In this scientific work, we present a developed design project for combined lighting of the youth centre co-working zone in the city of Milan (Italy), which, due to use of daylighting systems based on mirrored hollow tubular light guides, fully complies with the principles of sustainable architecture and comfortable environment, indicated in the requirements of the customer – the Milan city municipality. The paper proves that in terms of lighting parameters presented design project is not inferior to alternative projects that do not contain hollow tubular light guides and significantly surpasses them in energy saving and in the spectral effect on human circadian rhythms. The article shows a method, developed by the authors, for calculating the illumination of spaces with daylight, using lighting systems that include horizontally located mirrored light guides with bends, which allow calculating the illumination with a minimum correction from the actual measurement results. An exceptional feature of this work is the “light column” model, which not only fully illuminates the co-working area, but also contributes to the creation of cosiness and comfort in relaxation (temporary rest) sector of the co-working area. 1. Aizenberg, J. B., Buob, V., Zinger, R., Korobko, A., Pyatigorsky, V. System of combined lighting of a school building with solar and artificial light based on hollow light guides // Light & Engineering, 1996, # 8, pp. 8–18.
2. Ullah, I. December 2019. Heliostats daylighting system for multi-floor buildings // Journal of Daylighting, Volume 6, # 2, pp. 202–209.
3. Tszifen Sun, G. Lo, L. Li, Kai Tun, Yunpin Yan, Tszin Chjao. Use of a heliostat in internal solar lighting of large buildings // Environmental Sciences, Renewable energy sources, 2018.
4. Darula, S., Mohelníková, J., Král, J. Daylight in buildings based on tubular light guides // Journal of Building Engineering, December 2021, Volume 44, Article 102608.
5. Li, H., Wu, D., Yuan, Y., Zuo, L.. Evaluation methods of the daylight performance and potential energy saving of tubular daylight guide systems // Review. Indoor and Built Environment, 2021.
6. Simranjit Singh, Devendra Singh Bisht, Harry Garg. New method of manufacturing a daylight collector based on laser-cut panels in combination with a tubular light guide // Solar Energy, April 2021, Vol. 218, pp. 532–543.
7. Tsang, E.K.W., Kocifaj, M., Li, D.H.W., Kundracik, F., Mohelníková, J. August 2018. Straight light pipes’ daylighting: A case study for different climatic zones // Solar Energy, Volume 170, pp. 56–63.
8. Bisht, D.S., Singh, S., Sharma, K., Garg, H., Shravana Kumar R.R. Performance analysis of a passive tubular skylight using rectilinear parabolic-profile integrated with plane reflectors and wedge prism // July 2021, Solar Energy, Vol. 222, pp. 235–258.
9. Malet-Damour, B., Bigot, D., Guichard, S., Boyer, H. Photometrical analysis of mirrored light pipe: From state-of-the-art on experimental results (1990–2019) to the proposition of new experimental observations in high solar potential climates // Solar Energy, November 2019, Vol. 193, pp. 637–653.
10. Malet-Damour, B., Guichard, S., Bigot, D., Boyer, H. Study of tubular daylight guide systems in buildings: Experimentation, modelling and validation // Energy and Buildings, 2016, Vol. 129, pp. 308–321.
11. Giovanna Muscogiuri, Luigi Barrea, Marianna Scannapieco, Carolina Di Somma, Massimo Scacchi, Gianluca Aimaretti, Silvia Savastano, Annamaria Colao, Paolo Marzullo. Lullaby of the Sun: the role of vitamin D in sleep disorders // Sleep Medicine, February 2019, # 54, pp. 262–265.
12. Malet-Damour, B., Fakra, D.A.H. Thermal and spectral impact of building integrated Mirrored Light Pipe to human circadian rhythms and thermal environment // International Journal of Sustainable Energy, 2021.
13. Laouadi, A., Saber, H.H., Galasiu, A.D., Arsenault, C. Optical model for tubular hollow light guides // Science and Technology for the Built Environment, April 2013, Vol. 19, # 3, pp. 324–334.
14. Petrov, A., Kolchin, M. Design characteristics of a horizontal light tube construction considering requirements of lighting and thermal protection of enclosing structures // April 2021, 2nd International Scientific Conference on Socio-Technical Construction and Civil Engineering, STCCE2021, Kazan, Vol. 169, pp. 250–260.
15. Darula, S., Mohelníková, J., Král, J.. Daylight in buildings based on tubular light guides // December 2021, Journal of Building Engineering, Vol, 44.
16. Goharian, A., Mahdavinejad, M. A novel approach to multi-apertures and multi-aspects ratio light pipe // Journal of Daylighting, December 2020, Vol. 7, # 2, pp. 186–200.
17. Elsiana, F., Soehartono, F., Kristanto, L. Daylight performance of horizontal light pipe with egg-crate reflector in the tropics // IOP Conference Series: Earth and Environmental Science, June 2020, Vol. 490, #19, article number 012006, 3rd International Conference on Empathic Architecture, ICEA 2019 Surabaya, East Java.
18. Ovcharov, A.T., Selyanin, Yu.N. Technology Solatube ®: Prospective applications in Architecture and Building in Russia // Light & Engineering, 2016, Vol. 24, # 2, pp. 4–11.
19. Pleshkov, S. Yu., Bracale, G., Kuznetsov, A.L. Study of the acoustic properties of lighting systems based on hollow mirrored tubular light guides // Light & Engineering, 2021, Vol. 29, # 2, pp. 32–38.

• Previous article
• Next article

• co-working
• energy-efficient lighting systems based on mirrored hollow tubular light guides
• circadian rhythms