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PEM Fuel Cells, 2nd Edition by Frano Barbir

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Chapter Five

Fuel Cell Operating Conditions

Fuel cell operating conditions include:

• Pressure

• Temperature

• Flow rates of reactant gases

• Humidity of reactant gases

Typical PEM fuel cell operating conditions are listed in Table 5-1. It should be mentioned that the values listed in Table 5-1 do not represent rigid boundaries but rather the typical values.

Table 5-1 Typical PEM Fuel Cell Operating Conditions

H2/air: Ambient to 400 kPa
Pressure H2/O2: up to 1,200 kPa
Temperature 50°C to 80°C
Flow rates H2: 1 to 1.2
O2: 1.2 to 1.5
Air: 2 to 2.5
Humidity of reactants H2: 0 to 125%
O2/Air: 0 to 100%

These parameters are discussed in the following sections.

5.1 Operating Pressure

A fuel cell may be operated at ambient pressure or it may ...

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