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On 5/3/2015 10:10 PM, Skywise wrote:
Although liquid hydrogen has nearly 3 times more energy per unit weight, that does not take into account the mass of the containment vessel. A liquid hydrogen tank is going to more than 3 times as massive as a gasoline tank or fuel bladder, thus resulting in a net loss of energy per unit weight of the fuel plus it's container. I'm not sure where you got that information from, but it's wrong. Compressed hydrogen takes a heavy tank because of the pressure. On the other hand, liquid hydrogen need not be under pressure, so it does not need a massive tank. However, cryogenic fuels have their own issues! What a cryogenic fuel tank needs that is different from other liquid fuels is insulation. That insulation need not be heavy, but it will take up valuable volume in your airframe. Also, cryogenic tanks are always venting unless you have heavy, expensive power-hungry refrigeration equipment aboard. So that means that your liquid hydrogen-fueled airplane could be assumed to be sitting in a cloud of flammable gaseous fuel whenever it is fueled and sitting on the ground. No thanks! |
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