How is the compressibility factor (Z) calculated in PRO/II?
There are two calculations for the compressibility factor Z. Both can be found in PRO/II output reports, but only one has any physical meaning. The Z from density calculation is:
There are two calculations for the compressibility factor Z. Both can be found in PRO/II output reports, but only one has any physical meaning. The Z from density calculation is:
Z = PV/ rho T
where rho is actual density.
The Z from K-value is:
Z = PV / rho T
where rho is "density" calculated during the K-value calculations. This rho is an intermediate result from the EOS calculations and in general is not a good value for the actual density.
About PRO/II: PRO/II is the major product in the Process Engineering Suite (PES). This process simulation software optimizes plant performance by improving process design, operational analysis, and performing engineering studies. It is designed to perform rigorous heat and material balance calculations for a wide range of chemical processes. PRO/II allows users to evaluate the use of heat integration with case studies, rigorously evaluate process improvements with the help of a process flow diagram (PFD), or model crude distillation units. PRO/II offers a wide variety of thermodynamic models to virtually every industry and is incredibly cost effective, decreasing both capital and operating costs.
Technical Support: As always, feel free to reach out to your local technical support team for more information.
About PRO/II: PRO/II is the major product in the Process Engineering Suite (PES). This process simulation software optimizes plant performance by improving process design, operational analysis, and performing engineering studies. It is designed to perform rigorous heat and material balance calculations for a wide range of chemical processes. PRO/II allows users to evaluate the use of heat integration with case studies, rigorously evaluate process improvements with the help of a process flow diagram (PFD), or model crude distillation units. PRO/II offers a wide variety of thermodynamic models to virtually every industry and is incredibly cost effective, decreasing both capital and operating costs.
Technical Support: As always, feel free to reach out to your local technical support team for more information.
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