Cardinal Local School District
House Bill 264 Energy Conservation Program
The Brewer-Garrett Company has established a commitment as an ongoing energy partner with the Cardinal School District. Brewer-Garrett provided cost savings solutions, which included lighting retrofits, boiler replacements, demand control ventilation and building automation system upgrades.
The T8 linear fluorescent lighting retrofits included replacing the fluorescent T8, 32W lamps and electronic ballasted fixtures with the new electronic ballasts at a low ballast factor and 25W T8 lamps. In the gymnasium and multi-purpose rooms the metal halide lamps were replaced with more efficient T5-HO fixtures.
At the high school and middle school the Brewer-Garrett team analyzed the boiler system to determine the current efficiency. The team found the boilers to be operating at 64% efficiency, and recommendations were made to replace the two boilers with newer more efficient boiler models.
Building automation system upgrades included a new Tridium based system that would interface with the boiler controls, as well as managing the timeclocks currently operating the night setbacks to the building AHU zones. This allows for tighter building control by the maintenance personnel and well as off-site monitoring.
The building HVAC system consisted of a large three burner Columbus Heat and Vent system. The unit served as a multizone unit with individual ducts coming from the plenum box to the original building zones. Due to the addition of zones throughout the years, the unit operated with all burners running, as the ducts come off different “chambers” in the plenum box. This negated any possibility of staging the furnace to only respond to the existing need, and on cold days the unit ran 24/7.
The Brewer-Garrett team recommended a retrofit to this unit which involved renovating the inside of the chamber so that all zones would operate off one chamber. This allows for partial gas use, no longer requiring all three burners at once. Additionally, the new burners are modulating, allowing for even further reduction in gas usage.
Contact details for this case study can be provided upon request.