A polarization curve at various temperatures from a

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Unformatted text preview: hown in Figures 7.7 and 7.3, respectively. In this bundle, rows of tubes are connected parallel, and columns in series. In contrast to a completely series stack commonly u 8 in PEFCs, this seriesparallel arrangement is highly useful for system service durabi In this configuration, individual cells can suffer catastrophic damage, and the stack d not have to go offline, since the current is redistributed through other cells in parallel al from [16].) One drawback of this type of tubular design is the more complex and lim of cell fabrication methods. Another drawback is high internal ohmic losses the C. (Adapted from Ref. [16].) Figure 7.4 Performance of anode-supported planar SOFC at 800planar design, due to the relatively long in-plane path that electrons must tr the electrodes to and from the cell interconnect. Some of these additional ionic losses have been reduced by use of a flattened tubular SOFC design with in seals needed for the planar SOFC design are eliminated. Tubular designs have been tested in for current flow, with little 100-kWe atmospheric pressure and 250-kWe pressurized demonstration systems...
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