Retro-commissioning (RCx) is the fine-tuning of existing buildings and systems to make them operate optimally and more efficiently. Unlike retrofitting which involves replacing outdated equipment, RCx focuses on improving the efficiency of what is already in place. Through scheduling, sequencing, controls programming, and optimizing set points, RCx projects can make a positive difference in a facility’s work environment. It can also extend the service life of your equipment.
When you should consider it
It might be a good time to conduct retro-commissioning if you are:
- Establishing a baseline of your energy performance
- Looking for energy-saving opportunities for your building and existing equipment
- Having challenges with heating and cooling your building
- Managing a building where the occupancy or work function has changed
- Experiencing issues with equipment and system performance
- Noticing unexpected increases in your building’s energy costs and use
- Trying to obtain or improve a green building certification for your building
What problems it uncovers
Some of the more common problems identified by retro-commissioning are:
- Outside air dampers stuck in the always open or always closed position
- Adjustable speed drives that no longer adjust properly
- Unconnected flexible ductwork
- Belts and valves that are malfunctioning
- Control systems components that do not properly respond to their prescribed control sequences
- Incorrect sequences of operation
- Energy management systems that have not been updated to reflect system modifications
- Changed facility uses that affect personnel loading and partition configuration changes that cause
- suboptimal airflow
- Thermostats and control sensors that are improperly placed, out of calibration, or permanently overridden
- Equipment problems due to long-term storage of equipment, such as breakdown of dielectrics, degraded
- fluids, failed batteries, leaking seals, and flattened bearings
- Systems that are simultaneously heating and cooling the same spaces
How you benefit
- Receive expert advice and support on your building’s overall energy performance
- Uncover hidden problems that may be making your building less efficient
- Reduce operating costs by improving equipment and system performance
- Improve employee productivity and comfort with greater temperature control