Abstract
This paper discusses the transient characteristics of the planar type
SOFC cell stack, of which the standard output is 300 W. The transient
response of the voltage to the manipulation of an electric current was
investigated. The effects of the response and of the operating condition
determined by the operating temperature of the stack were studied by
mapping a current-voltage (I-V) correlation. The current-based fuel
control (CBFC) was adopted for keeping the fuel utilization factor at
constant while the value of the electric current was ramped at the
constant rate. The present experimental study shows that the transient
characteristics of the cell voltage are determined by primarily the
operating temperature caused by the manipulation of the current.
Particularly, the slope of the I-V curve and the overshoot found on the
voltage was remarkably influenced by the operating temperature. The
different values of the fuel utilization factor influence the height of
the settled voltages. The CBFC has significance in determining the slope
of the I-V characteristic, but the different values of the fuel
utilization factor does not affect the slope as the operating temperature
does. The CBFC essentially does not alter the amplitude of the overshoot
on the voltage response, since this is dominated by the operating
temperature and its change is caused by manipulating the current.
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