Release Notes 2.0.0.46

Version 2.0.0.46. Build 2.0.6500.17875.

• Thermal Balance:
  • Thermal Conductivity:: In previous versions thermal conductivity of materials (AISI 304, 316, 316L, Ti, etc) used in tubes was considered to be a constant for all of them. This part of the program has been enhanced so that thermal conductivity behaves as a variable function depending on temperature. Although the changes in the results are small, this model is more reality-adjusted.
  • Fluids: Fixed a problem that made the column Flow Index Behaviour to be discarded when saving a fluid.
• Geometry:
  • Names in sync: The name of the geometry now is automatically updated so that it keeps in sync with the actual information provided in the geometry.
  • New option in multipass machined headers: When machined headers are used for multipass heat exchangers, it is now possible to select the type of sealings to be used which lead to more or less efficient tubes placing. This option is needed to work with tube layouts according to the HRS P-Series models list.
    • When O'Rings + Housings (recommended option) are selected the Geometry calculation will perform an extra step in order to move the tubes belonging to each pass away from tubes belonging to adjacent passes and free space for the o'rings and the housings for them. For this reason also, the Minimum tube hole to tubeplate edge (D) (see Clearances & Spacing) must be bigger: 4.5mm when o'rings are used. The program will try to separate the passes so that there are no adjacent tubes in different passes with a distance smaller than 2 times the Minimum tube hole to tubeplate edge (D) (i.e. 9mm for default values). These shifts might require the supression of some tubes. A restriction that applies in order to be able to calculate these cases is that all passes must have the same number of tubes and be distributed radially from the center of the shell.
      
    • On the other side, when Gasket is selected there is no need to separate tubes among different passes and the value of Minimum tube hole to tubeplate edge (D) can be reduced down to 3mm. In these cases the geometries offer higher tube densities, but the usage of this seals might be unapropriate for certain applications applications or lead to impossible construction. In case of doubt discuss with the HRS team.
      
  • Limits in the number of parallel lines: When the number of parallel lines (either in tubes or in shell) raises over 8, a warning message is shown. If as a result of the Overall Calculation the number of parallel lines exceeds 10 an error is shown.
  • A new error condition is checked: Multi pass designs for shell and tube heat exchangers with removable bundles are not allowed. These are limited to one pass option only.
• Overall Calculation:
  • Vertical condensation calculations: The correlation for vertical condensation has been improved.
• Help & Documentation: There is a new section for manual and documentation which is also directly available within the program by pressing the 'F1' key. The help pages will be improved and completed through the next months.
• Other minor bug fixes and improvements.