XPost: sci.space.policy, sci.physics   
   From: burrynulnulfour@ppllaanneett.nnll   
      
   On 15.10.16 17:25, 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 ?   
   >   
   > 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.   
   >   
   > your responces to posts here are simplistic, from 100,000 feet high with   
   > no reality, a salesman from Musk.   
   >   
   Steel production in Mars atmosphere may be much easier.   
   First:less heat-loss  (almost no conduction to air)   
   second:molten iron will not start burning(no oxygen in air)   
   So quality steel might be produced there with   
   less energy(compared to earth).   
   So on Mars by all means USE the opportunities provided   
   by a near vacuum.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)