|Title||Using Whole-Building Electric Load Data in Continuous or Retro-Commissioning|
|Publication Type||Conference Paper|
|Year of Publication||2011|
|Authors||Phillip N Price, Johanna L Mathieu, Sila Kiliccote, Mary Ann Piette|
|Conference Name||19th National Conference on Building Commissioning|
|Conference Location||Cincinnati, OH|
Whole-building electric load data can often reveal problems with building equipment or operations. In this paper, we present methods for analyzing 15-minute-interval electric load data. These methods allow building operators, energy managers, and commissioning agents to better understand a building's electricity consumption over time and to compare it to other buildings, helping them to 'ask the right questions' to discover opportunities for electricity waste elimination, energy efficiency, peak load management, and demand response. For example: Does the building use too much energy at night, or on hot days, or in the early evening? Knowing the answer to questions like these can help with retro-commissioning or continuous commissioning.
The methods discussed here can also be used to assess how building energy performance varies with time. Comparing electric load before and after fixing equipment or changing operations can help verify that the fixes have the intended effect on energy consumption.
Analysis methods discussed in this paper include: ways to graphically represent electric load data; the definition of various parameters that characterize facility electricity loads; and a regression-based electricity load model that accounts for both time of week and outdoor air temperature. The methods are illustrated by applying them to data from commercial buildings. We demonstrate the ability to recognize changes in building operation, and to quantify changes in energy performance.
Some key findings are:
|LBNL Report Number||LBNL-5057E|