![](\"https:\/\/www.genatis.com\/wp-content\/uploads\/2024\/04\/Woippy4.png\" "\\"Woippy4\\"")
<\/span><\/div>Overall view of the building before construction.<\/p>\n<\/div><\/div><\/div>
![\"picto](\"https:\/\/www.genatis.com\/wp-content\/uploads\/2024\/02\/picto-bulles.png\" "\\"picto-bulles\\"")
<\/span><\/div>How can we improve thermal insulation and staff comfort ?<\/h2><\/div>Our case study on natural light<\/strong> concerns the renovation of a technical building. Located in the Moselle d\u00e9partement, it houses the mechanical workshop and vehicle repair and maintenance store of the d\u00e9partement’s technical services.<\/p>\nThe project involves total renovation of the roof,<\/strong> with the aim of improving thermal insulation and staff comfort<\/strong>. The client also specifically requested that the roof be flooded with natural light.<\/strong><\/p>\n<\/div>The natural lighting target for this study is set at 300 lux<\/strong> for 50% of the time<\/strong>, which is the minimum threshold recommended by European standard EN17037.<\/strong><\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div>Principe<\/h2><\/div>The most important indicator of a building’s ability to let in natural light is the daylight factor (DF)<\/strong>. It represents the ratio of natural light entering the building to the amount available outside.<\/p>\nIt depends solely on the orientation<\/strong> of the building and its openings. DF is therefore independent of location. Based on a site’s weather data, DF can be used to estimate natural light autonomy<\/strong> in relation to an illumination target. It represents the percentage of time during which the lighting target will be reached in the building.<\/p>\n<\/div>The usual DF values to aim for to achieve daylight autonomy are 1.5 to 2.5.<\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div>
![](\"https:\/\/www.genatis.com\/wp-content\/uploads\/2024\/03\/lumiere-img-01.jpg\" "\\"lumiere-img-01\\"")
<\/span><\/div><\/div><\/div><\/div><\/div>![](\"https:\/\/www.genatis.com\/wp-content\/uploads\/2024\/03\/Woippy3.png\" "\\"Woippy3\\"")
<\/span><\/div><\/div><\/div><\/span><\/div>Study<\/h2><\/div>To achieve the objective of natural lighting inside the building, our experts recommend the installation of :<\/p>\n
\n- 8 Bluevo\u00fbtes Therm<\/strong>, size 3×6 m<\/li>\n
- 1 Bluevo\u00fbte Therm<\/strong>, size 2×5 m<\/li>\n
- 3 Bluesteel Therm<\/strong>, size 1.3×1.3 m<\/li>\n<\/ul>\n
The light transmission of the roof-mounted units is 52%. Facade-mounted glazed units have a light transmission of 70%.<\/p>\n<\/div><\/div><\/div>
Simulation<\/h3><\/div>According to the recommendations<\/strong> and simulation results<\/strong>, natural light from the facades and roof will cover the entire space. The objective<\/strong> of 300 lux for 50% of the time will be largely achieved<\/strong>, over 95%<\/strong> of the surface area.<\/p>\n<\/div><\/div><\/div>![](\"https:\/\/www.genatis.com\/wp-content\/uploads\/2024\/04\/batiment-etude-lum-nat-400x339.png\" "\\"batiment-etude-lum-nat\\"")
<\/span><\/div><\/div><\/div>![](\"https:\/\/www.genatis.com\/wp-content\/uploads\/2024\/04\/repartitionFLJ-1-200x325.png\" "\\"repartitionFLJ\\"")
<\/span><\/div>86% average luminous autonomy achieved !<\/strong><\/p>\n<\/div>at 300 lux, over an 8 a.m.-6 p.m. time slot. In this configuration, users will only need to use artificial lighting 14% of the time! Significant energy savings and a substantial improvement in working conditions.<\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div>
\n\n\n\n\nLocation<\/td>\n<\/tr>\n \nLongitude<\/td>\n 0.6\u00b0<\/td>\n<\/tr>\n \nLatitude<\/td>\n 44.2\u00b0<\/td>\n<\/tr>\n \nCurrent sun position<\/td>\n<\/tr>\n \nElevation<\/td>\n 37\u00b0<\/td>\n<\/tr>\n \nAzimut<\/td>\n 13.6\u00b0<\/td>\n<\/tr>\n \nNatural lighting<\/td>\n<\/tr>\n \nSky type :<\/td>\n CIE type 16<\/td>\n<\/tr>\n \nDirect available illuminance :<\/td>\n 34 059 lux<\/td>\n<\/tr>\n \nAvailable diffuse illuminance :<\/td>\n 25 175 lux<\/td>\n<\/tr>\n \nMinimum illuminance :<\/td>\n 747 lux<\/td>\n<\/tr>\n \nAverage received illuminance :<\/td>\n 3061 lux<\/td>\n<\/tr>\n \nMaximum received illuminance :<\/td>\n 22 824 lux<\/td>\n<\/tr>\n \nDF minimum :<\/td>\n 1,8%<\/td>\n<\/tr>\n \nDF medium :<\/td>\n 6,0%<\/td>\n<\/tr>\n \nDF maximum :<\/td>\n 27,2%<\/td>\n<\/tr>\n \nSurface area ratio meeting the requirement :<\/td>\n 100%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div><\/div><\/div><\/div>Result after work<\/h2><\/div>Several months after completion of the work, the feedback is very positive.
\nThe recommendations of our lighting study have been respected, eliminating the need for artificial lighting for most of the day. In addition, an extra Bluevo\u00fbte has been installed in the darker location to achieve a better distribution of natural light in this area.
\nFinally, the total re-roofing combined with the thermal performance of the installed vaults greatly improved the building’s thermal comfort.<\/p>\n<\/div><\/div><\/div>
![\"\"](\"https:\/\/www.genatis.com\/wp-content\/uploads\/2024\/04\/IMG_7456-scaled.jpg\")
<\/div><\/div><\/div>![\"\"](\"https:\/\/www.genatis.com\/wp-content\/uploads\/2024\/04\/IMG_7395-scaled.jpg\")
<\/div><\/div><\/div>![\"\"](\"https:\/\/www.genatis.com\/wp-content\/uploads\/2024\/04\/IMG_7453-scaled.jpg\")
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Our case study on natural light<\/strong> concerns the renovation of a technical building. Located in the Moselle d\u00e9partement, it houses the mechanical workshop and vehicle repair and maintenance store of the d\u00e9partement’s technical services.<\/p>\n The project involves total renovation of the roof,<\/strong> with the aim of improving thermal insulation and staff comfort<\/strong>. The client also specifically requested that the roof be flooded with natural light.<\/strong><\/p>\n<\/div> The natural lighting target for this study is set at 300 lux<\/strong> for 50% of the time<\/strong>, which is the minimum threshold recommended by European standard EN17037.<\/strong><\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div> The most important indicator of a building’s ability to let in natural light is the daylight factor (DF)<\/strong>. It represents the ratio of natural light entering the building to the amount available outside.<\/p>\n It depends solely on the orientation<\/strong> of the building and its openings. DF is therefore independent of location. Based on a site’s weather data, DF can be used to estimate natural light autonomy<\/strong> in relation to an illumination target. It represents the percentage of time during which the lighting target will be reached in the building.<\/p>\n<\/div> The usual DF values to aim for to achieve daylight autonomy are 1.5 to 2.5.<\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div> To achieve the objective of natural lighting inside the building, our experts recommend the installation of :<\/p>\n The light transmission of the roof-mounted units is 52%. Facade-mounted glazed units have a light transmission of 70%.<\/p>\n<\/div><\/div><\/div> According to the recommendations<\/strong> and simulation results<\/strong>, natural light from the facades and roof will cover the entire space. The objective<\/strong> of 300 lux for 50% of the time will be largely achieved<\/strong>, over 95%<\/strong> of the surface area.<\/p>\n<\/div><\/div><\/div> 86% average luminous autonomy achieved !<\/strong><\/p>\n<\/div> at 300 lux, over an 8 a.m.-6 p.m. time slot. In this configuration, users will only need to use artificial lighting 14% of the time! Significant energy savings and a substantial improvement in working conditions.<\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div> Several months after completion of the work, the feedback is very positive.Principe<\/h2><\/div>
<\/span><\/div><\/div><\/div><\/div><\/div><\/span><\/div><\/div><\/div><\/span><\/div>Study<\/h2><\/div>
\n
Simulation<\/h3><\/div>
<\/span><\/div><\/div><\/div><\/span><\/div>\n\n
\n Location<\/td>\n<\/tr>\n \n Longitude<\/td>\n 0.6\u00b0<\/td>\n<\/tr>\n \n Latitude<\/td>\n 44.2\u00b0<\/td>\n<\/tr>\n \n Current sun position<\/td>\n<\/tr>\n \n Elevation<\/td>\n 37\u00b0<\/td>\n<\/tr>\n \n Azimut<\/td>\n 13.6\u00b0<\/td>\n<\/tr>\n \n Natural lighting<\/td>\n<\/tr>\n \n Sky type :<\/td>\n CIE type 16<\/td>\n<\/tr>\n \n Direct available illuminance :<\/td>\n 34 059 lux<\/td>\n<\/tr>\n \n Available diffuse illuminance :<\/td>\n 25 175 lux<\/td>\n<\/tr>\n \n Minimum illuminance :<\/td>\n 747 lux<\/td>\n<\/tr>\n \n Average received illuminance :<\/td>\n 3061 lux<\/td>\n<\/tr>\n \n Maximum received illuminance :<\/td>\n 22 824 lux<\/td>\n<\/tr>\n \n DF minimum :<\/td>\n 1,8%<\/td>\n<\/tr>\n \n DF medium :<\/td>\n 6,0%<\/td>\n<\/tr>\n \n DF maximum :<\/td>\n 27,2%<\/td>\n<\/tr>\n \n Surface area ratio meeting the requirement :<\/td>\n 100%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div><\/div><\/div><\/div> Result after work<\/h2><\/div>
\nThe recommendations of our lighting study have been respected, eliminating the need for artificial lighting for most of the day. In addition, an extra Bluevo\u00fbte has been installed in the darker location to achieve a better distribution of natural light in this area.
\nFinally, the total re-roofing combined with the thermal performance of the installed vaults greatly improved the building’s thermal comfort.<\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div>