E and are calculated using single cell performance model <4). 650 °C is assumed as the representative stack temperature in the calculation. In addition, R,r observed at approximately 600 °C is compensared using the representative temperature. Temperature in the stack is actually not uniform. However, Ra + Rc of each cell of the stack is able to be calculated with good accuracy since E - TJne - jRlr in Eq. (1) is changed only within 10 mV by temperature change of 70 °C since increment of temperature increases E - r/NE but decreases jRir. R, is approximately constant if the fuel gas is reformed LNG(s). Furthermore, Rc is given by following equation, even if cathode gas composition is changed, since cathode polarization is controlled by super oxide ion and C02 diffusion<5).

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