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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 \cite{crawley_energyplus:_2001}, has been designed to asses assess  energy performance of conventional building systems and whole buildings but 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.}  
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