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An Approach for Lighting Calculations in Indoor Mirrored Facilities Based on Virtual Twin-Spaces

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  • Antonio Peña-García

    (Department of Civil Engineering, University of Granada, 18071 Granada, Spain
    Research Group “Lighting Technology for Safety and Sustainability”, University of Granada, 18071 Granada, Spain)

Abstract

The presence of walls with different reflectance in indoor facilities is a problem when designing their lighting installations. This problem becomes more serious when one or more walls are mirrors, a common situation in medical, sport, educative and many other indoor facilities. Even if some programs can work with different approaches, the results are far from exact and, in many cases, designers ignore the mirrors and work by eye, with results that are frequently excessive in terms of illuminance on the working planes, glare and energy consumption and use of materials. These deviations from the intended results are due to the direct or indirect estimation of reflectance remarkably lower than 1 in the mirrored walls. In this framework of uncertainty, this work is presented with the objective of developing an intuitive theoretical model based on the consideration of virtual twin-spaces behind the mirrors. This proposal is not just an approach, but a useful tool providing the input for any kind of calculation ranging from the lumen method, used in quick pre-dimensioning, to the most complete calculations with computational methods. In addition, apart from calculating the number of luminaires and photometric parameters, the use of virtual twin-rooms also takes into account the extended field of vision of the users, including objects behind, and virtual luminaries. This advantage has no precedent in the literature up to date.

Suggested Citation

  • Antonio Peña-García, 2022. "An Approach for Lighting Calculations in Indoor Mirrored Facilities Based on Virtual Twin-Spaces," Sustainability, MDPI, vol. 14(19), pages 1-10, September.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:19:p:11837-:d:919989
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    References listed on IDEAS

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    1. Raquel Amorim & Juan Carlos López & Valentín Molina-Moreno & Antonio Peña-García, 2017. "Use of Natural Light vs. Cold LED Lighting in Installations for the Recovery of Victims of Gender Violence: Impact on Energy Consumption and Victims’ Recovery," Sustainability, MDPI, vol. 9(4), pages 1-9, April.
    2. Vincenzo Costanzo & Gianpiero Evola & Luigi Marletta & Fabiana Pistone Nascone, 2018. "Application of Climate Based Daylight Modelling to the Refurbishment of a School Building in Sicily," Sustainability, MDPI, vol. 10(8), pages 1-19, July.
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