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Computerized Energy Management Systems (EMSs) are being installed in un increasing number of new and existing commercial buildings. While their primary function is to control building systems to save energy and power, many of these systems are also capable of monitoring the building systems and energy use. Using a case study approach, this paper evaluates the monitoring capabilities of the EMSs in two buildings in California. The retrieved data include historical hourly demand and outdoor air temperature, along with either instantaneous status or accumulated run-time data for each end use.

We found that an EMS, in order to monitor building energy performance, must reliably measure parameters that yield energy consumption information (end-use demand is most useful) and store this information long enough so that it can be retrieved. In many cases, minor additions to the hardware and software of an EMS could greatly enhance its monitoring capabilities.

Units: Dual