From: mikkelhaaheim@gmail.com   
      
   Le vendredi 16 septembre 2016 02:33:04 UTC+2, Rick Pikul/Chakat Firepaw a   
   écrit :   
      
   > >    
   > > Incorrect. Cold running simply means that waste heat will have to be   
   > > limited to what can be safely absorbed by the internal heat sink   
   > > (cryogenic supply)   
   >    
   > Which isn't that much, expect no more than a few months under ideal    
   > conditions.   
   >    
       
   Right... here's a worked example.   
   A single person, running a high fever, will emit a little shy of 500 W (or 500   
   Joules each second). This translates to 43 200 Joules (43.2 kJ) / day.   
   A single tonne of ice (a little over 1 m^3) will absorb well over 700 MJ in   
   transitioning from ice at 73°K to water at 290°K (actually, this would be   
   closer to 735 MJ or more).   
   This means that your tonne of water will serve as a nice heat sink for a crew   
   of 16 for 1 day, or a crew of 1 for 16 days. Well, that doesn't sound like   
   much. However, let's go on to a supply of 1 kT of ice (a little over 10m x 10m   
   x 10m) at 73°K. This    
   will absorb 700 GJ. This would absorb 8.3 kW waste heat emissions for 1000   
   days (a little under 3 years), or about 25 kW emissions over 333 days (11   
   months).    
   Please note that these 25 kW are waste heat emissions. 1 kW is the equivalent   
   of 2 crew; or the waste heat from a 2 kW device running at 50% efficiency, or   
   the waste heat from a 5kW device running at 80% efficiency. A theoretical   
   device running at 100%    
   efficiency would be converting all energy to work, and would emit no energy to   
   be detected.   
   If you are hard pressed, you could let the water (and the atmosphere) warm up   
   to 35°. For each tonne of water, you absorb an extra 60 kJ (actually, a   
   little bit more).    
   A sufficient layer of aerogel will prevent the bulk of this waste heat from   
   escaping. This should prevent emissions of over 6 or 7 W/m. Proper   
   architecture should further limit detectability.   
      
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