in openstudio. is the output variable "zone air temperature" dry bulb temperature or wet bulb temperature?

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Drybulb. It's generally agreed that when people say temperature without being further explicit, they mean drybulb. If they actually mean wetbulb (or dewpoint or ...), they'd have to specify that in the name.

You can find descriptions of output variables in the EnergyPlus documentation. For example, here.