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\subsection{Limitations of Current Methods}  In parallel, current energy modeling tools lack the fidelity and adaptability necessary to validate the multi-functional benefits of next-generation envelope technologies \cite{wetter2011view}.   %\footnote{Wetter, Michael. A View of Future Building System Modeling and Simulation. In Building Performance Simulation for Design and Operation. Abingdon, Oxon; New York, NY: Spon Press, 2011.}   For example, EnergyPlus, a common practice building energy modeling (BEM) tool, has been designed to asses energy performance of conventional building systems and whole buildings but lack produces significant inaccuracies in the thermal and airflow behavior of a double skin facade when compared to measurements \cite{kim2011difficulties}.   %lack  the fidelity necessary to simulate the mass, momentum, and energy of future multifunctional building systems \cite{kim2011difficulties}. %multi-functional convection and radiation effect of new strategies as they relate to established building physics models \cite{kim2011difficulties}.  %\footnote{Kim, D.-W. and Park, C.-S. \textit{Difficulties and limitations in performance simulation of a double skin facade with EnergyPlus. Energy and Buildings 43,} 12 (2011), 3635-3645.}   In practice, this leads to models that are often created separately from BEM and then loosely connected through pre- or post-processing of data. 
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