Install Stack Economizer Heat
Client: Department of Veterans Affairs
Location: Atlanta VA Medical Center, Decatur, GA
AKEA developed the design of three boiler flue stack economizers, one common blowdown heat recovery system, and all new controls for three high-pressure boilers to achieve an energy consumption level at least 30 percent below the level achieved under ASHRAE Standard 90.1-2004. An initial energy audit was performed to determine an estimated baseline and cost savings to be utilized in the life cycle cost analysis. Calculations included combustion and fuel to steam efficiencies and fuel input analysis of the existing boilers by performing a stack test and input fuel firing rate analysis for the required 30 percent energy reduction. Additional energy savings were determined by analysis of the system water make-up quantity and cost with energy reduction utilizing a boiler blowdown / make-up tube and bundle heat exchanger. This energy savings analysis determined the lowest acceptable flue gas temperature and the maximum combustion air quantity through the entire range of the boiler operation to determine the most efficient and cost-effective economizer and oxygen control systems for the actual design. This project was a task order under an Atlanta VAMC IDIQ contract for AE services.