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POWER DENSITY OF FUEL CELLS 250 200 150 100 50 0 0.000 0.500 1.000 1.500 VOLUME (m3) MODULES SYSTEMS Linear (MODULES) Linear (SYSTEMS) y = 124.7x + 29.281 y = 55.944x + 73.331 2.000 Figure 2.5 Power Density: Based off values from Table 2.1 and Table 2.2 In order to create the most accurate prediction of possible FC systems, the volume and mass numbers used in the study will be for the entire system. Accordingly, Equation 2.7 and Equation 2.8 below present the equations taken from the red (systems) trend lines in Figure 2.4 and Figure 2.5. Power [kW] = 0.1237 * mass [kg]3 + 61.868 Power [kW] = 55.944 * volume [m ] + 73.331 2.1.5. Hydrogen Fuel Storage for Fuel Cells Two ways to store hydrogen fuel are considered in this work, as a high pressure gas at 5,000 psi (350 bar) and as a cryogenic liquid at about 20 K or -252 degrees C. High pressure hydrogen gas is considered because it is easier to manufacture and more widely available than liquid hydrogen (LH2). However, LH2 can be transported in much larger quantities and will result in a smaller and lighter overall system on a ship compared to a gaseous storage system. In both cases, the mass and volume of the entire storage container system must be determined, not just that of the hydrogen alone. Therefore calculations that will estimate the mass and volume of the fuel containers will use two sets of different “factors,” one for LH2 storage and one for 5000 psi hydrogen. The factors used in this study are given in Table 2.3 below. The specs for the 5,000 psi system are based on an existing commercially-packaged array of 8 tanks from Luxfer-GTM and total capacity of about 60 kg. While configurations can vary widely, this product is a good representation on what to expect from a tank array and is modular Equation 2.7: Specific Power of Fuel Cell System trend Equation 2.8: Power Density of Fuel Cell System trend 25 POWER (kW)PDF Image | Regenerative Fuel Cell
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