Paper Conference

2022 Building Performance Analysis Conference and SimBuild co-organized by ASHRAE and IBPSA-USA


From Plug Loads to Breaker: Sub-metering a Cross Laminated Timber Building to Calibrate an OpenStudio Model

Gabriel Flechas, Paulo Tabares-Velasco, Gabe Fierro

Abstract: Cross laminated timber (CLT) are mass timber plates composed of layered boards arranged crosswise and glued together. They enable faster construction times than traditional building methods by taking advantage of prefabrication. CLT is gaining in popularity for building construction as building designers and stakeholders look for ways to reduce the carbon footprint of construction projects. However, there is little documentation on actual CLT building energy performance over a long period of time. Thus, the objective of this study is to document whole CLT building energy use to serve as a basis for model validation. This study details high fidelity monitoring of a CLT office building. The building is part of a larger study monitoring four CLT buildings in the United States to document CLT building performance and validate CLT building energy models. The CLT office is recording energy use at multiple levels; from whole building energy at the panels down to individual plug loads that will be used to inform and validate an OpenStudio model. Current analysis of the plug load data reveals that office equipment is responsible for 8.4% of the energy consumed in the building and much of it remains active each night. The plug loads make up about 20% of the over all electric load for the 3 months of data collected so far. Early work on calibrating the OS mode has demonstrated the model can only capture general energy behavior well without incorporating plug-load data. Incorporating high fidelity plug load data into the OS model will allow for model calibration at sub-hourly intervals. The CLT building model exhibits lower heating and cooling energy when compared to a model using a steel frame construction which matches trends observed in the literature.
Pages: 396 - 405