Method and system for assessing energy performance

• US 7,243,044 B2
• Filed: 04/22/2005
• Issued: 07/10/2007
• Est. Priority Date: 04/22/2005
• Status: Active Grant

• Current Assignee: Johnson Controls Technology Company (Johnson Controls International plc)
• Original Assignee: Johnson Controls Technology Company (Johnson Controls International plc)
• Inventors: McCalla, Brian
• Primary Examiner(s): Barlow; John
• Assistant Examiner(s): KHUU, HIEN DIEU THI
• Application Number:
  US11/112,646
• Publication Number:
  US 20060241905A1
• Time in Patent Office: 809 Days
• Field of Search: 702/182
• US Class Current: 702/182
• CPC Class Codes: G06Q 10/00 Administration; Management

Abstract

A computerized system and method for benchmarking energy performance in a building are provided. The method includes receiving utility use data for the building, receiving weather data for the building, and computing a best thermodynamic break-even temperature for the building based on the utility use data and the weather data.

Claims

1. A method implemented using a computerized system of benchmarking energy performance in a building of interest, comprising:

receiving utility use data for the building of interest;

receiving weather data for the building of interest;

computing a best thermodynamic break-even (“

TBE”

) temperature for the building of interest based on the utility use data and the weather data;

assessing energy performance of the building of interest by comparing an energy characteristic of the building of interest to at least one other building; and

archiving an energy characteristic of the building of interest in a database.

2. The method of claim 1, further comprising aggregating the utility use data.

3. The method of claim 1, further comprising computing at least one of heating degree days and cooling degree days.

4. The method of claim 1, further comprising determining an initial estimate of how energy is used in the building.

5. The method of claim 1, further including performing linear regression analysis to obtain energy use coefficients for the building.

6. The method of claim 5, wherein the linear regression analysis includes solving at least two equations simultaneously in an iterative process.

7. The method of claim 6, wherein the at least two equations model electrical consumption in the building and electrical demand in the building.

8. The method of claim 7, wherein the at least two equations includes a third equation that models fuel use in the building.

9. The method of claim 8, wherein the fuel use includes all non-electrical energy use.

10. The method of claim 5, further including using the energy use coefficients to diagnose a problem in the building.

11. The method of claim 1, further including normalizing the energy use coefficients to obtain benchmarks regarding energy performance in the building.

12. The method of claim 11, further including using the building performance benchmarks to obtain system performance benchmarks.

13. The method of claim 12, wherein the system performance benchmarks are further obtained by one or both of physically inspecting the building and looking at probability distributions of previously benchmarked buildings.

14. The method of claim 11, wherein the normalizing is performed by comparing the energy use coefficients to a building metric.

15. The method of claim 1, wherein the best TBE temperature is obtained by plotting energy use versus degree days.

16. The method of claim 15, wherein the degree days includes at least one of heating degree days and cooling degree days.

17. The method of claim 15, wherein the energy use includes at least one of electrical use and fuel use.

18. The method of claim 15, wherein the energy use includes at least one of electrical consumption and electrical demand.

19. The method of claim 1, wherein the utility use data is received from at least one of paper invoices and electronic invoices.

20. The method of claim 1, wherein the utility use data is received by scanning paper invoices.

21. The method of claim 1, further including archiving the utility use data and weather data in a database.

22. The method of claim 1, wherein the utility use data is obtained from at least one of an owner of the building, a utility service provider, or a utility bill consolidator.

23. The method of claim 1, wherein the utility use data and weather data cover a similar time period.

24. The method of claim 23, wherein the time period is at least about six months.

25. The method of claim 1, wherein the utility use data is received substantially in real time.

26. A method implemented using a computerized system of benchmarking energy performance in a building of interest, comprising:

receiving utility use data for the building of interest;

receiving weather data for the building of interest;

computing a best thermodynamic break-even (“

TBE”

) temperature for the building of interest based on the utility use data and the weather data;

further including normalizing a set of energy use coefficients to obtain benchmarks regarding energy performance in the building, wherein the normalizing is performed by comparing the energy use coefficients to a building metric, and wherein the building metric is one or more of square feet of the building, number of occupants in the building, and number of beds in the building; and

storing the benchmarks in a database for later use.

27. A method implemented using a computerized system of benchmarking energy performance in a building, comprising:

receiving utility use data for the building;

receiving weather data for the building;

computing a best thermodynamic break-even (“

TBE”

) temperature for the building of interest based on the utility use data and the weather data; and

using a web browser to perform at least one of providing input to the method, invoking the method, and receiving output from the method, wherein at least a component of the computed TBE temperature is stored for later use.

28. A computerized system for benchmarking energy performance in a building of interest, comprising:

a central processing unit (CPU); and

a storage device coupled to the CPU and having information stored therein for configuring the CPU to;

receive utility use data for the building of interest;

receive weather data for the building of interest;

compute a best thermodynamic break-even (“

TBE”

) temperature for the building based on the utility use data and the weather data;

wherein the storage device is further configured to store at least one of the utility use data, the weather data, and the computed TBE temperature for comparison against other buildings.

29. The system of claim 28, wherein the CPU is further configured to aggregate the utility use data.

30. The system of claim 28, wherein the CPU is further configured to compute at least one of heating degree days and cooling degree days.

31. The system of claim 28, wherein the CPU is further configured to determine an initial estimate of how energy is used in the building.

32. The system of claim 28, wherein the CPU is further configured to perform linear regression analysis to obtain energy use coefficients for the building.

33. The system of claim 32, wherein the linear regression analysis is performed by solving at least two equations simultaneously in an iterative process.

34. The system of claim 33, wherein the at least two equations model electrical consumption in the building and electrical demand in the building.

35. The system of claim 34, wherein the at least two equations includes a third equation that models fuel use in the building.

36. The system of claim 35, wherein the fuel use includes all non-electrical energy use.

37. The system of claim 32, further including using the energy use coefficients to diagnose a problem in the building.

38. The system of claim 28, wherein the CPU is further configured to normalize the energy use coefficients to obtain benchmarks regarding energy performance in the building.

39. The system of claim 38, wherein the CPU is further configured to use the building performance benchmarks to obtain system performance benchmarks.

40. The system of claim 39, wherein the system performance benchmarks are further obtained by one or both of physically inspecting the building and looking at probability distributions of previously benchmarked buildings.

41. The system of claim 38, wherein the normalizing is performed by comparing the energy use coefficients to a building metric.

42. The system of claim 28, wherein the best TBE temperature is obtained by plotting energy use versus degree days.

43. The system of claim 42, wherein the degree days includes at least one of heating degree days and cooling degree days.

44. The system of claim 42, wherein the energy use includes at least one of electrical use and fuel use.

45. The system of claim 42, wherein the energy use includes at least one of electrical consumption and electrical demand.

46. The system of claim 28, wherein the utility use data is received from at least one of paper invoices and electronic invoices.

47. The system of claim 28, wherein the utility use data is received by scanning paper invoices.

48. The system of claim 28, wherein the CPU is further configured to archive the utility use data and weather data in a database.

49. The system of claim 28, wherein the utility use data is obtained from at least one of an owner of the building, a utility service provider, or a utility bill consolidator.

50. The system of claim 28, wherein the utility use data and weather data cover a similar time period.

51. The system of claim 50, wherein the time period is at least about six months.

52. The system of claim 28, wherein the utility use data is received substantially in real time.

53. A computerized system for benchmarking energy performance in a building, comprising:

a central processing unit (CPU); and

a storage device coupled to the CPU and having information stored therein for configuring the CPU to;

receive utility use data for the building;

receive weather data for the building;

compute a best thermodynamic break-even (“

TBE”

) temperature for the building based on the utility use data and the weather data, wherein the CPU is further configured to normalize the energy use coefficients to obtain benchmarks regarding energy performance in the building, wherein the normalizing is performed by comparing the energy use coefficients to a building metric, and wherein the building metric is one or more of square feet of the building, number of occupants in the building, and number of beds in the building.

54. A computerized system of benchmarking energy performance in a building, comprising:

a central processing unit (CPU); and

a storage device coupled to the CPU and having information stored therein for configuring the CPU to;

receive utility use data for the building;

receive weather data for the building; and

compute a best thermodynamic break-even (“

TBE”

) temperature for the building based on the utility use data and the weather data;

wherein the system of benchmarking is configured to use a web browser to cause the CPU to perform at least one of providing input to the system, invoking the system, and receiving output from the system, and wherein at least a component of the computed TBE temperature is stored for later use.

55. A method of assessing energy performance of a building of interest, comprising:

defining a set of benchmarks for a building of interest, comprising;

collecting historical utility use data for the building of interest,

collecting weather data over substantially the same geographic area and time period as the collected utility use data for the building of interest,

solving at least one building equation to identify a plurality of building coefficients using at least one of the collected utility use data and collected weather data,

normalizing the building coefficients using at least one of a building metric and collected weather data;

archiving the defined set of benchmarks in a database; and

comparing the benchmarks against at least one other building, wherein the at least one other building is a building from a normalized set of building data.

56. The method of claim 55, wherein the building coefficients are building-wide energy performance coefficients.

57. The method of claim 55, wherein the building coefficients include building energy use coefficients and specific system energy use coefficients.

58. The method of claim 55, wherein solving the building equation finds six building coefficients that result in the best fit for at the at least one building equation.

59. The method of claim 55, further comprising using a first defined set of benchmarks to define additional building benchmarks.

60. The method of claim 55, wherein normalizing the building coefficients includes dividing an identified building coefficient by a building metric and wherein the building metric is square footage of the building of interest.

61. The method of claim 55, wherein normalizing the building coefficients includes creating a benchmark that may be used to compare the building of interest to other buildings in geographically diverse locations.

62. The method of claim 55, wherein normalizing the building coefficients includes normalizing an identified building coefficient by a determined number of heating days.

63. The method of claim 55, wherein normalizing the building coefficients includes normalizing an identified building coefficient by a determined number of cooling days.

64. The method of claim 55, wherein normalizing the building coefficients includes normalizing using both a building metric and collected weather data.

65. The method of claim 55, wherein archiving the defined set of benchmarks in a database includes archiving the defined set of benchmarks in a database that may be used for comparisons to future buildings of interest.

66. The method of claim 55, wherein comparing the benchmarks against at least one other building includes comparing the benchmarks against buildings across any climate.

67. The method of claim 55, wherein comparing the benchmarks against at least one other building includes comparing the benchmarks against widely geographically diverse buildings.

68. The method of claim 55, further comprising using the defined set of building benchmarks to determine a defined set of system benchmarks.

69. The method of claim 55, further comprising making an initial identification of energy usage, and wherein the initial identification is used to select the at least one building equation to use for building analysis.

70. The method of claim 69, wherein solving at least one building equation includes determining a best fit line to the selected at least one building equation using at least one of the collected utility use data and collected weather data.

71. The method of claim 70, wherein solving at least one building equation is fully automated.

72. The method of claim 70, further comprising:

displaying a graph to a user; and

allowing the user to make a final best fit determination.

73. The method of claim 70, wherein determining a best fit line makes use of linear regression analysis.

74. The method of claim 55, wherein solving at least one building equation is solving for the best thermodynamic break-even temperature.

75. The method of claim 74, wherein solving for the best thermodynamic break-even temperature includes searching for the best thermodynamic break-even temperature based on the use of two or more building equations simultaneously.

76. The method of claim 75, wherein solving for the best thermodynamic break-even temperature includes plotting energy use versus degree days.

77. The method of claim 76, wherein the degree days includes at least one of heating degree days and cooling degree days.

78. The method of claim 77, wherein energy use includes at least one of electrical consumption and electrical demand.

79. The method of claim 55, wherein the building metric is one or more of square feet of the building, number of occupants in the building, and number of beds in the building.

80. The method of claim 55, further including using a web browser to perform at least one of providing input to the method, invoking the method, and receiving output from the method.

81. The method of claim 55, further including using a web browser to display building coefficients.