The handbook on fuel cell performance explains how different types of fuel cells work and how they perform under various conditions. It helps fuel cell engineers choose the best fuel processing methods for different types of fuel cells and predict their performance. The focus is on phosphoric acid and molten carbonate fuel cells, which are closer to being used commercially. The handbook discusses how factors like temperature, pressure, fuel conversion, and oxidant utilization affect fuel cell performance. It also looks at how different fuels and oxidants impact fuel cell efficiency. Overall, the handbook provides valuable information for using fuel cells in power generation and waste heat utilization in industrial, commercial, and residential settings.