That roomair model was developed for office-type spaces that are interior zones. For example, hot or cold exterior walls will drive air movement that leads to a different airflow pattern in the space than the one that model is intended for. Your zone has much higher ceilings and quite different internal gains than a typical side-wall displacement ventilated office. There is no simple roomair model available for your specific type of space, so you could try it. Check that the results for different subzone temperatures are reasonable though.
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Jean marais
Sent: Tuesday, April 24, 2012 2:40 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: RoomAirModel - RoomAirSettings:ThreeNodeDisplacementVentilation
Anyone?
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jean marais" <jeannieboef@...> wrote:
>
> io ref:
> "The model should be used with caution in zones which have large heat gains or losses through exterior walls or windows or which have considerable direct solar gain."
>
> Can someone elaborate why? I have a factory 12 x 90 x 150 m with 25% skylight/roof so large solar gains an high machine heat gains (CNC milling machines) and 15 W/m² lighting.
>
> Supply air is brought in at 0-1 m and exhaust is up at ceiling height.
>
> Any clarification is welcome.
>
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