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Historic Sioux City Federal Building Earns Energy Star

Dec. 4, 2014

Exterior view of the Sioux City Federal Building and CourthouseThe historic Sioux City Federal Building and U.S. Courthouse recently received the first Environmental Protection Agency Energy Star Award in its 80-year history.

The building, which was added to the National Register of Historic Places in 2013, was recognized by the EPA for conserving energy better than 84 percent of similar facilities of its size and type nationwide.

This accomplishment directly supports GSA goals for sustainability and the reduction of greenhouse gases.

Iowa Field Office associates’ efforts made a significant impact on energy reduction at the Sioux City facility. This included such work as installing LED lamps to replace incandescent and less efficient lighting, and working with the building mechanics to limit the peak energy demands by staging equipment loads. The field office team’s work has improved the quality and efficiency of delivered tenant services.

Along with operational fine-tuning, significant infrastructure upgrades have been performed at the Sioux City facility over the last few years. Seven outdated air handling units were replaced with damper-controlled air flow units; this method utilizes variable frequency drives to modulate fan speed and air flow, reducing electrical costs. A new centrifugal Magnetic Levitation Daiken chiller was installed, which used 18 percent less electricity in August 2014 compared with the previous year and showed a savings of 18,000 kilowatt-hours (kwh) and $1,000. That equipment’s projected annual cost savings is almost $4,000 and 72,000 kwh.

Other actions taken included reducing or eliminating boiler operation during summer months for system reheat coils; adjusting run times of heating and cooling systems to meet building requirements rather than using a set schedule for operation; and reducing boiler header temperatures, static pressures and fan speeds.

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