From: trident5955@gmail.com   
      
   W dniu czwartek, 21 września 2017 01:24:23 UTC+2 użytkownik Luke Campbell   
   napisał:   
   > The equation as derived deals with waste heat delivered to the engine, not   
   total power.  Most of that power goes into accelerating the propellant exhaust   
   gasses.  Much of what is left over remains as thermal energy of the exhaust   
   gasses.  The figure    
   you need is the power absorbed by the engine bell.   
   >    
   > In addition, chemical rocket engines can use their cryogenic fuel to help   
   cool the engine bell, running it through pipes around the bell to transfer   
   heat to the propellant before combustion.  This active cooling helps deal with   
   the heat load.   
   >    
   > I can't remember the conversation where we were discussing this, but it may   
   have been while figuring out the limits of torch ship performance, in which   
   case the waste heat would be the x-rays absorbed by the surrounding structure,   
   and the energy    
   imparted by neutrons scattering off nuclei in the structure.    
   >    
   > Luke   
      
   Thank you VERY MUCH for response. Just one last question. Can you suggest some   
   reading? I'd love to learn what fraction of engine power ends up as waste heat   
   but I understand this may be too long topic for this thread. A book suggestion   
   would help.   
      
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