XPost: sci.space.policy, sci.physics   
   From: fjmccall@gmail.com   
      
   You know, Chimp, you're an intellectual coward.  If you want to reply   
   to me, REPLY TO ME, not to some troll quoting me.   
      
   jimp@specsol.spam.sux.com wrote:   
      
   >In sci.physics Serigo  wrote:   
   >> On 10/15/2016 5:34 AM, Fred J. McCall wrote:   
   >>> jimp@specsol.spam.sux.com wrote:   
   >>>   
   >>   
   >>>>   
   >>>> So how much to put about 25 of these on Mars so you can convert dirt   
   >>>> to structural steel?   
   >>>>   
   >>>   
   >>> Why in the hell would you need 32 MW of power to make steel?  Total   
   >>> power required to make a ton of steel from ore is around 5 MW-hrs.   
   >>> You'd size your operation based on the power you had available and how   
   >>> much steel you need.   
   >>>   
   >>>   
   >>   
   >> Wrong again.  you skipped over the part where you get ore from dirt, how   
   >> much energy is that ?   
   >   
   >It actually takes 10-19 MW to turn iron ore into steel, not counting   
   >the energy required to dig out, transport, and crush the ore.   
   >   
      
   Nope.  National averages run around 5.5 MW-hr per tonne.   
      
   >   
   >http://www.lowtechmagazine.com/what-is-the-embodied-energy-of-materials.html   
   >   
      
   Note that your numbers don't even match those of your source.   
      
   >   
   >> AND you skipped over the fact that the steel making facility is built   
   >> and operated in a vacuum, add in those costs in terms of energy, and   
   >> cleaning the air inside from fumes, that cost.   
   >   
   >Making steel requires a lot of oxygen.   
   >   
      
   Yes, it does.  So?   
      
      
   --   
   "Der Feige droht nur, wo er sicher ist."   
           --Johann Wolfgang von Goethe   
      
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