Merge pull request #1807 from NREL/fix/issue892

Add smart defaults for evaporative coolers

lib/openstudio-standards/prototypes/common/objects/Prototype.hvac_systems.rb

@@ -4489,10 +4489,16 @@ def model_add_evap_cooler(model,
       programs << avail_program
 
       # Direct Evap Cooler
-      # @todo better assumptions for evap cooler performance and fan pressure rise
+      # @todo better assumptions for fan pressure rise
       evap = OpenStudio::Model::EvaporativeCoolerDirectResearchSpecial.new(model, model.alwaysOnDiscreteSchedule)
       evap.setName("#{zone.name} Evap Media")
+      # assume 90% design effectiveness from https://basc.pnnl.gov/resource-guides/evaporative-cooling-systems#edit-group-description
+      evap.setCoolerDesignEffectiveness(0.90)
       evap.autosizePrimaryAirDesignFlowRate
+      evap.autosizeRecirculatingWaterPumpPowerConsumption
+      # use suggested E+ default values of 90.0 W-s/m^3 for pump sizing factor and 3.0 for blowdown concentration
+      evap.setWaterPumpPowerSizingFactor(90.0)
+      evap.setBlowdownConcentrationRatio(3.0)
       evap.addToNode(air_loop.supplyInletNode)
 
       # Fan (cycling), must be inside unitary system to cycle on airloop