ACL Version 1.28

AirConditioning Library 1.28 is part of Modelon's 2024.2 release. New versions of Modelon's libraries are sold and distributed directly from Modelon, as well as approved resellers.

Version 1.28 contains the changes described below.

Build 1 (2024-09-15)

Major changes

  • Several changes related to modelling of complex coolant networks. The packages AirConditioning.HeatExchangers and AirConditioning.Heating have been restructured, and new heat exchangers have been added that are compatible to the LiquidCooling library and coolant media. A new template and cycle example using the new heat exchangers has been added as AirConditioning.Examples.CondReceiverChillerCycle_LCLCoolant
    • .

New features

  • Added an example model that shows the usage of a simple superheat controlled electronic expansion valve (EXV) to control evaporator outlet pressure and temperature. The example model can be found under AirConditioning.Examples.SimpleSuperheatControl.
  • Added a moist air dew point temperature sensor at AirConditioning.ControllersAndSensors.DewPointTemperatureSensor.
  • New axial fan model with 2D tables. The axial fan model can be used to specify its fan characteristics as a 2D table when speed and pressure rise are known. The first column for Speed in RPM and first row for pressure rise in Pa. Constant speed and pressure rise is given as input to the fan model to estimate its power consumption and volumetric flow rate.

Enhancements

  • All parameters related to initialization have been moved to a dedicated tab in the parameter dialog to improve usability.
  • The Visualizers package has been restructured and plots with a linear pressure axis have been added. Plots with linear pressure axis are indicated by _linp. Visualizer models without a suffix are using a logarithmic pressure axis.
  • Regenerated the coefficient files for the R744 table based media. Together with the table based media updates listed in Modelon.Information.ReleaseNotes.Version_4_5 this has improved the robustness of a number of models that simulate transcritical pressure operations.

Bug fixes

  • AirConditioning.HeatExchangers.HXAirHandling.AirSplit1_2: When the relative position was set to bottom (relativePosition=2), the air flow properties wrongly used the properties of the top of the inlet parametrization instead of the bottom. This bug was fixed and the model now correctly re-samples the values for both relative position options.
  • AirConditioning.HeatExchangers: The total refrigerant volume (and thus the refrigerant mass charge) in Refrigerant-Air heat exchangers was calculated incorrectly when using non-zero internal header volumes. This has been fixed. The internal header volume (and mass charge) is now included in the summary of the heat exchangers and also correctly summed in AggregateTwoPhaseProperties.
  • AirConditioning.ThermoFluidPro.Receivers.OutFlowFunctions.levelBasedQuality_table: The original linear interpolation for outlet quality based on relative level was replaced by spline interpolation that preserves monotonicity and yields continuous derivatives to enable generating analytical Jacobian.