Cx Associates commissioned energy efficiency improvements at Burlington International Airport including the upgraded central chilled water system, replacement of two inefficient constant volume dual duct air distribution systems with a VAV system, extensive controls system programming upgrades, and lighting efficiency upgrades. CxA conducted design review for the central cooling plant and air system and heating plant upgrades. Many of our design review comments had a positive impact on system performance, especially part load operational efficiency. We estimate that our design review of the chiller plant controls alone saved the airport 150,000 kWh/year (20% of full load), worth $19,000/year. In addition, CxA worked with BTV to implement Building Performance Metrics and Monitoring to enable the building operators to maintain system performance over time.
Cx Associates conducted a retrocommissioning qualification study for the chilled water plant at the Southwestern Vermont Medical Center. Our review of the facility focused on its chilled water plant, the BAS, as well as pumps and the cooling tower. Our study resulted in four measures we recommended to the owner. These four measures resulted in estimated annual savings of $17,000, which would result in a payback period of just 1.4 years.
We provided design and sequences of operation for an upgrade to Fanny Allen Hospital’s aging Building Automation System (BAS). This upgrade resulted in an increase in the facility’s Energy Star score from 15 to 31. Our team based our design on the not-yet-released ASHRAE Guideline 36 and implemented leading edge efficiency measures in the control of the HVAC systems.