Use of EMCS recorded data to identify potential savings due to improved HVAC operations and maintenance
Additional Document Info
In most chiller and boiler central plants, the energy management and control systems (EMCS) continuously monitor and record key operation parameters and energy production. A method was developed to identify potential operations and maintenance (O&M) savings by using the EMCS-recorded data. This method was applied to a central plant that supplied heating and cooling to a university campus with a total building floor area of 3.5 million ft2 (325,000 m2). It was found that the potential savings from improved O&M were $2,651,000 per year, which included $1,934,000 per year from improved operation of air-handling units (AHU) on the campus, $673,000 per year from improved chiller operation, and $44,000 per year from improved boiler operation. The improved AHU operation was fully or partially implemented in a number of buildings. The measured O&M savings ($610,000, per year, or 22.5%) were consistent with predicted savings in five buildings where both the pre-O&M and the post-O&M energy consumption were measured on an hourly basis.