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"""
U-Value calculator module for HVAC Load Calculator.
This module implements the layer-by-layer assembly builder and U-value calculation functions.
"""
from typing import Dict, List, Any, Optional, Tuple
import pandas as pd
import numpy as np
import os
import json
from dataclasses import dataclass, field
# Import data models
from data.building_components import MaterialLayer
from data.reference_data import reference_data
# Define paths
DATA_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
@dataclass
class MaterialAssembly:
"""Class representing a material assembly for U-value calculation."""
name: str
description: str = ""
layers: List[MaterialLayer] = field(default_factory=list)
# Surface resistances (m²·K/W)
r_si: float = 0.13 # Interior surface resistance
r_se: float = 0.04 # Exterior surface resistance
def add_layer(self, layer: MaterialLayer) -> None:
"""
Add a material layer to the assembly.
Args:
layer: MaterialLayer object
"""
self.layers.append(layer)
def remove_layer(self, index: int) -> bool:
"""
Remove a material layer from the assembly.
Args:
index: Index of the layer to remove
Returns:
True if the layer was removed, False otherwise
"""
if index < 0 or index >= len(self.layers):
return False
self.layers.pop(index)
return True
def move_layer(self, from_index: int, to_index: int) -> bool:
"""
Move a material layer within the assembly.
Args:
from_index: Current index of the layer
to_index: New index for the layer
Returns:
True if the layer was moved, False otherwise
"""
if (from_index < 0 or from_index >= len(self.layers) or
to_index < 0 or to_index >= len(self.layers)):
return False
layer = self.layers.pop(from_index)
self.layers.insert(to_index, layer)
return True
@property
def total_thickness(self) -> float:
"""Calculate the total thickness of the assembly in meters."""
return sum(layer.thickness for layer in self.layers)
@property
def r_value_layers(self) -> float:
"""Calculate the total thermal resistance of all layers in m²·K/W."""
return sum(layer.r_value for layer in self.layers)
@property
def r_value_total(self) -> float:
"""Calculate the total thermal resistance including surface resistances in m²·K/W."""
return self.r_si + self.r_value_layers + self.r_se
@property
def u_value(self) -> float:
"""Calculate the U-value of the assembly in W/(m²·K)."""
if self.r_value_total == 0:
return float('inf')
return 1 / self.r_value_total
@property
def thermal_mass(self) -> Optional[float]:
"""Calculate the total thermal mass of the assembly in J/(m²·K)."""
masses = [layer.thermal_mass for layer in self.layers]
if None in masses:
return None
return sum(masses)
def to_dict(self) -> Dict[str, Any]:
"""Convert the material assembly to a dictionary."""
return {
"name": self.name,
"description": self.description,
"layers": [layer.to_dict() for layer in self.layers],
"r_si": self.r_si,
"r_se": self.r_se,
"total_thickness": self.total_thickness,
"r_value_layers": self.r_value_layers,
"r_value_total": self.r_value_total,
"u_value": self.u_value,
"thermal_mass": self.thermal_mass
}
class UValueCalculator:
"""Class for calculating U-values of material assemblies."""
def __init__(self):
"""Initialize U-value calculator."""
self.assemblies = {}
self.load_preset_assemblies()
def load_preset_assemblies(self) -> None:
"""Load preset material assemblies."""
# Create preset assemblies from reference data
# Wall assemblies
for wall_id, wall_data in reference_data.wall_types.items():
# Create material layers
layers = []
for layer_data in wall_data.get("layers", []):
material_id = layer_data.get("material")
thickness = layer_data.get("thickness")
material = reference_data.get_material(material_id)
if material:
layer = MaterialLayer(
name=material["name"],
thickness=thickness,
conductivity=material["conductivity"],
density=material.get("density"),
specific_heat=material.get("specific_heat")
)
layers.append(layer)
# Create assembly
assembly_id = f"preset_wall_{wall_id}"
assembly = MaterialAssembly(
name=wall_data["name"],
description=wall_data["description"],
layers=layers
)
self.assemblies[assembly_id] = assembly
# Roof assemblies
for roof_id, roof_data in reference_data.roof_types.items():
# Create material layers
layers = []
for layer_data in roof_data.get("layers", []):
material_id = layer_data.get("material")
thickness = layer_data.get("thickness")
material = reference_data.get_material(material_id)
if material:
layer = MaterialLayer(
name=material["name"],
thickness=thickness,
conductivity=material["conductivity"],
density=material.get("density"),
specific_heat=material.get("specific_heat")
)
layers.append(layer)
# Create assembly
assembly_id = f"preset_roof_{roof_id}"
assembly = MaterialAssembly(
name=roof_data["name"],
description=roof_data["description"],
layers=layers
)
self.assemblies[assembly_id] = assembly
# Floor assemblies
for floor_id, floor_data in reference_data.floor_types.items():
# Create material layers
layers = []
for layer_data in floor_data.get("layers", []):
material_id = layer_data.get("material")
thickness = layer_data.get("thickness")
material = reference_data.get_material(material_id)
if material:
layer = MaterialLayer(
name=material["name"],
thickness=thickness,
conductivity=material["conductivity"],
density=material.get("density"),
specific_heat=material.get("specific_heat")
)
layers.append(layer)
# Create assembly
assembly_id = f"preset_floor_{floor_id}"
assembly = MaterialAssembly(
name=floor_data["name"],
description=floor_data["description"],
layers=layers
)
self.assemblies[assembly_id] = assembly
def get_assembly(self, assembly_id: str) -> Optional[MaterialAssembly]:
"""
Get a material assembly by ID.
Args:
assembly_id: Assembly identifier
Returns:
MaterialAssembly object or None if not found
"""
return self.assemblies.get(assembly_id)
def get_preset_assemblies(self) -> Dict[str, MaterialAssembly]:
"""
Get all preset material assemblies.
Returns:
Dictionary of preset MaterialAssembly objects
"""
return {assembly_id: assembly for assembly_id, assembly in self.assemblies.items()
if assembly_id.startswith("preset_")}
def get_custom_assemblies(self) -> Dict[str, MaterialAssembly]:
"""
Get all custom material assemblies.
Returns:
Dictionary of custom MaterialAssembly objects
"""
return {assembly_id: assembly for assembly_id, assembly in self.assemblies.items()
if assembly_id.startswith("custom_")}
def create_assembly(self, name: str, description: str = "") -> str:
"""
Create a new material assembly.
Args:
name: Assembly name
description: Assembly description
Returns:
Assembly ID
"""
import uuid
assembly_id = f"custom_assembly_{str(uuid.uuid4())[:8]}"
assembly = MaterialAssembly(name=name, description=description)
self.assemblies[assembly_id] = assembly
return assembly_id
def add_layer_to_assembly(self, assembly_id: str, material_id: str, thickness: float) -> bool:
"""
Add a material layer to an assembly.
Args:
assembly_id: Assembly identifier
material_id: Material identifier
thickness: Layer thickness in meters
Returns:
True if the layer was added, False otherwise
"""
if assembly_id not in self.assemblies:
return False
material = reference_data.get_material(material_id)
if not material:
return False
layer = MaterialLayer(
name=material["name"],
thickness=thickness,
conductivity=material["conductivity"],
density=material.get("density"),
specific_heat=material.get("specific_heat")
)
self.assemblies[assembly_id].add_layer(layer)
return True
def add_custom_layer_to_assembly(self, assembly_id: str, name: str, thickness: float,
conductivity: float, density: float = None,
specific_heat: float = None) -> bool:
"""
Add a custom material layer to an assembly.
Args:
assembly_id: Assembly identifier
name: Layer name
thickness: Layer thickness in meters
conductivity: Thermal conductivity in W/(m·K)
density: Density in kg/m³ (optional)
specific_heat: Specific heat capacity in J/(kg·K) (optional)
Returns:
True if the layer was added, False otherwise
"""
if assembly_id not in self.assemblies:
return False
layer = MaterialLayer(
name=name,
thickness=thickness,
conductivity=conductivity,
density=density,
specific_heat=specific_heat
)
self.assemblies[assembly_id].add_layer(layer)
return True
def remove_layer_from_assembly(self, assembly_id: str, layer_index: int) -> bool:
"""
Remove a material layer from an assembly.
Args:
assembly_id: Assembly identifier
layer_index: Index of the layer to remove
Returns:
True if the layer was removed, False otherwise
"""
if assembly_id not in self.assemblies:
return False
return self.assemblies[assembly_id].remove_layer(layer_index)
def move_layer_in_assembly(self, assembly_id: str, from_index: int, to_index: int) -> bool:
"""
Move a material layer within an assembly.
Args:
assembly_id: Assembly identifier
from_index: Current index of the layer
to_index: New index for the layer
Returns:
True if the layer was moved, False otherwise
"""
if assembly_id not in self.assemblies:
return False
return self.assemblies[assembly_id].move_layer(from_index, to_index)
def calculate_u_value(self, assembly_id: str) -> Optional[float]:
"""
Calculate the U-value of an assembly.
Args:
assembly_id: Assembly identifier
Returns:
U-value in W/(m²·K) or None if the assembly was not found
"""
if assembly_id not in self.assemblies:
return None
return self.assemblies[assembly_id].u_value
def calculate_r_value(self, assembly_id: str) -> Optional[float]:
"""
Calculate the R-value of an assembly.
Args:
assembly_id: Assembly identifier
Returns:
R-value in m²·K/W or None if the assembly was not found
"""
if assembly_id not in self.assemblies:
return None
return self.assemblies[assembly_id].r_value_total
def export_to_json(self, file_path: str) -> None:
"""
Export all assemblies to a JSON file.
Args:
file_path: Path to the output JSON file
"""
data = {assembly_id: assembly.to_dict() for assembly_id, assembly in self.assemblies.items()}
with open(file_path, 'w') as f:
json.dump(data, f, indent=4)
def import_from_json(self, file_path: str) -> int:
"""
Import assemblies from a JSON file.
Args:
file_path: Path to the input JSON file
Returns:
Number of assemblies imported
"""
with open(file_path, 'r') as f:
data = json.load(f)
count = 0
for assembly_id, assembly_data in data.items():
try:
# Create assembly
assembly = MaterialAssembly(
name=assembly_data["name"],
description=assembly_data.get("description", ""),
r_si=assembly_data.get("r_si", 0.13),
r_se=assembly_data.get("r_se", 0.04)
)
# Add layers
for layer_data in assembly_data.get("layers", []):
layer = MaterialLayer(
name=layer_data["name"],
thickness=layer_data["thickness"],
conductivity=layer_data["conductivity"],
density=layer_data.get("density"),
specific_heat=layer_data.get("specific_heat")
)
assembly.add_layer(layer)
self.assemblies[assembly_id] = assembly
count += 1
except Exception as e:
print(f"Error importing assembly {assembly_id}: {e}")
return count
# Create a singleton instance
u_value_calculator = UValueCalculator()
# Export U-value calculator to JSON if needed
if __name__ == "__main__":
u_value_calculator.export_to_json(os.path.join(DATA_DIR, "data", "u_value_calculator.json"))
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