DIALux Space to Height index for Surface Circular Light Sources. Hengameh Kojooyan Jafari1 - Pouya Delkhosh2. 1 Faculty member of Islamshahr Branch, ...
3rd National and First International Conference in applied research on
Electrical, Mechanical and Mechatronics Engineering
DIALux Space to Height index for Surface Circular Light Sources Hengameh Kojooyan Jafari1 - Pouya Delkhosh2 Faculty member of Islamshahr Branch, Islamic Azad University, Islamshahr, Tehran, Iran. Young Researchers and Elite Club, Islamshahr Branch, Islamic Azad University, Islamshahr, Iran. 2 Islamshahr Branch, Islamic Azad University, Islamshahr, Tehran, Iran. Young Researchers and Elite Club, Islamshahr Branch, Islamic Azad University, Islamshahr, Iran. 1
ABSTRACT As improvement of light sources central space to height index is necessary to create uniform illumination on working plane and this index depends on the number of the luminaries, in this paper improvement of space to height index for limited surface circular light sources with circular arrangement is studied using DIALux 4.12 Software. The results of this study with DIALux 4.12 are the same as those with MATLAB in the literature Keywords: Space to Height index, Illumination, Surface Circular Light Source, DIALux.
1. INTRODUCTION One of the important indices in luminary arrangement in a place, is ratio of space of luminaries to effective height of a place. This parameter depends on uniform illumination on the working plane [1-7]. Previous studies [1-3] on this index illustrate the results for all of light sources by MATLAB 2006 software considering the minimum illumination difference between maximum illumination point and minimum illumination point as symbol of uniform illumination and improved space to height index. This paper follows the similar process using DIALux 4.12 software to compare the results of improved S/H index for surface circular light source of MAZINOOR Iranian manufacturer in DIALux with that of previous study with MATLAB 2006 [1, 2] . In this paper, the typical surface circular light source is “MAZINOOR M103C1E27 +M105G360 -45W TWIST 45W” that its diffuse radiating curve is shown in Fig. 1. The main idea is calculating improved S/H index for limited number of MAZINOOR light sources from 2 to 6. This light source is surface circular source. The results of S/H indices are compared with those of literature [1-3]. 2. Surface Circular Light Sources This study uses a typical surface circular light source from DIALux 4.12. This surface circular light source specifications are according to the Fig.1 and Table 1. of MAZINOOR Iranian Manufacturer. Fig. 1 shows luminous intensity distribution of the typical luminary of MAZINOOR manufacturer.
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Fig.1. MAZINOOR manufacturer diffuse radiating curve 3. Typical Working Plane For space to height calculation, a typical room is selected according to Table 1. In this table the height of room is 2.8[m]; however, the mounted height of luminary is 1[m] then, the effective height is 1.8[m].
Table 1. Typical Room Dimension
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4. Illumination Calculation in DIALux In DIALux 4.12, there are surface calculations and point calculations with three directions of illumination calculating, called free, horizontal and vertical [7]. In this study point calculations with free direction are selected; however, these points are aligned on the floor of the typical room to calculate the minimum and maximum illuminations. These points have small surfaces and their calculating directions are considered similar to luminous flux direction of luminary. Also the luminaries are mounted on circular arrangement of DIALux 4.12.
5. Simulation Results in DIALux After room and calculation points’ place design, DIALux can calculate illuminations at these points. The illumination results are illustrated for different S/H indices and miscellaneous number of luminaries from 2 to 6 according to the Figs. 2 to 6 and Table 2. Difference between Emax and Emin ( E) at S/H index point for 2 to 6 Surface Circular luminaries are less than 0.5 Luxury [1]. DIALux can show results with an accuracy of 1 lux, so DIALux can`t show correct amount of E, then, it shows zero for E at S/H index point for 2 to 6 luminaries according to Table 2. Table 2. Improved S/H indices for MAZINOOR Manufacturer Luminary with E=0 #Luminaries
S/H
2
1.2
3
1.43
4
1.34
5
1.2
6
1.06
Fig. 2 shows that for two luminaries the error increases while space of luminaries is increased. Although in one specific S/H index in Table 2, the error is zero.
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Figs. 3 to 6 show that the error increases while space of luminaries is increased but in one specific S/H index, the error is zero. Also the first peak point is increased with increasing number of luminaries.
6. Discussion According to Figs. 2 to 6 and Table. 2 for typical room of Table. 1 and typical luminary of Fig. 1 with circular arrangement, increasing S/H index from 0 to 3 results increase of the error but in one point the error is decreased to zero according to Table. 2. These improved S/H indices are all near to 1.
7.
Conclusion
As improved S/H indices depend on uniform illumination, calculating illumination and these indices are important subject of luminary design. This paper studies improved S/H index using DIALux 4.12 software for a typical surface circular light source of MAZINOOR Iranian manufacturer and a typical room and point calculation with free direction. The S/H indices results of DIALux study are exactly the same as those of MATLAB 2006 study in the literature [1-3].
8. References [1]
[2] [3]
[4] [5] [6]
Hengameh Kojooyan Jafari, “Improvement of Space to Height index for Surface Circular Light Sources”, International Conference on Development, Energy, Environment, Economics (DEEE), Nov. 30 -Dec. 2, 2010, ISSN: 17926769, ISBN: 9789604742530, PP. 71- 74. Hengameh Kojooyan Jafari, “Improved Space to Height index for Light Sources considering Critical Height”, Scholers’ press, 2014, ISBN: 9783639663556. Hengameh Kojooyan Jafari, “Luminary Scheme Improvement using Suitable Category and Space to Height index, International Conference on Development, Energy, Environment, Economics (DEEE), Nov. 3 - Dec. 2, 2010, ISSN: 17926769, ISBN: 9789604742530, PP. 62-65. Fariba Farzaneh, John Wan-You-Sew,”Lighting Systems”, SCS 2830, Dec. 4th 2013. H. Kalhor, Technical Luminary, 2002. J. P. Frier, M.E.G Frier, industrial Lighting System, McGraw Hill, 1980.
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Kaveh Ahmediyan, Introduction to Luminous Design Rules, 2006.
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