Home  5  Books  5  GBEzine  5  News  5  HelpDesk  5  Register  5  GreenBuilding.co.uk
Not signed in (Sign In)

Categories



Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

Buy individually or both books together. Delivery is free!


powered by Surfing Waves




Vanilla 1.0.3 is a product of Lussumo. More Information: Documentation, Community Support.

Welcome to new Forum Visitors
Join the forum now and benefit from discussions with thousands of other green building fans and discounts on Green Building Press publications: Apply now.




    •  
      CommentAuthorfostertom
    • CommentTimeApr 23rd 2021 edited
     
    https://boingboing.net/2021/04/22/mars-perseverance-rover-successfully-inhaled-carbon-dioxide-and-exhaled-oxygen.html
    https://en.wikipedia.org/wiki/Mars_Oxygen_ISRU_Experiment

    Uses solar power to crack Mars atmospheric CO2 (@800C) to O2, with some CO2 and mainly CO as byproduct. I wonder what energy cost? Is this a way CO2 cd be 'cleaned' out of Earth atmosphere, large-scale?

    "CO may also be collected and used as a low-grade fuel or reacted with water to form methane (CH4) for use as a primary fuel" - by consuming the O2 produced, presumably? Circular madness?
  1.  
    Now if we could only hook this up to Bitcoin-miners so that they actually do something useful, it could be a win-win!
    •  
      CommentAuthorfostertom
    • CommentTimeApr 23rd 2021
     
    They could breathe the CO, you mean?
    • CommentAuthorEd Davies
    • CommentTimeApr 23rd 2021
     
    Posted By: fostertom: β€œIs this a way CO2 cd be 'cleaned' out of Earth atmosphere, large-scale?”

    Not really, because the CO by product just turns back into COβ‚‚ pretty quickly (within a few months):

    https://en.wikipedia.org/wiki/Carbon_monoxide#Atmospheric_presence

    That article says it'd actually make things slightly worse because the CO would react with other atmospheric constituents which would reduce their availability to breakdown methane which is quite a potent GHG while it lasts.
  2.  
    The technology is just a fuel cell in reverse, which is why it needs heat and electricity as inputs, and produces fuel and oxygen as outputs. Pretty much the same technology can be used to electrolyse water into hydrogen and oxygen, which is fairly energy efficient (70%+), so I guess in time the energy cost of reducing CO2 to CO could also be made fairly efficient. The energy cost of collecting the CO2 would also need to be considered.

    In principle, if you can create hydrogen and carbon monoxide on Mars (or Earth) you can make syngas (towns gas) which is the building block for synthetic organic molecules such as methanol or methane and even synthetic diesel or kerosene or waxes or plastics.

    If you were so minded you could inject those deep into rocks and so reverse the fossil-fuel CO2 emissions process.

    There are easier methods on Earth, you can already get self-assembling machines which can do the solar power generation, collect CO2 from the atmosphere and synthesise oxygen and also a range of useful solid and liquid products, which can be used for energy and carbon storage... 🌱🌡🌾🌿🌲🌳🌴:bigsmile:
Add your comments

    Username Password
  • Format comments as
 
   
The Ecobuilding Buzz
Site Map    |   Home    |   View Cart    |   Pressroom   |   Business   |   Links   
Logout    

© Green Building Press