13 Jan '14, 3pm

Part 1 of this series defines what we perceive as the problem with energy, and tries to find better solutions. @ttinc

One final issue for energy conversion is the entropy change of the conversion. Many conversion processes have an enormous increase in entropy, as exemplified by the burning of natural gas to heat bathwater to 100 F. Heat at this low temperature can be had for free in any of a number of conversion processes that involve a much lower rise in entropy than simply converting a highly ordered energy form to low-grade heat. Given the large appetite of residential occupancies for low-grade heat, whether space heating or domestic hot water, a relatively large portion of U.S. energy consumption accrues from end uses that should be served by recovery of waste heat, with no use of source energy at all. A new method of evaluating energy conversion efficiency is called “exergy.” This method analyzes any conversion efficiency not only for the percentage of output energy to the percentage...

Full article: http://www.edcmag.com/articles/95409-a-new-approach-to-ev...

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The South China Morning Post reported that“the direct cost of pollution accounted for 2.5 per cent of total economic outpu...

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