Process Modeling Simulation & Control

2. How would you design and double pipe an exchanger? Under Input > Exchanger Geometry > Shells/Heads/Flanges > Shells/Heads you can select the shell type as Double Pipe (designated as “D-type”). .

1. Can you obtain a results report with the thermal and mechanical design combined? Currently, our Shell & Tube Thermal and Mechanical programs produce individual reports which you may tailor to your needs. .

Calculation Results .

8. What is the physical property file extension saved as? Case files are saved as .EDR files which contain all input and results for the case, including physical properties data. .

7. Where is the actual area vs. the required area reported on when rating an existing exchanger? You can find the area ratio on the Results Summary > Overall Summary form, and on the Thermal Hydraulic Summary > Performance form .

6. Where can I find the internal volume of a heat exchanger, Shell and Tube side, to calculate the necessary mass of the fluid? The Shell and Tube Mechanical program outputs the shell side or tube side volumes, as well as the Operating Weight (with the process fluids present). .

5. How can I send the calculated geometry back to Aspen HYSYS and/or Aspen Plus to be used in the simulation? When you have an EDR model, you can import it into a HYSYS Exchanger. Go to Design > Parameters and select Rigorous Shell & Tube as your Exchanger Model. Then, go to the Rigorous Shell & Tube tab and click the Import button. A file will appear. Open the dialogue box which allows you to browse a folder location where you select your case file “.EDR”. .

4. How can you have two outlet streams (flashed vapor and liquid) on one side of a Heat Exchanger? In Shell & Tube under Input > Exchanger Geometry > Nozzles you can select the option to have a separate liquid and vapor nozzle. You may also specify dimensions or have the program size these for you. .

3. How do you export heat exchanger process conditions from Aspen Plus to EDR? On a HYSYS Exchanger, go to Design > Parameters and select Rigorous Shell & Tube as your Exchanger Model. Then, go to the Rigorous Shell & Tube tab and click the Export button, which will then open a file. Save the file, choose a folder location, and name it as “.EDR”. .

2. Where does EDR put in supports (I'm talking about the extra supports option)? If you specify additional supports between tubes in window baffles, these are equally spaced between baffles. They will appear illustrated on the setting plan. Similarly, additional supports in inlet and outlet regions will be equally spaced between the first baffle and the tube sheet. .

1. When rating an existing exchanger, how do you change the way baffle cut is specified (% area vs. % diameter)? In the EDR Shell & Tube program, the baffle cut is expressed as a percentage of the shell inside the diameter. You will need to use a manual calculation from the figures expressed in the percent shell side net free area (taking account of the area occupied by the tubes) to convert to a % shell diameter basis. .

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19. What are the major differences between EDR and HTRI? How does the thermal design compare with HTRI models? AspenTech is unable to make direct comparisons of our offering to HTRIs; however, there are many benefits to using Aspen EDR. The webinar associated with this Q&A document focuses on several of these benefits, including: • Integration with Simulation: Aspen EDR models can be embedded in flowsheets from Aspen Plus & Aspen HYSYS—industry leading process simulators for both Chemicals, Oil, and Gas applications—improving flowsheets for revamp studies, troubleshooting operations, and debottlenecking processes. See the Petrofac Case Study for an example of how a customer benefitted from rigorous Aspen EDR models in Aspen HYSYS. • Physical Properties: Aspen EDR can import properties from Aspen Plus & Aspen HYSYS cases (as shown in the webinar) or properties can be specified using one of the included databanks: BJAC, Aspen Properties, or COMThermo. The integration and the breadth of the property databanks significantly reduce the time required to input process data. • Thermal Modeling: EDR thermal modeling is based on our HTFS research heritage from the late 1960s and continues with our current programs. This provides state of the art correlations and methods documented in the Aspen HTFS Research Network. The Research Network is licensed by many of our leading customers. We are regularly involved in analyzing comparisons between our results and those of other software suppliers. When called upon, we are always happy to demonstrate the validity of our methods with reference to sound theory and extensive validation data covering a wide range of exchanger configurations and process conditions. • Thermal Design Optimization: Aspen Shell & Tube typically evaluates hundreds of exchanger configurations considering the number of shells required, as well as details of shell geometry. The optimum design is selected on a rigorous algorithm for cost of labor and materials of construction. Similar optimization capabilities are also available in the Aspen Air Cooled Exchanger program. • Mechanical Design Optimization: Aspen Shell & Tube Mechanical is the only pressure vessel design product on the market that was developed exclusively for heat exchangers. Drawing on the long heritage of the B-JAC Teams program, Aspen Shell & Tube Mechanical provides powerful, optimized mechanical design that recognizes the interaction of key components. The designs produced minimize material thicknesses and reduce costs while still maintaining design integrity and conforming to internationally accepted code standards. • Thermal & Mechanical Integration: The integration between the thermal software and the mechanical software significantly reduces the time to hand off designs between thermal designers and mechanical engineers. .

18. Is there a separate package to the HTRI program that is already supplied by AspenTech? AspenTech does not supply HTRI software products; HTRI is a competitor. .

17. Does EDR have the ability to model condensers using differential heat curves? With the old B-JAC properties and VLE methods, you can specify differential condensation curves. It is normal to use the integral condensation method which has been proven to be accurate for a wide range of process conditions. Stream data transferred from the simulators is provided in integral VLE curves. .

16. Can the bend of the U-bundle be supported? Yes, you can specify a full baffle support and additional supports around the U-bend region itself. These can be very important in combatting flow induced vibration. .

15. Does the exchanger rating also take into account seasonal variations in temperature of the environment, as well as climatic variations of different countries? Within EDR, you can set up thermal models in Rating or Simulation modes for different operating conditions and track the results under Results > Results Summary > Recap of Designs. You may also find it very useful to use Aspen Simulation Workbook with EDR to conduct case studies of this nature with EDR working within Microsoft Excel. Visit the Support site and view Knowledge Base Item number 130667: Exploring multiple operating scenarios using Aspen Simulation Workbook and Aspen Shell & Tube Exchanger. With your EDR models embedded in an Aspen HYSYS or Aspen Plus simulation, you have a much more effective tool to study how an exchanger and the overall process will react to seasonal variations. .

14. Is dynamic modeling possible with EDR? Dynamic modeling is not supported in Aspen Exchanger Design & Rating. However, using the results of EDR sizing can help to achieve a more accurate dynamic model in Aspen Plus® and Aspen HYSYS®. .

13. If I have a two-phase case (two-phase on both sides), how can I check the Heat of Vaporization in the simulation? Can the EDR plot this? Under the Overall summary, you will find a tabulation of the breakdown of heat load for a two-phase case. Under Results > Calculation Details > Plots > Analysis Along Shell/Tubes you can view plots of specific enthalpy vapor fraction or heat load of the streams. .

12. How do you generate plots of S&T heat exchanger performance in EDR? Can you generate an overall schematic of several exchangers in series or parallel? In the new Shell & Tube Console temperature profile plots for shellside and tubeside are shown after each run. You can also view detailed output from the Aspen Shell & Tube incremental calculations under Results > Calculation Details > Analysis along the shell/ Analysis along the tubes. There is a tab available where you can view plats of temperature, pressure, heat transfer coefficients, vapor fraction etc. Currently there is no schematic of shells in series and parallel. .