XPost: sci.space.policy, sci.physics   
   From: invalid@invalid.com   
      
   On 10/17/2016 6:32 PM, Fred J. McCall wrote:   
   > Serigo  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.   
   >>>   
   >>   
   >> Wrong.   
   >>   
   >   
   >>   
   >>>   
      
   >>>> Making steel requires a lot of oxygen.   
   >>>   
   >>> Yes, it does.  So?   
   >>>   
   >>   
   >> Mars does not have any O2.   
   >>   
   >   
   > But it does have both CO2 and H2O, either of which can be easily used   
   > to make O2 (which is what we'll do for breathing oxygen anyway).   
   >   
   >   
      
   You are more of a dreamer, not based in reality too much.   
      
   so how do you get O2 from CO2 ?   remember  you need the carbon too for   
   your steel mill on Mars   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)