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[EnergyPlus_Support] Chilled ceiling with available conrete ceiling for passive cooling

I've been asked to simulate an office with a chilled ceiling (metal plates with tubes filled with cold water).

The office has this chilled ceiling for +- 75% of the surface. 

The ceiling is hanging beneath the concrete ceiling. Leaving a space (+- 20 cm)between them.

This space has to make passive nightcooling possible. At night cool outdoor air can cool the concrete ceiling.

Two questions:

1) modelling the chilled ceiling is no problem. But the concrete wont be 'visible' for natural nightcooling for 75% of the surface. Anyone an idea how to model that ?

2) Is this really effective ? Suppose the concrete ceiling is cooled by natural nightventilation. Does the radiation of the concrete slab has an effect on the buildinguser, if there is a chilled ceiling between them ?



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