A 30 ft by 40 ft classroom with 8 ft high ceilings will
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter11: Thermostats, Pressure Switches, And Other Electric Control Devices
Section: Chapter Questions
Problem 17RQ
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Question
A 30 ft by 40 ft classroom with 8 ft high ceilings will have an ambient lighting target illuminance of
70 fc at a work plane that is 28 inches above the floor. It is anticipated that the ceiling reflectance
is 0.50 and the average wall reflectance is about 0.3. The space will be illuminated with recessed
lay-in 2 ft x 4 ft open parabolic troffer luminaires with three lamps, as shown in Figure 20.16. The
initial output of the fluorescent lamps is 2850 lumen. The light loss factor will be assumed to be
0.70. Neglecting the spacing criteria, determine the minimum number of luminaires required to
provide uniform illumination in the space. (Type in the number only)
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