small thermal zones

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Dear all,

I am currently developing an energy model for a mall building. In this mall there are hundreds of small retail units, each including a tiny service toilet for employee use (<5m2).

In such a large scale, I am seeing how my model thermal zones are x2 because of these small toilets, but I cannot find any standard of indication/recommendation on how to model these spaces or whether they should be merged with the zone they serve.

Does anyone have had a similar issue? do you know any standard that defines these spaces or how to deal with them? I believe since the size and the loads are not significant they should be merged along with the areas that provide service, which on the other hand is a conservative scenario energy-wise since these areas will have a larger load overall.

We are trying to simplify the model since the simulation time will increase considerably the more the number of zones, and thus the complexity of any consequent data post process.

I will be grateful to hear about previous experiences in this matter or similar.

Thanks