NT PEMFC). V ta namen smo raziskali mehanizme degradacije komponent membransko elektrodnega sklopa in izvedli ciljne pospešene degradacijske teste. Iz rezultatov meritev smo določili semi-empirični model obratovanja NT PEMFC in izdelali matematični model degradacije energijskih pretvorb sistema NT PEMFC v trajnostni dobi, ki upošteva degradacijo energijskega izkoristka NT PEMFC in pogostejšo menjavo sklada gorivnih celic. Tega smo implementirali v nov, inovativen LCA model NT PEMFC sistema, ki je splošno uporaben za potrebe analize življenjskega cikla vodikovih tehnologij z NT PEMFC. Posodobljen inventar življenjskih ciklov (LCI) smo primerjali z LCI v obstoječih študijah in dokazali, da imajo degradacijski procesi pomemben posreden vpliv na celostne okoljske bilance in jih je zato potrebno upoštevati pri vrednotenjih vodikovih tehnologij v prihodnji energijski oskrbi. In this dissertation mass, energy, and environmental influences of the low temperature proton exchange membrane fuel cells (LT PEMFC) in its operation phase was studied. We performed targeted accelerated degradation tests in order to establish the degradation mechanisms of the components in the membrane electrode assembly. Based on the obtained results we designed semi-empirical model for the NT PEMFC operation phase and developed a mathematical model for the degradation of LT PEMFC in an operational lifetime, taking into account the degradation of LT PEMFC energy efficiency and maintenance, with more frequent replacement of the fuel cell stack. The latter was implemented into new, innovative LCA model of the NT PEMFC system, which is generally useful for life cycle assessment (LCA) analysis of hydrogen technologies with LT PEMFC. We compared the new, updated Life Cycle Inventory (LCI) with existing LCI from other studies and demonstrated that degradation processes have a significant indirect impact on integrated environmental balances and should be taken into account in evaluations of hydrogen technologies in future energy supply. analiza življenjskih ciklov inventar življenjskega cikla NT PEM gorivna celica vodikove tehnologije degradacijski procesi life cycle assessment life cycle inventory LT PEM fuel cell hydrogen technologies degradation processes true false false [R. Stropnik] Slovenski jezik Angleški jezik Doktorsko delo/naloga 2020-05-28 08:30:24 2020-05-28 08:30:30 2023-10-24 12:45:19 0000-00-00 00:00:00 2020 0 Ljubljana 0 XXVI, 151 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.9:661.96:621.352.6(043.3) 220127 17452291 5062.pdf 5062.pdf 1 F07EEF39C5FF725040FE0DB1EF0B7E66 5db58181c8acc268b043e2566f20ca0ea35655c719277ecd7fbc49615b663d28 f76b5e0b-a1b8-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=130195 Fakulteta za strojništvo 0 0 0