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Liquid Hydrogen As A Reservoir Of Energy
Liquid hydrogen is the form taken when the gas is cooled below its critical point, where the change of state from a gas occurs. The gas is cooled to a fluid as a concentrated state of storage for its usefulness as a clean fuel. The possible applications as a source of energy make this a common choice for liquid fuel. In the future, this may become the basis for a clean fuel economy.
In studying the nature and properties of gases during the nineteenth century, chemists developed the process known as regenerative cooling to change gases into their fluid state before the compact gasifier. Gaseous hydrogen, or H2, was first cooled into its fluid state, called LH2, by using a vacuum flask and regenerative cooling. A colorless fluid that liquefies at -423 Fahrenheit was the result.
This gas has two forms to its molecule known as the ortho and para isomers. Isomers are different structures taken by the same molecule. At normal temperatures, the isomers of this gas exist in the proportion of three ortho to every one para isomer. In order to store it in a stable form of liquefaction, this element must be over 99 percent parahydrogen to be in equilibrium. Otherwise, an exothermic reaction, or probable dangerous sudden release of heat, can occur at the critical point.
Storage in the liquefied state is preferable since it becomes so compressed compared to the gaseous state. A compressor that works like and resembles a jet engine is how the gas is condensed into the fluid form. By greatly expanding the surrounding area, the gas condenses and the heat is removed. Using a heat exchanging device, the gas is cooled until it reaches the critical point.
When LH2 is mixed with oxygen, it burns and water vapor is the by product of oxidation. It is so cool in fluid form that it also works to cool the engine parts and condense the water vapor into water. Since water is not a toxic emission, this is considered a clean burning fuel, a green alternative to hydrocarbon producing fossil fuels.
LH2 is being considered as an alternative fuel. Used as a fuel for internal combustion engines, the liquefied form works better than its gaseous state because of its lower energy density than gasoline or natural gas. This gas is somewhat more difficult to store than some other liquefied gases due to its extremely low temperature.
This substance is considered a good fuel storage choice for fuel cell technology and automobiles. Advances in alternative fuel car designs have successfully applied this approach. Several models of submarines also use this as fuel. Rocket engines which run on H2 and O2 use extra H2 so that some remains unburned in the exhaust. This helps to reduce oxidation of the engine parts and increase the momentum produced by the engine.
Advocates for an economy based on this gas see liquid hydrogen as an alternative energy carrier. Since the gas must be produced using some other energy source and a advanced gasifier, it is considered a carrier rather than a source of energy. Fossil fuels release hydrocarbons into the atmosphere and the supply of them is diminishing daily. LH2 may gain great importance as a clean fuel for cars, boats, buildings many other uses.
