MODELICA VERSUS TRNSYS – A COMPARISON BETWEEN AN EQUATION-BASED AND A PROCEDURAL MODELING LANGUAGE FOR BUILDING ENERGY SIMULATION
M Wetter, C Haugstetter
We present the implementation of a multizone building energy simulation model in the equation- basedmodeling languageModelica and compare it to an implementation with comparable modeling detail in TRNSYS. Our development time comparison in- dicates a five to ten times faster development through use of the equation-based modeling language Modelica. The development time for TRNSYS was extrapolated using data from BuildOpt and comparison betwee nBuildOpt and TRNSYS since TRNSYS data were not available. We provide a comparativemodel validation of theModelica and TRNSYS implemen- tation, and compare their numerical performance. The difference in predicted annual heating and cool- ing energy usage between our Modelica model and TRNSYS is 5%to 20%,whichwe primarily attribute to our simplified window model. The computation time of the Modelica model was three to four times longer than TRNSYS, but we believe that dismissing equation-based modeling languages as computation- ally inefficient is a premature conclusion.
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