Retro Commissioning (RCx) is the process of evaluating and optimizing existing building systems to improve energy efficiency and operational performance. The RCx process identifies low-cost or no-cost solutions to restore optimal system performance, which results in:
Reduced energy use
Improved indoor air quality
Increased occupant comfort
Lower maintenance costs
Extended equipment lifespan
Buildings tend to deviate from their original operational intent over time. Equipment wears out, usage patterns change, and inefficiencies build up. Retro-commissioning can help address these inefficiencies by:
Identifying and correcting operational issues such as equipment settings, calibration, and control strategies.
Maximizing energy efficiency without significant capital investments.
Aligning building performance with sustainability goals and certifications like LEED or ENERGY STAR.
Energy Savings
Retro-commissioning focuses on optimizing the efficiency of energy-consuming systems, leading to 10-20% reductions in overall energy costs.
Lower Operating Costs
With RCx, buildings can experience reduced utility bills and maintenance costs due to enhanced system performance and less equipment downtime.
Improved Indoor Air Quality and Comfort
Fine-tuning HVAC and ventilation systems results in more consistent indoor temperatures and improved air quality, leading to a better working environment.
Prolonged Equipment Lifespan
Retro-commissioning ensures that systems are operating within design parameters, reducing wear and tear on equipment, which extends their useful life.
Compliance with Sustainability Certifications
RCx can help buildings meet the criteria for certifications like LEED, Green Globe, and ENERGY STAR, increasing the overall marketability and environmental responsibility of the property.
The RCx process typically follows these steps:
Initial Assessment and Data Collection:
Inspect building systems such as HVAC, lighting, and controls. Collect operational data and energy use patterns.
Identify Improvement Opportunities:
Analyze the data to identify inefficiencies, such as incorrect equipment settings, underperforming systems, or unnecessary energy consumption.
System Optimization and Tuning:
Recalibrate, adjust, and fine-tune systems to optimize performance. This could include scheduling HVAC systems, adjusting control settings, or balancing airflows.
Implementation of Low-Cost/No-Cost Measures:
Implement energy-saving solutions that don’t require significant capital investment, such as adjusting thermostat setpoints or correcting operational schedules.
Monitoring and Verification:
Continuously monitor system performance to ensure improvements are maintained over time, ensuring long-term energy savings.
Retro Commissioning often follows an ASHRAE Level 1 or 2 energy audit, and it works hand-in-hand with benchmarking services. After conducting RCx, we can benchmark your building’s performance using tools like the ENERGY STAR Portfolio Manager to track energy use and CO2 emissions over time.