Requirement that air-cooled DX cooling units with economizers have a monitoring system to determine that the air economizer is working properly.Īppendix G now can be used as a path for compliance with the standard.Ĭhanges to elevator, motor, and refrigeration baselines changes to the baseline for existing building projects and changes to specific opaque assemblies for the baseline envelope model. Requirements are introduced for designs to include both use category and efficiency class. Large, electrically driven chilled-water plants are now required to be monitored for electric energy use and efficiency.ĭedicated outdoor air systems now include both efficiency and rating requirements for compliance. Modified requirements for lighting control to add additional controls in some space types and options to others to allow easier application of advanced controls. Modified requirements for exterior and interior lighting power densities to reflect new lighting levels in the IES Lighting Handbook. Improved clarity on defining exterior walls, building orientation, fault assumptions for the effective R-value of air spaces, and calculation procedures for insulating metal building walls. Increased stringency requirements for metal building roofs and walls, fenestration, and opaque doors.
Changes in ashrae 90.1 2016 verification#
Two new climate zones (0A/B) have been added to all prescriptive requirements tables.Įnvelope verification in support of reduced air infiltration and increased requirements for air leakage of overhead coiling doors. Section 5.1.4 now cites ASHRAE Standard 169 as the source for climatic data, and Annex 1 contains extracts of tables and figures from that standard for the reader’s convenience. It also includes the following:įormat changes to improve usability and readability:Įxceptions separated, indented, and set apart with a smaller font sizeĬhanges to table formats to provide contrast between rowsĪ new Reference Standard Reproduction Annex 1 is provided at the end of the document. This 2016 edition comprises numerous energy-saving measures and incorporates changes from more than 125 addenda. It is an indispensable reference for engineers and other professionals involved in design of buildings and building systems. 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. This standard provides the minimum requirements for energy-efficient design of most buildings, except low-rise residential buildings.
Changes in ashrae 90.1 2016 full#
Many thanks go out to the members of the Energy Cost Budget subcommittee from it's chair as well as to the members of the full 90.1 committee, ASHRAE staff, the approval committees, and to all the commenters that provided feedback.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. Modeling rule changes were also made to heat pump auxiliary heat, economizer shutoff, lighting controls, humidification systems, cooling towers, and the simulation of preheat coils.
This new version of Appendix G can show compliance with the 2016 version of the standard in the following manner:
Previously Appendix G was used only to rate “beyond code” performance of buildings. Appendix G now can be used as a path for compliance with the standard.
It has lots of major changes across the entire standard but every energy modeler should take note of the significant changes to Appendix G, summarized in the press release as:
Here is the press release and here is the page to purchase a copy. The latest version of ANSI/ASHRAE/IES Standard 90.1 is now available on the ASHRAE web site.
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