How to design a water based evaporative HVAC system in Designbuilder/Openstudio?

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I bet you could model the condenser with a Coil:Cooling:Water (attached to a loop with district cooling source set to approximate the cooling capacity/flow rate of incoming seawater) on the exhaust air node of the OutdoorAirSystem, and output HVAC,Sum,Cooling Coil Condensate Volume [m3].

Not sure a water coil in exhaust stream of OA system will work since the coil model needs to be "called" somehow and that is usually accomplished by including the component in the OA Sys equipment list, except in this case the coil air node names would not match up with the OA components in the supply air stream. Maybe there is no test for OA Sys air node names and this might work?

@rraustad thanks, I admittedly didn't really consider limitations with control. I wonder (since the air loop is 100% OA) if it might be more feasible with the water coil on the return side of the air loop instead of the OA system. Or, I suppose if the user is interested in the amount of condensate available in the air leaving the greenhouse there would be ways of post-processing that using air temp/humidity/flow outputs.