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LH2 has even worse leakage than pressurised H2, due to boil off and what’s called loading loss. Loading loss is the venting required during LH2 tank filling and is very high if you want to transfer a large quantity quickly. The Space Shuttle would transfer 135 tons of LH2 to put 103tons in the tank in three hours thus venting 32 tons, or 170 ton transfer in 2hours venting 67tons. Now consider that a big European or American hub airport would be using maybe 10K tons per day and expecting tank filling in under an hour, so how much would be lost?By comparison Ammonia is water soluble so invariably gets washed out of the atmosphere. Also Ammonia is part of a natural cycle almost as old as the planet’s atmosphere ie the nitrogen cycle, so is in a state of continuous decay and renewal. We currently directly soil inject about 150 million tons every year for agriculture which is tiny fraction of the amount occurring in the natural cycle.However despite Ammonia having zero global warming potential, a natural atmospheric decay cycle, rapid transfer, easy and leak free storage, the hydrogen religion in Europe lacks interested in it’s development as an energy carrier. Shame really given all the hype about being so eco focused and motivated.
LH2 has even worse leakage than pressurised H2, due to boil off and what’s called loading loss. Loading loss is the venting required during LH2 tank filling and is very high if you want to transfer a large quantity quickly. The Space Shuttle would transfer 135 tons of LH2 to put 103tons in the tank in three hours thus venting 32 tons, or 170 ton transfer in 2hours venting 67tons. Now consider that a big European or American hub airport would be using maybe 10K tons per day and expecting tank filling in under an hour, so how much would be lost?
By comparison Ammonia is water soluble so invariably gets washed out of the atmosphere. Also Ammonia is part of a natural cycle almost as old as the planet’s atmosphere ie the nitrogen cycle, so is in a state of continuous decay and renewal. We currently directly soil inject about 150 million tons every year for agriculture which is tiny fraction of the amount occurring in the natural cycle.
However despite Ammonia having zero global warming potential, a natural atmospheric decay cycle, rapid transfer, easy and leak free storage, the hydrogen religion in Europe lacks interested in it’s development as an energy carrier. Shame really given all the hype about being so eco focused and motivated.
