Exchangers

Heater

The Heater is used to simulate the heating process of a material stream.

The heater model have following connection ports:

• Two Material Streams: feed and outlet stream
• One Energy Stream: heat added

Following calculation parameters must be provided to the heater:

• Pressure Drop Pdel
• Efficiency Eff

The above variables have been declared of type parameter Real. During simulation, their values can specified directly under Heater Specifications by double clicking on the heater model instance.

In addition to the above parameters, any one additional variable from the below list must be provided for the model to simulate successfully:

• Outlet Temperature Tout
• Temperature Increase Tdel
• Heat Added Q
• Outlet Stream Vapor Phase Mole Fraction xvapout

These variables are declared of type Real. During simulation, value of one of these variables need to be defined in the equation section.

Simulating a Heater

1. Create a package named Heater

2. Create a model named MS inside Heater. This is to extend MaterialStream model

3. Extend the model MaterialStream and necessary property method from ThermodynamicPackages

   extends Simulator.Streams.MaterialStreams;
   extends Simulator.Files.ThermodynamicPackages.RaoultsLaw;
   

4. Create another new model named HeaterSimulation

5. Similar to the MaterialStream example model, import ChemsepDatabase and create variables for the compounds which are to be used from ChemsepDatabase

   import data = Simulator.Files.ChemsepDatabase;
   parameter data.Methanol meth;
   parameter data.Ethanol eth;
   parameter data.Water wat;
   

6. Define variables for Number of components Nc and component array C. Also assign the variables created for the compounds to the component array

   parameter Integer Nc = 3;
   parameter data.GeneralProperties C[Nc] = {meth, eth, wat};
   

7. Now, create three instances of the MaterialStream model MS as we require one material stream which will go as input and two material streams which will come as output. To do this, open diagram view of HeaterSimulation model, drag & drop MS teice as shown in fig. Name the instances as S1 and S2.

   

8. Now, drag and drop the Heater model available under UnitOperations. Name the instance as B1

   

9. Now, drag and drop the EnergyStream model available under Streams. name the instance as E1.

10. Now double click on S1. Component Parameters window opens. Go to Stream Specifications tab. There are two parameter Nc and C for which the values are to be entered. As the value for Nc and C are already declared earlier in step 6 while defining the variables, these variables are passed here instead of the values. Repeat this for the other material streams.

    

11. Now double click on B1. Component Parameters window opens. Go to Heater Specifications tab and enter the values for parameters as mentioned below:

    • Nc and C can be entered same as material stream

    • Pdel represents the pressure drop across the heater. As per the problem statement, enter Pdel as 101325.

    • Eff represents the heater efficiency. As per the problem statement, enter Eff as 1.

      

12. Switch to text view. Following lines of code will be autogenrated

    Simulator.Examples.Heater.MS S1(Nc = Nc, C = C) annotation( ...);
    Simulator.Examples.Heater.MS S2(Nc = Nc, C = C) annotation( ...);
    Simulator.UnitOperations.Heater B1(C = C, Eff = 1, Nc = Nc, Pdel = 101325)  annotation( ...);
    Simulator.Streams.EnergyStream E1 annotation ( ...);
    

13. Now, connect the streams with unit operations. For this, switch back to Diagram view.

    

14. Switch to text view. Following lines of code will be autogenrated under equation section

    connect(E1.Out, B1.En) annotation( ...);
    connect(B1.Out, S2.In) annotation( ...);
    connect(S1.Out, B1.In) annotation( ...);
    

15. Specify the pressure, temperature, component mole fractions and molar flow rate for the inlet material stream

    S1.x_pc[1, :] = {0.33, 0.33, 0.34};
    S1.P = 202650;
    S1.T = 320;
    S1.F_p[1] = 100;
    

16. Now specify one of the variables mentioned earlier during model explaination to satisfy the degrees of freedom. As per the problem statement, amount of heat added is to be specified.

    B1.Q = 2000000;
    

17. This completes the Heater package. Now click on Simulate button to simulate the HeaterSimulation model. Switch to Plotting Perspective to view the results.

Note

You can also find this package named Heater in the Simulator library under Examples package.

Cooler

The Cooler is used to simulate the cooling process of a material stream.

The cooler model have following connection ports:

• Two Material Streams: feed and outlet stream
• One Energy Stream: heat added

Following calculation parameters must be provided to the cooler:

• Pressure Drop Pdel
• Efficiency Eff

The above variables have been declared of type parameter Real. During simulation, their values can specified directly under Cooler Specifications by double clicking on the cooler model instance.

In addition to the above parameters, any one additional variable from the below list must be provided for the model to simulate successfully:

• Outlet Temperature Tout
• Temperature Drop Tdel
• Heat Removed Q
• Outlet Stream Vapor Phase Mole Fraction xvapout

These variables are declared of type Real. During simulation, value of one of these variables need to be defined in the equation section.

Simulating a Cooler

1. Create a package named Cooler

2. Create a model named MS inside Heater. This is to extend MaterialStream model

3. Extend the model MaterialStream and necessary property method from ThermodynamicPackages

   extends Simulator.Streams.MaterialStreams;
   extends Simulator.Files.ThermodynamicPackages.RaoultsLaw;
   

4. Create another new model named CoolerSimulation

5. Similar to the MaterialStream example model, import ChemsepDatabase and create variables for the compounds which are to be used from ChemsepDatabase

   import data = Simulator.Files.ChemsepDatabase;
   parameter data.Methanol meth;
   parameter data.Ethanol eth;
   parameter data.Water wat;
   

6. Define variables for Number of components Nc and component array C. Also assign the variables created for the compounds to the component array

   parameter Integer Nc = 3;
   parameter data.GeneralProperties C[Nc] = {meth, eth, wat};
   

7. Now, create three instances of the MaterialStream model MS as we require one material stream which will go as input and two material streams which will come as output. To do this, open diagram view of HeaterSimulation model, drag & drop MS teice as shown in fig. Name the instances as S1 and S2.

   

8. Now, drag and drop the Cooler model available under UnitOperations. Name the instance as B1

   

9. Now, drag and drop the EnergyStream model available under Streams. name the instance as E1.

10. Now double click on S1. Component Parameters window opens. Go to Stream Specifications tab. There are two parameter Nc and C for which the values are to be entered. As the value for Nc and C are already declared earlier in step 6 while defining the variables, these variables are passed here instead of the values. Repeat this for the other material streams.

    

11. Now double click on B1. Component Parameters window opens. Go to Heater Specifications tab and enter the values for parameters as mentioned below:

    • Nc and C can be entered same as material stream

    • Pdel represents the pressure drop across the cooler. As per the problem statement, enter Pdel as 0.

    • Eff represents the cooler efficiency. As per the problem statement, enter Eff as 1.

      

12. Switch to text view. Following lines of code will be autogenrated

    Simulator.Examples.Heater.MS S1(Nc = Nc, C = C) annotation( ...);
    Simulator.Examples.Heater.MS S2(Nc = Nc, C = C) annotation( ...);
    Simulator.UnitOperations.Cooler B1(Pdel = 0, Eff = 1, Nc = Nc, C = C)  annotation( ...);
    Simulator.Streams.EnergyStream E1 annotation ( ...);
    

13. Now, connect the streams with unit operations. For this, switch back to Diagram view.

    

14. Switch to text view. Following lines of code will be autogenrated under equation section

    connect(E1.Out, B1.En) annotation( ...);
    connect(B1.Out, S2.In) annotation( ...);
    connect(S1.Out, B1.In) annotation( ...);
    

15. Specify the pressure, temperature, component mole fractions and molar flow rate for the inlet material stream

    S1.x_pc[1, :] = {0.33, 0.33, 0.34};
    S1.P = 101325;
    S1.T = 353;
    S1.F_p[1] = 100;
    

16. Now specify one of the variables mentioned earlier during model explaination to satisfy the degrees of freedom. As per the problem statement, amount of heat removed is to be specified.

    B1.Q = 2000000;
    

17. This completes the Cooler package. Now click on Simulate button to simulate the CoolerSimulation model. Switch to Plotting Perspective to view the results.

Note

You can also find this package named Cooler in the Simulator library under Examples package.

Heat Exchangers

Simulating a Heat Exchanger