refrigeration_system: Tank attached to Coil:WaterHeating:Desuperheater isn't connected to anything

[jmarrec]

In current develop, and also in V940IOFreeze, the test fails due to this NREL/OpenStudio#4011 which doesn't translate a WaterHeater:Mixed if not on a plantloop or with enough schedules to produce stand alone operation.

OpenStudio-resources/model/simulationtests/refrigeration_system.rb

Lines 160 to 172 in 0cc3e8d

	water_tank = OpenStudio::Model::WaterHeaterMixed.new(model)
	water_tank.setAmbientTemperatureIndicator("ThermalZone")
	water_tank.setAmbientTemperatureThermalZone(z)
	#Schedule Ruleset
	setpointTemperatureSchedule = OpenStudio::Model::ScheduleRuleset.new(model)
	setpointTemperatureSchedule.setName("Setpoint Temperature Schedule")
	setpointTemperatureSchedule.defaultDaySchedule.setName("Setpoint Temperature Schedule Default")
	setpointTemperatureSchedule.defaultDaySchedule.addValue(OpenStudio::Time.new(0,24,0,0), 70)
	desuperheater = OpenStudio::Model::CoilWaterHeatingDesuperheater.new(model, setpointTemperatureSchedule)
	water_tank.setSetpointTemperatureSchedule(setpointTemperatureSchedule)
	desuperheater.addToHeatRejectionTarget(water_tank)
	desuperheater.setHeatingSource(water_cooled_condenser)

The test is wrong, not the SDK: there is no point at all connecting a coil desuperheater to a tank that actually serves no uses. This is going to produce a deviation in EUI though, so either leave it as is (but this issue explains it), or rewrite the history by re-running the tests... the OSM test is from 1.3.0, so that means rerunning ALL versions back to 2.0.4 (which takes quite some time).