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energy balance help..
I am really struggling with this question..
Liquid water at 60 bar and 250 degrees C passes through an adiabatic expansion valve, emerging at a pressure Pf, and a temperature, Tf. If Pf is low enough, some of the liquid evaporates.
If Pf = 1 bar, determine Tf, and the fraction of the liquid feed that evaporates. Assume kinetic energy = 0
So, from the tables in the book, I think Tf would be 200 degrees celsius for 1 bar...?
Then, the equation simplifies to become Q = delta H
and delta H = mass * change in specific enthalpy.
But I dont know the mass flow rate. The question suggests writing an energy balance, but without m, what can I do ?
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