Originally Posted by
cattletruck
Interesting use of figures in that article, graph shows volume of H2 plus tank.
Table just shows energy per weight of fuel ignoring the weight of the tank.
An A size cylinder (180 Bar) weighs ~ 50kg and contains 43.9 L of H2 (STP) which is 4gm so cylinder is ~ 12,500 times the weight of the H2
From stuff I did on large CH4 tanks you can do a lot better if the tanks are not thrown around like cylinders are but you would still be looking at least 100 times the weight of the hydrogen. Two points to note:
- Up the pressure and the thickness (weight) of steel goes up in proportion
- The steels required aren't cheap moreso for Aluminium, Kevlar etc