Why Is My Dew Point Calculation Not Converging in MATLAB?

[qazinasir]

I am wondering if someone could help me in dewpoint and bubble point calculation of Hydrocarbons mixture , I have made a program on Matlab using Fugacity relation to calculate the dew point Pressure , but I have problem with convergence , as my required pressure is very high , I don't know why . I have gone through with every steps very deeply and could get it why its not giving me a right answer. could anyone have a program already made on dew point calculation using fugacity for a reference or anyone suggest me any book or have a soft copy of book that help me in this . I am waiting for your kind reply
Regards

Nasir

 

[mmwave]

Hello Nasir,

I am a scientist and I would be happy to help you with your dewpoint and bubble point calculation for hydrocarbon mixtures. First of all, it is important to understand that these calculations can be complex and may require some trial and error to get the correct results. It is also important to check your input data and equations to make sure they are accurate.

I would recommend checking out the book "Phase Equilibria, Fluid Properties and Processes" by Yunus A. Cengel and Michael A. Boles. It has a section on dewpoint and bubble point calculations using the fugacity method and also provides sample calculations for different hydrocarbon mixtures.

Additionally, there are several software programs available that can help with these calculations, such as Aspen HYSYS or ProMax. These programs have built-in thermodynamic models and equations that can handle complex mixtures and provide accurate results.

If you are still having trouble with convergence, it may be helpful to break down your calculations into smaller steps and check each step for accuracy. You can also try adjusting your initial guesses for the pressure and composition to see if that helps with convergence.

I hope this helps and if you have any further questions, please don't hesitate to reach out. Best of luck with your calculations!