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12 [Mills, 1995]. 188 E-4 [m2 /s]] [Mills, 1995] T0 is 300 [K] P0 is 1 [bar] The subscribe 0 means the parameter is taking in a working point. 12) 50 CHAPTER 9. 5 [bar]. The diffusion of oxygen through the GDL layer is approximated to diffusion of oxygen into air through a porous solid. , 2000]. 13 has been widely used to correct the binary diffusion coefficient to the effective coefficient that describes the diffusion through the GDL layer. 13) where is a constant The value of depends of the structure of the GDL layer.

21) The time constant of the fuel cell τf c is much larger than the time constants in the DC-DC converter which means the dynamics of the fuel cell will dominate the system. However the size of the capacitor is uncertain and may be small and thereby making τf c smaller. 2. 7: The simplified circuit that is implemented in Simulink c . 7 the simplified model that is implemented in Simulink is shown, where the switch is substituted with a transformer and a resistance that accounts for the losses in the system.

The governing equations of the system components are linearized and a linear model is derived to be able to analyze the air side system. 2.

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