BEopt(TM) Software for Building Energy Optimization: Features and Capabilities

Research output: NRELTechnical Report


BEopt is a computer program designed to find optimal building designs along the path to ZNE. A user selects from predefined options in various categories to specify options to be considered in the optimization. Energy savings are calculated relative to a reference. The reference can be either a user-defined base-case building or a climate-specific Building America Benchmark building automaticallygenerated by BEopt. The user can also review and modify detailed information on all available options in a linked options library spreadsheet. BEopt calls the DOE2 and TRNSYS simulation engines and uses a sequential search technique to automate the process of identifying optimal building designs along the path to ZNE. BEopt finds these optimal and near-optimal designs based on discrete buildingoptions reflecting realistic construction options. BEopt handles special situations with positive or negative interactions between options in different categories. The BEopt software includes a results browser that allows the user to navigate among different design points and retrieve detailed results regarding energy end-use and option costs in different categories. Multiple cases, based on aselected parameter such as climate, can be included in a BEopt project file for comparative purposes.
Original languageAmerican English
Number of pages21
StatePublished - 2006

NREL Publication Number

  • NREL/TP-550-39929


  • BEopt building energy optimization software
  • Building America
  • building energy optimization
  • building energy simulation software
  • building energy use modeling
  • U.S. Department of Energy


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