Tag: THERMOSIPHON REBOILER

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BG1-20 Shutdown Heat Flux for Vertical Tubeside Thermosiphon Reboilers

December 18, 2025

This report reviews shutdown data and criteria for a vertical tubeside thermosiphon reboiler (VTTR) documented in a previous report. A new correlation for the shutdown heat flux is proposed. This correlation uses the vaporization duty, applicable to both pure component fluids and mixtures, to bridge the gaps that the previous correlations...
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• THERMOSIPHON REBOILER
• SUBCOOLING
• BOILING
• VTTR

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RTC update: Improvements to Prototype Test Unit (PTU) expand research potential

September 11, 2023

At our Research & Technology Center (RTC), we perform research that improves the accuracy of our methods and software, as well as contract testing for external clients. We recently used the PTU for turndown and performance testing of thermosiphon reboilers. Upcoming research includes experimental observations of full or partial differential condensation in...
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• THERMOSIPHON REBOILER
• HEAT EXCHANGERS

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TT-19 Piping options in Xist

September 28, 2026

This TechTip discusses the specifics of the detail piping methods for thermosiphon reboiler designs created in Xist....
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• XIST
• THERMOSIPHON REBOILER

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BG1-19 Heat Transfer and Pressure Drop in Vertical Tubeside Thermosiphon Reboiler Under Turndown

June 10, 2020

This report summarizes HTRI data on vertical tubeside boiling, highlighting the shortcomings of current methods in accurately predicting tubeside pressure drop and heat transfer at low mass velocities. Improvements to the liquid holdup model and a warning message for thermal prediction close to turndown conditions are also discussed. When implemented in...
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• THERMOSIPHON REBOILER
• BOILING

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Research Update: Guidelines for Vertical Tubeside Thermosiphon Reboiler Turndown

May 28, 2020

Thermosiphon reboilers often pose challenges for column operations in refineries and chemical processing plants. Some challenges are related to turndown, when reboiler circulation rates or duties are lower than design conditions. The process industry uses various checklists and criteria, though most guidelines have little to no validating data backing them up....
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• THERMOSIPHON REBOILER
• RESEARCH

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BG1-18 Turndown Operation of a Vertical Tubeside Thermosiphon Reboiler

October 21, 2019

This report provides a comprehensive look at the turndown operation of a vertical tubeside thermosiphon reboiler (VTTR), including predictions of thermal and hydraulic performance and quantitative criteria for turndown limits. Data were collected for water, n-pentane, p-xylene, and n-pentane/p-xylene mixtures in an industrially relevant VTTR flow loop. The unit was systematically turned...
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• BOILING
• THERMOSIPHON REBOILER

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Demystifying thermosiphon operation

June 05, 2019

Siddharth Talapatra, Group Lead, Research Engineers focused on the thermal and hydraulic aspects of heat exchangers sometimes forget that exchangers do not operate as standalone units. A thermosiphon reboiler is one application where understanding the flow loop around the heat exchanger is vital. Essential to refineries and chemical processing plants, a...
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• VTTR
• THERMOSIPHON REBOILER

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Educational: Introduction to Thermosiphon Reboilers

August 21, 2018

Thermosiphon reboilers are often used to provide heat to industrial distillation columns. In this webinar, we discuss different types of thermosiphon reboilers and some of their design challenges....
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• EDUCATIONAL
• THERMOSIPHON REBOILER

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Research Update: Identifying Ledinegg instability in a VTTR

July 20, 2017

In a vertical tubeside thermosiphon reboiler (VTTR), Ledinegg instability can occur when the tubeside pressure drop decreases with increasing flow rate. Theoretical analysis of two boundary conditions—constant heat flux and constant steam pressure—revealed that for either condition, Ledinegg instability can occur in a VTTR only when intube frictional pressure drop dominates...
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• RESEARCH
• THERMOSIPHON REBOILER
• LEDINEGG INSTABILITY

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Research Update: Shellside Longitudinal Liquid-phase and Flow Boiling Heat Transfer for Vertical Plain Tube Bundles

January 19, 2017

Vertical shellside boiling is used for a variety of applications, including vertical thermosiphon reboilers where hot fluid must be on the tubeside steam generators/waste heat boilers, which use very hot or corrosive fluids as the heating medium vertical feed-effluent exchangers, whose vertical orientation prevents phase separation Ideal vertical shellside reboilers have...
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• BOILING
• RESEARCH
• SHELLSIDE
• THERMOSIPHON REBOILER
• PLAIN TUBE

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TechTip: Service Type Defaults in Xist

January 16, 2017

Xist® service types are improved and expanded in Xchanger Suite® 7. During this webinar, we will discuss and demonstrate the default values provided for thermosiphon reboiler and reflux condenser service types....
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• REFLUX CONDENSER
• TECHTIP
• THERMOSIPHON REBOILER
• XCHANGER SUITE
• XIST

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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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