Air renewal

[Anonymous]

Hello, I am some problems in solve the air renewal inside the model with natural ventilation. Somebody can help me? I used BC (boundary conditions) with 3m/s of velocity of the air and after some iterations, the velocity of the air increase a lot. That's why my solve is wrong. I will send the file e some pictures. What the process for the validation of this kind of model? Thank you a lot. The link of the model: https://www.dropbox.com/sh/wgll67b57zmrz0x/AACCRkz04VM-6_FM0ZJxIH4Wa?dl=0

[Jon.Wilde · Accepted solution]

I can make a few points that should help 🙂

1. You have an air gap under your building (it's flying!). I suggest you draw the air box in CAD to avoid this
2. Remove the temperature from the outlet, it is likely that this will not be the temperature of the air by this point and the model is overconstrained
3. Remove all internal surface boundary conditions, they can only be applied to internal volumes (heat loads). There is no reason to apply internal pressures or film coefficients

That ought to do it!

Thanks,

Jon

[Anonymous]

Man, you are the best!!! The solve now really worked perfectly!!! Thanks a lot!

[Jon.Wilde]

I am thinking of making it my middle name, Jon 'The Best' Wilde 🙂

Thanks for the feedback, glad I could help!

[Anonymous]

One question more, If I would like to have the results about temperature, PMV and things about internal confort, I need only to insert this things in solve settings or I would have to insert the Boundary conditions (such as temperature in control volume) in the control volume and the wall external of the block. If yes, what BC I would have to insert for to see this results. The same thought could be used for the artifical equipaments? ( exhaust fans and blowers) Thanks!