archetypal.template.OpaqueConstruction
- class archetypal.template.OpaqueConstruction(Name, Layers, **kwargs)[source]
Opaque Constructions.
- Properties:
r_value
u_value
r_factor
u_factor
equivalent_heat_capacity_per_unit_volume
specific_heat
heat_capacity_per_unit_wall_area
total_thickness
mass_per_unit_area
timeconstant_per_unit_area
solar_reflectance_index
Initialize an OpaqueConstruction.
- Parameters
Layers (list of archetypal.MaterialLayer) – List of MaterialLayers making up the construction.
**kwargs – Other attributes passed to parent constructors such as
ConstructionBase
.
- property r_value
Get or set the thermal resistance [K⋅m2/W] (excluding air films).
Note that, when setting the R-value, the thickness of the inferred insulation layer will be adjusted.
- property equivalent_heat_capacity_per_unit_volume
Get the equivalent per unit wall volume heat capacity [J/(kg⋅K)].
Hint
“The physical quantity which represents the heat storage capability is the wall heat capacity, defined as HC=M·c. While the per unit wall area of this quantity is (HC/A)=ρ·c·δ, where δ the wall thickness, the per unit volume wall heat capacity, being a characteristic wall quantity independent from the wall thickness, is equal to ρ·c. This quantity for a composite wall of an overall thickness L, is usually defined as the equivalent per unit wall volume heat capacity and it is expressed as \({{(ρ·c)}}_{eq}{{=(1/L)·∑}}_{i=1}^n{{(ρ}}_i{{·c}}_i{{·δ}}_i{)}\) where \({ρ}_i\), \({c}_i\) and \({δ}_i\) are the densities, the specific heat capacities and the layer thicknesses of the n parallel layers of the composite wall.” [ref]
- ref
Tsilingiris, P. T. (2004). On the thermal time constant of structural walls. Applied Thermal Engineering, 24(5–6), 743–757. https://doi.org/10.1016/j.applthermaleng.2003.10.015
- property specific_heat
Get the construction specific heat weighted by wall area mass [J/(kg⋅K)].
- property heat_capacity_per_unit_wall_area
Get the construction heat capacity per unit wall area [J/(m2⋅K)].
Hint
\((HC/A)=ρ·c·δ\), where \(δ\) is the wall thickness.
- property total_thickness
Get the construction total thickness [m].
- property mass_per_unit_area
Get the construction mass per unit area [kg/m2].
- property time_constant_per_unit_area
Get the construction time constant per unit area [seconds/m2].
- property solar_reflectance_index
Get the Solar Reflectance Index of the exposed surface.
Hint
calculation from K-12 AEDG, derived from ASTM E1980 assuming medium wind speed.
- infer_insulation_layer()[source]
Return the material layer index that corresponds to the insulation layer.
- combine(other, method='dominant_wall', allow_duplicates=False)[source]
Combine two OpaqueConstruction together.
- Parameters
other (OpaqueConstruction) – The other OpaqueConstruction object to combine with.
method (str) – Equivalent wall assembly method. Only ‘dominant_wall’ is safe to use. ‘constant_ufactor’ is still weird in terms of respecting the thermal response of the walls and may cause conversion issues with Conduction Transfer Functions (CTFs) in EnergyPlus.
- Returns
the combined ZoneLoad object.
- Return type
- dominant_wall(other, weights)[source]
Return dominant wall construction between self and other.
- Parameters
other –
weights –
- classmethod from_dict(data, materials, **kwargs)[source]
Create an OpaqueConstruction from a dictionary.
- Parameters
materials = {} # dict of materials. data = { "$id": "140300770659680", "Layers": [ { "Material": { "$ref": "140300653743792" }, "Thickness": 0.013 }, { "Material": { "$ref": "140300653743792" }, "Thickness": 0.013 } ], "AssemblyCarbon": 0.0, "AssemblyCost": 0.0, "AssemblyEnergy": 0.0, "DisassemblyCarbon": 0.0, "DisassemblyEnergy": 0.0, "Category": "Partition", "Comments": "", "DataSource": "ASHRAE 90.1-2007", "Name": "90.1-2007 Nonres 6A Int Wall" }
- classmethod generic_internalmass(**kwargs)[source]
Create a generic internal mass object.
- Parameters
**kwargs – keywords passed to the class constructor.
- classmethod from_epbunch(epbunch, **kwargs)[source]
Create an OpaqueConstruction object from an epbunch.
Possible keys are “BuildingSurface:Detailed” or “InternalMass”
- Parameters
epbunch (EpBunch) – The epbunch object.
**kwargs – keywords passed to the LayeredConstruction constructor.
- mapping(validate=True)[source]
Get a dict based on the object properties, useful for dict repr.
- Parameters
validate (bool) – If True, try to validate object before returning the mapping.
- classmethod generic(**kwargs)[source]
Return OpaqueConstruction based on 90.1-2007 Nonres 4B Int Wall.
- property AssemblyCarbon
Get or set the assembly carbon [kgCO2/m2].
- property AssemblyCost
Get or set the assembly cost [$/m2].
- property AssemblyEnergy
Get or set the assembly energy [MJ/m2].
- property Category
Get or set the Category attribute.
- property Comments
Get or set the object comments.
- property DataSource
Get or set the datasource of the object.
- property DisassemblyCarbon
Get or set the disassembly carbon [kgCO2/m2].
- property DisassemblyEnergy
Get or set the disassembly energy [MJ/m2].
- property Layers: List[Union[archetypal.template.materials.material_layer.MaterialLayer, archetypal.template.materials.gas_layer.GasLayer]]
Get or set the material layers.
- property Name
Get or set the name of the object.
- property allow_duplicates
Get or set the use of duplicates [bool].
- duplicate()
Get copy of self.
- extend(other, allow_duplicates)
Append other to self. Modify and return self.
- float_mean(other, attr, weights=None)
Calculates the average attribute value of two floats. Can provide weights.
- get_unique()
Return first object matching equality in the list of instantiated objects.
- property id
Get or set the id.
- in_h(t_kelvin=293.15, delta_t=15, height=1.0, angle=90, pressure=101325)
Get the detailed indoor heat transfer coefficient according to ISO 15099.
This is used for window U-factor calculations and all of the temperature_profile calculations.
- Parameters
t_kelvin (float) – The average between the indoor temperature and the interior surface temperature. Default is 293.15K (20C).
delta_t (float) – The temperature difference between the indoor temperature and the interior surface temperature [C]. Default is 15C.
height (float) – An optional height for the surface in meters. Default is 1.0 m, which is consistent with NFRC standards.
angle (float) – An angle in degrees between 0 and 180. 0 = A horizontal surface with downward heat flow through the layer. 90 = A vertical surface 180 = A horizontal surface with upward heat flow through the layer.
pressure (float) – The average pressure in Pa. Default is 101325 Pa for standard pressure at sea level.
- in_h_c(t_kelvin=293.15, delta_t=15, height=1.0, angle=90, pressure=101325)
Get detailed indoor convective heat transfer coef. according to ISO 15099.
This is used for window U-factor calculations and all of the temperature_profile calculations.
- Parameters
t_kelvin (float) – The average between the indoor temperature and the interior surface temperature. Default is 293.15K (20C).
delta_t (float) – The temperature difference between the indoor temperature and the interior surface temperature [C]. Default is 15C.
height (float) – An optional height for the surface in meters. Default is 1.0 m, which is consistent with NFRC standards.
angle (float) – An angle in degrees between 0 and 180. 0 = A horizontal surface with downward heat flow through the layer. 90 = A vertical surface 180 = A horizontal surface with upward heat flow through the layer.
pressure (float) – The average pressure in Pa. Default is 101325 Pa for standard pressure at sea level.
- in_h_simple()
Get the simple indoor heat transfer coefficient according to ISO 10292.
This is used for all opaque R-factor calculations.
- property inside_emissivity
Get the emissivity of the inside face of the construction [-].
- out_h(wind_speed=6.7, t_kelvin=273.15)
Get the detailed outdoor heat transfer coefficient according to ISO 15099.
This is used for window U-factor calculations and all of the temperature_profile calculations.
- Parameters
wind_speed (float) – The average outdoor wind speed [m/s]. This affects the convective heat transfer coefficient. Default is 6.7 m/s.
t_kelvin (float) – The average between the outdoor temperature and the exterior surface temperature. This can affect the radiative heat transfer. Default is 273.15K (0C).
- out_h_simple()
Get the simple outdoor heat transfer coefficient according to ISO 10292.
This is used for all opaque R-factor calculations.
- property outside_emissivity
Get the hemispherical emissivity of the outside face of the construction.
- property predecessors
Get or set the predecessors of self.
Of which objects is self made of. If from nothing else then self, return self.
- property r_factor
Get the R-factor [m2-K/W] (including air films).
- to_epbunch(idf)[source]
Get a Construction EpBunch given an idf model.
Notes
Will create layered materials as well.
- Parameters
idf (IDF) – An idf model to add the EpBunch in.
- Returns
The EpBunch object added to the idf model.
- Return type
EpBunch
- to_ref()
Return a ref pointer to self.
- property u_factor
Get the overall heat transfer coefficient (including air films) W/(m2⋅K).
- property u_value
Get the heat transfer coefficient [W/m2⋅K] (excluding air films).
- validate()
Validate object and fill in missing values.