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Defining the Standard of Care for Energy Modelers: An Overview of ASHRAE Standard 209 (2021)


ASHRAE recognizes that building energy simulation is most useful when it can inform the design process to reduce energy use. ASHRAE Standard 209 “Energy Simulation Aided Design for Buildings” describes a methodology to apply building energy modeling to the design process. The standard was created to advance the timely use of energy modeling to quantify how design decisions can affect building energy use.


Learning Objectives:

Describe the structure of the Standard

Review the specific Modeling Cycles and how they have been used in real projects

Discuss the background of and need for Standard 209

Describe potential use cases and how to comply with the Standard



1 LU | HSW


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