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Some water will be added in reformation process; hence this will help in producing more H2. Normally hydrogen comes from fuel and here from water as well. The combine system has 20% less cost than Solid Oxide fuel cell and 30% less cost than PEMFCs. The efficiency of PEMFC will also be improved from about 40% to 60%. 75 Cogeneration arrangement of fuel cell Using low temperature waste heat of some fuel cells same as Phosphoric Acid Fuel Cells can be used for heating purposes. This waste heat is not appropriate for gas turbine or ORC applications to produce power. To sum up, depending on fuel cell technology waste heat recovery system can be opted. In case of Solid Oxide fuel cell gas turbine or micro gas turbine can be added as bottoming cycle. If PEMFCs are interested Solid Oxide fuel cell waste heat can be used to reform fuel for them. Cost effective Thermo electric systems or Trigeneration plant based on ORC and Solid Oxide fuel cells can also be considered. This will help to get high efficiencies and to produce electricity, heat and cooling simultaneously. This is while that, in case of Molten Oxide fuel cells ORC is very interesting option. Low temperature fuel cells waste heat can only be used to meet cooling or heat demand. Cost of added technology is normally less than the fuel cell itself and efficiency will be improved by this extra system. This is true for fuel cell based ORCs as an option. Aforementioned conclusion is summarized in Table: MOFC ORC 2500$/kW ORC PEMFC No significant heat ‐ ‐ recovery option Table 5: Heat recovery options from fuel cells Fuel cell type Heat recovery options Estimated cost of produced electricity after heat recovery Best recommended option SOFC Gas turbine, ORC, TE as bottoming cycle, Reforming fuel for PEMFC Claimed to be about 400$/kW Thermal electric or Trigeneration system based on ORC 44PDF Image | Exergy
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