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Jim Logajan wrote in
: Bertie the Bunyip wrote: The volume thing is a non-issue with metal hydride tanks as well as the safety issue. The information I've found on metal hydrides is not nearly so optimistic. Allegedly about 4 times heavier per unit of energy than gasoline and many of the known metal hydrides (e.g. lithium) themselves being health hazards. Well, they're tanked for life and like for like the crap that's in modern gasoline is probably worse. Metal hydrides are heavy, no doubt about it. Very heavy. Too heavy for airplanes, certainly. There's a number of hydride combinations that look to improve on that. They do provide a practical way of carrying H2 safely in a reasonable volume, though. I'd be a lot more comfortable driving a car so equipped than an H2 powered car with a simple pressure tank. They have another drawback as well. Temperature. The hydrides only release the H2 at a usable rate when the temperature in the tank is high enough. How high depends on the hydrides used, but it's warmer than ambient most of the year. So you need to heat it up a bit. Not a big problem, but it is an added complication. Bertie |
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