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 .) 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. .) 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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This document was uploaded on 11/20/2013.
- Fall '13