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 create a THERM boundary condition.


Boundary Curve_boundaryCurveA polyline or list of polylines that coincide with the thermPolygons that you plan to connect to the "Write Therm File" component.Goo
Name_nameAn name for the boundary condition to keep track of it through the creation of the THERM model. If no value is input here, a default unique name will be generated.Goo
Temperature_temperatureA numerical value that represents the temperature at the boundary in degrees Celcius. For NFRC conditions, this temperature should be 21 C for interior boundary conditions and -18 C for exterior boundary conditions.Goo
Film Coefficient_filmCoefficientA numerical value in W/m2-K that represents the convective resistance of the air film at the boundary condition. Alternatively, you can simply input the word 'indoor' or 'outdoor' to have the film coefficient autocalculated based on the position of geometry in the Rhino scene and an interpolation of values from Table 10 from chapter 26 of ASHRAE Fundementals 2013. _ Typical film coefficient values range from 36 W/m2-K (for an exterior condition where outdoor wind strips away most convective resistance) to 2.5 W/m2-K (for a vertically-oriented interior wood/vinyl surface). _ Note that, when inputting 'outdoor', the component will assume an outdoor wind speed of ~4.5 m/s (and a corresponding film coefficient of 26 W/m2-K). You may want to simulate with a lower wind speed of 3.4 m/s (filmCoefficient = 22.7 W/m2-K) or a higher wind speed of 6.7 m/s (filmCoefficient = 34.0 W/m2-K).Goo
Emissivityemissivity_An optional number between 0 and 1 to set an override for the emissivity along the boundary. By default, the Grasshopper components will take the emissivity of the material that is adjacent to the boundary. However, a value here can over-ride this value to account for coatings like those on Low-E glass or matte paint on metallic materials.Goo
Custom Rad EnvcustomRadEnv_A list of radiant environmental properties from the 'Honeybee_Custom Radiant Environment' component. Inputting values here will create a radiant environment that is different than typical NFRC conditions.Goo
U Factor TaguFactorTag_An optional text string to define a U-Factor tag for the boundary condition. U-Factor tags are used tell THERM the boundary on which you would like to compute a U-Value. The default is set to to have no U-Factor tag. This input can be any text string. For example "Frame", "Edge", or "Spacer."Goo
RGBColorRGBColor_An optional color to set the color of the boundary condition when you import it into THERM.Goo


Therm BoundarythermBoundaryA polyline with the specified boudary condition properties, to be plugged into the "boundaries" input of the "Write Therm File" component.Goo

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