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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.

Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)
Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)
5th Edition
ISBN:9781305084766
Author:Saeed Moaveni
Publisher:Saeed Moaveni
Chapter12: Electric Current And Related Variables In Engineering
Section: Chapter Questions
Problem 30P
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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: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
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
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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