Search for dissertations about: "Fuel cell systems"

Showing result 1 - 5 of 102 swedish dissertations containing the words Fuel cell systems.

2. 1. Bringing fuel cells to reality and reality to fuel cells : A systems perspective on the use of fuel cells

   Author : Maria Saxe; Per Alvfors; Angelo Moreno; KTH; []
   Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Assessment; CUTE; Demonstration projects; Emerging technology; Evaluation; Fuel cell buses; Fuel cell systems; Fuel cells; Hype; Interdisciplinary; Niche markets; PEM; Radical technologies; SOFC; Strategic niche markets; Sustainability; Chemical energy engineering; Kemisk energiteknik;

   Abstract : With growing awareness of global warming and fear of political instability caused by oil depletion, the need for a society with a sustainable energy system has been brought to the fore. A promising technology often mentioned as a key component in such a system is the fuel cell technology, i.e. READ MORE

4. 2. On direct hydrogen fuel cell vehicles : modelling and demonstration

   Author : Kristina Haraldsson; Per Alvfors; Dougal J. Nelson; KTH; []
   Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Chemical engineering; direct hydrogen; Proton Exchange Membrane; PEM; fuel cell; fuel cell vehicle; fuel cell hybrid vehicles; on-board hydrogen storage; Kemiteknik; Chemical engineering; Kemiteknik;

   Abstract : In this thesis, direct hydrogen Proton Exchange Membrane (PEM) fuel cell systems in vehicles are investigated through modelling, field tests and public acceptance surveys. A computer model of a 50 kW PEM fuel cell system was developed. The fuel cell system efficiency is approximately 50% between 10 and 45% of the rated power. READ MORE

5. 3. Fuel Cells and Biogas

   Author : Lars Hedström; Per Alvfors; Peter Lund; KTH; []
   Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; air bleed; biogas; carbon dioxide; carbon monoxide; current distribution; dilution; efficiency; energy conversion; energy systems; experimental; fuel cell; fuel cell systems; PEFC; poisoning; reformate; SOFC; Chemical energy engineering; Kemisk energiteknik;

   Abstract : This thesis concerns biogas-operated fuel cells. Fuel cell technology may contribute to more efficient energy use, reduce emissions and also perhaps revolutionize current energy systems. The technology is, however, still immature and has not yet been implemented as dominant in any application or niche market. READ MORE

6. 4. Economic Aspects of Fuel Cell-Based Stationary Energy Systems

   Author : Suat Sevencan; Göran Lindbergh; Lechtenböhmer Stefan; KTH; []
   Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fuel cells; niche market; stationary applications; feasibility; multi-generation; Chemical Engineering; Kemiteknik;

   Abstract : It is evident that human activity has an important impact on climate. Constantly increasing energy demand is one of the biggest causes of climate change. The fifth assessment report of the Inter-governmental panel on climate change states that decarbonisation of electricity generation is a key component of climate change mitigation. READ MORE

7. 5. Modelling and controlling of polymer electrolyte fuel cell systems

   Author : Yuanxin Qi; Värmeöverföring; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ENGINEERING AND TECHNOLOGY;

   Abstract : This thesis focuses on the modelling and controlling of polymer electrolyte fuelcell (PEFC) systems. A system level dynamic PEFC model has been developedto test the system performance (output voltage, reactants gas partial pressures,and stack temperature) for different operating conditions. READ MORE