Data Center Cooling, "Thermodynamics is both Simple and Complex"

My father and grandfathers helped me to develop a straight forward way of looking at and then solving any problem that came my way.  I have that same straight forward thought process as the foundation of my consulting practice.

When it comes to cooling in Data Centers and the debate starts up over raised floor versus other options I always use this example.  When you stand in front of the fridge trying to decide between the chocolate and vanilla ice-cream where do you feel the cold first, on your feet or on your face?  Right cold goes down without any help.  So why build or renovate data center space based on a cooling system that has to not only move large amounts of cold air across a distance from the CRAC units but must also try to push it up through a bunch of little holes.  I feel the closer the cold air source is to the front of the servers the better the chance the cold air will get into the intake of the servers efficiently.  I always consider in row refrigerant based cooling as the first option.