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Influence of the rated power in the performance of different proton exchange membrane (PEM) fuel cells
San Martin, J.I.; Zamora, I.; San Martin, J.J.; … - In: Energy 35 (2010) 5, pp. 1898-1907
Fuel cells are clean generators that provide both electrical and thermal energy with a high global efficiency level. The characteristics of these devices depend on numerous parameters such as: temperature, fuel and oxidizer pressures, fuel and oxidizer flows, etc. Therefore, their influence...
Persistent link: https://www.econbiz.de/10010808744
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T–S diagram efficiency analysis of two-step thermochemical cycles for solar water splitting under various process conditions
Lange, M.; Roeb, M.; Sattler, C.; Pitz-Paal, R. - In: Energy 67 (2014) C, pp. 298-308
Temperature–entropy diagrams combined with a pinch point analysis are introduced, providing a vivid and detailed tool to analyse two-step thermochemical water-splitting processes. The impacts of different temperature and pressure conditions, as well as different water conversion rates, are...
Persistent link: https://www.econbiz.de/10010809679
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Energy and exergy analysis of hydrogen-oriented coal gasification with CO2 capture
Liszka, Marcin; Malik, Tomasz; Manfrida, Giampaolo - In: Energy 45 (2012) 1, pp. 142-150
Coal gasification is seen as an attractive way for hydrogen production. The main advantage of this approach is the low …, pressure-swing adsorption process for hydrogen separation, combined cycle for power production and essential auxiliary … loss takes place in the gasifier. The overall exergy efficiency of the coal-to-hydrogen system is equal to ca. 57%, while …
Persistent link: https://www.econbiz.de/10011052964