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Use of EMCS Recorded Data to Identify Potential Savings Due to Improved HVAC Operations & Maintenance (O&M)
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In most chiller and boiler central plants, the energy management and control systems (EMCS) monitor and record key operation parameters and energy production continuously. A method was developed to identify potential O&M savings by using the EMCS recorded data. This method was applied to a central plant which supplied heating and cooling to a University Campus with a total building floor area of 3.5 million square feet. It was found that the potential savings from improved O&M were $2,65 1,00O/yr which included $1,934,000/yr from improved AHU operation on the campus, $673,00O/yr from improved chiller operation, and $44,00O/yr from improved boiler operation. The improved AHU operations were fully or partially implemented in a number of buildings. The measured O&M savings ($610,00O/yr or 22.5%) were consistent with predicted savings in five buildings where the LoanSTAR program measured both pre- O&M and post O&M energy consumption on a hourly basis. The savings from implemented chiller and boiler O&M improvements need to be evaluated using the EMCS data.
Liu, M.; Zhu, Y.; Claridge, D. E. (1996). Use of EMCS Recorded Data to Identify Potential Savings Due to Improved HVAC Operations & Maintenance (O&M). Energy Systems Laboratory (http://esl.tamu.edu); Texas A&M University (http://www.tamu.edu). Available electronically from