XPost: rec.arts.comics.strips   
   From: tkoenig@netcologne.de   
      
   Cryptoengineer  schrieb:   
   > On 1/10/2026 4:31 AM, Thomas Koenig wrote:   
   >> Lynn McGuire  schrieb:   
   >>   
   >>> We ran on our 38 kW whole house generator last summer for four days   
   >>> after hurricane Beryl in the Houston area.  It runs our 7 tons of air   
   >>> conditioning easily,   
   >>   
   >> 7 tons of air conditioning?   
   >   
   > Freedom units!   
   >   
   >  From Wikipedia:   
   >   
   > "A ton of refrigeration (TR or TOR), also called a refrigeration ton   
   > (RT), is a unit of power used in some countries (especially in North   
   > America) to describe the heat-extraction rate of refrigeration and air   
   > conditioning equipment. It was originally defined as the rate of heat   
   > transfer that results in the freezing or melting of 1 short ton (2,000   
   > lb; 907 kg) of pure ice at 0 °C (32 °F) in 24 hours.[1][2]"   
   >   
   > Is also 12,000 Btu/hour, or 3.5 kW.   
      
   So 7 tons is around 24 kW (at 0°C, of course efficiency depends   
   on temperature; this is obviously a nameplate capacity.  Actual   
   cooling capacity depends on the temperatures involved, obviously).   
      
   Sounds like a _really_ huge air conditioning unit, but I know that   
   building insulation is almost unheard of in the US.   
      
   On that topic: I recently browsed through a book on refrigeration   
   technology written in 1888 (which was a gift for one of my sons,   
   also an engineer).  Although entropy was known in principle at the   
   time, it did not feature in the book, but adiabatic expansion and   
   compression did.  The preface contained the statement that the   
   heat released from burning coal should be equal to the heat you   
   can remove in a refrigeration, as a theoretical limit.  That is,   
   of course, bogus.  The author also did not have the advantage of   
   consistent units; the first law of thermodynamics was formulated   
   really strangely.   
      
   One method for producing artificial ice struck me as really weird -   
   pull vacuum, part of the water will evaporate and the rest will   
   freeze.  Yes, that will work, but is really inefficient.   
      
   But the drawings were great.   
      
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    * Origin: you cannot sedate... all the things you hate (1:229/2)