Page 31 - Introduction to Transfer Phenomena in PEM Fuel Cells

20 Introduction to Transfer Phenomena in PEM Fuel Cells
main application of these batteries is cogeneration; the power range of PAFC
batteries is between 200 kW and 50 MW [BLU 07].

Figure 1.8. Operating principle of a PAFC

1.2.1.4.1. Operational characteristics

Table 1.5 summarizes the operational characteristics and performance of
a PAFC [BOU 07].

Characteristics and performance
Operating temperature ~ 200°C
Operating pressure Atmospheric pressure or up to 8 bars
Electrical efficiency 40 to 55%
Actual voltage 0.6 to 0.8 V
Current density Up to 800 m A/cm²
Start-up time 1 to 3 hours
Response time to a rapid variation in demand Very fast
Lifetime > 40,000 hours (value in 2005)

Table 1.5. Characteristics and performance of a PAFC