Question-and-Answer Resource for the Building Energy Modeling Community
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If the building loads are already known, LoadProfile:Plant object can be used to simulate a scheduled demand profile. PlantLoadProfile.idf example file illustrates more. Makeup water usage calculation for all types of cooling towers is described here. Changing drift loss percent, evaporation loss factor etc. affects tower make up water calculations only. They don't affect tower energy use or show whether cooling effect is increased or decreased. If there are models available which describe the behavior you illustrated above, they can perhaps be modeled using PlantComponent:UserDefined. Or a parametric study can be conducted which changes Tower UA along with drift/blowdown/evaporation loss values.
