[Gasification] heat exchanger

[Toby Seiler]

Jim,
   
  A comment on heat exchangers that stuck with me is about turbulence.  Turbulent flow is not the proper flow to maximize heat exchange, laminar is.  The hot surface should be wiped clean of it's heat and moved on.  Turbulent flow regions in a given pipe should be avoided.
   
  A boiler is a big heat exchanger.  Fire tube boilers are often used for wood burning because of the larger passage size that does not clog as fast as the smaller spaces of the typical water tube.  But a water tube can have more surface area for collection.  Be it radiant or conductive, square feet matter.  
   
  Also the bending of the water tube can be shaped to collect from a given fire box. Water tubes over an iridescent catalyst unit fed from a gasifier would work, since most ash and solids would have been significantly reduced, compared to a direct wood fired boiler.  
   
  Regards,  Toby Seiler
   
   

       
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