ASHRAE-90.1-2022- - Page 194
Extracted Content
| Table 11.5.2.5.4 Added Daylighting Parameters | Col2 | Col3 |
|---|---|---|
| Building Use Type | DLA****typ | DLA****max |
| Small office ≤5000 ft2 | 10% | 20% |
| Office >5000 ft2 | 21% | 31% |
| Single-floor retail ≤3000 ft2 or retail with ≤1000 ft2 roof area | 0% | 20% |
| Retail >3000 ft2 of single-floor area | 60% | 80% |
| School | 42% | 52% |
| Warehouse and semiheated | 50% | 70% |
| Medical, hotel, multifamily, dormitory, and other | NA | NA |
b. For spaces with multiple control zones or automatic partial OFF control, automatic full shutoff shall
occur within 15 minutes of all occupants leaving the space . c. For spaces with one control zone, automatic full OFF control shall be used. d. All areas of the project with automatic partial OFF or automatic full OFF control shall have one control
device for every 600 ft [2] of gross lighted area .
Where this credit is taken, additional interior lighting power allowance in Section 9.5.2.3 related to occupancy sensor control shall not be used.
Exception to 11.5.2.5.3: Exception to automatic full OFF control requirement: stairwells.
11.5.2.5.4 L04: Increased Daylighting Control Area. To achieve this credit, the total daylight area of the project (DLA bldg ) with continuous daylight dimming meeting the requirements of Section 9.4.1.1(e) or 9.4.1.1(f) shall be at least 5% greater than the typical daylit area (DLA typ ). Where the actual daylight area includes additional daylit areas beyond the primary sidelighted areas, secondary sidelighted areas, daylight area under skylights, or daylight area under roof monitor, both of the following shall apply:
a. An analysis based on IES LM83 shall be submitted demonstrating that the spatial daylight autonomy is
at least 200, 60% for the additional actual daylight area . b. Additional daylit areas shall be separately controlled by automatic daylighting controls.
Credits shall be determined based on the following:
EC L04 _ adj = EC L04 _ base 20 DLA-------------------GLFA bldg - - DLA typ
where EC L04_adj = energy credits achieved for increased daylighting control area EC L04_base = L04 base energy credit from Section 11.5.3 DLA bldg = lesser of actual daylight area of the project with continuous daylight dimming, ft [2], and (GLFA
× DLA max ); see Table 11.5.2.5.4 GLFA = project gross lighted floor area, ft [2]
DLA typ = typical % of building area with daylight control (as a fraction) from Table 11.5.2.5.4 or 0
where nonretail buildings use Section 9.3 Informative Note: In IES LM83, “spatial daylight autonomy” (sDA) means the amount of daylight received in a space over a portion of operating hours each year. It is written as sDA#,YY% where the indicates the desired lux provided by the daylight. YY% indicates the portion of operating hours per year to receive that daylight. It also includes an area requirement or statement. For example, “sDA200,60% for 30% of regularly occupied spaces” means that 30% of regularly occupied spaces receive at least 200 lux for at least 60% of the operating hours each year.
11.5.2.5.5 L05: Lighting Control for Multifamily Buildings
a. Common-area restrooms, laundry rooms, storage rooms, utility rooms, and garages shall have automatic
full OFF control in accordance with Section 9.4.1.1(h). b. Stairwells, lobbies, and corridors shall have automatic partial OFF in accordance with Section 9.4.1.1(g)
controls that shall reduce general lighting power in the space by at least 66% of full lighting power within 15 minutes of all occupants leaving the space .
192 ANSI/ASHRAE/IES Standard 90.1-2022 (I-P)