3.0 air_wall_zone_mixing fd04f73e-a530-4144-9e1e-c1878b1394bc 65c3f123-bb44-4515-bfc8-5844b3b1f8a1 20200401T050057Z 772B7164 AirWallZoneMixing Air Wall Zone Mixing This measure replaces conductive heat transfer with zone mixing wherever air walls are used on matched surfaces or sub-surfaces for walls. A user argument is exposed for a coefficient that represents a target air changes per hour (ACH) for a room where the zone volume/the air wall surface area is the same as its zone height. As the room gets deeper the additional airflow per unit of depth decreases. If two zones have different mixing estimates, the lower will be used. If a smaller portion of an inter-zone wall is an air wall, that will also decrease zone mixing airflow. A construction will be hard assigned to the matched surfaces using the air wall, and the then boundary condition will be changed to adiabatic. This will avoid including both air mixing and conductive transfer across zones. Zone mixing objects will also be made for sub-surface air walls, but they can't be made adiabatic unless their base surface also is. A warning will be issued if that happens The formula used to determine the design flow rate is the zone mixing coefficient * zone volume/sqrt(zone volume / (air wall area * zone height). Zone mixing will only be added where there is an air wall and where the matched surfaces belong to spaces in different thermal zones and the base surface type is a wall. Currently floors are not addressed by this measure. Air walls in spaces that are part of the same thermal zone will be left alone. The intended use case is a single base surface that spans the room or one or more sub-surface that spans a portion of it. If you have multiple air wall base surfaces matched between the same zones you may get higher than expected zone mixing. zone_mixing_coef Cross Mixing Coefficient Cross Mixing flow rate = zone mixing coefficient * zone volume/sqrt(thermal zone volume/(air wall area*zone height)) Double true false 1 add_zone_mixing_variables Add Zone Mixing Output Variable Requests Boolean true false true true true false false HVAC.Distribution Measure Type ModelMeasure string Intended Software Tool Apply Measure Now string Intended Software Tool OpenStudio Application string Intended Software Tool Parametric Analysis Tool string example_model.osm osm test AD3A8B94 SimpleTest.osm osm test 38ED88B9 README.md md readme C272754F example_a.png png doc 210227A0 example_b.png png doc F7EB82AD example_c.png png doc 5445EC4B example_d.png png doc B36DBCB3 measure_logs.png png doc B65B478C simulation_results.png png doc C7E7739D timeseries_results.png png doc 95902986 LICENSE.md md license E0468DD6 air_wall_zone_mixing_test.rb rb test D78B91B3 OpenStudio 2.0.0 2.8.0 measure.rb rb script 58F69028