Garage Ventilation System Achieves 96% Energy Savings


Nagle Energy Solutions (NES) announced its garage-ventilation control system is capturing a 96% reduction in the energy consumed by a sizeable mechanical ventilation system installed recently at the City & County of San Francisco’s Sutter Stockton Garage.

The garage demand-control ventilation (DCV) system shaves more than 770,000 kilowatt-hours (kWh) a year from Sutter Stockton’s baseline energy consumption, providing an operational cost savings of $116,000 a year, not including future utility rate increases.

Since commissioning the DCV system at Sutter Stockton, real-time data logging shows it is limiting the energy consumed (measured in kilowatts) by five, new Huntair Fanwall motor units and nine, new stand-alone garage-fan motors providing fresh air in to the garage — and possessing a combined 150 horsepower (HP) running 24/7 — to just 4% of their total full-load capacity.

The NES System also slashes — by 96% —utility fees that otherwise would be incurred running Sutter Stockton’s mechanical ventilation system 8,760 hours per year (24/7) with no means of motor control in place. Doing so would consume in excess of 800,000 kWh annually, which at the garage’s utility rate of $0.15/kWh, amounts to $10,000 a month or $120,000 a year in electric utility fees.

The energy consumed by the garage’s mechanical ventilation system is now limited to less than 2,700 kWh per month, which amounts to an average, monthly cost of $400. At this rate, the energy savings captured by the system throughout its 15-year lifespan will generate a minimum cash inflow exceeding $1.7 million — again, not including future utility rate increases.

The new system will be able to to:

  • Meet the California Energy Code (Title 24) requirement to provide continuous ventilation during garage-occupied hours, which is designed to protect the health and safety of garage employees and patrons; and
  • Minimize the energy consumed by the considerable amount of fan-motor HP required at Sutter Stockton (and the other City garages) to achieve the required maximum ventilation rate – 0.75 cubic feet per minute (cfm) – when carbon monoxide (CO) emissions rise to predetermined thresholds due to traffic in the garage.

Energy efficient initiatives in parking garages are cropping up across the country. In July, the Kravis Center in West Palm Beach, Fla. announced it is upgrading its LED lighting — a move that is expected to cut energy consumption at the cultural arts center by 75%.

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