cee496-problemset1-spring2005

cee496-problemset1-spring2005 - CEE496 — ELECTRICAL...

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Unformatted text preview: CEE496 — ELECTRICAL BUILDING SYSTEMS LIGHTING CALCULATIONS February 1, 2005 PROBLEM SET #1 Point—by-Point Method 1. Calculate the initial illuminance values at points A and B on the section drawing below. Use the candela values on the cut sheet for the adjustable, low voltage, quartz downlight, the bottom set of data and 30 degree tilt. Hint: Remember, you are only interested in the luminous intensity perpendicular to the plane of the calculation point. Can ﬂoor) ‘12 (Man! it) 2. Calculate the maintained illuminance values at points A and B on the layout below. Use the candela values on the cut sheet for the compact ﬂuorescent downlight, the top set of data. Use a light loss factor (LLF) of 0.85. Hint: Remember, that illuminance adds and that you are only interested in the luminous intensity from each source perpendicular to the calculation point. 3. Using the CU table from the cut sheet for the ﬂuorescent parabolic troﬂ'er and the criteria below, ' calculate the following: Workplane height — 30”, (24) 3-1amp light ﬁxtures with 2900 lumens per lamp, ceiling reﬂectance — 70%, wall reﬂectance — 50%, ﬂoor reﬂectance — 20%, ballast factor — 0.9, lamp lumen depreciation factor — 0.9, luminaire dirt depreciation factor — 0.95, room dimensions ~ 50’ x 35’, ceiling height — 9’ UOW? Calculate the Room Cavity Ratio (RCR). Determine the Coefﬁcient of Utilization (CU). Calculate the Light Loss Factor (LLF). Calculate the average maintained illuminance at the workplane. 4. Using the same photometric data from problem 3, and the criteria below, calculate the following: Workplane height — 30”, ceiling reﬂectance — 70%, wall reﬂectance — 50%, ﬂoor reﬂectance ~ 20%, ballast factor — l.l5, lamp lumen depreciation factor — 0.9, luminaire dirt depreciation factor — 0.9, room dimensions — 60’ x 40’, ceiling height — 12’, luminaire suspension distance — 36” wwwowa Q Calculate the Ceiling Cavity Ratio (CCR). Determine the effective ceiling cavity reﬂectance using Table 8—6. Calculate the Room Cavity Ratio (RCR). Determine the Coefﬁcient of Utilization (CU). Calculate the Light Loss Factor (LLF). For a required maintained average illuminance of 50 footcandles at the workplane, how many 3—lamp luminaires are needed, with 2900 lumens per lamp. Using the number of luminaires calculated in part F, layout the luminaires within the space for a uniform level of illumination. :5on 8:38.? «mum ....|'||I.l . .vllll‘lllxlll N000M00. 3. N. 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