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Geometry editing for E+ idf files

Project description

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GeomEppy is a scripting language for use with Eppy, which in turn is a scripting language for EnergyPlus IDF files and output files.

API

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

  • Adding windows to external walls

IDF.set_wwr(wwr=0.25)  # set a WWR of 25% for all external walls

  • Viewing a simple 3D representation of an IDF

IDF.view_model()  # shows a zoomable, rotatable transparent model

IDF.add_block(...)  # automatically adds a building block to the IDF

This method requires some explanation. The parameters required are:

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)])

Forthcoming

  • Scaling and rotating buildings and blocks
  • Geometry validation and correction
  • Geometry simplification
  • Better geometry visualisation

Installation

Installing GeomEppy for Python 2.7 is a simple as calling pip install geomeppy.

Python 3 is currently unsupported while we await a fully-compatible version of Eppy to be released to PyPI.

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