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73 Thermoelectric power generation In solid oxide fuel cells another method called thermoelectric can be used as waste heat recovery option. This technology can bring down the cost of produced electricity to about 400$/KW which is an interesting amount and well close to targets for fuel cell technology. The efficiency of system can be over 60% in this configuration. The system is low maintenance, has low noise level and is a modular option to be combined with Solid Oxide fuel cells with 400‐800°C waste heat. This system is so cost effective and coal can be used as a fuel for this system in a rather clean way. 37 74 Fuel reforming by waste heat Polymer electrolyte membrane fuel cells (PEMFC) have been recently well developed and are so interesting for transportation applications. It is hard to prepare hydrogen which is their main fuel. One method is to utilize waste heat of Solid Oxide fuel cells to reform some fuels to be used in PEMFC. A layout of system has been shown in Figure 19. As depicted in the figure, waste heat of solid oxide fuel cell will be used in shifter in present of a catalyst to produce H2 from added water and O2 to SOFC exhaust gasses. This produced H2 can be used in PEMFC for producing extra amount of electricity. Even after PEMFC, small fraction of waste heat will generate some amount of steam for further use (Wamei Lin,2010). Figure 19: Waste heat recovery from Solid Oxide fuel cell to reform fuel for Polymer electrolyte membrane fuel cells. Source: Infoscience38 [7] 37 Jifeng Zhang and Jean Yamanis; available at: http://www.netl.doe.gov/technologies/coalpower/fuelcells/seca/projects/adv_research/V.11%20Techno‐ Economic%20Feasibility%20of%20Highly.pdf; as access: 14.06.2010. 38 Source: Wamei Lin, Waste heat recovery system for fuel cell system, Fuel Cell Technology 2009; TRRF05 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. 43PDF Image | Exergy
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