{
  "title": "Chicago O\u2019Hare TMY3 free-cooling weather screen",
  "author": "Anvilfield",
  "reviewed": "2026-11-05",
  "weather_url": "https://energyplus-weather.s3.amazonaws.com/north_and_central_america_wmo_region_4/USA/IL/USA_IL_Chicago-OHare.Intl.AP.725300_TMY3/USA_IL_Chicago-OHare.Intl.AP.725300_TMY3.epw",
  "weather_sha256": "c7d4efcf93ba316a1d874352e743df5cf137ba5c0e3459eb2dc4b5442d5b7f5c",
  "psychrolib_sha256": "37e08506bdc2e652a77026e7107ece7eaabb1c40997b563b88fe2951385aefdf",
  "script_sha256": "d6a7c551d13ae9191cbea2853f48fd3ef7d4c0d37254868e4a24df790519ff91",
  "dependency_commit": "3066345dc8cf91bf59134147cf917f982c1fce13",
  "psychrolib_version": "2.5.0",
  "units": "SI: degrees C, Pa, hours",
  "humidity_route": "dry-bulb + dew point + station pressure",
  "station": "725300",
  "latitude": 41.98,
  "longitude": -87.92,
  "elevation_m": 201,
  "time_zone": "UTC-6 local standard time; no daylight saving",
  "dataset": "TMY3, NREL TMY Data Set 2008",
  "header_period": "Period of Record 1973-2005 (Generally)",
  "manual_source_windows": [
    "1976-2005",
    "1991-2005"
  ],
  "raw_timestamps": "Source year retained; month/day; hour 1..24; minute 0",
  "normalized_timestamps": "Nominal non-leap month/day; hour h represents [h-1,h); hour 24 ends next day; preserve sequence",
  "interval_h": 1,
  "supply_c": 15,
  "return_c": 21,
  "tower_approach_c": 3,
  "hx_approach_c": 2,
  "dry_total_approach_c": 5,
  "full_wet": "wb <= 10",
  "partial_wet": "10 < wb < 16",
  "none_wet": "wb >= 16",
  "full_dry": "db <= 10",
  "schedule": "year-round",
  "operating_exclusions": [],
  "hysteresis": null,
  "delay": null,
  "denominator_h": 8760,
  "valid_h": 8760,
  "unknown_h": 0,
  "reproduce": "python3 calculate.py",
  "scope": "Dataset-specific complete Chicago verifier; adapt required-field validity and unknown-duration handling before using other datasets.",
  "retrieval_command": "curl -fL https://energyplus-weather.s3.amazonaws.com/north_and_central_america_wmo_region_4/USA/IL/USA_IL_Chicago-OHare.Intl.AP.725300_TMY3/USA_IL_Chicago-OHare.Intl.AP.725300_TMY3.epw -o weather",
  "files": {
    "weather": "c7d4efcf93ba316a1d874352e743df5cf137ba5c0e3459eb2dc4b5442d5b7f5c",
    "psychrolib.py": "37e08506bdc2e652a77026e7107ece7eaabb1c40997b563b88fe2951385aefdf",
    "PSYCHROLIB-LICENSE.txt": "3372ab6db04ab898605cd8a4c47eee35e668d14ca05481f00107239be0e3b46e",
    "calculate.py": "d6a7c551d13ae9191cbea2853f48fd3ef7d4c0d37254868e4a24df790519ff91",
    "hourly-results.csv": "720ffc55d45a62de8856f2390e3e611d6893300e8a604bc2f87fcd09a20b88dc",
    "results.json": "cf2edcc1844463a65d7d3130e28cce1a38479c17ad567ec7b2dbdda81e6eea1f"
  }
}