Should be plumbed the other way around hot in the back cold out of

the front.

     The air warms up as it passes the front core keeping a more or less
     constant temp difference between cooling air and the core (liquid).
     Paul Lamar

This principal mimics the way that nature designed the blood flow

through

a fish's gills.  The capillaries flow counter to the
water flow through the gill,  so that the most oxygen deficient
 blood (which has the highest affinity for oxygen) is exposed to
the water exiting the gill, and the blood that is already partially
oxygenated is exposed to the water coming into the gill (and
is the most oxygen rich water). Really an efficient design.
Billions of years of evolution is a great engineer.

Don't mean to be pedantic, but nature is a great teacher.

Brian Trubee

It is efficient by design - that's a great engineer!

Terry Adams

 
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