Design Report Guided Missile Submarine SSG(X) - AOE - Virginia ...

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SSG(X) Design – VT Team 3 Page 14 Table 7 – Data for SSG(X) propulsion options Table 8 - Data for SSG(X) propulsion options (continued) The AIP fuel cell options are classified by their electrolyte. The options researched were Molten Carbonate (MCFC), Phosphoric Acid (PAFC), Polymer Electrolyte Membrane (PEM), Solid Oxide, Direct Methanol, Alkaline, and Regenerative (Reversible). The best alternative for SSG(X) was found to be the PEM cell, providing reduced signatures and safe and proven technology. Reformers were also researched, but not considered due to their immature development. PEM fuel cells have multiple advantages. They offer a quiet low temperature operating condition, thereby reducing the thermal signature. The only byproduct is clean pure water. The technology is proven and safe; therefore, PEM fuel cells are a low risk option. PEM cells are stackable, providing a range of space options. Their disadvantage is that pure Hydrogen and Oxygen reactants must be carried. Cell impurities also reduce efficiency and output. Figure 6 displays how a PEM fuel cell operates.
SSG(X) Design – VT Team 3 Page 15 Figure 6 - PEM fuel cell description [Dr. Brown, Ship Design Notes] Figure 7 - Outline of a closed cycle diesel engine [Dr. Brown, Ship Design Notes] The closed cycle diesel (CCD) option can be integrated with any diesel engine. The process for a CCD is to use an inert gas (e.g. Argon) and oxygen to provide an atmosphere for the diesel engine. Exhaust gases are separated from the argon which is recycled. Exhaust gases, are then dissolved into seawater using a Water Management System (Cosworth System), and dumped. The diesel engine can operate in an open cycle (using a snorkel) or a closed cycle (using stored oxygen) modes. Some additional efficiency is gained by using an AC generator in propulsion vice DC. The CCD system is proven technology. A diesel engine is a low cost, high power density option. A CCD is a more simplistic option needing only one system to provide both AIP and snorkeling propulsion. Some disadvantages of the CCD are noise associated with the moving parts and high volume density. The system also requires the COSWORTH system to function and is affected by any contamination of gases. Figure 7 is a schematic of how a CCD system works.
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Design Report Guided Missile Submarine SSG(X) - AOE - Virginia ...

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