From: ralphb@zip.com.au   
      
   G'day,   
      
   Would a OTEC system work in the internal ocean of an ice world like Europa   
   or Enceladus? As I understand it OTEC systems on Earth work because of the   
   temperture differential between the warm surface water and cold deep water.   
   There would be a far greater temperture difference between the surface   
   temperture and the warm liquid water.  What would be a good working fluid,   
   methane?   
      
   ta   
      
   Ralph   
      
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