Determine the coefficient of utilization of an indi- rect distribution luminaire installed in a 50 ft × 60 ft room with a 10 ft ceiling height, 30 in. task plane, and luminaires mounted 2 ft from below the ceiling. The Pec = 80%, Pw = 50%, pe = 20%. Use the CU table.
Determine the coefficient of utilization of an indi- rect distribution luminaire installed in a 50 ft × 60 ft room with a 10 ft ceiling height, 30 in. task plane, and luminaires mounted 2 ft from below the ceiling. The Pec = 80%, Pw = 50%, pe = 20%. Use the CU table.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
Transcribed Image Text:Coefficient of Utilization
Pfe
20
Pce
80
70
50
Pw
50
30
10
50
30
10
50
30
10
RCR
0.83
0.66
0.83
0.83
0.72
0.72
0.72
0.50
0.50
0.50
0.72
0.69
0.62
0.60
0.57
0.43
0.42
0.40
2
0.63
0.58
0.54
0.54
0.50
0.47
0.38
0.35
0.33
0.55
0.49
0.45
0.47
0.43
0.39
0.33
0.30
0.28
0.42
0.37
0.32
0.28
4
0.48
0.43
0.42
0.37
0.32
0.33
0.29
0.26
0.26
0.23
0.36
0.37
0.28
0.23
0.20
6.
0.38
0.32
0.27
0.33
0.24
0.23
0.20
0.17
7
0.34
0.28
0.23
0.30
0.24
0.21
0.21
0.17
0.15
8.
0.31
0.25
0.20
0.27
0.21
0.18
0.19
0.15
0.13
0.18
0.16
0.28
0.22
0.24
0.19
0.16
0.17
0.14
0.11
10
0.25
0.20
0.22
0.17
0.14
0.16
0.12
0.10
Transcribed Image Text:Determine the coefficient of utilization of an indi-
rect distribution luminaire installed in a 50 ft × 60 ft
room with a 10 ft ceiling height, 30 in. task plane,
and luminaires mounted 2 ft from below the ceiling.
The Pec = 80%, pw = 50%, pje = 20%. Use the
CU table.
How many fixtures are required to maintain 50
foot-candles if the fixtures are two-lamp, 3200 lu-
mens per lamp and LLF is 0.8 based on the product
of LLD and LDD?
ation
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