Geometry editing for E+ idf files
GeomEppy is a scripting language for use with Eppy, which in turn is a scripting language for EnergyPlus IDF files and output files.
It primarily adds functions to do with IDF geometry, including zones, surfaces, constructions, etc.
Installing GeomEppy for Python 2.7 or 3.5 is a simple as calling pip install geomeppy.
The API for GeomEppy depends on replacing an Eppy IDF object with a GeomEppy IDF object. To use this, you will need to import IDF from GeomEppy rather than directly from Eppy.
In your scripts, use from geomeppy import IDF instead of from eppy.modeleditor import IDF. All other features of the current release version of Eppy will still be available.
GeomEppy then provides a simple Python API for actions on the IDF object:
- Intersecting and matching surfaces
IDF.intersect() # intersects all surfaces
IDF.match() # sets boundary conditions of surfaces
IDF.intersect_match() # intersect surfaces then set/update boundary conditions
- Moving an IDF
IDF.translate_to_origin() # move the whole IDF close to 0,0 on the x, y axes
IDF.translate([50, 20]) # move the whole IDF to x + 50, y + 20
IDF.translate([0, 0, 10]) # move the whole IDF to z + 10
- Adding windows to external walls
IDF.set_wwr(wwr=0.25) # set a WWR of 25% for all external walls
- Setting constructions
IDF.set_default_constructions() # set a name for each construction in the model
- Viewing a simple 3D representation of an IDF
IDF.view_model() # shows a zoomable, rotatable transparent model
- Get all surfaces in a model
- Get all surfaces in a model of a given type
IDF.getsurfaces('wall') # only works if the surface type has been set in the IDF
- Get all subsurfaces in a model
- Get all subsurfaces in a model of a given type
IDF.getsubsurfaces('window') # only works if the surface type has been set in the IDF
- Automatic geometry building
IDF.add_block(...) # automatically adds a building block to the IDF
This method requires some explanation. The parameters required are:
name : str A name for the block. coordinates : list A list of (x, y) tuples representing the building outline. height : float The height of the block roof above ground level. num_stories : int, optional The total number of stories including basement stories. Default : 1. below_ground_stories : int, optional The number of stories below ground. Default : 0. below_ground_storey_height : float, optional The height of each basement storey. Default : 2.5. zoning : str, optional The rules to use in creating zones. Currently the only option is `by_storey` which sets each storey in the block as a Zone.
The block generated will have boundary conditions set correctly and any intersections with adjacent blocks will be handled automatically. The surface type will be set to wall, floor, ceiling or roof for each surface. Constructions are not set automatically so these will need to be added afterwards in the normal way for Eppy.
GeomEppy also provides some additional functions such as surface.setcoords(...)
wall = idf.newidfobject( 'BUILDINGSURFACE:DETAILED', 'awall', Surface_Type = 'wall') wall.setcoords([(0,0,1),(0,0,0),(1,0,0),(1,0,1)])
- Scaling and rotating buildings and blocks
- Geometry validation and correction
- Geometry simplification
- Better geometry visualisation
- More robust surface intersection and matching in edge cases