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Problem Statement: How do I force the simulation to solve from within my Extension Unit Operation? | Solution: Add a new sub procedure named VariableChanged to the unit operation extension class module. This procedure will be called whenever a variable in the extension is changed. An InternalVariableWrapper object is passed to it as an argument. This object is used to identify the name of the variable and take an appr... |
Problem Statement: How is the Heat Transfer Area per Shell value calculated? | Solution: The area is calculated per shell branch. If you have two parallel branches of four shells in series, the area displayed in HYSYS corresponds to the shells in series. For the overall area you would have to mulitply this number by the number of parrallel branches you have.
Keywords: Heat Exchanger, Heat Transfe... |
Problem Statement: Can I access PFD Objects via Automation? | Solution: HYSYS exposes all the objects on the PFD (streams, operations, labels, tables ...) via Automation. All the manipulations that are possible within the interface (movement, rotation, mirroring, hiding, unhiding ...) can be accomplished through code.
The key object types are
PFD- The HYSYS PFD
PFDItems - A colle... |
Problem Statement: What does the Pump acting as a Turbine checkbox do in Aspen HYSYS? | Solution: When this box is checked, Aspen HYSYS changes how it handles the energy and efficiency equations for the pump operation. This box should be checked when you use the pump to extract energy from a liquid by decreasing its pressure. As opposed to the more traditional use of the pump operation, which is to add en... |
Problem Statement: Can I check for <empty> values using a HYSYS spreadsheet? | Solution: Internally HYSYS represents any value which is <empty> as -32767. The HYSYS @if function can be used to check for this value. This has the syntax @if(Logical Test, Value if True, Value if False)
For example if cell A1 contained an imported value, then the following formula would test whether this value ... |
Problem Statement: What is the meaning of error message 'Depressuring - Dynamics-1 is unable to calculate because Separator Vessel is not complete. Please solve the sub-flowsheet completely first and then press the Calculate button.'? | Solution: When this error message is received, return to the Main flowsheet. To return to the main flowsheet environment press the upward pointing green arrow button in the main button bar until Case (Main) appears at the top right of the HYSYS window, or go to Simulation ... Main Properties and press the 'Main Environ... |
Problem Statement: Is it possible to override the default values for pure component properties of library components in HYSYS? | Solution: Yes. Starting from HYSYS version 3.0, users are able to edit/modify the properties of traditional HYSYS library components, as well as hypothetical components. Please note that Electrolyte component properties are specified by OLI Systems and therefore not user-modifiable.
You can edit/modify component proper... |
Problem Statement: How do I include a Diesel (CAS 68334-30-5) component in a simulation? | Solution: Even though Diesel can be found with CAS number 68334-30-5, Diesel is not one specific chemical component but a mixture of components which are separated into ranges by their boiling point. That's why it is not found in the databank as It cannot have specific properties like molecular weight etc.
In case, use... |
Problem Statement: Unexplained DLLs and TGZ files are created when opening simulation files. Example of files appear are:
lsprst7.dll, lsprst7.tgz, tmpPrst.tgz, sysprs7.dll, sysprs7.tgz | Solution: Installed version of SLM Client tools is not capable of handling Window 7 security requirements. To resolve the issue Uninstall SLM Client tools 7.3 then install SLM Client tools 8.4 from Aspen Engineering DVD 1 for 32 bit systems
Un-install SLM Client tools 7.3
Click on Start | All Programs | AspenTech | U... |
Problem Statement: How can someone rotate or flip a stream or a unit operation to improve the aesthetics of the PFD? | Solution: There are a few ways to do this:
The user can just do right click on the stream or unit operation and select the Transform menu. Then select the desired option, i.e. rotate the icon or mirror about X or Y axis.
Another alternative would be to use one of the shortcuts available within HYSYS.
Depending on the... |
Problem Statement: Are the velocities reported in the HYSYS pipe segment Actual or Superficial velocities? | Solution: The phase velocities reported in the HYSYS pipe segment are the Superficial velocities.
[This data can be accessed from the Performance Tab by pressing the View Profile Button.]
They are calculated using:
Phase Velocity = Phase Volumetric Flow / Pipe Area
In order to calculate the phase actual velocity the ar... |
Problem Statement: Can I change the font size of X & Y-axis labels in Strip Chart? | Solution: You cannot change font size directly in Strip Chart by selecting Graph Control.
Procedure:
Tools/Preferences/Resources/Fonts
Please select Selecting Custom Font tab afterwards select size.
Afterwards come back to Stripchat & look at X-Axis and Y-Axis labels.
Keywords: Stripchart, fontsize, graph control, labe... |
Problem Statement: HYSYS warns me that my Heat Exchanger has a Ft Correction Too Low - what does it mean? | Solution: The Ft factor (LMTD Correction Factor) is related to the shell & tube configuration (shell/tube passes). As a practical economic consideration, it is seldom that a configuration should be chosen where Ft is less than about 0.8. HYSYS generates a warning if the Ft factor for a given heat exchanger is below 0.8... |
Problem Statement: Is it possible to display a user variable in the Workbook? | Solution: Beginning with V7.2, it is possible to display User Variables in the Workbook. The procedure to add a User Variable is the same as adding other variables, as described below:
1. With the Workbook window active use the Workbook | Setup menu option
2. Press the Add button in the Variables group to bring... |
Problem Statement: The 3-phase separator horizontal vessel correlation considered fixed nozzle location for Aspen HYSYS V7.3 and older versions. See KB | Solution: 132364. This has been enhanced in Aspen HYSYS V7.3.1.Solution
In Aspen HYSYS V7.3.1, the feed nozzle location has an impact on gas-liquid carrryover when the Horizontal Vessel correlation is used, just as works in the case of ProSeparator correlation.
In addition, a check is performed to ensure the feed nozz... |
Problem Statement: Why do I get high CPU usage for REXECD.exe on a client machine? | Solution: This issue occurs when Hysys or Basic Engineering products are installed on a client machine using the 'Server' option. This can cause the system to be slow or have performance issues. To work around this turn the Windows Service off and\or disable it.
- In Windows 2003/XP - Go to Start | (Settings) | Control... |
Problem Statement: Is there an easy way to tell which streams have which dynamic specs? | Solution: Yes, this can be done by changing the colour scheme of the PFD.
In Aspen HYSYS v3.0.1 and below:
The Dynamic specs colour scheme is not present by default so you will have to add it. To add it, follow the instructions in the viewlet below. To view the viewlet, unzip the file to folder on your hard disk and do... |
Problem Statement: I have some unit operations in my Aspen Hysys subflowsheet, but they don't show up in the project component map preview list | Solution: When using Activated Economics feature inside Aspen Hysys, all unit operations are mapped to Aspen Process Economic Analyzer (APEA) process equipment, in order that they may be sized and costed. This is done automatically by APEA, when the user selects the 'mapping' function in the Economics toolbar of the As... |
Problem Statement: Why is the Heat Duty reported by the Heat Exchanger in Aspen HYSYS not corresponding to Q = mCpdT? | Solution: The heat duty of a heat exchanger operation in Aspen HYSYS is calculated based on the enthalpy difference between the feed and product streams. Heat capacity Cp is not used since its value is not constant during heat transfer processes. Hence the formula Q=mCpdT is not used, instead duty is calculated as:
Hea... |
Problem Statement: Can I set Component Splitter TBP Cut points by Automation? | Solution: Attached below is some example VBA code to illustrate how to do this. You may have noticed that the component splitter does not have an entry in the HYSYS object library - it has not yet been wrapped for simple access via OLE so there is no easy way to access it's properties. However it is possible to access ... |
Problem Statement: How do I get or set the Std Ideal Liquid Volume Flow of a stream? | Solution: [In previous HYSYS versions this property appeared on the Worksheet ... Conditions tab as Liquid Volume Flow]
The appropriate property of the ProcessStream object is IdealLiquidVolumeFlow the following code sample illustrates this
Public Sub LiqVolFlow()
'Declare Variables
Keywords: None
References: None |
Problem Statement: How do I print tray by tray properties plots? | Solution: You can print tray by tray properties in graphical format at a time for that particular column.
In order to get best view please make below settings:
1. Using the attached file, double click on the Depropanizer column then go to the Performance tab and select Plots/Tray by Tray properties.
2. Select T... |
Problem Statement: How is the total heat transfer area calculated by detailed heat loss model in Dynamic - Depressuring utility? | Solution: The contribution of the metal wall to the heat losses is only taken into account if Detailed is selected as Heat Loss Model in the Heat Flux page. The total heat transfer area for Detailed heat loss model is sum of cylindrical area, top head area and bottom head area.
Total Heat Transfer Area = Cylindrical Ar... |
Problem Statement: What is the best way to rigorously model a column with a thermosyphon in which 2 liquid phases could be encountered? | Solution: In current versions, HYSYS enables the selection of a thermosyphon reboiler instead of a kettle for a given column. However, the process diagram used for modeling of the thermosyphon is not supported by all theSolution algorithms, the Sparse Continuation Solver being one of the limitations.
When you expect yo... |
Problem Statement: Streams connecting two consecutive stages can be exported to main flowsheet from column property view | Flowsheet | Internal Streams | Add command. For other interior streams, a user can follow the technique described below to export the stream to main flowsheet. | Solution: In thisSolution, we present a general applicable scheme to export an internal stream from column subflowsheet to main flowsheet.
It is always possible to replace a material stream with one stream to a TEE (with two outlets) and one stream from the TEE. As long as the other outlet of the TEE has a negligible f... |
Problem Statement: Why can?t I rate a valve in HYSYS? Is this option included in Steady State? | Solution: On earlier releases, HYSYS did not include the option to rate the valves in steady state (i.e. define C1, Cv or K and opening percentage and calculate pressure drop), but starting with V7.3 this option is included.
The following scenarios are supported:
a. Mass Flow and P2 (downstream) are known, P1 could... |
Problem Statement: How does one view process utility consumption in Aspen HYSYS? | Solution: The Aspen HYSYS Process Utility Manager lets you define and apply utility tags to material and energy streams, to designate them for calculation of energy and utility consumption and costs.
User can view overall Utility consumption data per utility tag, or User can view data for each utility at the stream lev... |
Problem Statement: Validation of water content in natural gas calculations by Peng-Robinson property method in Aspen HYSYS . | Solution: Predictions of water content in natural gas by Peng-Robinson property method are very good. Results are validated against GPSA and experimental data.
Results are compared against
1. Experimental data from Olds, Sage and Lacey, Phase Equilibria in Hydrocarbon Systems. Composition of Dew-Point Gas in Metha... |
Problem Statement: How does one use the Electrolyte NRTL model in Aspen HYSYS? | Solution: 1). From Simulation Basis Manager Components/Databank select Aspen Properties then add only molecular species.
2). Create a Fluid Package then select Aspen Properties then select Property Package as Electrolyte NRTL.
3) Click on the Electrolyte Wizard button.
4). In the ensuing window, include the water di... |
Problem Statement: How can I export a HYSYS workbook to Excel? | Solution: You have a number of options here. The simplest one would be to use the Text To File option. This saves the data from the workbook in a comma delimited ascii text file which can then be opened and formatted in Excel. To do this, open the workbook and select File - Print from the main toolbar. When the print d... |
Problem Statement: In MASSBAL, you could define streams as Chemical, VLE, Fluid, Food, or Pulp. What stream definition is supported in the MASSBAL subflowsheet in HYSYS? | Solution: MASSBAL has many different possible stream definitions (e.g. Chemical, VLE, Fluid, Food, Pulp). However, the only one used in HYSYS will be the VLE stream type. Thus, in order for MASSBAL to use HYSYS to perform its thermodynamic calculations, callback functions have been set up. We have callback functions to... |
Problem Statement: Why do old Dynamic Depressuring utility cases return different results when loaded in Aspen HYSYS V7.3 CP1 (or newer)? | Solution: Some changes have been implemented in Aspen HYSYS V7.3 with CP1 and within the Aspen HYSYS dynamic depressuring utility. When the inlet stream is pure vapor (V/F =1), the liquid level will not be allowed to be specified and will be defaulted to zero.
In earlier versions, Aspen HYSYS allowed the specificatio... |
Problem Statement: How do I tell HYSYS to use the steam tables property package (NBS or ASME) when I have other components besides water in my case? | Solution: The heat exchanger operation allows the shell and tube sides to be solved using 2 different property packages. To tell the shell side to use NBS (or ASME), you must create two Fluid Packages and a sub-flowsheet and in the Basis Environment associate the subflowsheet to use the steam table property package.
St... |
Problem Statement: How does Aspen HYSYS depressuring perform with respect to the experiment and the BLOWDOWN simulator? | Solution: The Aspen HYSYS Depressuring Utility predictions are validated against experimental data reported in the literature for three experiments originally intended to test the capabilities of the BLOWDOWN? simulator [1]. The experiments were carried out in an order that reflects an increasing degree of difficulty: ... |
Problem Statement: What are the definitions of the pressure types for the Aspen HYSYS Dynamics PSV valve? | Solution: Set pressure is when valve starts to open. The inlet static pressure rises above the set pressure of the safety valve, the disc will begin to lift its seat. let say the set pressure is 10 bars. If the inlet pressure is higher than 10 bars then the valve starts to open.
Full open pressure is when the valve is ... |
Problem Statement: What is new for the Component Splitter in Aspen HYSYS? | Solution: The new Component Splitter is still based on the material balance on each component, but the theory has been extended to handle the two split types Fraction in Products and Flow in Products. In addition splits can be specified on bottom stream as well and splits for overhead can be calculated.
Theory:
The Com... |
Problem Statement: How do I get around the problem of products not being at equilibrium conditions? | Solution: The use of tray efficiency is the main reason for products not being at equilibrium. If the draw tray is set to 100% efficiency, its products will be in equilibrium with each other.
In columns with large number of of trays (~10 or more actual trays), this approach will not affect the accuracy of the model, ... |
Problem Statement: How are the compressor (and expander) Isentropic and Polytropic exponents calculated? | Solution: The Isentropic Exponent (k), and Polytropic Exponent (n) are calculated by the Hysys compressor as follows:
k = log (Pout / Pin) / log (density-out ideal / density in)
n = log (Pout / Pin) / log (density-out actual / density in)
Where in and out signify the inlet and outlet streams, and P is the stream pressu... |
Problem Statement: In Aspen Hsysy V7.2 and V7.3 Installation guide, only Multiflash V3.8 is supported. But the latest version of Multiflash is currently V4.0. Is the latest version V4.0 is applicable to HYSYS V7.2 and V7.3? | Solution: The Hysys Multiflash interface automatically takes are of the Multiflash version, provided that Multiflash install creates the correct registry key. The key we are looking for are:
HKCU\Software\Infochem\Multiflash\COMTHERMO
Or
HKLM\Software\Infochem\Multiflash\COMTHERMO
Starting with version 4.0 th... |
Problem Statement: How can I achieve a ''PFD1 to PFD2 cross PFD feeder connector? If I want to use a product stream of an existing PFD as the feeder stream of a new PFD, and the two PFDs are linked through this ''across PFD stream''? | Solution: You can add a new PFD first.
Do not clone from the existing PFD.
Then delete any stream you want to link from the existing PFD, and re-add it again.
You will see the newly created PFD will contain this stream as well. And this stream is synchronized among all the PFDs.
Now you can start adding the downstream ... |
Problem Statement: How is Mass Flow converted into the Std. Gas Flow [STD_m3/h] variable reported in the ‘Properties’ page of any stream in Aspen HYSYS? | Solution: The Std. Gas Flow is calculated from the specified or calculated mass flow, according to the Ideal Gas law at standard conditions (1 atm, 15 deg. C):
IdealDens = p0 Mw / (R T0)
where,
p0 – pressure at standard conditions (Pa)
Mw – gas molecular weight (kg/kmol)
R – ideal gas constant (8.314 J/mol/K)
T0 ... |
Problem Statement: Pressure assignment in a mixer is either ‘Equalize all’ or ‘Set Outlet to Lowest Inlet’. Thus, the pressure of the mixed stream is either the lowest of all inlets, or all streams have the same pressure. The user may wish to mix a lower pressure stream to others at higher pressure, and have th... | Solution: Instead of using a Mixer, the user should use the Balance operation of ‘Component mole and heat flow’ and assign the desired pressure value to all streams connected.
Keywords: Balance, Mixer, Pressure
References: None |
Problem Statement: Why the component specification in the column changes after modification of the component list? | Solution: When a component specification is added in the column, the component is taken from the array index in the component list. The column specification then uses this index. If the component list is re-ordered or a component is deleted from the list or a new component added in the list then the component in the or... |
Problem Statement: How do I restrict what values the user can enter into a User Variable? | Solution: For example, how do I prevent negative lengths?
The VariableChanging procedure allows the programmer to check what value the user is entering and if necessary to reject it using the AllowThisChange property.
The following example illustrates the use of this procedure.
Sub VariableChanging()
If ActiveVariableW... |
Problem Statement: Can I use DIPA with the Amine Package in HYSYS 3.0.1? | Solution: Yes, as with previous versions, DIPA is a supported component in the Amines package. With HYSYS 3.0.1, you need to be careful about how you select this component. Simply typing DIPA in the match cell will lead you to select DIPropylAmine, which is not a supported component. Typing DIsoPAmine instead will sele... |
Problem Statement: Why is the Energy Analysis button greyed out in Aspen HYSYS? | Solution: Starting from V8.0, Aspen HYSYS users are able to see activated Energy Analysis button showing above the PFD flowsheet, which facilitates the data extraction from HYSYS to Aspen Energy Analyzer.
However, sometimes this button is greyed out. When this happens, please check the following on the Navigation Pane:... |
Problem Statement: How is the K factor in the Pipe Segment calculated in Aspen HYSYS v2.4.1 and above? | Solution: In versions of Aspen HYSYS older than version 2.4.1 (recently released version), the pressure drop through the fitting was calculated as delP = 1/2*rho**K*V^2. The K factor was also referred to as the Velocity Head factor. The values for the K factor used in the database for HYSYS version before 2.4.1 were ba... |
Problem Statement: What does the Take Partial Steps option do in the recycle logical operation? | Solution: The option of Take Partial Steps will pass/update information as it is available. Not using the Take Partial Steps should only pass information / update the recycle once the full feed stream is solved.
If this option is used on the recycle it will solve every time even if the the attached feed stream is not... |
Problem Statement: Does the HYSYS.INI file stop HYSYS from looking for other keys if it finds that the licenses are taken up on that keyserver? | Solution: Not necessarily. HYSYS will search within sub-nets. If there are two keys of the correct family code in the sub-net, HYSYS will contact the one with the IP address in the HYSYS.INI first, but it will still look for another key it if finds this first key's licenses are in use. If it finds one within the sub-ne... |
Problem Statement: Can I set Tee splits via Automation? | Solution: Yes, the attached VBA code example will set the split fraction for the first outlet stream of a Tee called 'TEE-100' on the main flowsheet of the currently open case. The code is set up to be run from VBA (e.g. in Excel) but also includes the line necessary to link to the active case in the HYSYS Macro Langua... |
Problem Statement: Why are some objects in my PFD shown in gray, even though the flowsheet appears to be solved? | Solution: The objects have been selected for sizing (right click on PFD icon and choose Select For Sizing) This relates to an old HYSYS feature that has been superseded by the integration of Aspen Economic Analyzer.
Selecting an object for sizing will not affect the simulation results in any way, however it does limit ... |
Problem Statement: How do I use the TBP Cut Point page of the Component Splitter? | Solution: The modification is to allow the user to specify compositions of the product streams by giving the TBP Cut Point between the streams, assuming sharp separation at the cut point.
So, what should the user specify and how should it work?
Should be able to specify the initial TBP Cut Point on Feed (ICP) for each ... |
Problem Statement: How may I count streams and operations in a HYSYS case? | Solution: The attached MS Excel sheet calculates the number of objects in the HYSYS active case. It prints the results in a text file with the same name as the case (with the extension .txt), and breaks the counted objects down by object type. It also prints the date and time in the file as well as the case name and pa... |
Problem Statement: How do I get HYSYS and STX (ACX) linked or how do I export HYSYS data to STX (ACX) and vice versa? | Solution: If you are installing HYSYS and/or STX for the first time on your desktop then it is best to register the STXHYSYS.dll file within HYSYS in order to get the two programs linked. This is assuming that both HYSYS and STX were installed successfully, an STX key is on the desktop (or a STX network license availab... |
Problem Statement: If I include the outer Heat Transfer Coefficient, why is the calculated overall Heat Transfer Coefficient smaller than if I exclude the outer Heat Transfer Coefficient? | Solution: The reason you are seeing such a big difference in the overall Heat Transfer Coefficient when you do not check the Include outer HTC checkbox is because HYSYS has no knowledge about the outer Heat Transfer Coefficient, so a fixed internal default value for the outer Heat Transfer Coefficient is used that has ... |
Problem Statement: Head loss under downcomer is too large란 애러메시지는 무엇을 뜻하는가? | Solution: 이 메시지는 downcomer head loss값이 너무 크다는 뜻이다. 결과값은 Tray Sizing Utility를 실행한 후, Performance | Trayed | Trayed Results | Downcomer 에서 DC Head Loss에서 볼 수 있다. Head Loss계산에 영향을 주는 주요 요소로는 Downcomer Clearance이다. 이 메시지를 제거하려면, Design | Tray Internals | Downcomer Clearance(기본값 1.500)을 메시지가 없어질때까지 줄이면 된다.
Please find theS... |
Problem Statement: How to model Hydrotreater bed in Aspen HYSYS Petroleum Refining | Solution: The Hydrocracker within RefSYS can be used to model either a hydrocracker or a hydrotreater. From a modeling standpoint, the only difference between the two is that the cracking and ring-opening rates for a hydrotreater are much lower than they are for a hydrocracker. Typically, a hydrocracker will have a few... |
Problem Statement: In a dynamic model I have a spreadsheet that changes the composition of a feed stream, but the composition keeps flipping between the old and new values. What is happening? | Solution: Every feed stream has a Feeder Block, which is a holder for composition and conditions of the stream. This is used to make sure the stream composition and conditions are recovered after a case of flow reversal, where the stream acts as a product stream and gets its conditions and composition from the downstre... |
Problem Statement: What is a 'Forget' Pass? | Solution: HYSYS unit operations can calculate product variables based on feed variables, feed variables based on product variables, or a combination of the two. This can lead to very complicated interdependency between the variables in a flowsheet. When a variable is changed, HYSYS must first forget all of the variable... |
Problem Statement: What does the error message 7 mean? No Dongle. Make sure that the hard lock is attached to the parallel port or that the hardlock server is up and running. Check the connection and select retry to continue.. How do I get rid of it? | Solution: If you are trying to open a HYSYS case that contains heat exchangers that have been rated or designed by STX, HYSYS will try to set up the STX-HYSYS link. You need both the HYSYS and the STX keys. The STX key is not being found and this is the reason why you get the error message. If you want to work with the... |
Problem Statement: Can MASSBAL solve backwards? Do all feed streams in MASSBAL have to be specified? | Solution: Solving Backwards:
One of the constraints of MASSBAL using VLE streams is that ALL source streams have to be specified. This means all source streams in the MASSBAL flowsheet have to be fully specified (Phase Rule has to be satisfied for each stream) as well. Specifications can be (judiciously) made elsewhere... |
Problem Statement: How are the K factors in the fittings.db file used? | Solution: The fittings K factor is not proportional to flow i.e. there is no account taken of friction - for fittings it is usually acceptable to have a zero length.
However, future plans include a fitting database where the k factor term would take into account the flow of the fluid, and this is being addressed by a n... |
Problem Statement: What is XML? | Solution: XML is the official acronym for the Extensible Markup Language. XML is a language that uses contextual tags to describe data so that other applications and tools can correctly read the data and do interesting things with it. Now, XML is more than just a markup language, as it has become synonymous with a fami... |
Problem Statement: Can HYSYS calculate exergy? | Solution: HYSYS does not include exergy flow in its default calculations. However, you can use the flexible customization capability of HYSYS to incorporate exergy calculations into your flowsheet.
What HYSYS provides are the values of enthalpy and entropy at the specified states for pure substances or mixtures. Since ... |
Problem Statement: How to use Shell & Tube Exchanger Design/Rating Utilities to get results from Aspen Shell & Tube Exchanger in Aspen HYSYS? | Solution: 1. Go to: Tools | Utilities | Shell & Tube Exchanger Design/Rating Utilities
2. Select the Heat Exchanger available on the simulation
3. Click in EDR Results.
Keywords: EDR, Shell & Tube Exchanger, Aspen Hysys, results
References: None |
Problem Statement: If I feed a 3 phase stream to a 2 phase separator, which liquid does the liquid product stream represent ? What about in Dynamics? | Solution: In steady state HYSYS will mix the two liquid phases back together and send them off the vessel through the liquid product stream.
In dynamics, HYSYS always separates the phases and add each phase to its corresponding holdup. Then it will decide which phase is the heavy liquid, and calculates the interface le... |
Problem Statement: How does the compressor extrapolating in negative zone: of performance curves calculated and take care of surge control valve? | Solution: Extrapolating in negative flow zone:
1. Aspen HYSYS does NOT apply any special methods based on the head values in negative zone, we apply either linear or quadratic extrapolating standards available based on user selection and this option is also applicable in negative head zones
2. Aspen HYSYS perfo... |
Problem Statement: Why does the Aspen HYSYS Pipe Segment unit operation fail to solve when pressure is specified at outlet and temperature is specified at inlet? | Solution: The Aspen HYSYS pipe segment is designed to only handle situations where the boundary conditions are specified on the same side of the pipe. It was not designed to perform a calculation where the pressure is specified at the outlet and the energy (temperature) is specified at the inlet.
In simple cases (no or... |
Problem Statement: What are the Shell Baffle Types Hysys uses for Rating of Heat Exchangers | Solution: Shell Baffle type can be set on the Rating tab ... Sizing page ... Shell radio button of the Heat Exchanger property window.
Single, Double and Triple
These are the standard segmented baffle types as illustrated in the TEMA standards (8th Ed, p 31) or Perry (7th Ed, p 11-42)
Grid
These could equally be called... |
Problem Statement: Can I size a three-phase separator in HYSYS? | Solution: The Vessel Sizing utility does not currently support three-phase separator sizing. While in HYSYS Version 2.4.1 and up you can select a three-phase separator as the object for the Vessel Sizing utility, the calculations will be based only on the Vapour and Light Liquid flows, and will not take the Heavy Liqui... |
Problem Statement: What is the difference between the GCEOS PR package and the standard PR package? | Solution: GCEOS model is used to define and implement your own generalized cubic equation of state including mixing rules and volume translation. When you select PR option from within the GCEOS it reduces to the PR EOS. This is the Standard PR, not HYSYS PR. The main difference between standard PR and HYSYS PR is the a... |
Problem Statement: How can I simulate a heterogeneous catalytic reaction in a PFR? | Solution: A heterogeneous catalytic reaction can be simulated in a PFR. The following document oulines some of the steps as well as some of the terms used in this operation.
Keywords: PFR, Catalytic, Void Fraction
References: None |
Problem Statement: What is Weep Velocity? | Solution: On a tray if the gas rate is too low, much of the liquid may rain down through the openings of the tray (weeping), thus failing to obtain the benefit of complete flow over the tray. The gas velocity at which the weeping starts to occur is defined as weep velocity.
Keywords:
References: None |
Problem Statement: How to model a Decanter in Aspen HYSYS? | Solution: Decanters are used to separate liquids where there is a sufficient difference in density between the liquids for the droplets to settle readily. Decanters are essentially tanks which give sufficient residence time for the droplets of the dispersed phase to rise (or settle) to the interface between the phases ... |
Problem Statement: How do I input my assay data from ASTM D2892 to Aspen HYSYS? | Solution: There is no direct way to input your ASTM D2892 to Aspen HYSYS. The recommendation for these kind of assays is to input them as TBP.
TBP distillations are performed in columns with 15 to 100 theoretical plates at relatively high reflux ratios (i.e., 5 or greater). The high degree of fractionation in these dis... |
Problem Statement: If I change a property in my hypothetical group (MW, NBP, density) will the changes also be made on the component list? | Solution: Yes, the changes will also be made on the component list.
You just have to go Simulation Basis Manager > Hypotheticals > View the Hypothetical Group then change the properties you want and then if you don?t know the rest of them don?t forget to click on Estimate Unknown Properties.
You will also be able to se... |
Problem Statement: 怎样将两个PFD通过一个Feeder连接起来？比如，用户要将第一个PFD的产品物流链接到第二个PFD作为其进料，从而两个PFD通过这条物流连接到一起。 | Solution: 你需要先加入一个新的PFD。
不要从已有的PFD克隆。
然后从已有的那个PFD上删除掉你要连接的那条物流，然后再将这条物流加回去。
你会在新的PFD里面看到这条物流。这条物流和之前PDF里的删除又加回的物流是同步实时链接的。
现在你可以在新的PFD里面以这条物流作为进料进行下游的所有操作的模型建立与模拟。
Keywords: Chinese-
References: None |
Problem Statement: Is the Cp/Cv in stream properties view the Rigorous Cp/Cv in Relief Valve? Similarly, the Cp/(Cp-R)in the properties view is Semi-Ideal Cp/Cv in Relief Valve | Solution: Yes, Rigorous Cp/Cv in RV corresponds to Cp/Cv in the stream. Semi-Ideal Cp/Cv means Cp/(Cp-R) in stream.
Relief Valve View:
Stream Properties View:
Keywords: Cp/Cv, Relief Valve, rating
References: None |
Problem Statement: How to assign the split ratio for Aspen HYSYS Tee in C# | Solution: Aspen HYSYS automation objects may be different between Visual basics and C#. Sometime you could not find the exact objects as VB. For example, you may find there is not TeeOp.Splits.Variables in C# as in VB.
In the case, you may use backdoor variables.
Here is example how to use backdoor variables and spec... |
Problem Statement: What Hotkeys / Keyboard Shortcuts are available in HYSYS? | Solution: File
<Ctrl> + N : Create New case
<Ctrl> + O : Open Case
<Ctrl> + S : Save Case
<Ctrl> + <Shift> + S : Save Case
<Ctrl> + Z : Close Current Case
<Alt> + <F4> : Exit HYSYS
Simulation
<Ctrl> + B : Go to Basis Manager
<Ctrl> + L : Leave Current Environment (Return to Previous)
<Ctrl> + M : Main Properties
<F5> ... |
Problem Statement: Can I access the Cold Properties Utility via Automation? | Solution: Yes, the attached Excel spreadsheet includes code to access all the results from a specified cold properties utility or to link to the cold properties utility linked to a specified stream. It also includes similar functionality to the example inSolution #112356 which adds a critical properties utility to all ... |
Problem Statement: If the heat of combustion is missing for a library component in Aspen HYSYS, can I supply a new value that will be used throughout the associated simulation? | Solution: Aspen HYSYS does not provide the heat of combustion for all library components. For some, such as H2S, the heat of combustion is 'Empty'. As a result, certain stream properties that are based on the heat of combustion (i.e. Higher Heating Value) will display a value of 'Empty' in the Workbook. To eliminate th... |
Problem Statement: How do I reveal hidden objects in the PFD? | Solution: You can reveal hidden objects in two ways.
1) Open the PFD menu and select Show Hidden Objects.
2) Right-click on the PFD background and select Reveal Hidden Objects.
In either case, the Show Hidden Objects view will appear and you can select which Hidden Objects you want revealed. The view contains a Filter ... |
Problem Statement: What criteria does Aspen HYSYS use to term a liquid phase as an aqueous phase? | Solution: Aspen HYSYS uses the following criteria to term a liquid phase as an aqueous phase (dissolved in water):
If the mole fraction of water is either more than 0.5 or more than the combined mole fractions of all the hydrocarbon components in a liquid phase, then Aspen HYSYS terms that liquid phase as an aqueous ph... |
Problem Statement: How compressor curve is calculated for various speed when user specify Head \ efficiency in only one speed? | Solution: As a compressor or expander slows down or speeds up, its head versus its discharge characteristics change. When only a single curve is specified and the specified compressor speed is different from the single user-defined curve speed, the calculations of the head and efficiency based on the characteristics cu... |
Problem Statement: Why can't I Disable a user variable? | Solution: I want to disable a user variable on a particular stream / operation, but the enable checkbox is greyed...
This means the user variable has been set to be automatically enabled on all streams or operations. In order to turn this off go to the Attributes tab on the User Variable editing window of the User Vari... |
Problem Statement: Does Aspen HYSYS calculate the specific gravity relative to air for a stream? | Solution: To display the specific gravity of a stream, one can use the session preferences to change the units of the mass density to SG_H2O60api or SG_H2O60nbs. Note, however, that both available units use the density of water measured at 60F as the reference state.
In order to determine the specific gravity relative... |
Problem Statement: When having a file (Aspen Plus or Aspen HYSYS) in which the user has set up many relief valves under the Safety Analysis environment, it can sometimes take a long time for the file to open. The lengthy reload time is because all calculations are being re-run upon entry into the safety environment. | Solution: To prevent this issue try to save the file from the simulation environment, instead of the safety environment, so then the recalculation on load would be bypassed, which would significantly improve the load time. However, please notice that it will still recalculate upon entering the safety environment.
Keywo... |
Problem Statement: In HYSYS, if you use the Heat Exchanger | Design | Parameters | Heat Exchanger Model | Exchanger Design (End Point), what equations are used to find the heat transfer correction factor? | Solution: See the attached document which contains the equations used to calculate the Ft factor. The equations in the document are from the book, Process Heat Transfer, G.F. Hewitt, G.L. Shires, and T.R. Bott, 1994, CRC Press, Boca Raton FL.
Keywords: Ft
References: None |
Problem Statement: When running a heat exchanger in Aspen HYSYS, does the Exchanger Design (Weighted) model include the Ft correction factor? | Solution: While the Exchanger Design (End Point) model calculates an overall Ft correction factor, the Exchanger Design (Weighted) model splits the heat exchanger into zones of equal enthalpy (i.e. dP/dH, dP/dA, etc.). The UA is then calculated for each zone and the overall UA corresponds to the UA sums for each of the... |
Problem Statement: Aspen Engineering Product installation will not continue after displaying the initial page or two. Error 1327, Invalid H:\ drive is given as the reason. | Solution: To properly complete installation, the user account should have administrative privileges and the user should be able to access the file system and registry without any restriction. Please verify that there is no protection program or network policy preventing the creation or usage of temporary folders. If so... |
Problem Statement: What is component mapping and why is it used? | Solution: Component mapping is used at the interface of two different property packages. The maps tell HYSYS how to transfer the compositions from one property package to another. Composition values for individual components from one fluid package can be mapped to a different component in an alternate fluid package.
Tw... |
Problem Statement: How doI add the stream compositions in the Summary Grid inside HYSYS so I can Export to excel. | Solution: You can copy and paste the Composition from material streams to the Summary Grid but you might need to do the copy and paste Twice in order to work.
Follow this procedure:
1. First from the Ribbon / Home tab / Summaries select the Model Summary.
2. Once you open the summary grid you will see your proc... |
Problem Statement: Unable to locate Aspen HYSYS Amines and Aspen HYSYS Crude on any of AspenOne 2006 DVDs. | Solution: Aspen HYSYS and all engineering related products can be found on the aspenOne 2006 DVD #6. Since Aspen HYSYS Amines and Aspen HYSYS Crude are layered products, installing Aspen HYSYS will automatically load the Aspen HYSYS Amines and Aspen HYSYS Crude modules. These options can then be activated at run time b... |
Problem Statement: How to Calculate Volumetric flow rate along pipeline? | Solution: To get overall volumetric flow rate along pipe, please follow the steps below.
Step1: Select performance tab in pipe segment view window as attached screen shot (Figure 1)
Step 2: Click on view profile in right hand corner of the window. The profile along the pipe length appears as Figure 2. Here, you wil... |
Problem Statement: How to change from molar fraction to mass flow in the composition tab of the workbook. | Solution: 1. Open your workbook and select the compositions tab, after that right click and select Setup:
A
2. When the next window appears, please click delete all the variables since we will need to add those variables in mass flow. Then click in Add and select the variable Master Component Mass Flow and select All... |
Problem Statement: Can I specify aromatic wt% for my oil when I only have ASTM D86 data for the assay? | Solution: A simple answer to this question is NO. You can add aromatics information in the Aspen HYSYS Oil Manager only if you have chromatographic data. Other assay types, such as ASTM D86 and ASTM D1160 do not have separate analyses for paraffinic, naphthenic and aromatic compounds, according to API procedures.
Howev... |
Problem Statement: Can I export database properties from Aspen HYSYS without opening Aspen Exchange Design Rating (EDR)? | Solution: Yes, it is possible to export database properties from Aspen HYSYS without opening Aspen Exchange Design Rating (EDR)? By using this approach, users can avoid consuming additional licenses by having for Aspen HYSYS and EDR both open at the same time. In order to accomplish this task, follow these steps:
1. ... |
Problem Statement: How do I print a large PFD in several sections so it is still legible? | Solution: There is no a direct way in Aspen HYSYS to print in sections, but there is a workaround. Please go to PFD tab and click in Add PDF. Click in clone the existing one and then in each of the cloned PFD you can hide as many objects as you want and then print it. For example, if this is the main simulation:
Then y... |
Problem Statement: Multiple effect evaporators are separation processes widely used in chemical industries. The objective of evaporation is to concentrate a | Solution: consisting of non-volatile solute and a volatile solvent (usually water). Evaporation is conducted by vaporizing a portion of the solvent to produce a concentratedSolution. In a multiple effect system, connections are made so that vapor from one effect serves as the heating medium for the next, resulting in e... |
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