Macaque Posted January 21, 2007 Report Share Posted January 21, 2007 Hi I also post as Dog on HPC Hydrogen is touted around as the wonder fuel of the future. I have serious doubts about this for two reasons. Firstly, very heavy pressure vessels have to be used for storing hydrogen in useful quantities. When hydrogen is handled outside, it is a very forgiving gas. It has a low combustion temperature and rapidly disperses into the atmosphere. Inside buildings however it is a very different story. It has a very low ignition energy (which means that the tiniest spark can cause a flammable hydrogen mixture to ignite). It has a very wide flammability range (which means that small concentrations (4%) of hydrogen mixed with air can ignite). It is a very light gas and easily accumulates in overhead pockets within buildings. It also has a very high combustion velocity which is a particularly nasty characteristic. Hydrogen deflagration within a confined space can rapidly progress into a detonation. Detonations tend to rip buildings to pieces. Hydorgen powered machines would be very difficult to store or use within enclosed spaces. Hydrogen powered cars for example could be extremely dangerous if parked in a garage or multi story carpark. So we have a wonder fuel which is too heavy to move around easily and is too dangerous to use or store inside buildings. Link to comment Share on other sites More sharing options...
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