Fluid Package

This chapter begins by starting HYSYS and how to select the right components and fluid package for simulation pmposes. Knowing how to start HYSYS and get familiar with its desktop is very important in this chapter. The second part is about how to enter and re-enter the simulation enviromnent, and get familiar with simulation flowsheet. In this part, users will be informed some important features of HYSYS. The last part is dealing with how to add and specify material streams for simulation. Variables specification is one of the important steps that users need to understand when dealing with HYSYS. 

Before any simulation can occur, HYSYS needs to imdergo an initial setup. Dining an initial setup, the components and the fluids package that will be used will be selected. 

Aspen HYSYS used the concept of the fluid package to contain all necessary information for performing flash and physical property calculations. This approach allows you to define all information (property package, components, hypothetical components, interaction parameters, reactions, tabular data, etc.) inside a single entity. 

Fluid packages can be stored as completely defined entities for use in any simulation. 

Multiple Fluid Packages can be used in the same simulation. However, they are defined inside the common Basis Manager. 

The Simulation Basis Manager is property view that allows you to create and manipulate multiple fluid packages or component lists in the simulation. 

Once you have specified the components present in your simulation, you can now set the fluid package for your simulation. The fluid package is used to calculate the fluid/thermodynamic properties of the components and mixtures in yoiu simulation (such as enthalpy, entropy, density, vapour-liquid equilibriiun etc.). Therefore, it is very important that you select the correct fluid package since this forms the basis for the results returned by your simulation. 

Click the Add button to create a new fluid package as shown below ... 

From the list of fluid packages, select the desired thermodynamic package. The list of available packages can be narrowed by selecting a filter to the left of the list (such as EOSs, activity models etc.). 

You can give yom fluid package a name at the bottom of the fluid package screen... 

Once this is done, close the window by clicking on the red X on the upper right hand corner of the Fluid Packages window. 

Once you have specified the components and fluid package, and entered the simulation environment, you will see the view as shown in Figiue 1-7. Before proceeding, you should taking care of a few features of this simulation window ... 

The first step in building any simulation is defining the fluid package. A brief review on how to define a fluid package and install streams is described below. For a complete description, see the previous chapter (Chapter 1 Starting with HYSYS). 

Enter the following values in the specified fluid package view ... 

This should take you to the Fluid Package window. Click on the Prop Pkg tab. 

Compare the result using two different fluid packages Soave-Redlich-Kwong and Peng-Robinson. 

Pumps are used to move liquids. The pump inereases the pressure of the liquid. Water at 120°C and 3 bar is fed into a pump that has only 10% efficiency. The flowrate of the water is 100 kgmole/h and its outlet pressure from the pump is 84 bar. Using Peng-Robinson equation of state as a fluid package, determine the outlet temperature of the water. 

Click the Hypothetical menu item in the Add Component box to add a hypothetical component to the Fluid Package... 

When the hypo component has been defined, return to the fluid package by closing... 

You have now finished defining the fluid package. Click the Enter Simulation Environment button when you are ready to start building the simulation. 

---