try looking through the database at the Journal of Turbomachinery from ASME, you might find something there.
-carp
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If you are working with water at a saturated vapor state, the temperature of the 30 bar (3000 kPa) will be around 234C, and the 50 bar (50000kPa) will be around 264C. This confirms your delta T as being bigger for the 2nd way. As for the enthalpy, if you had the exit conditions for each one...