AIR CONDITIONING LIBRARY RELEASE INFORMATION

 

Air Conditioning version 1.8.6

 

Available for: Dymola 2014 FD01

DependenciesModelica Standard Library Version: 3.2.1

Conversion: None from 1.8.4 and 1.8.5

  • This release is based on MSL 3.2.1. Due to some structural modifications in the Modelica.Media base classes, small changes in ThermoFluidPro were necessary. Therefore, this version of AirConditioning is only compatible with MSL 3.2.1. Regression tests comfirmed unchanged simulation results for the models in this library, in some rare cases convergence of steady-state initialization was influenced. AirConditioning 1.8.5 is identical to version 1.8.6, but still based on MSL 3.2 and is recommended to be used instead in case MSL 3.2 is the chosen Modelica base library.


Air Conditioning version 1.8.5

 

Available for: Dymola 2014 FD01

DependenciesModelica Standard Library Version: 3.2

Conversion: None from 1.8.4

  • A new information section is included directly in the library, with guidelines on component testbench and cycle initialization.
  • Handling of refrigerant properties at the receiver outlet is improved for low or zero-flow simulations.
  • In- and outlet pressures, enthalpies and pressures in heat exchanger summary records properly take into account headers, in case those are activated. Previously, only the active heat exchanger part was considered for temperature and enthalpy variables. Enthalpy deviations from previous results are only expected, if heat transfer between headers is possible, temperature may be slighthly different in the two-phase region, due to the additional pressure drop in the headers. This concerns only summary variables, other model variables are unaffected.
  • The variability of correction factors for heat transfer and pressure drop in heat exchangers (CF_ ...) has been increased. They are now declared as input variables, which may change over time. As a feature request by many users, this increases the flexibility for user defined modifications. The default behavior of existing models is not expected to change. Manual steps may be required for the conversion of models for pressure drop and heat transfer correlations, which were copied and modified from previous versions of the library. Please, contact support, if you experience problems.
  • Display units in the four-value display visualizer are corrected to be consistent with the actual value.
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