Question 2 (50%) A general lighting system to be designed for a general office is designed with requirements as shown be

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Question 2 50 A General Lighting System To Be Designed For A General Office Is Designed With Requirements As Shown Be 1 (29.36 KiB) Viewed 27 times

Question 2 (50%) A general lighting system to be designed for a general office is designed with requirements as shown below: • Length = 25m, Width = 15m, Height - 3.5m Ceiling to desk height is 2.5m • Room reflectance=0.7 ceiling 0.3 wall and 0.2 floor • Area to be illuminated of standard illuminance level using twin lamp 70W CFL Luminaire with a SHR of 1.50 Each lamp has an initial output (efficacy) of 90 lm/W Light loss factor is 0.75 C 0.70 0.50 Offices General offices Computerworkstations Conference rooms, executive offices Uition factors (r) 0.30 Computer and date preparation rooms Fling rooms Drawing offices Gener Drawing boards Computeroided design and draing Banks and building societies Counter, office or WF 0.50 0:30 0.30 0.50 0.30 0.10 0.50 0.30 0:30 0.30 Table 1 0.29 034 0.33 637 Standard maintained glare minance index (lux) 500 300-500 500 300 300 0.29 034 0.37 0.27 0.31 0.10 0:00 0.00 0.00 023 026 0.28 500 750 300-500 300 500 300 Limiting 0.38 0.42 0.45 0.49 052 19 19 19 19 19 16 16 19 Rinde, K 075 100 125 1.50 2.00 2.50 041 0.47 0.52 0:35 060 063 066 069 836 042 047 033 038 043 0:37 042 0.33 19 19 SHRNOM-150 5.00 0.71 050 0.56 0.59 062056 047 052 056 0.39 043 0.68 046 046 0.49 053 0.55 0.57 060 060 0.55 0.57 0.59 0.52 0.56 0.58 0.39 0:42 047 0.50 0,48 0.46 0.45 0.50 040 0.49 051 043 0.40 das 0.43 0.53 051 6:30 0.35 0.38 0.41 0.30 033 044 046 04 035 036 038 0.390 Table 2 (a) Determine the standard illuminance level and glare index from Table 1. (b) Determine the Utilisation Factor from Table 2. (c) Determine the number of luminaires needed using Lumen method. (d) Sketch a two dimensional layout of the lighting system in the office. (10%) (10%) (15%) (15%)