Skip to main content

Calculating daylight

The daylight factor method (CIE - E.U.) calculates how much daylight reaches any location in a room assuming overcast/diffuse conditions; and can account for corner windows, which cannot be accounted for using the lumen method (IES - U.S.). When 2,200 fc is measured on the ground outside, what is the resulting illumination level if one end of a room has a daylight factor of 2?



Answer is 2200 fc x 0.02 = 44 fc. DF is a percentage of the light available outside.
are-review.blogspot.com

Comments

Post a Comment

Try These Too!

Interior Glazing

Safety glazing (tempered glass, laminated glass or impact resistant plastic) is not required at this interior window (18sf glazed area). Which of these satisfies conditions for using non-safety glazing? A. Within 36 inches horizontally of a walking surface B. Bottom edge is less than 60" above the plane of the adjacent walking surface C. 1 1/2 in protective bar between 34 and 38 inches on accessible side D. Exposed area of the pane is greater than 9 sf Answer C. 1 1/2 inch protective bar between 34-38 inches on accessible side. In this case, safety glazing is not required. ARE 4.0 exam prep: BDCS
Post a Comment
See the answer »

Truss types

Like the diagonal web members in a Pratt truss, the vertical web members in a Howe truss are in: A. tension B. compression Answer A. tension
Post a Comment
See the answer »

Heat gain calculation

Which lighting produces a 654.72 Btu/hr heat gain? A. 4x 40 watt fluorescent bulbs B. 2 x 75 watt incandescent C. 12 x 12 watt LEDs Answer (1 watt = 3.41 Btu/hr) A. 4x40 watts x 1.2 (for ballast) x 3.41 Btu/hr ARE 4.0 exam prep: BS
Post a Comment
See the answer »