HXL Version 4.0

Heat Exchanger Library 4.0 is part of Modelon's 2025.2 release. New versions of Modelon's libraries are sold and distributed directly from Modelon, as well as approved resellers.

Version 4.0 contains the changes described below.

New features

Redesigned start value dialogs

All heat exchagers have received updated dialogs for the starting point of the fluid. There are both changes to appearance (tab, group and parameter names and descriptions), as well as new ways for specifying the starting point of the fluid.

Name changes

  • The Initialization tab was renamed "Starting point" and in general, the "initial point" is now referred to as the "starting point" instead.
  • Record parameters collecting the fluid starting point values from e.g. "init_liq" to "startingPoint_liq".
  • The selector parameter "initFromEnthalpy" that determined whether a fluid starting point was determined from a given temperature or enthalpy value has been replaced by an enumeration (multiple avaliable selections) named "whatToSet". Change the whatToSet option to access different property combinations to define the starting point.

New options for giving the fluid starting point

Components for refrigerant previously only had the option to give specific enthalpy for points in the two-phase region. In single-phase regions, temperature could alternatively be given.

The new available options are

  • Pressure and temperature or vapor quality. Give a pressure value and select if the fluid is saturated or not. If it is saturated, vapor quality can be given to define the point in the two-phase region. If it is not saturated, temperature is given.
  • Pressure and superheat. Give a pressure value and a superheat (temperature difference above the dew point) to specify a starting point in the vapor region.
  • Pressure and subcooling. Give a pressure value and a subcooling (temperature difference below the boiling point) to specify a starting point in the vapor region.
  • Dew line temperature and superheat. Give the dew line temperature and a superheat value to specify a starting point in the vapor region.
  • Bubble line temperature and subcooling. Give the bubble line temperature and a subcooling value to specify a starting point in the liquid region.

Note on affected results 

  • The refrigerant side of plate type heat exchangers are affected by the bugfix for two-phase channels as described in Modelon Base Library 6.0 release notes. Because of this change, plate heat exchangers operating as condensers will see an increase in flow resistance, and plate heat exchangers operating as evaporators will see a decrease in flow resistance. Plate heat exchangers with single-phase fluids or other geometry types like flat-tube compact heat exchangers or fin-on-tube heat exchangers are not affected. 

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