The city of Marietta completed infrastructure upgrades at City Hall, the police and fire departments and municipal court buildings, which is expected to save about $90,000 annually in energy, operations and maintenance costs.
Trane, a global provider of indoor comfort systems and solutions, provided high-efficiency heating, ventilation and air conditioning (HVAC) solutions combined with energy-saving advanced system controls for the upgrades.
City leaders expect the infrastructure upgrades to save $71,000 in annual energy costs and reduce annual maintenance costs by $19,000.
The $560,000 in HVAC infrastructure upgrades were funded through an energy efficiency and conservation block grant (EECBG) provided by the U.S. Department of Energy under the American Recovery and Reinvestment Act of 2009 (ARRA).
"We were able to fully maximize the grant dollars to perform the system upgrades," Marietta Redevelopment Corporation executive director Reggie Taylor, who coordinated the project for the city, said in a press release.
"These improvements make good sense beyond the fiscal and environmental benefits," Trane account executive Cameron Griffith said in the release. "Research has shown that steps such as those Marietta has taken to improve the working environment can actually increase employee productivity and reduce sick days."
The project reduces the city's carbon footprint by approximately 490 metric tons of greenhouse gas emissions (metric tons of carbon dioxide equivalent) per year, the equivalent emissions savings from planting approximately 12,000 new trees or removing 96 cars from the road per year.
Energy-Saving Upgrades Meet City Needs
Before the upgrades were installed, engineering company CDM Smith performed an energy audit of City Hall and the public safety complex buildings, including the Marietta Police Department, Marietta Municipal Court and Marietta Fire Department headquarters. The energy audit identified energy-conservation measures that will best provide increased economic efficiency with maximum long-term benefits. CDM Smith also provided engineering services to the city throughout the entire project including design, bid and construction management.
- Provide enhanced monitoring and control of HVAC systems throughout buildings
- Make facilities employees' jobs easier and less costly to perfor
City Hall Improvements
- Direct digital control (DDC) building controls replace original pneumatic building controls
- DDC controls use wireless thermostats with timed override buttons for limited HVAC during unscheduled hours
- Replacement of all air distribution variable air volume (VAV) boxes
- New building automation system can be accessed remotely online for trouble-shooting building systems and operations
- New building automation system includes complex control algorithms for HVAC system to reduce energy use and maximize efficiency, including control of existing chilled water systems, air handling units, all new VAV boxes and two new high-efficiency condensing boilers (new boilers were installed under separate contract)
- In addition, new premium-efficiency HVAC motors replaced old motors, and variable frequency drives were added at pump and fan motors to work with new control algorithms
Upgrades at Public Safety Complex Buildings
- Integration of existing building automation system into new Trane building automation system, along with advanced control algorithms to maximize energy efficiency
- Existing thermostats were replaced with new digital thermostats equipped with timed override to reduce energy usage and maximize efficiency