Grasshopper Docs

Community documentation for Grasshopper add-ons & plugins

00 | Honeybee
01 | Daylight | Material
02 | Daylight | Light Source
03 | Daylight | Recipes
04 | Daylight | Daylight
05 | Energy | Building Program
06 | Energy | Material | Construction
07 | Energy | Schedule
08 | Energy | Set Zone Properties
09 | Energy | HVACSystems
10 | Energy | Energy
11 | THERM
12 | Developers
13 | WIP

Use this component to transform ACH or inifitration per area of facade to m3/s-m2.
Plug the result to the Honeybee setEPZoneLoads component, infiltrationRatePerArea_ or infiltrationRatePerArea_ inputs
For the blowerPressue input, the component assumes a natural pressure differential between indoors and outdoors at 4 Pascals. However, the passive house standard sets this at a low 0.4303.

Inputs

NameIDDescriptionType
HBZones_HBZonesHoneybee zones for which you want to calculate the infiltration or ventilation rates.Goo
Air Flow Rate_airFlowRateA number representing the air flow rate into the HBZone in Air Changes per Hour (ACH). Alternatively this number can be in m3/s per m2 of exposed envelope area if the input below is set to "False." The latter is useful for infiltration, which is typically specified as a unit per area of exposed envelope.Goo
ACHor M3s M2_ACHorM3sM2_Set to "True" to have the airFlowRate above interpreted as ACH. Set to "False" to have itinterpreted as m3/s per m2 of outdoor-exposed zone surface area. This latter is useful for infiltration rates, which are usually defined as an intensity of flow per unit outdoor exposure. The default is set to True for ACH.Goo
Blower Pressure_blowerPressure_A number representing the pressure differential in Pascals (Pa) between indoors/outdoors at which the specified flow rate above occurs. When set to 0 or left untouched, the specified input flow rate to this component will be the same as that output from the component (only the units will be converted and no translation from one pressure to another will occur). However, many blower door tests for infiltration occur at higher pressure differentials of 50 Pa or 75 Pa. You can input this pressure differential here in order to convert the flow rate of this blower door test to typical building pressure flow rates of 4 Pa.Goo

Outputs

NameIDDescriptionType
OutreadMe!Report of the calculationsString
Inf Per Area FacadeinfPerAreaFacadeinfiltrationRatePerArea_Facade in m3/s-m2 (Cubic meters per second per square meter of exterior facade area) that can be plugged into the "Set EnergyPlus Zone Loads" component.Goo
Vent Per Area FloorventPerAreaFloorventilationPerArea in m3/s-m2 (Cubic meters per second per square meter of floor area) that can be plugged into the "Set EnergyPlus Zone Loads" component.Goo
All ExposedallExposedThe geometry of the zone that is interpreted as exposed surface area.Goo
All FloorsallFloorsThe geometry of the zone that is interpreted as floor area.Goo

Video Tutorials

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