Being pedantic, it's not a "completely closed system" that would make it a perpetual motion machine.
It's a "closed physical system", or at least, approximately, depending on the consequences of heat loss in the rock (shrinkage, cracking, phase changes e.g gases liquify, liquids solidify etc., chemical reactions that occur at lower temperatures). There's no such thing as free energy. It all comes at a cost. On 2/05/2013 2:02 PM, [email protected] wrote: > A pleasing announcement. At its best, geothermal power generation uses no > coal, oil, earth-movement etc to generate electricity. An EGS is a closed > system producing electricity with no input required. They simply drill two > holes into bedrock, then create/extend a fracture-cavity 'ball' in the hot > rocks. They pump water down one hole and up it comes out the other one hot > enough to generate electricity. Optimally, it's a completely closed system. > > Of interest, Geodynamics received half of their start-up capital from ANU. > They're already the star of the Wikipedia EGS world chart. Now they shine. > > http://en.wikipedia.org/wiki/Enhanced_geothermal_system > -- Regards brd Bernard Robertson-Dunn Sydney Australia email: [email protected] web: www.drbrd.com web: www.problemsfirst.com Blog: www.problemsfirst.com/blog _______________________________________________ Link mailing list [email protected] http://mailman.anu.edu.au/mailman/listinfo/link
