dear all
I'm having a great problema.i must simulate a dynamic evaporation in HYSYS 3.2, but I can't run it.I have built a simulation in steady state and inserted the valves on the feed boundary with the relative controller (i have inserted a PC controller that regulates a valve on the vapor exit). In steady-state simulation runs unless problem. When I go to the dynamic state problems begin. The evaporator is charged at time zero to 50%, but if I enter the initial conditions of flash different than the default (what are???), the simulation calculates of values of P i the evaporator / separator increasing (1000 kPa instead P atm): I tried to change the values of step-size in the integrator but without results.
can someone help me ?????
thanks in advance
please help me!!!!!!!!!!

p.s sorry for my bad bad english!!