jasper wrote:Apologies, I missed your post.
That is certainly an interesting message that you flag there. You are correct about the default value.
The other message is rather interesting. Why would Aspen HYSYS possibly require a phase fraction to be set to calculate an activity? Can you calculate other properties under the same conditions?
Yes, I can calculate some other properties such as "logFugacityCoefficient, Compressibility, compressibilityFactor, fugacity, ..." but
NOT these properties "activity, activityCoefficient, diffusionCoefficient, gibbsEnergy, heatCapacityCp, etc. ". I will discuss this with AspenTech support.
jasper wrote:Can you get logFugacityCoefficient? In that case you can work around the problem.
Yes, I can get it. So, this can be a work around the problem.
Thank you for your help,