Investigating the impact of operating conditions and applying empirical models suitable for evaluating fuel cell technology
Investigating the impact of operating conditions and applying empirical models suitable for evaluating fuel cell technology
- Tez No: 617136
- Danışmanlar: DR. DUNCAN BORMAN, DR. LİN MA
- Tez Türü: Yüksek Lisans
- Konular: Çevre Mühendisliği, Metalurji Mühendisliği, Environmental Engineering, Metallurgical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2011
- Dil: İngilizce
- Üniversite: Unıversıty Of Leeds
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
Özet yok.
Özet (Çeviri)
Fuel cells have been gaining significant attention owing to their high efficiency, their potential to combat climate change through reduction in fossil fuel use, fuel flexibility and so on. This experimental study represents an overview of polymer electrolyte membrane fuel cell (PEMFC) and solid oxide fuel cell (SOFC) as well as influence of various operating conditions such as cathode/anode inlet gas flow rate and gas pressure on the performance. An empirical model is also used to characterise the behaviour of the cell at various fuel flow rates. The work forms part of a larger study to investigate the impact of various gas diffusion layer (GDL) designs and membrane electrode assembly (MEA) combinations in the performance of PEMFC. This investigation focuses in detail on a single GDL MEA combination in order to provide a detailed understanding of the PEMFC performance under a broad range of fuel flow rates and pressures. The focus is particularly made on understanding the performance of low fuel flow rates. Then these experimental data was used in the analytical model and some of the kinetic parameters of the cell were calculated using a nonlinear regression analysis. The impact of various operating conditions on SOFC performance is also presented from the literature. Consequently, higher fuel flow rate increases the cell performance. This could be linked with the combined effect of humidification and fuel flow rate since fully humidified reactants were used. An increase in the cell performance with increasing pressure was also observed. It is found that the experimental data fits excellent with modelling data at high fuel flow rate. Conversely, there are some differences for low fuel flow rates where the effect of concentration losses becomes dominant. The parameters which have an impact on the concentration losses are observed. It is found that the parameter n has greater effect on the mass transport limitation than the parameter of m.
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