B2. An office, 12m x 5m x 3.5m (W×L×H) in dimension using 600mm x 600mm ceiling tiles, is to be illuminated by 4 × 36W 1200 luminaires, mounted at ceiling. The required lighting level is 500 lux. Assuming the working plane is at 0.8m AFFL. Maintenance factor is 0.8 and the ratio of reflectances at ceiling, wall and floor are 0.7, 0.5 and 0.2. Each 36W lamp gives a light output of 3000 lm. (Note: AFFL is Above Finished Floor Level) Light Output Ratio Up 0.45 Max. Spacing to Height Ratio Down 0.35 SHR MAX 1.79 Total 0.80 SHR MAX TR 2.20 Utilization Factors UF (F) SHR NOM = 1.75 Reflectances Room Index C W F 0.70 0.50 0.20 0.30 0.29 0.10 0.25 0.50 0.50 0.20 0.29 0.34 0.38 0.41 0.45 0.30 0.24 0.30 0.34 0.37 0.42 0.10 0.21 0.27 0.31 0.34 0.30 0.50 0.20 0.24 0.28 0.31 0.34 0.75 1.00 1.25 1.50 2.00 2.50 3.00 4.00 5.00 0.34 0.41 0.46 0.50 0.55 0.58 0.61 0.64 0.66 0.35 0.40 0.44 0.50 0.54 0.57 0.61 0.63 0.31 0.36 0.40 0.46 0.50 0.53 0.58 0.61 0.48 0.50 0.45 0.47 0.50 0.53 0.39 0.42 0.45 0.48 0.51 0.40 0.53 0.55 0.37 0.39 0.43 0.44 0.30 0.10 0.20 0.25 0.28 0.31 0.34 0.37 0.38 0.41 0.42 0.18 0.23 0.26 0.28 0.32 0.35 0.37 0.39 0.41 0.00 0.00 0.00 0.12 0.16 0.18 0.19 0.22 0.23 0.25 0.26 0.28

B2. An office, 12m x 5m x 3.5m (W×L×H) in dimension using 600mm x 600mm ceiling tiles, is to be illuminated by 4 × 36W 1200 luminaires, mounted at ceiling. The required lighting level is 500 lux. Assuming the working plane is at 0.8m AFFL. Maintenance factor is 0.8 and the ratio of reflectances at ceiling, wall and floor are 0.7, 0.5 and 0.2. Each 36W lamp gives a light output of 3000 lm. (Note: AFFL is Above Finished Floor Level) Light Output Ratio Up 0.45 Max. Spacing to Height Ratio Down 0.35 SHR MAX 1.79 Total 0.80 SHR MAX TR 2.20 Utilization Factors UF (F) SHR NOM = 1.75 Reflectances Room Index C W F 0.70 0.50 0.20 0.30 0.29 0.10 0.25 0.50 0.50 0.20 0.29 0.34 0.38 0.41 0.45 0.30 0.24 0.30 0.34 0.37 0.42 0.10 0.21 0.27 0.31 0.34 0.30 0.50 0.20 0.24 0.28 0.31 0.34 0.75 1.00 1.25 1.50 2.00 2.50 3.00 4.00 5.00 0.34 0.41 0.46 0.50 0.55 0.58 0.61 0.64 0.66 0.35 0.40 0.44 0.50 0.54 0.57 0.61 0.63 0.31 0.36 0.40 0.46 0.50 0.53 0.58 0.61 0.48 0.50 0.45 0.47 0.50 0.53 0.39 0.42 0.45 0.48 0.51 0.40 0.53 0.55 0.37 0.39 0.43 0.44 0.30 0.10 0.20 0.25 0.28 0.31 0.34 0.37 0.38 0.41 0.42 0.18 0.23 0.26 0.28 0.32 0.35 0.37 0.39 0.41 0.00 0.00 0.00 0.12 0.16 0.18 0.19 0.22 0.23 0.25 0.26 0.28

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter17: Commercial And Industrial Air-conditioning Control Systems

Section: Chapter Questions

Problem 6RQ

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