europe.theoildrum.com - 11/5/2009
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Energy Return of Water Invested (EROWI). From an article by Robert Service in Science Magazine.
The readers of "The Oil Drum" are familiar with the concept of "Energy Return of Energy Invested" (EROI or EROEI). It is the ratio of the energy produced by an energy plant during its ...
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EROWI - energy return of water invested
Peak Oil News —
... plant. EROEI remains one of the most useful parameters that can be used for evaluating an energy technology, but it is not the only one. Another element is the need of water. Water is needed for irrigation of plants to be used as fuel and all large plants using thermal engines need water cooling. We can speak, then, of Energy return of Water Invested (EROWI). It is a concept much more recent than that of EROEI, but which is rapidly gaining attention and may be not less important. http://europe.theoildrum.com/node/5923 "
Water - Nov 6
Energy Bulletin - —
... ...Greywater is not safe to drink, but any pathogens or organic material in it are quickly broken down and used up in the topsoil. Greywater can be safely used to irrigate ornamental plants and fruit trees but not root crops. Water conservationists today talk about the benefits of "cascading" water quality — the notion that drinking water should flow to the bathtub and, once used, from there to the backyard, carrying nutrients to ornamental plants and fruit trees. (13 Oct 2009) EROWI - energy return of water invested Ugo Bardi, The Oil Drum: Europe The readers of "The Oil ...
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The financial return on energy invested
europe.theoildrum.com 6/24/2009 —
Global GDP data from the USDA. Primary energy data and energy prices from the BP statistical reveiw of world energy 2009.
Global GDP has grown steadily and continuously since WWII, in step with a growing global population and primary energy ...
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