08 Feb '12, 3pm

The alternative energy matrix | Energy Bulletin: The alternative energy matrix. by Tom Murphy. Breathe, Neo. I'v...

The alternative energy matrix | Energy Bulletin: The alternative energy matrix. by Tom Murphy. Breathe, Neo. I'v...

Geothermal Heating with Depletion : A vast store of thermal energy sits in the crust, locked in the rock and moving slowly outward. Being the impatient lot that we are, we could drill down and grab the energy out of the rock on our own schedule, effectively mining heat as a one-time resource. In the absence of water flow to convect heat around, dry rock will deplete its heat within 5–10 meters of the borehole in a matter of a few years, requiring another hole 10 meters away from the first, and so on and so on. I classify this as moderately difficult, requiring a never-ending large-scale drilling operation across the land. The temperatures are pretty marginal for running heat engines to make electricity with any respectable efficiency (especially given so many easier options for electricity), but at least the thermal resource will not suffer intermittency problems during th...

Full article: http://www.energybulletin.net/stories/2012-02-08/alternat...

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The Alternative Energy Matrix

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