Building energy modeling (BEM) is a method of performing analysis of a building's energy use using computer-based simulation software. The software works by formulating a mathematical model that provides a clear representation of the building operation energy. Energy modelers input data to create a building model and the calculation engine like Energy plus or DOE2.2 solves equations based on thermodynamics. A whole-building simulation can take from seconds to hours to run, depending on the level of detail and complexity of the analysis. Results are typically reported on annual performance and include building loads, energy use, energy costs, and other performance-related parameters.
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