One of this year's recently-announced 2011 R&D 100 Awards is the Autonomous vehicles, fossil-fuel free. This "Cryo-Force Power-Cell System" (CFPCS) was developed by Sierra Lobo Inc., Milan, Ohio, with funding from the Department of the Navy, Office of Naval Research (ONR), Arlington, Va., and the Naval Undersea Warfare Center (NUWC), Newport, R.I. The Award states that the CFPCS is "...an integrated, closed-loop liquid oxygen and liquid hydrogen [-fueled] proton exchange membrane (PEM) fuel cell system, [and] has been designed to help unmanned underwater vehicles (UUVs) transition away from large-battery and fossil fuel technologies. ... The significant technological advancement is the integration of cryogenic pure reactants with a fuel cell system while meeting U.S. Navy specifications of storing 50 kg of oxygen and delivering 0.1 to 100 g/min of oxygen to support a 10 kW fuel cell system."
R&D Magazine describes the CFPCS as "Technology: Closed-loop fuel cell power system." Given that this is not what fuel cell people call a closed-loop system (i.e. one that makes its own fuel and oxidizer, A.K.A. a regenerative fuel cell), but merely a fuel cell system that stores it's exhaust (similar to a closed circuit rebreather SCUBA diving system), I thought I'd check for any other product details that needed clarification.
The untitled picture on the left is shown in the R&D Magazine article as if it is a photograph of the new 10 kw Sierra Lobo CFPCS installed in a UUV test bed. Having never heard that the Navy demonstrated a complete cryogenic reactants-based 10 kW PEM fuel cell system in a UUV form factor, I thought I'd look to see what Sierra Lobo has reported. Well, the picture on the right is Sierra Lobo's 1 kWe brassboard test system as it appears on their Unmanned Underwater Vehicle Power Systems page. I had to use Google to find Sierra Lobo's version of the UUV demonstration, and found their YouTube video:
I'm confused why Sierra Lobo has not updated their Web site to include a photograph of their UUV brassboard, or a link to their YouTube video!
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Keith - Note that I did not say "clean" in my writeup. And R&D Magazine only stated that the new system will help the Navy "...transition away from large-battery and fossil fuel technologies..." However, I agree with you that these days most H2 is not produced from renewable energy sources, but from reforming natural gas. This basically includes all the fuel cell refueling stations being demonstrated by Air Liquide, Air Products, Linde, Shell, etc.
I question the claims about clean fuel/energy. What is the source of LOx and H2? Likely electricity, generated by fossil fuel or nuclear. They should tout the energy density and leave the "green" argument out.
Keith - Note that I did not say "clean" in my writeup. And R&D Magazine only stated that the new system will help the Navy "...transition away from large-battery and fossil fuel technologies..." However, I agree with you that these days most H2 is not produced from renewable energy sources, but from reforming natural gas. This basically includes all the fuel cell refueling stations being demonstrated by Air Liquide, Air Products, Linde, Shell, etc.
Posted by: Keith D. Patch | September 20, 2011 at 08:44 PM
I question the claims about clean fuel/energy. What is the source of LOx and H2? Likely electricity, generated by fossil fuel or nuclear. They should tout the energy density and leave the "green" argument out.
Posted by: Keith | September 19, 2011 at 05:32 PM