🔥 HISTORICAL SNAPSHOT — September 7, 2022 — Hottest day in Davis recorded history (116°F peak) — All data from UC Davis PI Web API
GridSignal emblem UC DAVIS RMI Brewery, Winery & Food Pilot Facility
3:53 PM
Historical
Building Energy Overview
PI Telemetry
Building Demand
72.2 kW
Rooftop Solar (PM1+PM2)
17.2 kW
Grid Import (DHWA)
31.0 kW
Load rigidity: Building peaked at 97.2 kW at 1:00 AM — not during this 110°F afternoon. Demand is falling despite record heat. Load factor today: 0.73
Water / Thermal
PI Telemetry
Water Flow
6.8 gpm
🧊 Chilled Water: 32.4 Tons
♨️ Steam: 322.3 lbs/hr
Weather — Davis, CA
NOAA Verified
Evening:
Slow cooling to 97°F by 8 PM
☀️
Fair — Clear skies
110°F
Humidity: 11% · Dew Point: 44°F
Wind: SSW 10 mph · Pressure: 29.78 in
🔥
EXTREME HEAT — Record Day
Davis reached 116°F today — tying the all-time record (NOAA, since 1893). Peak building load was at 1:00 AM (97.2 kW), not during afternoon heat.
Why This Day Matters
Context
September 7, 2022 — hottest day in Davis recorded history (116°F, NOAA).
  • Building peaked at 1:00 AM (97.2 kW) — driven by overnight thermal processing, not cooling.
  • At 3:53 PM (110°F), demand is 72.2 kW — 26% below the overnight peak.
  • Chilled water rose from 24 to 32 tons — but process load dominates over HVAC response.
  • This is load rigidity: even record heat doesn't reshape the demand profile.
Campus Solar Arrays
PI Telemetry
Parking Array
50.8 kW
Rooftop PM1
8.7 kW
Rooftop PM2
8.5 kW
Parking array (50.8 kW) feeds campus distribution — outside microgrid boundary (r = −0.097). Rooftop PV (17.2 kW combined) serves the building directly.
Cost Index
SMUD CITS-1
Extreme
$10.72/hr
Tariff Period: Summer On-Peak
Demand Charge: $9.96/kW (peak)
Energy Rate: $0.1492/kWh
24-Hour Demand & Thermal — Sep 7, 2022
PI Telemetry
Demand (kW) Rooftop PV (kW) Chilled Water (tons÷2)
Occupant Guidance
Automated
Keep Windows Closed
Extreme heat: 110°F outside. No natural ventilation benefit until after midnight.
Solar Info
Afternoon — Past Solar Noon
Time Until Sunset
3h 36m
Sunrise
6:42 AM
Sunset
7:29 PM
Snapshot Time
Frozen
Wednesday, September 7, 2022
  • SMUD Tariff Period: Summer On-Peak
  • Day type: Weekday (non-holiday)
  • Outside temp: 110°F
12
3
6
9
Data Provenance
Verified
Source
Signal
Status
PI Web API
electricity_kw
✓ 125 readings/hr
PI Web API
dhwa_real_power_kw
✓ 106 readings/hr
PI Web API
solar_pm1_kw + pm2_kw
✓ 4 readings/hr
PI Web API
solar_parking_kw
✓ 4 readings/hr
PI Web API
chilled_ton
✓ 7 readings/hr
PI Web API
steam_klbph
✓ 48 readings/hr
PI Web API
water_gal
✓ 18 readings/hr
NOAA/WU
Weather observations
✓ Hourly (KSMF)
USNO
Sunrise/Sunset
✓ Davis, CA
All building telemetry from UC Davis PI historian. Weather verified via Weather Underground (KSMF station). Sunrise/sunset from USNO. Solar times from NOAA.