Garage ventilation system in San Francisco achieves 97% energy savings

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“Originally constructed in 1968, the Japan Center garage includes a two-level main and single-level annex structure covering 300,000 square feet altogether. Before the NES system was installed in March 2017, the garage had 45 fan-motor units that were 5-horsepower each. In addition to replacing those motors, NES added variable frequency drive technology.

The NES system controls the rate of ventilation in the main and annex garages based on carbon monoxide concentrations at a given juncture, the company explained. “BACnet-communicating NES carbon monoxide sensors provide instantaneous feedback to NES controllers, which then relay speed commands — via variable frequency drives — to the garage’s exhaust and supply fan motors, increasing and decreasing motor speeds in proportion to carbon monoxide readings.” ”

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