About the portfolio
Building energy modeling (BEM)—physics-based calculation of building energy consumption—is a multi-use tool for building energy efficiency. Established use cases include design of new buildings and deep retrofits, development of whole-building energy efficiency codes and standards (e.g., ASHRAE 90.1) and performance-path compliance with those codes (e.g., ASHRAE 90.1 “Appendix G” Performance Rating Method), beyond-code physical asset rating and labeling (e.g., USGBC’s LEED energy credit), and development of prescriptive design guides (e.g., ASHRAE 50% beyond 90.1 Advanced Design and Retrofit Guides). Emerging uses include design of low-energy building control algorithms, continuous commissioning of building mechanical systems, and dynamic building control for energy optimization or demand response. DOE has been actively involved in BEM research and development since the early 1970s, before its ascension to a cabinet-level department.
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