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Ethylene Glycol Water Mixtures wrong Specific Heats leads to wrong cooling loads

ioncube
2023-03-23
2023-03-24
  • ioncube

    ioncube - 2023-03-23

    I am attaching a sim file where specific heats for EG-H2O mixture plays an important role in determing cooling loads.

    The actual values are 3.7-3.8 for 40% w.t ...but DWSIm puts it at 1.6kJ/kg.K


    source: https://simulationresearch.lbl.gov/modelica/releases/v9.1.0/help/Buildings_Media_Antifreeze_EthyleneGlycolWater.html

     
    • Daniel Medeiros

      Daniel Medeiros - 2023-03-23

      the actual value depends on the property package + enthalpy/cp method selected.

       
  • Daniel Medeiros

    Daniel Medeiros - 2023-03-23

    you should have used an activity coefficient model instead of PRSV2.

     
  • ioncube

    ioncube - 2023-03-24

    I will do that ...can you provide an excample of how to use 'Property override' in this case for Cp

     
    • Daniel Medeiros

      Daniel Medeiros - 2023-03-24

      open the viscosity override sample, the procedure is similar

       
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