The Real-Life Impact of Energy Standards

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Ten Researchers from Pacific Northwest National Laboratory evaluated the energy and environmental impact of ANSI/ASHRAE/IES Standard 90.1-2019.

Here's what they found.

On April 21, 2021, the United States Department of Energy (DOE) issued a preliminary determination that ANSI/ASHRAE/IES Standard 90.1-2019 will achieve greater energy efficiency in buildings subject to the code.

DOE conducted a technical analysis in support of its determination. This analysis assesses Standard 90.1 compared to the previous edition and estimates the anticipated energy consumption of buildings required to meet the updated Standard.

DOE estimates national savings in commercial buildings of approximately:

4.7 percent site energy savings
4.3 percent source energy savings
4.3 percent energy cost savings
4.2 percent carbon emissions

The report reviews many technologies relating to Building Envelope, HVAC, Service Water Heating, Power and Lighting.

Here are some of the most notable lighting-related takeaways:

Addendum	Code Sections	Description of Change	Impact on Energy Use	Included in Quantitative Analysis	Discussion
k	3.2, 6.4.3.3.5, 9.4.1.3	Revises definition of "networked guest room control system" and aligns HVAC and lighting time-out periods for guest rooms.	Decreases Energy Use	Yes	Reduces timeout period from 30 to 20 minutes to activate occupancy-based temperature and ventilation setback controls for guestrooms.
t	9.4.2	Expands the exterior lighting power density (LPD) application table to cover additional exterior spaces that are not in the exterior LPD table.	Decreases Energy Use	No	Reduces lighting energy. Excluded from quantitative analysis because the exterior areas added to the table are not modeled in the prototypes.
bb	Table 9.6.1	Changes interior LPD requirements for many space types.	Decreases Energy Use	Yes	Reduces lighting energy with lower LPD.
cg	Table 9.5.1	Revises LPDs using the Building Area Method.	Decreases Energy Use	Yes	Reduces lighting energy with lower LPD.
cv	9.4.1.2	Updates the lighting control requirements for parking garages in Section 9.4.1.2.	Decreases Energy Use	No	Reduces lighting energy. Excluded from quantitative analysis because the parking garages are not modeled in the prototypes.
cw	9.4.1.1, Table 9.6.3	Changes the daylight responsive requirements from continuous dimming or stepped control to continuous dimming required for all spaces and adds a definition of continuous dimming.	Decreases Energy Use		Reduces lighting energy because of more stringent daylighting control requirements.

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The Report was Prepared for: U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Building Technologies Office: Energy.gov/eere/buildings

By:
Jian Zhang
Michael Rosenberg
Jeromy Lerond
Yulong Xie
Chitra Nambia
Yan Chen
Reid Hart
Mark Halverson
Douglas Maddox
Supriya Goel
Pacific Northwest National Laboratory