Dear All,
Regarding the mandatory requirements of ASHRAE 90.1 for automatic daylighting control.
Our project is a hotel and bedrooms have large windows, so the primary sidelighted area of each room is above 250 ft2. Considering this is a hotel, and that the this type of control in the bedrooms (daylight control, ON/OFF or dimming) may cause some discomfort to the clients, do the daylight control requirements apply?
And in the case that the room has only 1 fixture in the ceiling?
Please note that for all other areas (offices, reception, etc) daylight control will be installed.
Thanks in advance
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5867 thumbs up
May 8, 2020 - 3:38 pm
I don't see any exception for this situation.
Keith Robertson
PresidentSolterre Inc.
53 thumbs up
May 8, 2020 - 5:18 pm
It's hard to imagine that a hotel bedroom has a primary sidelighted area of more than 250 sf. That would be a 21 foot wide window with a 10 foot head height. Is that really the case?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5867 thumbs up
May 8, 2020 - 5:37 pm
I think that the 250 sf is the area of the enclosed space that contains the window(s), not the window area itself.
Francesco Passerini
3 thumbs up
May 11, 2020 - 4:02 am
See definition of primary sidelighted area at p. 13 of ASHRAE 90.1-2010.
Ricardo Sá
Director of SustainabilityEdifícios Saudáveis Consultores (503 910 767)
84 thumbs up
May 11, 2020 - 6:58 am
Thank you, Marcus!
Windows may have 13 foot head height in some cases.