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18 comments on The Bullroarer - Friday 30th May 2008
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18 comments on The Bullroarer - Friday 30th May 2008
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GAIA Host Collective
Does anyone actually know if they are doing closed loop ?
I've always assumed that is part of the design (either I read it somewhere or just decided you'd have to solve the water issue for large scale generation) but it would be nice to have confirmation.
That Birdsville plant is cool - must be saving them a lot of money the way diesel prices are going.
Gav,
Geodynamics is planning to go closed loop, but has not as yet implemented it.
Their testing has succesfully intersected two wells with the hot granite fracture zone and reportedly they have good pressure connectivity between the wells. (They plan a 1MW test generator - that should get the fridges in the Innaminka pub humming along pretty nicely! I've been to Innaminka and there aren't many other uses for power there - unless they convert all the dingoes to plug-in electric... Although maybe if they're looking for load they could pump some CO2 down the old Cooper gas wells!)
Interesting details on p8 of their March report: http://www.geodynamics.com.au/IRM/Company/ShowPage.aspx?CPID=1359
Does anybody know about the thermodynamics of this? They appear to have created a fracture zone of about 4 cubic km. How many MWh of productivity will they get before they have to drill and prepare a new fracture zone? Does any significant heat actually flow into the fracture zone from the surrounding country rock, or are you exclusively sucking down the heat in the fracture zone? Also what's the deal with mineralisation in the bores once the temperature starts to decline?
Sure - I know it isn't implemented yet - just wanted to confirm that my belief that they are going to build a closed loop system and thus the radon gas issue is a furphy.
How low it takes to cool the rocks down is an open question - but its my belief that if they drill say 5 pairs of holes and rotate between them they'll have a perpetual energy machine of sorts.