Pilot-Credits EQpc128: Daylight for Nordic Projects 1-3 points

Credit language

Intent

This pilot ACP has been closed and is now a Regional ACP.

To connect building occupants with the outdoors, reinforce circadian rhythms, and reduce the use of electrical lighting by introducing daylight into the space.

Requirements

**applicable to LEED v4 and v4.1, BD+C and ID+C rating systems, pilot ACP for EQ credit Daylight

This is a pilot alternative compliance path to BD+C v4 EQc Daylight BD+C v4.1 EQc Daylight, ID+C v4 EQc Daylight and ID+C v4.1 EQc Daylight

Project must be located in a latitude of 55°N or above. (Projects located below 55°N, interested in using this pilot including those in the southern hemisphere may contact USGBC)

Perform annual computer simulations for spatial daylight autonomy 300/50% (sDA_300/50%) and spatial daylight autonomy 100/50% (sDA_100/50%) as defined in the European standard CEN 17037:2018 for each regularly occupied space. Healthcare projects must use each regularly occupied space located in the perimeter area determined under EQ Credit Quality Views. Additionally, calculate the average sDA values for the total regularly occupied floor area.

AND

Design the building to minimize glare and excessive daylight, considering both high and low sun angles. Meet one of the following:

• Provide automated dynamic facade systems. If using this option, the system must be included in the sDA calculations.
• Evaluate the regularly occupied spaces for annual daylight glare probability (DGP) as described in CEN 17037:2018. For minimum glare protection, target to not exceed 0.45 DGP for more than 5% of the occupation time of the space. Provide glare control devices for each regularly occupied space. For any regularly occupied spaces with DGP greater than 0.45 for more than 5% of the occupation time, identify how the space is designed to address glare.
• Perform annual computer simulations for spatial daylight autonomy 3000/50% (sDA_3000/50%) for each regularly occupied space. For minimum glare protection, each regularly occupied space must achieve sDA_3000/50% of 0. Provide glare control devices for each regularly occupied space. Note that this approach is only available for this pilot for simplification purposes and should not be considered as a substitution of ASE. 3000 lux is very high illuminance threshold and occupants should never experience it for more than 50% of their time throughout a year. ASE is a more accurate metric than sDA to evaluate daylight excessiveness in buildings.
• Perform annual computer simulations for annual sunlight exposure 1000,250 (ASE _1000,250) as defined in IES LM-83-12. For minimum glare protection, target ASE _1000,250 of 10% or less. Provide glare control devices for each regularly occupied space. For any regularly occupied spaces with ASE1000,250 greater than 10%, identify how the space is designed to address glare.

Points are awarded according to Table 1. Table 1. Points

	New Construction, Core and Shell, Schools, Retail, Data Centers, Warehouses and Distribution Centers, Hospitality	Healthcare
The average sDA300/50% value for the regularly occupied floor area is at least 40% AND The average sDA100/50% value for the regularly occupied floor area is at least 80%	1 point	1 point
The average sDA300/50% value for the regularly occupied floor area is at least 55% AND The average sDA100/50% value for the regularly occupied floor area is at least 95%	2 points	2 points
The average sDA300/50% value for the regularly occupied floor area is at least 75% AND The average sDA100/50% value for the regularly occupied floor area is at least 95%	3 points	Exemplary performance
Each regularly occupied space achieves sDA 300/50% value of at least 50% AND Each regularly occupied space achieves sDA100/50% value of at least 95%	Exemplary performance or 1 additional point if only 1 or 2 points achieved above.	Exemplary performance or 1 additional point if only 1 point achieved above.

The sDA calculation grids should be no more than 1-foot (300 millimeters) square and laid out across the regularly occupied area at a work plane height of 33.5 inches (850 millimeters) above finished floor (unless otherwise defined). The area of the grid points, within a space, should exclude a band of 19.5 inches (0.5 m) from the walls (unless otherwise specified). Use an hourly time-step analysis based on typical meteorological year data, or an equivalent, for the nearest available weather station. Include any permanent interior obstructions. Moveable furniture and partitions may be excluded.

The DGP should be calculated where the person is likely to be positioned in the space, or if multiple positions are possible, the expected worst case position, at eye height of 47.2 inches (1200 millimeters) above finished floor (unless otherwise defined) in the primary viewing direction from that position. Include shading in the analysis. Only use DGP where it is expected that the vertical illuminance is a good indicator for the glare perception.

Submittals

General

• Participate in the LEEDuser pilot credit forum
• Complete the feedback survey:

Feedback Survey

Credit Specific

• Floor plans highlighting regularly occupied spaces
• List of compliant spaces with their annual summary values for sDA_100/50% and resulting average sDA_100/50% value for the total regularly occupied floor area.
• List of compliant spaces with their annual summary values for sDA_300/50% and resulting average sDA_300/50% value for the total regularly occupied floor area.
• Geometric plots from simulations
• Narrative or output file describing daylight simulation program, simulation inputs, and weather file
• Description of design approach to minimize glare and excessive daylight including confirmation with one of the following options selected (1) automated dynamic façade systems, (2) annual daylight glare probability (DGP), (3) sDA_3000/50%, (4) annual sunlight exposure (ASE _1000,250)
• Results of design approach to minimize glare, including calculation details (for all options except dynamic façade systems) and (as applicable):
  • Automated dynamic façade systems: description of the system(s)
  • annual daylight glare probability (DGP): list of regularly occupied spaces and resulting DGP values. For spaces with values exceeding 0.45 more than 5%, explanation of how the space is designed to address glare.
  • sDA_3000/50%: List of compliant spaces with their annual summary values for sDA_3000/50%
  • Annual sunlight exposure (ASE _1000,250): List of regularly occupied spaces with their annual summary values for ASE _1000,250 . For spaces with values exceeding 10%, explanation of how the space is designed to address glare.

Questions for Pilot Credit Survey

• What challenges did the Pilot ACP help you to address in pursuing the LEED credit for daylighting (e.g. geographical location, daylight vs operating hours etc)?
• Which simulation compliance paths did you attempt under the existing LEEDv4/v4.1 methodology, and what were your results?
• What were your results using this Pilot ACP? Please share the project’s average sDA_300/50% and sDA_100/50% figures, as well as room-based figures if pursuing exemplary performance.
• For glare mitigation, which design strategy did you select? (automated shading, DGP, ASE, SDA) and why.
• What were the results of your glare mitigation analysis? Were you able to achieve the target threshold for all regularly occupied spaces? Why/why not?
• Were there any space types or programmatic functions in the project that any or all of the requirements were not appropriate for?
• What strategies were used to resolve glare issues (automated shading etc)?
• Were there aspects of the CEN standard that were difficult to implement?
• Was daylighting a priority on the project? Why was it a priority (e.g. occupancy-specific priority (school/ healthcare), project pursuing a high level of LEED certification etc).
• Did the availability of this pilot ACP help to promote daylighting on your project?
• At what latitude is the project located?
• Would you recommend any revisions to the Pilot ACP (e.g. make available at lower latitudes, revise requirements for glare control etc)?

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