BMS or EMS? - choosing the right approach for Energy, Demand, Power Quality Management and NABERS Tracking.

This green paper is aimed at Consultants, Sustainability Managers, Facility Managers, Electrical Contractors and Mechanical Services Contractors involved in commercial buildings and facilities. It provides an overview of the features and functionality of BMS and EMS as related to energy usage improvement outcomes.

While there are many similarities in what these two systems do, there are a number of key differences:

  • A BMS is primarily about real-time control. As such, dealing with historical data and other related data is not a primary feature of its design.
  • An EMS is primarily a reporting and decision support tool to drive operational efficiency. As such, it does not require equally stringent real-time performance, but does need a range of out-of-the-box functionality to make it useful for its purpose.

Over time the traditional clear delineation between these two systems has been blurred as EMS functionality is added to BMS and vice versa. However, in most modern deployments of integrated systems that control, monitor and manage energy in commercial buildings and facilities, there is a growing case to support the adoption of both a BMS and an EMS.



John Meehan, Sam Crisafulli, Dennis Henry, Jamie Van Aalst
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