1 Reply Latest reply on Jul 26, 2018 9:21 AM by Bill McEachern

    CFD on fin and tube condenser coil

    Syed Ali

      Hello everyone,

       

      I am very new to CFD (Student), and wanted to learn it for the fun of it. I've made a fin and tube condenser coil, and I tried to do a simple CFD on it, but I keep getting 3 warnings.

      1. Unresolved boundary Condition, Condition name : Environment Pressure 1, Inlet Mass Flow 1

      2. Unresolved Region, Condition name: Fluid Subdomain 1.

       

      Basically I want to simulate a airflow through the condenser at 96F and 2700 CFM. The working fluid inside the Condenser is suppose to be R410A with inlet givens: 350 PSI, 140F Superheated, mass flow: 260lb/hr. I want to know the heat transfer coefficient of the aluminum fins. I set this up as a external flow.

       

      I do not know what I am doing wrong, Please enlighten me with knowledge .

        • Re: CFD on fin and tube condenser coil
          Bill McEachern

          This is very complicated problem not something to cut your teeth on. you need to do one of the tutorial problems with multiple flow domains. The try a very small sub section of the fin and tube HX - like 5 fins and symmetry on either side with a short section of tube going through it - put it in a wind tunnel type box with ideal walls would be my suggestion. Then try something with a porous media in it. then try and figure out the heat exchange coefficients to apply to the porous media that give the same over all heat transfer as your little fin and tube model. Then remove the fins from the big model and replace it with the porous media. It is a bit brief but hopefully you get the general idea. It is not really practical to model all the fins directly and get a good result in reasonable time.