How to model ceiling destratification fans in E+ ?

asked 2017-11-07 22:22:04 -0500

Hi everyone !

I'm trying to model a hydronic radiant floor supplied by an air-source HP, for both heating & cooling operation. My problem is : for cooling I'd like to model ceiling fans to help with destratification and air-mixing, but I'm not sure what to do.

I am aware that the air model for the zone is fully mixed, so there isn't any stratification during the simulation, but I think that it would still have an impact on the convection transfer. (Stop me if I'm wrong!)

Changing the room air model would probably work, but it seems rather complicated, so I wanted to directly change the convection coefficient for the floor surface. Problem is, to calculate the forced-convection coefficient I need the air velocity around the floor. Any idea how I could get an average value of that, if the fan & room characteristics are known?

I know how to implement the parasite heating and the air velocity for the comfort, my only problem here is to get the convection transfer right. (And to do so, have access to air velocity in the room?)

Any idea how to do otherwise to model the presence of a ceiling fan without too much complication would be welcomed as well !

Thank you very much ! Hope you can help :)

Cheers !


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