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Let me know how much heat you want to dump (is there a figure in the engine spec?) and I can give it a crack.  You can't get very much out of the wings because of the honeycomb/composite structure and the thick boundary layers compared to those in heat exchangers.  You cannot get nearly enough heat to de-ice the wings.  That takes lots of heat, more than composites can stand.  (I examined running coolant from a liquid cooled engine in the leading edges. Forget it.  Too many problems.)  My initial guess is that you are much better off with the heat exchanger, but I would be happy to have a look and do a few calculations. Fred Moreno

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