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

Patent metadata

Field	Value
Publication number	US-9286582-B2
Application number	US-201113252092-A
Country	US
Kind code	B2
Filing date	Oct 3, 2011
Priority date	Jun 22, 2009
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

A computer system for use with a building management system for a building includes a processing circuit configured to determine a building's baseline energy usage model. The processing circuit may be configured to determine one or more automatically selected variables for use in the baseline energy usage model for predicting energy use in a building. The processing circuit may be further configured to cause the display of the one or more automatically selected variables on a user interface device. The processing circuit may be configured to receive, from the user interface, a selection of one or more variables which differ from the one or more automatically selected variables. The processing circuit may be further configured to use the received selection to generate a new baseline energy usage model.

First claim

What is claimed is:

1. A method for generating a baseline energy usage model for a building management system comprising:
receiving, at a processing circuit, an initial set of variables for potential use in a baseline energy usage model for predicting energy use in a building;
performing, by the processing circuit, statistical hypothesis testing on each of the initial set of variables to determine which of the initial set of variables are statistically significant to the energy use in the building, the statistical hypothesis testing comprising:
generating a first set of coefficients for the baseline energy usage model based on the initial set of variables;
removing one of the variables from the initial set of variables to create a subset of the initial set of variables;
generating a second set of coefficients for the baseline energy usage model based on the subset of the initial set of variables; and
calculating a test statistic for the removed variable using a difference between the first set of coefficients and the second set of coefficients and comparing the calculated test statistic to a critical value;

automatically selecting, by the processing circuit, one or more of the initial set of variables for use in the baseline energy usage model based on a result of the statistical hypothesis testing, wherein a variable is selected for use in the baseline energy usage model when the test statistic calculated for the variable exceeds the critical value;
causing the one or more automatically selected variables to be displayed on a user interface device;
receiving, at the user interface, a selection of one or more variables which differ from the one or more automatically selected variables; and
using the selection of the one or more variables which differ from the one or more automatically selected variables to generate a new baseline energy usage model.

2. The method of claim 1 , wherein the selection of the one or more variables which differ from the one or more automatically selected variables comprises a selection of one or more time periods.

3. The method of claim 1 , wherein the new baseline energy usage model is generated by applying regression analysis to the selection of the one or more variables which differ from the one or more automatically selected variables.

4. The method of claim 1 , further comprising:
receiving, at the user interface device, a selection of an override parameter, wherein the new baseline energy usage model is generated based on the selection of the override parameter.

5. The method of claim 1 , further comprising:
receiving, at the user interface device, a selection of a data source;
retrieving comparison data from memory based on the selection of a data source; and
using the retrieved comparison data to determine an energy consumption.

6. The method of claim 5 further comprising:
comparing the comparison data to the baseline energy usage model; and
causing an indication of the comparison to be displayed by the user interface device.

7. The method of claim 1 , further comprising:
validating that two or more selected variables have overlapping timeframes; and
causing a warning to be displayed by the user interface device based on the comparison.

8. The method of claim 1 , further comprising:
generating a graph using the baseline energy consumption model; and causing the graph to be displayed by the user interface device.

9. The method of claim 6 , further comprising:
generating a graph based on the comparison; and
causing the graph to be displayed by the user interface device.

10. The method of claim 1 , further comprising:
receiving, at the user interface, different selections to test generating different baseline energy usage models.

11. A system for generating a baseline energy usage model for a building management system comprising:
a processing circuit configured to receive an initial set of variables for potential use in a baseline energy usage model for predicting energy use in a building,
wherein the processing circuit is further configured to perform statistical hypothesis testing on each of the initial set of variables to determine which of the initial set of variables are statistically significant to the energy use in the building, the statistical hypothesis testing comprising:
generating a first set of coefficients for the baseline energy usage model based on the initial set of variables;
removing one of the variables from the initial set of variables to create a subset of the initial set of variables;
generating a second set of coefficients for the baseline energy usage model based on the subset of the initial set of variables; and
calculating a test statistic for the removed variable using a difference between the first set of coefficients and the second set of coefficients and comparing the calculated test statistic to a critical value;

wherein the processing circuit is further configured to automatically select one or more of the initial set of variables for use in the baseline energy usage model based on a result of the statistical hypothesis testing, wherein a variable is selected for use in the baseline energy usage model when the test statistic calculated for the variable exceeds the critical value,
wherein the processing circuit is further configured to cause the one or more automatically selected variables to be displayed on a user interface device,
wherein the processing circuit is further configured to receive, from the user interface, a selection of one or more variables which differ from the one or more automatically selected variables, and
wherein the processing circuit is further configured to use the selection of the one or more variables which differ from the one or more automatically selected variables to generate a new baseline energy usage model.

12. The system of claim 11 , wherein the selection of the one or more variables which differ from the one or more automatically selected variables comprises a selection of one or more time periods.

13. The system of claim 11 , wherein the new baseline energy usage model is generated by applying regression analysis to the selection of the one or more variables which differ from the one or more automatically selected variables.

14. The system of claim 11 , wherein the processing circuit is further configured to receive, from the user interface device, a selection of an override parameter, wherein the new baseline energy usage model is generated based on the selection of the override parameter.

15. The system of claim 11 , wherein the processing circuit is further configured to receive, from the user interface device, a selection of a data source; wherein the processing circuit is configured to retrieve comparison data from memory based on the selection of a data source; and wherein the processing circuit is further configured to use the retrieved comparison data to determine an energy consumption.

16. The system of claim 15 , wherein the processing circuit is further configured to compare the comparison data to the baseline energy usage model and to cause an indication of the comparison to be displayed by the user interface device.

17. The system of claim 11 , wherein the processing circuit is further configured to validate that two or more selected variables have overlapping timeframes and to cause a warning to be displayed by the user interface device based on the comparison.

18. The system of claim 11 , wherein the processing circuit is further configured to generate a graph using the baseline energy consumpt

Assignees

• Drees Kirk H
• Kummer James P
• Wenzel Michael J
• Johnson Controls Tech Co

Inventors

• Drees Kirk H
• Kummer James P
• Wenzel Michael J

Classifications

• H02J3/003 Primary

  Load forecast, e.g. methods or systems for forecasting future load demand · CPC title

• H02J2103/30

  Simulating, planning, modelling, reliability check or computer assisted design [CAD] of electric power networks · CPC title

• H02J13/13

  characterised by the transmission of data to equipment in the power network · CPC title

• G05F1/66

  Regulating electric power · CPC title

• G06Q10/06 Primary

  Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling · CPC title