Tag: DESIGN

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Beyond the Basics: Multi-Objective Optimization for Design of Heat Exchangers

May 21, 2025

Commercial heat exchangers in the process industries are designed according to standards from entities such as TEMA or API. The designer’s goal is to maximize the heat transfer coefficient and minimize cost, area, and pressure drop. However, these objectives often conflict. For example, changing a geometric design parameter such as tube...
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• HEAT EXCHANGERS
• GEOMETRY
• DESIGN

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CG-13 Modeling Spray Condensers

December 20, 2023

This report reviews and evaluates literature methods for modeling spray condensers. It discusses droplet size, distribution, motion, and mass and heat transfer in a hot vapor stream. The methods in the literature are sufficient for modeling spray condensation of a single component without a noncondensable gas. Limited research on spray condensation of...
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• ENTRAINMENT
• DESIGN
• CONDENSERS

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Is My Design OK? The Challenges of High Effectiveness Exchangers

June 14, 2018

Temperature effectiveness is the change in process fluid stream temperature divided by the difference between the hottest and coldest temperatures in the exchanger. If the required effectiveness is greater than 0.8, non-ideal fabrication or variable process conditions can significantly reduce performance of many exchanger types (shell-and-tube, plate-frame, plate-fin, etc.). Learn about...
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• DESIGN
• EFFECTIVENESS

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TT-18 Design guidance for no-tube-in-window (NTIW) baffles

January 26, 2017

Component: Xist Date posted: 25 March 2015 Last updated: 16 May 2024 Compared to other segmental baffle designs, no-tube-in-window (NTIW) baffles improve tube support with low pressure drop. Adding intermediate support plates between baffles can alleviate tube vibration for virtually any baffle spacing, thus simplifying low pressure drop designs. However, NTIW...
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• NTIW
• DESIGN
• BAFFLE

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TT-5 Design guidance for distributor plates in X shells

January 26, 2017

Component: Xist Date posted: 13 March 2008 Last updated: 13 June 2024 The thermal and hydraulic calculations in Xist assume that the shellside flow in X shells is uniformly distributed along the length of the bundle after entering the exchanger and before moving through the bundle in cross flow. This TechTip...
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• TECHTIP
• DESIGN

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Is My Design OK? Lessons Learned: Falling Film Evaporators

February 01, 2017

The purpose of this webinar is to discuss industry experience with vertical tubeside falling film evaporators, including specified applications and design principles for configuration. In this webinar, we identify potential design problems in keeping tube walls wet and discuss HTRI’s current methods in addressing these concerns within Xist®....
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• DESIGN
• FALLING FILM
• XIST

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Is My Design OK? Trends in Process Heat Transfer Webinar

January 16, 2017

In this webinar, we will discuss key trends in the field of process heat transfer. Reasons and methods to reduce thermal design margins, increase process efficiencies, and improve manufacturing are identified during this session....
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• DESIGN
• ENHANCEMENTS
• GEOMETRY
• HEAT TRANSFER

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Is My Design OK? Modeling Air-Cooled Condensers with Subcooling

January 16, 2017

Subcooling is often required for air-cooled condensers. This webinar will address common technical support questions such as – how many tubes and passes are needed to subcool sufficiently? how is phase separation modeled? what are the best modeling guidelines for Xace®? – and provide HTRI's recommendations. Attending this webinar will help...
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• AIR COOLED
• CONDENSERS
• DESIGN
• SUBCOOLING
• XACE

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Is My Design OK? Applying API 661 Annex C to Air-Cooled Heat Exchanger Designs with Viscous and High Pour Point Fluids

January 16, 2017

Winterization in accordance with API 661 Annex C may need to be considered by designers when air-cooled heat exchangers are operating in climatic extremes. In order to prevent operating problems in-situ, a temperature safety margin should be added to the critical process temperature to determine the specified minimum tubewall temperature. For...
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• AIR COOLED
• API 661
• DESIGN
• VISCOUS
• XACE

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Is My Design OK? Design Guidance for Impingement Rods

January 16, 2017

This webinar discusses the background of impingement rods used in heat exchanger design, identifies HTRI recommendations for the use of impingement rods (and their design), and describes current HTRI research in this field....
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• DESIGN
• IMPINGEMENT RODS
• XIST

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Is My Design OK? Designing with Dummy Tubes

January 16, 2017

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® Version 7....
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• DESIGN
• DUMMY TUBES
• XIST

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Is My Design OK? Selecting Finned-Tube Bundles

January 16, 2017

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....
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• DESIGN
• FINNED TUBES
• XACE
• XIST

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Is My Design OK? Evaluating the Potential for Acoustic Vibration

January 16, 2017

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...
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• DESIGN
• VIBRATION
• XIST

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Is My Design OK? Heat Exchangers with Viscous Oils

January 16, 2017

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...
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• DESIGN
• FOULING
• VISCOUS

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Is My Design OK? Floating Head Design and Effects on Tube Layout

January 16, 2017

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....
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• DESIGN
• FLOATING HEAD
• TUBE LAYOUT
• XIST

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Is My Design OK? Temperature Efficiency in Design

January 16, 2017

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...
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• DESIGN
• THERMAL EFFICIENCY

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Is My Design OK? Thermosiphon Modeling in Xist

January 16, 2017

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....
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• DESIGN
• THERMOSIPHON REBOILER
• TROUBLESHOOTING
• XIST

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Is My Design OK? Baffled by Heat Exchanger Design

January 16, 2017

This webinar examines different types of baffles (TEMA and non-TEMA) and demonstrates how different baffles affect heat exchanger performance. Further, we discuss some rules-of-thumb for proper design with respect to baffle cut, spacing, and orientation. Finally, we will provide a summary of the performance characteristics of the different baffle types, to...
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• BAFFLE
• DESIGN
• RATING MODE
• XIST

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