HTRI offers free hour-long webinars to its members. Live webinars include an opportunity for a question and answer session at the conclusion of each session. Visit our registration site to sign up for upcoming webinars.
| Research Update: Flow boiling heat transfer across plain tube bundles | |
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May 23, 2013 |
This webinar will discuss flow boiling data across ideal plain tube bundles collected in the HTRI Multipurpose Boiling Unit and compiled from the literature. Our current method has four heat transfer mechanisms: nucleate boiling, convective boiling, thin liquid film conduction, and natural convection. It is complex with many correlation parameters and cannot predict the data well. Based on the data, we propose a simpler and more accurate crossflow boiling method with only two boiling mechanisms: nucleate and convective boiling. We improve our convective boiling method by combining all three convective terms in our current method: convective boiling, natural convection, and thin liquid film conduction. We also discuss the transition from wet- to dry-wall mist flow. |
Recordings do not include a question answer session, but do include the entirety of the webinar presentation. To view these recordings, you will need Adobe Flash Player and e-Library.
If you have technical issues viewing the recordings, please contact HTRI Technical Support.
| Beyond the Basics | |
| Beyond the Basics: Building Your First Case in Xace | |
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February 23, 2012 |
Are you ready to build your first case in Xace? This webinar discusses the Xace interface, including how to navigate, use program options to model your unit, save multiple runs within a single file, and get help. After the initial discussion on the Xace interface, the webinar works through an example, showing you how to input geometry, run a case, and optimize the results in Xace. |
| Beyond the Basics: Building Your First Case in Xvib | |
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June 2, 2011 |
This webinar describes the capabilities of Xvib and identifies reasons why you would want to use Xvib to carry out a vibration analysis. Other topics included in this webinar are the Xvib input panels and key features of the software, a demonstration on how to build an Xvib case from an existing Xist case and a discussion of the differences between Xvib and Xist. |
| Beyond the Basics: Interpreting Xfh Output | |
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May 13, 2011 |
Xfh has a total of 37 output reports, and today we will look at key numbers on six of these reports (output summary, cylindrical energy balance, stack monitor, convection summary, cylindrical firebox monitor, and combustion streams) using an example we modified from the Xfh training workshop. We discuss the following values, which can be located in these reports: efficiency, setting losses, process outlet conditions, bridgewall temperature, metal temperatures, acid/water dewpoints, film boiling in tubes and draft. |
| Beyond the Basics: Building Your First Case in Xist (Presented in Spanish) | |
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March 30, 2010 |
¿Estás preparado para construir tu primer caso en Xist? Mediante este webinar se muestra la interfaz de Xist y cómo navegar por la misma. Se revela cómo utilizar las opciones disponibles para modelar un intercambiador, cómo determinar qué versión de Xist se está utilizando y cómo acceder a la sección de ayuda. Tras la exposición inicial sobre la interfaz de Xist, se trabajará con un ejemplo de hoja de datos tipo TEMA de información limitada para así diseñar, ejecutar y solucionar problemas en Xist. |
| Beyond the Basics: Understanding Fluid Property Options | |
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November 18, 2010 |
Specification of fluid properties is a crucial part of the design process. This webinar provides an overview of the fluid property specification process in Xchanger Suite. The webinar includes a discussion of HTRI recommendations, “tech tips,” and a cursory discussion of special topics in fluid properties. The special topics include flash types, immiscible fluids, and supercritical fluids. |
| Beyond the Basics: Building Your First Case in Xfh | |
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October 13, 2010 |
The goal of this webinar is to provide a new Xfh user with the information they will need to build their first case in Xfh. The webinar discusses the capabilities of Xfh, including an overview of combustion, the radiant section, the convection section, the stack, and API 530 tube design. Next, we outline how to input values for the cylindrical heater multi-zone model by transferring input from specification sheets and drawings. |
| Beyond the Basics: Debugging Fatal Errors in Xist | |
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August 19, 2010 |
The error messages generated by Xist are helpful because they identify either the root cause or symptoms of the problems with your case. This webinar discusses the types of errors, analyzes four examples of fatal errors, and provides guidelines for preventing and debugging fatal errors in Xist. Important concepts in this webinar include: data check and runtime messages can be informative, warning, or fatal, use Xist resources (help files, FAQs, Tech Tips) to prevent fatal error messages, and use engineering expertise to determine root cause of problems that fatal error messages do not clearly identify. |
| Beyond the Basics: Rating, Simulation, or Design? Understanding Case Modes in HTRI Xchanger Suite | |
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May 20, 2010 |
Most Xchanger Suite modules allow you to run an exchanger in three different modes--rating, simulation, and design. This webinar discusses each type in terms of how they differ, how to specify each type and reasons why each type is useful. |
| Beyond the Basics: Building Your First Case in Xist | |
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March 30, 2010 |
Are you ready to build your first case in Xist? This webinar discusses the Xist interface, including how to navigate, how to utilize the options you have to model your exchanger, how to determine which version of Xist you are running, and how to get help. After the initial discussion on the Xist interface, the webinar works through an example using a TEMA datasheet with limited process information to input, run, and troubleshoot the case in Xist. |
| Is My Design OK? | |
| Is My Design OK? Designing with Dummy Tubes | |
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November 8, 2012 |
Dummy tube use is commonly overlooked and underspecified in tubular heat exchanger design. This webinar provides definitions of dummy tube types, explains why and when they are needed, and, using specific design examples, explores their use in Xist 7. |
| Is My Design OK? Selecting Finned-Tube Bundles | |
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October 18, 2012 |
Are you using Xchanger Suite to model finned-tube bundles? This webinar provides an overview of finned tubes and the various types of finned tubes that Xchanger Suite models. In addition to guidance on when to select each type, the session highlights important, high-level mechanical design aspects of finned tubes. |
| Is My Design OK? Evaluating the Potential for Acoustic Vibration | |
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September 20, 2012 |
Intense sound and vibration can be produced by gas flow through a heat exchanger array of tubes. Typically, the oscillating pressure corresponds to a transverse standing wave across the heat exchanger shell that is perpendicular to the crossflow and the tube axes. The sound is attributed to flow-induced pressure pulsations that are in sympathy with the transverse acoustic modes of the shell. As the velocity is increased, the sound can change mode. Acoustic resonance has occurred in inline tube arrays, staggered tube arrays, single tuberows; for finned and plain tubes; and in cylindrical and rectangular ducts. It has been observed with air, flue gas, steam, hydrocarbons, and two-phase gas-vapor flow. Sound pressure levels within a tube array can reach 176 dB and approximately 20 – 40 dB lower outside the shell. These levels can be physiologically disturbing and can also lead to structural damage. We will discuss methods for assessing the acoustic vibration potential of your shell-and-tube exchanger design. |
| Is My Design OK? Heat Exchangers with Viscous Oils | |
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May 24, 2012 |
Designing for applications using viscous oils is challenging. These fluids vary widely in viscosity, generally have a low Reynolds number, and can experience substantial flow maldistribution. To account for the resulting uncertainty, traditional thermal designs often include large fouling factors. This webinar identifies typical design issues and discusses the methods and attributes that can work well in such applications. |
| Is My Design OK? Floating Head Design and Effects on Tube Layout | |
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March 22, 2012 |
This webinar will discuss the reasons for using floating heads, the differences between the four types (S, T, P, and W), and the effects of diameter and length on floating head design. As we describe design considerations for each type, we will provide tips and rules-of-thumb for achieving optimal, practical designs. |
| Is My Design OK? Temperature Efficiency in Design | |
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November 10, 2011 |
Design software packages use incremental models to correlate the performance of heat exchanger geometry and fluid heat release curves; however, the heat exchanger thermal efficiency is often lost in the process. Thermal efficiency enables designers to select appropriate heat exchanger geometries with respect to heat release curves. It also helps them identify plant "bottleneck" exchangers, indicating the replacement bundle configurations that could yield the highest performance improvement. This webinar explores the thermal efficiency of various shell-and-tube geometries and provides methods to determine and increase thermal efficiency for specific cases. |
| Is My Design OK? Thermosiphon Modeling in Xist | |
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March 3, 2011 |
To help you better use Xist to model thermosiphon reboilers, this webinar begins with an overview of thermosiphon reboiler operations. Next, we discuss design rules-of-thumb and Xist input guidelines, including reboiler inputs and piping. The webinar concludes with helpful hints for interpreting results by focusing on troubleshooting error messages. |
| Is My Design OK? Shell Selection | |
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October 14, 2010 |
Inferior thermal design often results from the selection of incorrect shell type. This webinar reviews TEMA shell types, describes the factors that impact shell selection, and discusses the advantages/disadvantages of TEMA shell types. Using Xist®, we compare the results of shell selection on a single-phase liquid, low temperature approach, a once-through reboiler, and a vacuum mixture condenser. |
| Is My Design OK? Baffled by Heat Exchanger Design | |
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July 15, 2010 |
Throughout the webinar, we examine standard TEMA and Non-TEMA baffle types, Xist examples to illustrate how different baffles affect heat exchanger performance, and rules of thumb concerning proper design with respect to baffle cut, spacing, and orientation. Finally, we provide a summary of the performance characteristics of the different baffle types, to guide effective shell-and-tube heat exchanger design. Please note, a handout of relevant literature, performance summaries, and Xist examples is included for this webinar. |
| Is My Design OK? Understanding Tube Layout | |
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April 22, 2010 |
This webinar discusses the key issues you should address to achieve successful tube layout in a heat exchanger. After reviewing methods to maximize the tubecount in the shell, such as the selection of an effective tube layout approach and knowing when to replace or remove tubes, we go on to discuss how to identify the best methods for avoiding tube removal/replacing tubes and methods to use for determining how to improve thermal performance after tube removal. |
| Is My Design OK? Shellside Condenser Design | |
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February 18, 2010 |
A concise review of shellside condenser design, this webinar begins with a discussion of the fundamentals of shellside condensation, including film condensation and pressure drop. The webinar uses a vertical G-shell condenser model as a sample case to dicuss the objectives of condenser design. |
| Research Updates | |
| Research Update: Analysis of NTIW Shellside Performance using CFD and Xist | |
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May 9, 2013 |
This webinar will discuss Xist and CFD predictions of three NTIW exchanger configurations – 2 baffle, 4 baffles, and 6 baffles. The discussion will focus on the contributions of crossflow and longitudinal flow on heat transfer, which is due to varied baffle spacing for the same baffle cut. During the webinar, the presenter will provide suggestions on how to use Xist to conservatively model an NTIW exchanger. |
| Research Update: Pressure Drop in Inclined Intube Downflow Condensation | |
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April 18, 2013 |
Based on recent research, HTRI has developed a new pressure drop method for inclined cocurrent condensation. In this webinar, we discuss the effect of tube inclination on two-phase flow regimes and pressure drop. The performance of the existing inclined condensation pressure drop method is assessed against data, and an improved pressure drop correlation is presented. |
| Research Update: Design and Construction of the Rotating Fouling Unit | |
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March 28, 2013 |
HTRI currently runs fouling experiments on the High Temperature Fouling Unit (HTFU) which recirculates a 27 liter sample of crude for periods up to one month. As we plan to expand our crude oil fouling test program, we are investigating alternate test methods to screen crude oil fouling with smaller sample volumes and shorter test durations. We are currently constructing the Rotating Fouling Unit (RFU) which will heat a 2.8 liter crude oil sample and impart a shear stress with a rotating cylinder. |
| Research Update: Evaluation of HTFS and HTRI Shellside Condensation Methods | |
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March 26, 2013 |
Using available open literature sources and data from HTRI’s shellside condensation database, HTRI compared the predictions of horizontal shellside condensation correlations documented in HTFS™ reports and methods contained in HTRI Xchanger Suite®. The results show that HTFS methods slightly overpredict heat transfer coefficients for pure components and poorly predict heat transfer coefficients for condensation of mixtures with and without noncondensable gases. However, HTFS methods for pressure drop outside plain tube bundles perform marginally better than current HTRI methods. We continue to evaluate HTFS methods for possible implementation in our refactored software. |
| Research Update: Modeling Flat Bundles in Kettle Reboilers | |
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March 7, 2013 |
Engineers may design flat bundles in kettle reboilers by removing tuberows from round bundles to create a larger disengagement space. This webinar discusses application of the kettle reboiler circulation boiling model to flat bundles. It reviews calculations for the static driving head and maximum heat flux for flat bundles. We also demonstrate how removing rows from a round bundle to create a flat one affects the total bundle flow rate and the critical heat flux. |
| Research Update: A Review of Shellside Flow Regimes | |
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February 27, 2013 |
This webinar provides a review of current HTRI, open literature, and HTFS research on shell flow regimes. The best available flow regime map will be identified, and focus areas of further research efforts will be discussed. |
| Research Update: Quantitative Flow Visualization Techniques | |
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May 10, 2012 |
Flow visualization describes the art of making visible what is invisible. Using flow visualization techniques, scientists like da Vinci, Reynolds, and Prandtl discovered some of the most fundamental concepts concerning wakes and boundary layers. The rapid evolution of affordable electro-optics and digital image processing during the last several decades has increased the scope and fidelity of flow visualization so that now entire two- and three-dimensional vector and scalar fields can be measured quantitatively. These measurements are particularly valuable for validating computational fluid dynamics simulations. In this webinar, we will overview several quantitative flow visualization methods available at HTRI’s Research & Technology Center and describe some recent applications. |
| Research Update: Condensation with Desuperheating Webinar | |
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April 26, 2012 |
When superheated vapor enters a condenser, the vapor cannot condense until the sensible heat content is removed in a process called desuperheating. Reports CT-21 and CT-22 present experimental data, discuss the principles of pure components and mixture wet-wall desuperheating, and review available heat transfer models and correlations. These reports also propose methods, based on heat and mass balance, for determining the wet-wall desuperheating heat transfer coefficient. Comparisons show that the new methods predict all of HTRI’s data and 95 percent of Lehr’s data within ±25 percent of error ratios. This webinar discusses the experimental research included in Reports CT-21 and CT-22 and the methods proposed for Xchanger Suite 7. |
| Research Update: Single-Phase Crossflow Methods | |
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March 29, 2012 |
HTRI continues to improve its single-phase crossflow methods. We have completed a thorough review of heat transfer and pressure drop correlations for single-phase flow outside banks of plain- and low-finned tubes. This webinar highlights some of our findings and summarizes the performance of the improvements we are proposing for our correlations. Further explanation of this work can be found in HTRI Technical Report S-SS-3-23 (for plain tube banks) and a new report that will be issued soon (for low-finned tube banks). |
| Research Update: Condensation in Welded Plate Exchangers | |
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December 15, 2011 |
Plate heat exchangers (PHEs) are well suited for applications that require compactness, low weight, and high efficiency. Traditional gasket-type PHEs are limited to a low range of pressures and temperatures. When operating pressures and temperatures exceed the range of a traditional gasket PHE, a welded-plate design is sometimes used. This webinar discusses HTRI’s condensation data and methods, as well as alternative literature models. Limitations of these methods are shown and recommendations for future work are discussed. |
| Research Update: Non-Newtonian Flows in Heat Exchangers | |
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May 24, 2011 |
HTRI has begun a research program dedicated to non-Newtonian flows. In order to discuss the plans for this research program, this webinar reviews the following items: the definition non-Newtonian fluids, the use apparent viscosity, focusing on power law fluids, how non-Newtonian flows affect pressure drop and heat transfer in heat exchangers and the capabilities of Xphe with regard to non-Newtonian fluids. The webinar concludes by reviewing the future of the non-Newtonian flow research program at HTRI. |
| Research Update: Crude Oil Fouling | |
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April 28, 2011 |
We begin this webinar with a definition of crude oil fouling and the difference between crude oil fouling and other types of fouling mechanisms. Following this review, we discuss fouling research at HTRI by describing the High Temperature Fouling Unit (HTFU), the research testing that we conduct, and the prediction models that are in development. |
| Sneak Previews | |
| Sneak Preview: Xchanger Suite 7 | |
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December 11, 2012 |
This webinar provides an introduction to three of the new features included in HTRI Xchanger Suite 7. Features discussed in this webinar include tube layout functionality, mechanical design inputs, and impingement protection options. |
| Sneak Preview: Xpfe | |
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October 25, 2012 |
This webinar provides an introduction to the Xpfe module, which will be released with HTRI Xchanger Suite 7. First, we discuss the geometry and capabilities of plate-fin exchangers. Next, we describe the overall configurations, advantages and disadvantages of this type of exchanger. Finally, we conclude the webinar with a demonstration of Xpfe. In the demonstration, we create and run a simple case and review the input panels, output reports, and graphical capabilities (plots and drawings). |
| TechTips | |
| TechTip: Tube Spans in the Xist Vibration Report | |
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January 17, 2013 |
Xist automatically generates a vibration analysis report for all cases. The software selects tube spans for analysis based on a range of factors, including TEMA shell type, baffle type and baffle orientation. While users are generally familiar with the structure of the vibration report for TEMA E shells, the methods applied to other shell styles are less well-known. This webinar will describe the basis for selecting tube spans and the methods used to determine the unsupported tube length for all shell types. |
| TechTip: Modeling DX Evaporators | |
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November 28, 2012 |
This webinar provides an overview of DX evaporators and how to model them in Xist and Xace, including what has changed in Xchanger Suite 7. |
| TechTip: Differential and Integral Flash | |
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July 12, 2012 |
The webinar will discuss the details of differential and integral flash calculations. Using an example case, we will describe when each can (and should) be used and the differences in performance you can expect. |
| TechTip: Modeling Subcooling in Horizontal Condensers | |
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June 28, 2012 |
In horizontal condensers, flashing sometimes occurs downstream in the condensate discharge system. Incorporating a certain amount of subcooling may ensure that flashing does not occur. This webinar reviews HTRI’s subcooling and nozzle-sizing recommendations for condenser design and presents a method for calculating the condensate height in partially flooded units. The webinar concludes with a worked example highlighting the issues covered. |
| TechTip: Skin Temperature Computation in Xist | |
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April 5, 2012 |
Skin temperature is an important variable in heat exchanger design because it may influence both fouling and corrosion. Xist output reports list various skin, wall, and tube metal temperatures, but these data need to be interpreted correctly. In this webinar, we explain the influence of skin temperature on heat exchanger reliability, review Xist output data, and demonstrate how to use Xist to obtain realistic values. Additionally, we will explore design techniques to control skin temperatures. |
| TechTip: Customized Heat Transfer and Pressure Drop Calculations in Xchanger Suite | |
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January 26, 2012 |
Xchanger Suite provides sophisticated modeling capabilities for a wide range of heat exchangers. Occasionally, you may need to customize the software to extend its capabilities. In this webinar, we discuss the reasons for using non-standard solutions and explore the range of customization options available. Additionally, using an example case, we review and demonstrate the use of f- and j-factors to specify pressure drop and heat transfer correlations. |
| TechTip: Modeling Horizontal Thermosiphon Oil Coolers | |
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September 8, 2011 |
Thermosiphons are used in distillation columns, solar water heaters, refrigeration, and many other applications. This webinar focuses on one type: cooling screw compressor oil using a thermosiphon. It also includes a discussion of design and operation guidance available in open literature. The session ends with a demonstration of how Xist models horizontal thermosiphon oil coolers. |
| TechTip: Optimizing Tube Flow – Mechanisms and Devices | |
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July 21, 2011 |
Optimizing tube flow is a difficult quest if you do not understand the mechanisms by which tube inserts work. This webinar will describe the different types of tube inserts, explain how these different inserts work, help you determine which tube inserts are the best fit for your application, and discuss some of the pitfalls of tube inserts. |
| TechTip: Improvements in Specifying EMbaffles® | |
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February 24, 2011 |
HTRI continues to improve EMbaffle implementation in Xist. In this webinar specifically geared toward the use of EMbaffles in Xist, we describe the technology, discuss how to specify EMbaffle in Xist, and explain the EMbaffle-related improvements in Service Pack 3. We conclude the webinar by demonstrating input options for E- and F-shells in Xist. |
| TechTip: Impact of HTRI Xchanger Suite 6, Service Pack 3 | |
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February 17, 2011 |
Service Pack 3, released in January of 2011, includes a number of improvements for Xchanger Suite. This webinar discusses a few of these improvements in detail, including the HTRI input translation tool, modifications to heat transfer coefficients, changes to reports, and updates for kettle reboilers, continuous fins, and EMbaffles®. |
| TechTip: UniSim® Feedwater Heater Modeler | |
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January 20, 2011 |
The webinar provides an introduction to feedwater heaters and a demonstration of the UniSim Feedwater Heater program. The introduction discusses the typical steam cycle, performance attributes, operational issues, and geometry of feedwater heaters. The demonstration includes a brief discussion of the UniSim Feedwater Heater program user interface and output results. |
| TechTip: Modeling Flooded Evaporators | |
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December 16, 2010 |
This webinar describes modeling flooded evaporators using Xist®. It reviews HTRI shellside boiling methods and discusses the similarities and differences for modeling kettles, x-shells, and flooded evaporators in Xist®. We use an ammonia chiller case to demonstrate a performance comparison of these three models. |
| TechTip: Kettle Entrainment Prediction (Presented in Chinese) | |
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September 15, 2010 |
After discussing an overview of kettle reboilers and the fundamentals of entrainment, this webinar reviews Xist® input and output as well as design considerations that affect kettle entrainment. By working through an example case, this webinar teaches that accurate prediction of liquid entrainment is crucial for some applications, that liquid carryover depends on many parameters, and that Xist version 6 calculates a more accurate entrainment and provides more options than past versions. |
| TechTip: Modeling A-Frame Condensers | |
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September 13, 2010 |
A-frame condensers can be modeled in Xace® (version 6) by using the workarounds outlined in this webinar. After viewing this webinar, you will be able to describe A-frame geometry and analysis methods. The webinar includes a demonstration of Xace input options and works through two sample cases – a rating without reflux and a simulation with reflux. |
| TechTip: Using HTRI Xchanger Suite with UniSim Design® | |
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June 29, 2010, September 8, 2010 |
You can obtain properties from UniSim Design® within any module in Xchanger Suite or from UniSim Design® by embedding an Xist model into a UniSim Design® simulation. This webinar demonstrates how to interface between Xchanger Suite and UniSim Design® by installing and registering UniSim Design®, calculating properties, importing streams, and embedding Xist cases. The methods demonstrated are valid for other HYSYS based process simulators, and are not limited to UniSim Design®. |
| TechTip: Impact of HTRI Xchanger Suite 6, Service Pack 1 | |
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January 28, 2010 |
If you have not investigated the benefits of Service Pack 1, this webinar is for you! The discussion includes a summary of the most siginificant changes such as improvements to unit conversions, continuous fins, VMGThermo™, fired heaters, momentum recovery, Microsoft® Excel®, and the tube layout drawing. |