A Tale of Two Campuses: Energy Use Metering and Estimation

Caleb Rockenbaugh, PE, LEED-AP, NREL

Working on the energy efficiency assessment of two campuses for a federal agency totaling nearly 4 million square feet, provided both the opportunity to estimate facility energy use for a campus with limited site metering and to compare the methodology with a fully metered campus. Using a combination of the Commercial Buildings Energy Consumption Survey (CBECS) and Labs21 Benchmarking Data in conjunction with total campus energy use and building space type square footage, a tool was developed that provides what may be considered a rough estimation of facility energy use, including typical energy end-use components. The presentation provides an overview of metering requirements of the Energy Independence and Security Act of 2007 (ESIA 2007) and other Federal mandates. While the tool provides a methodology for estimating facility energy use where metered data isn't available, it also highlights the importance of implementing a metering plan for multi-facility and campus settings.


Mr. Rockenbaugh is an Engineer at the National Renewable Energy Laboratory (NREL). Prior to joining NREL, Caleb has worked in the design and construction of high performance buildings with a focus on whole building energy simulation. His experience includes net zero energy residential buildings, high performance schools, as well as data center and lab facilities where he has worked to minimize energy use and to incorporate and maximize renewable energy technologies. Caleb is a Registered Professional Engineer, a LEED® Accredited Professional, and a member ASHRAE, ASES, and the Colorado Renewable Energy Society. He holds a Bachelor of Science in Mechanical Engineering from Wright State University.


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