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The coefficients in these equations were correlated from performance data for cells (45) operating at 120 psia (8.2 atm), 405 °F (207 °C) (16) with fuel and oxidant utilizations of 85 percent and 70 percent, respectively18, an air fed cathode, and an anode inlet composition of 75 percent H2, and 0.5 percent CO. Similarly, at atmospheric conditions, the magnitude of this loss can be approximated by ∆VJ (mV) = -0.74 ∆J for J= 50 to 120 mA/cm2 (5-19) ∆VJ (mV) = -0.45 ∆J for J= 120 to 215 mA/cm2 (5-20) The coefficients in the atmospheric condition equations were derived from performance data for cells (45) operating at 14.7 psia (1 atm) and 400 °F (204 °C), fuel and oxidant utilizations of 80 percent and 60 percent, respectively18, an air fed cathode, and an anode inlet composition of 75 percent H2 and 0.5 percent CO. 5.2.6 EffectsofCellLife One of the primary areas of research is in extending cell life. The goal is to maintain the performance of the cell stack during a standard utility application (~40,000 hours). Previous state-of-the-art PAFCs (46, 47, 48) showed the following degradation over time: ∆Vlifetime (mV) = -3 mV/1,000 hours (5-21) UTC Fuel Cells reports that the efficiency of its latest power plants at the beginning of life is 40 percent LHV. The infant life loss reduces the efficiency quickly to 38 percent, but then there is a small decrease in efficiency over the next 40,000 hours (expected cell life) resulting in an average efficiency over life of 37 percent (3). Assuming that the loss in efficiency is due solely to cell voltage loss, the maximum degradation rate can be determined as: ∆Vlifetime (mV) = -2 mV/1,000 hours (5-22) 18. Assumes graph operating conditions (not provided) are the same as associated text of Ref.15. 5-20PDF Image | Fuel Cell Handbook (Seventh Edition)
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