Fuel cells represent an important source of electrical energy and their presence in the energetic and industrial sectors is estimated to increase. The high electrical efficiency, comparable with the best available conventional technologies, the fact that are "environmentally friendly" and the modular character will speed up the diffusion process and the integration in the present power systems. The Proton Exchange Membrane fuel cells (PEMFC) represent a promising technology for distributed generation. The PEMFC operate at relatively low temperatures, allowing the fast start-up and being used in the application where this requirement has to be achieved, can vary very quickly the power generated in order to achieve the power demands and uses solid polymer as electrolyte that reduces the construction, transportation and safety concerns. In this paper the dynamic model of the PEMFC is presented and simulated for evaluating the dynamic performance of these fuel cells. The model takes into consideration the constructive and operational parameters of PEMFC (flow change, reactants partial pressures, load current, loss mechanisms inside the fuel cell) for predicting the efficiency and power produced by the fuel cell.
Dynamic performance of the proton exchange membrane fuel cells
DESIDERI, UMBERTO;
2005-01-01
Abstract
Fuel cells represent an important source of electrical energy and their presence in the energetic and industrial sectors is estimated to increase. The high electrical efficiency, comparable with the best available conventional technologies, the fact that are "environmentally friendly" and the modular character will speed up the diffusion process and the integration in the present power systems. The Proton Exchange Membrane fuel cells (PEMFC) represent a promising technology for distributed generation. The PEMFC operate at relatively low temperatures, allowing the fast start-up and being used in the application where this requirement has to be achieved, can vary very quickly the power generated in order to achieve the power demands and uses solid polymer as electrolyte that reduces the construction, transportation and safety concerns. In this paper the dynamic model of the PEMFC is presented and simulated for evaluating the dynamic performance of these fuel cells. The model takes into consideration the constructive and operational parameters of PEMFC (flow change, reactants partial pressures, load current, loss mechanisms inside the fuel cell) for predicting the efficiency and power produced by the fuel cell.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
