O.K. This is from memory which in my case can be somewhat cloudy. But

I

remember the F-16 having a Heat exchanger in the fuel system. It used

fuel

to cool either engine oil or hydraulic fluid. I don't remember which for
sure. Could a heat exchanger be put in a main fuel tank. Or maybe it

could

be installed in  some sort of sump or header tank to keep it immersed in
fuel? Would this work better than having the heat exchanger in the hot

oil

pan?
James Phillips

AFAIK, ALL large commercial jets use heat exchanger loops in the fuel tanks
to cool hydraulic fluid. When you get down to little or no fuel (we usually
do fuel tank repairs while doing other service, so we evacuate the tanks) it
severely limits the amount of duty cycle the hydro pumps can tolerate due to
heat.

As a standalone cooling system I don't know that I'd feel safe with it, but
as an additional (or primary, if you have a rad with cowl flaps to close off
when not needed) cooling source I'm pretty sure it would work.

Mike Harrington

AFAIK As Far As I Know ? :-)

Paul Lamar
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