ASHRAE标准209描述了将建筑能源建模应用于设计的方法。该标准旨在定义可靠且一致的程序，以促进及时能源建模的使用，从而量化设计决策在制定时的影响。

ASHRAE Standard 209 describes a methodology to apply building energy modeling to the design. The standard was created to define reliable and consistent procedures that advance the use of timely energy modeling to quantify the impact of design decisions at the point in time at which they are being made.