ACL Version 2.0

AirConditioning Library 2.0 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 2.0 is updated to be compliant with Modelon Base Library 6.0.

New features

  • New heat transfer correlation added ChevronMartinSinglePhase, the correlation was added to replicate the behaviour of a deprected ChevronPlateHX in the new ChevronPlateLCLCoolantHX
    • .
  • Coolant pipes and related components have been added to PipesAndVolumes in the library. These components can be used as replacements for deprecated coolant pipe models and these components supports coolant media also. The new coolant-related components include:
    • StaticPipe
    • DistributedPipe
    • LiquidSplit
    • LiquidJunction
  • CoolantRefrigerantHXHorizontal and CoolantRefrigerantHXVertical Heatexchangers are enhanced with three types of flow schemes such as
    • Cross flow
    • Counter flow and
    • Counterflow at odd passes and co-current at even passes
  • Headers have been added to both the inlet and outlet sides of the coolant-side heat exchanger models. These header sections enable calculation of the overall pressure drop (dp_coolant). The following Heatexchanger model has the coolant headers TwoPhaseLiquid, LiquidAir in addition to the refrigeration headers.

Bug fixes

  • For "layered" heat exchangers, an error was fixed, that when computing friction factor and colburn factor the depth of a single layer was used, instead of the total heat exchanger depth. This caused inconsistencies in air pressure loss and heat transfer results between these components and corresponding standard heat exchanger components. Simulation results of existing models will be affected when using geometry-based performance correlations for louvered fins. Affected heat exchanger components are:
    • AirConditioning.HeatExchangers.TwoPhaseAir.LayeredVertical
    • AirConditioning.HeatExchangers.TwoPhaseAir.LayeredHorizontal
  • New "CoolantSplitHX" and "CoolantMixHx" components have been added to the library to support the new LCL coolant media. Deprecated versions of both components are still available for compatibility.
    The paths of the newly added components are:
    • AirConditioning.PipesAndVolumes.CoolantSplitHX
    • AirConditioning.PipesAndVolumes.CoolantMixHX
  • Errors were fixed in the MoistAir medium model that cased incorrect results when computing absolute humidity from relative humidity or vice versa at temperatures above the boiling temperature of water. The affected media model classes are the BaseProperties class and the functions relativeHumidity, relativeHumidity_pTX & Xsaturation. This bug caused the air source component to provide incorrect humidity at it fluid port if the specified temperature was above the water boiling temperature. This bug fix will affect simulation results if moist air is used above the liquid boiling point temperature.

Improvements

  • The volume component inside the check valve has been changed from quasistatic behavior to dynamic behavior. The previous behavior can be restored by changing the parameter back to the old default.

Back to top