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72 ORC as bottoming cycle of Solid oxide fuel cell In Molten Carbonate Fuel Cells, large amount of heat is generated. Sensible heat from this waste heat can only potentially produce 25% more electricity. The amount of this waste heat is more than 30% of input energy. Even more amount of waste heat is available for Solid Oxide fuel cells. Exploring some bottoming cycles, it is known that steam cycles are only economically viable at large scales. An alternative would be ORC. By applying ORC, as an example, Solid Oxide fuel cell total efficiency will increase by amount of about 15%. Even a single effect absorption chiller can be connected to Solid Oxide fuel cell and ORC while the waste heat of ORC is used for heating purposes and the rest for driving the chillers. This will help in another 20 percent increase while heat, cooling and electricity are produced (Fahad A. Al‐Sulaimana, Ibrahim Dincerb, Feridun Hamdullahpurc, 2010). In figure 18 a possible layout of the system is shown. In this figure, waste heat of SOFC which has temperatures of about 400°C will be transferred to ORC evaporator to heat the ORC fluid. Evaporated fluid will run the ORC turbine to produce extra amount of power. Efficiency of SOFC is about 60% and produced power from each SOFC unit can be about 100 KW. By adding ORC, more power and better efficiencies will be achieved. Waste heat of ORC condenser can be used in absorber chiller to produce cooling and add to total system efficiency as well (Fahad A. Al‐Sulaimana, Ibrahim Dincerb, Feridun Hamdullahpurc, 2010). 36 N. Autissier, F. Palazzi, F. Marechal, J. van Herle, D. Favrat; available at: http://infoscience.epfl.ch/record/87988/files/Autissier_FCT000123.pdf; as accessed: 12.06.2010. 41PDF Image | Exergy
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