We are working on a version of direct air capture that can coexist with intermittent energy resources. In effect, we use a cryo-approach to producing dense CO2 and we can create the coolth whenever power is available. As a result we can live with intermittent energy sources like PV or wind. Indeed, we could transmit energy from a remote installation as liquid. If you do the math, you see that a pipeline full with liquid density fuel easily outperforms a power line. Ocean going tankers are even better at it. So you could make liquid fuels from CO2, H2O and PV power, and ship much of it out as liquid fuel. The DAC can handle the intermittency, and so can Fischer Tropsch plants. What you need to get better at is splitting water and/or CO2 with a device that can handle intermittent use. It comes down to a capital cost argument.
Klaus From: <[email protected]> on behalf of Peter Eisenberger <[email protected]> Reply-To: Peter Eisenberger <[email protected]> Date: Sunday, September 17, 2017 at 10:49 AM To: "[email protected]" <[email protected]> Cc: "Hawkins, Dave" <[email protected]>, "[email protected]" <[email protected]>, geoengineering <[email protected]> Subject: Re: [geo] Swanson's law I agree with this 100% On Sun, Sep 17, 2017 at 7:14 AM, Michael MacCracken <[email protected]<mailto:[email protected]>> wrote: A problem at present is that present high-voltage/alternating current distribution lines mean that low-cost transmission of electricity is limited to a few hundred miles, so one would have to disperse DAC. If instead there were large-scale high-voltage/direct current distribution lines (see MacDonald et al., Nature, January 2016), then there could be long distance, low-cost transmission over large distances and one would have a much better likelihood of having access to any stranded energy (from wind, solar, geothermal, nuclear, etc.), all while having DAC located where it would be optimally able to store the captured carbon. Just another reason, among many, for having large-scale HV/DC networks across the world's continents. Mike MacCracken On 9/17/17 10:50 AM, Hawkins, Dave wrote: Using stranded renewable energy for DAC is an interesting idea. Question is what energy resource will be used during periods when there is no surplus RE? If DAC does not run 24/7 its costs go up. If DAC uses RE to run 24/7, that requires a larger RE system with associated stranding. If DAC uses something other than RE, what is it? Ideally, we would have an economically dispatchable zero-carbon resource. This is not an argument against DAC, just an observation on system complexity. Sent from my iPad On Sep 17, 2017, at 3:58 AM, Andrew Lockley <[email protected]<mailto:[email protected]>> wrote: Does anyone have a breakdown of projected input costs for Direct Air Capture? I'm interested in quantifying the energy component. Swanson's law predicts reliable falls in the cost of solar. Without storage, much peak-time solar could be wasted, unless it's used for time-insensitive applications like DAC or desalination. (I understand Keith's process needs electricity, but Lackner's instead needs heat.) My hypothesis is that DAC could become vastly cheaper, if energy costs trended down as expected due to Swanson's law, and cheaper still if it became a way to use this stranded energy. I'd welcome thoughts, data, projections and comments. Thanks Andrew Lockley -- You received this message because you are subscribed to the Google Groups "geoengineering" group. 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