Availability Manager Night Ventilation

asked 2016-11-15 14:58:17 -0600

tmcdanie
21 ●1

updated 2017-08-28 16:14:21 -0600

__AmirRoth__

4446 ●5 ●17 http://bleedinggreenna...

Hello,

Where do I find and/or implement AvailabilityManager:NightVentilation that was released with Openstudio V1.9? I believe it is my solution to below:

I would like my AHU to provide conditioned mixed air during occupied hours. Overnight I would like to bring in unconditioned 100% outside air during a scheduled time (at a specific flowrate).

The trick seems to be getting only the AHU fan to run, without the central heating and cooling coils.

Thank you,

answered 2016-11-16 10:00:42 -0600

aparker

8177 ●4 ●18 http://www.openstudio.net/

AvailabilityManager:NightVentilation isn't available through the GUI, so you'll have to add it via a Measure. Here's a code snippet that should get you started:

# Make a night ventilation availability manager and set inputs
night_vent = OpenStudio::Model::AvailabilityManagerNightVentilation.new(model)
night_vent.setApplicabilitySchedule(model.alwaysOnDiscreteSchedule)
night_vent.setVentilationTemperatureSchedule(some_schedule)
night_vent.setVentilationTemperatureDifference(OpenStudio.convert(5,'R','K').get) # Delta-F to Rankine
night_vent.setVentilationTemperatureLowLimit(OpenStudio.convert(55,'F','C').get) # F to C
night_vent.setNightVentingFlowFraction(0.5)
night_vent.setControlZone(some_zone)
night_vent.setNightVentingFlowFraction

# Attach it to the air loop
air_loop.setAvailabilityManager(night_vent)