The end-use disaggregation function separates bulk energy consumption into its major constituent end-uses and calculates its energy use intensities.

Energy is used in various ways throughout a building. Some of it is used to power baseboard heaters, some of it for the chillers and cooling coils inside the air handling units (AHU), and some of it is used to make coffee and display spreadsheets. Though buildings are typically equipped with energy meters which monitor bulk energy consumption, most buildings still lack adequate submetering that can disaggregate energy use into its constituent end-uses and allowing operators and energy managers to monitor the flow of energy within a building and help identify anomalous consumption.

The end-use disaggregation function disaggregates bulk energy use into common major end-uses and calculates the total energy use intensities of each major end-use. The major end-uses for electricity are lighting and plug-loads, distribution (i.e., pumps and fans), and chillers. The major end-uses for heating energy use are perimeter heating devices, the AHUs’ heating coils, and other appliances (i.e., domestic hot water). The major end-use for cooling energy are the AHUs’ cooling coils. This function can help the user assess the distribution of energy consumption within a building and can be used to identify abnormal energy use patterns. To illustrate energy use patterns, a visual is generated which plots weekly energy use intensity of the major end-uses for electricity, cooling, and heating energy use separately.

NOTE: This function may not be suitable for buildings with other significant electricity end-uses such as elevators and data centers, unless such end-uses are separated from the energy meter data prior to uploading the data.