• A robustness improvement has been implemented in pump curve models. Too high pressure differences could previous result in extremely large negative flow rates due to extrapolation from the provided pump curve. The pump will now extrapolate reasomable independently of provided data.
  • Multiple identical pumps operating in parallel can now be modelled by setting a parameter of the pump component to the number of parallel pumps.

Fixed issues

  • Fixed an error in the pump flow curve correlation that fits a polynomial of any order to provided nominal points. This fix will affect simulation results of user models using this particular pump curve implementation.
  • Fixed an error in the pump component, which was previously singular when the speed was set to zero.

Conversion of user libraries

Automatic conversion of user libraries from version 1.3 is supported using the included conversion script convert_to_1.4.mos located under LibraryNameResourcesScripts.


Vapor Cycle 1.4 is based on the Modelon base library 2.5 and Modelica Standard Library 3.2.2. It can be combined with Liquid Cooling Library 1.5.1 and Heat Exchanger Library 1.5.