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1) It seems that you can specify both the evaporation and drift loss of cooling towers (the links are for a single speed cooling tower, but these input fields exist for other types as well. The evaporation rate can be specified as "a fraction of the circulating condenser water flow and varies with the temperature change in the condenser water", expressed in units of [ % / degrees Kelvin]. Hopefully your colleague doesn't have to do to many conversions or assumptions to determine an acceptable value to use.

2) If you just want to model heat generation within a zone and don't care about energy use, you can use the OtherEquipment object. This allows you to model heat gain into a space with a design level and schedule modifier. Otherwise, EMS objects should give you the freedom to do almost anything.