Total Heat Generation in a Fuel Cell

Combining Equations 4.93a and 4.95, the total heat generation per cell is given as 

For ( )f = 1, that is, all fuel moles going through electrochemical reaction, the equation reduces to 

Another simple form of heat generation term can be estimated on the basis 

For a total fuel cell power of P, the total heat generation rate is given as 

Equation 4.100 is also equivalent to the heat generation on the basis of the assumption that net heat generation is due to the difference between the maximum possible cell voltage based on the enthalpy of reaction and the operating voltage. 

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