nrcan_catalog_creator/opaque_surfaces.py

import configuration as c
import xmltodict
import json
from urllib.request import urlopen


print('start opaque surfaces')

def process_formula(formula, hdd):
  formula = formula.replace('( hdd < ', '').replace(') ', '').split(':')
  for equation in formula:
    values = equation.split('? ')
    if len(values) == 2:
      if float(values[0]) > hdd:
        return float(values[1])
    else:
      return float(equation)


def create_virtual_no_mass_material(u_value, name, materials, construction):
  r_value = 0
  for key in construction:
    if key != 'virtual_no_mass':
      material_thickness = construction[key]
      material_conductivity = 0
      for material in materials:
        if key in material.keys():
          material_conductivity = material[key]['conductivity']
      if material_conductivity != 0:
        r_value += (material_thickness/material_conductivity)
      else:
        r_value += 0
  r_value = 1/u_value - r_value
  new_virtual_no_mass_material = {
      name: {
        "no_mass": True,
        "thermal_resistance": r_value
      }
    }
  materials.append(new_virtual_no_mass_material)


with open(c.nrcan_urls, 'r') as f:
  urls = xmltodict.parse(f.read(), force_list=['standard'])

base_url_construction = urls['nrcan']['@base_url_construction']
dictionary = {"opaque_surfaces": []}
no_mass_index = 0
materials = c.materials['materials']
for standard in urls['nrcan']['standards_per_period']['standard']:
  constructions_location = standard['constructions_location']
  url = f'{base_url_construction}/{constructions_location}'
  _json = json.loads(urlopen(url).read())
  for climate_zone in c.hdd_canadian_climate_zones.keys():
    for table in _json['tables']['surface_thermal_transmittance']['table']:
      if table['surface'] in c.opaque_surfaces:
        u_value = process_formula(table['formula'], c.hdd_canadian_climate_zones[climate_zone])
        layers = {}
        construction = c.surface_types[table['surface']][c.heavy_light[standard["@period_of_construction"]]]
        for key in construction:
          if key != 'virtual_no_mass':
            layers[key] = construction[key]
          else:
            material_name = f'virtual_no_mass_{no_mass_index}'
            layers[material_name] = 0
            no_mass_index += 1
            create_virtual_no_mass_material(u_value,material_name, materials, construction)
        opaque_surface = {
            f'{standard["@period_of_construction"]}_{climate_zone}': {
              "period_of_construction": f'{standard["@period_of_construction"]}',
              "climate_zone": f'{climate_zone}',
              "type": f"{table['boundary_condition']}{table['surface']}",
              "u_value": u_value,
              "layers": layers
            }
          }
        dictionary['opaque_surfaces'].append(
          opaque_surface
          )
output_dictionary = {"opaque_surfaces": dictionary['opaque_surfaces'], "materials": materials}
with open(f'{c.output_path}/opaque_surfaces.json', 'w') as f:
  json.dump(output_dictionary, f, indent=2)