def window_material_by_name(material_name):
"""Get an window material from the library given the material name.
Args:
material_name: A text string for the name of the material.
"""
try: # see if the material has already been loaded to a Python object
return _idf_window_materials[material_name]
except KeyError: # material likely needs to be loaded from standards data
try:
_mat_dict = _window_standards_dict[material_name]
except KeyError: # material is nowhere to be found; raise an error
raise ValueError(
'"{}" was not found in the window energy material library.'.
format(material_name))
# create the Python object from the standards gem dictionary
if _mat_dict['material_type'] == 'StandardGlazing':
_mat_obj = EnergyWindowMaterialGlazing.from_standards_dict(_mat_dict)
elif _mat_dict['material_type'] == 'SimpleGlazing':
_mat_obj = EnergyWindowMaterialSimpleGlazSys.from_standards_dict(
_mat_dict)
elif _mat_dict['material_type'] == 'Gas':
_mat_obj = EnergyWindowMaterialGas.from_standards_dict(_mat_dict)
else:
raise ValueError(
'Standards gem material type "{}" is not recognized.'.format(
_mat_dict['material_type']))
_mat_obj.lock()
_idf_window_materials[
material_name] = _mat_obj # next time, it will be loaded faster
return _mat_obj
def test_simple_sys_to_from_standards_dict():
"""Test the initialization of EnergyMaterial objects from standards gem."""
standards_dict = {
"name": "U 0.52 SHGC 0.39 Simple Glazing",
"material_type": "SimpleGlazing",
"u_factor": 0.52,
"solar_heat_gain_coefficient": 0.39,
"visible_transmittance": 0.31
}
mat_1 = EnergyWindowMaterialSimpleGlazSys.from_standards_dict(
standards_dict)
assert mat_1.name == 'U 0.52 SHGC 0.39 Simple Glazing'
assert mat_1.u_factor == pytest.approx(0.52 * 5.678, rel=1e-3)
assert mat_1.shgc == pytest.approx(0.39, rel=1e-2)
assert mat_1.vt == pytest.approx(0.31, rel=1e-2)