The LEED v4.1 requires area input for which the lux levels are within the range for 9am AND 3pm.
From my understanding of the credit language, it is required to average the 9am values for two days (15 days within 21 September & 21 March). A similar average is required for 3pm.
Since the calculator only provides 1 cell and asks for the area of 9am AND 3pm, does this mean the average of 9am and 3pm should be considered? Would it be more reasonable to input the lowest of the two values to essentially show the 'worst case scenario' is complying with the 300-3000 lux range?
Junaid Mujahid
Junior HVAC Design Engineer - SustainabilityPNC Architects
1 thumbs up
November 20, 2024 - 3:21 am
The LEED v4.1 Daylight Calculator*
Collin Robinson
The Sheward PartnershipNovember 20, 2024 - 10:03 am
It is the worst case area, using the average of the two best-case sky conditions at the equinoxes for 9 am and 3 pm. The way I read the credit language is that the one value you enter is the area that has "illuminance levels ... between 300 lux and 3,000 lux at *both* 9 a.m. and 3 p.m."