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Problem Statement: What is the meaning of the surface value (Surf/unit(eff)) on the TEMA data sheet? | Solution: The surface value from the TEMA data sheet (Surf/unit(eff)) is the effective area per unit of heat exchanger. If you have a certain number of parallel shells (x) and a certain number of series shells (y), the total area will be:
Area = x * y * (surf/unit(eff))
The effective surface area (i.e. area of all ... |
Problem Statement: When exporting the results of an EDR case into an Excel template by going to File | Export to, users have two options.
a) One is to choose Excel using Specified Template, where users need to manually navigate to the directory where the desired template is located, and select the relevant temp... | Solution: 124571. This is not always convenient, when frequently using a particular template.
b) The other one is to choose Excel using Default Template, where users need firstly to set a default template. Then this template will be automatically used every time when users select Excel using Default Template, w... |
Problem Statement: Why is there a pressure rise instead of a pressure drop in my heat exchanger? | Solution: This scenario is possible if there is a significant loss of velocity of the fluid inside the heat exchanger. The phenomenon is typically observed in condensation processes, since the fluid velocity reduces significantly as the vapor condenses. Bernoulli's equation implies that a loss in velocity head causes a... |
Problem Statement: Sometimes I notice that the duties are different between Aspen Tasc+ and Aspen TASC when using the fixed mode for a thermosyphon. | Solution: In Aspen TASC or Aspen Tasc+, the thermosyphon calculations have two modes of operation: Fixed flow and Find flow.
1. In Fixed flow, Aspen TASC and Aspen Tasc+ determine the pressure losses in the exchanger and associated pipework. Fixed flow will result in a physically un-real pressure imbalance around the... |
Problem Statement: There are three issues with the legacy HTFS programs and Vista and for that matter Windows XP if you are a restricted user.
By default Vista users are all restricted users, unless you specifically designated as an administrator | Solution: 1) If user tries to run the legacy products and select an example file which we distribute and place in a folder under Program Files. The program will not be able to open the file as writable. We have noted in the Known Issues that the user should copy these files to a non-restricted folder before trying to r... |
Problem Statement: How to download files from aspenONE Exchange? | Solution: 1. Click on the Icon for the app that you are interested in. For example, the 'Sulzer Select' tool:
2. To begin downloading, click on the play button
3. You will be prompted to enter your support site credentials if you have not already
4. The file will either automatically download or you... |
Problem Statement: General guidelines for avoiding vibration at the design stage. | Solution: Avoiding Vibration at the Design Stage.
Make certain all possible duties are investigated: plants are often operated at different temperatures and pressures, even with different fluids, for example during catalyst reduction or during cleaning. Designers should note that many units are operated at flows beyond... |
Problem Statement: How can I add or remove an application from an Exchanger, Design and Rating (EDR) file? | Solution: Aspen EDR program has the option to add or remove a number of applications within the same file.
Adding an application -
An EDR file can be made to have more than one application in it. What this means is that if you have an EDR file with one application and if you wish to add more applications in the same fi... |
Problem Statement: There are various ways in which user can arrange the multiple shells of the exchanger to obtain the optimum heat transfer and pressure drop results. User can choose to have tubeside flow in series or parallel regardless to the flow pattern selected for shellside flow.
Aspen Shell and Tube Exchanger c... | Solution: In Aspen Exchanger Design & Rating (EDR), you can specify the number of shells in series or parallel under Input | Exchanger Geometry | Shell/Heads/Flanges/Tubesheets | Shell/Heads tab. Since multiple shells in series are usually needed due to temperature range overlap of the streams, an overall Counterflow ... |
Problem Statement: How can I transfer data from Aspen Shell and Tube Exchanger to Aspen Air Cooled Exchanger or Aspen Plate Exchanger? | Solution: Aspen Exchanger Design & Rating (EDR) has an inbuilt transfer feature that can be used to transfer the process and property data from Aspen Shell and Tube program to Aspen Air-cooled or Aspen Plate exchanger or vice-versa. One EDR file can have multiple applications in it and user has the option to load these... |
Problem Statement: A Process Simulator File (PSF) can be used to transfer data to the Exchanger Design and Rating (EDR) suite of programs, where the file can contain both process and physical property data. This | Solution: describes a methods to generate a PSF file using Aspen Plus.Solution
From an Aspen plus simulation that contains a HEATX block, with heating/cooling curves generated using the HXDESIGN property set, the HTXINT utility can be used to generate a PSF file.
Creating the Property Set in Aspen plus
1. First... |
Problem Statement: What do the nozzle escape area and bundle entrance/exit areas mean? | Solution: The nozzle escape area is the area through which the nozzle flow enters the shell, either directly into the bundle or into the space between the nozzle and the bundle.
The bundle entrance area is the area available for the flow to leave the the inlet nozzle escape area and flow into or around the bundle. Equi... |
Problem Statement: What is the definition of the total, effective and required area and the difference between U clean, U dirty and U service? | Solution: The total area of the heat exchanger is determined by the PI (3.14) * Tube Outer Diameter * Tube length * Number of tubes * number of shells.
The effective heat transfer area is the area available for heat transfer (this is also often referred to as the actual area). This is the total area minus areas which a... |
Problem Statement: Vortex shedding is a lock-in effect, caused by the periodic shedding of vortices from the tubes and can lead to damaging tube vibrations if it occurs at the tube natural frequency. This can cause substantial vibration in liquids, but only negligible vibration in gases (unless the gas has a high densi... | Solution: In order to check for the possibility of vibration due to vortex shedding, the program calculates the vortex shedding frequencies (fvs) and outputs the ratios of these to the natural frequencies (fn).
Some general attempts to avoid vortex shedding:
Alter the vortex shedding frequency by changing (increasing o... |
Problem Statement: Should I click Yes after receiving the error message about exceeding max disk space for Aspen Exchange Design & Rating temporary files? | Solution: By clicking Yes, the cache in memory is cleared but the actual temporary files are not deleted.
Keywords: EDR temporary files
cache
References: None |
Problem Statement: How is the width of a pass partition lane specified in Aspen Shell & Tube Exchanger? | Solution: A tube bundle can have multiple passes where the Pass layout can set as mixed (H), quadrant or ribbon. This will mean that there will be pass partition lanes, which further depends on the orientation of the pass layout. Users can select these options under Input | Exchanger Geometry | Bundle Layout | Layout P... |
Problem Statement: Two phase flow in a vertical tube can adopt many geometric configurations of the distribution between the liquid and gas phases, which are commonly known as ?flow patterns? or ?flow regimes?.
When subcooled liquid flows through a vertical tube heated with a constant heat flux, the heat transfer coeff... | Solution: In a heated tube the heat transfer and pressure drop are both dependent upon the flow pattern. Therefore, to predict these reliably, knowledge of the prevalent flow pattern is required. Flow patterns may be predicted from either;
Empirical flow pattern maps: Data collected from flow pattern observations may b... |
Problem Statement: Exchanger Design and Rating module crashes when started up with user level authority but works well when logged in to run as Administrator. | Solution: Exchanger Design and Rating software will need to access the Temp folder, if the folder is user protected, e.g. no full administrative access, it will crash the EDR from running. The reason is the software utilizes the temp folder for temporary caching.
In Windows 7 or Vista OS, look for this folder instead, ... |
Problem Statement: Why is there a difference in heat coefficients and heat transfer rates between V7.3.2 and V8.0? | Solution: The change is caused because was added friction component in the shell between the baffles in V.8 follow by a change in shell side flow fractions
The change in coefficients between V7.3.2 and V8.0 is caused by adding friction with the shell between the baffles in V.8 follow by a change in shell side flow frac... |
Problem Statement: How does Aspen Shell & Tube Exchanger calculate the cleaning factor? | Solution: As per the HTFS handbook,
Aspen Shell & Tube Exchanger calculates fouled and clean overall heat transfer coefficient and is displayed in Results Summary->Overall Summary sheet.
Keywords: Fouling resistance, Cleanliness factor, heat transfer coefficient
References: None |
Problem Statement: How do I view the Aspen Exchanger Design & Rating browser in expanded view by default? | Solution: From the Tools | Program Settings under the UI Options 1 select Show browser in expanded view to view the EDR browser by default in the expanded view.
Keywords: EDR browser, expanded, view
References: None |
Problem Statement: What is the Definition of Baffle Cut for Single and Multi Segmental Baffles in a heat exchanger. | Solution: This value is the amount of the Transverse Baffle that is cut away expressed as a percentage of the Shell Inside Diameter. The baffle cut range depends on the baffle type:
Single Segmental Baffles
With Single Segmental there is a single baffle style: A one-piece baffle with an Outer Baffle Cut Y
Double Segm... |
Problem Statement: Aspen Properties can be used within Aspen EDR programs to generate physical properties of a pure component or mixture.
Since the V7.0 release (the latest release is V7.3), the components are now placed in one list that is used by both streams, which is different from previous releases, where separate... | Solution: Within versions newer than and including V7.0, a single stream component list is created. If the component does not exist in the stream, specify 0 in the composition field or leave blank and the program will ignore its presence when generating the physical properties.
Keywords: Aspen Properties, AP, component... |
Problem Statement: Thermosiphon outlet piping do not reflect gravitational losses | Solution: When the percent of head loss option is used for the outlet pipe no separate allowance is made for gravitational and accelerational pressure changes in this pipe. These are normally small, but they are all lumped together with the frictional change, when the percent head loss option is used.
When the From Pip... |
Problem Statement: In Aspen EDR (Exchanger Design and Rating) programs, from the drop-down list of top menu option ? File, there are two options ? `Close? and `Exit?. What?s the difference between them? | Solution: Inside one EDR file, there could be more than one application for different types of heat exchangers. More details of how to have multiple applications within one EDR file can be found in TechicalSolution 132710.
`Close? applies to the individual application inside one EDR file. In other words, choosing this ... |
Problem Statement: Cost estimation is a very important concern for Aspen Tasc+ users. Here is a list of questions from our users and answers from HTFS+ development team. | Solution: Q1: How often do we update the material cost database?
A1: We typically update material cost with each major release, which is based on US nationwide average. They were last updated with Aspen HTFS+ V2006.5. We strongly recommend that customers maintain their own material costs for the materials they use most... |
Problem Statement: Sometimes it is necessary to model plugged tubes on a heat exchanger. How can this be done using Aspen Shell & Tube Exchanger? | Solution: On Shell & Tube Exchanger you can enter the number of Tubes which are plugged (blocked off) under Exchanger Geometry\Tubes\Number of tubes plugged.
The total number of tubes specified is used to determine the shell side layout, and flow areas for shell side flow.
The heat transfer area is then determine... |
Problem Statement: How to remove warning message, 1215 for Kettle reboiler? | Solution: In a K shell, the shellside pressure drop is essentially due to the liquid level submerging the bundle that is controlled by the weir height. The recirculation model assumes the fluid entering the bundle is heated where it evaporates and reduces in density so reducing the gravitational pressure drop. This gra... |
Problem Statement: Why does the cost differ when the fluid allocation is changed in rating calculation mode for the same heat exchanger type and geometry? | Solution: Rationally, with the same type and size of heat exchanger, user may think the cost should stay the same regardless of fluid allocation when running in rating calculation mode. But user will notice the cost difference when the fluid side is changed. This difference is due to the pressure of the fluid at the sh... |
Problem Statement: In the TEMA Handbook 9th edition, section T-4.3.1 (page 7-5) says
The shell mean metal temperature, generally assumed to be equal to the shell fluid average temperature.
Sometimes this may be different from the value given by Aspen Shell & Tube in either the Results | Thermal / Hydraulic Summary | He... | Solution: describes how the shell mean metal temperature is calculated.Solution
From Results | Calculation Details | Analysis along Shell | Interval Analysis tab, the shellside bulk fluid temperature is given with distance in the exchanger and from the Plots tab this can be seen graphically. Aspen Shell & Tube determin... |
Problem Statement: Does Aspen Shell & Tube Exchanger (formerly Tasc+) report outlet component flow rates? | Solution: Starting from V7.0, Aspen Shell & Tube Exchanger (formerly Tasc+) reports component flow rates. The results are under Results || Thermal/Hydraulic Summary || Performance || Hot Stream Composition or Cold Stream Composition tab.
Note: You definitely need to specify inlet compositions to get outlet component fl... |
Problem Statement: While trying to process the Collaborative Forecast (CF) overrides in a Demand Manager (DM) case I get an error message referencing the RCFTODM set. The error message could look like the following:
E0054: SCM Command Failed
SET: RCFTODM RULE: RREADSEC
COND: FMTDATA CFOVERSE FMTCFSET (SECURITY)
(Note... | Solution: The rules in set RCFTODM call the FMTFDEF table (FMTDATA file definition). The FMTFDEF table contains the CF Integration section which defines the directory path for all files that are read from external file location related to CF data.
The file directories specified in FMTFDEF table (CF Integration section,... |
Problem Statement: 是否可用Aspen Shell & Tube Exchanger 程序来模拟虚拟防冲管？如果可以，如何定义相应设定？ | Solution: 是的，Aspen Shell & Tube Exchanger 程序可以模拟虚拟防冲管。
首先，你需要到Input > Exchanger Geometry > Nozzles > Shell/Tube Side Nozzles 界面去设定''Yes impingement''。
然后你要到Input > Exchanger Geometry > Nozzles > Impingement 界面去定义''Dummy tubes''。
然后用户就可以在界面下方开始输入相应的dummy tube的参数设定，比如管行数。
Keywords: Chinese-
References: None |
Problem Statement: How does one accurately generate the properties of an Electrolyte system in a Heat Exchanger in Aspen HTFS+? | Solution: If there is an electrolyte system in your heat exchanger, Aspen Properties ELECNRTL is the recommended physical property method. ELECNRTL uses special density models to accurately predict the density of aqueous electrolyte systems, but without running ELECWIZARD inside Aspen Properties, the property method wi... |
Problem Statement: In Aspen Shell & Tube Exchanger, it is possible to set different baffle types, like single, double and triple segmental baffles for example from Input | Exchanger Geometry | Geometry Summary or Input | Exchanger Geometry | Baffle/Supports | Baffle tab. The selection of the baffle type will have an im... | Solution: describes the geometry of the arrangement, which is different to that described in the ?Standards of the Tubular Exchanger Manufacturers Association? TEMA Handbook, 9th Edition page 5.4-1.Solution
The baffle arrangement for triple segmental baffles is as shown below, where there are two forms of baffles;
1. ... |
Problem Statement: After running an EDR thermal case, in the Results | Calculation Details section, the program reports stream properties in terms of one vapour phase and one liquid phase separately. The liquid properties output in the results are for the overall liquid phase
When having two liquid phases present in ... | Solution: The basic methods of calculating different types of property parameters for combining the two liquid phases are described below.
Density: calculate a mass fraction average of the two liquid phase densities
Specific Heat: calculate a mass average specific heat in the same way as for the ... |
Problem Statement: How do I extract column reboiler data from Aspen HYSYS in Aspen Shell & Tube Exchanger? | Solution: Aspen Shell & Tube Exchanger cannot detect column reboiler when trying to import from the Hysys file.A In order to import reboiler stream data from Hysys file, there are few steps you have to do in the Hysys file.
First, you have to export the internal stream out from the column environment to the main enviro... |
Problem Statement: 在选择'User specified properties'的情况下, 用户要自己手动输入物流的物性参数. 有些时候用户可能没有在某特定温度变化范围内的焓值或者焓变, 所有此情况下的热焓曲线无法生成. 本解决方案讨论的是在此种情况下, 如何通过物流本身的物性参数来计算出焓值的变化. | Solution: 在解决方案119148里, 焓变的计算公式如下:
dh = Latent Heat * dx + [(1-x) * Cpl + x * Cpg] * dT
其中:
dh = dT范围内的焓值变化
dT =一个极小的温度变化
dx = dT范围内的气化率变化
x =此温度范围内的平均气化率
Cpl, Cpg =此温度范围内物流的平均液相比热容和平均气相比热容
Latent Heat =潜热
热力学计算里, 特定温度区间内的焓值的变化很重要. 一旦焓变能够确定, 每个温度点的特定焓值就能确定. 如果设定初始温度点的特定焓值为零, 则接下来所有后续温度点下的特定焓值就能被确定.
通过总结,有以下四种计算焓变的方... |
Problem Statement: When using the Aspen Shell & Tube Design and Rating utility inside Aspen HYSYS, the user can input the values through the Process menu.
However after running the utility, these numbers are not the same: | Solution: The reason for this is that the fouling factor output is based in the outer diameter, while the input is based on Inner Diameter.
If the user wants to have a consistency between these values, a correction factor must be used.
Keywords: Fouling factor, Heat exchanger, Utility
References: None |
Problem Statement: Under what conditions are the evaporators considered operating with 'continuous falling film'? | Solution: The criteria for a continuous film in falling film evaporators is that the film flowrate is above the minimum wetting rate.
The minimum wetting rate is the film flowrate below which the tube walls are not fully wetted, causing the thermal performance of the evaporator to deteriorate. Aspen Shell & Tube Exchan... |
Problem Statement: How does Aspen Shell & Tube Exchanger program calculate the span length for Tube location 2 (tube row just outside the baffle overlap) for reporting in the Vibration & Resonance analysis? | Solution: Tube Row 2 is one of the representative tubes considered for the vibration analysis. Tube row 2 is the row just outside baffle overlap. Based on the experience that there are certain tube rows within an exchanger that are most likely to suffer vibration damage, Aspen Shell & Tube program follows a conservativ... |
Problem Statement: What does Operation Warning 1324 mean, and how do I prevent it? | Solution: This item applies to horizontal shell side condensers and is applicable when there is a lute, side nozzle or some other device or geometric feature that causes some of the tubes in the exchanger to be submerged under the condensate.
The program calculates the velocity and hence the heat transfer coefficient ... |
Problem Statement: How do I select a specific tube for vibration check? | Solution: The risk of vibration in any tube in an exchanger depends on where it is supported, by baffles or other supports, and on local flow velocities along its length. Aspen Shell & Tube Exchanger automatically selects a small representative set of tubes to perform vibration checks in older versions.
In Aspen Shell ... |
Problem Statement: What do the different damping values under the Fluid Elastic Instability Analysis mean? | Solution: The software initially considers three general levels of damping defined by log decrements of 0.1, 0.03 and 0.01. The highest value, 0.1, reflects heavy damping, the value of 0.03 serves as a medium value, while 0.01 would represent light damping. Typical log decrements for a single phase liquid stream on the... |
Problem Statement: A Process Simulator File (PSF) can be used to transfer data to the Exchanger Design and Rating (EDR) suite of programs, where the file can contain both process and physical property data. This | Solution: describes two methods to generate a PSF file using HYSYS.
Solution
The two methods are detailed below;
Method 1:
From within the standalone EDR program, from the main menu, select File | Import from | Aspen HYSYS V7.x.
A popup box will appear where a HYSYS case can be selected. The HYSYS file will then be... |
Problem Statement: After running the file, I get Input Warning 1243. What does it mean? | Solution: The bundle band orientation corresponds to the Pass layout that has been chosen under Input | Geometry Summary | Bundle Layout (i.e. Mixed, Quadrant and Ribbon).
The pass partition lane refers to the gaps between the tubes. For example, in this case, there are three passes.
The steam will be flowing in Horizo... |
Problem Statement: The Exchanger Design and Rating (EDR) program can be linked to Aspen Plus for the detailed calculation of Shell and Tube Exchangers.
Normally from a HeatX block in Aspen Plus, the Aspen Shell & Tube Exchanger can be selected from the Setup | Specification tab. Once this is selected the location for t... | Solution: describes how to set Aspen Plus and Shell & Tube, so that the programs can run together, providing both Aspen Plus and EDR are installed on the computer.Solution
1. From Start | Run enter Regedit and OK
2a. Assuming you have a 32 bit operating system, navigate to HKEY_LOCAL_MACHINE\SOFTWARE\AspenTech\Aspen Pl... |
Problem Statement: Stream data views in the simulation flowsheet view are not persisted when a user logs off the client. The next time user logs in, and displays the same model's flowsheet, the stream data tables are not displayed, and each stream has a leader line but no table. | Solution: The problem has been resolved. This is a client side issue, the Aspen Plus or HYSYS computer needs to be updated. To update the Aspen Plus or HYSYS computer,you can either apply the latest Aspen Plus or HYSYS patch or download and apply the Aspen Search client install from the following location.
Keywords: ... |
Problem Statement: You are trying to expand your Collaborative Demand Manager (CDM) environment to contain 24 months of forecast instead of 18 months.
Changes were made to CDM Publishing in the development environment of the Aspen Collaborative Forecasting (CF) system. However, after moving the changes into production,... | Solution: The production server's CF service need to be restarted. Restarting the CF WebLogic service resolves the issue.
In production, it is recommended that you restart the CF services at least once per month for every roll forward. In this case, adding a number of time periods requires a refresh which is accomplish... |
Problem Statement: How do I create a component that is not available in any of the physical property packages databank? | Solution: To create a component that is not in the database, you will have to create a private user databank and that is on Tools --> Data Maintenance --> Chemical Database --> Chemical Databank Maintenance screen.
On the lower left hand corner of the screen, press the 'Add' button then type the new component name on t... |
Problem Statement: What is happening when I select the Renew Working Forecast icon in AspenTech Demand Manager? What part of the forecast is being renewed? | Solution: The Renew Working Forecast icon from the Create Statistical Forecast screen (Forecast Generation>Create Statistical Forecast), calls the rule specified in APPDATA (FCRNWINIT). In the standard Demand Manager CAP case, FCRNWINIT is set to the rule RRENEW1I. In the standard CAP case the working forecast is retai... |
Problem Statement: In some cases, when trying to run an EDR case that has imported process and property data from a Aspen HYSYS case, a fatal error is given due to a heat load imbalance, which is generally caused by interpolation / extrapolation of the property data. This | Solution: addresses how to prevent such errors.Solution
The problems are due to the inconsistencies between the outlet pressures in the EDR case and the default 2nd pressures during the importing procedures. The 2nd pressures need to be manually re-set during importing. For more details please refer to the attached Wor... |
Problem Statement: The viscosity of a mixture stream reported by EDR might not match literature of experimental values when the components are defined individually. | Solution: Aspen Exchanger Design and Rating contains some pre-defined mixtures within the program database where the properties have been fit to match literature values. This is the case of, for example, Ethanol 50%.
However sometimes the user might be using a different mixture that is not present in the database. So... |
Problem Statement: Is it possible to use relative humidity to specify composition in Aspen Tasc+? | Solution: No, relative humidity cannot be used as a compositional basis in Aspen Tasc+; only overall composition (on a mass or molar basis) is allowed when defining stream composition.
Keywords: Tasc+, humidity, composition, specification
References: None |
Problem Statement: In Aspen Exchanger Design & Rating (EDR), user can select horizontal cut Single segmental baffle with F type shell. However, you will notice that the Setting plan shows a Double segmental baffle which has three baffle pieces for this case. | Solution: A horizontal-cut single segmental baffle in an F-shell is equivalent to a double segmental baffle, which has three baffle pieces. You can see that, with F type shell, you have the options to type in Inner cut & Outer cut for Single segmental baffle under Input | Exchanger Geometry | Baffles/Supports | Baffles... |
Problem Statement: How do I use the new input Specify Some Sizes in Design? | Solution: Specify Some Sizes in Design is a special input which is only available in the console, and is only used in design mode. When a??Yesa?? is selected, some of the Exchanger Size inputs, normally grayed-out in design mode, become available. If any of these inputs is selected, it is used to set the (default) valu... |
Problem Statement: In Tasc+, Latent Heat is shown on the TEMA sheet as a physical property, and also on the Results | Thermal/Hydraulic Summary | Heat Transfer | Duty Distribution page.
How are the two Latent Heat parameters related to each other? | Solution: The two places where Latent Heat is explicitly referred are shown below.
1) Tasc+ Screen Shot: TEMA Sheet
For later discussion, we denote Latent Heat on screen 1) as LH_e/m. We also denote the materials transferred between vapor and liquid phase as M_lv. From the above screen,
LH_e/m = 1018 Btu/lb
M_lv ... |
Problem Statement: What are the new enhancements done to the On-Line Help for EDR V7.0? | Solution: The on-line help that supports the EDR programs has been restructured for the V7.0 release. This involves dividing the help text for each application into logical chapters that reflect the structure used within each application.
For example:
Aspen Shell & Tube Exchanger (Shell&Tube)
1. Shell & Tube Inpu... |
Problem Statement: Why is the value of the Shell ID in the performance page different from the value in the geometry summary and TEMA sheet? | Solution: The shell diameter reported in the Performance Page is a rounded value. This can be slightly different from that reported in the Geometry Summary and the TEMA sheet if a different dimensional standard is set in the Application Option page. Internally, the software rounded the inch to mm and when the rounded d... |
Problem Statement: I am running a case and getting Input Warning 1062 regarding the location of the hot fluid. What does it mean? | Solution: Input Warning 1062 is indicating a more fouling or hazardous fluid is on the shell side and suggesting you to change it to tube side to avoid any corrosion and erosion on the shell side and for easy cleaning and handling of exchanger.
This is just a recommendation by the program and must be evaluated used you... |
Problem Statement: Fluid elastic instability (FEI) is important for both gases and liquids. It occurs whenever a fluid flows through an exchanger and some motion is imparted to the tubes. The displacement of a tube from its normal position alters the flow field through the tube bundle which in turn alters the force bal... | Solution: This is not a resonance but a true instability with the amplitude of vibration limited only by colliding with other tubes, baffles or the shell.
In Aspen Shell & Tube Exchanger (Tasc+), Fluid Elastic Instability warning messages are generated if the ratio of W/Wc >1, where W is actual flowrate and Wc is the c... |
Problem Statement: The enthalpy values shown in Aspen Tasc+ / Aspen Shell & Tube Exchanger (and Aspen Acol+ / Aspen Air Cooled Exchanger) appear different from the data imported from Aspen HYSYS. | Solution: The absolute value of the stream enthalpies may be different due to the chosen reference state, however it is the change in enthalpy that is important. The enthalpy difference between two states (for example, the difference between the outlet and inlet streams in an exchanger) in Aspen HYSYS and the correspon... |
Problem Statement: Where do I specify the de-resonating baffles in Aspen Shell & Tube Exchanger? | Solution: Starting with Aspen Shell & Tube Exchanger V 7.0 you can now explicitly specify the number and location of de-resonating baffles, which can protect against any acoustic resonance, one of the conditions reported in the vibration output. These baffles do not appear on the tube layout output, but are handled ful... |
Problem Statement: How can I set cumulative load in Tasc+? | Solution: Tasc+ doesn?t have a cumulative load input, however, the specific enthalpy is equivalent.
Specific enthalpy can be calculated as in the example below:
Heat load [BTU/h] = Flow rate [lb/h] x Specific Enthalpy [BTU/lb]
Keywords: cumulative, load, heat, specific, enthalpy
References: None |
Problem Statement: How do I generate custom export templates? | Solution: Aspen Shell & Tube Exchanger provides three templates for each product, i.e. Blank, TEMA and Full results.
1. Select template from folder where the program is installed such as Program Files-> AspenTech-> Aspen Exchanger Design and Rating Vx.xx-> Excel Templates-> Shell&TubeTEMAsheet.xltm.
2. Export results i... |
Problem Statement: In a ''multiple shells in series'' case, sometime users may see a discrepancy in terms of overall pressure drop for both shell and tube side, between the output of Aspen Shell & Tube Exchanger and their own calculation. What is the cause of this discrepancy? | Solution: The cause of the Pressure Drop discrepancy may be due to the Intermediate Nozzles that are used to connect multiple exchangers in series, and Shell & Tube Exchanger considers their presence as compulsory.
On Results | Thermal / Hydraulic Summary | Pressure Drop tab, users should see the intermediate nozzles b... |
Problem Statement: How do I resolve error in loading DLL when importing physical property data from Aspen HYSYS? | Solution: When importing physical property and process data from Aspen HYSYS into an Aspen EDR, EDR will search the Windows registry for the path of hysys.exe and the type library hysys.tlb. If any of the files is missing under the installation directory, you will get this message.
In Aspen HYSYS V7.2, the files are ty... |
Problem Statement: Natural frequency is an inherent characteristic of a body and is a primary parameter in vibration analysis. A heat exchanger tube in principle has an infinite set of vibration frequencies, but only the lowest natural frequency is usually important, and this is all that Shell & Tube Exchanger (Tasc+) ... | Solution: A basic equation that may be used to determine the natural frequency of a straight tube is:
Where:
f - Tube natural frequency (in Hertz)
l - Tube span length (distance between supports)
E - Tube material property (Youngs modulus)
I - Tube section (second moment of area)
m- Effective mass (internal fluid, ... |
Problem Statement: In Design Mode, the tube passes entry box is grayed out. Is there some way to limit the number of tube passes for an exchanger while in Design Mode? | Solution: As shown in the figure below, it is possible to restrict the range of certain design parameters (i.e. shell diameter, tube length, tube passes, baffle spacing, baffle cut, shells in series, shells in parallel) via the Program Options | Design Options | Geometry Limits pagetab. To fix a design parameters at on... |
Problem Statement: Within Aspen EDR (Exchanger Design and rating), users can use user-defined (non-databank) components either as pure component or as part of a mixture. Users need to define these components firstly in Aspen Properties, and then link the Aspen Properties model with the EDR model they want to run.
Later... | Solution: describes how to overcome this 'user-defined components disappearing after re-open' issue by using Advanced Options of Aspen Properties-EDR link inside the EDR program.
Solution
This is because the user has chosen 'Import existing Aspen Properties (.APRBKP) file' option to link the Aspen Properties model with... |
Problem Statement: Aspen Properties is linked to HTFS+ as a thermodynamic package. When a user select Aspen Properties for physical property calculations, he/she should know that additional files are created by Aspen Properties.
How are Aspen Properties files managed in HTFS+? | Solution: If Aspen Properties is installed on user's computer, HTFS+ will offer Aspen Properties as a physical property calculation engine for generating stream properties, such as density, heat capacity, viscosity, thermal conductivity, surface tension and enthalpy.
Aspen Properties can be used for either for one si... |
Problem Statement: This Knowledge Base article provides steps to resolve the following issue:
Global Search and Tag Search in aspenONE Process Explorer don't work. However, type ahead feature from the Tag Input Line works. | Solution: 1. Run ADSAx64 As Administrator. This should resolve the missing ADSA data source for tags in the Legend.
2. Check Authentication Type on the aspenONE virtual application in IIS. Anonymous Authentication should be Enabled and Windows Authentication should be Disabled.
Keywords: None
References: None |
Problem Statement: What is meant by Wet Wall Desuperheating? | Solution: When a vapour is being cooled, the fluid in contact with the tube wall is colder than the bulk fluid. At some point, the fluid in contact with the wall could be cooled below the dew point before the bulk fluid reaches the dew point. Fluid in contact with the tube wall could therefore start to condense before ... |
Problem Statement: The flow of the shell side fluid can impart energy to the tubes in a heat exchanger that may cause them to vibrate.
The Tubular Exchangers Manufacturer Association (TEMA) Handbook 9th Edition in Section 6 presents a method for determining the flow induced vibration, where this | Solution: describes how the Amplitude and Acoustic Vibration analysis results presented may be interpreted.Solution
If the ?Simple TEMA Analysis? vibration analysis method has been selected from Input | Program Options | Methods/Correlations | General tab, then when a case in run, the Vibration performance is shown in ... |
Problem Statement: How can I set a VEV exchanger type in Aspen Tasc+? This exchanger style was available on early versions of the program. | Solution: To set a VEV exchanger style in Aspen Tasc+, use a BEM shell (which is the default TEMA designation for the program) and then specify a cone for both the front and rear heads; the steps are as follows:
1. In Input > Exchanger Geometry > Shell/Heads/Flanges/Tubesheets > Tab Covers set the front and the... |
Problem Statement: In Aspen Collaborative Demand Manager, DMINIT command does not generate current month information in the DMPST set. | Solution: Although the Max Count of DMPST set is large enough, DMINIT command does not generate current month information in the DMPST set (i.e. DMINIT PERIOD=MONTHLY). This is because only the past periods will be included in DMPST set. When the period is over, it will be added to DMPST set.
The current period is not ... |
Problem Statement: If I delete an existing re-alignment done in Aspen Collaborative Demand Manager, will the prior months return to the original, as if no alignment was done?
Here is the scenario:
I need to delete the following realignment existing in DM tool:
After I deleted the realignment, will the volum... | Solution: Anytime a realignment is deleted, re-apply all must be run. After running re-apply all, yes, everything will be returned to what it would have been without the realignment.
In the example provided above, there may be other realignments affecting the same items so we can?t say specifically everything will re... |
Problem Statement: What is the formula for interpolating and extrapolating Viscosity in Shell&Tube/Air-cooled Exchanger? | Solution: Commonly the properties in properties table are used Linear interpolation or extrapolation when program required more temperature point data and the data input by user is insufficient.
However, for viscosity the natural log is used to interpolate or extrapolation.
Here's an example for the attached case:
... |
Problem Statement: Aspen Collaborative Demand Management consists of two modules: Aspen Collaborative Demand Manager (DM) and Aspen Collaborative Forecasting (CF), which support collaboration and exchanging information about volume and price, including overrides. This article explains the differences between the volume... | Solution: Background: Demand Manager uses price to calculate revenue by converting volume to revenue, using the following formula: Revenue = Volume (or Quantity) x Price (for additional details, see “Chapter 15: Configuring Units of Measure and Prices” in the Aspen Collaborative Demand Manager Implementation Guide).
... |
Problem Statement: Which property package is recommended for thermal oils in Exchanger Design and Rating (EDR) calculations? | Solution: It is recommended to use the Aspen Properties Wilson GLR (WILS-GLR) for thermal oils in EDR. This property package uses an enthalpy method that optimizes the accuracy tradeoff between liquid heat capacity, heat of vaporization, and vapour heat capacity at actual process conditions. This highly recommended met... |
Problem Statement: Turbulent buffeting occurs when a body is placed in a turbulent flow field and the forces on the surface of the body are changed rapidly with time and position. This is because the magnitude and direction of the velocity vector are continually changing. If the variation in force is well correlated, (... | Solution: In order to examine the possibility of turbulent buffeting excited tube vibration, the Aspen Shell & Tube Exchanger (Tasc+) program estimates the tube natural frequency (fn), the turbulent buffeting frequency (ftb) and the acoustic frequency (fa). The results are presented as ratios of the turbulent buffeting... |
Problem Statement: Where can I find Polyethylene Glycol on Hysys & EDR? | Solution: Polyethylene Glycol is located on the APV73.POLYMER databank, you can add an Aspen Properties Databank Component List, then go to Enterprise Databases Tab on the component list view, add APV73.POLYMER databank, go back to selected tab and browse for PEG or glycol as shown in the following screenshot.
Keywords... |
Problem Statement: How do I make Excel reflect the changes in EDR? | Solution: Excel and EDR link is established through built in macros in Excel template. The macros open and read values from EDR file and write to Excel. If EDR file is opened prior to running the macros, the change in EDR might not be reflected.
It is a best practice to close all EDR and Excel files and open only the s... |
Problem Statement: Aspen Shell & Tube Exchanger does not allow one tube pass for G and H shells. How do I model this exchanger? | Solution: You can model this exchanger using two approaches:
1. It might be reasonable to model as an X-shell in some cases
2. The alternative method for 1-pass F,G,H shells, is to specify 2 passes, and a pass multiplier of 0.5
You can try both 0.5 pass multiplier and X-shell then compare results and (for desig... |
Problem Statement: How do I export my EDR file to Excel? The menu options are not active. | Solution: It is a good practice to save EDR file as soon as it is created. You cannot export the results of an unnamed EDR file.
Keywords: Excel, template, EDR, heat exchanger
References: None |
Problem Statement: What is a lock-in effect when looking at the Vibration & Resonance Analysis? | Solution: The lock-in effect is the phenomenon whereby an excitation frequency coincides with a characteristic frequency of a body to possibly cause a large amplitude of vibration. Such excitation frequencies and characteristic frequencies checked within Shell & Tube Exchanger (Tasc+) are:
? Excitation freque... |
Problem Statement: How do I specify Variable Baffle Pitch in Aspen Shell & Tube Exchanger? | Solution: Starting with Aspen Tasc+ 2006.5 you can specify Variable Baffle Pitch.
The use of variable different baffle pitch at different points along the shell side flow path provides the opportunity for improved designs in difficult cases; for example, where a large baffle pitch is needed in some places to keep pre... |
Problem Statement: Input Error 1805: P53: Two pressure levels at which Physical Properties are supplied for stream 1 (or 2) differ by less than 0.01%. How to fix it? | Solution: The error message is complaining about the same (or almost same) pressures level. The difference in two pressures should be at least 0.01%.
Go to Input || Property Data || Hot (or Cold) Stream Properties. Select the pressure you want to change and type a new number that satisfies the 0.01% restriction.
Keywor... |
Problem Statement: Why do fins not change the effective surface area? | Solution: The overall heat transfer equation used is:
1/U = 1/hs + 1/ht + rs + rt.
In the above, all coefficients must be referenced to the same area (i.e. the area is based on tube side outer diameter). The adjustment for the finned area is applied to the heat transfer coefficient. If you calculate U with and with... |
Problem Statement: How does Aspen Shell & Tube Exchanger simulate dummy tube or rod impingements? | Solution: Aspen Shell & Tube Exchanger program can simulate dummy tube or rod impingement as follows:
First, you will need to go to Input > Exchanger Geometry > Nozzles > Shell/Tube Side Nozzles tab to specify ''Yes impingement''.
Then you will need to go to Input > Exchanger Geometry > Nozzles > Impingement tab to spe... |
Problem Statement: Aspen Shell & Tube Exchanger shows the local average tube metal temperature along the length of the exchanger, but we can if necessary calculate the inside and outside tube metal surface temperature using the heat flux and heat transfer coefficients available from the Interval Analysis table in the p... | Solution: Here is an example of how we can perform this analysis:
1. The information we require for the calculation is available under Results | Calculation Details | Analysis along Tubes | Interval Analysis tab as shown in the screenshot below.
2. In the first row, the point is at a distance of 8059 mm from the en... |
Problem Statement: As described in | Solution: 126045, users can transfer the stream physical properties from an Aspen HYSYS exchanger block into a standalone Aspen EDR file, by opening an *.EDR file, going to File | Import from | HYSYS, and selecting the correct exchanger block in the HYSYS case.
However, this behavior will mean the HYSYS file and EDR ... |
Problem Statement: When assessing the Shell & Tube Exchanger (Tasc+) results for flow induced vibration, a condition known as triple coincidence should be looked for. | Solution: Triple coincidence is when a single tube suffers two (or more) vibrations, Lock-In Effects, at the same location along it's length (for example: fvs/fn and ftb/fn resonance at the inlet for the first tube row in the bundle). In this condition the tube is being excited by two vibration mechanisms at the same t... |
Problem Statement: In Aspen Shell & Tube Exchanger when using the ?find flow? option for a thermosyphon, the flowrate through the exchanger is calculated from a pressure drop balance around the piping circuit and the heat exchanger.
When in ?thermosyphon? mode the geometry of the heat exchanger must be specified along ... | Solution: With the ?find flow? option, the unaccounted losses should be negligible. However, if the values are large then this may be due to using the Advanced calculation mode in Input | Problem Definitions | Application Options.
There are two options to minimize these unaccounted losses;
From the Warning & Messages, ... |
Problem Statement: Each release of an AspenTech program has a unique reference number, that is a series of digits, giving the version, cumulative patch and build number. This | Solution: describes how to check the numbers in the Aspen Exchanger Design & Rating (EDR) suite of programs.
Solution
Open the program, go to main menu on top of the diagram, and then select Help > About Aspen Aspen Exchanger Design and Rating
A separate window will pop up.
Check out the numbers in the brackets, whic... |
Problem Statement: Due to the fabrication of heat exchangers, tubes in similar locations within the bundle may have quite different damping due to the assembly. Some tubes maybe tightly contained by the baffles (heavily damped) whilst an adjacent tube may be loose and will vibrate if shaken (lightly damped).
The tube v... | Solution: If the ?Full HTFS Analysis? vibration analysis method has been selected from Input | Program Options | Methods/Correlations | General tab, then when a case in run, the Vibration performance is shown in Results | Thermal / Hydraulic Summary | Vibration & Resonance Analysis | Fluid Elastic Instability (HTFS) an... |
Problem Statement: How does Aspen Shell & Tube Exchanger calculate the Tube Layout? | Solution: There are three steps in determining the tube layout:
1. Determining the outer limits of the bundle ? and the overall number of tube rows and columns
2. Determining the number of rows and columns in each pass region, and hence the location of pass partition lanes
3. Determining the location of each tube in ea... |
Problem Statement: How and when do I use the Prune option in Aspen Collaborative Demand Manager? | Solution: Aspen Collaborative Demand Manager works with the data that is imported into the model from flat text or excel files or from any other Database. These imported data are used as attributes to perform Aggregation, which in turn helps in presenting the forecast in the required format. Aggregation is purely based... |
Problem Statement: This is to follow up on the Introduction of Aspen Licensing Dashboard- How to set it up on the client PC | Solution: Please see attached document on how to set up the Aspen Licensing Dashboard on the client PCs.
Based onSolution ID:136456
Keywords: Aspen Licensing Dashboard, Installation & Setup, Licensing, Server, Usage
References: None |
Problem Statement: How do I test my connection to the Support site trough aspenONE Exchange? | Solution: Sometimes due to internet connection and company policies some ports and IPs need to be active. To start with the diagnose we recommend the users try the following:
1. Verify Aspen HYSYS V8.4 or V8.6 is updated with all the security patches.
           * For HYSYS V8.4 please refer toSolution 1418... |
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