Hydrogen Fuel Stocks

[SilverSurfer]

reality check

The energy panacea of the moment is a concept called the “hydrogen economy.” Theorists propose to transition U.S. energy usage to hydrogen—a common element which, when combined with oxygen, releases energy with only water as a waste product. With hydrogen, it is claimed, we can achieve not only energy independence but also an end to pollution and global warming at the same time. The concept is entirely fraudulent.



Hydrogen is not a source of energy. In order to be obtained, it must be made—either through the electrolysis of water, or through the breakdown of petroleum, natural gas, or coal. Either process necessarily consumes more energy than the hydrogen it produces.



When hydrogen is made by electrolysis, the process yields 85 units of hydrogen energy for every 100 units of electrical energy used to break down the water. That is 85 percent efficiency. If the hydrogen is then used in a fuel cell in an electric car, only about 55 percent of its energy value will be used; the rest is wasted to heat and so forth. The net result of these two processes: the amount of useable energy yielded by the hydrogen will be only about 47 percent as much as went into producing it in the first place. And if the hydrogen is burned in an internal combustion engine to avoid the high production costs of fuel cells, the net efficiency of this vehicle will be closer to 25 percent.



Hydrogen produced from hydrocarbons instead of water also throws away 40 to 60 percent of the total energy in the feedstock. This method actually increases the nation’s need for fossil fuels, as well as greenhouse gas emissions. While hydrogen could also be produced by nuclear, hydroelectric, solar, or wind power, the process would continue to be dragged down by the fundamental inefficiency of hydrogen production. Such power supplies could always do more to reduce fossil fuel requirements simply by sending their electric power directly to the grid.



The bottom line is that hydrogen is not a source of energy. It is a carrier of energy, and one of the least practical carriers we know of.



Consider: A standard molecular weight (or mole) of hydrogen gas, when reacted with oxygen, yields 66 watt-hours of energy. Meanwhile, a mole of methane (the primary component of natural gas) produces 218 watt-hours of energy. An equal number of moles of both can be stored in a tank of equal size and strength. Thus, a car that runs on compressed methane will be able to store more than three times the energy, and travel three times as far, as the same car running on hydrogen. In addition, the methane would be cheaper.



In short, from the point of view of production, distribution, environmental impact, and ease of use, the hydrogen economy makes no sense. Its fundamental premise is at variance with the most basic laws of physics. The charlatans who are promoting hydrogen as a solution to our energy woes are doing the nation an immense disservice.



http://www.taemag.com/issues/articleID.18976/article_detail.asp