Effective. Efficient. Excellent.
As part of Aetna’s participation in the Connecticut Energy Efficiency Fund (CEEF) Retro-Commissioning Program, Colliers Project Leaders was retained to provide Aetna’s Home Office in Hartford, CT with a building survey, retro-commissioning investigation, implementation services, training, and measurement and verification for four buildings encompassing 1,800,000 square feet of office space.
- The objectives of the retro-commissioning initiative included:
- Improve overall energy consumption and operating performance
- Improve the building’s ENERGY STAR rating
- Identify system operation, control and maintenance issues
- Reduce occupant complaints and improve indoor environment
- Develop persistence strategies to ensure improvements stand over time
As a result, we proposed the implementation of the following energy conservation measures:
- Optimization of secondary CHW pumping station
- Enhance tertiary CHW pumping station
- Upgrade 8 large AHUs and add pressurization control for the Rogers Building
- Improve controls for 7 snow melt systems
- Improve controls & sequences for the steam boiler combustion air system
- Add DDC seasonal “shut-off” control for existing heating PRVs
- Enhance existing perimeter fan coil unit operation
- Optimize 8 atrium building AHUs
- Modify kitchen and dining area AHUs and correct air pressure imbalances
- Add O2 control for existing steam boiler
- Add VFDs to chilled water plant primary chilled water pumps
