Pressure losses at dividing and combining junctions in a molten carbonate fuel cell stack

The pressure losses at manifold junctions in a molten carbonate fuel cell ( MCFC) stack depend on the stacking positions of the cells and the flow rate in the manifold. These pressure losses affect the uniformity of gas flow r ate in each stacked cell and consequently also affect the cell performance. In this study, the pressure losses at dividing and combining junctions in a plate heat-exchanger type MCFC stack were examined by numerical analysis. A stack consisting of 100 cells was assumed, and the junction pressure los ses at various stacking positions of cells were calculated under various fl ow rate conditions ranging from the minimum possible flow rate (80% utiliza tion of fuel gas) to the maximum possible flow rate (10% utilization of oxi dant gas). The results were arranged according to the equations for loss co efficients, and were compared with the experimental results of previous stu dies. (C) 2001 Elsevier Science B.V. All rights reserved.