A pattern-based automated approach to building energy model calibration

TitleA pattern-based automated approach to building energy model calibration
Publication TypeJournal Article
Year of Publication2015
AuthorsSun, Kaiyu, Tianzhen Hong, Sarah C. Taylor-Lange, and Mary Ann Piette

Building model calibration is critical in bringing simulated energy use closer to the actual consumption.This paper presents a novel, automated model calibration approach that uses logic linking parameter tuningwith bias pattern recognition to overcome some of the disadvantages associated with traditional calibrationprocesses. The pattern-based process contains four key steps: (1) running the original precalibratedenergy model to obtain monthly simulated electricity and gas use; (2) establishing a patternbias, either Universal or Seasonal Bias, by comparing load shape patterns of simulated and actual monthlyenergy use; (3) using programmed logic to select which parameter to tune first based on bias pattern,weather and input parameter interactions; and (4) automatically tuning the calibration parametersand checking the progress using pattern-fit criteria. The automated calibration algorithm was implementedin the Commercial Building Energy Saver, a web-based building energy retrofit analysis toolkit.The proof of success of the methodology was demonstrated using a case study of an office buildinglocated in San Francisco. The case study inputs included the monthly electricity bill, monthly gas bill,original building model and weather data with outputs resulting in a calibrated model that more closelymatched that of the actual building energy use profile. The novelty of the developed calibration methodologylies in linking parameter tuning with the underlying logic associated with bias pattern identification.Although there are some limitations to this approach, the pattern-based automated calibrationmethodology can be universally adopted as an alternative to manual or hierarchical calibrationapproaches.

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