Whole-building energy models are used in practice to predict energy and comfort for an entire building given its architectural and built state, external stimuli from weather, and internal behavior of both the equipment and occupants of the building. There exists both open source and commercial software for simulating such cases for an entire year at sub-hourly reporting intervals. Unfortunately, the dynamics of the building are masked in assumptions included in the numerical routines that are often intertwined within the thermal physics. Because of this, control-oriented analysis is limited to performing exhaustive time-based simulations. In this paper, we describe a method to analytically extract the dynamics from a whole-building energy simulator for the purpose of control and dynamical systems analysis. In this way, the function of the energy simulator is only a user interface and a means to organize information inherent in the dynamics (capacitances, interaction between elements of the building, etc.). We provide a test case on a medium office building and illustrate some of its control-oriented dynamic properties using EnergyPlus as the simulator.

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