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H Juslén 19. Moore, T., Carter, D.J., Slater, A., (2003) Long-term patterns of use of occupant controlled office lighting. Lighting Research and TTechnology. 35,1, 43-59 20. Newman, L.A., Walker, M.T., Brown, R.L., Cronin, T.W., Robinson, P.R., (2003) Melanopsin forms a functional short- wavelength photo pigment. Biochemistry. 42(44): 12734-12738 21. Panda, S., Nayak, S.K., Campo, B., Walker, J.R., Hogenesch, J.B., Jegla, T., (2005) Illumination of the melanopsin signalling pathway. Science 28(5709): 600-604 22. Partonen, T., Lönngvist, J., (2000) Bright light improves vitality and alleviates distress in healthy people. Journal of Affective Disorders 57: 55-61 23. Scheer, F.A.J.L. and Buijs, R.M., (1999) Light affects morning salivary cortisol in humans. J Clin Endocrinol Metab 84: 3395-3398 24. Qiu, X., Kumbalasin, T., Carlson, S.M., Wong, K.Y., Krishna, V., Provencio, I. and Berson, D.M., (2005) Induction of photosensitivity by heterologous expression of melanopsin. Nature 433(7027): 745-749 36 Henri JUSLÉN Philips Oy, Luminaires P.O Box 4 (Mattilantie 75) FI- 04601 Mäntsälä Tel: +358 (0)19 6892309 Mobile: +358 50 5124140 Fax: +358 (0)19 6883231 henri.juslen@philips.com Henri Juslén works as an R&D manager in the Philips luminaires factory in Finland. He is a post-graduate student of Helsinki university of technology and his main study area has been workplace lighting, especially in industry. Received 16 November 2006 Revised 19 February 2007 INGINERIA ILUMINATULUI 18-2006 Reviewers: Dr. David CARTER, Prof. Liisa HALONEN, Prof. Janos SCHANDA
APPROACH ON NUMERICAL MODELLING OF BRANCHED DAYLIGHT GUIDING SYSTEMS Cosmin ŢICLEANU Technical University of Constructions of Bucharest Among the numerous daylighting strategies, there are only few of them bringing natural light within deep spaces inside buildings and even fewer being capable of guiding daylight to blind spaces having no connection to the outside. There has been a continuous challenge in increasing the efficiency of such daylight guiding techniques; however, because of the light losses, it is still difficult to build branched light pipes that should lit different interior spaces using daylight from a main supplying duct. This paper shows the results of such an experiment, based on natural lighting systems using a 98% reflectance pure silver based aluminium, which makes promising any initiative in constructing a branched daylighting system. Keywords: daylight guiding system, branched pipe system, numerical model. 1. Introduction The light-pipe is a secondary light source that transmits light from the primary (natural or artificial) source within interior spaces, to a specific target or on specific reflecting or transmitting surfaces [1]. Light transmission is done at the end of the light-pipe, where light is distributed and directed depending on task particularities, or by side transfer towards specific targets. Light-pipes transmit light radiation through total internal reflection. The light-pipe is perhaps the most technologically exciting of innovative daylighting systems because of the long distances over which it can operate. In principle, light-pipes collect, direct, and channel daylight into virtually any area of a INGINERIA ILUMINATULUI 18-2006 building. The system consists of three main components: heliostat or light dome (collecting and concentrating unit), transport system (reflective conducts) and emitter (distributing light into the targeted space). The use of light-pipes can increase energy savings, but generally system efficiency is low because of light losses within ramification or direction changing [8]. There are specific light-pipe systems for roof applications, known as solar tubes. These systems maximize the concept of renewable energy by reflecting and intensifying sunlight and even normal daylight, down through a highly reflective silver mirror-finish aluminium tube. As compared to heliostat collecting units, the solar tubes have the advantage of collecting sunlight and skylight by fixed domes. These
Page 2 and 3: Editorial Board Florin POP, Profess
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Page 13 and 14: 4. Results after the first year of
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Page 43 and 44: Tests carried out by the BRE (Build
Page 45 and 46: where NP is the number of parameter
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Page 67 and 68: 2 The features of the ALADIN protot
Page 69 and 70: Graphical interface Psiho phisiolog

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