source AirChange for ventilated gap
Verfasst: 18 Jul 2023, 07:58
Hi Heiko,
I would like to use the “air exchange with ambient air for a given air change rate” for the simulation of a ventilated air gap and do have the following questions:
1.) I would still discretize the whole gap and assign the source [Airchange] to all grid elements?
2.) I would adapt the material “air” with a higher lambda value (to model the “convection” and not reflecting indirectly the surface resistances) the and assign the surface resistances as contact condition [Air MaterialBoundary] - or just as additional resistance (but the latter would not influence the vapour transport …)?
3.) The this way modelled air exchange would now be able to “discharge” moisture coming from one of the adjacent sides? And on the other hand side, moisture coming in with the air flow could be transferred to the material, if the conditions are such (to model the “condensation” if the surface has respectively low temperature)?
4.) Is there a way to keep track of the moisture change of the ventilation air? Are the MoistureLoadAirChange and MoistureEnthalpyAirChange referred to incoming or outgoing air?
Thanks a lot for clarification!
Alexandra
I would like to use the “air exchange with ambient air for a given air change rate” for the simulation of a ventilated air gap and do have the following questions:
1.) I would still discretize the whole gap and assign the source [Airchange] to all grid elements?
2.) I would adapt the material “air” with a higher lambda value (to model the “convection” and not reflecting indirectly the surface resistances) the and assign the surface resistances as contact condition [Air MaterialBoundary] - or just as additional resistance (but the latter would not influence the vapour transport …)?
3.) The this way modelled air exchange would now be able to “discharge” moisture coming from one of the adjacent sides? And on the other hand side, moisture coming in with the air flow could be transferred to the material, if the conditions are such (to model the “condensation” if the surface has respectively low temperature)?
4.) Is there a way to keep track of the moisture change of the ventilation air? Are the MoistureLoadAirChange and MoistureEnthalpyAirChange referred to incoming or outgoing air?
Thanks a lot for clarification!
Alexandra