3.1 fan_assist_night_ventilation 5e77cb11-0fa9-432b-97bd-87c40949ee1f 7b02dbeb-897a-41f6-8c48-e987e9474ae5 2024-11-16T23:47:46Z 26DDAE64 FanAssistNightVentilation Fan Assist Night Ventilation This measure is meant to roughly model the impact of fan assisted night ventilation. The user needs to have a ventilation schedule in the model, operable windows where natural ventilation is desired, and air walls or interior operable windows in walls and floors to define the path of air through the building. The user specified flow rate is proportionally split up based on the area of exterior operable windows. The size of interior air walls and windows doesn't matter. It's up to the modeler to choose a flow rate that is approriate for the fenestration and interior openings within the building. Each zone with operable windows will get a zone ventilation object. The measure will first look for a celing opening to find a connection for zone a zone mixing object. If a ceiling isn't found, then it looks for a wall. Don't provide more than one ceiling paths or more than one wall path. The end result is zone ventilation object followed by a path of zone mixing objects. The fan consumption is modeled in the zone ventilation object, but no heat is brought in from the fan. There is no zone ventilation object at the end of the path of zones. In addition to schedule, the zone ventilation is controlled by a minimum outdoor temperature. The measure was developed for use in un-conditioned models. Has not been tested in conjunction with mechanical systems. To address an issue in OpenStudio zones with ZoneVentilation, this measure adds an exhaust fan added as well, but the CFM value for the exhaust fan is set to 0.0 design_flow_rate Exhaust Flow Rate Double cfm true false 1000 fan_pressure_rise Fan Pressure Rise Double Pa true false 500 efficiency Fan Total Efficiency Double true false 0.65 ventilation_schedule Choose a Ventilation Schedule. Choice true false min_outdoor_temp Minimum Outdoor Temperature Double F true false 55 HVAC.Ventilation Measure Type ModelMeasure string Intended Software Tool Apply Measure Now string Intended Software Tool OpenStudio Application string Intended Software Tool Parametric Analysis Tool string Intended Use Case Model Articulation string LICENSE.md md license 8C5A8023 README.md md readme D87E7C11 README.md.erb erb readmeerb 703C9964 OpenStudio 2.0.0 2.0.0 measure.rb rb script E96BE908 FanAssistNightVentilationMeasureGuide.pdf pdf resource 374EC8C7 1028_night_purge_test_192.osm osm test B5B5CCA9 EdgeTest.osm osm test 57D36626 demo_a.osm osm test 6E213AF1 example_model.osm osm test 6643C1A7 fan_assist_night_ventilation_test.rb rb test CC3F5531 no_opp_win.osm osm test B4E2D89E