Tutorials /Deaeration /Enthalpy

Up

Model Development

Accessing HYSYS

1. Open HYSYS using one of the following methods.

1.  Accessing from the Desktop:

• Double click on the HYSYS.Plant shortcut icon.

 

2.  Accessing using the Program menu:

• Click on Start Button

• Go to programs,
• then AEA Technology,
•  followed by HYSYS Plant 2.2.2 Build 3806,
•  and finally, HYSYS Plant (see Figure 1).

 

Figure 1: Accessing HYSYS Plant

After doing either of the above the HYSYS plant program will open. (A blank window opens).

2. Open a new case by using one of the following:

• Go to  the File menu, select New, followed by Case.
• Hold Down Ctrl N.
• Press the new icon located below file as shown in Figure 2.

Figure 2: Opening a new case

Selecting Fluid Package and Component

1. Once a new case is selected, a window opens which shows a Simulation Basis Manager. Click on the Add… button. This will open a window, Fluid Package: Basics-1, which shows all the Property packages that are available in the database.
2. In the list of Base Property Package, click on  ASME Steam.  By clicking on ASME steam, it becomes highlighted.
3. In the Fluid Package: Basics-1 window, there are  several tabs  located near the bottom of the window. Click on the tab that says Components.
4. The  ASME Steam package has only the properties for H₂O.  In the Components available from the.... Library box,  if there is more than one form of H₂O, select the row that contains  3 H₂O formulas. (On some computers, the other form might have been deleted.)
5. Press the Add Pure button, to add H₂O to the list of components.

Setting up the PFD

1. To enter the PFD, click on the Enter Simulation Environment icon.

                                  

In the simulation environment, one should find the PFD and the  object Palette open. The object palette contains shortcuts to some of the unit operations contained in HYSYS. While the PFD is where the operation are installed and modeled.

2. On the object palette, click on the  material stream icon.

3. After the material stream is selected,  click on the PFD. This will install the material stream on the PFD. By default, this stream should be named 1.

4. Note the color of the stream. The color should be light blue; this indicate that the stream is not solved.

Stream Specifications

1. Double click on stream 1. This will open up the stream  window.
2. On the Worksheet tab of the stream window, click on Composition.
3. In the composition view, one should see the  the component H₂O.  Click on the cell to the right and enter 1.  By entering 1, you will be defining the stream to be 100% H₂O.
4.  Click on  Conditions to go to the conditions page.
5. For the Mass Flow, enter 100 kg/hr. If the units of the mass flow are different, in the box in the upper right of the window, scroll the drop down menu for the  correct units. See Figure 3.

            Figure 3: Using the drop down menu to select units.

Setting Saturations Conditions

1. Click on Conditions to go to the conditions page.
2. In the cell to the right of  Vapor/ Phase Fraction, type 1 and then press enter. By entering 1, you are specifying that the stream is  100% vapor (saturated vapor).

Part a.

1. To answer part a. of the problem, enter 200 kPa for the pressure. (Use drop down menu to select the correct units.)
2. After the pressure is entered the stream should be solved. (The color of the stream should change to a dark blue on the PFD.)
3. On the Worksheet tab, click on Properties. (The numbers that you entered will be blue and those that are calculated will be black.)
4. In the list of properties, look for Mass Enthalpy.
5. When you have located Mass Enthalpy, click on the cell to the right.
6. Hold the cursor over the the selected cells. Note the numbers and units in the flag that appears.

Part b.

1. To answer part b. of the problem, we need to define the temperature and not the pressure.
2. Go to the Conditions page and select the Pressure cell.
3. Press the Delete key on the keyboard.
4. Enter the temperature of  350 °C in the Temperature cell.
5. Go to the Properties page and make a note of the Mass Enthalpy in the desired units.

Setting Superheated Conditions

Part c.

1. On the Condition page, delete the Vapor/ Phase Fraction number entered previously. To tell HYSYS that the stream is superheated, one does not need to specify the vapor fraction. (If one enters a vapor  fraction of say 0,  is saying that the stream is saturated.)
2. Enter the Temperature and Pressure of  750 °C and 1000 bar, respectively.
3. Go to the Properties page and make a note of the Mass Enthalpy in the desired units.

Saving

1. Go to the File menu.
2. Select  Save As.
3. Give the HYSYS file the name Enthalpy then press the OK button.