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maybe you specified too large heat transfer coefficient for metal or the airflow velocity is rather small and is comparable with the coolant flow velocity? The best way of checking out the correctness of your calcs is to make the check using the physics laws If the heat transfer is too large and all heat is gathered by a coolant, you can get such results, imho.
Turns out that by upgrading from SW2008 SP0.1 to SW2008 SP3.0, the flowork calculations now are much closer to reality. Probably only applies to problems with high temperature gas.