The Bullitt Center Experience: Modeling and Measuring Net Zero Energy

This paper discusses energy use in the Bullitt Center, a 50,000 sf 6-story office building in Seattle, WA designed to achieve net-zero energy performance. The paper will discuss design phase energy modeling, actual metered energy use, and provide comparisons between the modeled and actual data. Actual data is from the first year of energy metering, beginning January 2014. The data set is a partial year, likely January through October 2014, and will represent the building’s early performance during a “tuning” period of the building’s systems. A comparison between the modeled and metered data is presented for the building. Differences between the data sets are explored in the paper and an analysis of potential causes of divergence will be discussed. The focus of the discussion is in what the divergence suggests about modifying the buildings control strategies.

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