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Systems and methods for detecting changes in energy usage in a building

  • US 10,739,741 B2
  • Filed: 03/13/2019
  • Issued: 08/11/2020
  • Est. Priority Date: 06/22/2009
  • Status: Active Grant
First Claim
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1. A building management system comprising:

  • a plurality of sensors measuring a physical state or condition and generating sensor data indicating the physical state or condition measured by the plurality of sensors; and

    a controller configured to;

    use first sensor data from the plurality of sensors collected during a first time period to generate one or more first model coefficients for an energy usage model for HVAC equipment, the energy usage model configured to provide an energy usage of the HVAC equipment as a function of one or more model coefficients and one or more variables, wherein the energy usage of the HVAC equipment is an output of the energy usage model, the one or more model coefficients are parameters of the energy usage model, and the one or more variables are inputs to the energy usage model;

    use second sensor data from the plurality of sensors collected during a second time period to generate one or more second model coefficients for the energy usage model;

    generate a test statistic by comparing the first model coefficients and the second model coefficients;

    compare the test statistic with a value; and

    automatically identify a change in the energy usage of the HVAC equipment in response to the test statistic exceeding the value.

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