Hi Andrew: A combination of marine microalgae production and BECCS makes sense in certain locations, and a combination of marine microalgae production and DAC makes sense in other locations, especially arid subtropical regions. We have a manuscript on the former that will soon be submitted.
Chuck Greene > On Sep 19, 2017, at 3:46 AM, Andrew Lockley <[email protected]> wrote: > > Why use DAC not BECCS? Suggest you reply on list > > A > > On 17 Sep 2017 19:14, "Charles Greene" <[email protected] > <mailto:[email protected]>> wrote: > Co-locating DAC and PV or concentrated solar with commercial-scale, marine > microalgae production facilities would provide onsite supply of electricity > and CO2 without the release of any additional emissions of fossil carbon. In > addition to producing fossil carbon-neutral liquid fuels and nutritional > products from the microalgae, the production of plastics and other > biopetroleum products for the human-built environment could lock up carbon > while generating revenue. This might be preferable to DAC and subsequent > carbon sequestration in geological repositories. The market for > carbon-negative biopetroleum products is not of sufficient scale at present > to create a large dent in the amount of carbon that will need to be stored. > However, the infrastructure required for the human-built environment is > enormous, and we would just need to be clever in how we substitute materials. > >> On Sep 17, 2017, at 1:49 PM, Peter Eisenberger <[email protected] >> <mailto:[email protected]>> wrote: >> >> 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. >>>> To unsubscribe from this group and stop receiving emails from it, send an >>>> email to [email protected] >>>> <mailto:[email protected]>. >>>> To post to this group, send email to [email protected] >>>> <mailto:[email protected]>. >>>> Visit this group at https://groups.google.com/group/geoengineering >>>> <https://groups.google.com/group/geoengineering>. >>>> For more options, visit https://groups.google.com/d/optout >>>> <https://groups.google.com/d/optout>. >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "geoengineering" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to [email protected] >>> <mailto:[email protected]>. >>> To post to this group, send email to [email protected] >>> <mailto:[email protected]>. >>> Visit this group at https://groups.google.com/group/geoengineering >>> <https://groups.google.com/group/geoengineering>. >>> For more options, visit https://groups.google.com/d/optout >>> <https://groups.google.com/d/optout>. >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "geoengineering" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] >> <mailto:[email protected]>. >> To post to this group, send email to [email protected] >> <mailto:[email protected]>. >> Visit this group at https://groups.google.com/group/geoengineering >> <https://groups.google.com/group/geoengineering>. >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. >> >> >> >> -- >> CONFIDENTIAL INFORMATION: This email message and all attachments contain >> confidential and privileged information that are for the sole use of the >> intended recipients, which if appropriate applies under the terms of the >> non-disclosure agreement between the parties. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "geoengineering" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] >> <mailto:[email protected]>. >> To post to this group, send email to [email protected] >> <mailto:[email protected]>. >> Visit this group at https://groups.google.com/group/geoengineering >> <https://groups.google.com/group/geoengineering>. >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. > > > -- > You received this message because you are subscribed to the Google Groups > "geoengineering" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To post to this group, send email to [email protected] > <mailto:[email protected]>. > Visit this group at https://groups.google.com/group/geoengineering > <https://groups.google.com/group/geoengineering>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- You received this message because you are subscribed to the Google Groups "geoengineering" group. 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