Hi everyone

i got a problem when i was simulating refrigeration process in LPG plant by using Aspen HYSYS7.1, it was JT Valve that placed before 3 phase separator.
So, How to make model that can act like JT valve in Dynamic simulation? there was no problem while i took it in steady state model, but when i ran it in dynamic mode, the vapour fraction outlet valve was running by 1 which means that theres no liquid formed in the outlet of valve and JT process is failed to get. it felt that the JTV was acting like usual valve. I've been searcing in several journals but i have no result which discuss about how to model it.

so how to model the Joule Thomson valve in aspenHysys7.1 in dynamic simulation?or maybe, is there any kind of ways that could i take to solve this problem?


thanks alot.