Category: DESIGN

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....
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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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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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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....
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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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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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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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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...
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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 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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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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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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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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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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Component: Xist Applicable to: All supported versions (Versions 7.3 and 8) Date posted: 25 March 2015 Compared to other segmental baffle designs, no-tube-in-window (NTIW) baffles provide improved tube support with low pressure drop. Adding intermediate support plates between baffles can alleviate tube vibration for virtually any baffle spacing, thus simplifying low...
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