Larry Hendrix wrote:

Paul
I am out of my area of expertise, but I kind of remember that a counterflow heat exchanger is more efficient than a parallel flow exchanger.  If this is true, one way to mechanize the counterflow
radiator would be to use two thin coils - the aft coil accepts hot water from the engine; the water then flows into the forward coil.  The forward coil is cooled with the outside air stream, and the
aft coil is cooled with the warmed air from the front coil.

Another benefit from the two coils is that some pressure is developed on the face of the forward coil and the pressurer and airflow is more uniform across the area of the aft coil.  I know that one
of the design problems with air conditioner coils (condenser) and automobile radiators is that airflow is not uniform across the coil and little cooling is gained at the perimeter of the coil.

If this is off base, scratch this, and I apologize for taking your time.

Larry

I think what you are talking about here is a cross counter flow. 
Something like these illustrations. Properly implemented these could further reduce
the volume of the heat exchangers required to cool the Wankel.


Paul Lamar
 
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