integrator step size and calculation execution rates hysys

[marchese85]

Hello everyone!
I'm working on a dynamic simulation in hysys !!!...I simulate a batch distillation...i'm using the default value of integrator step size and maximum (in the integrator tab).the simulation is highly unstable and are not respected material and energy balances!!!!!...can anyone tell me how to change the default value ?????
thanks in advance
p.s. sorry for my english

[JuanMa]

Hi marchese85
When you have these type of problems the best thing is to reduce first to 1,2,2,5 and also the time step to 0.25 seg if it persists then go to 1,2,2,2 and also 0,25 then to 1,1,1,1 and 0,1 if it persists for a batch distillation then it is because you have something ill defined.

Regards
Juan

[marchese85]

Hi juan
Thank you so much....a last question ... Can i set the maximum value in the integrator tab at 20 seconds or even this must be reduced ?????
sorry for my english
best regards