Alaskaman66 - Yes indeed it was an FCV. We refueled at the Idemitsu fueling station in Chiba. Was a forecourt dispenser similar to your gasoline pump, except they use a positive lock on the nozzle similar to the CNG nozzles. Storage tank walls at the filling station are about 3 inch thick walled off at a distance.
about the flywheel, i believe that it is great to store energy into a stationary system, but a moving car would become difficult to steer. it is like holding a bicycle wheel standing on a lazy susan in a science experiment.
I once heard that helicopter store energy similar way. In emergency (when helicopter lost power and fall), it change the direction of rotor and make the rotor rotating by the falling energy. Then almost at ground, it change rotor angle so that it fly again by the rotating momentum of rotor.
I am trying to get an idea of the life expectancy of the supercap. Slide 21 show % of Cr at a voltage level falling very low over 5500 hours. Is that the expected life time of the supercap as a device or am I understanding it wrong.
Interesting energy harvesting app: Navy is replacing steam catapults on carriers with electric motors. The arresting cable is connected to a generator that charges some storage system. This energy helps launch the next plane. I have also seen huge room-sized megajoule capacitors, not necessarily associated with the carrier launch system.
inrush, shoot-through, ESR, temps ... I need to do a lot of research now into super caps ... good intro here .. sounds like there might be a lot of insertion opportunities if chosen and designed in properly
Digital_Angel - Let's just say supercaps are more tolerant of higher temperatures compared to lead-acid batteries.Batteries provide higher output at higher temperature but at the risk of lowering their cycle life.
@wonohkim microchip is one example - look at their battery charging devices and app notes ... they bring up issues at least, some of which may require further research. Think on the recent Boeing Lithium Ion issues ... (much higher power tho)
Dr. Lund saw the need for this sensor when he worked for Dept of Transportation and Public Facilities one summer. They are used for culvert monitoring, some ofwhich have steam pipes installed so they can be thawed if they freexe up and block. Otherwise, you get overflow across the road, which makes a real mess. Saves the crews from having to do scheduled checks..
By a lucky coincidence, yesterday's local Anchorage news featured a story about an electrical engineer at UAA, Dr. John Lund, who has developed a small remote sensor platform that uses harvested energy from two solar cells to operate. The sensor stores data, and when it has enough energy to do a burst transmission, it reports to its network. It is designed to last sixty years with no maintenaince. Check out the story at KTUU.com web site...
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