Fluids

Fluids

Changing reference temperature used to calculate enthalpy in Pressure-based solver

    • mmoataz
      Subscriber

      I am simulating a heat exchanger that has an input heating power of 30kW on Fluent using a pressure-based solver. To achieve this, I defined a mass-flow-rate inlet boundary condition at the hot air side with the correct inlet temperature and specific heat. However, the enthalpy was not calculated correctly resulting in a less input power of 26kW. The reason for that is that for pressure-based solvers enthalpies are calculated based on reference temperature of 298.15K as shown in the screen shot below taken from Fluent documentation.

    • DrAmine
      Ansys Employee
      It is hard coded. You might though define Cp via UDF and here you provide Tref. Other alternative us to use species model with one component and define standard state enthalpy as required. Other alternative using UDRGM or RGP.
    • mmoataz
      Subscriber
      Thank you DrAmine, I've used species model with one component as you suggested and now I get the correct numbers.
    • DrAmine
      Ansys Employee
      Super.
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