24 Sep '16, 9pm

Germany unveils world’s first zero-emissions hydrogen-powered passenger train https://t.co/yHu0StDOa6

This sounds good, but the numbers don't pan out. Hydrogen is manufactured from electrical energy. Hydrogen electrolysis is a low-efficiency system that loses a lot of energy. (Around 20% efficient in a well-run system.) Burning hydrogen is at most a 40% efficiency system. 0.2 x 0.4 = 0.08. So these are approximately 8% efficient at converting the electrical energy into motive power to the train. Hydrogen is hard to store. Hydrogen leaks from any container because the atoms are so small. NASA used to figure 10% of the liquid hydrogen fuel would evaporate per day. So when you put it all together, by the time it's used, you may use 2%-5% of the electrical energy generated to move the train. That's just terrible energy economics. Back that up into the calculations to figure out the energy payback of the solar or wind farms used to create the power? It's terribly wasteful. This...

Full article: http://inhabitat.com/germany-unveils-the-worlds-first-zer...

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