Partition walls inside same zone

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Thanks for your answer. So, in normal practice (regardless of simulation software), do modelers include partition walls or not?

Also, just to mention, my model take a bit longer to simulate if I combine rooms into different zones and when I leave each room as a separate zone then the computation time is a bit less (half a minute difference). Any ideas, which is the best practice (leave rooms as separate zones or combine them)?

As a consultant primarily using OS I include partition walls to account for thermal mass. Whether or not the spaces are grouped into a single thermal zone depends on the actual HVAC design and modeling simplifications I might choose. For example, when working on a large model (800,000+ ft2 currently) I would group thermal zones by exposure and use zone multipliers to reduce sim time.

@MatthewSteen: The Zone Multiplier will help when you have same dimension zones, right? Also, @MJWitte mentioned in This thread that combining zones can increase simulation time due to increase in internal thermal radiant exchange. So this means it is OK to leave rooms as separate zones. Agree or any comments?

Yes, it's meant to be used when the model has multiple zones with the same attributes. It's important to differentiate between spaces and zones. Spaces are unique to OS providing a way to partition zones and can be thought of as a child object of an EP zone. I don't know what you're trying to model - a research scenario or a design scenario - so I can't comment on which approach is more appropriate, combining rooms into a single zone or separating into individual zones. What equipment is serving the rooms/zones and where are the thermostats?