— Energy Readiness · Healthcare
100,000 sq ft 24×7 hospital: ~529,000 kWh/yr in play
Problem. A hospital engineering team scoping a BMS and lighting-controls programme on a 100,000 sq ft, 24×7 building needs an early sense of the annual electricity a coordinated energy pass could address. With continuous clinical operation the baseline is large, so a defensible first-pass number matters before any detailed measurement.
Answer. At a hospital energy-performance index of 340 kWh/m²/yr across ~9,290 m², this configuration models a baseline near 3.16 million kWh/yr, of which about 16.75 percent — close to 529,000 kWh/yr — is addressable through HVAC, lighting and scheduling measures. That band carries roughly 376 tonnes of CO₂ a year at the CEA grid factor of 0.71 kg/kWh.
02 / In depth
How this preset reads — the engineering view.
The model applies a BEE-style EPI to floor area and an operating-hours factor. A 24×7 hospital sits at a midpoint EPI of 340 kWh/m²/yr — four times a typical office — with roughly 50 percent HVAC and 15 percent lighting. The addressable band uses the same ASHRAE 90.1 / BEE midpoints (16 percent of HVAC, 35 percent of lighting, 3.5 percent of total), which for this heavier, less lighting-weighted mix resolve to about 16.75 percent.
The 100,000 sq ft input converts to ~9,290 m² (÷ 10.7639). Multiplying 340 × 9,290 gives a baseline near 3.16 million kWh/yr; 16.75 percent of that is close to 529,000 kWh/yr addressable, carrying roughly 376 tonnes of CO₂ a year. Note the contrast with the office preset: the far higher EPI and larger area produce a much larger absolute kWh headline, yet at a slightly lower percentage because lighting — the highest-yield category — is a smaller share of a hospital's load.
Raising floor area or the operating-hours factor increases the absolute kWh in play monotonically, since both enlarge the baseline. The percentage is fixed by the hospital use-mix and moves only if that mix changes — which is why a bigger hospital shows a bigger kWh headline at the same ~16.75 percent. Separate the two readings: the kWh is the area-and-hours story, the percentage is the use-mix story.
For a hospital, energy is only part of the case. This tool models addressable energy alone — it does not model clinical resilience, redundancy, emergency-power continuity, infection-control airflow or statutory compliance, all of which usually drive a hospital BMS more than energy does. It also excludes the installed plant, real occupancy and tariff detail, so treat the output as a screening figure that frames the energy conversation, not the whole business case.
What this preset deliberately does not solve
- Screening estimate from EPI midpoints — not a metered saving or an audit result.
- Models energy only — not resilience, redundancy, emergency power or compliance, which usually lead a hospital BMS.
- The percentage reflects the hospital use-mix; the kWh headline scales with area and 24×7 hours.
How this preset differs from its siblings
The sibling office preset models a much lower EPI (85 vs 340 kWh/m²/yr) over a smaller, 12-hour footprint, so it shows a smaller absolute kWh saving at a slightly higher percentage — lighting is a larger share of an office load. Use this hospital preset for a 24×7 clinical building where continuous operation sets a very large baseline and BMS scope extends well beyond energy; use the office preset for a daytime commercial retrofit where lighting and HVAC are the primary levers.
03 / Hydrated calculator
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