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“They took us for a test drive,” said Gleeson. The $20,000 project involved reducing energy usage and improving comfort on the fourth and fifth floors of the county’s Vista Verde Plaza administration building. Occupants of these floors had been complaining about temperature extremes for years, and numerous attempts to fix the problem had always yielded unsatisfactory results.
Alamo Controls installed the WebCTRL system and used its building management functions to define occupancy schedules, adjust setpoints and control other parameters that influence ambient air temperatures. “Up to that point everything was running 24/7,” said Fuentez. After the upgrade, the building’s chiller could be shut down until required. Better control of HVAC systems resolved Vista Verde’s temperature fluctuations and yielded a 25.4% reduction in energy usage. Between January 2004 and August 2005, the county’s investment returned $109,510 in savings.
“The project paid for itself in two months,” said Fuentez. He noted that Alamo Controls was also able to correct an outside air problem as well and improve air quality throughout the building. The firm was subsequently hired to improve energy management at a central plant serving the county’s Courthouse and Justice Center. The WebCTRL system was installed and used to optimize scheduling for the plant’s three chillers, two boilers and associated pumps. The project presented significant technical challenges since the Courthouse was more than 100 years old while the Justice Center was completed in February 2006.
“WebCTRL provides the capability to schedule occupancy times, ensure a comfortable air environment and save energy for two types of environments,” Fuentez said. The browser-based software can be accessed through many types of web-enabled devices over the county’s intranet network. Maintenance staff are able to easily make parameter and schedule changes affecting a broad range of systems and devices. The system’s BACnet communications protocol also provides a 100% open architecture, which ensures interoperability with additional subsystems should they be automated. The application’s trending feature also allows Fuentez to track usage by facility and subsystem. And its reporting feature lets him generate spreadsheet-style reports showing how the control strategy is reducing energy consumption. Both features are helping him change attitudes about the value of using taxpayer dollars for energy management. The reports in particular are demonstrating that small changes in scheduling, occupant behavior and system parameters can have a big impact on operating costs.
Between January 2004 and August 2005, energy use at the Justice Center was reduced by 14.9% for savings of $149,468. During the same period, energy use at the courthouse was reduced by 21.1% for savings of $95,694. Overall, the county has cut energy usage at the facilities by 18.8% for $354,672 in savings. Those figures mean the county has achieved more than three years of mandated savings in just one year.
Fuentez sees many more opportunities for improving productivity and reducing energy consumption. He’d like to extend the WebCTRL system to other county facilities and apply its control capabilities beyond HVAC to include security, lighting, backup power, environmental monitoring and numerous other subsystems. “What we’ve done is just the beginning,” said Fuentez.
Client: Bexar County
Location: San Antonio, TX
Controls Contractor: Automated Logic - Texas, Universal City, TX
Project Type: Replacement
Building Size: 1.5 million square feet (3 buildings)
Reduce natural gas and electricity use
Interoperability with multiple vendor systems, including HVAC, security, lighting, backup power and environmental monitoring
Major Decision Drivers
Browser-based graphic user interface; native BACnet open protocol
HVAC Controls: Automated Logic's WebCTRL® System
Installation Date: 2004
1150 Roberts Blvd.
Kennesaw, GA 30144
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