标准90.1是美国商业建筑能源规范的基准，也是世界各地规范和标准的关键基础，已有35多年。本标准规定了除低层住宅建筑外的大多数建筑节能设计的最低要求。它详细提供了新建筑及其系统、建筑及其系统的新部分、现有建筑中的新系统和设备的设计和施工的最低能效要求，以及确定是否符合这些要求的标准。 对于参与建筑和建筑系统设计的工程师和其他专业人员来说，它是一个不可或缺的参考。2019版包括各种修改和澄清，以提高内部一致性，并使文件的结构和语言标准化。要求的重大变更包括以下管理和实施新的调试要求，符合ASHRAE/IES标准2021建筑围护结构垂直开窗的“非金属框架”和“金属框架”产品的组合类别所有气候区的SHGC和U系数最低标准修订空气泄漏部分，以澄清合规性规定了与前厅相关的例外情况，增加了使用空气遮断的新选项和相关标准，减少了空间照明功率容差- 通过空间法和建筑面积法，为25000平方英尺（2300平方米）以下翻新办公楼和零售楼的承包商和设计师提供照明的新简化方法。更新了停车场的照明控制要求，以考虑LED支持的日光响应要求的使用，根据NEMA LSD-64-2014，增加了“连续调光”的定义，明确了侧照明要求和相关例外机械新要求，允许在IT设备负载大于10千瓦的计算机室内使用ASHRAE标准90.4而非ASHRAE标准90.1，新设备效率要求表和对现有表的更改首次将风扇效率等级（FEG）效率指标替换为风扇能量指数（FEI）报告吊扇功率的新要求和风扇电机选择的更新要求，以增加负载的设计选项- 匹配变速风扇应用高层住宅建筑的新能源回收要求急症护理住院患者冷凝器热回收的新要求住院能源成本预算（ECB）方法（第11节）为确保现场发电系统的连续性而进行的大量更改性能评级法（附录G）澄清了附录G规则和当将多个热区组合成单个热区时，相应的基准效率要求新的明确加热和冷却COP（无风扇）用于基准成套冷却设备建模自动插座控制影响的新规则设置更具体的渗透建模基准规则阐明了工厂和盘管尺寸应如何进行更新的建筑性能因素合规路径更清晰，处理可再生能源的更具体规则照明建模规则的新更新

Standard 90.1 has been a benchmark for commercial building energy codes in the United States and a key basis for codes and standards around the world for more than 35 years. This standard provides the minimum requirements for energy-efficient design of most buildings, except low-rise residential buildings. It offers, in detail, the minimum energy efficiency requirements for design and construction of new buildings and their systems, new portions of buildings and their systems, and new systems and equipment in existing buildings, as well as criteria for determining compliance with these requirements. It is an indispensable reference for engineers and other professionals involved in design of buildings and building systems.The 2019 edition includes various modifications and clarifications to improve internal consistency and to standardize the structure and language of the document.Significant changes to requirements include the following:Administration and EnforcementNew commissioning requirements in accordance with ASHRAE/IES Standard 202Building EnvelopeCombined categories of "nonmetal framed" and "metal framed" products for vertical fenestrationUpgraded minimum criteria for SHGC and U-factor across all climate zonesRevised air leakage section to clarify complianceRefined exceptions related to vestibules, added new option and associated criteria for using air curtainsLightingModified lighting power allowances for Space-by-Space Method and the Building Area MethodNew simplified method for lighting for contractors and designers of renovated office buildings and retail buildings up to 25,000 ft2(2300 m2)Updated lighting control requirements for parking garages to account for the use of LEDsUpdated daylight responsive requirements, added definition for "continuous dimming" based on NEMA LSD-64-2014Clarified side-lighting requirements and associated exceptionsMechanicalNew requirements to allow the option of using ASHRAE Standard 90.4 instead of ASHRAE Standard 90.1 in computer rooms that have an IT equipment load larger than 10 kWAdded pump definitions, requirements, and efficiency tables to the standard for the first timeNew equipment efficiency requirement tables and changes to existing tablesReplaced fan efficiency grade (FEG) efficiency metric with fan energy index (FEI)New requirements for reporting fan power for ceiling fans and updated requirements for fan motor selections to increase design options for load-matching variable-speed fan applicationsNew energy recovery requirements for high-rise residential buildingNew requirement for condenser heat recovery for acute care inpatient hospitalsEnergy Cost Budget (ECB) Method (Section 11)Numerous changes to ensure continuitySet baseline for on-site electricity generation systemsPerformance Rating Method (Appendix G)Clarified Appendix G rules and corresponding baseline efficiency requirement when combining multiple thermal zones into a single thermal blockNew explicit heating and cooling COPs without fan for baseline packaged cooling equipmentNew rules for modeling impact of automatic receptacle controlsSet more specific baseline rules for infiltration modelingClarified how plant and coil sizing should be performedUpdated building performance factorsBoth Compliance PathsClearer, more specific rules for treatment of renewablesNew updates to rules for lighting modeling