Illumination Example 6
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This document provides guidelines and an example problem for designing an illumination layout. It lists assumptions to make, such as depreciation and utilization factors. Then an example hall is given to illuminate, and the process to calculate the number and type of lamps needed is shown. Various lamp wattages and lumen outputs are provided. For the example hall, the calculations select a 300W lamp, with 10 lamps in a 2 row layout meeting the space to height ratio requirements. Homework is assigned to solve the same example for different lamp wattages.
Illumination Example 6
- 1. Illumination Based Problems Vijay Balu Raskar (B.E.Electtrical)
- 2. NOTE:- Before Designing assume following things clearly. Assumptions are required for illumination. Assume Depreciation Factor = 1.2 Assume Maintenance Factor = 0.8 Utilization Factor = 0.6 to 0.9 Assume illumination is free from glare Assume illumination is free from dark shadows Assuming lamps are arranged to give uniform illumination. Reflective index of wall and ceiling is maximum. Selecting a fluorescent tube light Space to height ratio along the length and breadth is less than or equal to 1.5 Assume Height of mounting of Lamp ( as per area) Vijay Balu Raskar (B.E.Electtrical)
- 3. Example -6 • A big hall of (30 m (L) X 12 m (b)) is to be illuminated and illumination required is 50m candles. • Assuming a suitable data and calculated space height ratio, a utilization factor of 0.5, depreciation factor of 1.3, Estimate the no. rating and disposition of lamps.
- 4. Five types of lamps having lumen output as given below, Sr. No Watts Lumens 1 100 1615 2 200 3650 3 300 4700 4 500 9950 5 1000 21500
- 5. Design considerations • Illumination required is = 50 lux. • Depreciation Factor = 1.3 • Let Mounting height be 5m
- 6. Calculation of No. of lamps required • From Table on Lamp Data (Given) We have, AXEXDF 30 X 12 X 50 X 1.3 Gross Lumen Required = 46800 UF 0.5 Number of lamp required, For 100W 46800 29 1615 For 200W 46800 13 3650 For 300W 46800 10 4700 For 500W 46800 5 9950 For1000W 46800 2 21500
- 7. Layout • Taking arrangement as • Let suitable type of lamp will be 300W (take any lamp) i.e. No of lamp = 10 • No. lamps in one row = 5 • No. of rows = 2 • For hall illumination, no black board. • Distance along the length, a = 30/6 = 5m • Distance along the width, b = 12/ 3 = 4 m • DRAW LAYOUT
- 8. S Ratio = Spacing Between Lamps H Height of mounting of Lamp Along Length 5 1 5 S Ratio 1 H Space to height ratio is unity. 4 Along Width 0 .8 5 S Ratio 0 .8 H Space to height ratio is 0.8. Lamps of lower wattage will require more number of fittings and therefore will increases the cost.
- 9. HOME WORK Solved same problem but select different lamp than 300W. Solve for 100W Solve for 200W Solve for 500W Solve for 1000W