nrcan_catalog_creator/transparent_surfaces.py

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

print('start transparent 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)


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

base_url_construction = urls['nrcan']['@base_url_construction']
windows_dictionary = {"transparent_surfaces": []}
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.transparent_surfaces:
        u_value = process_formula(table['formula'], c.hdd_canadian_climate_zones[climate_zone])
        windows_dictionary['transparent_surfaces'].append(
          {
            f'{ table["surface"]}_{standard["@period_of_construction"]}_{climate_zone}': {
              "period_of_construction": f'{standard["@period_of_construction"]}',
              "climate_zone": f'{climate_zone}',
              "shgc": c.shgc_for_canadian_climate_zones[climate_zone],
              "type": table['surface'],
              "frame_ratio": 0,
              "u_value": u_value
            }
          })
with open(f'{c.output_path}/transparent_surfaces.json', 'w') as f:
  json.dump(windows_dictionary, f, indent=2)