Vertical thermosiphon reboiler software (VTD) is a desktop application this is made to illustrate the thermal design calculations for vertical thermosyphons. The software program especially makes use of kern technique for calculations. Major capabilities are listed beneath.


  1. Thermal design calculations using kern technique
  2. Support S.I Units and English (U.S) Units of measurement
  3. Unit converter consists of 23 measurements with 200-unit conversions
  4. Select TEMA types/designations
  5. Heat duty can be entered or calculated
  6. Counter flow or parallel flow arrangement
  7. Calculate or specify recirculation ratio
  8. Calculate or specify exit vapor mass fraction
  9. Calculate pressure drops, overall heat transfer coefficients…etc, the table included below includes more details on calculated variables but not limited to all of them.
  10. The calculations are preformed using trial and errors basis. Primarily based on the user’s preference the software can start with iterating the recirculation ratio or the tube length.
  11. Minimal and maximum recirculation ratios in addition to minimum and maximum tube lengths maybe specified  for iterations.
  12. Use built in tube counts tables or use values for specifying tube dimensions and range.
  13. Advisory design hints and validation for max heat flux density. Mist flow at tube outlet, driving force check,
    liquid height for circulation check

Available tables and databases;

  • water and steam properties
  • fouling factors
  • Material thermal conductivities
  • Typical film heat transfer coefficient values, store your own values too!
  • Estimate the Physical properties of pure components for more than 1450 components; the database has the ability to estimate Thermal Conductivity, Density, Heat Capacity and Viscosity. The database also included critical properties, boiling and melting points and come as a standalone interface but easily integrated with the software.
    Ability to add your own properties in the additional user databases.
  • Tube counts


Results are initially displayed in a data grid table containing all cases side by side with the initial case or main case being the first in the table.
The table with all cases can be copied to clipboard for pasting anywhere.
Results can also be exported to .csv file to be opened in any office software such as Microsoft excel or open office.
Drawing summary can be generated for individual case results
A results summary report of the case selected can also be generated copied or exported to .csv as well as printed.

DescriptionRequired inputOptional inputCalculated variableComments
Physical propertiesYes
Prandtl numberNoYesYes
Inlet mass flow rateYesYesYesCalculated for unknown side
Heat DutyNoYesYes
Log Mean TemperatureYes
Heat transfer areaYes
Flow areaYes
Mass velocityYes
Exit liquid mass flow rateYesProcess side
Exit vapor mass flow rateYesProcess side
Exit vapor mass fractionYesYesProcess side
Shell diameterYesYes
Number of tubesYesYes
Tube thicknessYesYesBWG list available
Tube clearanceYes
Tube lengthYes
Tube pitchYes
Tube inside diameterYesYes
Tube outside diameterYes
Number of bafflesYes
Baffle cutYes
Baffle to shell clearanceYesYes
Maximum allowable heat fluxYesYesAssumed value can be provided
Heat transfer coefficientYesYes
Overall heat transfer coefficient (Clean)Yes
Overall heat transfer coefficient (Design)Yes
Lockhart-Martinelli parameterYes
Critical mass flow velocity for mist flow checkYes
Pressure drop – inletYesShell side
Pressure drop – frictionalYesShell side
Pressure drop – outletYesShell side
Pressure drop – inletYesTube side
Pressure drop – outletYesTube side
Pressure drop – frictionalYesTube side
Pressure drop – staticYesTube side
Pressure drop – accelerationYesTube side
Driving forceYes
Head elevationYes
Required liquid height for circulationYes
Recirculation ratioYesYes

Vertical thermosiphon reboiler software benefits

Simple to use and could do multiple cases as well as provide advice through checks which might be done at some stage in calculations and displayed in effective way during each trial run. Adding to that the software license is permanent and don’t have an expiry date. Each software license may be managed via our software program activation center. License doesn’t expire as long as you observe our simple license activation and removal instructions. Network licenses is likewise available with a license term of three years may be prolonged if required. To check our licensing and pricing please visit the prices and order information page

Demo version download

Demo version can be downloaded by clicking here

The demo version is limited to operate for 90 day with the four examples included. Changes to input are not permitted.

Video demonstration

Video demonstration clips are available here

Software Screen Shots

vertical thermosiphon reboiler software

See more screen shots by following the links available in our screen shots page

System requirements

Vertical thermosiphon reboiler software need the following computer configuration to run:
Microsoft Windows operating system
30MB free disk space;
Microsoft .Net Framework 4.6

Supported Operating systems:
Windows 7 Service Pack 1, Windows 8, Windows 8.1, Windows 10